Serum irisin levels in polycystic ovary syndrome after ovarian drilling

BackgroundMany cases of Poly-Cystic Ovary Syndrome (PCOS) are overweight and presenting with insulin resistance.Main objectivewas to evaluate the effects of ovarian drilling on the serum levels of Irisin in women with polycystic ovaries.Study design and settingSerum Irisin levels were investigated in 100 cases with PCOS before ovarian drilling and 3 months after drilling, and in 80 control cases. Serum Irisin, hormonal profile and HOMA-IR were estimated in PCOS cases before and after ovarian drilling. Statistical analysis was performed by using Statistical Package for Social Scientists (SPSS).ResultsThe serum irisin levels in overweight and in normal weight PCOS cases before ovarian drilling were significantly higher as compared with the corresponding control cases. Fasting serum Irisin levels were found to be significantly elevated in PCOS patients before ovarian drilling as compared to the levels after drilling. The serum irisin levels in overweight and in normal weight PCOS cases before ovarian drilling were found to be significantly positively correlated with BMI, insulin levels, and HOMA-IR.ConclusionElevated serum Irisin levels in PCOS may contribute to the development of insulin resistance. Ovarian drilling for polycystic ovaries results in a significant decrease in the serum Irisin levels. The analysis of ROC curves may suggest that serum Irisin may be a valuable biomarker for diagnosis and for monitoring cases with PCOS during treatment.     

Irisin attenuates intestinal injury,oxidative and endoplasmic reticulum stress in mice with L-arginine-induced acute pancreatitis

BACKGROUND Acute pancreatitis(AP) is often associated with intestinal injury,which in turn exaggerates the progression of AP.Our recent study has shown that a low level of serum irisin,a novel exercise-induced hormone,is associated with poor outcomes in patients with AP and irisin administration protects against experimental AP.However,the role of irisin in intestinal injury in AP has not been evaluated.AIM To investigate the effect of irisin administration on intestinal injury in experimental AP.METHODS AP was induced in male adult mice by two hourly intraperitoneal injections of Larginine.At 2 h after the last injection of L-arginine,irisin(50 or 250 μg/kg body weight) or 1 m L normal saline(vehicle) was administered through intraperitoneal injection.The animals were sacrificed at 72 h after the induction of AP.Intestinal injury,apoptosis,oxidative and endoplasmic reticulum(ER) stress were evaluated.RESULTS Administration of irisin significantly mitigated intestinal damage,reduced apoptosis,and attenuated oxidative and ER stress in AP mice.In addition,irisin treatment also effectively downregulated serum tumor necrosis factor-alpha and interleukin-6 levels and alleviated injury in the pancreas,liver and lung of AP mice.CONCLUSION Irisin-mediated multiple physiological events attenuate intestinal injury following an episode of AP.Irisin has a great potential to be further developed as an effective treatment for patients with AP.     

多囊卵巢综合征患者血清irisin水平测定及其意义

目的：Irisin能够提高胰岛素敏感性,改善胰岛素抵抗。本研究测定多囊卵巢综合征（polycystic ovary syndrome,PCOS）患者血清irisin水平,初步探讨其临床意义。方法：选择2014年7月-2016年2月于湖北医药学院附属东风医院（我院）中医科就诊的80例PCOS患者（PCOS组）和同期于我院体检中心体检的60例月经周期规律的健康体检者（对照组）作为研究对象。2组研究对象均接受体格检查以及血脂、性激素各项指标及血清irisin水平检测,对以上指标进行组间比较及相关性分析。此外,根据体质量指数（BMI）将PCOS患者分为肥胖组和非肥胖组,并进一步比较2组间上述指标的差异。结果：①PCOS组irisin、睾酮（T）、黄体生成激素（LH）、总胆固醇（TC）水平以及BMI、腰臀比（WHR）高于对照组,高密度脂蛋白胆固醇（HDL-c）、雌二醇（E2）水平低于对照组,差异有统计学意义（均P＜0.05）;在剔除其他指标影响后,PCOS患者血清irisin水平与雄激素水平、BMI呈正相关（r=0.476,P＜0.001;r=0.329,P=0.041）。②PCOS肥胖组三酰甘油（TG）水平高于PCOS非肥胖组,差异有统计学意义（P=0.028）;PCOS肥胖组irisin水平虽略高于PCOS非肥胖组,但差异无统计学意义（P=0.087）。结论：PCOS患者血清irisin水平较正常女性显著升高,且与雄激素、BMI呈正相关;提示irisin可能与PCOS发生相关。     

MHD患者血清鸢尾素及SOST水平与心脏瓣膜钙化的关系

目的 探讨血清鸢尾素及骨硬化蛋白(SOST)水平与维持性血液透析(MHD)患者心脏瓣膜钙化(CVC)的关系.方法 选择2020年01月～2020年12月于西南医科大学附属医院肾病内科血液透析室行MHD的患者150例.收集患者临床资料,采用心脏彩色多普勒超声检查评估患者是否发生CVC,采用酶联免疫吸附(ELISA)法检测...     

