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1996-02-26
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Document 0644
DOCN M9620644
TI Evidence for Th2 cell-mediated suppression of antibody responses in
transgenic, beef insulin-tolerant mice.
DT 9602
AU Teng YT; Gorczynski RM; Iwasaki S; Williams DB; Hozumi N; Samuel
Lunenfeld Research Institute, Mount Sinai Hospital,; Toronto, Canada.
SO Eur J Immunol. 1995 Sep;25(9):2522-7. Unique Identifier : AIDSLINE
MED/96011861
AB Clonal deletion, anergy and suppression have all been considered
mechanisms of immunological tolerance. Although adoptive transfer of
immunosuppression has been shown to occur in the periphery, particularly
for transplantation tolerance, it has proven difficult to characterize
this phenomenon further, due to the lack of suppressor T cell clones. To
characterize tolerance towards a physiological soluble antigen, we
constructed beef insulin (BI) transgenic (Tg) BALB/c (H-2d) mice, in
which the BI transgene is expressed in pancreatic beta cells. These Tg
mice were tolerant to BI immunization at the level of both humoral and
cell-mediated immune responses. Adoptive transfer of splenocytes from Tg
mice into normal syngeneic BALB/c mice demonstrated that the reduction
in antibody production is regulated by transferred T cells. The cytokine
profile of T cell clones obtained after selection in vitro demonstrated
dominant Th1 clones from normal non-Tg mice and dominant Th2 clones from
Tg mice. Some Th2 clones (CD4+) from Tg mice produced significant
suppression of antibody production after adoptive transfer into normal
syngeneic BALB/c mice. These data confirm the existence of Th2
regulatory T cells in vivo in a model of peripheral tolerance to a
physiological soluble antigen as a potential mechanism for self
tolerance.
DE Animal Antibody Formation Cattle Clone Cells Immunotherapy, Adoptive
Insulin Resistance/*IMMUNOLOGY Mice Mice, Inbred BALB C Mice,
Transgenic Spleen/*IMMUNOLOGY Support, Non-U.S. Gov't T-Lymphocyte
Subsets/IMMUNOLOGY Th2 Cells/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).