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Visualizing Non-lytic Exocytosis of Cryptococcus neoformans from Macrophages Using Digital Light Microscopy

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Published on: October 21, 2014

Vesicle-associated melanization in Cryptococcus neoformans.

Helene C Eisenman¹, Susana Frases¹, André M Nicola^2,1

¹Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York 10461, USA.

Microbiology (Reading, England)

|September 5, 2009

Summary

This summary is machine-generated.

Extracellular vesicles contribute to melanin production in the pathogenic fungus Cryptococcus neoformans. These vesicles incorporate melanin precursors, aiding in the formation of uniform melanin particles in the cell wall.

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Area of Science:

Mycology
Biochemistry
Cell Biology

Background:

Pathogenic fungi produce extracellular vesicles containing virulence factors.
Cryptococcus neoformans synthesizes melanin via laccase, forming spherical granules in its cell wall.
Melanin synthesis in metazoans occurs in vesicular melanosomes.

Purpose of the Study:

Investigate the role of extracellular vesicles in Cryptococcus neoformans melanization.
Determine if vesicles contribute to melanin granule formation.

Main Methods:

Incubation of extracellular vesicles with L-3,4-dihydroxyphenylalanine (L-DOPA).
Analysis of radiolabeled L-DOPA incorporation into cells and vesicles.
Staining of acid-generated melanin ghosts with lipophilic dyes.

Main Results:

Extracellular vesicles were successfully melanized when incubated with L-DOPA.
Substrate incorporation kinetics differed between cells and isolated vesicles.
Melanin ghosts indicated the presence of lipids associated with vesicles.

Conclusions:

Extracellular vesicles play a role in Cryptococcus neoformans melanization.
A model is proposed for vesicle-mediated melanin assembly into cell wall granules.