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Infection and Immunity, January 2000, p. 352-359, Vol. 68, No. 1
0019-9567/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Depletion of CD8+ T Cells In Vivo Impairs Host Defense of Mice Resistant and Susceptible to Pulmonary Paracoccidioidomycosis

Luz E. Cano,dagger Lúcia M. Singer-Vermes, Tania A. Costa, José O. Mengel, Cynthia F. Xidieh, Celina Arruda, Denise C. André, Celidéia A. C. Vaz, Eva Burger, and Vera L. G. Calich*

Departamento de Imunologia, Instituto de Ciências Biomédicas da Universidade de São Paulo, São Paulo, Brazil

Received 12 April 1999/Returned for modification 7 May 1999/Accepted 7 October 1999

Using a pulmonary model of infection, we demonstrated previously that A/Sn and B10.A mice are, respectively, resistant and susceptible to Paracoccidioides brasiliensis infection. Employing the same experimental model, we examined herein the role of CD8+ T cells in the course of paracoccidioidomycosis. Treatment with anti-CD8 monoclonal antibodies caused a selective depletion of pulmonary and splenic CD8+ T cells in both mouse strains. The number of pulmonary CD4+ T cells and immunoglobulin-positive cells was independent of the number of CD8+ T cells. In susceptible mice, the loss of CD8+ T cells by in vivo treatment with anti-CD8 monoclonal antibodies impaired the clearance of yeasts from the lungs and increased the fungal dissemination to the liver and spleen. The same treatment in resistant mice increased fungal dissemination to extrapulmonary tissues but did not alter the pulmonary fungal load. Furthermore, CD8+ T-cell depletion did not modify delayed-type hypersensitivity reactions of A/Sn mice but increased these reactions in B10.A mice. The production of P. brasiliensis-specific antibodies by resistant and susceptible mice depleted of CD8+ T cells was similar to that of mice given control antibody. Histopathologically, depletion of CD8+ T cells did not disorganize the focal granulomatous lesions developed by both mouse strains. These results indicate that CD8+ T cells are necessary for optimal clearance of the fungus from tissues of mice infected with P. brasiliensis and demonstrate more prominent protective activity by those cells in the immune responses mounted by susceptible animals.

* Corresponding author. Mailing address: Depto. de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Av. Prof. Lineu Prestes 1730, Cep 05508-900, São Paulo SP, Brazil. Phone: 55-11-818 7397. Fax: 55-11-818 7224. E-mail: vlcalich{at}icb.usp.br.

dagger Present address: Laboratório de Micologia Experimental, Corporación para Investigaciones Biológicas (CIB), Medellín, Colombia.

Infection and Immunity, January 2000, p. 352-359, Vol. 68, No. 1
0019-9567/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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