title: Expression of the multidrug resistance protein MRP and the lung-resistance protein LRP in nasal NK/T cell lymphoma: further exploring the role of P53 and WT1 gene.
abstract: OBJECTIVE
  Nasal NK/T-cell lymphoma (NKTL) is relatively common in the adult men of Asia. Many patients with nasal NKTL have poor response to therapy. Some of them show P-glycoprotein over-expression. To investigate the expression of other multidrug resistance proteins (MDR) and possible regulatory factors in nasal NKTL, the clinical and pathological features are described.
  
  
  METHODS
  Thirty Chinese adults with nasal NKTL are presented. Immunohistochemical study was carried out to detect multidrug resistance-associated protein 1 (MRP) and lung resistance-related protein (LRP). The association between possible regulatory proteins (P53 and WT1) and MDR were explored. In situ hybridisation for Epstein-Barr virus (EBV) detection, polymerase chain reaction assay for T-cell receptor gene and direct sequencing for the P53 gene were performed.
  
  
  RESULTS
  Seven (23.3%) and eight (26.7%) patients showed immunoreactivity of MRP and LRP, respectively. Positive staining for both markers was identified in 6.7% (2 cases). The EBV was detected in most cases (97%). Twenty-six (86.7%) cases expressed positive nuclear staining of P53. However, of the cases analysed for P53 mutation, none showed a mutaion at the hot spots studied. WT1 protein was not detected in the nasal NKTL.
  
  
  CONCLUSIONS
  Our study reports expression of MRP and LRP in nasal NKTL. The over-expression of P53 is probably associated with high incidence of EBV infection and unlikely a regulatory protein for the expression of MRP and LRP. Further studies are necessary to validate the association between P53 mutation and expression of MRP and LRP in nasal NKTL.
authors.affiliation: Department of Pathology, Chang Gung Memorial Hospital, Kaohsiung Medical Center, Chang Gung University College of Medicine, Kaohsiung, Taiwan.
authors.forename: Wan-Ting
authors.initials: WT
authors.lastname: Huang
authors.forename: Chao-Cheng
authors.initials: CC
authors.lastname: Huang
authors.forename: Shao-Wen
authors.initials: SW
authors.lastname: Weng
authors.forename: Hock-Liew
authors.initials: HL
authors.lastname: Eng
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000096:biosynthesis*; D019002:CD56 Antigen / Q000378:metabolism; D020031:Epstein-Barr Virus Infections / Q000150:complications; D005260:Female; D004854:Herpesvirus 4, Human; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D054391:Lymphoma, Extranodal NK-T-Cell / Q000378:metabolism* / Q000473:pathology / Q000821:virology; D008297:Male; D008875:Middle Aged; D009154:Mutation; D009669:Nose Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000821:virology; D016133:Polymerase Chain Reaction; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis* / Q000235:genetics; D020394:Vault Ribonucleoprotein Particles / Q000096:biosynthesis*; D025721:WT1 Proteins / Q000096:biosynthesis* / Q000235:genetics; D000099187:Major Vault Protein
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D019002:CD56 Antigen; D016159:Tumor Suppressor Protein p53; D020394:Vault Ribonucleoprotein Particles; D025721:WT1 Proteins; D000099187:Major Vault Protein