title: Green tea polyphenol epigallocatechin 3-gallate, contributes to the degradation of DNMT3A and HDAC3 in HCT 116 human colon cancer cells.
abstract: BACKGROUND
  Colon cancer is still the second leading cause of cancer deaths in the United States. Epigenetic gene silencing involving DNA methyltransferases (DNMTs) and histone deacetylases (HDACs) plays an important role in the progression of colon cancer.
  
  
  METHODS
  In the present study we found that the sensitivity of colon cancer cells to methylation plays a role in its response to alternative therapy involving the green tea polyphenol, epigallocatechin 3-gallate. HDAC and DNMT protein expression were reduced when methylation-sensitive HCT 116 human colon cancer cells was treated with EGCG, but was relatively stable in the HT-29 cell line. This decrease in expression may be partially explained by our finding that DNMT3A and HDAC3 are degraded in the methylation-sensitive colon cancer cells in part by inhibiting their association with the E3 ubiquitin ligase, UHRF1.
  
  
  CONCLUSIONS
  These findings provide a rationale for the development of a targeted therapy for methylation-sensitive colon cancer that can include EGCG in combination with other DNMT and HDAC inhibitors.
authors: 86 Jonathan Lucas St. HCC 710, Charleston SC, U.S.A. vondinab@gmail.com.
authors: Vondina R
authors: VR
authors: Moseley
authors: Jay
authors: J
authors: Morris
authors: Rebecca W
authors: RW
authors: Knackstedt
authors: Michael J
authors: MJ
authors: Wargovich
mesh_terms: D001483:Base Sequence; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology; D003110:Colonic Neoplasms / Q000201:enzymology* / Q000473:pathology; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000235:genetics / Q000378:metabolism*; D000090205:DNA Methyltransferase 3A; D017931:DNA Primers; D045325:HCT116 Cells; D006655:Histone Deacetylases / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D059748:Proteolysis; D060888:Real-Time Polymerase Chain Reaction; D013662:Tea / Q000737:chemistry*; D000099186:Histone Deacetylase 3
chemical_list: D002392:Catechin; D004248:DNA (Cytosine-5-)-Methyltransferases; D000090205:DNA Methyltransferase 3A; D017931:DNA Primers; D006655:Histone Deacetylases; D013662:Tea; D000099186:Histone Deacetylase 3; C000717967:DNMT3A protein, human; C045651:epigallocatechin gallate
keywords: DNMT3A; EGCG; Epigenetics; HDAC3; colon cancer; epigallocatechin 3-gallate; green tea