Nucleotide-binding oligomerization domain-containing protein 2 (Nod2) modulates T1DM susceptibility by gut microbiota

Publication date: Available online 4 June 2017
Source:Journal of Autoimmunity
Author(s): Yang-yang Li, James A. Pearson, Chen Chao, Jian Peng, Xiaojun Zhang, Zhiguang Zhou, Yu Liu, F. Susan Wong, Li Wen
Nucleotide-binding oligomerization domain-containing protein 2 (Nod2) is an innate immune receptor. To investigate the role of Nod2 in susceptibility to the autoimmune disease, type 1 diabetes mellitus (T1DM), we generated Nod2^−/− non-obese diabetic (NOD) mice. The Nod2^−/−NOD mice had different composition of the gut microbiota compared to Nod2^+/+NOD mice and were significantly protected from diabetes, but only when housed separately from Nod2^+/+NOD mice. This suggested that T1DM susceptibility in Nod2^−/−NOD mice is dependent on the alteration of gut microbiota, which modulated the frequency and function of IgA-secreting B-cells and IL-10 promoting T-regulatory cells. Finally, colonizing germ-free NOD mice with Nod2^−/−NOD gut microbiota significantly reduced pro-inflammatory cytokine-secreting immune cells but increased T-regulatory cells. Thus, gut microbiota modulate the immune system and T1D susceptibility. Importantly, our study raises a critical question about the housing mode in the interpretation of the disease phenotype of genetically-modified mouse strains in T1DM studies.



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