Effects of huanglian jiedu decoction on leptin and resistin in insulin resistive rats / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To study effects of Huanglian Jiedu Decoction (HJD) on lipid metabolism, leptin and resistin in insulin resistive rats.</p><p><b>METHODS</b>Type 2 diabetes mellitus (DM2) rat model was induced by intravenous injection with a low dose of streptozotocin and high fat and high caloric diet, and randomized into four groups: the model control group, the HJD group, the berberine group and the aspirin group. Meanwhile 16 normal rats were assigned as the normal control group. The body weight was observed before and after treatment, total cholesterol (TC), triglycerides (TG), high density lipoprotein-cholesterol (HDL-C), apolipoprotein A1 and B (apoA1, apoB), free fatty acid (FFA), insulin (INS) in serum, skeletal muscle triglyceride (mTG) in skeletal muscle, and oral glucose tolerance test (OGTT) and fasting blood glucose (FBG) were detected after 10 weeks of treatment, at the same time, serum levels of leptin and resistin were determined using ELLISA.</p><p><b>RESULTS</b>The levels of TC, TG, apoB, FBG, FFA, mTG, leptin and resistin were obviously lowered, the levels of HDL-C and apoA1 significantly raised, glucose tolerance improved and body weight reduced in insulin resistive rats, as compared with the model control (P<0.05, P<0.01).</p><p><b>CONCLUSION</b>The effects of HJD in lowering lipids, as well as reducing leptin and resistin might be closely correlated with its effects in ameliorating insulin resistance.</p>

Effects of huanglian jiedu decoction on signal transduction of insulin receptor and insulin receptor substrate in adipose tissue of insulin resistant rats / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To investigate the effects of Huanglian Jiedu decoction (HLJD) on protein expressions and tyrosine phosphorylation levels of insulin receptor (InsR) and insulin receptor substrate-1 (IRS-1) in adipose tissue of insulin resistant (IR) rats, and explore its possible molecular mechanism in improving IR.</p><p><b>METHODS</b>IR model was induced by intravenous injection of a small dose of streptozotocin combined with high fat and caloricity diet feeding in Wistar rats. And the model rats in the testing group were treated with HJD for 10 weeks. Fasting serum glucose and insulin were determined, and protein expressions and tyrosine phosphorylation levels of InsR and IRS-1 in adipose tissue of epididymides were detected by immunoprecipitation and Western blot.</p><p><b>RESULTS</b>The protein expression of IRS-1 and the tyrosine phosphorylation levels of InsR and IRS-1 increased significantly in model rats treated with HLJD, compared with those in the untreated model rats.</p><p><b>CONCLUSION</b>HLJD could increase the tyrosine phosphorylation levels of InsR and IRS-1 in adipose tissue in IR rats, which maybe one of its mechanisms in lowering blood glucose and improving insulin sensitivity of the target tissues.</p>