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Crypt- and Mucosa-Associated Core Microbiotas in Humans and Their Alteration in Colon Cancer Patients. mBio 2019; 10:mBio.01315-19. [PMID: 31311881 PMCID: PMC6635529 DOI: 10.1128/mbio.01315-19] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Due to the huge number of bacteria constituting the human colon microbiota, alteration in the balance of its constitutive taxa (i.e., dysbiosis) is highly suspected of being involved in colorectal oncogenesis. Indeed, bacterial signatures in association with CRC have been described. These signatures may vary if bacteria are identified in feces or in association with tumor tissues. Here, we show that bacteria colonize human colonic crypts in tissues obtained from patients with CRC and with normal colonoscopy results. Aerobic nonfermentative Proteobacteria previously identified as constitutive of the crypt-specific core microbiota in murine colonic samples are similarly prevalent in human colonic crypts in combination with other anaerobic taxa. We also show that bacterial signatures characterizing the crypts of colonic tumors vary depending whether right-side or left-side tumors are analyzed. We have previously identified a crypt-specific core microbiota (CSCM) in the colons of healthy laboratory mice and related wild rodents. Here, we confirm that a CSCM also exists in the human colon and appears to be altered during colon cancer. The colonic microbiota is suggested to be involved in the development of colorectal cancer (CRC). Because the microbiota identified in fecal samples from CRC patients does not directly reflect the microbiota associated with tumor tissues themselves, we sought to characterize the bacterial communities from the crypts and associated adjacent mucosal surfaces of 58 patients (tumor and normal homologous tissue) and 9 controls with normal colonoscopy results. Here, we confirm that bacteria colonize human colonic crypts in both control and CRC tissues, and using laser-microdissected tissues and 16S rRNA gene sequencing, we further show that right and left crypt- and mucosa-associated bacterial communities are significantly different. In addition to Bacteroidetes and Firmicutes, and as with murine proximal colon crypts, environmental nonfermentative Proteobacteria are found in human colonic crypts. Fusobacterium and Bacteroides fragilis are more abundant in right-side tumors, whereas Parvimonas micra is more prevalent in left-side tumors. More precisely, Fusobacterium periodonticum is more abundant in crypts from cancerous samples in the right colon than in associated nontumoral samples from adjacent areas but not in left-side colonic samples. Future analysis of the interaction between these bacteria and the crypt epithelium, particularly intestinal stem cells, will allow deciphering of their possible oncogenic potential.
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Mailhe M, Ricaboni D, Vitton V, Gonzalez JM, Bachar D, Dubourg G, Cadoret F, Robert C, Delerce J, Levasseur A, Fournier PE, Angelakis E, Lagier JC, Raoult D. Repertoire of the gut microbiota from stomach to colon using culturomics and next-generation sequencing. BMC Microbiol 2018; 18:157. [PMID: 30355340 PMCID: PMC6201554 DOI: 10.1186/s12866-018-1304-7] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 10/04/2018] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Most studies on the human microbiota have analyzed stool samples, although a large proportion of the absorption of nutrients takes place in upper gut tract. We collected samples from different locations along the entire gastrointestinal tract from six patients who had simultaneously undergone upper endoscopy and colonoscopy, to perform a comprehensive analysis using culturomics with matrix assisted laser desorption ionisation - time of flight (MALDI-TOF) identification and by metagenomics targeting the 16S ribosomal ribonucleic acid (rRNA) gene. RESULTS Using culturomics, we isolated 368 different bacterial species, including 37 new species. Fewer species were isolated in the upper gut: 110 in the stomach and 106 in the duodenum, while 235 were isolated from the left colon (p < 0.02). We isolated fewer aero-intolerant species in the upper gut: 37 from the stomach and 150 from the left colon (p < 0.004). Using metagenomics, 1,021 species were identified. The upper gut microbiota was revealed to be less rich than the lower gut microbiota, with 37,622 reads from the stomach, 28,390 from the duodenum, and 79,047 from the left colon (p < 0.009). There were fewer reads for aero-intolerant species in the upper gut (8,656 in the stomach, 5,188 in the duodenum and 72,262 in the left colon, p < 0.02). Patients taking proton pump inhibitors (PPI) were then revealed to have a higher stomach pH and a greater diversity of species in the upper digestive tract than patients not receiving treatment (p < 0.001). CONCLUSION Significant modifications in bacterial composition and diversity exist throughout the gastrointestinal tract. We suggest that the upper gut may be key to understanding the relationship between the gut microbiota and health.
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Affiliation(s)
- Morgane Mailhe
- Aix Marseille Univ, IRD, MEPHI, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
| | - Davide Ricaboni
- Aix Marseille Univ, IRD, MEPHI, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
- Department of Clinical and Biomedical Sciences Luigi Sacco, III Division of Infectious Diseases, University of Milano, Via GB Grassi, 74, 20157 Milan, Italy
| | - Véronique Vitton
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, 13915 Marseille, France
| | - Jean-Michel Gonzalez
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, 13915 Marseille, France
| | - Dipankar Bachar
- Aix Marseille Univ, IRD, MEPHI, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
| | - Grégory Dubourg
- Aix Marseille Univ, IRD, MEPHI, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
| | - Frédéric Cadoret
- Aix Marseille Univ, IRD, MEPHI, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
| | - Catherine Robert
- Aix Marseille Univ, IRD, VITROME, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseillle, France
| | - Jérémy Delerce
- Aix Marseille Univ, IRD, MEPHI, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
| | - Anthony Levasseur
- Aix Marseille Univ, IRD, MEPHI, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
| | - Pierre-Edouard Fournier
- Aix Marseille Univ, IRD, VITROME, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseillle, France
| | - Emmanouil Angelakis
- Aix Marseille Univ, IRD, VITROME, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseillle, France
| | - Jean-Christophe Lagier
- Aix Marseille Univ, IRD, MEPHI, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
| | - Didier Raoult
- Aix Marseille Univ, IRD, MEPHI, IHU - Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
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