Trichophyton tonsurans exocellular protease expression: correlation with clinical presentation in tinea capitis

Area of Science:

• Dermatology
• Mycology
• Biochemistry

Background:

• Tinea capitis is a common pediatric fungal infection with poorly understood pathogenesis.
• Trichophyton tonsurans is a primary cause of tinea capitis worldwide.

Purpose of the Study:

• To investigate the correlation between fungal protease expression in Trichophyton tonsurans and the clinical severity of tinea capitis in children.
• To explore potential inter-strain variability in protease activity among clinical isolates.

Main Methods:

• Children diagnosed with tinea capitis were enrolled, and clinical severity scores (CSS) were assigned.
• Fungal specimens were cultured, and protease activity (collagenase, elastase, keratinase) in culture supernatants was quantified.
• Enzyme activity was normalized to total soluble protein content.

Main Results:

• Significant inter-strain variability in collagenase, elastase, and keratinase activity was observed.
• Elastase and collagenase activity decreased with longer infection duration.
• Clinical severity scores increased with collagenase and elastase production in approximately half of the children.

Conclusions:

• Fungal protease expression, particularly collagenase and elastase, is linked to tinea capitis severity in a subset of pediatric patients.
• The findings suggest distinct host-pathogen interactions and potential patient stratification based on immune response to fungal antigens.
• Further research is needed to elucidate the mechanisms behind the varied clinical responses observed.