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M9610074.TXT
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1996-01-30
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Document 0074
DOCN M9610074
TI The role of the cell cycle in HIV-1 infection.
DT 9601
AU Zack JA; Department of Medicine, UCLA School of Medicine, USA.
SO Adv Exp Med Biol. 1995;374:27-31. Unique Identifier : AIDSLINE
MED/96047235
AB Infection of quiescent lymphocytes with human immunodeficiency virus
type 1 (HIV-1) does not result in production of progeny virus. We have
previously reported that although HIV-1 can enter quiescent lymphocytes
with high efficiency, the reverse transcription process does not go to
completion. This results in a viral genome which is composed partly of
viral RNA and partly of viral DNA. If a mitogenic signal is applied
shortly after infection to a cell harboring such a structure, reverse
transcription can go to completion and progeny virus will be produced.
However, this partially reverse transcribed structure is extremely
labile, and the efficiency of virus rescue decreases rapidly, with
increasing times between infection and activation. Our laboratory is
using inhibitors of cell activation to identify at which stage of the
cell cycle this block to reverse transcription occurs. We have found
that agents that arrest the cell in the late G1 phase of the cell cycle
do not alter the ability of the virus to complete reverse transcription.
However, agents that inhibit activation of the cell by blocking
transition through G1 prevent completion of reverse transcription. It
thus appears that immunosuppression of the target cell may be a means of
preventing productive infection of the cell. We have also been using the
severe combined immunodeficient mouse implanted with human tissue
(SCID-hu) as an in vivo model to study HIV-1 pathogenic properties. When
human fetal thymic implants in these animals are infected by HIV-1,
profound depletion of CD4-bearing human thymocytes is seen.(ABSTRACT
TRUNCATED AT 250 WORDS)
DE Acquired Immunodeficiency Syndrome/*PATHOLOGY Animal Cell Cycle/DRUG
EFFECTS/*PHYSIOLOGY Cell Differentiation/PHYSIOLOGY Human *HIV-1
Mice Support, U.S. Gov't, P.H.S. Transcription, Genetic/DRUG EFFECTS
*Virus Replication JOURNAL ARTICLE REVIEW REVIEW, TUTORIAL
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).