Regulation of C-fos expression by static stretch in rat myometrial smooth muscle cells

O.P. Shynlova, A.D. Oldenhof, M. Liu, L. Langille, Stephen Lye

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    Abstract

    OBJECTIVE: We investigated whether mechanical stretch stimulates expression of the immediate early gene c-fos messenger RNA in rat myometrial smooth muscle cells.STUDY DESIGN: Freshly isolated myometrial smooth muscle cells (from virgin rats) were plated on flexible culture plates that were coated with either collagen I, laminin, elastin, or pronectin and were subjected to a static stretch with a computerized strain unit. Immunocytochemistry was used to define smooth muscle cell phenotype, and c-fos expression levels were assessed by Northern blotting.RESULTS: Myometrial smooth muscle cells maintained their phenotype for at least 7 days in culture. Stretch induced a dramatic increase in levels of c-fos messenger RNA, which peaked after 30 minutes. Stimulation of c-fos gene expression was dependent on the degree of stretch (maximum induction at 25% elongation). Interestingly, as little as 1 minute of stretch was sufficient to induce maximal c-fos expression at 30 minutes. The most dramatic induction of c-fos was observed in smooth muscle cells that were stretched on collagen I-coated plates.CONCLUSION: Myometrial smooth muscle cells can directly respond to mechanical stretch with a strength- and matrix component-dependent increase in c-fos messenger RNA. The time delay between the initial stimulus and the cumulative elevation of c-fos messenger RNA suggests a complex regulation from mechanoreception to c-fos gene expression.
    Original languageEnglish
    Pages (from-to)1358-1365
    JournalAmerican Journal of Obstetrics and Gynecology
    Volume186
    DOIs
    Publication statusPublished - 2002

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