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J Biol Chem, Vol. 273, Issue 22, 13475-13481, May 29, 1998
From the Department of Biochemistry, INSERM CJF 94--02, Faculté de Médecine de Paris-Ouest, Universite René
Descartes, Paris, France
In isolated adipocytes, the nitrosothiols
S-nitroso-N-acetyl-penicillamine (SNAP) and
S-nitrosoglutathione stimulate basal lipolysis, whereas the
nitric oxide (NO·) donor 1-propamine,
3-(2-hydroxy-2-nitroso-1-propylhydrazine) (PAPA-NONOate) or NO gas have
no effect. The increase in basal lipolysis due to nitrosothiols was
prevented by dithiothreitol but not by a guanylate cyclase inhibitor.
In addition the cyclic GMP-inhibited low Km, cyclic
AMP phosphodiesterase activity was inhibited by SNAP suggesting that
SNAP acting as NO+ donor increases basal lipolysis through
a S-nitrosylation mediated inhibition of phosphodiesterase.
Contrasting with these findings, SNAP reduced both
isoproterenol-stimulated lipolysis and cyclic AMP production, whereas
it failed to modify forskolin-, dibutyryl cyclic AMP-, or
isobutylmethylxanthine-stimulated lipolysis, suggesting that SNAP
interferes with the
-adrenergic signal transduction pathway upstream
the adenylate cyclase. In contrast with SNAP, PAPA-NONOate or NO gas
inhibited stimulated lipolysis whatever the stimulating agents used
without altering cyclic AMP production. Moreover PAPA-NONOate slightly
reduces (30%) the hormone-sensitive lipase (HSL) activity indicating
that stimulated lipolysis inhibition by NO· is
linked to both inhibition of the HSL activity and the cyclic AMP-dependent activation of HSL. These data suggest that
NO· or related redox species like
NO+/NO
are potential regulators of lipolysis
through distinct mechanisms.
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