Abstract
Purpose
To investigate whether it is possible to specifically suppress the expression and function of endogenous canine P-glycoprotein (cPgp) in Madin-Darby canine kidney type II cells (MDCKII) transfected with hPGP and breast cancer resistance protein (hBCRP) by zinc finger nuclease (ZFN) producing sequence specific DNA double strand breaks.
Methods
Wild-type, hPGP-transfected, and hBCRP-transfected MDCKII cells were transfected with ZFN targeting for cPgp. Net efflux ratios (NER) of Pgp and Bcrp substrates were determined by dividing efflux ratios (basal-to-apical / apical-to-basal) in over-expressing cell monolayers by those in wild-type ones.
Results
From ZFN-transfected cells, cell populations (ko-cells) showing knockout of cPgp were selected based on genotyping by PCR. qRT-PCR analysis showed the significant knock-downs of cPgp and interestingly also cMrp2 expressions. Specific knock-downs of protein expression for cPgp were shown by western blotting and quantitative targeted absolute proteomics. Endogenous canine Bcrp proteins were not detected. For PGP-transfected cells, NERs of 5 Pgp substrates in ko-cells were significantly greater than those in parental cells not transfected with ZFN. Similar result was obtained for BCRP-transfected cells with a dual Pgp and Bcrp substrate.
Conclusion
Specific efflux mediated by hPGP or hBCRP can be determined with MDCKII cells where cPgp has been knocked out by ZFN.
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Abbreviations
- A-B:
-
Apical-to-basal
- ABC–transporters:
-
ATP-binding cassette transporters
- B-A:
-
Basal-to-apical
- cBcrp:
-
Canine breast cancer resistance protein
- cMrp:
-
Canine multidrug resistance-associated protein
- cPgp:
-
Canine p-glycoprotein
- ER:
-
Efflux ratio
- hBCRP:
-
Human breast cancer resistance protein
- hPGP:
-
Human p-glycoprotein
- ko-cell:
-
cPgp knockout cell
- LC-MS/MS:
-
Liquid chromatography-tandem mass spectrometry
- LQ:
-
The limit of quantification
- MDCKII:
-
Madin-Darby canine kidney type II cell line
- NER:
-
Net efflux ratio
- QTAP:
-
Quantitative targeted absolute proteomics
- SRM:
-
Selected reaction monitoring
- ULQ:
-
Under the limit of quantification
- ZFN:
-
Zinc finger nuclease
- ZFP:
-
Zinc finger protein
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ACKNOWLEDGMENTS AND DISCLOSURES
The authors would like to thank Dr. Axel Meyer for his suggestions on how to construct the zinc finger nucleases.
Tetsuya Terasaki is a full professor at Tohoku University, and is also a director of Proteomedix Frontiers Co. Ltd. This study was not supported by Proteomedix Frontiers Co. Ltd., and his position at Proteomedix Frontiers Co. Ltd. did not affect the design of the study, the collection of the data, the analysis or interpretation of the data, the decision to submit the manuscript for publication, or the writing of the manuscript and did not present any financial conflicts. The other authors declare no competing interests.
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Gartzke, D., Delzer, J., Laplanche, L. et al. Genomic Knockout of Endogenous Canine P-Glycoprotein in Wild-Type, Human P-Glycoprotein and Human BCRP Transfected MDCKII Cell Lines by Zinc Finger Nucleases. Pharm Res 32, 2060–2071 (2015). https://doi.org/10.1007/s11095-014-1599-5
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DOI: https://doi.org/10.1007/s11095-014-1599-5