Bromocriptine and low dose cyclosporine in the treatment of experimental autoimmune uveitis in the rat.

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Abstract
The immunologic effects of bromocriptine and low dose cyclosporine on experimental autoimmune uveitis (EAU) induced in Lewis rats by S-antigen immunization were studied. Rats treated with a sub-optimal dose (low dose) of cyclosporine (2 mg/kg per d), bromocriptine (1.8 mg/kg per d), or both drugs were compared with untreated rats in regard to the development of EAU, lymphocyte proliferative responses, and anti-S-antigen serum antibodies. Bromocriptine alone decreased the incidence of EAU only in female rats (P less than 0.01), did not effect the lymphocyte proliferative response, but did significantly decrease antibody titers in both males (P less than 0.004) and females (P less than 0.0005). Low dose cyclosporine also partially decreased the incidence of EAU in female rats, but did not decrease antibody titers or lymphocyte proliferative responses. Bromocriptine plus low-dose cyclosporine led to more marked decreases in the incidence of EAU and anti-S-antigen antibody titers as well as in the lymphocyte proliferative assay (P less than 0.01 for males, P less than 0.0005 for females). This study suggests that bromocriptine can enhance the immunosuppression of low dose cyclosporine.