Poster (Scientific congresses, symposiums and conference proceedings)
From meta-genomics to causality: Understanding the role of colon cancer-associated bacteria in colorectal cancer
Ternes, Dominik; Wilmes, Paul; Letellier, Elisabeth et al.
2017Keystone symposia: Microbiome in Health and Disease (J8)
 

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Keywords :
Microbiome; Colorectal Cancer
Abstract :
[en] The human gastrointestinal tract is home for trillions of bacteria that influence homeostasis and health in a complex biological system: the gut microbiome. Accumulating evidence suggests that a state of pathological imbalance in the microbiome (dysbiosis) is present in patients suffering from colorectal cancer (CRC). To date, microbiome studies identified specific bacteria being associated with dysbiosis in CRC. Some of these bacteria (e.g. Fusobacteria) directly or indirectly interact with cancer and immune cells of their host. However, current studies only focused on certain microbes in detail, hence, their role in the etiology of the disease remains elusive. Accordingly, my project investigates the role of CRC-associated bacteria in tumor initiation and progression while addressing the question: which and what kind of microbes interact with, favor, or can cause CRC? In a first step, we identified CRC-associated bacteria, enriched at the tumor site of Luxembourgish CRC patients. By using Fusobacterium nucleatum as our study model, we predicted and optimized bacterial growth (media) in silico by using a genome-scale metabolic reconstruction model for a constraint-based modelling approach. Next, we assessed bacterial growth and metabolism in the optimized growth medium by using flow cytometry and mass spectrometry. Finally, we co-cultured the bacteria together with primary patient-derived cultures in the recently developed, microfluidics-based, human-microbial cross-talk model (HuMiX) [1]. As part of our ongoing validations, we infected patient-derived, healthy and cancerous 3D colonic organoids with our bacterial candidate. This workflow enables us to analyze pro-tumorigenic capacities of CRC-associated bacteria on healthy and cancerous colonocytes. It will serve as a promising tool for future analysis of host-microbial interaction mechanisms of various CRC-associated bacteria on a transcriptomic, proteomic, and metabolomic level. [1] Shah P, Fritz JV, Glaab E, Desai MS, Greenhalgh K et al. (2016) A microfluidics-based in vitro model of the gastrointestinal human-microbe interface. Nature communications 7: 11535.
Research center :
Life Science Research Unit (LSRU): Molecular Disease Mechanisms (Haan Group)
Luxembourg Centre for Systems Biomedicine (LCSB)
Disciplines :
Microbiology
Author, co-author :
Ternes, Dominik ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Life Science Research Unit
Wilmes, Paul ;  University of Luxembourg > Luxembourg Centre for Systems Biomedicine (LCSB)
Letellier, Elisabeth ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Life Science Research Unit
Haan, Serge ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Life Science Research Unit
External co-authors :
no
Language :
English
Title :
From meta-genomics to causality: Understanding the role of colon cancer-associated bacteria in colorectal cancer
Publication date :
05 February 2017
Number of pages :
A0
Event name :
Keystone symposia: Microbiome in Health and Disease (J8)
Event organizer :
Julie A. Segre, Ramnik Xavier and William Michael Dunne
Event place :
Keystone, Colorado, United States
Event date :
February 5—9, 2017
Audience :
International
Focus Area :
Systems Biomedicine
Name of the research project :
MiDiCa
Funders :
University of Luxembourg - UL
Available on ORBilu :
since 07 January 2019

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