Mitochondria and Tumor Progression in Ulcerative Colitis

The role of mitochondria in cancer is poorly understood. Ulcerative colitis (UC) is an inflammatory bowel disease that predisposes to colorectal cancer and is an excellent model to study tumor progression. Our goal was to characterize mitochondrial alterations in UC tumorigenesis. Nondysplastic colo...

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Veröffentlicht in:JNCI : Journal of the National Cancer Institute 2013-08, Vol.105 (16), p.1239-1248
Hauptverfasser: CIGDEM HIMMETOGLU USSAKLI, EBAEE, Anoosheh, BINKLEY, Jennifer, BRENTNALL, Teresa A, EMOND, Mary J, RABINOVITCH, Peter S, RISQUES, Rosa Ana
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container_issue 16
container_start_page 1239
container_title JNCI : Journal of the National Cancer Institute
container_volume 105
creator CIGDEM HIMMETOGLU USSAKLI
EBAEE, Anoosheh
BINKLEY, Jennifer
BRENTNALL, Teresa A
EMOND, Mary J
RABINOVITCH, Peter S
RISQUES, Rosa Ana
description The role of mitochondria in cancer is poorly understood. Ulcerative colitis (UC) is an inflammatory bowel disease that predisposes to colorectal cancer and is an excellent model to study tumor progression. Our goal was to characterize mitochondrial alterations in UC tumorigenesis. Nondysplastic colon biopsies from UC patients with high-grade dysplasia or cancer (progressors; n = 9) and UC patients dysplasia free (nonprogressors; n = 9) were immunostained for cytochrome C oxidase (COX), a component of the electron transport chain, and were quantified by multispectral imaging. For six additional progressors, nondysplastic and dysplastic biopsies were stained for COX and additional mitochondrial proteins including PGC1α, the master regulator of mitochondrial biogenesis. Mitochondrial DNA (mtDNA) copy number was determined by quantitative polymerase chain reaction. Generalized estimating equations with two-sided tests were used to account for correlation of measurements within individuals. Nondysplastic biopsies of UC progressors showed statistically significant COX loss compared with UC nonprogressors by generalized estimating equation (-18.5 units, 95% confidence interval = -12.1 to -24.9; P < .001). COX intensity progressively decreased with proximity to dysplasia and was the lowest in adjacent to dysplasia and dysplastic epithelium. Surprisingly, COX intensity was statistically significantly increased in cancers. This bimodal pattern was observed for other mitochondrial proteins, including PGC1α, and was confirmed by mtDNA copy number. Mitochondrial loss precedes the development of dysplasia, and it could be used to detect and potentially predict cancer. Cancer cells restore mitochondria, suggesting that mitochondria are needed for further proliferation. This bimodal pattern might be driven by transcriptional regulation of mitochondrial biogenesis by PGC1α.
doi_str_mv 10.1093/jnci/djt167
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Ulcerative colitis (UC) is an inflammatory bowel disease that predisposes to colorectal cancer and is an excellent model to study tumor progression. Our goal was to characterize mitochondrial alterations in UC tumorigenesis. Nondysplastic colon biopsies from UC patients with high-grade dysplasia or cancer (progressors; n = 9) and UC patients dysplasia free (nonprogressors; n = 9) were immunostained for cytochrome C oxidase (COX), a component of the electron transport chain, and were quantified by multispectral imaging. For six additional progressors, nondysplastic and dysplastic biopsies were stained for COX and additional mitochondrial proteins including PGC1α, the master regulator of mitochondrial biogenesis. Mitochondrial DNA (mtDNA) copy number was determined by quantitative polymerase chain reaction. Generalized estimating equations with two-sided tests were used to account for correlation of measurements within individuals. Nondysplastic biopsies of UC progressors showed statistically significant COX loss compared with UC nonprogressors by generalized estimating equation (-18.5 units, 95% confidence interval = -12.1 to -24.9; P &lt; .001). COX intensity progressively decreased with proximity to dysplasia and was the lowest in adjacent to dysplasia and dysplastic epithelium. Surprisingly, COX intensity was statistically significantly increased in cancers. This bimodal pattern was observed for other mitochondrial proteins, including PGC1α, and was confirmed by mtDNA copy number. Mitochondrial loss precedes the development of dysplasia, and it could be used to detect and potentially predict cancer. Cancer cells restore mitochondria, suggesting that mitochondria are needed for further proliferation. 