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PubMed2006

Increased basal platelet activity, plasma adiponectin levels, and diabetes mellitus are associated with poor platelet responsiveness to in vitro effect of aspirin.

INTRODUCTION: Aspirin is one of the most effective antiplatelet agents and is now commonly used to prevent vascular events. In some patients, however, recurrent vascular events have been demonstrated despite aspirin therapy. Our objective was to characterize individuals showing poor response to in vitro effect of aspirin, using PFA-100. METHODS: One hundred sixty-eight healthy male subjects were analyzed. We assessed platelet function tests, including PFA-100, whole blood aggregation, and optical platelet aggregation. Also measured were hemostatic and other parameters including von Willebrand factor (VWF:Ag), VWF ristocetin cofactor activity (VWF:RCo), soluble vascular adhesion molecule-1 (sVCAM-1), high sensitive C-reactive protein (hs-CRP), and adiponectin. Poor responders were defined as having a collagen/epinephrine-induced closure time (CEPI-CT) under 250 s with PFA-100 when incubated with 10 microM aspirin, whereas good responders were defined as having a CEPI-CT of more than 250 s. RESULTS AND CONCLUSIONS: PFA-100 tests revealed that 40 subjects (24%) were poor responders (PR) and 128 (76%) were good responders (GR). Poor responsiveness was significantly associated with (1) higher basal platelet activities in PFA-100, as well as in whole blood aggregation and aggregometer;(2) increased level of adiponectin (8.8+/-4.1 micro g/mL [PR] vs 7.3+/-2.9 micro g/mL [GR], p=0.010);and (3) the presence of diabetes mellitus (17.5% [PR] vs 4.7% [GR], p=0.009). Importantly, whereas 24% of the subjects showed insufficient inhibition in PFA-100 when incubated with 10 microM aspirin, almost all subjects showed maximum inhibition with 30 microM aspirin. These observations suggest that higher doses of aspirin might overcome aspirin resistance.

Adiponectin↗
PubMed2003

Mutations in the adiponectin gene in lean and obese subjects from the Swedish obese subjects cohort.

Adiponectin (also called AdipoQ, gelatin-binding protein 28, Acrp30) DNA sequence variants were determined in 96 unrelated female subjects with severe obesity (mean body mass index [BMI], 42.3 kg/m2) and in 96 non-obese female controls (mean BMI, 23.0 kg/m2) from the Swedish Obese Subjects (SOS) cohort. A single base substitution (T45G) at codon 15 of exon 2 resulting in no change in amino acid (Gly15Gly) was found in equal frequencies among obese and control subjects. However, this polymorphism was associated with serum cholesterol and waist circumference (P=.023 and.043, respectively) in the obese group. A IVS2 + G62T sequence variation was also identified, but had similar prevalence rates in obese and control subjects. Blood glucose was highest in the obese female subjects who were homozygotes for the G allele (GG) of the IVS2 + G62T polymorphism (N=56; P=.033) and all the diabetics (n=6) in this sample were in this group. IVS2 + G62T polymorphism was also associated with BMI (P=.014), diastolic blood pressure (P=.009), and sagittal diameter (P=.032). A missense point mutation at codon 111 (Tyr111His) was not associated with any obesity-related phenotypes. In conclusion, adiponectin DNA sequence variations might play a role in the complications of morbid obesity and should be further investigated.

Adiponectin↗
PubMed2006

Adiponectin and cancer: a systematic review.

Recent studies have demonstrated that obesity is a significant risk factor for the development of several malignancies, but the mechanisms underlying this relationship remain to be fully elucidated. Adiponectin, an adipocyte secreted endogenous insulin sensitizer, appears to play an important role not only in glucose and lipid metabolism but also in the development and progression of several obesity-related malignancies. In this review, we present recent findings on the association of adiponectin with several malignancies as well as recent data on underlying molecular mechanisms that provide novel insights into the association between obesity and cancer risk. We also identify important research questions that remain unanswered.

Adiponectin↗
PubMed2005

Adiponectin receptor gene expression in human skeletal muscle cells is not regulated by fibrates and thiazolidinediones.

