Abstract
Purpose
Since the vitamin D receptor (VDR) was found to up-regulate cerebral P-glycoprotein expression in vitro and in mice, we extend our findings to rats by assessing the effect of rat Vdr activation on brain efflux of quinidine, a P-gp substrate that is eliminated primarily by cytochrome P450 3a.
Methods
We treated rats with vehicle or the active VDR ligand, 1α,25-dihydroxyvitamin D3 [1,25(OH)2D3] (4.8 or 6.4 nmol/kg i.p. every 2nd day ×4) and examined P-gp expression and cerebral quinidine disposition via microdialysis in control and treatment studies conducted longitudinally in the same rat.
Results
The 6.4 nmol/kg 1,25(OH)2D3 dose increased cerebral P-gp expression 1.75-fold whereas hepatic Cyp3a remained unchanged. Although there was no change in systemic clearance elicited by 1,25(OH)2D3, brain extracellular fluid quinidine concentrations were lower in treated rats. We noted that insertion of indwelling catheters increased plasma protein binding of quinidine and serial sampling decreased the blood:plasma concentration ratio, factors that alter distribution ratios in microdialysis studies. After appropriate correction, KECF/P,uu and KECF/B,uu, or ratios of quinidine unbound concentrations in brain extracellular fluid to plasma or blood at steady-state, were more than halved.
Conclusion
We demonstrate that VDR activation increases cerebral P-gp expression and delimits brain penetration of P-gp substrates.
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Abbreviations
- 1,25(OH)2D3 :
-
1α,25-dihydroxyvitamin D3
- aCSF:
-
Artificial cerebrospinal fluid
- BBB:
-
Blood–brain barrier
- Bcrp/BCRP:
-
Rodent/human breast cancer resistance protein
- CAR:
-
Constitutive androstane receptor
- CNS:
-
Central nervous system
- Cyp:
-
Rodent cytochrome P450
- ECF:
-
Extracellular fluid
- Gapdh:
-
Glyceraldehyde 3-phosphate dehydrogenase
- GR:
-
Glucocorticoid receptor
- Mdr1/MDR1:
-
Rodent/human multidrug resistance protein 1
- Mrp/MRP:
-
Rodent/human multidrug resistance-associated protein
- NR:
-
Nuclear receptors
- PBS:
-
Phosphate-buffered saline
- P-gp:
-
P-glycoprotein
- PMSF:
-
Phenylmethylsulfonyl fluoride
- PXR:
-
Pregnane X receptor
- qPCR:
-
Quantitative real-time polymerase chain reaction
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- Vdr/VDR:
-
Rodent/human vitamin D receptor
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ACKNOWLEDGMENTS AND DISCLOSURES
The authors have no conflict of interest to declare. This work was supported by the Canadian Institutes of Health Research (CIHR) and by NoAb BioDiscoveries (NoAb) and InterVivo Solutions (IVS). Matthew R. Durk was supported by a CIHR Strategic Training Grant in Biological Therapeutics and a Pfizer Canada Graduate Scholarship in Science and Technology. Additionally, we wish to thank employees of IVS, Sophie Pan and Julia Izhakova, for the bioanalysis of the microsomal, protein binding and blood; plasma ratio study samples and Victor Saldivia for carrying out the blood: plasma ratio studies. David K. H. Lee (NoAb and IVS) is thanked for approval of our collaborative efforts.
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MRD and JF contributed equally as first authors and K. Sandy Pang and Inés A.M. de Lannoy are equal co-senior authors
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Durk, M.R., Fan, J., Sun, H. et al. Vitamin D Receptor Activation Induces P-Glycoprotein and Increases Brain Efflux of Quinidine:An Intracerebral Microdialysis Study in Conscious Rats. Pharm Res 32, 1128–1140 (2015). https://doi.org/10.1007/s11095-014-1524-y
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DOI: https://doi.org/10.1007/s11095-014-1524-y