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• W2045268646 abstract "8-Chloro-adenosine (8CA) has shown promise in hematologic and solid tumor models and is in a phase I clinical trial. However, 8CA is intensively metabolized shortly after i.v. administration, with a t1/2β of approximately 1 h. Many carriers have failed to encapsulate 8CA efficiently. To improve its pharmacokinetic properties, 8-chloro-adenosine-5′-O-stearate (8CAS), a lipophilic octadecanoyl analogue of 8CA, was synthesized and incorporated into pegylated liposomes. The liposomes, comprising egg phosphatidylcholine, cholesterol and poly (ethylene glycol) 2000-distearoyl phosphatidylethanolamine (PEG-DSPE), had mean diameters of approximately 100 nm and an entrapment efficiency of 69–86%. MTT assays showed that the cytotoxicity of 8CAS and its pegylated liposomes (8CAS-PL) were retained, with IC50 values of 1.0 μM and 1.9 μM at 72 h on MCF-7 cells, respectively, slightly higher than that of 8CA (0.6 μM). Pharmacokinetic studies in rats after i.v. injection showed that both 8CAS and 8CAS-PL had increased elimination half-lives (t1/2, 128.4, 249.2 vs. 74.7 min), decreased clearance rates (Cl, 0.0135, 0.00875 vs. 0.2398 L/min/kg) and increased area under the concentration–time curve (AUC0−∞, 741.4, 1163.6 vs. 42.0 mg min/L) compared to 8CA. No obvious hematological toxicity was seen for Kunming mice receiving i.v. 8CA or 8CAS-PL at a dosage of 10 mg/kg daily. These results indicate that the lipophilic derivation of 8CA and the incorporation of 8CAS is an effective strategy to improve the bioavailability of 8CA." @default.
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• W2045268646 date "2013-01-01" @default.
• W2045268646 modified "2023-10-17" @default.
• W2045268646 title "A novel approach to improve the pharmacokinetic properties of 8-chloro-adenosine by the dual combination of lipophilic derivatisation and liposome formulation" @default.
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• W2045268646 doi "https://doi.org/10.1016/j.ejps.2012.10.026" @default.
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