title: Expression of proteins associated with therapy resistance in rhabdomyosarcoma and neuroblastoma tumour cells.
abstract: The activity of multidrug resistance (MDR) proteins in tumour cells is associated with an increased resistance to therapy and in consequence with a decreased effectiveness of chemotherapy. The majority of MDR molecules belong to a family of ABC (ATP binding cassette) transporters. Neuroblastoma (NBL) and rhabdomyosarcoma (RMS) are common solid tumours of childhood. The response to therapy is better in NBL, worse in RMS, but still unsatisfactory despite surgery and aggressive chemotherapy. The immunohistochemical staining for p-gp (p-glycoprotein), MRP1 (multidrug resistance associated protein 1), BCRP (breast cancer resistance protein) and LRP (lung resistance protein) expression was performed in primary tumour sections of NBL (10 cases) and RMS (10 cases). A different pattern of MDR expression in NBL and RMS were noted. In NBL, MRP1 was expressed in all studied tumours, p-gp, BCRP only in 3 out of 10 tumours, LRP, in 4 cases. The combination of more than one protein was noted in the majority of NBL tumours. In RMS, the expression of 3 or 4 MDR proteins was noted in 9 cases. The high expression of an MDR protein profile in RMS suggests various mechanisms acting simultaneously, which might explain chemotherapy resistance and a low percentage of long-time survival in this tumour.
authors.affiliation: Department of Clinical Immunology, Polish-American Institute of Paediatrics, Jagiellonian University Medical College, ul. Wielicka 265, 30-663 Kraków. mipituch@cyf-kr.edu.pl
authors.forename: Anna
authors.initials: A
authors.lastname: Pituch-Noworolska
authors.forename: Marcin
authors.initials: M
authors.lastname: Zaremba
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Wieczorek
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B / Q000378:metabolism*; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters / Q000378:metabolism; D000008:Abdominal Neoplasms / Q000188:drug therapy / Q000378:metabolism; D000293:Adolescent; D000970:Antineoplastic Agents / Q000627:therapeutic use; D002648:Child; D002675:Child, Preschool; D019008:Drug Resistance, Neoplasm; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000378:metabolism; D009363:Neoplasm Proteins / Q000378:metabolism; D009447:Neuroblastoma / Q000188:drug therapy / Q000378:metabolism*; D010386:Pelvic Neoplasms / Q000188:drug therapy / Q000378:metabolism; D012189:Retrospective Studies; D012208:Rhabdomyosarcoma / Q000188:drug therapy / Q000378:metabolism*; D020394:Vault Ribonucleoprotein Particles / Q000378:metabolism; D000099187:Major Vault Protein
chemical_list: D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters; D000970:Antineoplastic Agents; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D009363:Neoplasm Proteins; D020394:Vault Ribonucleoprotein Particles; D000099187:Major Vault Protein; C116614:ABCG2 protein, human; C421109:multidrug resistance-associated protein 1