title: Deficiency of interleukin 2 inhibitor activity in serum from autoimmune-prone mice.
abstract: To study the mechanisms that regulate the activity of interleukin 2 (IL 2) and possibly limit its activity, we have examined normal mouse serum for their ability to inhibit IL 2-mediated proliferation of a cloned IL 2-dependent cytotoxic T lymphocyte line (CTLL). Normal mouse serum contains a factor capable of inhibiting IL 2 dependent proliferation of CTLL cells. This factor is absorbed with IL 2-dependent cells, but not with IL 2 molecules. Decreased activity of the inhibitor is observed in serum from autoimmune-prone mice such as NZB and NZBWF 1 hybrid mice. The results suggest that the serum IL 2 inhibitor may play an important role in the in vivo regulatory mechanism of IL 2 activity and that lack of the inhibitor may be associated with aberrant immune functions.
mesh_terms: D000818:Animals; D001327:Autoimmune Diseases / Q000276:immunology*; D007376:Interleukin-2 / Q000037:antagonists & inhibitors*; D008213:Lymphocyte Activation; D051379:Mice; D008815:Mice, Inbred Strains
chemical_list: D007376:Interleukin-2