Population dynamics of T and B lymphocytes in the lymphoid organs, circulation, and granulomas of mice infected with Schistosoma mansoni.
The T and B lymphocyte composition of the lymphoid organs, peripheral blood, and hepatic granulomas was determined in mice lightly infected with Schistosoma mansoni. Apart from an increase of circulating B cells, no change was seen in the distribution of lymphocytes prior to oviposition. Thereafter (8-20 weeks), a pronounced trend toward increased B and increased T cell percentages occurred throughout the organs. This effect was largely due to marked increases in the B cell population which outweighed increases of T cells occurring at 8 and 16 weeks. By the late chronic period (32 weeks), an overall normalization of percentages was observed due to declining B and/or increasing T cell numbers. Hepatic granulomas also showed notable compositional changes. At the time of maximum granulomatous response (8 weeks), the lymphocyte population of these lesions consisted primarily of T cells. Subsequently, during the time of modulated granuloma formation (12-32 weeks), B-cells became a significant component, comprising 10% of the granuloma cell population. The appearance of B cells within granulomas may indicate that they play a role in modulating granulomatous hypersensitivity.
D000818:Animals; D001402:B-Lymphocytes; D005260:Female; D006099:Granuloma / Q000503:physiopathology*; D007111:Immunity, Cellular; D008198:Lymph Nodes / Q000503:physiopathology; D008214:Lymphocytes; D008221:Lymphoid Tissue / Q000503:physiopathology*; D051379:Mice; D008808:Mice, Inbred CBA; D012550:Schistosoma mansoni; D012552:Schistosomiasis / Q000503:physiopathology*; D013154:Spleen / Q000503:physiopathology; D013601:T-Lymphocytes