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1994-09-05
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Document 0869
DOCN M9480869
TI T cell reactivity against antigen 85 in HIV-infection.
DT 9410
AU Huygen K; Gerard M; Farber CM; Drowart A; van Vooren JP; Clumeck N;
Pasteur Instituut van Brabant, Brussels, Belgium.
SO Abstr Gen Meet Am Soc Microbiol. 1994;94:190 (abstract no. U-100).
Unique Identifier : AIDSLINE ASM94/94313076
AB Antigen 85 (30-32 kD) is the major secreted protein antigen from M.
tuberculosis/bovis BCG culture filtrate. We have previously shown that
32 kD component (Ag85A) of this antigen demonstrates powerful T cell
stimulatory properties resulting in T cell proliferation and IFN-gamma
secretion by PBMC from all healthy tuberculin-positive volunteers and by
only a minority of tuberculosis patients, suggesting a protective role
of T cell immunity to Ag85 in tuberculous infection (1). Endogenous
reactivation of latent M. tuberculosis, exogenous infection with the
Koch bacillus and disease caused by mycobacteria other than M.
tuberculosis (MOTT) form a serious health problem in HIV-infection.
Predictive markers of increased risk for developing disease, other than
CD4 counts, are not defined for the moment. The purpose of this study is
to analyze T cell reactivity against Ag85 in tuberculin-negative (ID-)
and tuberculin-positive (ID+) HIV-seropositive subjects (CDC stages II
and III) and in AIDS patients (CDC IV C1 and IV C2). TABULAR DATA, SEE
ABSTRACT VOLUME. *: number of individuals that demonstrated a positive
in vitro T cell response to PPD or Ag85. In stage CDC IV C1, six
patients suffered from MOTT and all were unresponsive to PPD and Ag85.
One patient with extrapulmonary TB was reactive to PPD but not to Ag85.
These results suggest that decreased T cell reactivity against Ag85
occurs early during HIV infection, even before decreases in PPD
responsiveness can be measured. A follow-up study on the HIV+/ID+ cohort
will indicate whether T cell reactivity against the antigen can be used
as a predictive marker of mycobacterial complications.
DE Acquired Immunodeficiency Syndrome/*IMMUNOLOGY Antigens,
Bacterial/*IMMUNOLOGY AIDS-Related Opportunistic
Infections/EPIDEMIOLOGY/IMMUNOLOGY Comparative Study Human HIV
Seropositivity/*IMMUNOLOGY *Lymphocyte Transformation Mycobacterium
bovis/*IMMUNOLOGY Predictive Value of Tests Risk Factors
T-Lymphocytes/*IMMUNOLOGY Tuberculin Test
Tuberculosis/*EPIDEMIOLOGY/MICROBIOLOGY T4 Lymphocytes/*IMMUNOLOGY
MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).