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T Lymphocytes
(Received for publication, June 20, 1997)
,
¶
From the
Receptor Biochemistry Unit,
T lymphocytes play an important early role
in the defense against pathogens. Their function is terminated by
acquisition of susceptibility to CD95-triggered apoptosis. Here we show
that the regulation of this process depends on the activity of the endothelial NO synthase expressed by 
T lymphocytes, which is modulated in an activation-dependent way. The effects of
nitric oxide thus generated, mediated via cGMP generation, are exerted at at least two sites along the CD95 signaling cascade: one at, or
upstream, and the other downstream of ceramide generation. At either
site, nitric oxide/cGMP action is sufficient for protection from
apoptosis. The effect of NO is selective for apoptosis induced by CD95
cross-linking, since it does not affect apoptotic program triggered by
other stimuli. The evidence here reported demonstrates a
new physiological role for nitric oxide, acting as a survival factor
for T lymphocytes.
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