Journal
PHARMACEUTICAL RESEARCH
Volume 31, Issue 8, Pages 1978-1988Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11095-014-1300-z
Keywords
Bioavailability; Drug resistance; Pharmacokinetics; Solid lipid nanoparticle; Vorinostat
Funding
- National Research Foundation of Korea (NRF) grant - Ministry of Education, Science and Technology [2012R1A2A2A02044997, 2012R1A1A1039059]
- National Research Foundation of Korea [2012R1A2A2A02044997, 2012R1A1A1039059] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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To investigate whether delivery of a histone deacetylase inhibitor, vorinostat (VOR), by using solid lipid nanoparticles (SLNs) enhanced its bioavailability and effects on multidrug-resistant cancer cells. VOR-loaded SLNs (VOR-SLNs) were prepared by hot homogenization using an emulsification-sonication technique, and the formulation parameters were optimized. The cytotoxicity of the optimized formulation was evaluated in cancer cell lines (MCF-7, A549, and MDA-MB-231), and pharmacokinetic parameters were examined following oral and intravenous (IV) administration to rats. VOR-SLNs were spherical, with a narrowly distributed average size of similar to 100 nm, and were physically stable for 3 months. Drug release showed a typical bi-phasic pattern in vitro, and was independent of pH. VOR-SLNs were more cytotoxic than the free drug in both sensitive (MCF-7 and A549) and resistant (MDA-MB-231) cancer cells. Importantly, SLN formulations showed prominent cytotoxicity in MDA-MB-231 cells at low doses, suggesting an ability to effectively counter the P-glycoprotein-related drug efflux pumps. Pharmacokinetic studies clearly demonstrated that VOR-SLNs markedly improved VOR plasma circulation time and decreased its elimination rate constant. The areas under the VOR concentration-time curve produced by oral and IV administration of VOR-SLNs were significantly greater than those produced by free drug administration. These in vivo results clearly highlighted the remarkable potential of SLNs to augment the bioavailability of VOR. VOR-SLNs successfully enhanced the oral bioavailability, circulation half-life, and chemotherapeutic potential of VOR.
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