期刊
HELIYON
卷 7, 期 7, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.heliyon.2021.e07581
关键词
Pomalidomide; Cyclodextrin complexation; Inclusion complex; Solubility; Comparative dissolution; Pomalyst (R)
资金
- European Regional Development Fund [GINOP2.3.415201600004]
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
- Ministry for Innovation and Technology [UNKP-20-5-SE-14]
The inclusion complexation of pomalidomide with sulfobutylether-beta-cyclodextrin significantly enhances the water solubility of pomalidomide and maintains its anti-angiogenic activity. Various analytical techniques were employed to characterize the complex, confirming a 1:1 stoichiometry between pomalidomide and sulfobutylether-beta-cyclodextrin.
Pomalidomide (POM), a potent anticancer thalidomide analogue was characterized in terms of cyclodextrin complexation to improve its aqueous solubility and maintain its anti-angiogenic activity. The most promising cyclodextrin derivatives were selected by phase-solubility studies. From the investigated nine cyclodextrins - differing in cavity size, nature of substituents, degree of substitution and charge - the highest solubility increase was observed with sulfobutylether-beta-cyclodextrin (SBE-beta-CD). The inclusion complexation between POM and SBE beta-CD was further characterized with a wide variety of state-of-the-art analytical techniques, such as nuclear magnetic resonance spectroscopy (NMR), infrared spectroscopy (IR), circular dichroism spectroscopy, fluorescence spectroscopy as well as X-ray powder diffraction method (XRD). Job plot titration by NMR and the AL-type phase-solubility diagram indicated 1:1 stoichiometry in a liquid state. Complementary analytical methods were employed for the determination of the stability constant of the complex; the advantages and disadvantages of the different approaches are also discussed. Inclusion complex formation was also assessed by molecular modelling study. Solid state complexation in a 1:1 M ratio was carried out by lyophilization and investigated by IR and XRD. The complex exhibited fast-dissolution with immediate release of POM, when compared to the pure drug at acidic and neutral pH. Kinetic analysis of POM release from lyophilized complex shows that Korsmeyer-Peppas and Weibull model described the best the dissolution kinetics. The cytotoxicity of the complex was tested against the LP-1 human myeloma cell line which revealed that supramolecular interactions did not significantly affect the anti-cancer activity of the drug. Overall, our results suggest that the inclusion complexation of POM with SBE beta-CD could be a promising approach for developing more effective POM formulations with increased solubility.
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