Preparation and Release Behavior of Ipriflavone-Loaded PLGA Microsphere for Tissue Engineered Bone

이프리플라본을 함유한 생분해성 PLGA 미립구의 제조 및 조직공학적 골재생을 위한 영향평가

  • So, Jung-Won (Polymer BIN Fusion Research Center, Chonbuk National University) ;
  • Jang, Ji-Wook (Polymer BIN Fusion Research Center, Chonbuk National University) ;
  • Kim, Soon-Hee (Polymer BIN Fusion Research Center, Chonbuk National University) ;
  • Kim, Geun-Ah (Polymer BIN Fusion Research Center, Chonbuk National University) ;
  • Choi, Jin-Hee (Polymer BIN Fusion Research Center, Chonbuk National University) ;
  • Rhee, John-M. (Polymer BIN Fusion Research Center, Chonbuk National University) ;
  • Son, Young-Suk (Musculoskeletal Bioorgan Center, Kyunghee University) ;
  • Min, Byoung-Hyun (Cell Theraphy Center, School of Medicine, Ajou University) ;
  • Khang, Gil-Son (Polymer BIN Fusion Research Center, Chonbuk National University)
  • 소정원 (전북대학교 고분자 BIN소재 융합연구센터) ;
  • 장지욱 (전북대학교 고분자 BIN소재 융합연구센터) ;
  • 김순희 (전북대학교 고분자 BIN소재 융합연구센터) ;
  • 김근아 (전북대학교 고분자 BIN소재 융합연구센터) ;
  • 최진희 (전북대학교 고분자 BIN소재 융합연구센터) ;
  • 이종문 (전북대학교 고분자 BIN소재 융합연구센터) ;
  • 손영숙 (경희대학교 근골격계 바이오 장기센터) ;
  • 민병현 (아주대학교 세포치료센터) ;
  • 강길선 (전북대학교 고분자 BIN소재 융합연구센터)
  • Published : 2009.01.25

Abstract

The aim of this research was to prepare microparticulate systems based on poly (lactide-co-glycolide)(PLGA) for the local release of ipriflavone in order to reduce bone loss. We developed the IP loaded PLGA microspheres using relatively simple oil-in-water(O/W) solvent evaporation method. HPLC was used to perform the in vitro release test of IP and morphology of cell attached on the micro-spheres was investigated using SEM. Cytotoxicity was assayed by cell counting kit-8 (CCK-8) test. Osteogenic differential cells were analyzed by ALP activity. Through RT-PCR analysis, we observed osteocalcin, ALP, and Type I collagen mRNA expression. The release of IP in vitro was more prolonged over 42 days and IP/PLGA microspheres showed the improvement on the cell proliferation, ALP activity and RT-PCR comparing with control (only PLGA). This initial research will be used to direct future work involved in developing this composite injectable bone tissue engineering system.

골 결손 치료를 위해 생분해성 고분자인 PLGA에 골다공증 치료제인 이프리플라본(IP)을 함유한 미립구를 O/W 유화 용매 증발법으로 제조하였으며, 생체외 방출실험에서 IP 방출량은 HPLC로 분석하였다. SEM을 이용하여 미립구에 부착된 세포의 거동을 확인하였으며, IP가 세포에 미치는 독성평가는 CCK-8 분석방법을 이용하여 측정하였다. 골 형성 지표인 ALP 활성도를 측정하였으며, 배양된 BMSCS의 골세포로의 표현형을 확인하기 위하여 RT-PCR을 수행하였다. 방출결과에서 IP 방출은 거의 40일 이상으로 지속적이었으며, IP를 함유한 미립구에서의 세포의 부착, 성장 등이 잘 이루어짐을 확인하였고, ALP 활성도 및 RT-PCR 분석결과에서도 단독의 PLGA 미립구보다 IP를 함유한 미립구에서의 값이 더 높은 것을 확인할 수 있었다. 본 실험결과를 바탕으로 향후 서방성 제제화에 있어서 IP/PLGA 미립구를 응용하게 되면 국소지향성 골분화 주사용 지지체로서 중요한 역할을 할 것으로 보인다.

Keywords

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