摘要
目的:探讨微重力介导果蝇双翅边缘缺刻同源基因1(Notch1)信号调控巨噬细胞极化对骨稳态的影响。方法:以尾吊法(HLS)模拟微重力环境构建动物模型。动物分组为Control组、HLS组、HLS+NC组、HLS+si组、HLS+rhNF-κB组,ELISA检测大鼠血清中TNF-α和IL-1β的含量;TUNEL染色检测骨组织的细胞凋亡;免疫荧光检测骨组织中巨噬细胞的极化。以旋转壁式生物反应器模拟微重力环境构建大鼠成骨细胞CP-R091微重力模型;细胞实验分为Control组、HLS组、HLS+NC组、HLS+si组、HLS+rhNF-κB组;CCK-8实验检测各组细胞的增殖活性,AO实验检测各组细胞的凋亡率;PCR检测骨组织和细胞中成骨相关基因的表达;Western blot检测各组骨组织和细胞中Notch1、发状分裂相关增强子-l(HES-1)、Notch通路配体1(Jagged1)的表达。结果:与Control组相比,HLS组大鼠血清中TNF-α和IL-1β的含量、细胞凋亡率、M1样巨噬细胞比例明显升高;与HLS组相比,HLS+si组能明显部分逆转上述参数变化趋势,而HLS+rhNF-κB组则使上述参数值变化更显著。与Control组相比,HLS组细胞的增殖活性明显降低,细胞凋亡率明显升高;与HLS组细胞相比,HLS+si组能明显部分逆转上述参数变化趋势,而HLS+rhNF-κB组则使上述参数值更为显著;微重力环境下骨组织和细胞中成骨相关基因Ⅰ型胶原蛋白(COL1)、骨钙素(OCN)以及成骨分化基因Runt相关转录因子2(RUNX2)表达明显降低,而Notch-1、Hes-1和Jagged1的表达明显升高,差异均具有统计学意义(均P<0.05)。结论:微重力介导Notch1信号调控巨噬细胞M1/M2样极化,参与骨组织细胞增殖与凋亡,影响骨稳态的进展。
Objective:To investigate the effect of microgravity-mediated Notch1 signaling on macrophage polarization on bone homeostasis.Methods:The animal model was constructed by tail-limb suspension(HLS)to simulate the microgravity environment.The animals were grouped into Control group,HLS group,HLS+NC group,HLS+si group,HLS+rhNF-κB group.ELISA was used to detect the content of TNF-αand IL-1βin serum of rats.TUNEL staining was used to detect the apoptosis of bone tissue.Immunofluorescence was used to detect the polarization of macrophages in bone tissue.The rat osteoblast CP-R091 microgravity model was constructed by simulating the microgravity environment with a rotating wall bioreactor.The cell experiments were divided into Control group,HLS group,HLS+NC group,HLS+si group,HLS+rhNF-κB group.CCK-8 test was used to detect the proliferation activity of cells in each group,and AO test was used to test the apoptosis rate of cells in each group.PCR was used to detect the expression of osteogenesis-related genes in bone tissues and cells.Western blot was used to detect the expression of Notch1,hair division-related enhancer-1(HES-1),and Notch pathway ligand 1(Jagged1)in bone tissues and cells of each group.Results:Compared with control group,the contents of TNF-αand IL-1βin the serum of the rats in the HLS group,the apoptosis rate,and the proportion of M1 macrophages were significantly increased.Compared with HLS group,the HLS+si group could obviously partially reverse the change trend of the above parameters,while HLS+rhNF-κB group significantly changed the above parameter values.Compared with control group,the proliferation activity of the cells in the HLS group was significantly reduced,and the apoptosis rate was significantly increased.Compared with HLS group,the HLS+si group could obviously partially reverse the change trend of the above parameters,while the HLS+rhNF-κB group made the above parameter values worse.The expressions of the osteogenesis-related genes collagen typeⅠ(COL1),osteocalcin(OCN)and Runt-rel
作者
许静
郭健
罗永贵
李大星
唐英
娄宝佳
彭淼
郑永
XU Jing;GUO Jian;LUO Yonggui;LI Daxing;TANG Ying;LOU Baojia;PENG Miao;ZHENG Yong(Orthopae-dic Hospital Bone Within Five Units in Guizhou Province,Guiyang 550000,China)
出处
《中国免疫学杂志》
CAS
CSCD
北大核心
2024年第8期1625-1633,共9页
Chinese Journal of Immunology
基金
贵州省卫生健康委员会项目(gzwkj2022-033)。
