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HIV‐1‐specific cellular immune responses among HIV‐1‐resistant sex workers
Author(s) -
Fowke Keith R,
Kaul Rupert,
Rosenthal Kenneth L,
Oyugi Julius,
Kimani Joshua,
Rutherford W John,
Nagelkerke Nico JD,
Ball T Blake,
Bwayo Job J,
Simonsen J Neil,
Shearer Gene M,
Plummer Francis A
Publication year - 2000
Publication title -
immunology and cell biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.999
H-Index - 104
eISSN - 1440-1711
pISSN - 0818-9641
DOI - 10.1046/j.1440-1711.2000.00944.x
Subject(s) - cytotoxic t cell , ctl* , immunology , virology , immune system , cd8 , biology , vaccinia , t cell , virus , medicine , recombinant dna , in vitro , gene , genetics
The goal of the present study was to determine whether there were HIV‐1 specific cellular immune responses among a subgroup of women within a cohort of Nairobi prostitutes ( n = 1800) who, despite their intense sexual exposure to HIV‐1, are epidemiologically resistant to HIV‐1 infection. Of the 80 women defined to be resistant, 24 were recruited for immunological evaluation. The HIV‐1‐specific T‐helper responses were determined by IL‐2 production following stimulation with HIV‐1 envelope peptides and soluble gp120. Cytotoxic T lymphocyte responses were determined by lysis of autologous EBV‐transformed B cell lines infected with control vaccinia virus or recombinant vaccinia viruses containing the HIV‐1 structural genes env , gag and pol . Resistant women had significantly increased HIV‐1 specific T‐helper responses, as determined by in vitro IL‐2 production to HIV‐1 envelope peptides and soluble glycoprotein 120, compared with low‐risk seronegative and HIV‐1‐infected controls ( P ≤ 0.01, Student's t ‐test). Seven of the 17 (41%) resistant women showed IL‐2 stimulation indices ≥ 2.0. HIV‐1‐specific CTL responses were detected among 15/22 (68.2%) resistant women compared with 0/12 low‐risk controls (Chi‐squared test, P < 0.001). In the two resistant individuals tested, the CTL activity was mediated by CD8 + effectors. Many HIV‐1‐resistant women show evidence of HIV‐1‐specific T‐helper and cytotoxic responses. These data support the suggestion that HIV‐1‐specific T‐cell responses contribute to protection against HIV‐1 infection.