Induction of multinucleated giant cell formation from human blood-derived monocytes by phorbol myristate acetate in in vitro culture - PubMed (original) (raw)

. 1989 Oct 1;143(7):2179-84.

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Induction of multinucleated giant cell formation from human blood-derived monocytes by phorbol myristate acetate in in vitro culture

N F Hassan et al. J Immunol. 1989.

Abstract

Multinucleated giant cells (MGC) of mononuclear phagocyte origin occur in different tissues in various inflammatory states and pathological conditions. Although MGC are believed to be derived from monocyte-derived macrophages by fusion, their mechanism of formation is not known. In this study, we investigated the role of PMA, a protein kinase C activator, in the induction and formation of MGC from blood monocyte-derived macrophages in in vitro culture. The addition of PMA (1 x 10(-9) to 8 x 10(-8) M) to 3-wk-old cultures of blood-derived monocytes induces cell fusion with a 30% to 80% fusion rate. Moreover, IFN-gamma-treated blood-derived monocyte cultures showed an additional enhancement of fusion rate with the addition of PMA. 1(5-isoquinolinesulfonyl)-2-methylpiperazine dihydrochloride, a protein kinase inhibitor, inhibited the formation of macrophage-derived giant cells when added before phorbol ester and IFN-gamma. These findings suggest that protein kinase C may play an important role in the formation of macrophage-derived MGC.

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