Cell culture density modulates the incorporation of HLA antigens by enveloped viruses.

Abstract:

:Uninfected, as well as feline leukemia virus (FeLV) infected human cells cultured under high cell density conditions undergo changes in the expression of major histocompatibility complex (MHC) antigens, as determined by indirect trace binding radio immunoassay (RIA) using monoclonal anti-HLA antibodies and by decreased sensitivity to complement mediated cytotoxicity by anti-HLA alloantibodies. FeLV particles produced by the viral infected cells are also sensitive to neutralization by anti-HLA antibodies, suggesting that enveloped viral particles incorporated MHC antigens in the viral envelope. The amount of HLA antigens expressed in the viral enveloped, closely reflects the expression of HLA antigens by the virus-producer lymphoid cells. FeLV-infected HsB-2 (T) and SB (B) lymphoid cells cultured under high cell concentration condition show decreased expression of some HLA antigens (A2, B12, B17), and the viral particles produced by those cells also incorporate lower amounts of such antigens. Our results, based on the findings that human lymphoid cells (uninfected, as well as FeLV infected) show decreased expression of some HLA membrane determinants when grown under high cell density conditions, indicate that no viral selective mechanism operates in the incorporation of HLA determinants by enveloped viruses. Instead, our results suggest that viruses pick up MHC antigens from the host cell membrane according to the concentration of those antigens on the surface of the cells at the time of virus budding.

journal_name

Hum Immunol

journal_title

Human immunology

authors

Azocar J,Essex M,Yunis EJ

doi

10.1016/s0198-8859(83)80006-8

subject

Has Abstract

pub_date

1983-06-01 00:00:00

pages

59-65

issue

2

eissn

0198-8859

issn

1879-1166

pii

S0198-8859(83)80006-8

journal_volume

7

pub_type

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