期刊
CLINICAL AND EXPERIMENTAL PHARMACOLOGY AND PHYSIOLOGY
卷 41, 期 12, 页码 965-975出版社
WILEY
DOI: 10.1111/1440-1681.12328
关键词
bone; cell senescence; embryonic development; ossification; placenta; skeletal development
资金
- National Basic Research Program of China [2012CB911204]
- National Natural Science Foundation of China [81170313, 81272889]
- Hangzhou Normal University
- National Health and Medical Research Council of Australia
Cellular senescence protects multicellular organisms from tissue overgrowth including cancer, and contributes to tissue ageing. With stable cell cycle arrests, cellular senescence has been mostly studied in the adult tissues of mammals. In the present study, we report widespread cellular senescence within certain time windows of late-phase normal development of mouse embryos. Using in situ senescence-associated beta-galactosidase (SA-beta-gal) staining, we showed SA-beta-gal activity in selected cell populations of the brain, stomach, interdigital webs, tail, ear, limbs and nasal mouth area on gestation day 14.5 of the mouse embryos. On day 18.5 of gestation, selected cells in the intestines and bone developmental areas showed SA-beta-gal activity. The chondrocytes in ossification zones were significantly marked by the activities of SA-beta-gal, p21, p15 and Hp1Y, suggesting activation of the cell cycle checkpoint by the p53 and Rb pathways, and development of senescence-associated heterochromatic foci. Throughout gestation days 14.5-18.5, the trophoblast cells in the labyrinth layer of the placentas also showed strong activities of SA-beta-gal, p53 and p21. Increased expressions of p19, p16 and Rb of the p16/Rb pathway, and reduced expressions of Ki67 were also observed in the placentas. Taken together, the present findings suggest that cellular senescence represents an essential mechanism at multiple sites including the fetal bone forming zones and placenta during mammalian embryonic development, playing potential roles in the full embryonic development of tissue growth and organ formation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据