Archives of Pharmacal Research

  • 제28권5호
  • /
  • Pages.626-635
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  • 2005
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  • 0253-6269(pISSN)
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  • 1976-3786(eISSN)
대한약학회 (The Pharmaceutical Society of Korea)
권호 표지

In Vitro and In Vivo Studies of Different Liposomes Containing Topotecan

  • Hao, Yan-Li (Department of Pharmaceutical Sciences, Shenyang Pharmaceutical University) ;
  • Deng, Ying-Jie (Department of Pharmaceutical Sciences, Shenyang Pharmaceutical University) ;
  • Chen, Yan (Department of Pharmaceutical Sciences, Shenyang Pharmaceutical University) ;
  • Wang, Xiu-Min (Department of Pharmaceutical Sciences, Shenyang Pharmaceutical University) ;
  • Zhong, Hai-Jun (Department of Pharmaceutical Sciences, Shenyang Pharmaceutical University) ;
  • Suo, Xu-Bin (Department of Pharmaceutical Sciences, Shenyang Pharmaceutical University)
  • 발행 : 2005.01.01
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초록

Liposome as a carrier of topotecan (TPT), a promising anticancer drug, has been reported in attempt to improve the stability and antitumor activity of TPT. However, the biodistr ibution pattern of TPT liposome in vivo and PEG-modified liposome containing TPT have not been studied systemically. In this paper, the in vitro stability and in vivo biodistribution behavior of several liposomes containing TPT with different lipid compositions and PEG-modification were studied. Compared with the 'fluid' liposome (S-Lip) composed of soybean phosphatidylcholine (SPC), the 'solid' liposome (H-Lip) composed of hydrogenated soybean phosphatidylcholine HSPC decreased the leaking efficiency of TPT from liposome and enhanced the stability of liposome in fetal bovine serum (FBS) or human blood plasma (HBP). The results of biodistribution studies in S$_{180}$ tumor-bearing mice showed that liposomal encapsulation increased the concentrations of total TPT and the ratio of lactone form in plasma. Compared with free TPT, S-Lip and H-Lip resulted in 5- and 19- fold increase in the area under the curve (AUC$_{0\rightarrow\propto}$), respectively. PEG- modified H-Lip (H-PEG) showed 3.7-fold increase in AUC$_{0\rightarrow\propto}$ compared with H-Lip, but there was no significant increase in t$_{1/2}$ and AUC$_{0\rightarrow\propto}$ for PEG-modified S-Lip (S-PEG) compared with S-Lip. Moreover, the liposomal encapsulation changed the biodistribution behavior, and H-Lip and H-PEG dramatically increased the accumulation of TPT in tumor, and the relative tumor uptake ratios were 3.4 and 4.3 compared with free drug, respectively. There was also a marked increase in the distribution of TPT in lung when the drug was encapsulated into H-Lip and H-PEG. Moreover, H-PEG decreased the accumulation of TPT in bore marrow compared with unmodified H-Lip. All these results indicated that the membrane fluidity of liposome has an important effect on in vitro stability and in vivo biodistribution pattern of liposomes containing TPT, and PEG-modified 'solid' liposome may be an efficient carrier of TPT.

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