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The Journal of Clinical Endocrinology & Metabolism Vol. 86, No. 5 1930-1935
Copyright © 2001 by The Endocrine Society


Original Studies

Hypoadiponectinemia in Obesity and Type 2 Diabetes: Close Association with Insulin Resistance and Hyperinsulinemia

Christian Weyer, Tohru Funahashi, Sachiyo Tanaka, Kikuko Hotta, Yuji Matsuzawa, Richard E. Pratley and P. Antonio Tataranni

Clinical Diabetes and Nutrition Section (C.W., R.E.P., P.A.T.), National Institutes of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Phoenix, Arizona 85016; and Department of Internal Medicine and Molecular Science (T.F., S.T., K.H., Y.M.), Graduate School of Medicine, Osaka University, Osaka, Japan

Address all correspondence and requests for reprints to: Christian Weyer, M.D., Clinical Diabetes and Nutrition Section, National Institutes of Health, 4212 North 16th Street, Room 5-41, Phoenix, Arizona 85016. E-mail: cweyer{at}phx.niddk.nih.gov


    Abstract
 Top
 Abstract
 Introduction
 Subjects and Methods
 Results
 Discussion
 References
 
Plasma concentrations of adiponectin, a novel adipose-specific protein with putative antiatherogenic and antiinflammatory effects, were found to be decreased in Japanese individuals with obesity, type 2 diabetes, and cardiovascular disease, conditions commonly associated with insulin resistance and hyperinsulinemia.

To further characterize the relationship between adiponectinemia and adiposity, insulin sensitivity, insulinemia, and glucose tolerance, we measured plasma adiponectin concentrations, body composition (dual-energy x-ray absorptiometry), insulin sensitivity (M, hyperinsulinemic clamp), and glucose tolerance (75-g oral glucose tolerance test) in 23 Caucasians and 121 Pima Indians, a population with a high propensity for obesity and type 2 diabetes.

Plasma adiponectin concentration was negatively correlated with percent body fat (r = -0.43), waist-to-thigh ratio (r = -0.46), fasting plasma insulin concentration (r = -0.63), and 2-h glucose concentration (r = -0.38), and positively correlated with M (r = 0.59) (all P < 0.001); all relations were evident in both ethnic groups. In a multivariate analysis, fasting plasma insulin concentration, M, and waist-to-thigh ratio, but not percent body fat or 2-h glucose concentration, were significant independent determinates of adiponectinemia, explaining 47% of the variance (r2 = 0.47). Differences in adiponectinemia between Pima Indians and Caucasians (7.2 ± 2.6 vs. 10.2 ± 4.3 µg/ml, P < 0.0001) and between Pima Indians with normal, impaired, and diabetic glucose tolerance (7.5 ± 2.7, 6.1 ± 2.0, 5.5 ± 1.6 µg/ml, P < 0.0001) remained significant after adjustment for adiposity, but not after additional adjustment for M or fasting insulin concentration.

These results confirm that obesity and type 2 diabetes are associated with low plasma adiponectin concentrations in different ethnic groups and indicate that the degree of hypoadiponectinemia is more closely related to the degree of insulin resistance and hyperinsulinemia than to the degree of adiposity and glucose intolerance.


    Introduction
 Top
 Abstract
 Introduction
 Subjects and Methods
 Results
 Discussion
 References
 
OBESITY IS COMMONLY associated with insulin resistance and hyperinsulinemia (1) and is a major risk factor for the development of type 2 diabetes and cardiovascular disease (2). Although adipose tissue is now known to express and secrete a variety of metabolites, hormones, and cytokines that have been implicated in the development of insulin resistance and atherosclerosis (3, 4), the molecular basis for the link between obesity, diabetes, and cardiovascular disease remains poorly understood. While free-fatty acids released from adipose tissue have long been implicated in the development of these obesity-related complications (5), there is growing evidence that adipocyte-derived cytokines such as tumor necrosis factor-{alpha} (TNF{alpha}) (6, 7), plasminogen activator inhibitor type 1 (8), interleukin 6 (9, 10), and complement C3 (11) may also have a role. This is in part based on experimental evidence that these adipocytokines have direct effects on the insulin signaling cascade (TNF{alpha}) (7), the fibrinolytic system (plasminogen activator inhibitor type 1) (8), and endothelial cell adhesion (interleukin 6) (9). Furthermore, clinical studies have shown that the plasma concentrations of several of these adipocytokines correlate with measures of adiposity, insulin sensitivity, and endothelial function in humans (8, 9, 10, 11).

More recently, a novel adipose-specific protein, adiponectin, has been discovered (12, 13, 14, 15). Adiponectin, the gene product of the adipose most abundant gene transcript-1 (apM1) gene which is exclusively and abundantly expressed in white adipose tissue, is a 244-amino acid protein with high structural homology to collagen VIII, X, and complement C1q (12, 13, 14, 15) as well as TNF{alpha} (16). Although the physiological role of adiponectin is yet to be fully determined, experimental findings that this protein accumulates in injured vessel walls (17) and dose-dependently inhibits TNF{alpha}-induced cell adhesion in human aortic endothelial cells (18, 19), have led to the proposal that adiponectin may have an antiatherogenic effect. Moreover, adiponectin has recently been reported to have an inhibitory effect on the proliferation of myelomonocytic progenitors as well as on phagocytic activity and TNF{alpha} production by macrophages (20), findings consistent with an antiinflammatory effect of this protein. Finally, recent findings of markedly reduced adipose tissue apM1 gene expression in ob/ob mice (14) and in obese Caucasians with type 2 diabetes (21) has led to the hypothesis that adiponectin may have a role in the pathogenesis of obesity and type 2 diabetes (21). Using an adiponectin-specific enzyme-linked immunosorbent assay, Arita et al. (22) have demonstrated that adiponectin is abundant in the circulation in humans, with plasma levels in the microgram per ml range, thus accounting for approximately 0.01% of total plasma protein. In contrast to all other adipocytokines known to date, plasma adiponectin concentrations were found to be decreased, not increased, in Japanese individuals with obesity (22), type 2 diabetes (23), and cardiovascular disease (18, 23), conditions commonly associated with insulin resistance and hyperinsulinemia.

