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J Virol, June 1998, p. 5231-5238, Vol. 72, No. 6
Intramural Research Support Program,
SAIC-Frederick,1 and the Laboratory of
Leukocyte Biology,3 National Cancer
Institute-Frederick Cancer Research and Development Center, Frederick,
Maryland, and
Immunology Program, National Institute of Aging,
Baltimore, Maryland2
Studies on the development and function of CD4+
TH1 and TH2 cells during the progression to
AIDS may increase the understanding of AIDS pathogenesis. The
preferential replication of human immunodeficiency virus (HIV) in
either TH1 or TH2 cells could alter the
delicate balance of the immune response. TH1 (gamma
interferon [IFN-
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Similar Levels of Human Immunodeficiency Virus Type
1 Replication in Human TH1 and TH2
Clones
] positive, interleukin-4 [IL-4] and IL-5
negative) and TH2 (IFN-
negative, IL-4 and IL-5
positive) clones, developed from several healthy donors, pedigreed by
reverse transcriptase PCR (RT-PCR) and enzyme linked immunosorbent
assay have similar levels of cell surface expression of CD4 and several
chemokine receptor cofactors necessary for viral entry. After
activation by specific antigens and infection with T-cell-tropic
strains of HIV type 1 (HIV-1), TH1 and TH2
clones showed similar levels of viral entry and reverse transcription.
At days 3 through 14 postinfection, HIV replicated to similar levels in
several TH1 and TH2 clones as measured by release of HIV p24 and total number of copies of gag
RNA/total cell RNA as measured by RT-PCR. When values were normalized
for viable cell number in three clones of each type, there was up to
twofold more HIV RNA in TH1 than TH2 cells. In
addition, several primary monocytotropic HIV-1 strains were able to
replicate to similar levels in TH1 and TH2
cells. These studies suggest that the importance of TH1 and
TH2 subsets in AIDS pathogenesis transcends clonal
differences in their ability to support HIV replication.
*
Corresponding author. Mailing address: Laboratory of
Leukocyte Biology, NCI-Frederick Cancer Research and Development
Center, Bldg. 567, Rm. 254, Frederick, MD 21702-1201. Phone: (301)
846-1504. Fax: (301) 846-7034. E-mail: RuscettF{at}ncifcrf.gov.
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