Proliferating cell nuclear antigen (PCNA) is expressed in activated rat skeletal muscle satellite cells
作者:
Sally E. Johnson,
Ronald E. Allen,
期刊:
Journal of Cellular Physiology
(WILEY Available online 1993)
卷期:
Volume 154,
issue 1
页码: 39-43
ISSN:0021-9541
年代: 1993
DOI:10.1002/jcp.1041540106
出版商: Wiley Subscription Services, Inc., A Wiley Company
数据来源: WILEY
摘要:
AbstractSkeletal muscle satellite cells from uninjured muscle of adult animals are generally found to be in a quiescent state, and when cultured, they remain quiescent in vitro for a period of time which is directly related to the age of the donor animal. A technique for studying the activation of satellite cells in primary cultures has been developed and employs proliferating cell nuclear antigen (PCNA) as a marker for entrance into the S phase of the cell cycle. PCNA is a protein involved in DNA replication and is maximally expressed in S phase of the cell cycle. We monitored PCNA expression in satellite cells isolated from young (3 week) and adult (9 month) rats, and our results indicate that satellite cells begin to accumulate PCNA prior to changes in cell number in both age groups. Using ELISA techniques, we demonstrated that addition of an extract of crushed muscle (CME) activated satellite cells and significantly reduced the length of the lag phase in cells from both age groups. Addition of bFGF shortened the lag phase of PCNA synthesis in satellite cells from 3‐week‐old rats but had no effect on the kinetics of PCNA expression in cells from 9‐month‐old rats. Based on our experiments, PCNA expression can be used as a marker to follow the entry of satellite cells into the cell cycle in primary mass cultures. © 1993 Wiley
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