The NLR Protein NLRP6 Does Not Impact Gut Microbiota Composition.

Area of Science:

• Immunology
• Microbiology
• Gastroenterology

Background:

• NLRP6 (Nod-like receptor containing a pyrin domain 6) is expressed in the intestinal epithelium.
• Previous studies suggested NLRP6 protects against intestinal injury and colitis via microbiota regulation.
• Concerns existed that prior findings were confounded by non-littermate animal models.

Purpose of the Study:

• To investigate the role of NLRP6 in shaping the intestinal microbiota.
• To assess the influence of NLRP6 on dextran sulfate sodium (DSS)-induced colitis.
• To validate findings using littermate wild-type (WT) and Nlrp6 knockout (KO) mice.

Main Methods:

• Analysis of intestinal microbiota composition at three locations in co-caged and individually-caged WT and Nlrp6 KO littermates.
• Assessment of DSS-induced colitis sensitivity in WT and Nlrp6 KO littermates.
• Sex-specific analysis of microbiota and colitis response.

Main Results:

• NLRP6 did not significantly influence the intestinal microbiota at homeostasis.
• A sex-biased microbial community structure was observed, independent of NLRP6 status.
• WT and Nlrp6 KO littermates showed comparable DSS-induced colitis sensitivity, except for KO females who exhibited increased sensitivity.

Conclusions:

• NLRP6 plays a limited role in maintaining intestinal microbiota homeostasis.
• The protective effect of NLRP6 against colitis appears minimal and potentially sex-specific.
• Using littermate animals is crucial for accurate genotype-phenotype association studies in mice.