Abstract
The phenotype of T-helper cells conferring protection against Trichinella spiralis (Ts) was studied using adoptive transfer procedures and T-helper cell subsets isolated by monoclonal antibodies. With these techniques OX8- OX22+ and OX8- OX22- T-helper cell populations were isolated from thoracic duct lymph (TDL) of infected rats three-five-fold more concentrated than in unfractionated lymph. The OX8- OX22- cell subset alone transferred enhanced rejection of adult worms from the intestine. The origin of protective OX8- OX22- cells was examined in mesenteric lymphadenectomized (MX) rats. After MX, protective cells were found in the cell population draining directly from the intestine on Days 2-3 after infection. Protective cells first appeared in the mesenteric lymph node (MLN) and efferent lymph at Day 3. MX rats rejected T. spiralis at the same time as intact controls and showed enhanced rejection when immune TDL were transfused. No evidence was found for a direct role of the MLN in the generation or expression of parasite rejection. Depletion of migrating OX8- OX22- blast cells by 48-hr drainage of TDL did not influence the expression of an anamnestic response to challenge infection. This suggests that an intestinally resident cell population has a substantial role in mediating primary worm rejection and anamnestic immunity. Day 2 OX8- OX22- cells from MX rats proliferated in response to the presentation of adult and muscle larvae antigens in vitro. We conclude that protection resides in the OX8- OX22- T-helper cell subset that is produced and functions in the intestine.
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