Characterization of a novel bisacridone and comparison with PSC 833 as a potent and poorly reversible modulator of P-glycoprotein

Horton, J. K. and Thimmaiah, K. N. and Altenberg, G. A. and Castro, A. F. and Germain, G. S. and Krishnegowda, G. and Houghton, P. J. (1997) Characterization of a novel bisacridone and comparison with PSC 833 as a potent and poorly reversible modulator of P-glycoprotein. Molecular Pharmacology, 52 (6). pp. 948-957. ISSN 0026-895X

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Abstract

Novel compounds, composed of two acridone moieties connected by a propyl or butyl spacer, were synthesized and tested as potential modulators of P-glycoprotein (P-gp)-mediated multidrug resistance. The propyl derivative 1,3-bis(9-oxoacridin-10-yl)-propane (PBA) was extremely potent and, at a concentration of 1 mu M, increased steady state accumulation of vinblastine (VLB) approximate to 9-fold in the multidrug-resistant cell line KB8-5. In contrast to the readily reversible effects of VRP and cyclosporin A on VLB uptake and similar to the effects of the cyclosporin analog PSC 833, this modulation by PBA was not fully reversed 6-8 hr after transfer of cells to PBA-free medium. Continuous exposure to 3 mu M PBA was nontoxic and could completely reverse VLB resistance in KB8-5 cells. Consistent with its effects on VLB transport, the drug resistance-modulating effect of PSC 833 was significantly more persistent than that of VRP. However, the effect of PEA was, like that of VRP, rapidly reversed once the modulator was removed from the extracellular environment. PEA was able to compete with radiolabeled azidopine for binding to P-gp and to stimulate P-gp ATPase activity, However, both the steady state accumulation of PEA and the rate of efflux of PBA were similar in drug-sensitive KB3-1 and drug-resistant KB8-5 cells, suggesting that this compound is not efficiently transported by P-gp. These results indicate that PEA represents a new class of potent and poorly reversible synthetic modulators of P-gp-mediated VLB transport.

Item Type: Article
Additional Information: Unmapped bibliographic data: ST - Characterization of a novel bisacridone and comparison with PSC 833 as a potent and poorly reversible modulator of P-glycoprotein [Field not mapped to EPrints] AN - WOS:000071023400004 [Field not mapped to EPrints]
Subjects: Physical Sciences > Chemistry
Divisions: PG Campuses > Manasagangotri, Mysore > Chemistry
Depositing User: Users 21 not found.
Date Deposited: 02 May 2013 10:35
Last Modified: 08 Oct 2015 11:00
URI: http://eprints.uni-mysore.ac.in/id/eprint/6673

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