BACKGROUND: Thiazolidinediones as PPARgamma agonists and fibrates as PPARalpha agonists improve insulin sensitivity in insulin-responsive tissues. Recent data show an induction of adiponectin receptor 2 (AdipoR2) by PPARalpha and PPARgamma agonists in human macrophages. OBJECTIVE: In this study, we examined the effects of thiazolidinediones and fibrates on the expression of adiponectin receptors in human skeletal muscle cells, an important cell type in the context of insulin resistance. RESULTS AND METHODS: In vitro differentiated human myotubes treated with troglitazone or rosiglitazone (20 h) showed no significant changes in AdipoR1 and AdipoR2 mRNA expression. PPARgamma activation was controlled by determination of PPARgamma mRNA induction. Likewise, differentiated myotubes treated with Wy-14,643 or fenofibrate (20 h) revealed no significant regulation of AdipoR1 and AdipoR2 mRNA. PPARalpha activation was assessed by measuring PDHK4 mRNA expression. CONCLUSION: Induction of AdipoR gene expression in human skeletal muscle cells is not involved in the insulin-sensitizing effects of thiazolidinediones or fibrates.

Adult↗
PubMed2006

Adiponectin versus angiotensin II: Key pathological role of their misbalance.

Kurata et al. report that an angiotensin II type-1 receptor blocker (ARB) inhibits obesity-induced hypoadiponectinemia in rats through inhibition of reactive oxygen species generation. Taken together with the recently reported functional interplay between adiponectin and angiotensin II, this suggests that adiponectin probably mediates tissue-protective effects of ARBs in obesity and metabolic syndrome.

Adiponectin↗
PubMed2006

[Current laboratory parameters in the differential diagnosis of type 2 diabetes mellitus. Proinsulin, adiponectin and others].

During the recent years increasing knowledge has been obtained in the understanding of the coincidence of type 2 diabetes and cardiovascular disease. Insulin resistance and beta cell failure were shown to have a direct impact in the pathogenesis of arteriosclerosis which goes far beyond the effects of elevated glucose levels. The use of additional laboratory parameters for the characterisation of patients with type 2 diabetes on a pathophysiological basis might improve treatment strategies and might help to reduce the cardiovascular risk in patients with type 2 diabetes. Intact proinsulin is secreted from the beta cell and increasing levels of intact proinsulin serve as an indicator of beta cell failure. In addition, increased levels of intact proinsulin were shown to predict insulin resistance with a specificity of 100 % and a sensitivity of about 50 %. On the other side, adiponectin, derived from the visceral adipose tissue, serves as a marker closely correlated to insulin sensitivity. Plasma adiponectin is a very sensitive marker of insulin resistance and might be used for the judgement of therapeutical interventions aimed to improve insulin sensitivity. In addition, both markers are predictive for the estimation of cardiovascular risk in patients with type 2 diabetes. Measurement of inflammation, by high sensitive CRP might add further information about the cardiovascular risk of a patient with type 2 diabetes.

Adiponectin↗
PubMed2005

A diet supplemented with husks of Plantago ovata reduces the development of endothelial dysfunction, hypertension, and obesity by affecting adiponectin and TNF-alpha in obese Zucker rats.

The aim of the present study was to analyze whether consumption of a fiber-supplemented diet containing 3.5% Plantago ovata husks prevented many of the abnormalities clustered in the metabolic syndrome, including obesity, dyslipidemia, hypertension and endothelial dysfunction. For this purpose, obese Zucker rats, a model of type 2 diabetes, and their lean littermates were studied. Rats consumed a standard control diet or that diet supplemented with 3.5% P. ovata husks for 25 wk. Body weights were measured weekly. Systolic blood pressure (SBP) was measured monthly. At the end of the treatment, plasma concentrations of triglycerides, total cholesterol, FFAs, glucose, insulin, adiponectin, and tumor necrosis factor alpha (TNF-alpha) were determined, and studies on vascular function were performed using aortic rings. Rats fed the P. ovata husk-supplemented diet had a significantly reduced body weight gain compared with those fed the standard diet. Decreased endothelium-dependent relaxation in response to acetylcholine (ACh) by aortic rings from obese Zucker rats was improved in those fed the fiber-supplemented diet. The greater SBP, higher plasma concentrations of triglycerides, total cholesterol, FFA, glucose, insulin, and TNF-alpha, and the hypoadinectinemia that occurred in obese Zucker rats that consumed the control diet were significantly improved in those fed the fiber-supplemented diet. We conclude that intake of a P. ovata husk-supplemented diet prevents endothelial dysfunction, hypertension, and obesity development, and ameliorates dyslipidemia and abnormal plasma concentrations of adiponectin and TNF-alpha in obese Zucker rats.