To gain further insights into the anthropometric and metabolic determinants of adiponectinemia in humans, it would be useful to examine the relationship between the plasma adiponectin concentration and direct measures of adiposity, body fat distribution, insulin sensitivity, insulinemia, and glucose tolerance. Moreover, comparative studies of adiponectinemia in populations with different propensity for obesity, insulin resistance, type 2 diabetes, and atherosclerosis are warranted. The Pima Indians of Arizona are interesting in this respect, because they have among the highest reported prevalence rates of obesity, insulin resistance, and type 2 diabetes in the world (24, 25), but a relatively low incidence of cardiovascular disease (26).

In the present study, we examined the relationship between the plasma adiponectin concentration and adiposity, body fat distribution, insulin sensitivity, insulinemia, and glucose tolerance in a large group of Pima Indians and Caucasians covering a wide range of glucose tolerance.


    Subjects and Methods
 Top
 Abstract
 Introduction
 Subjects and Methods
 Results
 Discussion
 References
 
A total of 144 subjects (23 Caucasians and 121 Pima Indians; Table 1Go) who had participated in ongoing studies of the pathogenesis of obesity and type 2 diabetes (27, 28) and of whom frozen plasma samples had been stored were included in this analysis. All subjects were between 18 and 50 yr of age, nonsmokers at the time of the study, and, except for type 2 diabetes in 17 Pima Indians, healthy according to a physical examination and routine laboratory tests. No subject had clinical or laboratory signs of acute infection and none had a history of, or presence of, clinically evident cardiovascular disease. Subjects were admitted for 8–10 days to the NIH Clinical Research Unit in Phoenix, Arizona, where they were fed a weight-maintaining diet (50% of calories as carbohydrate, 30% as fat, and 20% as protein) and abstained from strenuous exercise. After at least 3 days on the diet, subjects underwent a series of tests for the assessment of body composition, glucose tolerance, and insulin sensitivity. The protocol was approved by the Tribal Council of the Gila River Indian Community and by the Institutional Review Board of the National Institute of Diabetes and Digestive and Kidney Diseases and all subjects provided written informed consent before participation.


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Table 1. Physical and metabolic characteristics of the study population (mean ± SD)

 
Anthropometric measurements

Body composition was estimated by total body dual energy x-ray absorptiometry (DPX-L; Lunar Corp., Madison, WI) with calculation of percent body fat, fat mass, and fat-free mass as described (29). Waist and thigh circumferences were measured at the level of umbilicus and the gluteal fold in the supine and standing position, respectively, and the waist-to-thigh ratio was calculated as an index of body fat distribution.

Oral glucose tolerance test (OGTT) and analytic procedures

After a 12-h overnight fast, subjects underwent a 75-g OGTT (30). Baseline blood samples were drawn for determination of the fasting plasma glucose, insulin, and adiponectin concentrations. Plasma glucose concentrations were determined by the glucose oxidase method (Beckman Coulter, Inc. Instruments, Fullerton, CA) and were also measured at 2 h after glucose ingestion for assessment of glucose tolerance according to the 1985 WHO diagnostic criteria (30). Plasma insulin concentrations were determined by an automated immunoassay (Access; Beckman Coulter, Inc.). The fasting plasma insulin concentration from the OGTT was averaged with two additional fasting plasma insulin concentrations determined on separate days during the same admission to obtain a more robust measure of fasting insulinemia. Blood samples for measurement of fasting plasma adiponectin concentrations were drawn with prechilled syringes, transferred into prechilled EDTA tubes, and immediately placed on ice. All tubes were cold-centrifuged (+4 C) within several minutes of collection and stored at -70 C until assay at the Department of Internal Medicine and Molecular Sciences, Osaka University (Osaka, Japan). Fasting plasma adiponectin concentrations were determined using a validated sandwich enzyme-linked immunosorbent assay employing an adiponectin-specific antibody (intraassay and interassay coefficients of variation 3.3% and 7.4%, respectively) (16, 21, 22).

Two-step hyperinsulinemic euglycemic glucose clamp

Insulin sensitivity was assessed at physiologic and supraphysiologic insulin concentrations during a two-step hyperinsulinemic euglycemic glucose clamp as described (27, 28). In brief, after an overnight fast, a primed continuous iv insulin infusion was administered for 100 min at a constant rate of 240 nmol/m2 body surface area per minute (low dose), followed by a second 100-min infusion at a rate of 2,400 nmol/m2·min (high dose). These infusions achieved steady-state plasma insulin concentrations of 840 ± 4,252 pmol/L and 13,320 ± 3,480 pmol/L (mean ± SD), respectively. Plasma glucose concentrations were maintained at approximately 5.5 mmol/L with a variable infusion of a 20% glucose solution. The rate of total insulin-stimulated glucose disposal (M) was calculated for the last 40 min of the low-dose (M-low) and high-dose (M-high) insulin infusion. As described previously (27, 28), M-low was corrected for the rate of endogenous glucose output [measured by a primed (30 µCi), continuous (0.3 µCi/min) 3-3H-glucose infusion, Refs. 27 and 28 ] and adjusted for the steady-state plasma glucose and insulin concentrations. M-low and M-high were normalized to estimated metabolic body size (EMBS = fat-free mass + 17.7 kg) (27, 28). Five of the 23 Caucasian subjects had no assessment of insulin sensitivity.

Statistical analyses

Statistical analyses were performed using the software of the SAS Institute, Inc. (Cary, NC). M-low and the fasting plasma insulin and adiponectin concentrations were all log-transformed to achieve a more normal distribution. General linear regression models with adjustment for age and sex were used to compare anthropometric and metabolic characteristics between Caucasians and Pima Indians and between subjects with normal glucose tolerance (NGT), impaired glucose tolerance (IGT), and diabetes.

