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분자영상 및 방사화학
- 2015년 08월호
Effect of PEG pairing on the efficiency of cancer-targeting liposomes.(카이스트/ Phei Er Saw,전상용*)
- 출처
- Theranostics.
- 등재일
- 2015 Apr 5
- 저널이슈번호
- 5(7):746-54. doi: 10.7150/thno.10732.
- 내용
AbstractStandardized poly(ethylene glycol)-modified (PEGylated) liposomes, which have been widely used in research as well as in pre-clinical and clinical studies, are typically constructed using PEG with a molecular weight of 2000 Da (PEG(2000)). Targeting ligands are also generally conjugated using various functionalized PEG(2000)). However, although standardized protocols have routinely used PEG(2000), it is not because this molecular weight PEG has been optimized to enhance tumor uptake of nanoparticles. Herein, we investigated the effect of various PEG lipid pairings--that is, PEG lipids for targeting-ligand conjugation and PEG lipids for achieving 'stealth' function--on in vitro cancer cell- and in vivo tumor-targeting efficacy. A class of high-affinity peptides (aptides) specific to extra domain B of fibronectin (APT(EDB)) was used as a representative model for a cancer-targeting ligand. We synthesized a set of aptide-conjugated PEGylated phospholipids (APT(EDB)‑PEG(2000))‑DSPE and APT(EDB)‑PEG(2000))‑DSPE) and then paired them with methoxy-capped PEGylated phospholipids with diverse molecular weights (PEG(2000)), PEG(2000)), PEG(2000)), and PEG(2000))) to construct various aptide-conjugated PEGylated liposomes. The liposomes with APT(EDB)‑PEG(2000))/PEG(2000)) and APT(EDB)‑PEG(2000))/PEG(2000)) pairings had the highest uptake in EDB-positive cancer cells. Furthermore, in a U87MG xenograft model, APT(EDB)‑PEG(2000))/PEG(2000)) liposomes retarded tumor growth to the greatest extent, followed closely by APT(EDB)‑PEG(2000))/PEG(2000)) liposomes. Among the PEGylated liposomes tested, pairs in which the methoxy-capped PEG length was about half that of the targeting ligand-displaying PEG exhibited the best performance, suggesting that PEG pairing is a key consideration in the design of drug-delivery vehicles.
Author Information
Saw PE1, Park J2, Lee E2, Ahn S2, Lee J3, Kim H2, Kim J2, Choi M2, Farokhzad OC4, Jon S2.
11. KAIST Institute for the BioCentury, Department of Biological Sciences, Korea Advanced Institute of Science and technology (KAIST), 291 Daehak-ro, Daejeon 305-701, Republic of Korea. ; 2. Laboratory of Nanomedicine and Biomaterials, Department of Anesthesiology, Brigham and Women's Hospital Harvard Medical School, Boston, MA 02115, U.S.A.
21. KAIST Institute for the BioCentury, Department of Biological Sciences, Korea Advanced Institute of Science and technology (KAIST), 291 Daehak-ro, Daejeon 305-701, Republic of Korea.
33. School of Life Sciences, Gwangju Institute of Science and Technology, 123-Cheomdangwagi-ro, Gwangju 500-712, Republic of Korea.
42. Laboratory of Nanomedicine and Biomaterials, Department of Anesthesiology, Brigham and Women's Hospital Harvard Medical School, Boston, MA 02115, U.S.A.
- 키워드
- aptides; liposomes ; cancer therapy ; poly(ethylene glycol) ; drug delivery ; extra domain B of fibronectin
- 연구소개
- 현재 약물전달체로 많이 사용하고 있는 리포좀은 혈액순환 시간을 늘리고 면역시스템을 회피하기 위해 ‘스텔스 기능’을 지닌 PEGylated liposome입니다. 그런데 암 표적형 리포좀을 개발하기 위해서는 특정 표적리간드를 표면에 도입하게 됩니다. 이 논문에서는 표적리간드가 결합된 PEG와 결합되지 않은 ‘배경PEG’사이의 길이 비율이 아주 중요하다는 것을 실제 암 동물모델에서 암 표적능 및 치료 효능을 비교함으로써 보여준 것입니다. 따라서 암 진단 및 치료를 위한 표적형 리포좀 연구를 수행하는 연구자들에게 도움이 될 만한 좋은 정보라 생각합니다.
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