Journal
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
Volume 25, Issue 19, Pages 4197-4202Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2015.08.004
Keywords
P2X(7) receptor antagonists; Nanoparticles; Encapsulation; pH sensitive polymer; Poly(tetrahydropyran-2-yl methacrylate) (poly(THPMA))
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2013R1A1A2059917]
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We have developed nanoparticles of anti-inflammatory P2X(7) receptor antagonist encapsulated in a pH-sensitive polymer, poly(tetrahydropyran-2-yl methacrylate) (poly(THPMA)), as a potential local drug delivery system to target to acidic inflammatory environments, in which P2X(7) receptors are implicated in the pathology of inflammation via the activation of immune cells. The nanoparticles were prepared using single emulsion methods, also their size and shape were confirmed by microscopy and spectroscopy, etc. The profiles of the pH-dependent degradation, release of antagonist and biological activities were investigated. The nanoparticles that encapsulated the 3,5-dichloropyridine derivative (2) with poly (THPMA), were observed to be more slowly cleaved than the blank nanoparticles. Moreover, the free P2X(7) receptor antagonists potently inhibited the receptor activation, whereas the nanoparticles of the 3,5-dichloropyridine derivative (2) encapsulated poly(THPMA) exhibited much lower P2X(7) antagonistic activity through sustained encapsulation. Thus, the nanoparticles of the 3,5-dichloropyridine derivative (2) encapsulated poly(THPMA) may be utilized to develop a pH-sensitive local drug delivery system for controlled release of anti-inflammatory therapeutics in acidic physiological environments. (C) 2015 Elsevier Ltd. All rights reserved.
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