title: Study of the mechanisms underlying the reversal of multidrug resistance of human neuroblastoma multidrug-resistant cell line SK-N-SH/MDR1 by low-intensity pulsed ultrasound.
abstract: The aim of the present study was to investigate the underlying mechanism(s) involved in reversing multidrug resistance (MDR) of SK-N-SH/MDR1 by low-intensity pulsed ultrasound (LIPUS). Membrane alteration of SK-N-SH/MDR1 cells exposed to LIPUS was analyzed by scanning electron microscopy (SEM). Immunofluorescence and western blotting were used\ to detect changes in the expression of the MDR-related proteins P-glycoprotein (P-gp), multidrug resistance protein 1 (MRP1) and glutathione-s-transferase-π (GST-π) after the optimum ultrasonic. The optimum ultrasonic conditions were 0.3 MHz, 1.0 W/cm², 40 sec and the chemosensitivity of SK-N-SH/MDR1 cells was significantly increased (P<0.05). The optimum ultrasonic-induced perforation of the irradiated cell membranes was observed by SEM. The expression of P-gp was significantly decreased in the group treated by optimum ultrasonic (P<0.05), but not the expressions of MRP1 or GST-π (P>0.05). We demonstrated that LIPUS effectively reverses the MDR of SK-N-SH/MDR1, presumably via augmenting membrane permeability and decreasing the P-gp expression of SK-N-SH/MDR1.
authors.affiliation: Laboratory of Oncology, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Key Laboratory of Pediatrics in Chongqing and Chongqing International Science and Technology Cooperation Center for Child Development and Disorders, Chongqing 400014, PR China.
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Sun
authors.forename: Qin
authors.initials: Q
authors.lastname: Li
authors.forename: Youhua
authors.initials: Y
authors.lastname: Xu
authors.forename: Conglun
authors.initials: C
authors.lastname: Pu
authors.forename: Lihua
authors.initials: L
authors.lastname: Zhao
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Guo
authors.forename: Xionghui
authors.initials: X
authors.lastname: Ding
authors.forename: Xianqing
authors.initials: X
authors.lastname: Jin
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B / Q000378:metabolism; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism; D000256:Adenoviridae / Q000235:genetics / Q000378:metabolism; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002460:Cell Line; D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D002463:Cell Membrane Permeability / Q000187:drug effects / Q000502:physiology; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D051549:Glutathione S-Transferase pi / Q000378:metabolism; D057809:HEK293 Cells; D006801:Humans; D009447:Neuroblastoma / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000378:metabolism / Q000628:therapy*; D014464:Ultrasonic Therapy / Q000379:methods*; D014463:Ultrasonography
chemical_list: C513055:ABCB1 protein, human; D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D051549:Glutathione S-Transferase pi