Irisin is a polypeptide hormone derived from the proteolytic cleavage of fibronectin-type III domain- containing 5 （FNDC5） protein. Once released to circulation upon exercise or cold exposure, irisin stimulates brow...Irisin is a polypeptide hormone derived from the proteolytic cleavage of fibronectin-type III domain- containing 5 （FNDC5） protein. Once released to circulation upon exercise or cold exposure, irisin stimulates browning of white adipose tissue （WAT） and uncoupling protein I （UCP1） expression, leading to an increase in total body energy expenditure by augmented UCPl-mediated thermogenesis. It is currently unknown whether irisin is secreted by bone upon exercise or whether it regulates bone metabolism in vivo. In this study, we found that 2 weeks of voluntary wheel-running exercise induced high levels of FNDC5 messenger RNA as well as FNDC5/irisin protein expression in murine bone tissues. Increased immunoreactivity due to exercise-induced FNDC5/irisin expression was detected in different regions of exercised femoral bones, including growth plate, trabecular bone, cortical bone, articular cartilage, and bone-tendon interface. Exercise also increased expression of osteogenic markers in bone and that of UCP1 in WAT, and led to bodyweight loss. Irisin intraperitoneal （IP） administration resulted in increased trabecular and cortical bone thickness and osteoblasts numbers, and concurrently induced UCP1 expression in subcutaneous WAT. Lentiviral FNDC5 IP administration increased cortical bone thickness. In vitro studies in bone cells revealed irisin increases osteoblastogenesis and mineralization, and inhibits receptor activator of nuclear factor-kB ligand （RANKL）- induced osteoclastogenesis. Taken together, our findings show that voluntary exercise increases irisin production in bone, and that an increase in circulating irisin levels enhances osteogenesis in mice.展开更多
目的:探索鸢尾素(Irisin)对动脉粥样硬化的作用及其可能机制。方法:建立载脂蛋白E基因敲除(Apo E-/-)小鼠糖尿病模型(n=20)并分为鸢尾素组(n=10)、糖尿病对照组(n=10),同时设立空白对照组(n=10),分别静脉注射鸢尾素或等量生理盐水。鸢...目的:探索鸢尾素(Irisin)对动脉粥样硬化的作用及其可能机制。方法:建立载脂蛋白E基因敲除(Apo E-/-)小鼠糖尿病模型(n=20)并分为鸢尾素组(n=10)、糖尿病对照组(n=10),同时设立空白对照组(n=10),分别静脉注射鸢尾素或等量生理盐水。鸢尾素干预4周后,测定血管内皮依赖性舒张功能。干预12周后,检测血清肿瘤坏死因子-α(TNF-α)、C-反应蛋白、白细胞介素-6(IL-6)及氧化低密度脂蛋白等炎性因子水平;油红O及苏木素伊红(HE)染色分析主动脉粥样斑块表面积及横断面积;抗CD68和抗CD90免疫组化染色测定斑块巨噬细胞及T淋巴细胞浸润;实时定量聚合酶链式反应(RT-PCR)分析主动脉壁IL-6、白细胞介素-10、TNF-α等炎性因子信使核糖核酸(m RNA)转录水平。结果:鸢尾素组与糖尿病对照组相比,小鼠内皮依赖性舒张功能改善,血中炎性因子水平降低,粥样斑块表面积[(22.57±2.17)%vs(35.09±2.38)%,P<0.05]及横断面积[(19.36±1.85)%vs(25.53±7.87)%,P<0.05]减小,斑块巨噬细胞[(30.5±2.79)%vs(41.34±9.13)%]、T淋巴细胞[(28.11±4.24)%vs(35.79±9.11)%]浸润减少,主动脉壁炎性因子m RNA转录水平下降[IL-6:1.76±0.50 vs 3.78±1.15;TNF-α:1.05±0.30 vs 2.11±0.48;细胞内黏附分子-1:1.96±0.69 vs 2.71±0.72;血管细胞黏附分子-1:0.87±0.21 vs 1.45±0.25;单核细胞趋化蛋白-1:1.34±0.34 vs 1.77±0.55],差异有统计学意义(P<0.05)。结论:鸢尾素可改善Apo E-/-糖尿病小鼠动脉粥样硬化,内皮保护及抗炎反应是其保护血管的重要机制。鸢尾素具有潜在的防治动脉粥样硬化的临床价值。展开更多
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,...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 250μg/kg body weight)or 1 mL 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.展开更多
