Investigation of solvents that can be used as vehicles to evaluate poorly soluble compounds in short-term oral toxicity studies in rats

In non-clinical toxicity studies of orally dosed small molecule drugs, methyl cellulose (MC) is commonly used as the vehicle. It is well tolerated and easy to prepare. However, it is not suitable as the vehicle for all poorly soluble compounds. The objective of this study was to evaluate the no-obse...

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Published inFundamental Toxicological Sciences Vol. 11; no. 2; pp. 69 - 78
Main Authors Ikeda, Keigo, Kochi, Mami, Tochitani, Tomoaki, Umeya, Naohisa, Matsumoto, Izumi, Fujii, Yuta, Usui, Toru, Miyawaki, Izuru
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Published The Japanese Society of Toxicology 2024
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Abstract In non-clinical toxicity studies of orally dosed small molecule drugs, methyl cellulose (MC) is commonly used as the vehicle. It is well tolerated and easy to prepare. However, it is not suitable as the vehicle for all poorly soluble compounds. The objective of this study was to evaluate the no-observed-effect levels (NOELs) of solvents that are possible alternative vehicles for 2-week oral administration of poorly soluble drugs. Five animals/group were dosed once daily with 25 mg/kg/day MC 400 (0.5% MC, control group), up to 5,000 mg/kg/day of polyethylene glycol 400 (PEG 400), 5,500 mg/kg/day of dimethyl sulfoxide (DMSO), 1,000 mg/kg/day of hydroxypropyl-β-cyclodextrin (HP-β-CD), 250 mg/kg/day of polysorbate 80 (Tween 80), 600 mg/kg/day of sodium dodecyl sulfate (SDS), 9,000 mg/kg/day of olive oil and sesame oil, and 600 mg/kg/day of lactic acid. Parameters evaluated included clinical signs, clinical pathology, organ weight, gross pathology, and histopathology. The NOELs were considered to be 1,250 mg/kg/day for PEG 400, 1,000 mg/kg/day for HP-β-CD, 250 mg/kg/day for Tween 80, 4,500 mg/kg/day for olive oil, 4,500 mg/kg/day for sesame oil, and 600 mg/kg/day for lactic acid. The NOELs of DMSO and SDS could not be determined, because rats dosed with DMSO or SDS showed DMSO-specific offensive odor or SDS-related significant irritant effects even at the lowest dose levels (DMSO, 1,100 mg/kg/day; SDS, 150 mg/kg/day). This study provides the NOELs of several solvents that could be used as vehicles in 2-week oral toxicity studies in rats.
AbstractList In non-clinical toxicity studies of orally dosed small molecule drugs, methyl cellulose (MC) is commonly used as the vehicle. It is well tolerated and easy to prepare. However, it is not suitable as the vehicle for all poorly soluble compounds. The objective of this study was to evaluate the no-observed-effect levels (NOELs) of solvents that are possible alternative vehicles for 2-week oral administration of poorly soluble drugs. Five animals/group were dosed once daily with 25 mg/kg/day MC 400 (0.5% MC, control group), up to 5,000 mg/kg/day of polyethylene glycol 400 (PEG 400), 5,500 mg/kg/day of dimethyl sulfoxide (DMSO), 1,000 mg/kg/day of hydroxypropyl-β-cyclodextrin (HP-β-CD), 250 mg/kg/day of polysorbate 80 (Tween 80), 600 mg/kg/day of sodium dodecyl sulfate (SDS), 9,000 mg/kg/day of olive oil and sesame oil, and 600 mg/kg/day of lactic acid. Parameters evaluated included clinical signs, clinical pathology, organ weight, gross pathology, and histopathology. The NOELs were considered to be 1,250 mg/kg/day for PEG 400, 1,000 mg/kg/day for HP-β-CD, 250 mg/kg/day for Tween 80, 4,500 mg/kg/day for olive oil, 4,500 mg/kg/day for sesame oil, and 600 mg/kg/day for lactic acid. The NOELs of DMSO and SDS could not be determined, because rats dosed with DMSO or SDS showed DMSO-specific offensive odor or SDS-related significant irritant effects even at the lowest dose levels (DMSO, 1,100 mg/kg/day; SDS, 150 mg/kg/day). This study provides the NOELs of several solvents that could be used as vehicles in 2-week oral toxicity studies in rats.
Author Ikeda, Keigo
Kochi, Mami
Tochitani, Tomoaki
Umeya, Naohisa
Fujii, Yuta
Matsumoto, Izumi
Usui, Toru
Miyawaki, Izuru
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Title Investigation of solvents that can be used as vehicles to evaluate poorly soluble compounds in short-term oral toxicity studies in rats
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