Induction of nitric oxide synthase is a necessary precondition for expression of tumor necrosis factor-independent tumoricidal activity by activated macrophages.

Abstract:

:Various bacteria and bacterial products induce in pure, lymphocyte-free bone marrow-derived mononuclear phagocytes (BMMø) the generation of tumor necrosis factor, nitric oxide (NO) synthase, NO and nitrite (NO2-), the flow of L-arginine to citrulline, and tumoricidal activity. The flow of L-arginine to citrulline and formation of NO/NO2- on the one hand and expression of tumoricidal activity were not always closely related; however, these parameters were suppressed in a dose-dependent manner by the flavoprotein inhibitor, diphenyleneiodonium (DPI) and the L-arginine analogue, NG-monomethyl-L-arginine (NMMA). The findings support the concept of a central role of the NO synthase pathway in the generation of tumor necrosis factor-independent tumoricidal activity by activated macrophages but the exact conditions which enable the transfer of the lytic principle from the effector to the target cell remain to be elucidated.

authors

Keller R,Bassetti S,Keist R,Mülsch A,Klauser S

doi

10.1016/s0006-291x(05)80033-6

subject

Has Abstract

pub_date

1992-05-15 00:00:00

pages

1364-71

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)80033-6

journal_volume

184

pub_type

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