Abstract:
OBJECTIVE:Colorectal cancer (CRC) incidence is higher in African Americans (AAs) compared with non-Hispanic whites (NHWs). A diet high in animal protein and fat is an environmental risk factor for CRC development. The intestinal microbiota is postulated to modulate the effects of diet in promoting or preventing CRC. Hydrogen sulfide, produced by autochthonous sulfidogenic bacteria, triggers proinflammatory pathways and hyperproliferation, and is genotoxic. We hypothesised that sulfidogenic bacterial abundance in colonic mucosa may be an environmental CRC risk factor that distinguishes AA and NHW. DESIGN:Colonic biopsies from uninvolved or healthy mucosa from CRC cases and tumour-free controls were collected prospectively from five medical centres in Chicago for association studies. Sulfidogenic bacterial abundance in uninvolved colonic mucosa of AA and NHW CRC cases was compared with normal mucosa of AA and NHW controls. In addition, 16S rDNA sequencing was performed in AA cases and controls. Correlations were examined among bacterial targets, race, disease status and dietary intake. RESULTS:AAs harboured a greater abundance of sulfidogenic bacteria compared with NHWs regardless of disease status. Bilophila wadsworthia-specific dsrA was more abundant in AA cases than controls. Linear discriminant analysis of 16S rRNA gene sequences revealed five sulfidogenic genera that were more abundant in AA cases. Fat and protein intake and daily servings of meat were significantly higher in AAs compared with NHWs, and multiple dietary components correlated with a higher abundance of sulfidogenic bacteria. CONCLUSIONS:These results implicate sulfidogenic bacteria as a potential environmental risk factor contributing to CRC development in AAs.
journal_name
Gutjournal_title
Gutauthors
Yazici C,Wolf PG,Kim H,Cross TL,Vermillion K,Carroll T,Augustus GJ,Mutlu E,Tussing-Humphreys L,Braunschweig C,Xicola RM,Jung B,Llor X,Ellis NA,Gaskins HRdoi
10.1136/gutjnl-2016-313321subject
Has Abstractpub_date
2017-11-01 00:00:00pages
1983-1994issue
11eissn
0017-5749issn
1468-3288pii
gutjnl-2016-313321journal_volume
66pub_type
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