Adiponectinemia in relation to anthropometric and metabolic variables in nondiabetic Caucasians and Pima Indians

In a first analysis, we examined the relationship of the plasma adiponectin concentration to selected anthropometric and metabolic variables in Caucasians and Pima Indians carefully matched for body mass index (BMI) and glucose tolerance. Because no samples of diabetic Caucasians were available and to control for the confounding effect of frank hyperglycemia, results from the 17 diabetic Pima Indians were excluded from this analysis. Univariate linear regression models were used to examine the simple relationships of adiponectin to selected variables. Stepwise and general multivariate regression analyses were used to identify independent determinants of adiponectin and the percentage of variance in adiponectin that they explained (r2).

Adiponectinemia in Pima Indians with NGT, IGT, and diabetes

In a second analysis, we compared the mean plasma adiponectin concentration between Pima Indians with NGT, IGT, and diabetes. General linear regression models with computation of least square means were used to compare the mean plasma adiponectin concentration between the three glucose tolerance groups after adjustment for covariates.


    Results
 Top
 Abstract
 Introduction
 Subjects and Methods
 Results
 Discussion
 References
 
As shown in Table 1Go, subjects covered a wide range of body size and composition, glucose tolerance, and insulin sensitivity. Despite having similar BMI and glucose tolerance, nondiabetic Pima Indians had a higher waist-to-thigh ratio and were markedly more insulin resistant and hyperinsulinemic than nondiabetic Caucasians. As expected, Pima Indians with IGT and diabetes were more obese, hyperinsulinemic, and insulin resistant than those with NGT (Table 1Go).

Adiponectinemia in relation to anthropometric and metabolic variables in nondiabetic Caucasians and Pima Indians

Figure 1Go and Table 2Go show the simple relationships between the plasma adiponectin concentration and selected anthropometric and metabolic variables for the entire study population (Fig. 1Go) and separately for the two ethnic groups (Table 2Go). The plasma adiponectin concentration was negatively correlated with BMI, percent body fat, waist-to-thigh ratio, and the fasting plasma insulin and 2-h plasma glucose concentrations in both Caucasians and Pima Indians (Fig. 1Go, A and B, and Table 2Go). In contrast, plasma adiponectin concentration was positively correlated with M-low and M-high (Fig. 1Go, C and D, and TableGo 2). In a multivariate analysis, the fasting plasma insulin concentration, M-low, and waist-to-thigh ratio, but not percent body fat or the 2-h glucose concentration, were significant independent determinants of the plasma adiponectin concentration, explaining a total of 47% of the variance in this measure (r2 = 0.47). The mean plasma adiponectin concentration was lower in Pima Indians than in Caucasians, a difference that remained significant after adjustment for percent body fat, but not after additional adjustment for M and/or the fasting plasma insulin concentration (Fig. 1EGo). Although females had higher percent body fat than males (39% vs. 27%, P < 0.001), adiponectin levels did not differ between females (6.9 µg/ml) and males (7.7 µg/ml) (P = 0.98 and P = 0.54 with and without adjustment for the aforementioned determinants).



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Figure 1. Fasting plasma adiponectin concentration in relation to percent body fat (A), fasting insulinemia (B), and insulin-stimulated glucose disposal (M) as assessed under physiological (C) and supraphysiological (D) levels of hyperinsulinemia in nondiabetic Pima Indians ({circ}) and Caucasians (•). E, Mean fasting plasma adiponectin concentration in nondiabetic Pima Indians vs. Caucasians with and without adjustment for age, sex, percent body fat, and/or insulin sensitivity. To convert adiponectin concentrations to micromoles per L, divide by 30.

 

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Table 2. Relationship between adiponectin and selected anthropometric and metabolic variables by ethnic group

 
Adiponectinemia in Pima Indians with NGT, IGT, and diabetes

The plasma adiponectin concentration was negatively correlated with the 2-h plasma glucose concentration (Fig. 2AGo) and accordingly, was lower not only in individuals with diabetes, but also, to a similar extent, in individuals with IGT compared with those with NGT (Fig. 2BGo). As with the ethnic comparison, differences in mean plasma adiponectin concentration between glucose tolerance groups remained significant after adjustment for percent body fat, but not after additional adjustment for M and/or the fasting plasma insulin concentration (Fig. 2BGo).



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Figure 2. A, Fasting plasma adiponectin concentration in relation to 2-h glucose concentration in Pima Indians with NGT ({circ}), IGT (), or diabetes (•). B, Mean fasting plasma adiponectin concentration in Pima Indians with NGT, IGT, and diabetes (DIA) with and without adjustment for age, sex, percent body fat and/or insulin sensitivity. To convert adiponectin concentrations to micromoles per L, divide by 30.

 

    Discussion
 Top
 Abstract
 Introduction
 Subjects and Methods
 Results
 Discussion
 References
 
The present study revealed two important findings. First, it confirmed previous findings that obesity and type 2 diabetes are associated with low plasma adiponectin concentrations and indicated that this hypoadiponectinemia is evident across different ethnic groups with marked differences in the propensity for obesity, type 2 diabetes, and atherosclerosis. Second, the results show that the plasma adiponectin concentration is more closely related to insulin sensitivity and fasting insulinemia than to adiposity and glycemia, which suggests that the hypoadiponectinemia in people with obesity and type 2 diabetes is in large part attributable to insulin resistance and/or hyperinsulinemia.

Previous studies in Japanese individuals have shown that the plasma adiponectin concentration is negatively correlated with body mass index (BMI) and accordingly, lower in obese than in lean subjects (18, 22, 23). The present results extend this finding by demonstrating that plasma adiponectin concentrations are inversely related to percent body fat, a direct measure of adiposity, and that this is consistent across different ethnic groups. Our results thus confirm that adiponectin is the only adipose-specific protein known to date that, despite its exclusive production in white adipose tissue, is negatively regulated in obesity. This agrees with findings in rodents where the murine homologue of adiponectin, adipoQ, is also down-regulated in obesity (14) and with a recent report of decreased apM1 gene expression in sc and visceral adipose tissue of obese humans (21).

