Inflammation induced by inoculation of the joint with Candida albicans

Area of Science:

• * Immunology
• * Mycology
• * Rheumatology

Background:

• * Candida albicans is a frequent opportunistic fungal pathogen in humans, especially in immunocompromised individuals.
• * Asymptomatic persistence and recurrent Candida infections suggest continuous circulation of fungal elements.
• * Joints can become sites for Candida infection, with reactivation more likely in patients with pre-existing arthritis.

Purpose of the Study:

• * To investigate joint inflammation induced by Candida albicans in healthy mice versus mice with collagen-induced arthritis (CIA).
• * To analyze the impact of localized Candida infection on established CIA.

Main Methods:

• * Intra-articular inoculation of live Candida albicans into the paws of intact mice and mice with CIA.
• * Assessment of joint swelling, polymorphonuclear (PMN) cell influx, and immune mediator secretion (TNF-alpha, IFN-gamma).
• * Measurement of anti-collagen antibodies in mice with CIA and concurrent Candida infection.

Main Results:

• * Candida albicans inoculation led to rapidly progressing septic arthritis in mouse joints.
• * Infection caused significant swelling, rapid PMN cell infiltration, and elevated TNF-alpha and IFN-gamma levels.
• * Joint Candida infection exacerbated established CIA, indicated by increased anti-collagen antibody levels.

Conclusions:

• * Localized Candida albicans infection rapidly induces severe septic arthritis.
• * Established CIA is worsened by concurrent joint Candida infection, suggesting immune system dysregulation.
• * Findings highlight the potential for Candida to cause destructive joint disease and complicate autoimmune conditions.