Role of Notch expression in premature senescence of murine bone marrow stromal cells  

作　　者：Kejie Zhanga,b, Lifang Huang b, Hanying Sunb, Yan Zhub, Yi Xiaob, Mei Huang b, Wenli Liub,a Department of Hematology, Zhongshan Hospital, Xiamen University, Fujian Medical University Clinic Teaching Hospital, Xiamen 361004, China b Department of Hematology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China 

出　　处：《Progress in Natural Science:Materials International》2009年第5期557-562,共6页自然科学进展·国际材料（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.30570773)

摘　　要：The aim of the present study was to investigate the role of the Notch signaling pathway in premature senescence of murine bone marrow stromal cells in vitro. The intracellular domain of Notch 1 （ICN） was transfected into cultured murine bone marrow stromal cells by lipofectamine transfection. After three days, the proliferation of transfected cells was measured by MTT assay. Cell cycle distribution was analyzed by flow cytometry. Senescence-associated beta-galactosidase （SA-beta-ga1） was measured, and the percentage of positive cells was evaluated by assessing 1000 cells in random fields of view. The expressions of p53 and p21cipl/wafl were analyzed by both RT-PCR and Western blot analysis. The results showed that activation of Notch signaling inhibited proliferation of murine bone marrow stromal cells with induction of G1 arrest, increased the percentage of SA-beta-gal positive cells, and upregulated p53 and p21Cip1/waf1 mRNA and protein expression levels. Thus, the activated Notch signaling could induce premature senescence of bone marrow stromal cells through the p53-p21cipl/waf1 pathway.The aim of the present study was to investigate the role of the Notch signaling pathway in premature senescence of murine bone marrow stromal cells in vitro. The intracellular domain of Notch 1 (ICN) was transfected into cultured murine bone marrow stromal cells by lipofectamine transfection. After three days, the proliferation of transfected cells was measured by MTT assay. Cell cycle distribution was analyzed by flow cytometry. Senescence-associated beta-galactosidase (SA-beta-gal) was measured, and the percentage of positive cells was evaluated by assessing 1000 cells in random fields of view. The expressions of p53 and p21Cip1/Waf1 were analyzed by both RT-PCR and Western blot analysis. The results showed that activation of Notch signaling inhibited proliferation of murine bone marrow stromal cells with induction of G1 arrest, increased the percentage of SA-beta-gal positive cells, and upregulated p53 and p21Cip1/Waf1 mRNA and protein expression levels. Thus, the activated Notch signaling could induce premature senescence of bone marrow stromal cells through the p53-p21Cip1/Waf1 pathway.

关 键 词：Bone marrow stromal cells Premature senescence Notch signaling pathway 

分 类 号：Q25[生物学—细胞生物学]