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*
National Institute of Immunology, New Delhi, India; and
Regional Medical Research Centre, Bhubaneswar, India
Brutons tyrosine kinase (Btk) mutant CBA/N mice show delayed
clearance of injected microfilaria (mf) compared with wild-type CBA/J
mice. Anti-mf T cells from CBA/N mice make relatively more IFN-
than
those from CBA/J mice. The anti-mf T cell proliferative responses
are also greater in CBA/N mice. This CBA/N immune phenotype is not
restricted to filarial Ags, because immunization with pure proteins
also yields T cell responses of greater proliferative magnitude skewed
away from Th2 cytokines in CBA/N compared with CBA/J mice. The
increased magnitude of CBA/N T cell proliferative responses is
reflected in increases in both precursor frequencies and clonal burst
sizes of responding Ag-specific T cells, and is independent of the
source of re-stimulating APCs. Transfer of CBA/J peritoneal resident
cells (PRCs) into CBA/N mice before pure protein immunization leads to
a wild-type immune phenotype in the recipient CBA/N mice, with a
reduction in the proliferative response and a relative decrease in the
IFN-
produced. When wild-type PRC subpopulations are similarly
transferred, the wild-type immune phenotype is transferred by
macrophages rather than by B cells. Transfer of wild-type PRCs into
CBA/N mice before injection of mf also causes similar changes in the
anti-mf T cell responses and enhances the clearance of mf. Thus,
Btk is involved in critical macrophage APC functions regulating priming
of T cells, and can modulate these responses in pathophysiologically
relevant fashion in vivo.
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