We also found that the mean plasma adiponectin concentration was lower in nondiabetic Pima Indians than in Caucasians and in subjects with IGT and diabetes compared with those with NGT. The fact that these differences were not explained by differences in percent body fat indicates that factors other than adiposity must play a role in determining adiponectinemia. Our finding that the plasma adiponectin concentration was more closely related to fasting insulinemia and to the rate of insulin-stimulated glucose disposal, a direct measure of insulin sensitivity, than to percent body fat and the 2-h glucose concentration suggested that hyperinsulinemia and/or insulin resistance might be major determinants of the hypoadiponectinemia in obesity and type 2 diabetes. This was supported by the finding that differences in adiponectinemia between Pima Indians and Caucasians and between glucose tolerance groups were almost completely explained by differences in insulin sensitivity and/or fasting insulinemia, but not by differences in percent body fat.

The mechanism underlying the observed close association between plasma adiponectin concentration and insulin sensitivity/insulinemia are presently unknown. A direct effect of hyperinsulinemia to down-regulate apM1 gene expression in adipose tissue is an unlikely explanation, given that insulin appears to up-regulate apM1 in rodents (13, 14) and that plasma adiponectin concentrations do not decrease postprandially in humans (23). Interestingly, two recent genomic scan studies have independently revealed linkage of insulinemia to a region on chromosome 3 that harbors the apM1 gene (28, 31). Studies of the regulation of adiponectin gene expression are now warranted.

Although there is currently no experimental evidence to support this, it is at least possible that adiponectin itself may affect insulin sensitivity and/or insulinemia. For instance, adiponectin has recently been shown to inhibit both the production (in macrophages) and action (in endothelial cells) of TNF{alpha} (18, 20), a cytokine which has direct effects on the insulin signaling cascade and has long been implicated as a possible link between obesity and insulin resistance/hyperinsulinemia (6, 7). Alternatively, it has been suggested (14) that adiponectin, which also shares striking structural homology to collagens VII and X and is thus assumed to be a matrix-forming protein, may affect intermediate metabolism by forming matrixes in the interstitium of different tissues. Clearly, experimental studies of the in vitro and in vivo effects of adiponectin on insulin signaling and glucose metabolism are needed to establish the role of adiponectin, if any, as a molecular link between obesity, insulin resistance, hyperinsulinemia, type-2 diabetes, and atherosclerosis.


    Acknowledgments
 
We gratefully acknowledge the help of the nursing staff and of Dr. Arline Salbe and the dietary staff for the care of the volunteers. We also thank the technical staff of the NIH Clinical Diabetes and Nutrition Section in Phoenix and of the Department of Internal Medicine and Molecular Sciences, Osaka University, Japan, for assisting in the laboratory analyses. Finally, we are grateful to the members and leaders of the Gila River Indian Community for their continuing cooperation in our studies.

Received November 20, 2000.

Revised January 11, 2001.

Accepted January 24, 2001.


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 Abstract
 Introduction
 Subjects and Methods
 Results
 Discussion
 References
 

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Am. J. Physiol. Endocrinol. Metab.Home page
S. A. Phillips, J. Kung, T. P. Ciaraldi, C. Choe, L. Christiansen, S. Mudaliar, and R. R. Henry
Selective regulation of cellular and secreted multimeric adiponectin by antidiabetic therapies in humans
Am J Physiol Endocrinol Metab, September 1, 2009; 297(3): E767 - E773.
[Abstract] [Full Text] [PDF]


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J EndocrinolHome page
K. Ishizawa, N. Dorjsuren, Y. Izawa-Ishizawa, R. Sugimoto, Y. Ikeda, Y. Kihira, K. Kawazoe, S. Tomita, K. Tsuchiya, K. Minakuchi, et al.
Inhibitory effects of adiponectin on platelet-derived growth factor-induced mesangial cell migration
J. Endocrinol., August 1, 2009; 202(2): 309 - 316.
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J. Clin. Endocrinol. Metab.Home page
I. Kanazawa, T. Yamaguchi, M. Yamauchi, M. Yamamoto, S. Kurioka, S. Yano, and T. Sugimoto
Adiponectin Is Associated with Changes in Bone Markers during Glycemic Control in Type 2 Diabetes Mellitus
J. Clin. Endocrinol. Metab., August 1, 2009; 94(8): 3031 - 3037.
[Abstract] [Full Text] [PDF]


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JAMAHome page
S. Li, H. J. Shin, E. L. Ding, and R. M. van Dam
Adiponectin Levels and Risk of Type 2 Diabetes: A Systematic Review and Meta-analysis
JAMA, July 8, 2009; 302(2): 179 - 188.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
F Bonnet, B Balkau, J M Malecot, P Picard, C Lange, F Fumeron, R Aubert, V Raverot, H Dechaud, J Tichet, et al.
Sex hormone-binding globulin predicts the incidence of hyperglycemia in women: interactions with adiponectin levels
Eur. J. Endocrinol., July 1, 2009; 161(1): 81 - 85.
[Abstract] [Full Text] [PDF]


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J Am Coll CardiolHome page
L. C. Costello-Boerrigter and J. C. Burnett Jr
A new role for the natriuretic peptides metabolic regulators of the adipocyte.
J. Am. Coll. Cardiol., June 2, 2009; 53(22): 2078 - 2079.
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J. Nutr.Home page
A. Bumrungpert, R. W. Kalpravidh, C. Chitchumroonchokchai, C.-C. Chuang, T. West, A. Kennedy, and M. McIntosh
Xanthones from Mangosteen Prevent Lipopolysaccharide-Mediated Inflammation and Insulin Resistance in Primary Cultures of Human Adipocytes
J. Nutr., June 1, 2009; 139(6): 1185 - 1191.
[Abstract] [Full Text] [PDF]