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Abdomen ; Glycolysis ; Humans ; Immunohistochemistry ; In Situ Hybridization, Fluorescence ; Inflammatory bowel disease ; Male ; Medical sciences ; Middle Aged ; Mitochondria ; Mitochondria - genetics ; Mitochondria - metabolism ; Mitochondria - ultrastructure ; Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha ; Polymerase Chain Reaction - methods ; Precancerous Conditions - metabolism ; Precancerous Conditions - pathology ; Stomach. Duodenum. Small intestine. Colon. Rectum. Anus ; Telomere Shortening ; Transcription Factors - metabolism ; Tumors</subject><ispartof>JNCI : Journal of the National Cancer Institute, 2013-08, Vol.105 (16), p.1239-1248</ispartof><rights>2014 INIST-CNRS</rights><rights>Copyright Oxford Publishing Limited(England) Aug 21, 2013</rights><rights>The Author 2013. Published by Oxford University Press. All rights reserved. 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Ulcerative colitis (UC) is an inflammatory bowel disease that predisposes to colorectal cancer and is an excellent model to study tumor progression. Our goal was to characterize mitochondrial alterations in UC tumorigenesis. Nondysplastic colon biopsies from UC patients with high-grade dysplasia or cancer (progressors; n = 9) and UC patients dysplasia free (nonprogressors; n = 9) were immunostained for cytochrome C oxidase (COX), a component of the electron transport chain, and were quantified by multispectral imaging. For six additional progressors, nondysplastic and dysplastic biopsies were stained for COX and additional mitochondrial proteins including PGC1α, the master regulator of mitochondrial biogenesis. Mitochondrial DNA (mtDNA) copy number was determined by quantitative polymerase chain reaction. Generalized estimating equations with two-sided tests were used to account for correlation of measurements within individuals. Nondysplastic biopsies of UC progressors showed statistically significant COX loss compared with UC nonprogressors by generalized estimating equation (-18.5 units, 95% confidence interval = -12.1 to -24.9; P &lt; .001). COX intensity progressively decreased with proximity to dysplasia and was the lowest in adjacent to dysplasia and dysplastic epithelium. Surprisingly, COX intensity was statistically significantly increased in cancers. This bimodal pattern was observed for other mitochondrial proteins, including PGC1α, and was confirmed by mtDNA copy number. Mitochondrial loss precedes the development of dysplasia, and it could be used to detect and potentially predict cancer. Cancer cells restore mitochondria, suggesting that mitochondria are needed for further proliferation. 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Pancreas. Abdomen</subject><subject>Glycolysis</subject><subject>Humans</subject><subject>Immunohistochemistry</subject><subject>In Situ Hybridization, Fluorescence</subject><subject>Inflammatory bowel disease</subject><subject>Male</subject><subject>Medical sciences</subject><subject>Middle Aged</subject><subject>Mitochondria</subject><subject>Mitochondria - genetics</subject><subject>Mitochondria - metabolism</subject><subject>Mitochondria - ultrastructure</subject><subject>Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha</subject><subject>Polymerase Chain Reaction - methods</subject><subject>Precancerous Conditions - metabolism</subject><subject>Precancerous Conditions - pathology</subject><subject>Stomach. Duodenum. Small intestine. Colon. Rectum. 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Nondysplastic biopsies of UC progressors showed statistically significant COX loss compared with UC nonprogressors by generalized estimating equation (-18.5 units, 95% confidence interval = -12.1 to -24.9; P &lt; .001). COX intensity progressively decreased with proximity to dysplasia and was the lowest in adjacent to dysplasia and dysplastic epithelium. Surprisingly, COX intensity was statistically significantly increased in cancers. This bimodal pattern was observed for other mitochondrial proteins, including PGC1α, and was confirmed by mtDNA copy number. Mitochondrial loss precedes the development of dysplasia, and it could be used to detect and potentially predict cancer. Cancer cells restore mitochondria, suggesting that mitochondria are needed for further proliferation. 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subjects Adult
Aged
Biological and medical sciences
Biosynthesis
Cancer
Case-Control Studies
Cell Transformation, Neoplastic - metabolism
Cell Transformation, Neoplastic - pathology
Colitis, Ulcerative - genetics
Colitis, Ulcerative - metabolism
Colitis, Ulcerative - pathology
Colorectal Neoplasms - genetics
Colorectal Neoplasms - metabolism
Colorectal Neoplasms - pathology
Disease Progression
DNA Copy Number Variations
Electron Transport Complex IV - genetics
Electron Transport Complex IV - metabolism
Female
Gastroenterology. Liver. Pancreas. Abdomen
Glycolysis
Humans
Immunohistochemistry
In Situ Hybridization, Fluorescence
Inflammatory bowel disease
Male
Medical sciences
Middle Aged
Mitochondria
Mitochondria - genetics
Mitochondria - metabolism
Mitochondria - ultrastructure
Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha
Polymerase Chain Reaction - methods
Precancerous Conditions - metabolism
Precancerous Conditions - pathology
Stomach. Duodenum. Small intestine. Colon. Rectum. Anus
Telomere Shortening
Transcription Factors - metabolism
Tumors
title Mitochondria and Tumor Progression in Ulcerative Colitis
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