Th17 Lymphocytes in Children with Asthma: Do They Influence Control?

Area of Science:

• Immunology
• Pediatric Pulmonology
• Allergy and Clinical Immunology

Background:

• Asthma pathogenesis was historically attributed to T helper 2 (Th2) cells.
• The identification of T helper 17 (Th17) cells and their associated cytokines, such as interleukin-17 (IL-17), has expanded the understanding of immune responses in allergic diseases.
• The specific role of Th17 cells and IL-17 in pediatric asthma remains incompletely understood.

Purpose of the Study:

• To investigate the percentage of Th17 cells and IL-17A in pediatric asthma patients.
• To correlate Th17 cell and IL-17A levels with asthma control in children.
• To explore the potential involvement of non-Th2 inflammatory pathways in pediatric asthma.

Main Methods:

• A cross-sectional, prospective study involving 92 children aged 4-18 diagnosed with asthma.
• Asthma control was assessed using the validated Asthma Control Test, categorizing patients into controlled, partially controlled, and uncontrolled groups.
• Th17 cell percentages and IL-17A levels were quantified using flow cytometry.

Main Results:

• No significant differences in the mean percentage of Th17 cells were observed among the controlled, partially controlled, and uncontrolled asthma groups (P=0.71).
• Similarly, no significant differences in the mean percentage of IL-17A were found across the three asthma control categories (P=0.79).
• A significant correlation between Th17 cell or IL-17A levels and the degree of asthma control was not established.

Conclusions:

• The percentages of Th17 lymphocytes and IL-17A in children with asthma do not appear to significantly influence asthma control.
• These findings suggest that Th17-mediated inflammation might not be a primary driver of asthma control in the pediatric population studied.
• The research contributes to the understanding of non-Th2 inflammatory mechanisms in childhood asthma.