Background： Therapeutic angiogenesis has been shown to promote blood vessel growth and improve tissue perfusion.Nerve growth factor （NGF） has been reported to play an important role in both physiological and pathol...Background： Therapeutic angiogenesis has been shown to promote blood vessel growth and improve tissue perfusion.Nerve growth factor （NGF） has been reported to play an important role in both physiological and pathological angiogenesis.This study aimed to investigate the effects of NGF on angiogenesis and skeletal muscle fiber remodeling in a murine model of hindlimb ischemia and study the relationship between NGF and vascular endothelial growth factor （VEGF） in angiogenesis.Methods： Twenty-four mice were randomly allocated to normal control group （n =6）, blank control group （n =6）, VEGF gene transfection group （n =6）, and NGF gene transfection group （n =6）.The model of left hindlimb ischemia model was established by ligating the femoral artery.VEGF165 plasmid （125 μg） and NGF plasmid （125 μg） was injected into the ischemic gastrocnemius of mice from VEGF group and NGF group, respectively.Left hindlimb function and ischemic damage were assessed with terminal points at 21th day postischemia induction.The gastrocnemius of four groups was tested by hematoxylin-eosin staining, proliferating cell nuclear antigen and CD34 immunohistochemistry staining, and myosin ATPase staining.NGF and VEGF protein expression was detected by enzyme-linked immunosorbent assay.Results： On the 21th day after surgery, the functional assessment score and skeletal muscle atrophy degree of VEGF group and NGF group were significantly lower than those of normal control group and blank control group.The endothelial cell proliferation index and the capillary density of VEGF group and NGF group were significantly increased compared with normal control group and blank control group （P 〈 0.05）.The NGF and VEGF protein expression of NGF group showed a significant rise when compared with blank control group （P 〈 0.05）.Similarly, the VEGF protein expression of VEGF group was significantly higher than that of blank control group （P 〈 0.05）, but there was no significant difference of the NGF protei展开更多
文摘【目的】研究慢性热应激对黄羽肉鸡肝脏和肌肉的抗氧化能力与内质网应激以及腓肠肌肌纤维类型的影响.【方法】试验选用20只47日龄黄羽肉鸡,随机分为常温组和慢性热应激组,每组10只.鸡只饲养在人工气候室,试验期30 d.试验结束采集血液、肝脏和腓肠肌样品,利用试剂盒法检测血清生化指标、血清激素以及血清和肝脏抗氧化指标.利用实时荧光定量PCR法检测内质网应激(Endoplasmic reticulum stress,ERS)相关基因和腓肠肌不同肌纤维肌球蛋白重链(Myosin heavy chain,My HC)基因mRNA的表达.【结果和结论】慢性热应激显著降低肉鸡平均日增质量、血清甘油三酯(TG)、甲状腺激素(T3和T4)、胰岛素样生长因子1(Insulin-like growth factor 1,IGF-1),显著升高血清皮质酮(CORT)水平(P<0.05).同时,慢性热应激显著升高血清中丙二醛(MDA)含量,降低血清和肝脏谷胱甘肽过氧化物酶(GSH-PX)活性和肝脏总抗氧化能力(T-AOC)(P<0.05).此外,慢性热应激显著提高肉鸡肝脏和腓肠肌中热休克蛋白70(Heat shock protein 70,HSP70)基因以及腓肠肌中转录激活因子4(Activating transcription factor 4,ATF4)基因mRNA的表达(P<0.05),降低腓肠肌中葡萄糖调节蛋白78(Glucose-regulated protein 78,GRP78)基因mRNA的表达,而对肝脏中ATF4和GRP78基因mRNA的表达量无显著影响.最后,慢性热应激显著降低腓肠肌慢肌(Slow myofiber,SM)My HC基因mRNA表达量(P<0.05)而对快红肌(Fast red myofiber,FRM)和快白肌(Fast white myofiber,FWM)My HC基因mRNA表达量无影响.研究结果提示,慢性热应激可能通过降低血清生长和代谢激素、机体抗氧化能力以及引发细胞内质网应激影响肉鸡生长和腓肠肌纤维类型.
文摘Background： Therapeutic angiogenesis has been shown to promote blood vessel growth and improve tissue perfusion.Nerve growth factor （NGF） has been reported to play an important role in both physiological and pathological angiogenesis.This study aimed to investigate the effects of NGF on angiogenesis and skeletal muscle fiber remodeling in a murine model of hindlimb ischemia and study the relationship between NGF and vascular endothelial growth factor （VEGF） in angiogenesis.Methods： Twenty-four mice were randomly allocated to normal control group （n =6）, blank control group （n =6）, VEGF gene transfection group （n =6）, and NGF gene transfection group （n =6）.The model of left hindlimb ischemia model was established by ligating the femoral artery.VEGF165 plasmid （125 μg） and NGF plasmid （125 μg） was injected into the ischemic gastrocnemius of mice from VEGF group and NGF group, respectively.Left hindlimb function and ischemic damage were assessed with terminal points at 21th day postischemia induction.The gastrocnemius of four groups was tested by hematoxylin-eosin staining, proliferating cell nuclear antigen and CD34 immunohistochemistry staining, and myosin ATPase staining.NGF and VEGF protein expression was detected by enzyme-linked immunosorbent assay.Results： On the 21th day after surgery, the functional assessment score and skeletal muscle atrophy degree of VEGF group and NGF group were significantly lower than those of normal control group and blank control group.The endothelial cell proliferation index and the capillary density of VEGF group and NGF group were significantly increased compared with normal control group and blank control group （P 〈 0.05）.The NGF and VEGF protein expression of NGF group showed a significant rise when compared with blank control group （P 〈 0.05）.Similarly, the VEGF protein expression of VEGF group was significantly higher than that of blank control group （P 〈 0.05）, but there was no significant difference of the NGF protei
