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1996-02-26
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Document 0986
DOCN M9620986
TI Th1 and Th2 help for B cells: differential capacity for induction of
autonomous responsiveness to IL-2.
DT 9602
AU Poudrier J; Owens T; Department of Medicine, McGill University,
Montreal, Quebec,; Canada.
SO Int Immunol. 1995 Jun;7(6):1021-7. Unique Identifier : AIDSLINE
MED/96082369
AB Sustained interaction with Th1 cells has been shown to induce IL-2
responsiveness by murine B cells. This is equivalently dependent on
CD40, CD54/ICAM-1 and MHC II ligation, and co-cross-linking of CD54 and
MHC II in the presence of IL-5 up-regulates a functional IL-2R on B
cells. We now show that IL-5 (125 U/ml) synergizes with Th1 cells to
induce B cell responses to IL-2, that are maintained following T-cell
removal, e.g. autonomous. Th1 help in the absence of IL-5 resulted in
weak or undetectable responses following T cell removal. The mechanism
of IL-5 synergy involved persistence of IL-2R beta expression following
T cell removal, as opposed to enhancement of IL-2R induction or
function. The level of contact-induced IL-2R expression on B cells was
not itself modified by IL-5. The effects of IL-5 did not overcome the
requirement for T contact signals and treatment of B cells with soluble
anti-Ig did not circumvent the need for IL-5 for autonomous IL-2
responses. Consistent with the above, interaction with an IL-5-producing
Th2 clone induced strong autonomous B cell responses to IL-2.
Qualitative differences of Th2 help over that of Th1 may thus be
attributable to their differential ability to induce autonomous B cell
responsiveness to cytokines. This may be representative of events in
which maintenance of cell cycle is important, as is the case in germinal
centers.
DE Animal B-Lymphocytes/*IMMUNOLOGY/METABOLISM Cells, Cultured
Comparative Study Drug Synergism Female Immunoglobulins,
Surface/PHARMACOLOGY Interleukin-2/*PHARMACOLOGY
Interleukin-5/PHARMACOLOGY Lymph Nodes/IMMUNOLOGY *Lymphocyte
Cooperation Lymphocyte Transformation Mice Mice, Inbred BALB C Mice,
Inbred C57BL Receptors, Interleukin-2/METABOLISM Support, Non-U.S.
Gov't Th1 Cells/*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).