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Cytotoxicity of Endocytosis and Efflux Inhibitors in the BeWo Cell Line
Mansi Shah1, Luke Bourner2, Shariq Ali2
1Department of Obstetrics and Gynecology, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, USA.
Aims:
The purpose of this study was to determine the cell viability and cytotoxicity of various endocytosis and efflux inhibitors which can be used to determine transport and uptake mechanisms in the BeWo (b30 clone) human placental trophoblast cell line. Ethanol and dimethylsulfoxide (DMSO) were also studied since they are often used as cosolvents for administration of these inhibitors.
Methodology:
The water-soluble tetrazolium-1 (WST-1) assay was used to quantify cell viability and the lactate dehydrogenase (LDH) assay was used to determine cytotoxicity.
Results:
By the WST-1 assay, reduced cell viability was observed following 4 hours of exposure to chlorpromazine (10 μg/mL), colchicine (1 mM), filipin (3 μg/mL), gentamicin (2 mM), GF120918 (1 μM), methyl-β-cyclodextrin (5 mM), and verapamil (100 μM). By the LDH assay, however, no cytotoxicity was observed after 4 hours of exposure to the aforementioned compounds. Amiloride (500 μM), ethanol (up to 0.1% v/v), and DMSO (up to 0.1% v/v) did not reduce cell viability nor induce cytotoxicity.
Conclusion:
This information is valuable when selecting potential inhibitors of endocytosis and efflux and the selection of time points for mechanistic studies.
Insights
Several endocytosis and efflux inhibitors reduced cell viability but did not cause cytotoxicity in BeWo cells after 4 hours. This data aids in selecting appropriate inhibitors for transport and uptake studies.
Area of Science:
- Pharmacology
- Cell Biology
- Drug Transport
Background:
- Understanding drug transport and uptake mechanisms is crucial for placental drug delivery.
- BeWo cells are a valuable model for studying placental trophoblast function.
- Endocytosis and efflux inhibitors are essential tools for elucidating transport pathways.
Purpose of the Study:
- To assess the impact of common endocytosis and efflux inhibitors on BeWo cell viability and cytotoxicity.
- To evaluate the safety of ethanol and dimethylsulfoxide (DMSO) as cosolvents for these inhibitors.
- To provide data for selecting appropriate inhibitors and experimental time points for mechanistic studies.
Main Methods:
- Cell viability was quantified using the water-soluble tetrazolium-1 (WST-1) assay.
- Cytotoxicity was determined by measuring lactate dehydrogenase (LDH) release.
- BeWo (b30 clone) human placental trophoblast cells were exposed to various inhibitors for 4 hours.
Main Results:
- Chlorpromazine, colchicine, filipin, gentamicin, GF120918, methyl-β-cyclodextrin, and verapamil reduced cell viability.
- No significant cytotoxicity was observed with these compounds at the tested concentrations and time point.
- Amiloride, ethanol, and DMSO did not affect cell viability or induce cytotoxicity.
Conclusions:
- Specific endocytosis and efflux inhibitors can be used in BeWo cells without causing overt cytotoxicity within a 4-hour window.
- The findings support the use of these inhibitors for mechanistic studies of transport and uptake.
- Careful selection of inhibitors and exposure times is recommended for accurate results.
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