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           Search results for: Human Adiponectin ELISA   

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#28942443   2017/09/24 Save this To Up

A Novel Role of SIRT1/ FGF-21 in Taurine Protection Against Cafeteria Diet-Induced Steatohepatitis in Rats.

Non-alcoholic fatty liver disease (NAFLD) is one of the alarmingly rising clinical problems in the 21st century with no effective drug treatment until now. Taurine is an essential amino acid in humans that proved efficacy as a non-pharmacological therapy in a plethora of diseases; however, its impact on NAFLD remains elusive. The aim of the current study is to evaluate the protective mechanism of taurine in experimental steatohepatitis induced by junk food given as cafeteria-diet (CAF-D) in male albino rats.

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#28926298   2017/09/19 Save this To Up

Association Between Coffee Consumption and Circulating Levels of Adiponectin and Leptin.

Coffee has been proposed to have benefits for chronic diseases; however, the relevant mechanism remains to be elucidated. We conducted a cross-sectional study and evaluated the levels of adiponectin and leptin in relation to coffee consumption. We included a total of 4406 individuals (men = 2587 and women = 1819) for adiponectin analysis and 2922 individuals (men = 1731 and women = 1191) for leptin analysis. Participants answered number of cups of coffee per week and types of coffee they consumed and their serum levels of adiponectin and leptin were measured using an enzyme-linked immunosorbent assay. We found that increasing coffee consumption was associated with increased levels of adiponectin among women; geometric means of adiponectin were 8.0 (95% CI: 7.2-8.9 μg/mL) among women who regularly consumed 15 or greater cups/week, but 7.5 (95% CI: 6.8-8.4 μg/mL) among women who did not consume coffee (P for trend = .009). Leptin levels were inversely associated with coffee consumption among both men and women (P for trend = .04 for men and 0.04 for women); geometric means of 15 or greater cups of coffee per week were 2.6 (95% CI: 2.4-2.8 ng/mL) among men and 5.1 (95% CI: 4.5-5.8 ng/mL) among women, but for noncoffee drinkers, geometric means were 3.0 (95% CI: 2.7-3.3 ng/mL) for men and 5.8 (95% CI: 5.1-6.6 ng/mL) for women. Coffee consumption was associated with higher circulating levels of adiponectin and lower circulating levels of leptin. Our study may suggest that improvement in adipocyte function contributes to the beneficial metabolic effects of coffee consumption.

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#28893239   2017/09/12 Save this To Up

Association of TCM body constitution with insulin resistance and risk of diabetes in impaired glucose regulation patients.

Impaired glucose regulation (IGR) patients have increased risk of type 2 diabetes mellitus (T2DM). Identifying relevant risk factors in IGR subjects could facilitate early detection and prevention of IGR progression to diabetes. This study investigated the association between Traditional Chinese Medicine (TCM) body constitution and serum cytokines, and whether body constitution could independently predict diabetes in IGR subjects.

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#28867378   2017/09/04 Save this To Up

Autologous fat transplants to deliver glitazone and adiponectin for vasculoprotection.

The insulin sensitizing glitazone drugs, rosiglitazone (ROS) and pioglitazone (PGZ) both have anti-proliferative and anti-inflammatory effects and induce adipose tissue (fat) to produce the vaso-protective protein adiponectin. Stenosis due to intimal hyperplasia development often occurs after placement of arteriovenous synthetic grafts used for hemodialysis. This work was performed to characterize the in vitro and in vivo effects of ROS or PGZ incorporation in fat and to determine if fat/PGZ depots could decrease vascular hyperplasia development in a porcine model of hemodialysis arteriovenous graft stenosis. Powdered ROS or PGZ (6-6000μM) was mixed with fat explants and cultured. Drug release from fat was quantified by HPLC/MS/MS, and adiponectin and monocyte chemotactic protein-1 (MCP-1) levels in culture media were measured by ELISA. The effect of conditioned media from the culture of fat with ROS or PGZ on i) platelet-derived growth factor-BB (PDGF-BB)-stimulated proliferation of human venous smooth muscle cells (SMC) was measured by a DNA-binding assay, and ii) lipopolysaccharide (LPS)-induced human monocyte release of tumor necrosis factor-alpha (TNFα) was assessed by ELISA. In a porcine model, pharmacokinetics of PGZ from fat depots transplanted perivascular to jugular vein were assessed by HPLC/MS/MS, and retention of the fat depot was monitored by MRI. A porcine model of synthetic graft placed between carotid artery and ipsilateral jugular vein was used to assess effects of PGZ/fat depots on vascular hyperplasia development. Both ROS and PGZ significantly induced the release of adiponectin and inhibited release of MCP-1 from the fat. TNF production from monocytes stimulated with LPS was inhibited 50-70% in the presence of media conditioned by fat alone or fat and either drug. The proliferation of SMC was inhibited in the presence of media conditioned by fat/ROS cultures. Fat explants placed perivascular to the external jugular vein were retained, as confirmed by MRI at one week after placement. PGZ was detected in the fat depot, in the external jugular vein wall and in adjacent tissue at clinically relevant levels, whereas levels in plasma were below detection. External jugular vein exposed to fat incorporated with PGZ had increased adiponectin expression compared to vein exposed to fat alone. However, the development of hyperplasia within the arteriovenous synthetic grafts was unchanged by treatment with fat/PGZ depots compared to no treatment.

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#28848135   2017/08/29 Save this To Up

Adiponectin Inhibits TNF-α-Activated PAI-1 Expression Via the cAMP-PKA-AMPK-NF-κB Axis in Human Umbilical Vein Endothelial Cells.

