Proliferating cell nuclear antigen (PCNA) is expressed in activated rat skeletal muscle satellite cells

Sally E. Johnson, Ronald E. Allen

    Research output: Contribution to journalArticlepeer-review

    88 Scopus citations


    Skeletal 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‐Liss, Inc.

    Original languageEnglish (US)
    Pages (from-to)39-43
    Number of pages5
    JournalJournal of Cellular Physiology
    Issue number1
    StatePublished - Jan 1993

    ASJC Scopus subject areas

    • Physiology
    • Clinical Biochemistry
    • Cell Biology


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