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Hum Reprod UpdateHome page
K.A. Toulis, D.G. Goulis, D. Farmakiotis, N.A. Georgopoulos, I. Katsikis, B.C. Tarlatzis, I. Papadimas, and D. Panidis
Adiponectin levels in women with polycystic ovary syndrome: a systematic review and a meta-analysis
Hum. Reprod. Update, May 1, 2009; 15(3): 297 - 307.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
Z. Kovacova, M. Vitkova, M. Kovacikova, E. Klimcakova, M. Bajzova, Z. Hnevkovska, L. Rossmeislova, V. Stich, D. Langin, and J. Polak
Secretion of adiponectin multimeric complexes from adipose tissue explants is not modified by very low calorie diet
Eur. J. Endocrinol., April 1, 2009; 160(4): 585 - 592.
[Abstract] [Full Text] [PDF]


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The Journal of RheumatologyHome page
C. POPA, M. G. NETEA, J. de GRAAF, F. H.J. van den HOOGEN, T. R.D.J. RADSTAKE, H. TOENHAKE-DIJKSTRA, P. L.C.M. van RIEL, J. W.M. van der MEER, A. F.H. STALENHOEF, and P. BARRERA
Circulating Leptin and Adiponectin Concentrations During Tumor Necrosis Factor Blockade in Patients with Active Rheumatoid Arthritis
J Rheumatol, April 1, 2009; 36(4): 724 - 730.
[Abstract] [Full Text] [PDF]


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Diabetes CareHome page
A. S. Challa, E. N. Evagelidou, V. I. Cholevas, D. N. Kiortsis, V. I. Giapros, A. A. Drougia, and S. K. Andronikou
Growth Factors and Adipocytokines in Prepubertal Children Born Small for Gestational Age: Relation to insulin resistance
Diabetes Care, April 1, 2009; 32(4): 714 - 719.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
J. Jurimae, T. Kums, and T. Jurimae
Adipocytokine and ghrelin levels in relation to bone mineral density in physically active older women: longitudinal associations
Eur. J. Endocrinol., March 1, 2009; 160(3): 381 - 385.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
D. D Briana and A. Malamitsi-Puchner
Intrauterine growth restriction and adult disease: the role of adipocytokines
Eur. J. Endocrinol., March 1, 2009; 160(3): 337 - 347.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Endocrinol. Metab.Home page
P. Kizelsztein, D. Govorko, S. Komarnytsky, A. Evans, Z. Wang, W. T. Cefalu, and I. Raskin
20-Hydroxyecdysone decreases weight and hyperglycemia in a diet-induced obesity mice model
Am J Physiol Endocrinol Metab, March 1, 2009; 296(3): E433 - E439.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
I. Kanazawa, T. Yamaguchi, M. Yamamoto, M. Yamauchi, S. Yano, and T. Sugimoto
Relationships between serum adiponectin levels versus bone mineral density, bone metabolic markers, and vertebral fractures in type 2 diabetes mellitus
Eur. J. Endocrinol., February 1, 2009; 160(2): 265 - 273.
[Abstract] [Full Text] [PDF]


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DiabetesHome page
M. A. Bostrom, B. I. Freedman, C. D. Langefeld, L. Liu, P. J. Hicks, and D. W. Bowden
Association of Adiponectin Gene Polymorphisms With Type 2 Diabetes in an African American Population Enriched for Nephropathy
Diabetes, February 1, 2009; 58(2): 499 - 504.
[Abstract] [Full Text] [PDF]


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J ANIM SCIHome page
K. R. Belsito, B. M. Vester, T. Keel, T. K. Graves, and K. S. Swanson
Impact of ovariohysterectomy and food intake on body composition, physical activity, and adipose gene expression in cats
J Anim Sci, February 1, 2009; 87(2): 594 - 602.
[Abstract] [Full Text] [PDF]


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J. Nutr.Home page
A. Cassidy, P. Skidmore, E. B. Rimm, A. Welch, S. Fairweather-Tait, J. Skinner, K. Burling, J. B. Richards, T. D. Spector, and A. J. MacGregor
Plasma Adiponectin Concentrations Are Associated with Body Composition and Plant-Based Dietary Factors in Female Twins
J. Nutr., February 1, 2009; 139(2): 353 - 358.
[Abstract] [Full Text] [PDF]


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Cancer Epidemiol. Biomarkers Prev.Home page
H. K. Neilson, C. M. Friedenreich, N. T. Brockton, and R. C. Millikan
Physical Activity and Postmenopausal Breast Cancer: Proposed Biologic Mechanisms and Areas for Future Research
Cancer Epidemiol. Biomarkers Prev., January 1, 2009; 18(1): 11 - 27.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
J. W. Sull, H. J. Kim, J. E. Yun, G. Kim, E. J. Park, S. Kim, H. Y. Lee, and S. H. Jee
Serum adiponectin is associated with family history of diabetes independently of obesity and insulin resistance in healthy Korean men and women
Eur. J. Endocrinol., January 1, 2009; 160(1): 39 - 43.
[Abstract] [Full Text] [PDF]


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Toxicol PatholHome page
O. P. Flint, M. A. Noor, P. W. Hruz, P. B. Hylemon, K. Yarasheski, D. P. Kotler, R. A. Parker, and A. Bellamine
The Role of Protease Inhibitors in the Pathogenesis of HIV-Associated Lipodystrophy: Cellular Mechanisms and Clinical Implications
Toxicol Pathol, January 1, 2009; 37(1): 65 - 77.
[Abstract] [Full Text] [PDF]


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J AndrolHome page
A. M. Traish, F. Saad, and A. Guay
The Dark Side of Testosterone Deficiency: II. Type 2 Diabetes and Insulin Resistance
J Androl, January 1, 2009; 30(1): 23 - 32.
[Abstract] [Full Text] [PDF]


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FASEB J.Home page
G. W. Wong, S. A. Krawczyk, C. Kitidis-Mitrokostas, G. Ge, E. Spooner, C. Hug, R. Gimeno, and H. F. Lodish
Identification and characterization of CTRP9, a novel secreted glycoprotein, from adipose tissue that reduces serum glucose in mice and forms heterotrimers with adiponectin
FASEB J, January 1, 2009; 23(1): 241 - 258.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Endocrinol. Metab.Home page
S. S. Deepa and L. Q. Dong
APPL1: role in adiponectin signaling and beyond
Am J Physiol Endocrinol Metab, January 1, 2009; 296(1): E22 - E36.
[Abstract] [Full Text] [PDF]


