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Uptake and efflux of FL118 and two FL118 derivatives in 3D cell model

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Abstract

Drug uptake and efflux are two of the critical factors required in order to be able to define drug efficacy. This study aims to investigate cytotoxicity and uptake mechanisms of two FL118 analogues (7-Q20 and val-FL118) in parallel with FL118 in three-dimensional multi-cellular spheroids model. The influence of compound concentration, time, temperature, cell lines, and the inhibitors of P-gp, BCRP and LAT1 on drug uptake and efflux were investigated. In vitro cytotoxicity studies revealed that FL118, 7-Q20 and val-FL118 exhibited sensitive cytotoxicity to the HCT-116 cell line and the water-soluble compound 7-Q20 showed the lowest IC50. Cellular uptake and efflux of FL118 was independent of efflux pump proteins. Uptake and efflux of 7-Q20 were affected by P-gp, which was one of reasons that caused a lower uptake at 37 °C than at 4 °C. The carrier protein LAT1 played a role in the cellular intakes of val-FL118. These findings provided basic information for FL118 and the two novel FL118 derivatives for further development.

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Abbreviations

FL118:

10,11-Methylenedioxy-20(S)-camptothecin

7-Q20:

7-p-Trifluoromethylphenyl-10,11-methylenedioxy-20(S)-camptothecin

val-FL118:

10,11-Methylenedioxy-20 (S)-valine-camptothecin

MTT:

3-[4,5-Dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide

3D:

Three dimension

P-gp:

P-glycoprotein

BCRP:

Breast cancer resistant protein

LAT1:

L-type amino acid transporter 1

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Acknowledgements

We thank Ms. Amanda Hess for editorial proofreading of the manuscript before submission and final publication.

Funding

This work was financially supported by Qianjiang Talents Project in Zhejiang Province.

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Authors

Contributions

All authors contributed to the study conception and design. Material preparation was performed by YZ and YZ, theoretical advice was provided by QL and FL, data collection and analysis were performed by LZ and QW. The first draft of the manuscript was written by LZ. All authors read and approved the final manuscript.

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Correspondence to Qingyong Li.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Zhou, L., Weng, Q., Zheng, Y. et al. Uptake and efflux of FL118 and two FL118 derivatives in 3D cell model. Cytotechnology 71, 785–795 (2019). https://doi.org/10.1007/s10616-019-00322-5

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  • DOI: https://doi.org/10.1007/s10616-019-00322-5

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