Characterization of an intelectin-1 (Itln1) knockout mouse model

Area of Science:

• Immunology
• Gastroenterology
• Metabolic Disease Research

Background:

• Intelectins are carbohydrate-binding proteins crucial for innate immunity, conserved across species.
• Human intelectin-1 (ITLN1) is abundant in the gut, binds microbial glycans, and is associated with Crohn's disease and obesity.
• Understanding ITLN1's in vivo function is vital for its role in human diseases.

Purpose of the Study:

• To investigate the in vivo biological activities of human intelectin-1 (ITLN1) using a genetically modified mouse model.
• To elucidate the role of ITLN1 in chemically induced colitis and diet-induced obesity.

Main Methods:

• Development of a C57BL/6 mouse model with targeted gene deletion for ITLN1.
• Analysis of ITLN1 expression in wild-type mice (small intestine, Paneth cells).
• Assessment of disease susceptibility in acute and chronic dextran sulfate sodium (DSS)-induced colitis models.
• Evaluation of weight gain, food intake, and plasma markers in diet-induced obesity models.

Main Results:

• Reduced ITLN1 expression (~10,000-fold) in homozygous hypomorphic mice.
• Increased susceptibility in acute DSS-induced colitis, but no significant differences in chronic colitis or diet-induced obesity models.
• ITLN1, expressed in Paneth cells, appears to play a minor role in these specific models of colitis and obesity.

Conclusions:

• The mouse genetic knockout model for ITLN1 is a valuable tool for studying mammalian intelectin function.
• ITLN1 likely plays a minor role in the pathophysiology of chemically induced colitis and diet-induced obesity in C57BL/6 mice.
• Further research is needed to fully understand the complex physiological roles of ITLN1 in mammalian systems.