Dancing cheek to cheek: Cryptococcus neoformans and phagocytes.

Area of Science:

• Immunology
• Infectious Diseases
• Mycology

Background:

• Meningoencephalitis caused by Cryptococcus neoformans (Cn) is a leading cause of mortality in individuals with Acquired Immunodeficiency Syndrome (AIDS).
• Understanding the complex interactions between Cn and host phagocytic cells is crucial for elucidating the pathogenesis of cryptococcal meningoencephalitis.

Purpose of the Study:

• To explore the intricate interactions between Cryptococcus neoformans and various phagocytic cells.
• To investigate the mechanisms by which Cn manipulates host cells for proliferation and dissemination.
• To understand the dual roles of phagocytes in the progression of cryptococcosis.

Main Methods:

• Review of existing literature on Cryptococcus neoformans-phagocyte interactions.
• Analysis of cellular mechanisms involved in Cn internalization, intracellular survival, and egress.
• Examination of immune molecules and microbial factors regulating these interactions.

Main Results:

• Cryptococcus neoformans can exist both extracellularly and intracellularly within various host cells, including monocytes, macrophages, neutrophils, dendritic cells, and endothelial cells.
• Internalized Cn can proliferate, cause host cell lysis, exit via non-lytic exocytosis, or be transported to the brain (Trojan horse mechanism).
• These processes are modulated by both microbial factors and host immune molecules.

Conclusions:

• Phagocytes exhibit both protective and detrimental roles in the context of cryptococcosis.
• Further investigation is warranted to fully elucidate the multifaceted interactions between phagocytes and Cn in the pathogenesis of meningoencephalitis.