MicroRNA down-regulated in human cholangiocarcinoma control cell cycle through multiple targets involved in the G1/S checkpoint

Alexandru V. Olaru, Gabriel Ghiaur, Sumitaka Yamanaka, Delgermaa Luvsanjav, Fangmei An, Irinel Popescu, Sorin Alexandrescu, Sarah Allen, Timothy M. Pawlik, Michael Torbenson, Christos Georgiades, Lewis Rowland Roberts, Gregory James Gores, Anne Ferguson-Smith, Maria I. Almeida, George A. Calin, Esteban Mezey, Florin M. Selaru

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Abstract

MicroRNAs (miRs) recently emerged as prominent regulators of cancer processes. In the current study we aimed at elucidating regulatory pathways and mechanisms through which miR-494, one of the miR species found to be down-regulated in cholangiocarcinoma (CCA), participates in cancer homeostasis. miR-494 was identified as down-regulated in CCA based on miR arrays. Its expression was verified with quantitative real-time reverse-transcription polymerase chain reaction (qRT-PCR). To enforce miR expression, we employed both transfection methods, as well as a retroviral construct to stably overexpress miR-494. Up-regulation of miR-494 in cancer cells decreased growth, consistent with a functional role. mRNA arrays of cells treated with miR-494, followed by pathway analysis, suggested that miR-494 impacts cell cycle regulation. Cell cycle analyses demonstrated that miR-494 induces a significant G1/S checkpoint reinforcement. Further analyses demonstrated that miR-494 down-regulates multiple molecules involved in this transition checkpoint. Luciferase reporter assays demonstrated a direct interaction between miR-494 and the 3'-untranslated region of cyclin-dependent kinase 6 (CDK6). Last, xenograft experiments demonstrated that miR-494 induces a significant cancer growth retardation in vivo. Conclusion: Our findings demonstrate that miR-494 is down-regulated in CCA and that its up-regulation induces cancer cell growth retardation through multiple targets involved in the G1-S transition. These findings support the paradigm that miRs are salient cellular signaling pathway modulators, and thus represent attractive therapeutic targets. miR-494 emerges as an important regulator of CCA growth and its further study may lead to the development of novel therapeutics. (HEPATOLOGY 2011)

Original languageEnglish (US)
Pages (from-to)2089-2098
Number of pages10
JournalHepatology
Volume54
Issue number6
DOIs
StatePublished - Dec 2011

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Cholangiocarcinoma
Cell Cycle Checkpoints
MicroRNAs
Neoplasms
Growth
Cell Cycle
Cyclin-Dependent Kinase 6
Up-Regulation
3' Untranslated Regions
Luciferases
Heterografts
Reverse Transcription
Transfection
Homeostasis
Down-Regulation
Polymerase Chain Reaction
Messenger RNA
Therapeutics

ASJC Scopus subject areas

  • Hepatology

Cite this

Olaru, A. V., Ghiaur, G., Yamanaka, S., Luvsanjav, D., An, F., Popescu, I., ... Selaru, F. M. (2011). MicroRNA down-regulated in human cholangiocarcinoma control cell cycle through multiple targets involved in the G1/S checkpoint. Hepatology, 54(6), 2089-2098. https://doi.org/10.1002/hep.24591

MicroRNA down-regulated in human cholangiocarcinoma control cell cycle through multiple targets involved in the G1/S checkpoint. / Olaru, Alexandru V.; Ghiaur, Gabriel; Yamanaka, Sumitaka; Luvsanjav, Delgermaa; An, Fangmei; Popescu, Irinel; Alexandrescu, Sorin; Allen, Sarah; Pawlik, Timothy M.; Torbenson, Michael; Georgiades, Christos; Roberts, Lewis Rowland; Gores, Gregory James; Ferguson-Smith, Anne; Almeida, Maria I.; Calin, George A.; Mezey, Esteban; Selaru, Florin M.

In: Hepatology, Vol. 54, No. 6, 12.2011, p. 2089-2098.

