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  • Title: Development of a novel self-dissolving microneedle array of alendronate, a nitrogen-containing bisphosphonate: evaluation of transdermal absorption, safety, and pharmacological effects after application in rats.
    Author: Katsumi H, Liu S, Tanaka Y, Hitomi K, Hayashi R, Hirai Y, Kusamori K, Quan YS, Kamiyama F, Sakane T, Yamamoto A.
    Journal: J Pharm Sci; 2012 Sep; 101(9):3230-8. PubMed ID: 22467424.
    Abstract:
    Alendronate is a nitrogen-containing bisphosphonate that is widely used for the treatment of osteoporosis. In this study, we developed a novel self-dissolving micron-size needle array (microneedle array) containing alendronate, which was fabricated by micromodeling technologies using hyaluronic acid as a basic material. Micron-scale pores in the skin were seen after the application of the alendronate-loaded microneedle array, verifying establishment of transdermal pathways for alendronate. The absorption of alendronate after the application of alendronate-loaded microneedle array was almost equivalent to that after subcutaneous administration, and the bioavailability of alendronate was approximately 90% in rats. Furthermore, delivery of alendronate via this strategy effectively suppressed the decrease in the width of the growth plate in a rat model of osteoporosis. Although mild cutaneous irritation was observed after the application of the alendronate-loaded microneedle array, it resolved by day 15. These findings indicate that this alendronate-loaded microneedle array is a promising transdermal formulation for the treatment of osteoporosis.
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