title: Reactivity of subpopulations of mouse spleen cells to concanavalin A in vitro.
abstract: Subpopulations of spleen cells of mice bearing virus-induced mammary tumors were assessed for responsiveness to Concanavalin A (Con A) under in vitro xenogeneic and syngeneic culture conditions. When cultured with human A+ plasma (xenogeneic), spleen cells of normal, nontumor-bearing BALB/c mice exhibited a high degree of synthesis as compared to unstimulated cells in response to Con A. Spleen cells of mice inoculated with tumor exhibited response exceeding that of their normal counterparts by 59%. When normal BALB/c sera (syngeneic) was used as the supplement, no response of normal spleen cells was observed upon stimulation by Con A; however, spleen cells from tumour bearing individuals demonstrated heightened activity. Tumor-bearer spleen cell response to Con A of mice inoculated with 1 X 10(6) viable cells was biphasic. The peak of the first phase appeared as early as 10 days postinoculation and declined within 3 days after its appearance. The peak of the second phase appeared within 6 days following decline of the first and declined drastically within 3 days after its appearance. Coincidental with the onset of the second phase, the tumor became ulcerated, purulent, and necrotic. Both phases were predominantly T-cell mediated.
mesh_terms: D000818:Animals; D003208:Concanavalin A / Q000494:pharmacology*; D004247:DNA / Q000096:biosynthesis; D066298:In Vitro Techniques; D007700:Kinetics; D008213:Lymphocyte Activation; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000276:immunology* / Q000378:metabolism
chemical_list: D003208:Concanavalin A; D004247:DNA