Adiponectin↗
PubMed2006

Low number of omental preadipocytes with high leptin and low adiponectin secretion is associated with high fasting plasma glucose levels in obese subjects.

OBJECTIVE: This study investigates whether fasting plasma glucose (FPG) levels in obese subjects are associated with the number of preadipocytes and their adipokine-secretion capabilities. DESIGN: Abdominal subcutaneous and omental adipose tissues were obtained from 10 female and four male obese subjects (age 37 +/- 8 years; BMI 48 +/- 13 kgm(2)) with a wide range of FPG (range: 4.3-10.6 mm). Stromal vascular cells (SVC) were isolated and cultured and the number of attached SVC (aSVC) per gram adipose tissue determined. The aSVCs were differentiated in vitro to become adipocytes, and the secretion of the adipokine leptin and adiponectin in the culture media was determined. Spearman rank correlation coefficients were calculated between FPG and preadipocyte number and adipokine secretion. PATIENTS: Subject-inclusion criteria: BMI >40 kg/m(2) and for severe comorbid conditions BMI >35 kg/m(2). Subject-exclusion criteria: severe cardiopulmonary pathology (ASA class 3), history of bariatric surgery, manifest psychopathology, 18 years < age > 60 years and for upper-abdominal surgery, age >50 years. All females in the study had regular menstrual periods. None of participants received glucose-lowering medication. RESULTS: No association was observed between BMI and fasting glucose levels. More than 90 +/- 20% of the cultured aSVC fraction was able to store fat droplets, indicating the presence of preadipocytes. A strong negative association was observed between omental preadipocyte number and FPG. A strong association was observed between adipokine secretion by the omental preadipocytes and FPG. No association was observed between subcutaneous preadipocyte number and adipokine secretion and FPG. CONCLUSIONS: In morbid obese subjects, low number of omental preadipocytes with high-leptin- and low-adiponectin-secretion profiles is associated with high FPG.

Adipocytes↗
PubMed2006

Adiponectin and cardiovascular disease: state of the art?

The cardiometabolic syndrome, associated with increased cardiovascular disease risk in the industrialized world, is estimated to affect one in four adults. Although the mechanisms linking obesity and cardiovascular disease remain unclear, research continues to unravel the molecular pathways behind this pandemic. Adipose tissue has emerged as a metabolically active participant in mediating vascular complications, serving as an active endocrine and paracrine organ secreting adipokines, which participate in diverse metabolic processes. Among these adipokines is adiponectin, which seems to possess antiatherogenic and anti-inflammatory effects and may be protective against cardiovascular disease development. The current review describes the pathophysiology of adiponectin in atherosclerotic disease.

Adiponectin↗
PubMedDate not supplied

Effects of fasting and refeeding on serum leptin, adiponectin and free fatty acid concentrations in young and old male rats.

BACKGROUND: Regulatory mechanisms of metabolic homeostasis undergo important alterations during ageing. The age-related changes become often evident only during stimulation of basic functions that occurs, e.g. during fasting and refeeding which represent natural challenge to energy metabolism. OBJECTIVE: To determine the effect of short-term fasting and subsequent refeeding on serum levels of key hormones and metabolites in young adult 5- and 24-month-old male Wistar rats. METHODS: Control rats were fed ad libitum. Animals were fasted for 48 h or fasted and refed for 24 h. Metabolite serum concentrations were measured by standard methods. Leptin and insulin were determined by rat-specific RIA, and adiponectin serum levels by mouse/rat-specific ELISA. RESULTS: (1) Control serum levels of key metabolites and hormones were similar in both age groups except for increased triglycerides (TG) in old fed rats. (2) Fasting caused a significant decrease of leptin, insulin, glucose, and TG serum levels in both age groups, and an increase of free fatty acids (FFA) concentration, however, only in young animals. (3) Upon refeeding serum glucose, TG and insulin reversed to control levels in both age groups, however, FFA concentration decreased to control values only in young rats. (4) In contrast to young animals, refeeding of old rats did not increase serum leptin concentration to control level. (5) Neither fasting nor refeeding changed adiponectin serum levels in both age groups. CONCLUSION: Aging suppresses leptin secretion and metabolism of FFA during refeeding that follows short-term starvation. In old rats serum levels of FFA are refractive to the alterations induced by fasting/refeeding in young ones.