Tumor necrosis factor (TNF)-α can upregulate the expression of plasminogen activator inhibitor (PAI)-1, an inhibitor of fibrinolysis. Adiponectin (Adp) antagonizes TNF-α by negatively regulating its expression in various tissues. In the present study, the ability of Adp to suppress TNF-α-induced PAI-1 upregulation and the underlying mechanisms were evaluated.

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#28816988   2017/08/17 Save this To Up

Relationship between serum adipokine levels and radiographic progression in patients with ankylosing spondylitis: A preliminary 2-year longitudinal study.

The immunomodulatory effects of adipokines have been extensively studied in rheumatic diseases, and there is a paucity of information regarding their effects on bone metabolism.The aim of this study was to investigate the relationships between serum adipokines levels and radiographic progression over 2 years in patients with ankylosing spondylitis (AS).In this preliminary longitudinal study, we prospectively recruited 20 consecutive male patients with AS and 11 gender- and age-matched healthy subjects. At the baseline and 2-year follow-up, serum adiponectin, leptin, resistin, tumor necrosis factor-alpha (TNF-α), interleukin (IL)-6, and Dickkopf-1(DKK-1) levels were measured in AS patients using enzyme-linked immunosorbent assays; these measurements were only performed at the baseline for healthy controls. Radiographic progression was determined as the modified Stoke Ankylosing Spondylitis Spine Score (mSASSS) progression of ≥2 by comparing the baseline and 2-year follow-up radiographs.All AS patients were naive to TNF-α blockers at the enrollment and during the 2-year follow-up period and their median disease duration was 51.5 months. At the baseline, the serum resistin, TNF-α, and IL-6 levels were significantly higher in AS patients than in controls. At the 2-year follow-up, the median mSASSS of AS patients was found to be significantly increased from the baseline (8-10.5, P = .001) and 7 (35%) AS patients showed radiographic progression. In AS patients, the leptin and resistin levels were significantly higher at the 2-year follow-up than at the baseline. The baseline resistin levels and changes in leptin levels from the baseline to the 2-year follow-up were significantly higher in AS patients with radiographic progression than in those without radiographic progression (P = .002 and .024, respectively). The baseline resistin levels and the increase in leptin levels during the follow-up period significantly correlated with changes in mSASSS (ρ = 0.528 and 0.559, P = .017 and .01, respectively). No association between changes in serum adipokine levels and disease activity in AS patients was observed.Our findings suggest that leptin and resistin may contribute to the pathogenesis of new bone formation rather than to inflammatory processes and have the potential to be used as biomarkers of the structural outcome of AS.

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#28791439   2017/08/09 Save this To Up

Metabolic crosstalk between fatty pancreas and fatty liver: effects on local inflammation and insulin secretion.

Obesity-linked ectopic fat accumulation is associated with the development of type 2 diabetes. Whether pancreatic and liver steatosis impairs insulin secretion is controversial. We examined the crosstalk of human pancreatic fat cells with islets and the role of diabetogenic factors, i.e. palmitate and fetuin-A, a hepatokine released from fatty liver.

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#28786989   2017/08/08 Save this To Up

Associations between serum adipocytokines and glycemic tolerance biomarkers in a rural Chinese population.

Although experimental studies have shown that adiponectin and leptin modulate glucose tolerance and insulin resistance, it remains unclear whether these adipocytokines exert similar effects in general human populations. We evaluated the associations of serum adiponectin and leptin with β-cell function and insulin resistance in a population with low obesity prevalence. A cross-sectional study of 783 rural residents, aged 25-74 years, recruited in Ningxia, China was conducted during 2008-2012. β-cell function and insulin resistance were estimated using the Homeostasis Model Assessment. Serum adiponectin and leptin were measured with ELISA. Serum adiponectin concentrations (mean ± SD) were highest in subjects with normal glucose tolerance (36.65 ± 61.13 μg/ml), intermediate in those with impaired fasting glucose (25.92 ± 34.48 μg/ml), and lowest in those with diabetes (15.08 ± 12.14 μg/ml) (p = 0.001). A similar pattern of differences was found for β-cell function, whereas opposite results were observed for insulin resistance and blood glucose. After adjustment for confounders including metabolic syndrome components, serum adiponectin (μg/ml) was inversely associated with β-cell function (%β) [β (95% CI): -7.57 (-12.33, -2.81)] and insulin resistance (100/%S) [β (95% CI): -0.21 (-0.33, -0.09)]. A significant inverse association also existed between serum leptin and β-cell function, but serum leptin was not significantly associated with insulin resistance. The present study suggests that adiponectin and leptin play a role in the development of insulin resistance and diabetes independent of metabolic syndrome.

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#28767622   2017/08/02 Save this To Up

Adiponectin Down-regulates TNF-α Expression in Degenerated Intervertebral Discs.

Given the results of previous in vitro investigations of the expression patterns of adiponectin and its receptors in healthy and degenerated intervertebral discs (IVDs), we studied the effects of adiponectin on TNF-α production in degenerated nucleus pulposus (NP) cells and analyzed the association between adiponectin levels in IVD tissues and IVD Pfirrmann grades.

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#28743061   2017/07/25 Save this To Up

Circulating CTRP9 levels are increased in patients with newly diagnosed type 2 diabetes and correlated with insulin resistance.

C1q/TNF-related protein-9 (CTRP9) is a novel adipokine that has been shown to promote lipid metabolism, enhance insulin sensitivity and protect against cardiovascular disease. However, previous studies in humans have produced controversial results regarding the association between CTRP9 and insulin resistance. The objective of this study was to evaluate the relationships between CTRP9 and insulin resistance in Chinese population.

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