Tissue Eng Regen Med.  2017 Dec;14(6):743-753. 10.1007/s13770-017-0077-7.

Effect of Drug Carrier Melting Points on Drug Release of Dexamethasone-Loaded Microspheres

Affiliations
  • 1Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongtong-gu, Suwon 16499, Korea. moonskim@ajou.ac.kr
  • 2Department of Polymer Engineering, Pukyong National University, 365 Sinseon-ro, Nam-gu, Busan 48547, Korea.

Abstract

Here, we examined the effect of melting point of drug carriers on drug release of dexamethasone (Dex)-loaded microspheres. We prepared poly(L-lactide-ran-ε-caprolactone) (PLC) copolymers with varying compositions of poly(εcaprolactone) (PCL) and poly(L-lactide) (PLLA). As the PLLA content increased, the melting points of PLC copolymers decreased from 61 to 43 ℃. PLC copolymers in vials solubilized at 40-50 ℃ according to the incorporation of PLLA into the PCL segment. Dexamethasone (Dex)-loaded PLC (MCxLy) microspheres were prepared by the oil-in-water (O/W) solvent evaporation/extraction method. The preparation yields were above 70%, and the mean particle size ranged from 30 to 90 µm. The MC(x)L(y) microspheres also showed controllable melting points in the range of 40-60 ℃. Dex-loaded MC(x)L(y) microspheres showed similar in vitro and in vivo sustained release patterns after the initial burst of Dex. The in vitro and in vivo order of the Dex release was MC₈₀Lâ‚‚â‚€>MC₉₀L₁₀>MC₉₅Lâ‚…, which agreed well with the melting point order of the drug carrier. Using in vivo fluorescence imaging of fluorescein (FI)-loaded microspheres implanted in animals, we confirmed the sustained release of FI over an extended period. In vivo inflammation associated with the PLC microsphere implants was less pronounced than that associated with Poly(lactide-co-glycolide) (PLGA). In conclusion, we successfully demonstrated that it is possible to control Dex release using Dex-loaded MC(x)L(y) microspheres with different melting points.

Keyword

Microsphere; Block copolymer; Melting point; Drug release; Dexamethasone

MeSH Terms

Animals
Dexamethasone
Drug Carriers*
Drug Liberation*
Fluorescein
Freezing*
In Vitro Techniques
Inflammation
Methods
Microspheres*
Optical Imaging
Particle Size
Polyglactin 910
Dexamethasone
Drug Carriers
Fluorescein
Polyglactin 910
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