Adiponectin↗
PubMed2006

Adrenarche in Prader-Willi syndrome appears not related to insulin sensitivity and serum adiponectin.

Prader-Willi syndrome (PWS) is a genetic disorder characterized by dysmorphic features, obesity, hypogonadism, hypotonia and mental retardation. Obesity has been linked to insulin resistance and the latter has also been associated with premature adrenarche. Since up to date a controlled study to investigate adrenarche and its hormonal regulation was lacking in PWS, our aim was to assess whether prepubertal PWS patients develop premature adrenarche and its relationship with markers of insulin sensitivity. Fourteen prepubertal children with PWS (6 M, 8 F) and 10 non-syndromal simple obese matched controls (5 M, 5 F) participated (mean age: 7.62 +/- 1.84 years). A fasting blood sample was obtained for adrenal and ovarian androgens, sex hormone binding globulin, insulin-like growth factor-I (IGF-I), insulin-like growth factor binding protein-1, leptin, adiponectin and a lipid profile. Thereafter an oral glucose tolerance test was performed. PWS patients were smaller at birth and a higher proportion displayed premature pubarche. No differences were found in testosterone, androstenedione, sex hormone binding globulin, free androgen index, homeostatic model assessment-IR, 2-hour insulin, leptin or adiponectin levels. 17-hydroxyprogesterone and DHEAS levels however, were significantly higher in PWS. IGF-I levels were significantly lower in PWS and correlated significantly with height SDS (p < 0.05). In conclusion, a higher proportion of premature adrenarche in our PW patients was observed, which was not explained by differences in insulin sensitivity or plasma levels of adipokines and IGF-I.

Adiponectin↗
PubMed2006

The role of adiponectin in atherosclerosis and thrombosis.

Obesity is a major risk factor for morbidity and mortality from cardiovascular causes. Adiponectin has been identified recently as one of the adipocytokines with important metabolic effects. It can suppress atherogenesis by inhibiting the adherence of monocytes, reducing their phagocytic activity, and suppressing the accumulation of modified lipoproteins in the vascular wall. In addition, as adiponectin decrease endothelial damage and stimulates production of NO from vascular endothelial cells, hypoadiponectinemia may be partially contribute to thrombus formation.

Adiponectin↗
PubMed2004

Leptin modulates orexigenic effects of ghrelin and attenuates adiponectin and insulin levels and selectively the dark-phase feeding as revealed by central leptin gene therapy.

We tested the hypothesis that leptin acts centrally and peripherally by different mechanisms to control peripheral hormones that normally regulate weight homeostasis. The paradigm of selectively increasing leptin transgene expression with a single intracerebroventricular injection of adeno-associated viral vectors encoding leptin (rAAV-lep) or green fluorescent protein (control) in the hypothalamus of mutant leptin-deficient ob/ob and wild-type (wt) mice was employed in these experiments. rAAV-lep injection increased hypothalamic leptin expression in the complete absence of peripheral leptin in ob/ob mice; suppressed body weight and adiposity; voluntarily decreased dark-phase food intake; suppressed plasma levels of adiponectin, TNFalpha, free fatty acids and insulin, concomitant with normoglycemia; and elevated ghrelin levels for extended period. Body weight and plasma levels of leptin and metabolic variables were suppressed to a lesser extent in rAAV-lep wt mice without decreasing food intake. The sustained high leptin transgene expression decreased only the dark-phase phagia in both genotypes, but wt mice escaped from leptin restraint during the lights-on phase, resulting in normal overall food intake. Leptin administration rapidly decreased plasma gastric ghrelin and adipocyte adiponectin but not TNFalpha levels, thereby demonstrating a peripheral restraining action of leptin on the secretion of hormones of varied origins. Whereas ghrelin administration readily stimulated feeding in controls, it was completely ineffective in rAAV-lep-treated wt mice. Thus, leptin expressed locally in the hypothalamus counteracted the central orexigenic effects of peripheral ghrelin. Cumulatively, these results identify newer central and peripheral modulatory influences of leptin on hormonal signals of disparate origin implicated in weight homeostasis and metabolic disorders.