Research output: Contribution to journalArticle

Olaru, AV, Ghiaur, G, Yamanaka, S, Luvsanjav, D, An, F, Popescu, I, Alexandrescu, S, Allen, S, Pawlik, TM, Torbenson, M, Georgiades, C, Roberts, LR, Gores, GJ, Ferguson-Smith, A, Almeida, MI, Calin, GA, Mezey, E & Selaru, FM 2011, 'MicroRNA down-regulated in human cholangiocarcinoma control cell cycle through multiple targets involved in the G1/S checkpoint', Hepatology, vol. 54, no. 6, pp. 2089-2098. https://doi.org/10.1002/hep.24591
Olaru, Alexandru V. ; Ghiaur, Gabriel ; Yamanaka, Sumitaka ; Luvsanjav, Delgermaa ; An, Fangmei ; Popescu, Irinel ; Alexandrescu, Sorin ; Allen, Sarah ; Pawlik, Timothy M. ; Torbenson, Michael ; Georgiades, Christos ; Roberts, Lewis Rowland ; Gores, Gregory James ; Ferguson-Smith, Anne ; Almeida, Maria I. ; Calin, George A. ; Mezey, Esteban ; Selaru, Florin M. / MicroRNA down-regulated in human cholangiocarcinoma control cell cycle through multiple targets involved in the G1/S checkpoint. In: Hepatology. 2011 ; Vol. 54, No. 6. pp. 2089-2098.
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abstract = "MicroRNAs (miRs) recently emerged as prominent regulators of cancer processes. In the current study we aimed at elucidating regulatory pathways and mechanisms through which miR-494, one of the miR species found to be down-regulated in cholangiocarcinoma (CCA), participates in cancer homeostasis. miR-494 was identified as down-regulated in CCA based on miR arrays. Its expression was verified with quantitative real-time reverse-transcription polymerase chain reaction (qRT-PCR). To enforce miR expression, we employed both transfection methods, as well as a retroviral construct to stably overexpress miR-494. Up-regulation of miR-494 in cancer cells decreased growth, consistent with a functional role. mRNA arrays of cells treated with miR-494, followed by pathway analysis, suggested that miR-494 impacts cell cycle regulation. Cell cycle analyses demonstrated that miR-494 induces a significant G1/S checkpoint reinforcement. Further analyses demonstrated that miR-494 down-regulates multiple molecules involved in this transition checkpoint. Luciferase reporter assays demonstrated a direct interaction between miR-494 and the 3'-untranslated region of cyclin-dependent kinase 6 (CDK6). Last, xenograft experiments demonstrated that miR-494 induces a significant cancer growth retardation in vivo. Conclusion: Our findings demonstrate that miR-494 is down-regulated in CCA and that its up-regulation induces cancer cell growth retardation through multiple targets involved in the G1-S transition. These findings support the paradigm that miRs are salient cellular signaling pathway modulators, and thus represent attractive therapeutic targets. miR-494 emerges as an important regulator of CCA growth and its further study may lead to the development of novel therapeutics. (HEPATOLOGY 2011)",
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T1 - MicroRNA down-regulated in human cholangiocarcinoma control cell cycle through multiple targets involved in the G1/S checkpoint

AU - Olaru, Alexandru V.

AU - Ghiaur, Gabriel

AU - Yamanaka, Sumitaka

AU - Luvsanjav, Delgermaa

AU - An, Fangmei

AU - Popescu, Irinel

AU - Alexandrescu, Sorin

AU - Allen, Sarah

AU - Pawlik, Timothy M.

AU - Torbenson, Michael

AU - Georgiades, Christos

AU - Roberts, Lewis Rowland

AU - Gores, Gregory James

AU - Ferguson-Smith, Anne

AU - Almeida, Maria I.

AU - Calin, George A.

AU - Mezey, Esteban

AU - Selaru, Florin M.

PY - 2011/12

Y1 - 2011/12

N2 - MicroRNAs (miRs) recently emerged as prominent regulators of cancer processes. In the current study we aimed at elucidating regulatory pathways and mechanisms through which miR-494, one of the miR species found to be down-regulated in cholangiocarcinoma (CCA), participates in cancer homeostasis. miR-494 was identified as down-regulated in CCA based on miR arrays. Its expression was verified with quantitative real-time reverse-transcription polymerase chain reaction (qRT-PCR). To enforce miR expression, we employed both transfection methods, as well as a retroviral construct to stably overexpress miR-494. Up-regulation of miR-494 in cancer cells decreased growth, consistent with a functional role. mRNA arrays of cells treated with miR-494, followed by pathway analysis, suggested that miR-494 impacts cell cycle regulation. Cell cycle analyses demonstrated that miR-494 induces a significant G1/S checkpoint reinforcement. Further analyses demonstrated that miR-494 down-regulates multiple molecules involved in this transition checkpoint. Luciferase reporter assays demonstrated a direct interaction between miR-494 and the 3'-untranslated region of cyclin-dependent kinase 6 (CDK6). Last, xenograft experiments demonstrated that miR-494 induces a significant cancer growth retardation in vivo. Conclusion: Our findings demonstrate that miR-494 is down-regulated in CCA and that its up-regulation induces cancer cell growth retardation through multiple targets involved in the G1-S transition. These findings support the paradigm that miRs are salient cellular signaling pathway modulators, and thus represent attractive therapeutic targets. miR-494 emerges as an important regulator of CCA growth and its further study may lead to the development of novel therapeutics. (HEPATOLOGY 2011)

AB - MicroRNAs (miRs) recently emerged as prominent regulators of cancer processes. In the current study we aimed at elucidating regulatory pathways and mechanisms through which miR-494, one of the miR species found to be down-regulated in cholangiocarcinoma (CCA), participates in cancer homeostasis. miR-494 was identified as down-regulated in CCA based on miR arrays. Its expression was verified with quantitative real-time reverse-transcription polymerase chain reaction (qRT-PCR). To enforce miR expression, we employed both transfection methods, as well as a retroviral construct to stably overexpress miR-494. Up-regulation of miR-494 in cancer cells decreased growth, consistent with a functional role. mRNA arrays of cells treated with miR-494, followed by pathway analysis, suggested that miR-494 impacts cell cycle regulation. Cell cycle analyses demonstrated that miR-494 induces a significant G1/S checkpoint reinforcement. Further analyses demonstrated that miR-494 down-regulates multiple molecules involved in this transition checkpoint. Luciferase reporter assays demonstrated a direct interaction between miR-494 and the 3'-untranslated region of cyclin-dependent kinase 6 (CDK6). Last, xenograft experiments demonstrated that miR-494 induces a significant cancer growth retardation in vivo. Conclusion: Our findings demonstrate that miR-494 is down-regulated in CCA and that its up-regulation induces cancer cell growth retardation through multiple targets involved in the G1-S transition. These findings support the paradigm that miRs are salient cellular signaling pathway modulators, and thus represent attractive therapeutic targets. miR-494 emerges as an important regulator of CCA growth and its further study may lead to the development of novel therapeutics. (HEPATOLOGY 2011)

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