LOSS OF LYMPHOCYTE CHALONE ACTIVITY IN MICE WITH AUTO-IMMUNE DISEASE

Lymphocyte chalone from the spleens of old BALB/c, young BALB/c and young NZB mice caused significant suppression of the proliferative response of BALB/c and NZB spleen cells to T and B mitogens, whereas lymphocyte chalone from old NZB spleen did not suppress. Lymphocyte chalone from young and old NZB mice was tested using different ages of NZB/NZW responding spleen cells; at all ages concanavalin A- and lipopolysaccharide-induced proliferation was suppressed less by the chalone from old NZB mice than from that of young NZB mice. The responding NZB/NZW cells were suppressed equivalently at all ages studied. The basis for the loss of lymphocyte chalone activity in old NZB mice remains unknown; however, it appears likely that this event has a role in the disturbance of the negative feedback control system which contributes to NZB autoimmune disease.