scholarly journals Phospholipid Derivatives of Cinnamic Acid Restore Insulin Sensitivity in Insulin Resistance in 3T3-L1 Adipocytes

Nutrients ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 3619
Author(s):  
Małgorzata Małodobra-Mazur ◽  
Dominika Lewoń ◽  
Aneta Cierzniak ◽  
Marta Okulus ◽  
Anna Gliszczyńska
Keyword(s):  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Glucose Uptake ◽  
Cinnamic Acid ◽  
Insulin Response ◽  
Aromatic Acids ◽  
Insulin Resistant ◽  
Beneficial Effects ◽  
First Choice ◽  
Derivatives Of

Background: Insulin resistance (IR) is a condition in which the physiological amount of insulin is insufficient to evoke a proper response of the cell, that is, glucose utilization. Metformin is the first choice for therapy, thanks to its glycemic efficacy and general tolerability. In addition, various natural compounds from plant extracts, spices, and essential oils have been shown to provide health benefits regarding insulin sensitivity. In the present study, we analyzed the effect of phospholipid derivatives of selected natural aromatic acids on insulin action and their potential use to overcome insulin resistance. Methods: The 3T3-L1 fibroblasts were differentiated into mature adipocytes; next, insulin resistance was induced by palmitic acid (16:0). Cells were further cultured with phenophospholipids at appropriate concentrations. To assess insulin sensitivity, we measured the insulin-stimulated glucose uptake, using a glucose uptake test. Results: We showed that cinnamic acid (CA) and 3-methoxycinnamic acid (3-OMe-CA) restored the proper insulin response. However, 1,2-dicinnamoyl-sn-glycero-3-phosphocholine (1,2-diCA-PC) and 1-cinnamoyl-2-palmitoyl-sn-glycero-3-phosphocholine (1-CA-2-PA-PC) improved insulin sensitivity in insulin-resistant adipocytes even stronger, exhibiting more beneficial effects. Conclusions: The binding of aromatic acids to phosphatidylcholine increases their beneficial effect on insulin sensitivity in adipocytes and expands their potential practical application as nutraceutical health-promoting agents.

Saturated, but not n-6 polyunsaturated, fatty acids induce insulin resistance: role of intramuscular accumulation of lipid metabolites

2006 ◽  
Vol 100 (5) ◽  
pp. 1467-1474 ◽  
Author(s):  
Jong Sam Lee ◽  
Srijan K. Pinnamaneni ◽  
Su Ju Eo ◽  
In Ho Cho ◽  
Jae Hwan Pyo ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Skeletal Muscle ◽  
Fatty Acids ◽  
Insulin Sensitivity ◽  
Polyunsaturated Fatty Acids ◽  
Glucose Uptake ◽  
High Fat ◽  
Insulin Resistant ◽  
L6 Myotubes ◽  
Lipid Metabolites

Consumption of a Western diet rich in saturated fats is associated with obesity and insulin resistance. In some insulin-resistant phenotypes this is associated with accumulation of skeletal muscle fatty acids. We examined the effects of diets high in saturated fatty acids (Sat) or n-6 polyunsaturated fatty acids (PUFA) on skeletal muscle fatty acid metabolite accumulation and whole-body insulin sensitivity. Male Sprague-Dawley rats were fed a chow diet (16% calories from fat, Con) or a diet high (53%) in Sat or PUFA for 8 wk. Insulin sensitivity was assessed by fasting plasma glucose and insulin and glucose tolerance via an oral glucose tolerance test. Muscle ceramide and diacylglycerol (DAG) levels and triacylglycerol (TAG) fatty acids were also measured. Both high-fat diets increased plasma free fatty acid levels by 30%. Compared with Con, Sat-fed rats were insulin resistant, whereas PUFA-treated rats showed improved insulin sensitivity. Sat caused a 125% increase in muscle DAG and a small increase in TAG. Although PUFA also resulted in a small increase in DAG, the excess fatty acids were primarily directed toward TAG storage (105% above Con). Ceramide content was unaffected by either high-fat diet. To examine the effects of fatty acids on cellular lipid storage and glucose uptake in vitro, rat L6 myotubes were incubated for 5 h with saturated and polyunsaturated fatty acids. After treatment of L6 myotubes with palmitate (C16:0), the ceramide and DAG content were increased by two- and fivefold, respectively, concomitant with reduced insulin-stimulated glucose uptake. In contrast, treatment of these cells with linoleate (C18:2) did not alter DAG, ceramide levels, and glucose uptake compared with controls (no added fatty acids). Both 16:0 and 18:2 treatments increased myotube TAG levels (C18:2 vs. C16:0, P < 0.05). These results indicate that increasing dietary Sat induces insulin resistance with concomitant increases in muscle DAG. Diets rich in n-6 PUFA appear to prevent insulin resistance by directing fat into TAG, rather than other lipid metabolites.

