Bacteria-induced colitis in naked mole rats is alleviated by probiotic treatment: a new mammalian model for acute inflammatory disease
Enteropathogenic bacteria are a major cause of morbidity and mortality globally. Mouse models have been indispensable in advancing our understanding of infectious diseases caused by intestinal pathogens and in identifying physical, chemical and immunological barriers that limit these infections. However, there are significant differences between laboratory mice and human intestinal microbiota and immunobiology that underscore the need to develop other models that recapitulate the disease pathology and mucosal immune responses of human enteric diseases. Here we report how the pathogenic expansion of Citrobacter braakii in naked mole rats (NMRs) leads to colonic inflammation and epithelial injury that mimics pathological features of human hemorrhagic colitis. We observe mucosal erosions, ulcerations, depletion of goblet cells, extension of proliferative compartments to the surface of the glands, and active inflammation in the colonic lamina propria of infected NMRs. Without intervention, systemic inflammation associated with sepsis ensues in infected NMRs and results in high mortality. Interestingly, we demonstrate a strong therapeutic effect of probiotics comprising Lactobacillus, Bifidobacterium, Streptococcus salvarius subsp. thermophilus and Enterococcus faecium strains. Treatment with probiotics induces mucosal healing and restores intestinal homeostasis, including suppression of excessive proliferation of epithelial cells, replenishment of goblet cells and also has an anti-inflammatory effect. Taken together, we demonstrate that NMRs, beyond their use as an anti-ageing and disease-resistance model, can also be used to address disease mechanisms underlying infectious colitis, including disruptions in the mucosal barrier permeability, gut microbial ecology and in local and systemic immune regulation; and in testing functional probiotics strains as potential therapeutics.