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ThoraxHome page
F M E Franssen, D E O'Donnell, G H Goossens, E E Blaak, and A M W J Schols
Obesity and the lung: 5 {middle dot} Obesity and COPD
Thorax, December 1, 2008; 63(12): 1110 - 1117.
[Abstract] [Full Text] [PDF]


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Diabetes CareHome page
C. Snehalatha, A. Yamuna, and A. Ramachandran
Plasma Adiponectin Does Not Correlate With Insulin Resistance and Cardiometabolic Variables in Nondiabetic Asian Indian Teenagers
Diabetes Care, December 1, 2008; 31(12): 2374 - 2379.
[Abstract] [Full Text] [PDF]


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J. Clin. Endocrinol. Metab.Home page
N. Rasouli and P. A. Kern
Adipocytokines and the Metabolic Complications of Obesity
J. Clin. Endocrinol. Metab., November 1, 2008; 93(11_Supplement_1): s64 - s73.
[Abstract] [Full Text] [PDF]


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J Antimicrob ChemotherHome page
J. E. Mallewa, E. Wilkins, J. Vilar, M. Mallewa, D. Doran, D. Back, and M. Pirmohamed
HIV-associated lipodystrophy: a review of underlying mechanisms and therapeutic options
J. Antimicrob. Chemother., October 1, 2008; 62(4): 648 - 660.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Endocrinol. Metab.Home page
S. A. Phillips, T. P. Ciaraldi, Deborah. K. Oh, M. K. Savu, and R. R. Henry
Adiponectin secretion and response to pioglitazone is depot dependent in cultured human adipose tissue
Am J Physiol Endocrinol Metab, October 1, 2008; 295(4): E842 - E850.
[Abstract] [Full Text] [PDF]


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J. Clin. Endocrinol. Metab.Home page
G. Maiolino, M. Cesari, D. Sticchi, M. Zanchetta, L. Pedon, K. Antezza, A. C. Pessina, and G. P. Rossi
Plasma Adiponectin for Prediction of Cardiovascular Events and Mortality in High-Risk Patients
J. Clin. Endocrinol. Metab., September 1, 2008; 93(9): 3333 - 3340.
[Abstract] [Full Text] [PDF]


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J. Nutr.Home page
P. Perez-Martinez, J. Lopez-Miranda, C. Cruz-Teno, J. Delgado-Lista, Y. Jimenez-Gomez, J. M. Fernandez, M. J. Gomez, C. Marin, F. Perez-Jimenez, and J. M. Ordovas
Adiponectin Gene Variants Are Associated with Insulin Sensitivity in Response to Dietary Fat Consumption in Caucasian Men
J. Nutr., September 1, 2008; 138(9): 1609 - 1614.
[Abstract] [Full Text] [PDF]


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J. Lipid Res.Home page
S. J. Peterson, G. Drummond, D. H. Kim, M. Li, A. L. Kruger, S. Ikehara, and N. G. Abraham
L-4F treatment reduces adiposity, increases adiponectin levels, and improves insulin sensitivity in obese mice
J. Lipid Res., August 1, 2008; 49(8): 1658 - 1669.
[Abstract] [Full Text] [PDF]


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J. Clin. Endocrinol. Metab.Home page
H. Leth, K. K. Andersen, J. Frystyk, L. Tarnow, P. Rossing, H.-H. Parving, and A. Flyvbjerg
Elevated Levels of High-Molecular-Weight Adiponectin in Type 1 Diabetes
J. Clin. Endocrinol. Metab., August 1, 2008; 93(8): 3186 - 3191.
[Abstract] [Full Text] [PDF]


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J. Clin. Endocrinol. Metab.Home page
T. M. Barber, M. Hazell, C. Christodoulides, S. J. Golding, C. Alvey, K. Burling, A. Vidal-Puig, N. P. Groome, J. A. H. Wass, S. Franks, et al.
Serum Levels of Retinol-Binding Protein 4 and Adiponectin in Women with Polycystic Ovary Syndrome: Associations with Visceral Fat But No Evidence for Fat Mass-Independent Effects on Pathogenesis in This Condition
J. Clin. Endocrinol. Metab., July 1, 2008; 93(7): 2859 - 2865.
[Abstract] [Full Text] [PDF]


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J. Clin. Endocrinol. Metab.Home page
H. Pinar, S. Basu, K. Hotmire, L. Laffineuse, L. Presley, M. Carpenter, P. M. Catalano, and S. Hauguel-de Mouzon
High Molecular Mass Multimer Complexes and Vascular Expression Contribute to High Adiponectin in the Fetus
J. Clin. Endocrinol. Metab., July 1, 2008; 93(7): 2885 - 2890.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
L. M Ritland, D L. Alekel, O. A Matvienko, K. B Hanson, J. W Stewart, L. N Hanson, M. B Reddy, M. D Van Loan, and U. Genschel
Centrally located body fat is related to appetitive hormones in healthy postmenopausal women.
Eur. J. Endocrinol., June 1, 2008; 158(6): 889 - 897.
[Abstract] [Full Text] [PDF]


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J. Clin. Pathol.Home page
R Olufadi and C D Byrne
Clinical and laboratory diagnosis of the metabolic syndrome
J. Clin. Pathol., June 1, 2008; 61(6): 697 - 706.
[Abstract] [Full Text] [PDF]


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DiabetesHome page
M. Li, D. H. Kim, P. L. Tsenovoy, S. J. Peterson, R. Rezzani, L. F. Rodella, W. S. Aronow, S. Ikehara, and N. G. Abraham
Treatment of Obese Diabetic Mice With a Heme Oxygenase Inducer Reduces Visceral and Subcutaneous Adiposity, Increases Adiponectin Levels, and Improves Insulin Sensitivity and Glucose Tolerance
Diabetes, June 1, 2008; 57(6): 1526 - 1535.
[Abstract] [Full Text] [PDF]


