title: [The age-related changes of P53 protein expression in oral mucosa and their effects on oral leukoplakia].
abstract: OBJECTIVE
  To investigate the age-related changes of P53 protein expression in oral mucous membrane and their effects on pathogenesis of the oral precancerous lesions in elderly people.
  
  
  METHODS
  An immunohistochemical technique (SP method) was applied to study the changes of P53 expression in normal oral mucosa and oral leukoplakia(OLK) in different age groups. The staining results were evaluated by semi-quantity method.
  
  
  RESULTS
  With aging, an elevating tendency of P53 protein level exhibited in the normal oral mucosa and OLK, respectively. The P53 level in the old with OLK was higher than that in the normal oral mucosa of the old (P < 0.01).
  
  
  CONCLUSIONS
  With aging, P53 protein may undergo dysfunction, lead to imperfect DNA repair and excessive DNA damage accumulation, and ultimately facilitate malignant transformation of the oral mucosa in the old.
authors.affiliation: Oral Medicine Research Laboratory, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Ya
authors.initials: Y
authors.lastname: Yang
authors.forename: Hongmei
authors.initials: H
authors.lastname: Zhou
authors.forename: Min
authors.initials: M
authors.lastname: Zhou
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Zhixiu
authors.initials: Z
authors.lastname: He
authors.forename: Bingqi
authors.initials: B
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000378:metabolism*; D004260:DNA Repair; D005260:Female; D006801:Humans; D007972:Leukoplakia, Oral / Q000235:genetics / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009061:Mouth Mucosa / Q000378:metabolism*; D011230:Precancerous Conditions / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D016159:Tumor Suppressor Protein p53