Vitamin D and experimental invasive aspergillosis

Area of Science:

• Immunology
• Pharmacology
• Mycology

Background:

• Immune cells express vitamin D receptors and metabolizing enzymes.
• Vitamin D has shown potential benefits in tuberculosis and influences immune responses in aspergillosis.
• Vitamin D deficiency impacts T helper cell responses in conditions like cystic fibrosis-allergic bronchopulmonary aspergillosis.

Purpose of the Study:

• To investigate whether vitamin D (calcitriol) modulates the proinflammatory effects of amphotericin B (AmB) therapy in invasive aspergillosis.
• To assess the impact of calcitriol on survival and treatment efficacy when combined with amphotericin B deoxycholate (AmBd).

Main Methods:

• Mice were intravenously infected with Aspergillus fumigatus conidia.
• Mice received varying doses of calcitriol and/or AmBd via intraperitoneal or intravenous routes.
• Calcitriol and AmBd were administered multiple times to assess survival and residual infection over 10 days.

Main Results:

• Calcitriol alone did not significantly affect survival or residual infection in mice.
• Calcitriol did not alter the antifungal efficacy of AmBd.
• While AmBd alone improved survival, adding calcitriol did not further enhance this effect.

Conclusions:

• In disseminated invasive aspergillosis models, calcitriol did not influence the overall outcome.
• Calcitriol does not appear to modulate the efficacy of amphotericin B deoxycholate therapy in this context.