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M94A2105.TXT
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1994-10-25
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Document 2105
DOCN M94A2105
TI The host cell antigenicity determines the cell membrane proteins on
HIV-1 progeny.
DT 9412
AU Capobianchi MR; Fais S; Abbate I; Castilletti C; Mercuri F; Cordiali Fei
P; Ameglio F; Ficociello B; Dianzani F; Institute of Virology,
University La Sapienza, Rome, Italy.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):38 (abstract no. 127A). Unique
Identifier : AIDSLINE ICA10/94370470
AB OBJECTIVE: Cell-derived membrane molecules, including HLA Class I and
II, adhesion molecules such as ICAM-1, -2, -3 and LFA-1, as well as
receptors for growth factors, are associated with the external surface
of HIV-1. To test whether the expression of surface antigens by the host
cells could influence the antigenic profile of the virus progeny, we
compared the pattern of host cell derived proteins on HIV-1 progeny from
cells with different surface markers. METHODS: Cells from T, B and
monocytoid origin were used to replicate the HIV-1 and immobilized
antibody capture (IAC) was used to identify the cell surface molecules
incorporated in virions. Susceptible target cells were added to the IAC
plates to verify the infectivity of the virus captured by MAbs. HIV-1
laboratory strains with established cellular tropism, as well as primary
isolates, were compared to verify the predictive value of such analysis
on the cellular source of a given virus population. RESULTS: For the
lymphotropic strain IIIB the cell adhesion receptors, as well as HLA
antigens, which are expressed by all the cell lines used to propagate
HIV-1, are constantly included in the virus progeny. On the contrary,
the specific T, B and monocyte markers are incorporated in HIV-1 progeny
according to the host cell origin. In keeping with these observations,
the monocytic markers CD14 and CD68 are included in the monocytotropic
HIV-1 Bal strain grown on macrophages, whereas these antigens are not
present on this virus strain when grown on T blasts. The presence of
cell specific markers is observed also in HIV-1 primary isolates grown
in activated PBMC. DISCUSSION AND CONCLUSIONS: The host cell antigenic
footprint on infectious HIV-1 could be used as marker of viral tropism.
Preliminary data suggest that this approach can be applied to plasma
samples for phenotyping circulating HIV-1 from viremic individuals,
avoiding strain selection due to culture conditions. Host factors (i.e.
cytokines), altering the cellular expression of membrane antigens (i.e.
adhesion receptors), involved in the attachment of viral particles,
could influence the ability of HIV-1 to infect both CD4 positive and
negative cells.
DE Antigens, Surface/*ISOLATION & PURIF B-Lymphocytes/MICROBIOLOGY Cell
Adhesion Molecules/ISOLATION & PURIF Human HIV Antigens/*ISOLATION &
PURIF HIV-1/*GENETICS HLA Antigens/ISOLATION & PURIF
Monocytes/MICROBIOLOGY Phenotype Predictive Value of Tests
T-Lymphocytes/MICROBIOLOGY Viral Envelope Proteins/ISOLATION & PURIF
Virion/IMMUNOLOGY Virus Replication MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).