Temperature mediated processes in teleost immunity: differential abilities of channel catfish T and B lymphocytes to cap membrane antigen.
1. The effect of both in vivo acclimation temperature and in vitro assay temperatures on channel catfish T and B lymphocyte membrane antigen (mAg) capping were investigated to determine if capping might be the temperature sensitive step involved in the low temperature immunosuppression of channel catfish T cell responses. 2. Flow cytometry was used to monitor the kinetics of capping induced by a mouse monoclonal antibody (mAb 11G3) specific for a common antigenic determinant present on channel catfish T and B cells. Results indicated that the kinetics of mAg capping were dependent on in vitro assay and in vivo acclimation temperatures and the length of time of in vivo acclimation. 3. T cells from fish appropriately acclimated to 27 degrees C cap mAg more efficiently at low assay temperatures than do B cells. 4. Activation energies were 32 and 47 kcal/mol for B and T cells, respectively, from fish acclimated to 17 degrees C for 3 weeks, but were significantly lower (14 and 22 kcal/mol, respectively) after acclimation for 5 weeks. 5. In summary, it appears that after appropriate in vivo acclimation, channel catfish T cells are better able to cap mAg at low assay temperatures than are B cells. These results suggest that mAg capping is not the low temperature sensitive step involved in T cell immunosuppression in channel catfish.
D000064:Acclimatization; D000818:Animals; D000911:Antibodies, Monoclonal; D000954:Antigens, Surface / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D002397:Catfishes / Q000276:immunology*; D005455:Fluorescent Antibody Technique; D007059:Ictaluridae / Q000276:immunology*; D007152:Immunologic Capping; D013601:T-Lymphocytes / Q000276:immunology*; D013696:Temperature; D013816:Thermodynamics
D000911:Antibodies, Monoclonal; D000954:Antigens, Surface