Abstract
Severe combined immunodeficiency (SCID) mice with ill-developed Peyer's patches develop neither antibodies nor protection against lethal herpes simplex virus type 1 (HSV-1) infection by oral immunization. However, SCID mice carrying spleen cells from immunocompetent BALB/c mice had serum anti--HSV-1 antibody; anti--HSV-1 IgA antibody was detected in eye wash samples, and the mice were protected against lethal HSV-1 infection (88% survival rate). Western blotting showed that antibodies in SCID mice carrying spleen cells from BALB/c mice recognized 60-kDa HSV-1. The effector cells in transferred spleen cells were CD4(+), not CD8(+), T cells. Donor T cells were detected in the submucosal layer of the gut in SCID mice 1 day after transfer. Rapid movement of donor T cells to the gut may have a role in mucosal immunity to HSV-1. Thus, the normal environment for mucosal immunity develops in SCID mice without prior presence of CD4(+) T cells.
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