Abstract 308: Rgs2 Is An Endogenous Inhibitor Of Insulin Signaling

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Prem Sharma ◽  
Jennie Bever ◽  
Scott Heximer ◽  
Carmen Dessauer ◽  
Jerrold M Olefsky
Keyword(s):  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Glucose Uptake ◽  
Insulin Signaling ◽  
Regulatory System ◽  
Heart Association ◽  
Glut4 Translocation ◽  
Wild Type ◽  
Akt Phosphorylation ◽  
Insulin Resistant

Background: Insulin resistance is the hallmark of type 2 diabetes and is a known risk factor for the development of cardiovascular diseases. We have determined that overexpression of a GTPase-activating protein, RGS2 decreases insulin sensitivity. This study describes RGS2 regulation of insulin signaling pathways in order to assess whether this information can be used to reverse insulin insensitivity in diabetes. Hypothesis, Methods and Results: RGS2 protein levels were elevated 3 to 5-fold in white adipose tissues from ob/ob and high fat diet induced Insulin Resistant mice. Further, RGS2 protein is elevated in insulin resistant 3T3-L1 adipocytes treated chronically with either insulin, ET-1, or TNF-aplha. Further, SiRNA knockdown of endogenous RGS2 protein increases basal, insulin independent and insulin-dependent GLUT4 translocation. We hypothesized that the RGS2 regulatory system is defective/overactive in insulin resistance, and that a modulation of this regulatory system by RGS2 inhibition would improve insulin sensitivity. Thus, we determined the mechanisms whereby RGS2 modulates insulin sensitivity in 3T3-L1 adipocytes; focusing on insulin-regulated G-protein/PI3-K pathways leading to GLUT4 translocation and glucose uptake; utilizing adenoviruses over-expressing wild-type and mutants RGS2, as well as by siRNA-mediated knock down of endogenous RGS2. We overexpressed the Wild-Type (WT), GTPase defective (GD), and plasma membrane translocation defective (TD) RGS2 proteins in 3T3-L1 adipocytes. Overexpression of WT RGS2 leads to ~ 50% inhibition of insulin induced 2-DOG uptake, without affecting IR Tyr phosphorylation. RGS2 constitutively associates with Galpha/q11, and prevent its Tyr phosphorylation and activation by insulin. Interestingly, insulin-stimulated PKClambda phosphorylation was completely blocked by RGS2, whereas, AKT phosphorylation was minimally inhibited. Neither the insulin receptor tyrosine phosphorylation nor insulin-stimulated MAPK phosphorylation was affected by RGS2. Conclusion: This study identifies a novel role of RGS2 in cellular insulin resistance by negatively regulating signaling through the Galpha/q11 pathway to glucose uptake. This research has received full or partial funding support from the American Heart Association, AHA Western States Affiliate (California, Nevada & Utah).

scholarly journals Exosomes Derived from Human Umbilical Cord Mesenchymal Stem Cells Enhance Insulin Sensitivity in Insulin Resistant Human Adipocytes

2021 ◽  
Vol 41 (1) ◽  
pp. 87-93
Author(s):  
Mei-ting Chen ◽  
Yi-ting Zhao ◽  
Li-yuan Zhou ◽  
Ming Li ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Insulin Sensitivity ◽  
Glucose Uptake ◽  
Umbilical Cord ◽  
Sirtuin 1 ◽  
Human Umbilical Cord ◽  
Human Adipocytes ◽  
Insulin Resistant

