title: Efficacies of beta-L-D4A against Hepatitis B virus in 2.2.15 cells.
abstract: OBJECTIVE
  To investigate the antiviral effect of beta-L-enantiomer of 2',3'-didehydro-2',3'-dideoxyadenosine (beta-L-D4A) on 2.2.15 cells transfected with the hepatitis B virus (HBV) genome.
  
  
  METHODS
  Lamivudine (3TC) as a positive control. Then, HBV DNA in treated 2.2.15 cells and the Hepatitis B surface antigen (HBsAg) in the culture supernatants were detected to determine the inhibitory effect of beta-L-D4A. At the same time, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) was used to detect the survival ratio of 2.2.15 cells.
  
  
  RESULTS
  beta-L-D4A has a dose-dependent inhibitory effect on HBV DNA replication; this effect was apparent when the concentration was above 1 mol/L. When beta-L-D4A was at the highest concentration, 100 mol/L, the HBsAg inhibition ratio was above 50%. The Therapeutic index (TI) of beta-L-D4A was above 2.1.
  
  
  CONCLUSIONS
  beta-L-D4A has a dose-dependent inhibitory effect on the replication of HBV DNA and the secretion of HBsAg at low toxicity.
authors.affiliation: Institute of Liver Diseases, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China.
authors.forename: Lin-Lin
authors.initials: LL
authors.lastname: Gao
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Wang
authors.forename: Ju-Sheng
authors.initials: JS
authors.lastname: Lin
authors.forename: Ying-Hui
authors.initials: YH
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
mesh_terms: D000998:Antiviral Agents / Q000494:pharmacology*; D002460:Cell Line; D004261:DNA Replication / Q000187:drug effects; D004279:DNA, Viral / Q000737:chemistry; D016048:Dideoxyadenosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D006509:Hepatitis B / Q000188:drug therapy*; D006514:Hepatitis B Surface Antigens / Q000378:metabolism; D006515:Hepatitis B virus / Q000378:metabolism*; D006801:Humans; D019259:Lamivudine / Q000494:pharmacology; D008956:Models, Chemical; D013778:Tetrazolium Salts / Q000494:pharmacology; D013844:Thiazoles / Q000494:pharmacology; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D006514:Hepatitis B Surface Antigens; D013778:Tetrazolium Salts; D013844:Thiazoles; D019259:Lamivudine; D016048:Dideoxyadenosine; C075923:2'3'-didehydro-2'3'-dideoxyadenosine; C022616:thiazolyl blue