Research Papers:
Cancer-predicting transcriptomic and epigenetic signatures revealed for ulcerative colitis in patient-derived epithelial organoids
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Abstract
Samaneh K. Sarvestani1,*, Steven A. Signs1,*, Veronique Lefebvre2, Stephen Mack3, Ying Ni4, Andrew Morton1,5, Ernest R. Chan6, Xiaoxia Li7, Paul Fox2, Angela Ting4, Matthew F. Kalady1,8, Michael Cruise9, Jean Ashburn10, Jennifer Stiene1, Wei Lai1, David Liska1,8, Shao Xiang1 and Emina H. Huang1,8
1Department of Stem Cell Biology and Regenerative Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
2Department of Cell and Molecular Medicine, Cleveland Clinic, Cleveland, Ohio, USA
3Department of Pediatrics Baylor College of Medicine, Houston, Texas, USA
4Department of Genomic Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
5Department of Pathology, Case Western Reserve University, Cleveland, Ohio, USA
6Department of Epidemiology and Biostatistics, Institute for Computational Biology, Case Western Reserve University, Cleveland, Ohio, USA
7Department of Immunology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
8Department of Colorectal Surgery, Cleveland Clinic, Cleveland, Ohio, USA
9Department of Pathology, Cleveland Clinic, Cleveland, Ohio, USA
10Department of Surgery, Wake Forest School of Medicine, Salem, North Carolina, USA
*These authors have contributed equally to this work
Correspondence to:
Emina H. Huang, email: [email protected]
Keywords: ulcerative colitis; organoids; inflammation; H3K27Ac enhancer chromatin mark; colitis associated cancer
Received: December 09, 2017 Accepted: May 24, 2018 Published: June 19, 2018
ABSTRACT
Ulcerative colitis (UC) is a prevalent form of inflammatory bowel disease (IBD) whose pathogenic mechanisms remain unclear. Elucidating these mechanisms is important to reduce UC symptoms and to prevent UC progression into colitis-associated colon cancer (CAC). Our goal was to develop and validate faithful, human-derived, UC models and analyze them at histologic, transcriptomic and epigenetic levels to allow mechanistic studies of UC and CAC pathogenesis.
We generated patient-derived primary-organoid cultures from UC and non-IBD colonic epithelium. We phenotyped them histologically and used next-generation-sequencing approaches to profile whole transcriptomes and epigenomes of organoids and primary tissues.
Tissue organization and expression of mucin 2 (MUC2) and lysozyme (LYZ) demonstrated histologic faithfulness of organoids to healthy and diseased colonic epithelium. Transcriptomic analyses showed increased expression of inflammatory pathways in UC patient-derived organoids and tissues. Profiling for active enhancers using the H3K27ac histone modification revealed UC-derived organoid enrichment for pathways indicative of gastrointestinal cancer, including S100 calcium-binding protein P (S100P), and revealed novel markers for GI cancer, including both LYZ and neuropeptide S receptor 1 (NPSR1). Immunolocalization showed increased levels of LYZ, S100P, and NPSR1 proteins in UC and CAC.
In conclusion, primary colonic organoid cultures from UC and non-IBD patients can be established that faithfully represent diseased or normal colonic states. These models reveal precancerous molecular pathways that are already activated in UC. The findings demonstrate the suitability of primary organoids for dissecting UC and CAC pathogenic mechanisms and suggest new targets for therapeutic intervention.
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