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M94A3237.TXT
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1994-10-25
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Document 3237
DOCN M94A3237
TI Soluble CD95 (FAS delta TM) inhibits HIV-related apoptosis.
DT 9412
AU Krowka JF; Sheppard HW; Ascher MS; Fitzpatrick P; Kiefer MC; Pavloff N;
Barr PJ; VRDL, CA Dept. of Health Services, Berkeley 94704.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):121 (abstract no. PA0105). Unique
Identifier : AIDSLINE ICA10/94369338
AB OBJECTIVE: To analyze the role of the apoptosis/activation antigen FAS
(CD95) in depletion of lymphocytes from HIV-infected (HIV+) individuals.
METHODS: Peripheral blood lymphocytes (PBL) from HIV+ and
HIV-seronegative (HIV) participants of the San Francisco Men's Health
Study were stained with monoclonal antibodies and analyzed by flow
cytometry to quantitate CD95 expression. Gel electrophoresis was used to
analyze DNA fragmentation in PBL cultured in the presence or absence of
a soluble recombinant form of CD95 (FAS delta TM). RESULTS: Expression
of CD95 was significantly increased on the surfaces of both CD4+ and
CD8+ PBL from HIV+ donors in comparison to HIV controls. Enhanced CD95
expression on CD4+ PBL Showed a strong negative correlation with CD4+
PBL numbers in HIV+ individuals. FAS delta TM but not control
baculovirus extracts blocked completely DNA fragmentation of
mitogen-stimulated PBL. CONCLUSIONS: Upregulation of CD95 expression on
PBL occurs in HIV+ donors and may be involved in CD4+ lymphocyte
depletion. FAS delta TM can inhibit lymphocyte apoptosis. Studies to
determine the mechanisms by which HIV affects expression of soluble
and/or membrane-associated CD95 are currently in progress.
DE Antigens, CD/*PHYSIOLOGY Antigens, CD4/PHYSIOLOGY Antigens,
CD8/PHYSIOLOGY Antigens, Surface/*BIOSYNTHESIS *Apoptosis Comparative
Study Flow Cytometry Human *HIV Seronegativity HIV
Seropositivity/*IMMUNOLOGY Lymphocytes/*IMMUNOLOGY/MICROBIOLOGY
Receptors, Cell Surface/*BIOSYNTHESIS T4 Lymphocytes/MICROBIOLOGY
Up-Regulation (Physiology) MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).