title: Proliferative response of T lymphocytes to a proline-rich polypeptide (PRP): PRP mimics mitogenic activity of Il-1.
abstract: Mitogenic properties of a proline-rich polypeptide were investigated. The mitogenic action of PRP was compared with the mitogenic action of Il-1. PRP was not mitogenic for thymocytes at doses 0.01-50 micrograms/ml. PRP, at doses 0.1-50 micrograms/ml, augmented the proliferative response of thymocytes to Con A in a similar fashion as Il-1. At doses higher than 10 micrograms/ml, PRP induced proliferation of lymph node cells and splenocytes as well as T cells from the lymph nodes. It did not, however, cause significant proliferation of B cells from the lymph nodes, at the doses used. PRP did not induce proliferation of an antigen specific Lyt 1+ T cell clone. Il-1 behaved in a similar way as PRP in all the tests described. We consider a possibility that under physiological conditions, at a very early stage of postneonatal life, PRP may replace some functions of Il-1.
mesh_terms: D000818:Animals; D003208:Concanavalin A / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005260:Female; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000494:pharmacology; D008198:Lymph Nodes / Q000187:drug effects / Q000276:immunology; D008213:Lymphocyte Activation / Q000187:drug effects*; D051379:Mice; D008815:Mice, Inbred Strains; D008934:Mitogens; D010455:Peptides / Q000008:administration & dosage / Q000494:pharmacology*; D055232:Proline-Rich Protein Domains; D013154:Spleen / Q000187:drug effects / Q000276:immunology; D013601:T-Lymphocytes / Q000187:drug effects* / Q000276:immunology
chemical_list: D007375:Interleukin-1; D008934:Mitogens; D010455:Peptides; D003208:Concanavalin A