R. Judware et al., PROPENSITY FOR MACROPHAGE APOPTOSIS IS RELATED TO THE PATTERN OF EXPRESSION AND FUNCTION OF INTEGRIN EXTRACELLULAR-MATRIX RECEPTORS, Biochemical and biophysical research communications, 246(2), 1998, pp. 507-512
Ligation of integrins to an extracellular matrix activates signal tran
sduction systems which produce multiple responses in different cell ty
pes. Adhesion often provides a survival signal to cells; disruption of
adhesion frequently results in apoptosis. Our laboratory has utilized
apoptosis-sensitive and -resistant cell lines to investigate the role
of integrin expression and function in regulation of apoptosis in mac
rophages. Chronic exposure of murine macrophage-like RAW264.7 cells to
apoptosis-inducing agents (bacterial lipopolysaccharide and interfero
n-gamma) resulted in the generation of a derivative cell Line (RES) re
sistant to apoptosis. Observation of RAW and RES cultures indicated a
difference in adhesion between the two cell types. The two cell lines
also exhibit significant differences in expression of integrins previo
usly characterized to be important in apoptosis. (C) 1998 Academic Pre
ss.