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M9460195.TXT
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1994-06-12
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Document 0195
DOCN M9460195
TI The difference in gp160 and gp120 of HIV type 1 in the induction of CD4
downregulation preceding single-cell killing.
DT 9408
AU Koga Y; Nakamura K; Sasaki M; Kimura G; Nomoto K; Department of
Infectious Disease, School of Medicine, Tohkai; University, Kanagawa,
Japan.
SO Virology. 1994 May 15;201(1):137-41. Unique Identifier : AIDSLINE
MED/94233762
AB The human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein is
synthesized as a precursor glycoprotein, gp160, and is then processed
into gp120 and gp41. In the present study, CD4+ cell clones expressing
either gp160 or gp120 of HIV-1 under the transcriptional control of an
inducible promoter were made in order to examine the effect of these env
products on the downregulation of surface CD4 and cell injury. A
complete disappearance of surface CD4 preceding single-cell death
occurred in the cell clones expressing gp160, in which a complex between
CD4 and gp160 was formed and then accumulated intracellularly. In
contrast to this, the cell clones expressing gp120 neither exhibited any
such depletion of surface CD4 nor showed any apparent cytopathic effect.
Therefore, it is thought that gp160 but not gp120 plays a crucial role
in both the downregulation of surface CD4 and the resultant cell death
in the cells infected with HIV-1.
DE Antigens, CD4/*METABOLISM Base Sequence *Cell Death Cell Line
Cytopathogenic Effect, Viral Down-Regulation (Physiology) Gene
Products, env/GENETICS/*PHYSIOLOGY Genes, env/GENETICS Human HIV
Envelope Protein gp120/GENETICS/*PHYSIOLOGY HIV-1/*PATHOGENICITY
Molecular Sequence Data Monocytes/CYTOLOGY/MICROBIOLOGY Mutagenesis,
Site-Directed Protein Precursors/GENETICS/*PHYSIOLOGY Support,
Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).