Innate and Adaptive Immunity to Mucorales

Area of Science:

• Mycology
• Immunology
• Infectious Diseases

Background:

• Mucormycosis is an invasive fungal infection with high mortality rates.
• The infection is characterized by rapid fungal growth, angioinvasion, thrombosis, and tissue necrosis.
• Current therapeutics are limited, and the human immune system often fails to clear the infection.

Purpose of the Study:

• To investigate the interaction between the human immune system and Mucorales, the fungi causing mucormycosis.
• To understand how the developmental stage of fungal spores influences immune response.
• To identify reasons for immune system failure in clearing resting spores and inhibiting fungal growth.

Main Methods:

• The study reviews immune effector interactions with different developmental stages of Mucorales spores and hyphae.
• It examines the roles of phagocytes (macrophages, neutrophils), platelets, and dendritic cells in combating the infection.
• The impact of immune suppression on immune cell efficacy is considered.

Main Results:

• Resting spores are resistant to phagocytosis in healthy individuals.
• Swollen spores and hyphae are susceptible to macrophages and neutrophils.
• Platelets can suppress germination and damage hyphae, while dendritic cells activate adaptive immunity against hyphae.

Conclusions:

• Immune suppression significantly reduces the effectiveness of immune cells against Mucorales.
• Understanding the immune system's failure to clear resting spores and control fungal growth is crucial.
• Further knowledge is needed to enhance therapeutic strategies for mucormycosis.