Send to

Choose Destination
Clin Vaccine Immunol. 2011 May;18(5):717-23. doi: 10.1128/CVI.00036-11. Epub 2011 Mar 30.

Protective immunity against experimental pulmonary cryptococcosis in T cell-depleted mice.

Author information

Department Biology, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249-0062, USA.


Individuals with defects in T cell-mediated immunity (CMI) are highly susceptible to infection with Cryptococcus neoformans. The purpose of these studies was to determine if protection against experimental pulmonary cryptococcosis can be generated in T cell-deficient hosts. BALB/c mice were depleted of CD4⁺and/or CD8⁺ T cells or given an isotype control antibody prior to vaccination with a C. neoformans strain, designated H99γ, previously shown to induce protection against C. neoformans infection in immunocompetent mice. Mice depleted of CD4⁺ or CD8⁺ T cells, but not both subsets, survived an acute pulmonary infection with C. neoformans strain H99γ and a subsequent second challenge with wild-type C. neoformans strain H99. We observed a significant increase in the percentage of CD4⁺ and CD8⁺ T cells expressing the activation marker CD69 in the lungs of mice immunized with C. neoformans strain H99γ prior to a secondary challenge with wild-type cryptococci. CD4⁺ T cells within the lungs of immunized mice also appeared to acquire a predominantly activated effector memory cell phenotype (CD69⁺ CD44⁺ CCR7⁻ CD45RB⁻ CD62L⁻) following a second pulmonary challenge with wild-type C. neoformans, compared to CD4⁺ T cells from naïve mice. Lastly, immunization of immunocompetent mice with C. neoformans strain H99γ prior to depletion of CD4⁺ and/or CD8⁺ T cells resulted in significant protection against a second challenge with wild-type C. neoformans. Our studies demonstrate that protective immunity against pulmonary cryptococcosis can be generated in immunosuppressed hosts, thus supporting the development of cryptococcal vaccines.

[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for HighWire Icon for PubMed Central
Loading ...
Support Center