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| Content Provider | PubMed Central |
|---|---|
| Author | Fung, P. Y. Murphy, J. W. |
| Abstract | CBA/J mice immunized subcutaneously with emulsions of heat-killed Cryptococcus neoformans in complete Freund adjuvant displayed delayed-type hypersensitivity to cryptococcal culture filtrate antigen and developed sensitized splenic lymphoid cells which inhibited the growth of C. neoformans in vitro. The in vitro assay of growth inhibition served to investigate further the kinetics of the effect of sensitized lymphoid cells on the pathogen. There was a close correlation between the delayed-type hypersensitivity response in mice and inhibition of growth of C. neoformans by lymphoid cells. Sensitized splenic lymphocytes capable of inhibiting the growth of the cryptococci were detected at day 6 after immunization and reached maximum levels by days 8 through 16. Inhibition of growth was highest with effector-to-target cell ratios of 300:1 or greater. Inhibition of growth of C. neoformans by sensitized lymphoid cells was detectable as early as 4 h after effector and target cells were mixed and increased gradually, reaching a maximum at 24 h, but dropped significantly by 48 h. By supplementing the reaction mixtures with fresh medium or additional sensitized effector cells during incubation, the inhibition of growth of C. neoformans could be maintained through 48 h. C. neoformans-sensitized effector lymphoid populations not only inhibited the growth of the pathogen in vitro but also restricted C. neoformans proliferation in various vital organs upon transfer to naive recipient animals, indicating that the in vitro growth inhibition assay may be a means of assessing the resistance of animals to C. neoformans. The effector cells from sensitized animals were nylon wool-nonadherent Thy-1+ and Ia+ lymphocytes. |
| Starting Page | 1128 |
| File Format | |
| ISSN | 10985522 |
| e-ISSN | 10985522 |
| Journal | Infection and Immunity |
| Issue Number | 3 |
| Volume Number | 36 |
| Language | English |
| Publisher Date | 1982-06-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Infectious Diseases Parasitology Immunology Microbiology |
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