Osteotropic beta-cyclodextrin for local bone regeneration

Biomaterials
Xin-Ming LiuDong Wang

Abstract

An osteotropic alendronate-beta-cyclodextrin conjugate (ALN-beta-CD) was developed as a bone-targeting delivery system for improved treatment of skeletal diseases. The conjugate shows very strong binding to hydroxyapatite (HA, main component of the skeleton). Its ability in forming molecular inclusion complex with prostaglandin E(1) (PGE(1), a potent bone anabolic agent) was confirmed by phase solubility experiments and differential scanning calorimetry (DSC). In a bilateral rat mandible model, ALN-beta-CD/PGE(1) molecular complex was shown to stimulate strong local bone anabolic reaction. In the control study, ALN-beta-CD itself was also found to be bone anabolic. To investigate this finding, other control groups were studied. The histomorphometry data suggest that ALN-beta-CD itself could generate more new bone at the injection site than its complex with PGE(1). Alendronate (ALN) injection could also cause new bone formation, which locates peripheral to the site of injection. PGE(1), saline or ethanol injections do not have anabolic effect. These findings were also confirmed by micro-CT evaluation of mandibular bones. It is clear that the bone anabolic effect of ALN-beta-CD is independent of mechanical stimuli of the perioste...Continue Reading

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Citations

Mar 29, 2011·Molecular Pharmaceutics·Yeonju LeeRichard A Reinhardt
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