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Regulation of human monocyte surface antigen expression. I. Up- modulation of Mo3e antigen expression on U-937 and HL-60 cells stimulated by pharmacologic activators of protein kinase C

RF Todd , MJ Bury, PA Alvarez, DA Brott and DY Liu

Mo3e is a protein (p 50,80) that is expressed on the surface of human monocytic cells after exposure in vitro to soluble activating factors that include bacterial lipopolysaccharide, muramyl dipeptide, and phorbol myristate acetate (PMA). The surface expression of Mo3e may represent a cellular event that occurs in response to the formation of "secondary messengers" that include diacylglycerol, inositol trisphosphate, and calcium ions. This postulate is based on the stimulatory effect of agents that can mimic the activity of endogenous diacylglycerol (PMA and other biologically active phorbol compounds, mezerein, and L-alpha-1,2 dioctanoylglycerol) and inositol trisphosphate (ionomycin) on Mo3e expression by U-937 and HL-60 cells. The inhibitory effect of phospholipid-active calmodulin inhibitors (trifluoperazine, chlorpromazine, and dibucaine), calcium antagonists (nicardipine and TMB-8), and EGTA further support the involvement of phospholipid- and calcium-dependent protein kinase (protein kinase C) and calcium ions in the up-modulation of Mo3e surface expression.

Volume 68, Issue 5, pp. 1154-1161, 11/01/1986
Copyright © 1986 by The American Society of Hematology


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