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  • Title: Evidence that filopodia outgrowth is a common final pathway for fibroblast growth inhibition in vitro.
    Author: Stanulis-Praeger BM, Yaar M, Gilchrest BA.
    Journal: Exp Dermatol; 1992 Oct; 1(3):141-8. PubMed ID: 1285409.
    Abstract:
    To identify events associated with fibroblast growth inhibition, the effect of two known inhibitors, interferon-alpha and all-trans retinoic acid, on the growth and surface morphology of cultured fibroblasts was examined. Interferon-alpha administered at seeding reduced both growth rate and saturation density; all-trans retinoic acid reduced only saturation density. However, both negative growth modulators were associated with an increase in filopodia outgrowth and an increase in intracellular filamentous actin in a time course corresponding to onset of growth inhibition by these agents. In combination with earlier findings, these data suggested that, regardless of etiology, cultured fibroblast growth restriction is mediated in part by an actin-dependent outgrowth of filopodia that augment intercellular contact.
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