SummaryInsulin resistance is an essential characteristic of type 2 diabetes mellitus (T2DM), which can be induced by glucotoxicity and adipose chronic inflammation. Mesenchymal stem cells (MSCs) and their exosomes were reported to ameliorate T2DM and its complications by their immunoregulatory and healing abilities. Exosomes derived from MSCs contain abundant molecules to mediate crosstalk between cells and mimic biological function of MSCs. But the role of exosomes derived from human umbilical cord mesenchymal stem cells (hUC-MSCs) in insulin resistance of human adipocytes is unclear. In this study, exosomes were harvested from the conditioned medium of hUC-MSCs and added to insulin-resistant adipocytes. Insulin-stimulated glucose uptake was measured by glucose oxidase/peroxidase assay. The signal pathway involved in exosome-treated adipocytes was detected by RT-PCR and Western blotting. The biological characteristics and function were compared between hUC-MSCs and human adipose-derived mesenchymal stem cells (hAMSCs). The results showed that hAMSCs had better adipogenic ability than hUC-MSCs. After induction of mature adipocytes by adipogenesis of hAMSC, the model of insulin-resistant adipocytes was successfully established by TNF-α and high glucose intervention. After exosome treatment, the insulin-stimulated glucose uptake was significantly increased. In addition, the effect of exosomes could be stabilized for at least 48 h. Furthermore, the level of leptin was significantly decreased, and the mRNA expression of sirtuin-1 and insulin receptor substrate-1 was significantly upregulated after exosome treatment. In conclusion, exosomes significantly improve insulin sensitivity in insulin-resistant human adipocytes, and the mechanism involves the regulation of adipokines.

scholarly journals Improvement of high-glucose and insulin resistance of chromium malate in 3T3-L1 adipocytes by glucose uptake and insulin sensitivity signaling pathways and its mechanism

RSC Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 114-127 ◽  
Author(s):  
Weiwei Feng ◽  
Yongchao Liu ◽  
Fan Fei ◽  
Yao Chen ◽  
Yangyang Ding ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Mrna Expression ◽  
Glucose Uptake ◽  
High Glucose ◽  
Mrna Levels ◽  
Related Protein ◽  
Model Group ◽  
Insulin Resistant ◽  
Chromium Malate

Chromium malate could increase the related protein and mRNA levels in 3T3-L1 adipocytes with insulin resistant. Pretreatment with the inhibitor completely/partially inhibited the GLUT-4 and Irs-1 proteins and mRNA expression compared to model group.

scholarly journals Impaired adipose expansion caused by liver X receptor activation is associated with insulin resistance in mice fed a high-fat diet

2017 ◽  
Vol 58 (3) ◽  
pp. 141-154 ◽  
Author(s):  
Yueting Dong ◽  
Zhiye Xu ◽  
Ziyi Zhang ◽  
Xueyao Yin ◽  
Xihua Lin ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Glucose Uptake ◽  
High Fat Diet ◽  
Insulin Response ◽  
Receptor Activation ◽  
Metabolic Effects ◽  
Whole Body ◽  
High Fat ◽  
Epididymal Fat

