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1996-02-26
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Document 1015
DOCN M9621015
TI T cell blastogenic responses to Toxoplasma gondii trophozoites among
HIV-infected patients.
DT 9602
AU Carrega G; Canessa A; Argenta P; Cruciani M; Bassetti D; Department of
Infectious Diseases, University of Genoa, Italy.
SO AIDS Res Hum Retroviruses. 1995 Jun;11(6):741-6. Unique Identifier :
AIDSLINE MED/96078235
AB OBJECTIVE: To evaluate the cell-mediated immune response to Toxoplasma
gondii (T. gondii) among HIV-infected patients. METHODS: Forty
HIV-infected patients were studied. Of them, 35 had antibodies to T.
gondii and 5 had not. Nine of 35 patients with detectable serum
Toxoplasma antibodies were classified as group A1 (CDC 1993), 10 as
group B2, 6 as group B3, and 10 as group C3. Peripheral blood
mononuclear cells (PBMCs) were obtained by Ficoll-Hypaque gradient
centrifugation. Living Toxoplasma gondii trophozoites, herpes simplex
virus (HSV), tetanus toxoid, and phytohemoagglutinin (PHA) were used in
standard proliferation assays. Toxoplasma-responding blasts were
expanded and assayed for antigen specificity and HLA restriction by
proliferation assays. T cell subsets were analyzed using two-color flow
cytometry. RESULTS: Among patients with detectable Toxoplasma serum
antibodies, significant PBMC proliferation in response to T. gondii
trophozoites was observed in those classified in group A1 or B2 but not
in those in groups B3 and C3. Toxoplasma-induced blasts from five of six
patients after 7 days of culture and from five patients after 15 days of
culture proliferated in response to T. gondii in the presence of either
autologous or allogeneic PBMCs as antigen-presenting cells (APCs) and/or
also proliferated in response to HSV. The surface markers of T.
gondii-induced blasts showed a variable percentage of CD4 and CD8
activated cells. CONCLUSIONS: T cell proliferative response to living
trophozoites of T. gondii is lost only in patients with severe depletion
of CD4 cells. PBMC proliferation was observed only in patients with
previous T. gondii infection, but the T cell blasts generated showed a
strong alloreactivity (proliferating in response to allogeneic
irradiated PBMCs) and were apparently not antigen specific
(proliferating also in response to HSV).
DE Adult Animal Antibodies, Protozoan/BLOOD Antigen-Presenting
Cells/IMMUNOLOGY Antigens, CD/ANALYSIS CD4-CD8 Ratio CD4-Positive
T-Lymphocytes/*IMMUNOLOGY CD8-Positive T-Lymphocytes/*IMMUNOLOGY
Female Human HIV Infections/*IMMUNOLOGY Leukocytes,
Mononuclear/IMMUNOLOGY *Lymphocyte Transformation/DRUG EFFECTS Male
Middle Age Phytohemagglutinins/PHARMACOLOGY Simplexvirus/IMMUNOLOGY
Support, Non-U.S. Gov't T-Lymphocyte Subsets Tetanus
Toxoid/PHARMACOLOGY Toxoplasma/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).