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Background    Akkermansia muciniphila  and  Desulfovibrio  spp. are commensal microbes colonising the mucus gel layer of the colon. Both species have the capacity to utilise colonic mucin as a substrate.  A .  muciniphila  degrades colonic mucin, while  Desulfovibrio  spp. metabolise the sulfate moiety of sulfated mucins. Altered abundances of these microorganisms have been reported in ulcerative colitis (UC). However their capacity to bind to human colonic mucin, and whether this binding capacity is affected by changes in mucin associated with UC, remain to be defined.    Methods  Mucin was isolated from resected colon from control patients undergoing resection for colonic cancer (n = 7) and patients undergoing resection for UC (n = 5). Isolated mucin was purified and printed onto mucin microarrays. Binding of reference strains and three clinical isolates of  A .  muciniphila  and  Desulfovibrio  spp. to purified mucin was investigated.    Results  Both  A .  muciniphila  and  Desulfovibro  spp. bound to mucin. The reference strain and all clinical isolates of  A .  muciniphila  showed increased binding capacity for UC mucin (p < .005). The  Desulfovibrio  reference strain showed increased affinity for UC mucin. The mucin binding profiles of clinical isolates of  Desulfovibrio  spp. were specific to each isolate. Two isolates showed no difference in binding. One UC isolate bound with increased affinity to UC mucin (p < .005).    Conclusion  These preliminary data suggest that differences exist in the mucin binding capacity of isolates of  A .  muciniphila  and  Desulfovibrio  spp. This study highlights the mucin microarray platform as a means of studying the ability of bacteria to interact with colonic mucin in health and disease.

plos one

A Preliminary Study Examining the Binding Capacity of Akkermansia muciniphila and Desulfovibrio spp., to Colonic Mucin in Health and Ulcerative Colitis