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Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans
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Cell-wall dyes interfere with Cryptococcus neoformans melanin deposition.

Ricardo Perez-Dulzaides1, Emma Camacho1, Radames J B Cordero1

  • 1Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.

Microbiology (Reading, England)
|June 26, 2018
PubMed
Summary

Melanization in Cryptococcus neoformans was studied using cell-wall dyes. The dyes blocked melanin attachment, allowing characterization of released melanin nanoparticles and supporting a cell-wall attachment model.

Keywords:
Eosin YUvitexfungalleaky melaninmelaninmelanin anchorvesicles

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Area of Science:

  • Mycology
  • Biochemistry
  • Cell Biology

Background:

  • Melanization is a common fungal trait, but its mechanisms remain unclear due to melanin's complex nature.
  • Melanins are pigments crucial for fungal survival, offering protection against various environmental stressors.

Purpose of the Study:

  • To investigate the process of fungal melanization using Cryptococcus neoformans.
  • To characterize melanin released into the supernatant by interfering with its cell-wall attachment.

Main Methods:

  • Utilized cell-wall dyes (Eosin Y, Uvitex) to study dye binding to melanized and non-melanized fungal cells.
  • Cultured Cryptococcus neoformans under melanizing conditions in the presence of cell-wall dyes.
  • Analyzed melanin particles in culture supernatants using microscopy and dimensional analysis.

Main Results:

  • Melanization reduced cell-wall dye fluorescence, indicating interference with dye binding.
  • Cell-wall dyes increased supernatant-associated melanin, suggesting blocked attachment to the cell wall.
  • Released melanin particles exhibited networked structures resembling extracellular vesicles.

Conclusions:

  • Fungal melanization involves the attachment of melanin nanoparticles to the cell wall.
  • Chitin, chitosan, and glucans are key components mediating melanin-cell wall interactions.
  • The study provides insights into melanin biosynthesis and cell-wall dynamics in fungi.