HDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver CancerSummary

Background & Aims: Epigenetic regulation of gene expression plays a critical role in the development of liver cancer; however, the molecular mechanisms of epigenetic-driven liver cancers are not well understood. The aims of this study were to examine molecular mechanisms that cause the dedif...

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Autores principales:	Maria Rivas, Michael E. Johnston, II, Ruhi Gulati, Meenasri Kumbaji, Talita Ferreira Margues Aguiar, Lubov Timchenko, Ana Krepischi, Soona Shin, Alexander Bondoc, Gregory Tiao, James Geller, Nikolai Timchenko
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Hepatoblastoma HDAC1 C/EBPα Sp5 Epigenetic Liver Cancer Diseases of the digestive system. Gastroenterology RC799-869
Acceso en línea:	https://doaj.org/article/a79ef3c66404472896ca72ae3a9c2d38
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spelling	oai:doaj.org-article:a79ef3c66404472896ca72ae3a9c2d382021-11-12T04:38:43ZHDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver CancerSummary2352-345X10.1016/j.jcmgh.2021.06.026https://doaj.org/article/a79ef3c66404472896ca72ae3a9c2d382021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352345X21001417https://doaj.org/toc/2352-345XBackground & Aims: Epigenetic regulation of gene expression plays a critical role in the development of liver cancer; however, the molecular mechanisms of epigenetic-driven liver cancers are not well understood. The aims of this study were to examine molecular mechanisms that cause the dedifferentiation of hepatocytes into cancer cells in aggressive hepatoblastoma and test if the inhibition of these mechanisms inhibits tumor growth. Methods: We have analyzed CCAAT/Enhancer Binding Protein alpha (C/EBPα), Transcription factor Sp5, and histone deacetylase (HDAC)1 pathways from a large biobank of fresh hepatoblastoma (HBL) samples using high-pressure liquid chromatography–based examination of protein–protein complexes and have examined chromatin remodeling on the promoters of markers of hepatocytes and p21. The HDAC1 activity was inhibited in patient-derived xenograft models of HBL and in cultured hepatoblastoma cells and expression of HDAC1-dependent markers of hepatocytes was examined. Results: Analyses of a biobank showed that a significant portion of HBL patients have increased levels of an oncogenic de-phosphorylated-S190-C/EBPα, Sp5, and HDAC1 compared with amounts of these proteins in adjacent regions. We found that the oncogenic de-phosphorylated-S190-C/EBPα is created in aggressive HBL by protein phosphatase 2A, which is increased within the nucleus and dephosphorylates C/EBPα at Ser190. C/EBPα–HDAC1 and Sp5–HDAC1 complexes are abundant in hepatocytes, which dedifferentiate into cancer cells. Studies in HBL cells have shown that C/EBPα–HDAC1 and Sp5–HDAC1 complexes reduce markers of hepatocytes and p21 via repression of their promoters. Pharmacologic inhibition of C/EBPα–HDAC1 and Sp5–HDAC1 complexes by Suberoylanilide hydroxamic acid (SAHA) and small interfering RNA–mediated inhibition of HDAC1 increase expression of hepatocyte markers, p21, and inhibit proliferation of cancer cells. Conclusions: HDAC1-mediated repression of markers of hepatocytes is an essential step for the development of HBL, providing background for generation of therapies for aggressive HBL by targeting HDAC1 activities.Maria RivasMichael E. Johnston, IIRuhi GulatiMeenasri KumbajiTalita Ferreira Margues AguiarLubov TimchenkoAna KrepischiSoona ShinAlexander BondocGregory TiaoJames GellerNikolai TimchenkoElsevierarticleHepatoblastomaHDAC1C/EBPαSp5EpigeneticLiver CancerDiseases of the digestive system. GastroenterologyRC799-869ENCellular and Molecular Gastroenterology and Hepatology, Vol 12, Iss 5, Pp 1669-1682 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Hepatoblastoma HDAC1 C/EBPα Sp5 Epigenetic Liver Cancer Diseases of the digestive system. Gastroenterology RC799-869
spellingShingle	Hepatoblastoma HDAC1 C/EBPα Sp5 Epigenetic Liver Cancer Diseases of the digestive system. Gastroenterology RC799-869 Maria Rivas Michael E. Johnston, II Ruhi Gulati Meenasri Kumbaji Talita Ferreira Margues Aguiar Lubov Timchenko Ana Krepischi Soona Shin Alexander Bondoc Gregory Tiao James Geller Nikolai Timchenko HDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver CancerSummary
description	Background & Aims: Epigenetic regulation of gene expression plays a critical role in the development of liver cancer; however, the molecular mechanisms of epigenetic-driven liver cancers are not well understood. The aims of this study were to examine molecular mechanisms that cause the dedifferentiation of hepatocytes into cancer cells in aggressive hepatoblastoma and test if the inhibition of these mechanisms inhibits tumor growth. Methods: We have analyzed CCAAT/Enhancer Binding Protein alpha (C/EBPα), Transcription factor Sp5, and histone deacetylase (HDAC)1 pathways from a large biobank of fresh hepatoblastoma (HBL) samples using high-pressure liquid chromatography–based examination of protein–protein complexes and have examined chromatin remodeling on the promoters of markers of hepatocytes and p21. The HDAC1 activity was inhibited in patient-derived xenograft models of HBL and in cultured hepatoblastoma cells and expression of HDAC1-dependent markers of hepatocytes was examined. Results: Analyses of a biobank showed that a significant portion of HBL patients have increased levels of an oncogenic de-phosphorylated-S190-C/EBPα, Sp5, and HDAC1 compared with amounts of these proteins in adjacent regions. We found that the oncogenic de-phosphorylated-S190-C/EBPα is created in aggressive HBL by protein phosphatase 2A, which is increased within the nucleus and dephosphorylates C/EBPα at Ser190. C/EBPα–HDAC1 and Sp5–HDAC1 complexes are abundant in hepatocytes, which dedifferentiate into cancer cells. Studies in HBL cells have shown that C/EBPα–HDAC1 and Sp5–HDAC1 complexes reduce markers of hepatocytes and p21 via repression of their promoters. Pharmacologic inhibition of C/EBPα–HDAC1 and Sp5–HDAC1 complexes by Suberoylanilide hydroxamic acid (SAHA) and small interfering RNA–mediated inhibition of HDAC1 increase expression of hepatocyte markers, p21, and inhibit proliferation of cancer cells. Conclusions: HDAC1-mediated repression of markers of hepatocytes is an essential step for the development of HBL, providing background for generation of therapies for aggressive HBL by targeting HDAC1 activities.
format	article
author	Maria Rivas Michael E. Johnston, II Ruhi Gulati Meenasri Kumbaji Talita Ferreira Margues Aguiar Lubov Timchenko Ana Krepischi Soona Shin Alexander Bondoc Gregory Tiao James Geller Nikolai Timchenko
author_facet	Maria Rivas Michael E. Johnston, II Ruhi Gulati Meenasri Kumbaji Talita Ferreira Margues Aguiar Lubov Timchenko Ana Krepischi Soona Shin Alexander Bondoc Gregory Tiao James Geller Nikolai Timchenko
author_sort	Maria Rivas
title	HDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver CancerSummary
title_short	HDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver CancerSummary
title_full	HDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver CancerSummary
title_fullStr	HDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver CancerSummary
title_full_unstemmed	HDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver CancerSummary
title_sort	hdac1-dependent repression of markers of hepatocytes and p21 is involved in development of pediatric liver cancersummary
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/a79ef3c66404472896ca72ae3a9c2d38
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HDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver CancerSummary

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