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M9630624.TXT
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1996-02-27
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Document 0624
DOCN M9630624
TI HIV-1 mediates rapid apoptosis of lymphocytes from human CD4 transgenic
but not normal rabbits.
DT 9603
AU Leno M; Hague BF; Teller R; Kindt TJ; Laboratory of Immunogenetics,
National Institute of Allergy and; Infectious Diseases, National
Institutes of Health, Rockville,; Maryland 20852, USA.
SO Virology. 1995 Nov 10;213(2):450-4. Unique Identifier : AIDSLINE
MED/96074520
AB Normal rabbit lymphocytes can be infected with HIV-1 although infection
is much less efficient than in human lymphocytes. When peripheral blood
mononuclear cells (PBMC) from rabbits transgenic for human CD4 (HuCD4)
were exposed to HIV-1, enhanced infection and a rapid depletion of
lymphocytes were observed. Cell death in the infected cultures occurred
via apoptosis, but no similar effect was seen in nontransgenic rabbit
PBMC cultures. Induction of apoptosis in HuCD4-expressing cells required
virus replication; heat-inactivated virus or recombinant viral proteins
had no effect on cell viability. Expression of the Fas antigen was
increased in HIV-1-infected CD4+ rabbit lymphocytes. Characterization of
the infected PBMC cultures revealed that apoptosis occurs both in HuCD4+
and HuCD4- cells, indicating that bystander cells are killed. These data
define a requirement for HuCD4 in initiation, but not the spread, of
HIV-1-induced apoptosis in rabbit PBMC and provide a model to probe
mechanisms leading to lymphocyte depletion in HIV-1 infection.
DE Animal Animals, Transgenic Antigens, CD4/*ANALYSIS Antigens,
CD95/BIOSYNTHESIS Apoptosis/*PHYSIOLOGY Cells, Cultured Comparative
Study Human HIV-1/*PHYSIOLOGY
Lymphocytes/*CYTOLOGY/IMMUNOLOGY/*VIROLOGY Rabbits Receptors,
Interleukin-2/BIOSYNTHESIS Up-Regulation (Physiology) JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).