MicroRNA (miR)-433 and miR-22 dysregulations induce histone-deacetylase-6 overexpression and ciliary loss in cholangiocarcinoma
© 2018 by the American Association for the Study of Liver Diseases..
Cholangiocytes normally express primary cilia, a multisensory organelle that detects signals from the cellular environment. Cilia are significantly reduced in cholangiocarcinoma (CCA) by a mechanism involving overexpression of histone deacetylase 6 (HDAC6). Despite HDAC6 overexpression in CCA, we found no differences in its mRNA level, suggesting a posttranscriptional regulation, possibly involving microRNAs (miRNAs). Here, we describe that at least two HDAC6-targeting miRNAs, miR-433 and miR-22, are down-regulated in CCA both in vitro and in vivo. Experimental restoration of these miRNAs in CCA cells reduced HDAC6 expression, induced ciliary restoration, and decreased the malignant phenotype. Furthermore, in contrast to the mature forms, levels of precursor forms of these miRNAs were higher in CCA compared to normal cholangiocytes and accumulated in the nuclei, suggesting a defective nuclear export. We assessed the expression of Exportin-5, the protein responsible for transporting miRNA precursors out of the nucleus, and found it to be reduced by 50% in CCA compared to normal cholangiocytes. Experimental overexpression of Exportin-5 in CCA cells restored precursor and mature forms of these miRNAs to normal levels, inducing a decrease in the expression of HDAC6 and a decrease in the malignant phenotype. Conversely, short hairpin RNA (shRNA) depletion of Exportin-5 in normal cholangiocytes resulted in increased nuclear retention of precursor miRNAs, decreased mature miRNAs, increased cell proliferation, and shorter cilia.
CONCLUSION: These data suggest that down-regulated Exportin-5 impairs the nuclear export of miR-433 and miR-22 precursor forms, causing a decrease in levels of mature miR-433 and miR-22 forms, and leading to overexpression of HDAC6 and ciliary loss in CCA. (Hepatology 2018).
| Errataetall: | |
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| Medienart: |
E-Artikel |
| Erscheinungsjahr: |
2018 |
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| Erschienen: |
2018 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:68 |
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| Enthalten in: |
Hepatology (Baltimore, Md.) - 68(2018), 2 vom: 06. Aug., Seite 561-573 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Mansini, Adrian P [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 31.01.2019 Date Revised 08.10.2019 published: Print-Electronic CommentIn: AME Med J. 2018 Oct;3:. - PMID 30506034 Citation Status MEDLINE |
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| doi: |
10.1002/hep.29832 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM280662653 |
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| 100 | 1 | |a Mansini, Adrian P |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a MicroRNA (miR)-433 and miR-22 dysregulations induce histone-deacetylase-6 overexpression and ciliary loss in cholangiocarcinoma |
| 264 | 1 | |c 2018 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
| 338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Date Completed 31.01.2019 | ||
| 500 | |a Date Revised 08.10.2019 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a CommentIn: AME Med J. 2018 Oct;3:. - PMID 30506034 | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2018 by the American Association for the Study of Liver Diseases. | ||
| 520 | |a Cholangiocytes normally express primary cilia, a multisensory organelle that detects signals from the cellular environment. Cilia are significantly reduced in cholangiocarcinoma (CCA) by a mechanism involving overexpression of histone deacetylase 6 (HDAC6). Despite HDAC6 overexpression in CCA, we found no differences in its mRNA level, suggesting a posttranscriptional regulation, possibly involving microRNAs (miRNAs). Here, we describe that at least two HDAC6-targeting miRNAs, miR-433 and miR-22, are down-regulated in CCA both in vitro and in vivo. Experimental restoration of these miRNAs in CCA cells reduced HDAC6 expression, induced ciliary restoration, and decreased the malignant phenotype. Furthermore, in contrast to the mature forms, levels of precursor forms of these miRNAs were higher in CCA compared to normal cholangiocytes and accumulated in the nuclei, suggesting a defective nuclear export. We assessed the expression of Exportin-5, the protein responsible for transporting miRNA precursors out of the nucleus, and found it to be reduced by 50% in CCA compared to normal cholangiocytes. Experimental overexpression of Exportin-5 in CCA cells restored precursor and mature forms of these miRNAs to normal levels, inducing a decrease in the expression of HDAC6 and a decrease in the malignant phenotype. Conversely, short hairpin RNA (shRNA) depletion of Exportin-5 in normal cholangiocytes resulted in increased nuclear retention of precursor miRNAs, decreased mature miRNAs, increased cell proliferation, and shorter cilia | ||
| 520 | |a CONCLUSION: These data suggest that down-regulated Exportin-5 impairs the nuclear export of miR-433 and miR-22 precursor forms, causing a decrease in levels of mature miR-433 and miR-22 forms, and leading to overexpression of HDAC6 and ciliary loss in CCA. (Hepatology 2018) | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, N.I.H., Extramural | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 7 | |a Karyopherins |2 NLM | |
| 650 | 7 | |a MIRN22 microRNA, human |2 NLM | |
| 650 | 7 | |a MIRN433 microRNA, human |2 NLM | |
| 650 | 7 | |a MicroRNAs |2 NLM | |
| 650 | 7 | |a XPO5 protein, human |2 NLM | |
| 650 | 7 | |a HDAC6 protein, human |2 NLM | |
| 650 | 7 | |a EC 3.5.1.98 |2 NLM | |
| 650 | 7 | |a Histone Deacetylase 6 |2 NLM | |
| 650 | 7 | |a EC 3.5.1.98 |2 NLM | |
| 700 | 1 | |a Lorenzo Pisarello, Maria J |e verfasserin |4 aut | |
| 700 | 1 | |a Thelen, Kristen M |e verfasserin |4 aut | |
| 700 | 1 | |a Cruz-Reyes, Maetzin |e verfasserin |4 aut | |
| 700 | 1 | |a Peixoto, Estanislao |e verfasserin |4 aut | |
| 700 | 1 | |a Jin, Sujeong |e verfasserin |4 aut | |
| 700 | 1 | |a Howard, Brynn N |e verfasserin |4 aut | |
| 700 | 1 | |a Trussoni, Christy E |e verfasserin |4 aut | |
| 700 | 1 | |a Gajdos, Gabriella B |e verfasserin |4 aut | |
| 700 | 1 | |a LaRusso, Nicholas F |e verfasserin |4 aut | |
| 700 | 1 | |a Perugorria, Maria J |e verfasserin |4 aut | |
| 700 | 1 | |a Banales, Jesus M |e verfasserin |4 aut | |
| 700 | 1 | |a Gradilone, Sergio A |e verfasserin |4 aut | |
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