title: Influence of quercetin and x-ray on collagen synthesis of cultured human keloid-derived fibroblasts.
abstract: OBJECTIVE
  To investigate the effects of quercetin and X-ray on collagen synthesis of cultured human keloid-derived fibroblast and the mechanism.
  
  
  METHODS
  Collagen synthesis of cultured human keloid and normal fibroblasts were detected by hydroxyproline colorimetric analysis. Immunocytochemical staining was used to investigate collagen I and III expression. mRNA expression of collagen I and III, and transforming growth factor (TGF)-beta 1 were assayed by reverse transcription-polymerase chain reaction (RT-PCR) and real-time PCR.
  
  
  RESULTS
  Quercetin inhibited the collagen synthesis of both keloid and normal fibroblasts in a dose-dependent manner. Immunocytochemical staining indicated that collagen I and III were down-regulated by quercetin and X-ray (P < 0.05), particularly collagen I (P < 0.05). mRNA expression of both collagen I and III in quercetin groups significantly decreased compared with that in control group (P < 0.05), especially in the group treated with both quercetin and X-ray (P < 0.01). mRNA level of TGF-beta 1 gene was down-regulated by quercertin (P < 0.05).
  
  
  CONCLUSIONS
  Quercetin will probably be one of the new medicines which could effectively treat keloid. Quercetin combined with X-ray could reduce the dose of radiation.
authors.affiliation: Plastic & Aesthetic Surgery Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730.
authors.forename: Xiao
authors.initials: X
authors.lastname: Long
authors.forename: Xuan
authors.initials: X
authors.lastname: Zeng
authors.forename: Fu-quan
authors.initials: FQ
authors.lastname: Zhang
authors.forename: Xiao-jun
authors.initials: XJ
authors.lastname: Wang
mesh_terms: D000328:Adult; D002478:Cells, Cultured; D024042:Collagen Type I / Q000096:biosynthesis* / Q000235:genetics / Q000528:radiation effects; D024061:Collagen Type III / Q000096:biosynthesis* / Q000235:genetics / Q000528:radiation effects; D004305:Dose-Response Relationship, Drug; D005260:Female; D005347:Fibroblasts / Q000378:metabolism* / Q000473:pathology / Q000528:radiation effects; D006801:Humans; D007627:Keloid / Q000378:metabolism* / Q000473:pathology; D008297:Male; D011794:Quercetin / Q000008:administration & dosage / Q000494:pharmacology*; D012333:RNA, Messenger / Q000096:biosynthesis; D012867:Skin / Q000166:cytology; D053773:Transforming Growth Factor beta1 / Q000096:biosynthesis / Q000235:genetics / Q000528:radiation effects
chemical_list: D024042:Collagen Type I; D024061:Collagen Type III; D012333:RNA, Messenger; D053773:Transforming Growth Factor beta1; D011794:Quercetin