An attenuated variant of Coxsackievirus B3 preferentially induces immunoregulatory T cells in vivo.
AUTOR(ES)
Loudon, R P
RESUMO
BALB/c mice infected with the Woodruff variant of coxsackievirus group B type 3 (CVB3W) develop myocarditis mediated by autoimmune cytolytic T lymphocytes. A variant of CVB3W (designated H3-10A1) which infects the myocardium but induces minimal mortality of myocarditis compared to the parental virus was selected. Although H3-10A1 infections stimulate normal CTL responses to CVB3-infected myocytes, the autoimmune response to myocardial antigens is absent. Treatment of H3-10A1-infected mice with 50 mg of cyclophosphamide per kg of body weight, a treatment which preferentially eliminates suppressor cells, allows both the development of the autoimmune cytotoxic T-lymphocyte response and the expression of myocarditis. Similar treatment of CVB3W-infected mice had no effect on the disease. The presence of the immunoregulatory cells was confirmed by adoptive transfer of T lymphocytes from either H3-10A1 or CVB3W-infected donor mice into syngeneic CVB3W-infected recipients. Animals given H3-10A1-immune cells had minimal myocardial inflammation, while animals given CVB3W-immune lymphocytes developed enhanced cardiac disease. Elimination of the T-lymphocyte population from the donor cells prior to transfer abrogated suppression with the H3-10A1-immune population, showing that immunoregulation depended upon T lymphocytes. Both H3-10A1 and CVB3W have cross-reactive epitopes between the adenine translocator protein and the virion which are indicative of antigenic mimicry and may be the basis for the autoimmunity to cardiac antigens. These results suggest that immunoregulatory T cells may be primarily responsible for the nonpathogenicity of the H3-10A1 variant.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=250243Documentos Relacionados
- Selection of an attenuated Coxsackievirus B3 variant, using a monoclonal antibody reactive to myocyte antigen.
- Expression of Immunoregulatory Cytokines by Recombinant Coxsackievirus B3 Variants Confers Protection against Virus-Caused Myocarditis
- γδ T Cells Promote a Th1 Response during Coxsackievirus B3 Infection In Vivo: Role of Fas and Fas Ligand
- Altered receptor specificity of coxsackievirus B3 after growth in rhabdomyosarcoma cells.
- Specific Alterations of Coxsackievirus B3 Eluted from Hela Cells 1