Encephalitozoon hellem Infection Promotes Monocytes Extravasation

Area of Science:

• Immunology
• Infectious Diseases
• Cell Biology

Background:

• Microsporidia are obligate intracellular fungal pathogens.
• Monocytes and macrophages are crucial for host immune responses.
• Microsporidian infections can disrupt monocyte function and trafficking.

Purpose of the Study:

• To investigate the impact of *Encephalitozoon hellem* infection on monocyte maturation and trafficking.
• To analyze monocyte and macrophage dynamics in a murine model of microsporidiosis.
• To understand pathogen-host interactions at the cellular level.

Main Methods:

• Utilized a murine model infected with *Encephalitozoon hellem*.
• Employed flow cytometry and qPCR analysis.
• Compared monocytes and macrophages from bone marrow, peripheral blood, and inflamed tissues.

Main Results:

• Promoted maturation of pro-inflammatory CD11b+Ly-6C+ monocytes in bone marrow.
• Reduced Ly-6C+ monocyte percentage in peripheral blood but increased presence in inflamed small intestine.
• Elevated F4/80 macrophage ratio in the small intestine of infected mice.

Conclusions:

• *E. hellem* infection enhances monocyte maturation and bone marrow release.
• Facilitates increased monocyte extravasation to inflammatory sites and subsequent macrophage differentiation.
• Provides novel insights into monocyte behavior during microsporidian infections.