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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: Jun 17, 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

Faster Cryptococcus Melanization Increases Virulence in Experimental and Human Cryptococcosis.

Herdson Renney de Sousa¹, Getúlio Pereira de Oliveira², Stefânia de Oliveira Frazão³

¹Faculty of Medicine, University of Brasília, Brasília 70910-900, DF, Brazil.

Journal of Fungi (Basel, Switzerland)

|April 21, 2022

Summary

The speed of melanin production by Cryptococcus pathogens is crucial for virulence. Faster melanization in Cryptococcus neoformans and Cryptococcus gattii correlates with increased disease severity and worse patient prognosis.

Keywords:

Cryptococcus neoformans Galleria mellonella LC3-associated phagocytosis capsule cryptococcosis extracellular vesicles melanin virulence

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Area of Science:

Medical Mycology
Infectious Diseases
Pathogen Virulence

Background:

Cryptococcus species are significant human pathogens responsible for over 180,000 deaths annually.
Understanding the virulence factors of Cryptococcus is critical for improving patient outcomes in cryptococcosis.

Purpose of the Study:

To systematically investigate the virulence attributes of clinical isolates of Cryptococcus neoformans and Cryptococcus gattii.
To correlate these virulence factors with patient data to better understand cryptococcosis pathogenesis.

Main Methods:

Analysis of multiple virulence phenotypes and host-pathogen interactions in 66 C. neoformans and 19 C. gattii clinical isolates.
Measurement of Cryptococcus colony melanization kinetics.
Correlation of melanization speed with LC3-associated phagocytosis evasion, Galleria mellonella virulence, and human patient prognosis.

Main Results:

Cryptococcus neoformans isolates exhibited faster and more intense melanization with thinner capsules compared to Cryptococcus gattii.
Faster melanization kinetics correlated positively with LC3-associated phagocytosis evasion.
Melanization speed was linked to increased virulence in Galleria mellonella and worse prognosis in human patients.

Conclusions:

The rate of melanization, rather than the total melanin produced, is a key determinant of Cryptococcus virulence.
Melanization speed serves as a potential biomarker for disease outcome in cryptococcosis.