Bile acid: a potential inducer of colon cancer stem cells

Although the unconjugated secondary bile acids, specifically deoxycholic acid (DCA) and lithocholic acid (LCA), are considered to be risk factors for colorectal cancer, the precise mechanism(s) by which they regulate carcinogenesis is poorly understood. We hypothesize that the cytotoxic bile acids m...

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Veröffentlicht in:Stem cell research & therapy 2016-12, Vol.7 (1), p.181-181, Article 181
Hauptverfasser: Farhana, Lulu, Nangia-Makker, Pratima, Arbit, Evan, Shango, Kathren, Sarkar, Sarah, Mahmud, Hamidah, Hadden, Timothy, Yu, Yingjie, Majumdar, Adhip P N
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container_start_page 181
container_title Stem cell research & therapy
container_volume 7
creator Farhana, Lulu
Nangia-Makker, Pratima
Arbit, Evan
Shango, Kathren
Sarkar, Sarah
Mahmud, Hamidah
Hadden, Timothy
Yu, Yingjie
Majumdar, Adhip P N
description Although the unconjugated secondary bile acids, specifically deoxycholic acid (DCA) and lithocholic acid (LCA), are considered to be risk factors for colorectal cancer, the precise mechanism(s) by which they regulate carcinogenesis is poorly understood. We hypothesize that the cytotoxic bile acids may promote stemness in colonic epithelial cells leading to generation of cancer stem cells (CSCs) that play a role in the development and progression of colon cancer. Normal human colonic epithelial cells (HCoEpiC) were used to study bile acid DCA/LCA-mediated induction of CSCs. The expression of CSC markers was measured by real-time qPCR. Flow cytometry was used to isolate CSCs. T-cell factor/lymphoid-enhancing factor (TCF/LEF) luciferase assay was employed to examine the transcriptional activity of β-catenin. Downregulation of muscarinic 3 receptor (M3R) was achieved through transfection of corresponding siRNA. We found DCA/LCA to induce CSCs in normal human colonic epithelial cells, as evidenced by the increased proportion of CSCs, elevated levels of several CSC markers, as well as a number of epithelial-mesenchymal transition markers together with increased colonosphere formation, drug exclusion, ABCB1 and ABCG2 expression, and induction of M3R, p-EGFR, matrix metallopeptidases, and c-Myc. Inhibition of M3R signaling greatly suppressed DCA/LCA induction of the CSC marker ALDHA1 and also c-Myc mRNA expression as well as transcriptional activation of TCF/LEF. Our results suggest that bile acids, specifically DCA and LCA, induce cancer stemness in colonic epithelial cells by modulating M3R and Wnt/β-catenin signaling and thus could be considered promoters of colon cancer.
doi_str_mv 10.1186/s13287-016-0439-4
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We hypothesize that the cytotoxic bile acids may promote stemness in colonic epithelial cells leading to generation of cancer stem cells (CSCs) that play a role in the development and progression of colon cancer. Normal human colonic epithelial cells (HCoEpiC) were used to study bile acid DCA/LCA-mediated induction of CSCs. The expression of CSC markers was measured by real-time qPCR. Flow cytometry was used to isolate CSCs. T-cell factor/lymphoid-enhancing factor (TCF/LEF) luciferase assay was employed to examine the transcriptional activity of β-catenin. Downregulation of muscarinic 3 receptor (M3R) was achieved through transfection of corresponding siRNA. 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therapy</jtitle><addtitle>Stem Cell Res Ther</addtitle><date>2016-12-01</date><risdate>2016</risdate><volume>7</volume><issue>1</issue><spage>181</spage><epage>181</epage><pages>181-181</pages><artnum>181</artnum><issn>1757-6512</issn><eissn>1757-6512</eissn><abstract>Although the unconjugated secondary bile acids, specifically deoxycholic acid (DCA) and lithocholic acid (LCA), are considered to be risk factors for colorectal cancer, the precise mechanism(s) by which they regulate carcinogenesis is poorly understood. We hypothesize that the cytotoxic bile acids may promote stemness in colonic epithelial cells leading to generation of cancer stem cells (CSCs) that play a role in the development and progression of colon cancer. Normal human colonic epithelial cells (HCoEpiC) were used to study bile acid DCA/LCA-mediated induction of CSCs. The expression of CSC markers was measured by real-time qPCR. Flow cytometry was used to isolate CSCs. T-cell factor/lymphoid-enhancing factor (TCF/LEF) luciferase assay was employed to examine the transcriptional activity of β-catenin. Downregulation of muscarinic 3 receptor (M3R) was achieved through transfection of corresponding siRNA. We found DCA/LCA to induce CSCs in normal human colonic epithelial cells, as evidenced by the increased proportion of CSCs, elevated levels of several CSC markers, as well as a number of epithelial-mesenchymal transition markers together with increased colonosphere formation, drug exclusion, ABCB1 and ABCG2 expression, and induction of M3R, p-EGFR, matrix metallopeptidases, and c-Myc. Inhibition of M3R signaling greatly suppressed DCA/LCA induction of the CSC marker ALDHA1 and also c-Myc mRNA expression as well as transcriptional activation of TCF/LEF. Our results suggest that bile acids, specifically DCA and LCA, induce cancer stemness in colonic epithelial cells by modulating M3R and Wnt/β-catenin signaling and thus could be considered promoters of colon cancer.</abstract><cop>England</cop><pub>BioMed Central Ltd</pub><pmid>27908290</pmid><doi>10.1186/s13287-016-0439-4</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record>
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subjects Analysis
ATP Binding Cassette Transporter, Sub-Family B - genetics
ATP Binding Cassette Transporter, Sub-Family B - metabolism
ATP Binding Cassette Transporter, Sub-Family G, Member 2 - genetics
ATP Binding Cassette Transporter, Sub-Family G, Member 2 - metabolism
beta Catenin - genetics
beta Catenin - metabolism
Bile acids
Biomarkers, Tumor - genetics
Biomarkers, Tumor - metabolism
Cell Line
Cell Transformation, Neoplastic - drug effects
Cell Transformation, Neoplastic - genetics
Cell Transformation, Neoplastic - metabolism
Cell Transformation, Neoplastic - pathology
Colon - drug effects
Colon - metabolism
Colon - pathology
Colon cancer
Complications and side effects
Deoxycholic Acid - pharmacology
Development and progression
Epithelial Cells - drug effects
Epithelial Cells - metabolism
Epithelial Cells - pathology
Epithelial-Mesenchymal Transition - drug effects
Epithelial-Mesenchymal Transition - genetics
Gene Expression Regulation, Neoplastic
Genes, Reporter
Humans
Lithocholic Acid - pharmacology
Luciferases - genetics
Luciferases - metabolism
Neoplasm Proteins - genetics
Neoplasm Proteins - metabolism
Neoplastic Stem Cells - drug effects
Neoplastic Stem Cells - metabolism
Neoplastic Stem Cells - pathology
Proto-Oncogene Proteins c-myc - genetics
Proto-Oncogene Proteins c-myc - metabolism
Receptor, Epidermal Growth Factor - genetics
Receptor, Epidermal Growth Factor - metabolism
Receptor, Muscarinic M3 - antagonists & inhibitors
Receptor, Muscarinic M3 - genetics
Receptor, Muscarinic M3 - metabolism
Risk factors
RNA, Small Interfering - genetics
RNA, Small Interfering - metabolism
Signal Transduction
Stem cells
T Cell Transcription Factor 1 - genetics
T Cell Transcription Factor 1 - metabolism
title Bile acid: a potential inducer of colon cancer stem cells
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