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J. Clin. Endocrinol. Metab.Home page
S. E. Recabarren, R. Smith, R. Rios, M. Maliqueo, B. Echiburu, E. Codner, F. Cassorla, P. Rojas, and T. Sir-Petermann
Metabolic Profile in Sons of Women with Polycystic Ovary Syndrome
J. Clin. Endocrinol. Metab., May 1, 2008; 93(5): 1820 - 1826.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
C Joaquin, E Aguilera, M L Granada, M C Pastor, I Salinas, N Alonso, and A Sanmarti
Effects of GH treatment in GH-deficient adults on adiponectin, leptin and pregnancy-associated plasma protein-A.
Eur. J. Endocrinol., April 1, 2008; 158(4): 483 - 490.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
M. Kyriakakou, A. Malamitsi-Puchner, H. Militsi, T. Boutsikou, A. Margeli, D. Hassiakos, C. Kanaka-Gantenbein, I. Papassotiriou, and G. Mastorakos
Leptin and adiponectin concentrations in intrauterine growth restricted and appropriate for gestational age fetuses, neonates, and their mothers
Eur. J. Endocrinol., March 1, 2008; 158(3): 343 - 348.
[Abstract] [Full Text] [PDF]


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J. Clin. Endocrinol. Metab.Home page
Y. Tabara, H. Osawa, R. Kawamoto, R. Tachibana-Iimori, M. Yamamoto, J. Nakura, T. Miki, H. Makino, and K. Kohara
Reduced High-Molecular-Weight Adiponectin and Elevated High-Sensitivity C-Reactive Protein Are Synergistic Risk Factors for Metabolic Syndrome in a Large-Scale Middle-Aged to Elderly Population: the Shimanami Health Promoting Program Study
J. Clin. Endocrinol. Metab., March 1, 2008; 93(3): 715 - 722.
[Abstract] [Full Text] [PDF]


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Eur Heart J SupplHome page
R. W. Nesto and K. Mackie
Endocannabinoid system and its implications for obesity and cardiometabolic risk
Eur. Heart J. Suppl., March 1, 2008; 10(suppl_B): B34 - B41.
[Abstract] [Full Text] [PDF]


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The Diabetes EducatorHome page
P. Hollander
Cardiometabolic Risk Factors and Visceral Adipose Tissue
The Diabetes Educator, March 1, 2008; 34(Supplement_2): 37S - 41S.
[Abstract] [Full Text] [PDF]


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The Diabetes EducatorHome page
S. T. Boyd
Management Through Risk Factor Modification
The Diabetes Educator, March 1, 2008; 34(Supplement_2): 42S - 48S.
[Abstract] [Full Text] [PDF]


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CirculationHome page
M. K. Ohman, Y. Shen, C. I. Obimba, A. P. Wright, M. Warnock, D. A. Lawrence, and D. T. Eitzman
Visceral Adipose Tissue Inflammation Accelerates Atherosclerosis in Apolipoprotein E-Deficient Mice
Circulation, February 12, 2008; 117(6): 798 - 805.
[Abstract] [Full Text] [PDF]


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Chronic Respiratory DiseaseHome page
M. Poulain, M. Doucet, V. Drapeau, G. Fournier, A. Tremblay, P. Poirier, and F. Maltais
Metabolic and inflammatory profile in obese patients with chronic obstructive pulmonary disease
Chronic Respiratory Disease, February 1, 2008; 5(1): 35 - 41.
[Abstract] [PDF]


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Am. J. Clin. Nutr.Home page
J. Koska, N. Stefan, P. A Permana, C. Weyer, M. Sonoda, C. Bogardus, S. R Smith, D. R Joanisse, T. Funahashi, J. Krakoff, et al.
Increased fat accumulation in liver may link insulin resistance with subcutaneous abdominal adipocyte enlargement, visceral adiposity, and hypoadiponectinemia in obese individuals
Am. J. Clinical Nutrition, February 1, 2008; 87(2): 295 - 302.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
E. L Madsen, A. Rissanen, J. M Bruun, K. Skogstrand, S. Tonstad, D. M Hougaard, and B. Richelsen
Weight loss larger than 10% is needed for general improvement of levels of circulating adiponectin and markers of inflammation in obese subjects: a 3-year weight loss study
Eur. J. Endocrinol., February 1, 2008; 158(2): 179 - 187.
[Abstract] [Full Text] [PDF]


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J. Nutr.Home page
M. E. Spurlock and N. K. Gabler
The Development of Porcine Models of Obesity and the Metabolic Syndrome
J. Nutr., February 1, 2008; 138(2): 397 - 402.
[Abstract] [Full Text] [PDF]


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DiabetesHome page
S. H. S. Santos, L. R. Fernandes, E. G. Mario, A. V. M. Ferreira, L. C. J. Porto, J. I. Alvarez-Leite, L. M. Botion, M. Bader, N. Alenina, and R. A. S. Santos
Mas Deficiency in FVB/N Mice Produces Marked Changes in Lipid and Glycemic Metabolism
Diabetes, February 1, 2008; 57(2): 340 - 347.
[Abstract] [Full Text] [PDF]


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Eur Heart JHome page
A. M.J. Wassink, Y. van der Graaf, J. K. Olijhoek, F. L.J. Visseren, and for the SMART Study Group
Metabolic syndrome and the risk of new vascular events and all-cause mortality in patients with coronary artery disease, cerebrovascular disease, peripheral arterial disease or abdominal aortic aneurysm
Eur. Heart J., January 2, 2008; 29(2): 213 - 223.
[Abstract] [Full Text] [PDF]


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Diabetes and Vascular Disease ResearchHome page
J. Saltevo, M. Vanhala, H. Kautiainen, and M. Laakso
Levels of adiponectin, C-reactive protein and interleukin-1 receptor antagonist are associated with the relative change in body mass index between childhood and adulthood
Diabetes and Vascular Disease Research, December 1, 2007; 4(4): 328 - 331.
[Abstract] [PDF]