Liver X receptors (LXR) are deemed as potential drug targets for atherosclerosis, whereas a role in adipose tissue expansion and its relation to insulin sensitivity remains unclear. To assess the metabolic effects of LXR activation by the dual LXRα/β agonist T0901317, C57BL/6 mice fed a high-fat diet (HFD) were treated with T0901317 (30 mg/kg once daily by intraperitoneal injection) for 3 weeks. Differentiated 3T3-L1 adipocytes were used for analysing the effect of T0901317 on glucose uptake. The following results were obtained from this study. T0901317 reduced fat mass, accompanied by a massive fatty liver and lower serum adipokine levels in HFD mice. Increased adipocyte apoptosis was found in epididymal fat of T0901317-treated HFD mice. In addition, T0901317 treatment promoted basal lipolysis, but blunted the anti-lipolytic action of insulin. Furthermore, LXR activation antagonised PPARγ target genes in epididymal fat and PPARγ-PPRE-binding activity in 3T3-L1 adipocytes. Although the glucose tolerance was comparable to that in HFD mice, the insulin response during IPGTT was significantly higher and the insulin tolerance was significantly impaired in T0901317-treated HFD mice, indicating decreased insulin sensitivity by T0901317 administration, and which was further supported by impaired insulin signalling found in epididymal fat and decreased insulin-induced glucose uptake in 3T3-L1 adipocytes by T0901317 administration. In conclusion, these findings reveal that LXR activation impairs adipose expansion by increasing adipocyte apoptosis, lipolysis and antagonising PPARγ-mediated transcriptional activity, which contributes to decreased insulin sensitivity in whole body. The potential of LXR activation being a therapeutic target for atherosclerosis might be limited by the possibility of exacerbating insulin resistance.

scholarly journals Adipose tissue and skeletal muscle insulin-mediated glucose uptake in insulin resistance: role of blood flow and diabetes

2018 ◽  
Vol 108 (4) ◽  
pp. 749-758 ◽  
Author(s):  
Ele Ferrannini ◽  
Patricia Iozzo ◽  
Kirsi A Virtanen ◽  
Miikka-Juhani Honka ◽  
Marco Bucci ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Skeletal Muscle ◽  
Blood Flow ◽  
Adipose Tissue ◽  
Insulin Sensitivity ◽  
Glucose Uptake ◽  
Blood Supply ◽  
Insulin Resistant ◽  
Femoral Muscle

Abstract Background Adipose tissue glucose uptake is impaired in insulin-resistant states, but ex vivo studies of human adipose tissue have yielded heterogeneous results. This discrepancy may be due to different regulation of blood supply. Objective The aim of this study was to test the flow dependency of in vivo insulin-mediated glucose uptake in fat tissues, and to contrast it with that of skeletal muscle. Design We reanalyzed data from 159 individuals in which adipose tissue depots—subcutaneous abdominal and femoral, and intraperitoneal—and femoral skeletal muscle were identified by MRI, and insulin-stimulated glucose uptake ([18F]-fluoro-2-deoxyglucose) and blood flow ([15O]-H2O) were measured simultaneously by positron emission tomography scanning. Results Individuals in the bottom tertile of whole-body glucose uptake [median (IQR) 36 (17) µmol. kg fat-free mass (kgFFM)−1 . min−1 .nM−1] displayed all features of insulin resistance compared with the rest of the group [median (IQR) 97 (71) µmol . kgFFM−1 .min−1 . nM−1]. Rates of glucose uptake were directly related to the degree of insulin resistance in all fat depots as well as in skeletal muscle. However, blood flow was inversely related to insulin sensitivity in each fat depot (all P ≤ 0.03), whereas femoral muscle blood flow was not significantly different between insulin-resistant and insulin-sensitive subjects, and was not related to insulin sensitivity. Furthermore, in subjects performing one-leg exercise, blood flow increased 5- to 6-fold in femoral muscle but not in the overlying adipose tissue. The presence of diabetes was associated with a modest increase in fat and muscle glucose uptake independent of insulin resistance. Conclusions Reduced blood supply is an important factor for the impairment of in vivo insulin-mediated glucose uptake in both subcutaneous and visceral fat. In contrast, the insulin resistance of glucose uptake in resting skeletal muscle is predominantly a cellular defect. Diabetes provides a modest compensatory increase in fat and muscle glucose uptake that is independent of insulin resistance.

scholarly journals Pioglitazone does not improve insulin signaling in mice with GH over-expression

2013 ◽  
Vol 219 (2) ◽  
pp. 109-117 ◽  
Author(s):  
Adam Gesing ◽  
Andrzej Bartke ◽  
Michal M Masternak
Keyword(s):  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Insulin Signaling ◽  
Mammalian Target Of Rapamycin ◽  
Sensitivity Index ◽  
Peroxisome Proliferator ◽  
Peroxisome Proliferator Activated Receptor ◽  
Over Expression ◽  
Insulin Resistant ◽  
Beneficial Effects

