Abstract
The purpose of this study was to attempt to establish spontaneous cell-mediated cytotoxicity effector activity in the intraepithelial lymphocytes of neonatal piglets by adoptive transfer of mononuclear leukocytes from an adult donor and to determine the effect of transfer on the resistance of piglets to transmissible gastroenteritis. Cytotoxicity was determined by a chromium release assay using PK-15 cells persistently infected with transmissible gastroenteritis virus as targets. The experimental animals were inbred miniature pigs, in which a high degree of uniformity in lymphocyte defined histocompatibility complex antigens was demonstrated by the mixed lymphocyte reaction. Adoptive transfer of 8 X 10(7)-4 X 10(8) adult pig leukocytes established effector activity in eight recipient piglets, and leukocytes labelled with fluorescein isothiocyanate homed to the epithelium of the small intestine. When four recipients of 5 X 10(8) adult leukocytes were challenged with transmissible gastroenteritis virus, the onset of diarrhea was delayed for 24 h and the diarrhea was usually milder than in four untreated control piglets. It was concluded that the adoptive transfer of leukocytes with spontaneous cell-mediated cytotoxicity effector activity, which homed to the small intestinal epithelium, may have contributed to an increased resistance to transmissible gastroenteritis.
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