IMMUNOSTIMULATORY EFFECT OF THALIDOMIDE IN NORMAL C57BL 6 MICE IS COMPATIBLE WITH STIMULATION OF A HIGHLY CONNECTED CENTRAL IMMUNE-SYSTEM .1./

Although thalidomide has been used with success in the treatment of in creasing numbers of autoimmune diseases, the therapeutic effects have not been satisfactorily explained so far. We describe here some findin gs that may contribute to a better understanding of the immunomodulato ry effects of this drug. Several immunological changes were observed a fter treating C57BL/6 mice with 3 mg of thalidomide. The numbers of na tural IgM PFC against sheep red blood cells were increased in the sple en, and occasionally a dramatic oscillatory increase in the numbers of non-specific splenic IgM and IgG PFC was observed in these mice. Howe ver, these oscillatory increases were progressively lower, after two a nd three treatments with thalidomide at 20-day intervals. Furthermore, the absolute numbers of splenic CD5(+) B and CD5(-) B lymphocytes wer e increased whereas depletion of CD4(+) CD8(+) cells in the thymus and of lymphoid cells in the bone marrow was seen after a single treatmen t with 3 mg of thalidomide. Taken together, these results suggest that thalidomide stimulates both peripheral and central immune systems and consequently enhances the connectivity of the central immune system.