Type 2 diabetes and obesity are very serious health problems in both developed and developing countries. An increased level of GH is known to promote insulin resistance. Transgenic (Tg) mice over-expressing bovine GH are short-living and characterized, among other traits, by hyperinsulinemia and increased insulin resistance in comparison with normal (N) mice. Pioglitazone (PIO) is a member of the thiazolidinediones – a group of insulin-sensitizing drugs that are selective agonists of peroxisome proliferator-activated receptor gamma (PPARγ). The aim of the study was to analyze the effects of PIO on the insulin-signaling pathway in Tg and N mice. Plasma levels of insulin and glucose as well as hepatic levels of proteins involved in insulin signaling were analyzed by ELISA or western blot methods. Treatment with PIO decreased plasma level of glucose in N mice only. Similarly, PIO increased insulin sensitivity (expressed as the relative insulin sensitivity index; RISI) only in N mice. In the liver, PIO decreased the phosphorylation of insulin receptor substrate-1 (IRS1) at a serine residue (Ser307-pS-IRS1), which inhibits insulin action, and had a tendency to increase tyrosine phosphorylation of IRS2 (Tyr-pY-IRS2) only in N mice but did not affect either of these parameters in Tg mice. Levels of total and phosphorylated mammalian target of rapamycin were increased in Tg mice. Moreover, the level of AKT2 was decreased by PIO in N mice only. In conclusion, the lack of improvement of insulin sensitivity in insulin-resistant Tg mice during PIO treatment indicates that chronically elevated GH levels can inhibit the beneficial effects of PIO on insulin signaling.

scholarly journals Effect of carvedilol versus nebivolol on insulin resistance among non-diabetic, non-ischemic cardiomyopathy with heart failure

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Yasser Gaber Metwally ◽  
Heba Kamal Sedrak ◽  
Inass Fahiem Shaltout
Keyword(s):  
Heart Failure ◽  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Ischemic Cardiomyopathy ◽  
Diabetic Patients ◽  
Promising Strategy ◽  
Improve Insulin Resistance ◽  
First Choice ◽  
The Difference

Abstract Background Although B-blockers provide unequivocal benefits in heart failure (HF) management, some B-blockers worsen insulin resistance. It will be a promising strategy to recruit such a B blocker that did not worsen or can even improve insulin resistance (IR). So, this study aimed to assess the effect of two of the third-generation B-blockers (carvedilol versus nebivolol) on insulin sensitivity state in non-diabetic patients with non-ischemic cardiomyopathy with heart failure. Results Out of 43 patients enrolled, 58.1% represented the carvedilol group while 41.9% represented the nebivolol group. Nebivolol improves insulin resistance-related variables (fasting glucose, fasting insulin, and HOMA-IR; P < 0.001, 0.01, and 0.01 respectively). The percentage of change at homeostasis model of assessment (HOMA-IR), indicative of insulin sensitivity status, between baseline versus at 3-months follow-up level of intra-group comparison was increased by 4.58% in the carvedilol arm whereas it was decreased by 11.67% in the nebivolol arm, and the difference on the intragroup level of comparison was significant (P < 0.001 and 0.01 respectively). Conclusion Nebivolol improves insulin resistance-related variables .Nebivolol may be recommended as the B blocker of the first choice for those with non-ischemic cardiomyopathy heart failure with evident insulin resistance; however, larger scaled prospective multicenter randomized trials are needed for confirming our favorable results.