Adipocytes↗
PubMed2004

Induction of adiponectin in skeletal muscle by inflammatory cytokines: in vivo and in vitro studies.

Adiponectin (ApN) is an adipocytokine that plays a fundamental role in energy homeostasis and counteracting inflammation. We examined whether ApN could be induced in a nonadipose tissue, the skeletal muscle, in vivo, and in cultured myotubes in response to lipopolysaccharides or proinflammatory cytokines. We next explored the underlying mechanisms. In vivo, injection of lipopolysaccharides to mice caused, after 24 h, an approximately 10-fold rise in ApN mRNA abundance and a concomitant 70% increase in ApN levels in tibialis anterior muscle. This ApN induction was reproduced in C2C12 myotubes cultured for 48 h with a proinflammatory cytokine combination, interferon-gamma + TNFalpha. This effect occurred in a time- and dose-dependent manner. Several pieces of evidence suggest that nitric oxide (NO) mediates this up-regulation by cytokines in myotubes or muscle. First, ApN was induced in vitro exclusively in the experimental conditions that stimulated NO production. Second, inducible NO synthase mRNA induction or NO production clearly preceded ApN mRNA induction. Third, preventing NO production by inhibitors of the NO synthases, nitro-L-arginine methyl ester or NG-methyl-L-arginine, suppressed the inductive effect of the cytokines in vitro and in vivo. Finally, ApN mRNA induction by cytokines was reproduced in cultured human myotubes. In conclusion, our data provide evidence that adiponectin is up-regulated in vivo and in vitro in human and rodent myotubes in response to inflammatory stimuli. The underlying mechanisms seem to involve a NO-dependent pathway. This overexpression may be viewed as a local antiinflammatory protection and a way to deliver extra energy supplies during inflammation.

Adiponectin↗
PubMed2006

Liver adenosine monophosphate-activated kinase-alpha2 catalytic subunit is a key target for the control of hepatic glucose production by adiponectin and leptin but not insulin.

The AMP-activated kinase (AMPK) is a serine threonine kinase that functions as a fuel sensor to regulate energy balance at both cellular and whole-body levels. Here we studied how hepatic AMPKalpha2 isoform affects hepatic glucose production and peripheral glucose uptake in vivo. We generated mice deleted for the AMPKalpha2 gene specifically in the liver (liveralpha2KO). Liveralpha2KO mice were glucose intolerant and hyperglycemic in the fasted state. Hyperglycemia was associated with a 50% higher endogenous glucose production than in controls as assessed in vivo. We then investigated whether this increased glucose production was sensitive to insulin. Insulin, when infused at a rate inducing physiological hyperinsulinemia, totally inhibited endogenous glucose production in liveralpha2KO mice, showing that they had normal insulin sensitivity. This was confirmed in vivo by normal insulin-induced phosphorylation of Akt and transcriptional regulation of the phosphoenolpyruvate carboxykinase, glucose-6 phosphatase, and pyruvate kinase in liver during the fasted/fed transition. Leptin and adiponectin regulate hepatic glucose production, so we then infused these adipokines into liveralpha2KO mice. Neither of these adipokines regulated hepatic glucose production in mice lacking hepatic AMPKalpha2, whereas both did so in control mice. In conclusion, we show that the hepatic AMPKalpha2 isoform is essential for suppressing hepatic glucose production and maintaining fasting blood glucose levels in the physiological range. We also demonstrate that regulation of hepatic glucose production by leptin and adiponectin, but not insulin, requires hepatic AMPKalpha2 activity.

AMP-Activated Protein Kinases↗
PubMed2006

Increased maternal nutrition stimulates peroxisome proliferator activated receptor-gamma, adiponectin, and leptin messenger ribonucleic acid expression in adipose tissue before birth.

