The central adaptor molecule TRIF influences L. sigmodontis worm development

Area of Science:

• Immunology
• Parasitology
• Molecular Biology

Background:

• Lymphatic filariasis (LF) affects millions globally, causing elephantiasis and hydrocele.
• Filarial infections induce immune regulation, involving type 2 helper T cells and regulatory responses.
• Toll-like receptor (TLR) signaling is implicated, but the role of adapter molecule TRIF in vivo is unclear.

Purpose of the Study:

• Investigate the role of TRIF in TLR signaling during nematode infection.
• Analyze the impact of TRIF deficiency on immune responses to Litomosoides sigmodontis infection in mice.

Main Methods:

• Utilized a rodent model of filarial infection (Litomosoides sigmodontis) in C57BL/6 mice.
• Compared wildtype mice with TRIF-deficient (TRIF-/-) mice.
• Assessed worm burden and immune cell populations in the thoracic cavity 30 days post-infection.

Main Results:

• TRIF deficiency resulted in higher worm burden.
• Absence of TRIF led to reduced total immune cell numbers in the thoracic cavity.
• TRIF-/- mice showed increased macrophages and lymphocytes, but decreased eosinophils, CD4+, and CD8+ T cells.

Conclusions:

• TRIF is crucial for controlling worm recovery during L. sigmodontis infection.
• TRIF influences immune cell recruitment to the site of infection.
• TRIF deficiency impacts specific immune cell populations without altering overall cytokine levels or regulatory T cells at 30 days.