Effect of TRX-Liposomes Size on Their Prolonged Circulation in Rats

概要

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Newly formulated cationic liposomes (TRX-liposomes) with four different mean diameters were injected into twelve male rats via the lateral tail vein in order to evaluate the effect of liposomal size on pharmacokinetic parameters. TRX-liposomes disappeared from the blood according to the one-compartment model and demonstrated maximum and minimum half-lives of ca. 14 h (mean diameter of 114.3 nm) and ca. 5 h (mean diameter of 285.9 nm), respectively. This prolonged half-life tended to decrease at the boundary of 114.3nm mean diameter. The optimal size (114.3nm) for prolonged circulation of TRX-liposomes was consistent with that of pegylated liposomes such as Doxil[○!R], however, the half-life was different among these liposomes. The electric charge of the TRX-liposomal surface is assumed to be responsible for this difference. The results of the present study will be very useful in the design of long-circulating cationic liposomes.
公益社団法人日本薬学会の論文
2003-03-01