During fetal life, adipose tissue is predominantly comprised of brown or thermogenic adipocytes and there is a transition to white, lipid-storing adipocytes after birth concomitant with the onset of suckling. In pregnancies complicated by gestational diabetes, the fetus is hyperglycemic, has an increased fat mass, and is at increased risk of obesity in later life. In the present study, we have investigated the hypothesis that exposure to increased maternal nutrition during late gestation results in increased expression of genes that regulate adipogenesis and lipogenesis in perirenal fat in fetal sheep. Pregnant ewes were fed either at or approximately 55% above maintenance energy requirements during late pregnancy and quantitative RT-PCR was used to measure peroxisome proliferator-activated receptor gamma, lipoprotein lipase, glycerol-3-phosphate dehydrogenase, adiponectin, and leptin mRNA expression. We report that exposure to metabolic and hormonal signals of increased nutrition before birth results in an increase in the expression of the adipogenic factor, peroxisome proliferator-activated receptor gamma, and in lipoprotein lipase, adiponectin, and leptin mRNA expression in fetal perirenal fat. We propose that an increase in maternal, and hence fetal, nutrition results in a precocial increase in adipogenic, lipogenic, and adipokine gene expression in adipose tissue and that these changes may be important in the development of obesity in later life.

Adiponectin↗
PubMed2003

Effects of growth hormone (GH) on ghrelin, leptin, and adiponectin in GH-deficient patients.

Ghrelin is a recently discovered gastric peptide that increases appetite, glucose oxidation, and lipogenesis and stimulates the secretion of GH. In contrast to ghrelin, GH promotes lipolysis, glucose production, and insulin secretion. Both ghrelin and GH are suppressed by intake of nutrients, especially glucose. The role of GH in the regulation of ghrelin has not yet been established. We investigated the effect of GH on circulating levels of ghrelin in relation to its effects on glucose, insulin, body composition, and the adipocyte-derived peptides leptin and adiponectin. Thirty-six patients with adult-onset GH deficiency received recombinant human GH for 9 months in a placebo-controlled study. Body composition and fasting serum analytes were assessed at baseline and at the end of the study. The GH treatment was accompanied by increased serum levels of IGF-I, reduced body weight (-2%) and body fat (-27%), and increased serum concentrations of glucose (+10%) and insulin (+48%). Ghrelin levels decreased in 30 of 36 subjects by a mean of -29%, and leptin decreased by a mean of -24%. Adiponectin increased in the women only. The decreases in ghrelin and leptin correlated with changes in fat mass, fat-free mass, and IGF-I. The reductions in ghrelin were predicted independently of the changes in IGF-I and fat mass. It is likely that the reductions in ghrelin and leptin reflect the metabolic effects of GH on lipid mobilization and glucose production. Possibly, a suppression of ghrelin promotes loss of body fat in GH-deficient patients receiving treatment. The observed correlation between the changes in ghrelin and IGF-I may suggest that the GH/IGF-I axis has a negative feedback on ghrelin secretion.

Adiponectin↗
PubMed2005

The "obese insulin-sensitive" adolescent: importance of adiponectin and lipid partitioning.

There is a wide interindividual variation in peripheral insulin sensitivity at any given body mass index or percent body fat among obese adolescents with normal glucose tolerance. The goals of this study were to determine whether variability in insulin sensitivity is associated with differences in patterns of lipid partitioning or substrate use under fasting and hyperinsulinemic conditions. We compared 14 obese insulin-resistant adolescents with 14 obese insulin-sensitive controls, pair matched for age, gender, pubertal stage and body composition. Insulin sensitivity was assessed by the hyperinsulinemic-euglycemic clamp, intramyocellular lipid content by (1)H-nuclear magnetic resonance and visceral fat by magnetic resonance imaging. Obese insulin-sensitive subjects had lower intramyocellular (1.64 +/- 0.68 vs.2.26 +/- 0.62% of water peak, P = 0.017) and visceral lipid deposition (45 +/- 23 vs. 77 +/- 52 cm(2), P = 0.04) and a higher level of adiponectin, compared with their obese-resistant counterparts (8.8 +/- 3.6 vs. 6.5 +/- 1.8 mug/dl, P = 0.015). Glycerol fluxes were similar between the two obese groups yet occurred in the face of different concentrations of insulin. Intramyocellular lipid and visceral fat were negatively related to insulin sensitivity. Obese insulin-sensitive adolescents are characterized by lower lipid deposition in the intramyocellular and visceral compartments and greater levels of adiponectin, despite similar degree of adiposity.

Adiponectin↗