title: Macrophage Ia expression in athymic nude versus neonatally thymectomized mice.
abstract: The requirement of the thymus for the production of Ia-inducing lymphokine was studied in athymic nude, neonatally thymectomized (NTx), and sham-operated (Sham) mice. The peritoneal macrophages from NTx mice immunized with viable Listeria monocytogenes 14 days previously contained as high a proportion of Ia-bearing macrophages as those from Sham mice, while those from athymic nude mice contained only a small proportion. Intraperitoneal injection of a culture supernatant derived from immune spleen cells of NTx mice induced Ia-rich exudates in recipient normal mice just as well as did a corresponding supernatant from cells of Sham mice, but that from cells of athymic nude did not. The production of Ia-inducing lymphokine in culture supernatants of immune spleen cells from both NTx and Sham mice was abolished by pretreatment of cells with anti-Thy-1.2 antibody plus complement. These results suggest that a T cell subset responsible for the production of Ia-inducing lymphokine requires the presence of the thymus for just a short period in the ontogenic development.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002478:Cells, Cultured; D005802:Genes, MHC Class II; D008089:Listeria monocytogenes / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude / Q000276:immunology*; D013045:Species Specificity; D013154:Spleen / Q000276:immunology; D013934:Thymectomy; D013950:Thymus Gland / Q000276:immunology