基金supported by a R01DE21464 through the National Institutes of Healthan Innovation in Oral Care Award through International Association for Dental Research and Glaxo Smith Kline Consumer Healthcare+2 种基金an Award through International Team of Implantology to JCby GZUCM Science Fund for Creative Research Groups(2016KYTD10)GZUCM Torch Program(A1-AFD015142Z08)to JZ
文摘Irisin is a polypeptide hormone derived from the proteolytic cleavage of fibronectin-type III domain- containing 5 （FNDC5） protein. Once released to circulation upon exercise or cold exposure, irisin stimulates browning of white adipose tissue （WAT） and uncoupling protein I （UCP1） expression, leading to an increase in total body energy expenditure by augmented UCPl-mediated thermogenesis. It is currently unknown whether irisin is secreted by bone upon exercise or whether it regulates bone metabolism in vivo. In this study, we found that 2 weeks of voluntary wheel-running exercise induced high levels of FNDC5 messenger RNA as well as FNDC5/irisin protein expression in murine bone tissues. Increased immunoreactivity due to exercise-induced FNDC5/irisin expression was detected in different regions of exercised femoral bones, including growth plate, trabecular bone, cortical bone, articular cartilage, and bone-tendon interface. Exercise also increased expression of osteogenic markers in bone and that of UCP1 in WAT, and led to bodyweight loss. Irisin intraperitoneal （IP） administration resulted in increased trabecular and cortical bone thickness and osteoblasts numbers, and concurrently induced UCP1 expression in subcutaneous WAT. Lentiviral FNDC5 IP administration increased cortical bone thickness. In vitro studies in bone cells revealed irisin increases osteoblastogenesis and mineralization, and inhibits receptor activator of nuclear factor-kB ligand （RANKL）- induced osteoclastogenesis. Taken together, our findings show that voluntary exercise increases irisin production in bone, and that an increase in circulating irisin levels enhances osteogenesis in mice.
文摘目的:探索鸢尾素(Irisin)对动脉粥样硬化的作用及其可能机制。方法:建立载脂蛋白E基因敲除(Apo E-/-)小鼠糖尿病模型(n=20)并分为鸢尾素组(n=10)、糖尿病对照组(n=10),同时设立空白对照组(n=10),分别静脉注射鸢尾素或等量生理盐水。鸢尾素干预4周后,测定血管内皮依赖性舒张功能。干预12周后,检测血清肿瘤坏死因子-α(TNF-α)、C-反应蛋白、白细胞介素-6(IL-6)及氧化低密度脂蛋白等炎性因子水平;油红O及苏木素伊红(HE)染色分析主动脉粥样斑块表面积及横断面积;抗CD68和抗CD90免疫组化染色测定斑块巨噬细胞及T淋巴细胞浸润;实时定量聚合酶链式反应(RT-PCR)分析主动脉壁IL-6、白细胞介素-10、TNF-α等炎性因子信使核糖核酸(m RNA)转录水平。结果:鸢尾素组与糖尿病对照组相比,小鼠内皮依赖性舒张功能改善,血中炎性因子水平降低,粥样斑块表面积[(22.57±2.17)%vs(35.09±2.38)%,P<0.05]及横断面积[(19.36±1.85)%vs(25.53±7.87)%,P<0.05]减小,斑块巨噬细胞[(30.5±2.79)%vs(41.34±9.13)%]、T淋巴细胞[(28.11±4.24)%vs(35.79±9.11)%]浸润减少,主动脉壁炎性因子m RNA转录水平下降[IL-6:1.76±0.50 vs 3.78±1.15;TNF-α:1.05±0.30 vs 2.11±0.48;细胞内黏附分子-1:1.96±0.69 vs 2.71±0.72;血管细胞黏附分子-1:0.87±0.21 vs 1.45±0.25;单核细胞趋化蛋白-1:1.34±0.34 vs 1.77±0.55],差异有统计学意义(P<0.05)。结论:鸢尾素可改善Apo E-/-糖尿病小鼠动脉粥样硬化,内皮保护及抗炎反应是其保护血管的重要机制。鸢尾素具有潜在的防治动脉粥样硬化的临床价值。
基金Supported by the National Natural Science Foundation of China,No.81770491
文摘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 250μg/kg body weight)or 1 mL 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.
