Current concepts of hyperinflammation in chronic granulomatous disease

Area of Science:

• Immunology
• Genetics
• Molecular Biology

Background:

• Chronic granulomatous disease (CGD) is a primary immunodeficiency characterized by defective leukocyte nicotinamide dinucleotide phosphate (NADPH) oxidase.
• Phagocyte dysfunction in CGD leads to recurrent bacterial and fungal infections and significant autoinflammatory complications.
• While infections are manageable, autoinflammatory manifestations like granulomas and colitis are increasingly prominent in adult CGD patients.

Purpose of the Study:

• To elucidate the immunological mechanisms underlying hyperinflammation in CGD.
• To explore potential therapeutic strategies targeting these inflammatory pathways.

Main Methods:

• Review of recent immunological studies on CGD pathogenesis.
• Analysis of factors contributing to hyperinflammation, including neutrophil apoptosis, efferocytosis, immune receptors, T-cell redox, Th17 cells, IDO, Nrf2, and inflammasomes.

Main Results:

• CGD is associated with reduced neutrophil apoptosis and efferocytosis.
• Dysregulation of innate immune receptors, T-cell redox balance, and Th17 cell induction contribute to inflammation.
• Impaired Nrf2 activity, inflammasome activation, and the enzyme indolamine-2,3-dioxygenase (IDO) are implicated in CGD pathogenesis.

Conclusions:

• Hyperinflammation in CGD results from complex immunological dysregulation beyond the primary phagocyte defect.
• Targeting pathways like reduced neutrophil apoptosis, efferocytosis, and inflammasome activation may offer novel therapeutic approaches for CGD-associated autoinflammatory conditions.