Title : Reversal of vinblastine transport by chlorpromazine in membrane vesicles from multidrug-resistant human CCRF-CEM leukaemia cells.

Pub. Date : 1998 Aug

PMID : 9703277






5 Functional Relationships(s)
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Compound Name
Protein Name
Organism
1 2-Chlorpromazine (10 microM) completely inhibited ATP-dependent P-glycoprotein-mediated vinblastine accumulation in the vesicles. Vinblastine ATP binding cassette subfamily B member 1 Homo sapiens
2 The results were consistent with a two-state concerted model in which P-glycoprotein exists in two conformational states, P(A) and P(B), where 2-chlorpromazine is transported by the conformer, P(A), and vinblastine by the conformer, P(B). Vinblastine ATP binding cassette subfamily B member 1 Homo sapiens
3 We propose a minimal kinetic model whereby in these preloaded vesicles the complex VV.P(A).CC is formed, where two internal binding sites of P-glycoprotein (P(A)) are occupied by vinblastine (V) and the two external sites are occupied by 2-chlorpromazine (C). Vinblastine ATP binding cassette subfamily B member 1 Homo sapiens
4 When the two binding sites on both the inside and outside of P-glycoprotein are saturated with ligands vinblastine is effluxed at a very rapid rate, and vice versa when vesicles are preloaded with 2-chlorpromazine and vinblastine is added outside. Vinblastine ATP binding cassette subfamily B member 1 Homo sapiens
5 When the two binding sites on both the inside and outside of P-glycoprotein are saturated with ligands vinblastine is effluxed at a very rapid rate, and vice versa when vesicles are preloaded with 2-chlorpromazine and vinblastine is added outside. Vinblastine ATP binding cassette subfamily B member 1 Homo sapiens