Immunity to gastrointestinal nematode infections.

Area of Science:

• Immunology
• Parasitology
• Gastroenterology

Background:

• Gastrointestinal nematodes infect over a billion people globally, posing a significant challenge to host immunity due to continuous exposure and high prevalence.
• These large multicellular pathogens require complex host immune responses for control and resolution.

Purpose of the Study:

• To review current understanding of host-parasite interactions in gastrointestinal nematode infections.
• To detail the induction of protective immunity, resistance mechanisms, and response resolution.

Main Methods:

• The review synthesizes findings from laboratory model systems studying host-parasite interactions.
• Focuses on innate and adaptive type 2 cytokine responses.

Main Results:

• Host immune responses are dominated by type 2 cytokine pathways.
• These responses activate cellular and soluble effectors to disrupt the parasite's niche.
• Mechanisms include strengthening the mucosal barrier and promoting tissue repair.

Conclusions:

• Type 2 immune responses are crucial for controlling gastrointestinal nematodes.
• Effective immune strategies involve disrupting the parasite's habitat and facilitating host tissue repair.