title: [Effects of gamma-interferon on gene expression of collagen I, III and on the tissue inhibitor of metalloprotenase 1 in HSC-T6 cells].
abstract: OBJECTIVE
  To observe the in vitro effects of gamma-interferon (IFNgamma) on gene expression of collagen I (Col I), III (Col III) and tissue inhibitor of metalloprotenase 1 (TIMP1) of HSC-T6 cells.
  
  
  METHODS
  Cultured HSC-T6 cells were exposed to IFNgamma at concentrations of 0.1, 1, 10, 10(2), 10(3), 10(4), 2.5 x 10(5), 5 x10(5) U/ml for 48 hours. 4,5-simethylthiazaoly colormetric assay was used to evaluate the effect of IFNgamma on HSC-T6 cell proliferation. After incubating with IFNgamma (1 U/ml, 10(2) U/ml and 10(4) U/ml) for 48 hours, HSC-T6 cells were harvested to detect Col I, Col III and TIMP1 steady state mRNA levels by quantitative reverse-transcription polymerase chain reaction (RT-PCR).
  
  
  RESULTS
  The Col I, Col III and TIMP1 mRNA levels of the control group were 2.86+/-0.21, 2.00+/-0.23 and 3.90+/-0.81, respectively. Col I and Col III mRNA levels in HSC-T6 cells treated by different concentrations of IFNgamma were lower than that of the controls (P < 0.01). There was no significant difference in TIMP1 mRNA levels between IFNgamma groups and controls.
  
  
  CONCLUSIONS
  IFNgamma suppresses expression of Col I and Col III whereas it has no effect on TIMP1 mRNA expression. The antifibrotic mechanism of IFNgamma may be partly due to its down-regulation of Col I and Col III mRNA levels in HSC-T6 cells.
authors.affiliation: Liver Research Center, Beijing Friendship Hospital, Capital University of Medical Sciences, Beijing 100050, China. mahongmd@yahoo.com.cn
authors.forename: Hong
authors.initials: H
authors.lastname: Ma
authors.forename: Xue-mei
authors.initials: XM
authors.lastname: Ma
authors.forename: Cheng-hong
authors.initials: CH
authors.lastname: Yin
authors.forename: Ji-dong
authors.initials: JD
authors.lastname: Jia
authors.forename: Bao-en
authors.initials: BE
authors.lastname: Wang
mesh_terms: D000818:Animals; D002460:Cell Line; D024042:Collagen Type I / Q000096:biosynthesis* / Q000235:genetics; D024061:Collagen Type III / Q000096:biosynthesis* / Q000235:genetics; D022781:Hepatocytes / Q000166:cytology / Q000378:metabolism*; D007371:Interferon-gamma / Q000494:pharmacology*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D024042:Collagen Type I; D024061:Collagen Type III; D012333:RNA, Messenger; D019715:Tissue Inhibitor of Metalloproteinase-1; D007371:Interferon-gamma