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Cell Immunol. 1998 Jul 10;187(1):13-8.

Enhanced antibody and cytokine responses to influenza viral antigens in perforin-deficient mice.

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Pàsteur Mérieux Connaught Canada, Research Centre, North York, Ontario, Canada.


Cytotoxic T lymphocytes (CTL) lyse virus-infected target cells by secreting the pore-forming effector molecule, perforin. Perforin-mediated cell death appears to be a major mechanism in viral clearance but its role in regulating immune responses in vivo is unclear. In this report, we show that following immunization with influenza viral antigens, perforin-deficient mice generated about 100-fold greater serum antibody responses than wild-type mice. Further, immune spleen cells from perforin knock-out mice secreted over 10-fold more IFN-gamma following in vitro restimulation than immune spleen cells from control mice. Finally, there were over 10-fold more IFN-gamma-secreting cells in cultures from perforin-deficient mice than those from control mice, suggesting that the enhanced cytokine release by T cells from perforin-deficient mice is due to an increase in the effector cell pool. Collectively, these results suggest that perforin-mediated effector function is required in the down-regulation of the immune response by way of limiting antigen-presenting cell function.

[Indexed for MEDLINE]

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