TRPV1 controls innate immunity during Citrobacter rodentium enteric infection

Area of Science:

• Immunology
• Neuroscience
• Microbiology

Background:

• Mucosal immunity is vital for host defense against enteric pathogens.
• Neuronal communication significantly influences immune responses.
• Sensory neurons expressing Transient Receptor Potential Vanilloid Receptor 1 (TRPV1) are implicated in host-protective responses.

Purpose of the Study:

• To investigate the specific role of TRPV1 in coordinating host responses to the enteric pathogen Citrobacter rodentium.
• To assess the impact of TRPV1 deficiency on bacterial burden, host pathology, and immune cell recruitment.

Main Methods:

• Utilized a mouse model of Citrobacter rodentium infection.
• Compared TRPV1 knockout (TRPV1-/-) mice with wild-type (WT) littermates.
• Analyzed bacterial load, colonic histopathology, and immune cell populations (T cells, neutrophils) and expression of chemokines and adhesion molecules.

Main Results:

• TRPV1-/- mice exhibited significantly higher C. rodentium burden and increased colonic crypt hyperplasia.
• Neutrophil recruitment to the colon was significantly reduced in TRPV1-/- mice.
• Expression of the chemokine Cxcl6 and adhesion molecules Icam1 was decreased in TRPV1-/- mice, impacting endothelial cell adhesion molecules.

Conclusions:

• TRPV1 is critical for effective host-protective responses against enteric bacterial pathogens.
• TRPV1 signaling is essential for neutrophil recruitment and controlling pathogen load in the gut.
• These findings highlight the role of TRPV1 in regulating mucosal immune responses to infection.