Abstract
Camptothecin-based drugs, because of their poor solubility and labile lactone ring, pose challenges for drug delivery. The purpose of this research was to develop a nanoparticle delivery system for camptotheca alkaloids. After initial investigations SN-38 was selected as the candidate camptotheca alkaloid for further development. Nanoparticles comprising SN-38, phospholipids and polyethylene glycol were developed and studied in vitro and in vivo. The SN-38 formulations were stable in human serum albumin and high lactone concentrations were observed even after 3 h. In vivo studies in nude mice showed prolonged half-life of the active (lactone form) drug in whole blood and increased efficacy compared to Camptosar in a mouse xenograft tumor model.
MeSH terms
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Animals
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Antineoplastic Agents, Phytogenic / administration & dosage
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Antineoplastic Agents, Phytogenic / blood
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Antineoplastic Agents, Phytogenic / pharmacokinetics
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Body Weight / drug effects
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Body Weight / physiology
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Camptothecin / administration & dosage
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Camptothecin / analogs & derivatives*
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Camptothecin / blood
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Camptothecin / pharmacokinetics
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Drug Delivery Systems
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Enzyme Inhibitors / administration & dosage*
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Enzyme Inhibitors / blood
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Enzyme Inhibitors / pharmacokinetics*
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HT29 Cells
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Half-Life
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Humans
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Injections, Intravenous
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Irinotecan
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Lactones / chemistry
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Light
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Mice
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Mice, Nude
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Microspheres
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Neoplasm Transplantation
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Particle Size
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Scattering, Radiation
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Serum Albumin / chemistry
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Topoisomerase Inhibitors*
Substances
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Antineoplastic Agents, Phytogenic
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Enzyme Inhibitors
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Lactones
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Serum Albumin
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Topoisomerase Inhibitors
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Irinotecan
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Camptothecin