title: [Expression of the proteins associated with transforming growth factor-beta/Smad signaling pathway in Peutz-Jeghers syndrome].
abstract: OBJECTIVE
  To detect the expression of important proteins associated with transforming growth factor-beta (TGF-beta)/Smad signaling pathway in Peutz-Jeghers syndrome (PJS) and investigate the correlation of these proteins to LKB1 gene expression.
  
  
  METHODS
  The expression and localization of LKB1, TGFbeta1 and pSmad2 proteins in 20 PJS polyp samples and normal intestinal mucosal tissues were detected with immunohistochemical staining.
  
  
  RESULTS
  The expressions of LKB1, TGFbeta1 and pSmad2 were lower in PJS polyps than in normal mucosa, and the differences in LKB1 and TGFbeta1 proteins were significantly different between them (P<0.05). In PJS polyps, positive correlations were found between LKB1 and TGFbeta1 and between TGFbeta1 and pSmad2 expressions.
  
  
  CONCLUSIONS
  TGFbeta/Smad pathway is probably subjected to the regulation by LKB1 and may play a role in the occurrence of PJS.
authors.affiliation: Guangdong Provincial Key Laboratory of Gastroenterology/Department of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. wyjsunshine@163.com
authors.forename: Yu-jing
authors.initials: YJ
authors.lastname: Wang
authors.forename: Lian-jie
authors.initials: LJ
authors.lastname: Li
authors.forename: Bao-ping
authors.initials: BP
authors.lastname: Wu
authors.forename: Bo
authors.initials: B
authors.lastname: Jiang
mesh_terms: D000091162:AMP-Activated Protein Kinase Kinases; D006801:Humans; D007150:Immunohistochemistry; D010580:Peutz-Jeghers Syndrome / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D051899:Smad2 Protein / Q000235:genetics / Q000378:metabolism*; D016212:Transforming Growth Factor beta / Q000235:genetics / Q000378:metabolism*
chemical_list: C497782:SMAD2 protein, human; D051899:Smad2 Protein; D016212:Transforming Growth Factor beta; D017346:Protein Serine-Threonine Kinases; C109790:STK11 protein, human; D000091162:AMP-Activated Protein Kinase Kinases