Antiviral T-cell-independent type 2 antibody responses induced in vivo in the absence of T and NK cells. Journal Article uri icon



  • Polyomavirus (PyV) infection induces protective T-cell-independent (TI) IgM and IgG responses in T-cell-deficient (TCR beta x delta-/-) mice. In this study, we show that PyV is a TI -2 antigen: B cells with a mutated Bruton’s tyrosine kinase (Xid mutants) do not respond to PyV with antibody secretion in the absence of T cells. We also demonstrate that NK-cell-mediated "help" is not absolutely required for the induction of the TI-2 antibodies to PyV; thus for the first time, we provide evidence for protective IgM and IgG responses against a viral infection induced in mice lacking T and NK cells (CD3Etg). Comparison of the antibody responses observed in T- and NK-cell-deficient mice with those of mice lacking only T cells, however, suggests that NK cells may promote isotype switching to IgG2a. This effect is probably mediated by IFN gamma secretion. In support of this idea, studies on the antibody responses of PyV-infected SCID mice that had been reconstituted with IFN gamma R-/- B cells or wild-type B cells demonstrated the IFN gamma dependence of PyV-specific TI IgG2a secretion and provided evidence that IFN gamma acting directly on B cells plays an important role in TI pathways of isotype switching to IgG2a in vivo.

publication date

  • January 1, 2001

Date in CU Experts

  • October 1, 2013 11:25 AM

Full Author List

  • Szomolanyi-Tsuda E; Brien JD; Dorgan JE; Garcea RL; Woodland RT; Welsh RM

author count

  • 6

Additional Document Info

start page

  • 160-8

end page

  • 160-8


  • 280


  • 2