Enhanced thermogenic program by non-viral delivery of combinatory browning genes to treat diet-induced obesity in mice

Thermogenic program (also known as browning) is a promising and attractive anti-obesity approach. Islet amyloid polypeptide (IAPP) and irisin have emerged as potential browning hormones that hold high potential to treat obesity. Here, we have constructed a dual browning gene system containing both IAPP and irisin (derived from fibronectin type III domain containing 5; FNDC5) combined with 2A and furin self-cleavage sites. Intraperitoneal administration of the construct complexed with a linear polyethylenimine into diet-induced obese mice demonstrated the elevation of anti-obesogenic effects characterized as the decreased body weight, adiposity, and levels of glucose and insulin. In addition, the construct delivery increased energy expenditure and the expression of core molecular determinants associated with browning. The additional advantages of the dual browning gene construct delivery compared to both single gene construct delivery and dual peptide delivery can be emphasized on efficacy and practicability. Hence, we have concluded that dual browning gene delivery makes it therapeutically attractive for diet-induced obesity treatment.     

血清鸢尾素与2型糖尿病肾病的相关性研究

目的：探讨2型糖尿病（T2DM）患者血清鸢尾素（Irisin）与糖尿病肾病（DN）的相关性。方法选取新诊断的40例单纯T2DM患者（SDM组）、41例T2DM早期肾病患者（EDN组）、42例T2DM临床肾病患者（CDN组）,同时选取40例体检健康者为对照组（NC组）,采用酶联免疫吸附试验（ELISA）测定空腹血清Irisin水平。结果（1）4组血清Irisin水平由高到低依次为：NC组（320．48±107．03）ng／mL、SDM组（291．53±101．01）ng／mL、EDN 组（278．54±93．48）ng／mL、CDN组（209．12±88．53） ng／mL ,差异有统计学意义（P＜0．05）;（2）血清Irisin水平与胰岛素抵抗指数（HOMA‐IR）,空腹胰岛素（FINS）、空腹血糖（FPG）、糖化血红蛋白（HbA1c）、血肌酐（Scr）、尿素氮（BUN）、肿瘤坏死因子‐α（TNF‐α）水平及尿清蛋白／肌酐（UAlb／Cr）比值呈负相关（r值分别为－0．592、－0．610、－0．614、－0．638、－0．538、－0．552、－0．589、－0．561,P＜0．05）,与超氧化物歧化酶（SOD）、高密度脂蛋白（HDL）水平呈正相关（r值为0．578、0．556,P＜0．05）;（3）回归分析显示：HOMA‐IR、UAlb／Cr是Irisin的独立影响因素。结论 DN患者血清Irisin水平降低,血清Irisin与DN的严重程度相关。     

Irisin与糖脂代谢性疾病的研究进展

Irisin是一种新发现的肌肉因子,其前体物质为Ⅲ型纤连蛋白结构域5(FNDC5)。运动使骨骼肌中的过氧化物酶体增殖活化受体γ(PPARγ)辅助激活因子1α(PCG-1α)的表达增加,PCG-1α能诱导FNDC5表达,FNDC5断裂后可形成分泌性的肌肉因子Irisin,从而诱导白色脂肪棕色化,导致能量消耗增多,体质量减轻,改善糖耐量和胰岛素抵抗,调节糖脂代谢和能量代谢。因此,Irisin有望成为治疗糖脂代谢性疾病的新靶点。本文对Irisin与糖脂代谢性疾病的相关性研究进行综述。     

The role of irisin in metabolic flexibility: Beyond adipose tissue browning

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Irisin,an exercise-induced bioactive peptide beneficial for health promotion during aging process

Irisin is an exercise-induced myokine expressed as a bioactive peptide in multiple tissues and organs, and exercise and cold exposure are the major inducers for its secretion. Irisin presents a decreasing trend with the extension of age and is also closely associated with a wide range of aging-related diseases. Currently, many studies on irisin are being conducted with respect to physiological functions for health promotion, and the prevention, treatment and rehabilitation of chronic diseases, as well as mechanisms associated with improving energy metabolic balance, enhancing cellular homeostasis by optimizing autophagy, promoting mitochondrial quality control, reducing reactive oxygen species (ROS) production, and mitigating inflammatory responses. These diseases include: metabolic diseases (obesity, type 2 diabetes, and bone metabolism); cardiovascular diseases (hypertension, coronary heart disease, cardiomyopathy and stroke); nervous system diseases (Alzheimer's disease, Parkinson's disease, and stroke); and others (cancer and sarcopenia). Although the current studies on irisin are relatively extensive, some studies have produced unexplained experimental results. This article introduces an overview of the generation, secretion, and tissue distribution, of irisin, and its targeting of tissues or organs for the prevention and treatment of above-mentioned chronic diseases is systematically summarized, with discussion of the underlying molecular mechanisms. This study is expected to improve the understanding of irisin, which may be beneficial to identify novel and effective targets for the screening, diagnosis, or therapy of these chronic diseases, or develop promising interventional strategies, effective drug candidates, functional foods, or exercise mimetics.