p38 mitogen-activated protein kinase-dependent and -independent intracellular signal transduction pathways leading to apoptosis in human neutrophils.

The Journal of Biological Chemistry
S C FraschP M Henson

Abstract

Human neutrophils undergo apoptosis spontaneously when cultured in vitro; however, the signal transduction pathways involved remain largely unknown. In some cell types, c-Jun NH2-terminal kinase and p38 mitogen-activated protein kinase (MAPK) have been implicated in the pathways leading to stress-induced apoptosis. In this study, we begin to define two pathways leading to apoptosis in the neutrophil induced either by stress stimuli (UV, hyperosmolarity, sphingosine) or by anti-Fas antibody or overnight culture in vitro (spontaneous apoptosis). Apoptosis induced by stress stimuli activated p38 MAPK, and apoptosis was inhibited by the specific p38 MAPK inhibitor, 6-(4-Fluorophenyl)-2.3-dihydro-5-(4-puridinyl)imidazo(2, 1-beta)thiazole dihydrochloride. Furthermore, differentiation of HL-60 cells toward the neutrophil phenotype resulted in a loss in c-Jun NH2-terminal kinase activation with concomitant acquisition of formylmethionylleucylphenylalanine-stimulatable and stress-inducible p38 MAPK activity as well as apoptosis blockade by the p38 MAPK inhibitor. In contrast, anti-Fas-induced or spontaneous apoptosis occurred independent of p38 MAPK activation and was not blocked by the inhibitor. Both pathways appear to utilize member(...Continue Reading

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