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McDonough EM, Barrett CW, Parang B, Mittal MK, Smith JJ, Bradley AM, Choksi YA, Coburn LA, Short SP, Thompson JJ, Zhang B, Poindexter SV, Fischer MA, Chen X, Li J, Revetta FL, Naik R, Washington MK, Rosen MJ, Hiebert SW, Wilson KT, Williams CS. MTG16 is a tumor suppressor in colitis-associated carcinoma. JCI Insight 2017; 2:78210. [PMID: 28814670 DOI: 10.1172/jci.insight.78210] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 07/14/2017] [Indexed: 12/27/2022] Open
Abstract
MTG16 is a member of the myeloid translocation gene (MTG) family of transcriptional corepressors. While MTGs were originally identified in chromosomal translocations in acute myeloid leukemia, recent studies have uncovered a role in intestinal biology. For example, Mtg16-/- mice have increased intestinal proliferation and are more sensitive to intestinal injury in colitis models. MTG16 is also underexpressed in patients with moderate/severe ulcerative colitis. Based on these findings, we postulated that MTG16 might protect against colitis-associated carcinogenesis. MTG16 was downregulated at the protein and RNA levels in patients with inflammatory bowel disease and in those with colitis-associated carcinoma. Mtg16-/- mice subjected to inflammatory carcinogenesis modeling exhibited worse colitis and increased tumor multiplicity and size. Loss of MTG16 also increased severity of dysplasia, apoptosis, proliferation, DNA damage, and WNT signaling. Moreover, transplantation of WT marrow into Mtg16-/- mice failed to rescue the Mtg16-/- protumorigenic phenotypes, indicating an epithelium-specific role for MTG16. While MTG dysfunction is widely appreciated in hematopoietic malignancies, the role of this gene family in epithelial homeostasis, and in colon cancer, was unrealized. This report identifies MTG16 as an important modulator of colitis and tumor development in inflammatory carcinogenesis.
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Affiliation(s)
| | | | | | | | | | | | - Yash A Choksi
- Department of Medicine, Division of Gastroenterology
| | - Lori A Coburn
- Department of Medicine, Division of Gastroenterology.,Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee, USA
| | | | | | | | | | - Melissa A Fischer
- Department of Biochemistry, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Xi Chen
- Department of Public Health Sciences and the Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Jiang Li
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, California, USA
| | - Frank L Revetta
- Department of Pathology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Rishi Naik
- Department of Cancer Biology.,Department of Medicine, Division of Gastroenterology
| | - M Kay Washington
- Department of Pathology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Michael J Rosen
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Scott W Hiebert
- Department of Biochemistry, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Keith T Wilson
- Department of Cancer Biology.,Department of Medicine, Division of Gastroenterology.,Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee, USA.,Vanderbilt-Ingram Cancer Center, Nashville, Tennessee, USA
| | - Christopher S Williams
- Department of Cancer Biology.,Department of Medicine, Division of Gastroenterology.,Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee, USA.,Vanderbilt-Ingram Cancer Center, Nashville, Tennessee, USA
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Barrett CW, Reddy VK, Short SP, Motley AK, Lintel MK, Bradley AM, Freeman T, Vallance J, Ning W, Parang B, Poindexter SV, Fingleton B, Chen X, Washington MK, Wilson KT, Shroyer NF, Hill KE, Burk RF, Williams CS. Selenoprotein P influences colitis-induced tumorigenesis by mediating stemness and oxidative damage. J Clin Invest 2015; 125:2646-60. [PMID: 26053663 DOI: 10.1172/jci76099] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 04/30/2015] [Indexed: 12/19/2022] Open
Abstract
Patients with inflammatory bowel disease are at increased risk for colon cancer due to augmented oxidative stress. These patients also have compromised antioxidant defenses as the result of nutritional deficiencies. The micronutrient selenium is essential for selenoprotein production and is transported from the liver to target tissues via selenoprotein P (SEPP1). Target tissues also produce SEPP1, which is thought to possess an endogenous antioxidant function. Here, we have shown that mice with Sepp1 haploinsufficiency or mutations that disrupt either the selenium transport or the enzymatic domain of SEPP1 exhibit increased colitis-associated carcinogenesis as the result of increased genomic instability and promotion of a protumorigenic microenvironment. Reduced SEPP1 function markedly increased M2-polarized macrophages, indicating a role for SEPP1 in macrophage polarization and immune function. Furthermore, compared with partial loss, complete loss of SEPP1 substantially reduced tumor burden, in part due to increased apoptosis. Using intestinal organoid cultures, we found that, compared with those from WT animals, Sepp1-null cultures display increased stem cell characteristics that are coupled with increased ROS production, DNA damage, proliferation, decreased cell survival, and modulation of WNT signaling in response to H2O2-mediated oxidative stress. Together, these data demonstrate that SEPP1 influences inflammatory tumorigenesis by affecting genomic stability, the inflammatory microenvironment, and epithelial stem cell functions.
