Alternative complement pathway activation by HIV infected cells: C3 fixation does not lead to complement lysis but enhances NK sensitivity.

Abstract:

:HIV infected T and monocytic cell lines could activate and fix C3 fragments when incubated in human serum under conditions allowing for activation of the alternative complement pathway. Normal T lymphocytes incubated with HIV could also activate and fix C3. This activity was, at least in part, the property of the virus itself since cell-free HIV could efficiently activate C3. The C3 activating HIV infected cells were resistant to complement-mediated lysis, even after prolonged incubation periods. However, their sensitivity to cell-mediated natural killing increased, presumably due to their interaction with complement receptor bearing NK lymphocytes. The results suggest that the alternative complement pathway may contribute to the depletion of CD4+ T lymphocytes during HIV infection in vivo.

journal_name

Int Immunol

journal_title

International immunology

authors

Yefenof E,Asjö B,Klein E

doi

10.1093/intimm/3.4.395

subject

Has Abstract

pub_date

1991-04-01 00:00:00

pages

395-401

issue

4

eissn

0953-8178

issn

1460-2377

journal_volume

3

pub_type

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