title: Overexpression of miR-126 sensitizes osteosarcoma cells to apoptosis induced by epigallocatechin-3-gallate.
abstract: BACKGROUND
  miR-126 plays an important role in the proliferation, invasion, migration, and chemotherapeutics resistance in cancer. Epigallocatechin-3-gallate (EGCG), as the major polyphenolic constituent present in green tea, is a promising anticancer agent. However, the role of miR-126 in EGCG anticancer remains unclear. Here, we investigated the effects of miR-126 and EGCG on cell viability, apoptosis, cell cycle distribution of osteosarcoma cells and the sensitization of miR-126 on osteosarcoma cells to EGCG.
  
  
  METHODS
  The cell viability, apoptosis and cycle distribution were analyzed using MTT assay and flow cytometry.
  
  
  RESULTS
  Our results showed that EGCG (0.025, 0.05, 0.1, 0.2 g/L) suppresses proliferation of osteosarcoma MG63 and U2OS cells in a concentration-dependent and time-dependent manner and the inhibitory effects of 0.05 g/L EGCG on U2OS cells were roughly equivalent to 20 μM cisplatin (DDP); miR-126 could promote apoptosis and inhibit proliferation in U2OS cells but without significant effects on cell cycle G1 phase arrest; EGCG suppressed proliferation of U2OS cells through induction of cell cycle G1 arrest and apoptotic death; overexpression of miR-126 enhanced the inhibitory effects of EGCG on proliferation in U2OS cells via promotion of apoptosis.
  
  
  CONCLUSIONS
  Our results demonstrate that enhanced expression of miR-126 increased the sensitivity of osteosarcoma cells to EGCG through induction of apoptosis.
authors.forename: Liangdong
authors.initials: L
authors.lastname: Jiang
authors.forename: Cheng
authors.initials: C
authors.lastname: Tao
authors.forename: Aiyong
authors.initials: A
authors.lastname: He
authors.affiliation: Children's Medical Center, The Second Xiangya Hospital, Central South University, No, 139 Middle Renmin Road, Changsha, Hunan 410011, P,R, China. hexj2014@126.com.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: He
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D001859:Bone Neoplasms / Q000188:drug therapy / Q000235:genetics / Q000473:pathology*; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology; D002453:Cell Cycle / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D005434:Flow Cytometry; D006801:Humans; D035683:MicroRNAs / Q000235:genetics*; D012516:Osteosarcoma / Q000188:drug therapy / Q000235:genetics / Q000473:pathology*; D014407:Tumor Cells, Cultured
chemical_list: C527111:MIRN126 microRNA, human; D035683:MicroRNAs; D002392:Catechin; C045651:epigallocatechin gallate