KMID : 0043320110340060941
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Archives of Pharmacal Research 2011 Volume.34 No. 6 p.941 ~ p.948
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Encapsulation, pharmacokinetics and tissue distribution of interferon ¥á-2b liposomes after intramuscular injection to rats
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Li Hao
Yang Li Cheng Gang Wei Hong Yan Zeng Qun
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Abstract
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The aim of the present study was to investigate the effect of liposome-encapsulation and liposome-size on the in vivo pharmacokinetics of interferon ¥á-2b (IFN¥á-2b) following i.m. administration to rats, and whether there was any liver-targeting of these liposomes. Since liposomes of different sizes can be obtained by homogenization, the effect of homogenization on the IFN¥á-2b activity was also investigated. The pharmacokinetics of IFN¥á-2b solution (12.8 ¥ìg/kg) and IFN¥á-2b prepared in liposomes, including three mean sizes of 172 nm (12.2¥ìg/kg), 113 nm (44.2, 11.0, and 2.8¥ìg/kg, respectively), and 82 nm (13.1 ¥ìg/kg), were studied after a single i.m. dose to rats. Compared to a solution of IFN¥á-2b. administration of liposomal IFN¥á-2b resulted in a significantly prolonged tmax, the apparent elimination half life (t1/2¥â) was 2.3 times longer, both AUC0-¡Ä and MRT0-¡Ä were also clearly enhanced and greater accumulation was obtained in the liver (p < 0.05). The AUC0-¡Ä increased proportionally to the administered dose of IFN¥á-2b liposomes. Moreover, the size of liposomes ranging from 82 nm to 172 nm had no significant difference on the pharmacokinetic behavior in vivo (p > 0.05). In sum, compared with the free form, IFN¥á-2b encapsulated in liposomes can alter strikingly the pharmacokinetics properties following i.m. injection and if a liposomal size ranging from 82 nm to 172 nm was used, consistent pharmacokinetic behaviors of IFN¥á-2b was exhibited. The liposomal formulation apparently targeted the liver, offering a potential advantage for hepatitis B treatment.
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KEYWORD
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IFN¥á-2b, Liposomes, Pharmacokinetics, Tissue distribution, Liposomal siz
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