de Wolf FA, Demel RA, Bets D, van Kats C, de Kruijff B. Characterization of the interaction of doxorubicin with (poly)phosphoinositides in model systems. Evidence for specific interaction with phosphatidylinositol-monophosphate and -diphosphate.
FEBS Lett 1991;
288:237-40. [PMID:
1652476 DOI:
10.1016/0014-5793(91)81043-8]
[Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The anticancer drug doxorubicin penetrates into Langmuir monolayers containing phosphoinositides. Upon binding of doxorubicin to phosphoinositide-containing SUV, its fluorescence is self-quenched due to self-association. As compared to other anionic phospholipids, as much as 2- to 3-fold larger effects were obtained with PIP and PIP2, in mixtures of these lipids with DOPC. Doxorubicin competes efficiently with the non-penetrating antibiotic neomycin for binding to PIP2. According to its penetration, specific binding of doxorubicin was half-maximal at 5-15 microM. It is likely that also in biological membranes doxorubicin binds specifically to PIP and PIP2.
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