HDAC1-Dependent Repression of Markers of Hepatocytes and P21 Is Involved in Development of Pediatric Liver Cancer
| Autor: | Gregory Tiao, Talita Ferreira Margues Aguiar, Alexander Bondoc, Soona Shin, Maria Prates Rivas, Michael E. Johnston, Ruhi Gulati, Meenasri Kumbaji, Ana Cristina Victorino Krepischi, James I. Geller, Lubov Timchenko, Nikolai Timchenko |
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| Rok vydání: | 2021 |
| Předmět: |
Hepatoblastoma
SLC solute carrier HBL hepatoblastoma HDAC histone deacetylase RC799-869 MW molecular weight Epigenesis Genetic Enhancer binding PP2A protein phosphatase 2A Original Research OCT organic cation transporter Chemistry Liver Neoplasms Gastroenterology Epigenetic Cell Differentiation Diseases of the digestive system. Gastroenterology mRNA messenger RNA ChIP chromatin immunoprecipitation C/EBPα medicine.anatomical_structure Ola Olaparib Hepatocyte embryonic structures C/EBPα CCAAT/Enhancer Binding Protein alpha Liver cancer Liver Cancer animal structures cdk2/4 cyclin dependent kinases 2 and 4 Sp5 Chromatin remodeling medicine Humans PDX patient-derived xenograft Cell Proliferation Hepatology ALCD aggressive liver cancer domain Protein phosphatase 2 medicine.disease NRF2 Nuclear factor erythroid-2 HDAC1 qRT-PCR quantitative reverse-transcription polymerase chain reaction enzymes and coenzymes (carbohydrates) PARP Poly [ADP-ribose] polymerase Cancer cell Cancer research SEC size exclusion chromatography HNF Hepatocyte Nuclear Factor Histone deacetylase HCC hepatocellular carcinoma Co-IP co-immunoprecipitation |
| Zdroj: | Cellular and Molecular Gastroenterology and Hepatology Cellular and Molecular Gastroenterology and Hepatology, Vol 12, Iss 5, Pp 1669-1682 (2021) |
| ISSN: | 2352-345X |
| DOI: | 10.1016/j.jcmgh.2021.06.026 |
| Popis: | 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. Graphical abstract |
| Databáze: | OpenAIRE |
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