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ERRHome page
I. A. Harsch
Metabolic disturbances in patients with obstructive sleep apnoea syndrome
Eur. Respir. Rev., December 1, 2007; 16(106): 196 - 202.
[Abstract] [Full Text] [PDF]


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Journals of Gerontology Series A: Biological Sciences and Medical SciencesHome page
S. E. Yeo, N. P. Hays, R. A. Dennis, P. M. Kortebein, D. H. Sullivan, W. J. Evans, and R. H. Coker
Fat Distribution and Glucose Metabolism in Older, Obese Men and Women
J. Gerontol. A Biol. Sci. Med. Sci., December 1, 2007; 62(12): 1393 - 1401.
[Abstract] [Full Text] [PDF]


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J. Clin. Endocrinol. Metab.Home page
T. Sir-Petermann, M. Maliqueo, E. Codner, B. Echiburu, N. Crisosto, V. Perez, F. Perez-Bravo, and F. Cassorla
Early Metabolic Derangements in Daughters of Women with Polycystic Ovary Syndrome
J. Clin. Endocrinol. Metab., December 1, 2007; 92(12): 4637 - 4642.
[Abstract] [Full Text] [PDF]


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Clin. Chem.Home page
M. K. Sinha, T. Songer, Q. Xiao, J. H. Sloan, J. Wang, S. Ji, W. E. Alborn, R. A. Davis, M. M. Swarbrick, K. L. Stanhope, et al.
Analytical Validation and Biological Evaluation of a High Molecular-Weight Adiponectin ELISA
Clin. Chem., December 1, 2007; 53(12): 2144 - 2151.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
L. Hojbjerre, M. Rosenzweig, F. Dela, J. M Bruun, and B. Stallknecht
Acute exercise increases adipose tissue interstitial adiponectin concentration in healthy overweight and lean subjects
Eur. J. Endocrinol., November 1, 2007; 157(5): 613 - 623.
[Abstract] [Full Text] [PDF]


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Am. J. Clin. Nutr.Home page
M. H Rokling-Andersen, J. E Reseland, M. B Veierod, S. A Anderssen, D. R Jacobs Jr, P. Urdal, J.-O. Jansson, and C. A Drevon
Effects of long-term exercise and diet intervention on plasma adipokine concentrations
Am. J. Clinical Nutrition, November 1, 2007; 86(5): 1293 - 1301.
[Abstract] [Full Text] [PDF]


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Diabetes CareHome page
T. W.K. Ng, G. F. Watts, P. H. R. Barrett, K.-A. Rye, and D. C. Chan
Effect of Weight Loss on LDL and HDL Kinetics in the Metabolic Syndrome: Associations with changes in plasma retinol-binding protein-4 and adiponectin levels
Diabetes Care, November 1, 2007; 30(11): 2945 - 2950.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
A. Galler, G. Gelbrich, J. Kratzsch, N. Noack, T. Kapellen, and W. Kiess
Elevated serum levels of adiponectin in children, adolescents and young adults with type 1 diabetes and the impact of age, gender, body mass index and metabolic control: a longitudinal study
Eur. J. Endocrinol., October 1, 2007; 157(4): 481 - 489.
[Abstract] [Full Text] [PDF]


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J. Lipid Res.Home page
K. A. Varady, D. J. Roohk, Y. C. Loe, B. K. McEvoy-Hein, and M. K. Hellerstein
Effects of modified alternate-day fasting regimens on adipocyte size, triglyceride metabolism, and plasma adiponectin levels in mice
J. Lipid Res., October 1, 2007; 48(10): 2212 - 2219.
[Abstract] [Full Text] [PDF]


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J. Nutr.Home page
S. Murosaki, T. R. Lee, K. Muroyama, E. S. Shin, S. Y. Cho, Y. Yamamoto, and S. J. Lee
A Combination of Caffeine, Arginine, Soy Isoflavones, and L-Carnitine Enhances Both Lipolysis and Fatty Acid Oxidation in 3T3-L1 and HepG2 Cells in Vitro and in KK Mice in Vivo
J. Nutr., October 1, 2007; 137(10): 2252 - 2257.
[Abstract] [Full Text] [PDF]


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Am J EpidemiolHome page
D. M. Maahs, L. G. Ogden, J. K. Snell-Bergeon, G. L. Kinney, R. P. Wadwa, J. E. Hokanson, D. Dabelea, A. Kretowski, R. H. Eckel, and M. Rewers
Determinants of Serum Adiponectin in Persons with and without Type 1 Diabetes
Am. J. Epidemiol., September 15, 2007; 166(6): 731 - 740.
[Abstract] [Full Text] [PDF]


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Endocr Relat CancerHome page
Y.-F. Tian, C.-H. Chu, M.-H. Wu, C.-L. Chang, T. Yang, Y.-C. Chou, G.-C. Hsu, C.-P. Yu, J.-C. Yu, and C.-A. Sun
Anthropometric measures, plasma adiponectin, and breast cancer risk
Endocr. Relat. Cancer, September 1, 2007; 14(3): 669 - 677.
[Abstract] [Full Text] [PDF]


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Endocr Relat CancerHome page
L. Cong, J. Gasser, J. Zhao, B. Yang, F. Li, and A. Z Zhao
Human adiponectin inhibits cell growth and induces apoptosis in human endometrial carcinoma cells, HEC-1-A and RL95 2
Endocr. Relat. Cancer, September 1, 2007; 14(3): 713 - 720.
[Abstract] [Full Text] [PDF]


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Eur J EndocrinolHome page
M. Bullo, M. R Peeraully, P. Trayhurn, J Folch, and J. Salas-Salvado
Circulating nerve growth factor levels in relation to obesity and the metabolic syndrome in women
Eur. J. Endocrinol., September 1, 2007; 157(3): 303 - 310.
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Am. J. Clin. Nutr.Home page
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Adiponectin in relation to malignancies: a review of existing basic research and clinical evidence
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