Abstract 1361: Leukocyte Antigen-Related Phosphatase Regulates Insulin Sensitivity by Interaction with Snapin

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Aleksandr E Vendrov ◽  
Igor Tchivilev ◽  
Xi-Lin Niu ◽  
Juxiang Li ◽  
Marschall S Runge ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Glucose Uptake ◽  
Glycogen Synthase ◽  
Serine Phosphorylation ◽  
Snare Complex ◽  
Vascular Pathology ◽  
Wild Type ◽  
Membrane Translocation ◽  
Leukocyte Antigen

Several protein tyrosine phosphatases including leukocyte antigen-related (LAR) phosphatase have been implicated in insulin resistance, which is a risk factor for atherosclerosis. We showed previously that LAR negatively regulates insulin-like growth factor-1 (IGF1) signaling in vascular smooth muscle cells (VSMC) leading to increased proliferation and migration. Absence of LAR also enhanced neointima formation in response to arterial injury in mice. However, the role of LAR-modulated signaling in the development of insulin resistance has not been elucidated. Here, we investigated the function of LAR in regulating glucose uptake and insulin sensitivity. We identified snapin, a SNARE-associated protein involved in glucose transporter Glut4 vesicle fusion with plasma membrane, as a LAR-interacting protein using a yeast two-hybrid screen. IGF1-induced serine phosphorylation of snapin, its translocation to membrane and association with SNARE complex were enhanced in VSMC lacking LAR. Similarly, PI3K-PDK1-PKCζ signaling pathway was more active in LAR-/- cells after IGF1 treatment. This resulted in enhanced Glut4 activation, its membrane translocation and association with snapin. Glut4 membrane translocation and association with snapin after IGF1 treatment were impaired in snapin+/− VSMC. IGF1 treatment also increased serine phosphorylation of GSK3 β in LAR−/− VSMC leading to increased activation of glycogen synthase. Consistent with this, enhanced glucose uptake was observed in LAR−/− VSMC compared to wild-type cells after IGF1 treatment. Basal and IGF1-induced glucose uptake were significantly lower in snapin+/− VSMC than in wild-type cells. Snapin+/− mice had higher levels of blood glucose, lower quantitative insulin sensitivity check index (QUICKI) and impaired response to insulin in insulin tolerance test (ITT) compared to wild-type mice. Decrease of QUICKI and impairment of IIT were more pronounced in snapin+/− mice fed a high-fat diet. In addition, Doppler ultrasonography indicated increased arterial stiffness in snapin+/− mice. Together, these data indicate that LAR negatively regulates snapin phosphorylation which in turn affects glucose uptake leading to the development of insulin resistance and vascular pathology.

Transthyretin contributes to insulin resistance and diminishes exercise-induced insulin sensitivity in obese mice by inhibiting AMPK activity in skeletal muscle

2021 ◽  
Author(s):  
Yingzi He ◽  
Ruojun Qiu ◽  
Beibei Wu ◽  
Weiwei Gui ◽  
Xihua Lin ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Inhibitory Effect ◽  
Quadriceps Femoris ◽  
Treadmill Training ◽  
C2c12 Cells ◽  
Obese Mice ◽  
Insulin Resistant ◽  
Ampk Activity ◽  
Exercise Induced

Exercise improves obesity-induced insulin resistance and metabolic disorders via mechanisms that remain unclear. Here, we show that the levels of the hepatokine transthyretin (TTR) in circulation are elevated in insulin-resistant individuals including high-fat diet (HFD)-induced obese mice, db/db mice, and patients with metabolic syndrome. Liver Ttr mRNA and circulating TTR levels were reduced in mice by treadmill training, as was the TTR levels in quadriceps femoris muscle; however, AMPK signalling activity was enhanced. Transgenic overexpression of TTR or injection of purified TTR triggered insulin resistance in mice fed on regular chow (RC). Furthermore, TTR overexpression reduced the beneficial effects of exercise on insulin sensitivity in HFD-fed mice. TTR was internalized by muscle cells via the membrane receptor Grp78 and the internalization into the quadriceps femoris was reduced by treadmill training. The TTR/Grp78 combination in C2C12 cells was increased, whereas the AMPK activity of C2C12 cells was decreased as the TTR concentration rose. Additionally, Grp78 silencing prevented the TTR internalization and reversed its inhibitory effect on AMPK activity in C2C12 cells. Our study suggests that elevated circulating TTR may contribute to insulin resistance and counteract the exercise-induced insulin sensitivity improvement; the TTR suppression might be an adaptive response to exercise through enhancing AMPK activity in skeletal muscles.

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