title: Quantitative and functional assay of MDR1/P170-mediated MDR in ascites cells of patients with ovarian cancer.
abstract: BACKGROUND
  MDR1-associated P-glycoprotein-dependent multidrug resistance is a common cause of chemotherapy failure in patients with advanced ovarian cancer. Here, we describe a clinical method for simultaneously assessing the expression and function of the MDR1/Pgp in tumour cells from ascites of patients with malignant ovarian carcinoma.
  
  
  METHODS
  Cells from ascites from 35 patients were collected. The expression and function of Pgp were detected by flow cytometry. For functional study, rhodamine 123 was used.
  
  
  RESULTS
  Using the Pgp-specific UIC2 and MM6.15 antibodies, we demonstrated the presence of Pgp in 10-79% (38.9+/-20, 7; n=35) of the CA 125-positive cell subpopulations. The results of the functional assay showed strong correlation with the level of Pgp expression (r=0.976; p=3.2x10(-5)).
  
  
  CONCLUSIONS
  Direct detection of the expression level and function of MDR1/Pgp in the ascites provide useful information for the more efficient treatment of malignant diseases by proper adjustment of the chemotherapeutic protocol.
authors.affiliation: Department of Obstetrics and Gynaecology, University of Debrecen, Hungary. krasznai@jaguar.dote.hu
authors.forename: Zoárd Tibor
authors.initials: ZT
authors.lastname: Krasznai
authors.forename: Elza
authors.initials: E
authors.lastname: Friedländer
authors.forename: András
authors.initials: A
authors.lastname: Nagy
authors.forename: Gábor
authors.initials: G
authors.lastname: Szabó
authors.forename: György
authors.initials: G
authors.lastname: Vereb
authors.forename: Katalin
authors.initials: K
authors.lastname: Goda
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Hernádi
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000096:biosynthesis / Q000378:metabolism*; D000818:Animals; D001201:Ascites / Q000378:metabolism / Q000473:pathology; D018432:Drug Resistance, Multiple / Q000502:physiology*; D019008:Drug Resistance, Neoplasm; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D051379:Mice; D041681:NIH 3T3 Cells; D010051:Ovarian Neoplasms / Q000188:drug therapy* / Q000378:metabolism* / Q000473:pathology
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1