title: Sequential precipitation of mouse thymocyte extracts with anti-Lyt-2 and anti-Lyt-3 sera. I. Lyt-2.1 and Lyt-3.1 antigenic determinants reside on separable molecular species.
abstract: Anti-Lyt-2.1 and anti-Lyt-3.1 sera were employed for sequential precipitation of NP-40 extracts of 125I-labeled C57BL/6-Lyt-2a, Lyt-3a thymocytes (Lyt-2.1, Lyt-3.1) to determine whether these alloantigenic determinants are present on the same or different molecular species. Treatment of extracts with anti-Lyt-3.1 serum and SaCI completely precipitated both Lyt-3.1 and Lyt-2.1-specific components, whereas treatment with anti-Lyt-2.1 serum reduced by approximately 37% the quantity of labeled species subsequently precipitable by anti-Lyt-3.1 serum. When 125I-labeled thymocytes were subjected to mild trypsinization before NP-40 extraction, the quantity of radioactive components precipitated by anti-Lyt-2.1 serum was essentially unchanged, but that of anti-Lyt-3.1-precipitable components was greatly reduced. Moreover, sequential precipitation of extracts of trypsinized thymocytes with anti-Lyt-2.1 and anti-Lyt-3.1 sera demonstrated that these molecular species were precipitated independently. Thus 1) Lyt-2.1 and Lyt-3.1 antigenic determinants appear to reside on different molecular species; 2) some Lyt-2.1- and Lyt-3.1-positive molecules appear to be complexed with each other in the NP-40 extract; and 3) this association of Lyt-2.1- and Lyt-3.1-positive species was dependent upon components that were labile to trypsinization of intact thymocytes.
mesh_terms: D000042:Absorption; D000818:Animals; D000961:Antilymphocyte Serum / Q000494:pharmacology*; D011232:Chemical Precipitation; D000939:Epitopes; D051379:Mice; D008810:Mice, Inbred C57BL; D013601:T-Lymphocytes / Q000276:immunology; D013949:Thymus Extracts / Q000276:immunology*; D013997:Time Factors; D014357:Trypsin / Q000494:pharmacology
chemical_list: D000961:Antilymphocyte Serum; D000939:Epitopes; D013949:Thymus Extracts; D014357:Trypsin