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Cryptococcal Meningitis

Cryptococcal Meningitis

Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...

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Related Experiment Video

Updated: Jul 7, 2026

Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans

Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans

Published on: December 19, 2014

Chitosan-Deficient Cryptococcus as Whole-Cell Vaccines.

Charles A Specht¹, Woei C Lam^2,3,2, Maureen M Hester¹

¹Department of Medicine, The University of Massachusetts Chan Medical School, Worcester, MA, USA.

Methods in Molecular Biology (Clifton, N.J.)

|May 17, 2024

Summary

Developing a whole-cell vaccine using a chitosan-deficient Cryptococcus neoformans strain shows promise for preventing fungal infections. Optimizing vaccination factors like dose and route is key to maximizing efficacy in different mouse models.

Keywords:

Attenuated vaccine Cell wall Chitin deacetylase Chitosan Cryptococcosis Fungal virulence Vaccination dose Vaccination schedule Whole-cell vaccine

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Area of Science:

Mycology
Immunology
Vaccinology

Background:

Cryptococcus neoformans is a fungal pathogen causing life-threatening infections.
Developing effective vaccines is crucial for combating cryptococcosis.
Chitosan-deficient mutants of C. neoformans are avirulent and immunogenic.

Purpose of the Study:

To present detailed methods for optimizing whole-cell vaccine efficacy.
To identify factors influencing vaccine potency in different mouse strains.
To evaluate a chitosan-deficient C. neoformans strain as a vaccine candidate.

Main Methods:

Utilized a chitosan-deficient (cda1Δcda2Δcda3Δ) C. neoformans strain for whole-cell vaccination.
Administered vaccines via intranasal, orotracheal, and subcutaneous routes.
Tested vaccination protocols in three different inbred mouse strains under sedation.

Main Results:

Chitosan-deficient mutants confer protective immunity against lethal C. neoformans infection in mice.
Heat-killed derivatives of these mutants are also effective whole-cell vaccines.
Vaccine efficacy is influenced by inoculation dose, route, frequency, and mouse strain.

Conclusions:

Chitosan-deficient C. neoformans whole-cell vaccines are a viable strategy for cryptococcosis prevention.
Optimization of vaccination parameters is essential for maximizing vaccine potency.
Further research into optimizing these vaccines is warranted for clinical application.