Radioautographic studies of plaque-forming cells. I. Antigen-stimulated proliferation of plaque-forming cells.
A method has been described for obtaining radioautographs of plaque-forming cells. The method permits radioautographic analyses of small numbers of plaque-forming cells amidst large populations of non-plaque-forming cells. Spleen cells that were pulse-labeled with tritiated thymidine could be categorized readily as labeled or not labeled. Using this method it was found that (a) at least 55% of plaque-forming cells which appear 3 days after a maximal stimulus of 4 x 10(8) sheep red cells are still capable of DNA synthesis, and must have arisen by cell proliferation; (b) the rate of proliferation of plaque-forming cells is proportional to the log of the dose of antigen; (c) the S period of plaque-forming cells is at least 2 hr, appears to be constant, and is not influenced by antigen dose. The results suggest that antigen stimulates proliferation of plaque-forming cells by hastening their transit through the G(1) phase of the generative cycle.
D000818:Animals; D000941:Antigens; D001345:Autoradiography; D002455:Cell Division; D004247:DNA / Q000096:biosynthesis; D004912:Erythrocytes / Q000378:metabolism; D006652:Histological Techniques; D008297:Male; D008722:Methods; D051379:Mice; D013154:Spleen / Q000166:cytology* / Q000276:immunology; D013936:Thymidine; D014316:Tritium
D000941:Antigens; D014316:Tritium; D004247:DNA; D013936:Thymidine