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1994-10-01
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Document 0001
DOCN M94A0001
TI HIV coating gp 120 glycoprotein-dependent prostaglandin E2 release by
human cultured astrocytoma cells is regulated by nitric oxide formation.
DT 9412
AU Mollace V; Colasanti M; Rodino P; Lauro GM; Nistico G; Department of
Biology, University of Rome Tor Vergata, Italy.
SO Biochem Biophys Res Commun. 1994 Aug 30;203(1):87-92. Unique Identifier
: AIDSLINE MED/94354888
AB The role of the L-arginine-NO pathway on the formation of PGE2 by
cultured astroglial cells incubated with the HIV coating glycoprotein
gp120 was investigated. Preincubation of human cultured T 67 astrocytoma
cells with gp 120 (100-500 nM) produced a significant increase of
nitrite (the breakdown product of NO) and PGE2 in cell supernatants. The
effect of gp 120 on both nitrite and PGE2 production was antagonized by
inhibition of NO synthase by L-NAME (20-300 microM). The inhibition of
gp120-induced PGE2 production by L-NAME was reverted by addition of
arachidonic acid (30 microM), an effect antagonized by the
cyclo-oxygenase inhibitor indomethacin (10 microM). Methylen bleu, an
inhibitor of the biological activity of NO acting at the guanylate
cyclase level failed to affect gp 120-mediated PGE2 release showing that
the increase of cGMP subsequent to NO production was not involved in the
modulatory activity of NO on arachidonic acid cascade. On the basis of
present experiments we conclude that gp-120-induced release of PGE2 by
astroglial cells is driven by NO, thereby contributing in the
involvement of glial cells in HIV-related cerebral disorders.
DE Amino Acid Oxidoreductases/*ANTAGONISTS & INHIB Arginine/*ANALOGS &
DERIVATIVES/PHARMACOLOGY Astrocytoma Cell Line
Dinoprostone/*METABOLISM Dose-Response Relationship, Drug Human HIV
Envelope Protein gp120/*PHARMACOLOGY Indomethacin/PHARMACOLOGY
Kinetics Nitric Oxide/*BIOSYNTHESIS Nitrites/METABOLISM
Nitroprusside/PHARMACOLOGY Support, Non-U.S. Gov't Tumor Cells,
Cultured JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).