Changes in the subsets of CD4 + T cells in Trypanosoma musculi infection: delay of immunological cure in young mice and the weak ability of aged mice to control the infection
| Autor: | Mansanori Utsuyama, Joseph F. Albright, Katsuiku Hirokawa, Kevin L. Holmes, Julia W. Albright |
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| Rok vydání: | 1994 |
| Předmět: |
CD4-Positive T-Lymphocytes
Interleukin 2 Aging Lymphocyte T cell Immunology Population Enzyme-Linked Immunosorbent Assay Lymphoid hyperplasia Mice Immune system T-Lymphocyte Subsets Trypanosomiasis Aldesleukin medicine Animals Immunology and Allergy education Cells Cultured Mice Inbred C3H education.field_of_study biology General Medicine Flow Cytometry medicine.anatomical_structure biology.protein Interleukin-2 Interleukin-4 medicine.symptom Antibody Spleen medicine.drug |
| Zdroj: | International Immunology. 6:1107-1115 |
| ISSN: | 1460-2377 0953-8178 |
| DOI: | 10.1093/intimm/6.8.1107 |
| Popis: | After a 3 week course (approximately), during which there is marked lymphoid hyperplasia, Trypanosoma musculi infections in young-adult mice are cured by an immune mechanism involving antibodies of the IgG2a isotype. Both the lymphoid hyperplasia and IgG2a antibody response are T-cell-dependent events and both processes appear to be defective in aged mice. The purpose of the studies reported here was to elucidate the effects of T. musculi infection on subsets of T cells for two reasons: (i) to gain insight into the probable roles of selected cytokines (IL-2, IL-4 and IFN-gamma) in facilitating the production of curative, IgG2a antibodies, and (ii) to examine the hypothesis that aging affects the competence of CD4+ T cells to participate in immunological control of infections. The major conclusions from these studies are that: (i) T. musculi infection of mice induces rapid change in the CD4+ T cell population toward predominance of the activated or memory (CD45RBloCD44hi) phenotype, cells which produce IFN-gamma, II-3, IL-4 and IL-5, accompanied by profound inhibition of IL-2 production, and (ii) in the old mice these changes are superimposed on the natural age-associated changes in the same direction (i.e. toward predominance of CD45RBloCD44hi T cells). Thus, in the old animals, the combined changes of aging and infection, moving in the same direction, are devastating, resulting in the aged animals being unable, or barely able, to control infection. |
| Databáze: | OpenAIRE |
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