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Poindexter SV, Reddy VK, Mittal MK, Williams AM, Washington MK, Harris E, Mah A, Hiebert SW, Singh K, Chaturvedi R, Wilson KT, Lund PK, Williams CS. Transcriptional corepressor MTG16 regulates small intestinal crypt proliferation and crypt regeneration after radiation-induced injury. Am J Physiol Gastrointest Liver Physiol 2015; 308:G562-71. [PMID: 25573176 PMCID: PMC4360050 DOI: 10.1152/ajpgi.00253.2014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Myeloid translocation genes (MTGs) are transcriptional corepressors implicated in development, malignancy, differentiation, and stem cell function. While MTG16 loss renders mice sensitive to chemical colitis, the role of MTG16 in the small intestine is unknown. Histological examination revealed that Mtg16(-/-) mice have increased enterocyte proliferation and goblet cell deficiency. After exposure to radiation, Mtg16(-/-) mice exhibited increased crypt viability and decreased apoptosis compared with wild-type (WT) mice. Flow cytometric and immunofluorescence analysis of intestinal epithelial cells for phospho-histone H2A.X also indicated decreased DNA damage and apoptosis in Mtg16(-/-) intestines. To determine if Mtg16 deletion affected epithelial cells in a cell-autonomous fashion, intestinal crypts were isolated from Mtg16(-/-) mice. Mtg16(-/-) and WT intestinal crypts showed similar enterosphere forming efficiencies when cultured in the presence of EGF, Noggin, and R-spondin. However, when Mtg16(-/-) crypts were cultured in the presence of Wnt3a, they demonstrated higher enterosphere forming efficiencies and delayed progression to mature enteroids. Mtg16(-/-) intestinal crypts isolated from irradiated mice exhibited increased survival compared with WT intestinal crypts. Interestingly, Mtg16 expression was reduced in a stem cell-enriched population at the time of crypt regeneration. This is consistent with MTG16 negatively regulating regeneration in vivo. Taken together, our data demonstrate that MTG16 loss promotes radioresistance and impacts intestinal stem cell function, possibly due to shifting cellular response away from DNA damage-induced apoptosis and towards DNA repair after injury.
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Affiliation(s)
- Shenika V. Poindexter
- 1Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,7Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - Vishruth K. Reddy
- 1Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,7Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee; and ,8Medical Scientist Training Program, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Mukul K. Mittal
- 2Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,3Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee;
| | - Amanda M. Williams
- 1Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,7Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - M. Kay Washington
- 5Department of Pathology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,7Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - Elizabeth Harris
- 5Department of Pathology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,7Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - Amanda Mah
- 6Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, North Carolina;
| | - Scott W. Hiebert
- 4Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee; ,7Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - Kshipra Singh
- 2Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,3Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee;
| | - Rupesh Chaturvedi
- 1Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,2Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,3Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee; ,7Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - Keith T. Wilson
- 1Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,2Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,3Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee; ,7Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - P. Kay Lund
- 6Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, North Carolina;
| | - Christopher S. Williams
- 1Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,2Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee; ,3Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee; ,7Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee; and
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Barrett CW, Singh K, Motley AK, Lintel MK, Matafonova E, Bradley AM, Ning W, Poindexter SV, Parang B, Reddy VK, Chaturvedi R, Fingleton BM, Washington MK, Wilson KT, Davies SS, Hill KE, Burk RF, Williams CS. Dietary selenium deficiency exacerbates DSS-induced epithelial injury and AOM/DSS-induced tumorigenesis. PLoS One 2013; 8:e67845. [PMID: 23861820 PMCID: PMC3701622 DOI: 10.1371/journal.pone.0067845] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 05/21/2013] [Indexed: 12/13/2022] Open
Abstract
Selenium (Se) is an essential micronutrient that exerts its functions via selenoproteins. Little is known about the role of Se in inflammatory bowel disease (IBD). Epidemiological studies have inversely correlated nutritional Se status with IBD severity and colon cancer risk. Moreover, molecular studies have revealed that Se deficiency activates WNT signaling, a pathway essential to intestinal stem cell programs and pivotal to injury recovery processes in IBD that is also activated in inflammatory neoplastic transformation. In order to better understand the role of Se in epithelial injury and tumorigenesis resulting from inflammatory stimuli, we examined colonic phenotypes in Se-deficient or -sufficient mice in response to dextran sodium sulfate (DSS)-induced colitis, and azoxymethane (AOM) followed by cyclical administration of DSS, respectively. In response to DSS alone, Se-deficient mice demonstrated increased morbidity, weight loss, stool scores, and colonic injury with a concomitant increase in DNA damage and increases in inflammation-related cytokines. As there was an increase in DNA damage as well as expression of several EGF and TGF-β pathway genes in response to inflammatory injury, we sought to determine if tumorigenesis was altered in the setting of inflammatory carcinogenesis. Se-deficient mice subjected to AOM/DSS treatment to model colitis-associated cancer (CAC) had increased tumor number, though not size, as well as increased incidence of high grade dysplasia. This increase in tumor initiation was likely due to a general increase in colonic DNA damage, as increased 8-OHdG staining was seen in Se-deficient tumors and adjacent, non-tumor mucosa. Taken together, our results indicate that Se deficiency worsens experimental colitis and promotes tumor development and progression in inflammatory carcinogenesis.
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Affiliation(s)
- Caitlyn W. Barrett
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Kshipra Singh
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee, United States of America
| | - Amy K. Motley
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Mary K. Lintel
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Elena Matafonova
- Division of Clinical Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Amber M. Bradley
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Wei Ning
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Shenika V. Poindexter
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Bobak Parang
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Vishruth K. Reddy
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Rupesh Chaturvedi
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee, United States of America
| | - Barbara M. Fingleton
- Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Mary K. Washington
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Keith T. Wilson
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Vanderbilt Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee, United States of America
| | - Sean S. Davies
- Division of Clinical Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Kristina E. Hill
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Raymond F. Burk
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Christopher S. Williams
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Vanderbilt Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee, United States of America
- * E-mail:
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