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M94A3212.TXT
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1994-10-25
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Document 3212
DOCN M94A3212
TI Clonal deletion versus clonal anergy-facts and controversies.
DT 9412
AU Salam A; Waer M; Vandeputte M; Rega Institute, Leuven, Belgium.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):128 (abstract no. PA0133). Unique
Identifier : AIDSLINE ICA10/94369363
AB The present study was undertaken to investigate the role of viral
superantigen in the process of clonal deletion and anergy in an
immuno-suppressed state in an animal model in which M1sla acted as super
antigen. HIV is reported recently to express a superantigenic characters
which are responsible for clonal anergy and depletion of CD4+ T cells
bearing VB domain. C3H(H2k,Thy1.2+,M1sla-) and AKR(H2k,Thy1.1+,M1sla+)
mice were administered a fractionated dose of Total Lymphoid Irradiation
(TLI) as a method of immuno-suppression since TLI is known as a potent
immuno-suppressive regimen. TLI treated animals were given either 15 or
30 x 15(6) Bone Marrow cells. When high numbers of donor cells were
infused clonal anergy developed (5% VB remained). When low numbers of
donor cells were infused clonal deletion occured (1% VB remained) as
detected by Flow Cytometry. Recently it was suggested that AIDS
pathogenesis was related significantly to perturbation of TCR VB domain
in HIV infected subjects. Since HIV-1 is a retrovirus and AIDS as well
as HIV infection involve same CD4+ T cells expressing VB TCR
predominantly, it would be good to say that molecules suggestive of
superantigenic features expressed by retrovirus might play a role in
inducing tolerance by clonal deletion or anergy during HIV infection. In
conclusion, though clonal deletion is the main mechanism used by
superantigen for cell depletion in a normal state, both deletion and
anergy contribute a role in an altered state.
DE Acquired Immunodeficiency Syndrome/IMMUNOLOGY Animal Bone Marrow
Transplantation/*IMMUNOLOGY Flow Cytometry Human HIV
Infections/IMMUNOLOGY Immunosuppression/METHODS *Lymphocyte Depletion
Lymphocytes/*IMMUNOLOGY/RADIATION EFFECTS Mice Mice, Inbred AKR Mice,
Inbred C3H Whole-Body Irradiation MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).