In vitro: Polyoxyethylene stearate has been recommended as an additive to the radiolabelled 7H12 Middlebrook TB media and as such has been shown to enhance growth of mycobacteria in the radiometric BACTEC rapid culture system. Polyoxyethylene (50) stearate produces the greatest enhancement in growth and reduction in the time taken to detect growth for M. tuberculosis and polyoxyethylene (30) stearate and polyoxyethylene (JL) stearate for species of mycobacteria other than M. tuberculosis. Polyoxyethylene stearate inhibits P-gp mediated efflux in a concentration dependent manner mainly by modulating substrate-stimulated P-gp ATPase activity. Polyoxyethylene 40 stearate reduces vinblastine sulfate efllux. The cytotoxicity of vinblastine to K562/ADR cells is significantly enhanced when the cells are cotreated with 100 or 150 μg/mL polyoxyethylene 40 stearate. In vivo: Polyoxyethylene stearate is potentially useful as a pharmaceutical ingredient to improve the oral bioavailability of coadministered P-gp substrates and substrates for certain CYP isoforms. The average tumor volume and average tumor weight are significantly less in the polyoxyethylene 40 stearate + vinblastine group. The inhibition rate for tumor growth is increased from 0.06 (vinblastine group) to 0.84 (vinblastine+polyoxyethylene 40 stearate group).
|Cell lines||Caco-2 cell line|
|Preparation method||Donor solutions of 200 ug/mL VBL with or without different concentrations of PS40 in TBS were added to the donor compartment. The nal concentrations of PS40 were 50, 100, and 150 ug/mL. The AP compartment and the BL compartment served as the donor compartments for absorptive (AP-BL) and ef ux (BL-AP) transport, respectively.|
|Concentrations||50, 100, and 150 ug/mL.|
|Incubation time||20, 40, 60, 90, 120, and 150 minutes|
|Animal models||Female BALB/c-nu/nu mice|
|Formulation||0.9% sodium chloride solution|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
|Solubility||10mM in DMSO|
Systemic delivery of alpha-asarone with Kolliphor HS 15 improves its safety and therapeutic effect on asthma.
Lu H, et al. Drug Deliv. 2015 May;22(3):266-75. PMID: 24580506.
Polyoxyethylene 40 stearate modulates multidrug resistance and enhances antitumor activity of vinblastine sulfate.
Luo L, et al. AAPS J. 2007 Oct 5;9(3):E329-35. PMID: 18170979.
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