ABSTRACT
Purpose
To determine the influence of drug physicochemical properties on brain mitochondrial delivery of 20 drugs at physiological pH.
Methods
The delivery of 8 cationic drugs (beta-blockers), 6 neutral drugs (corticosteroids), and 6 anionic drugs (non-steroidal anti-inflammatory drugs, NSAIDs) to isolated rat brain mitochondria was determined with and without membrane depolarization. Multiple linear regression was used to determine whether lipophilicity (Log D), charge, polarizability, polar surface area (PSA), and molecular weight influence mitochondrial delivery.
Results
The Log D for beta-blockers, corticosteroids, and NSAIDs was in the range of −1.41 to 1.37, 0.72 to 2.97, and −0.98 to 2, respectively. The % mitochondrial uptake increased exponentially with an increase in Log D for each class of drugs, with the uptake at a given lipophilicity obeying the rank order cationic>anionic>neutral. Valinomycin reduced membrane potential and the delivery of positively charged propranolol and betaxolol. The best equation for the combined data set was Log % Uptake = 0.333 Log D + 0.157 Charge – 0.887 Log PSA + 2.032 (R2 = 0.738).
Conclusions
Drug lipopohilicity, charge, and polar surface area and membrane potential influence mitochondrial drug delivery, with the uptake of positively charged, lipophilic molecules being the most efficient.
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Abbreviations
- CNPase:
-
2′ 3′-cyclic nucleotide 3′-phosphodiesterase
- EDTA:
-
ethylenediaminetetraacetic acid
- F:
-
explained variance/unexplained variance
- FL2/FL1:
-
590 nm emission/525 nm emission
- LC-MS/MS:
-
liquid chromatography tandem mass spectrometry
- LDH:
-
lactate dehydrogenase
- Log D:
-
Log distribution coefficient
- Log P:
-
Log partition coefficient
- MW:
-
molecular weight
- N:
-
number of molecules
- NSAIDs:
-
non-steroidal anti-inflammatory drugs
- PBS:
-
phosphate-buffered saline
- pKa:
-
acid dissociation constant
- PSA:
-
polar surface area
- Q:
-
charge
- R2 :
-
amount of variance in dependent variable that is explained by model
- SD:
-
standard deviation
- SE:
-
standard error of the estimate
- α:
-
polarizability
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ACKNOWLEDGMENTS & DISCLOSURES
This work was supported in part by the NIH grants R01EY018940 (UBK), R01EY017533 (UBK), R01NS45748 (MP) and R01NS039587 (MP).
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Supplemental Figure 1
NSAID chromatogram containing a mixture of 5 μg/ml of each NSAID. Peaks: (1) indoprofen; (2) naproxen; (3) tolmetin; (4) ketoprofen; (5) flurbiprofen; (6) diclofenac; (7) mefenamic acid. (PDF 412 kb)
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Durazo, S.A., Kadam, R.S., Drechsel, D. et al. Brain Mitochondrial Drug Delivery: Influence of Drug Physicochemical Properties. Pharm Res 28, 2833–2847 (2011). https://doi.org/10.1007/s11095-011-0532-4
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DOI: https://doi.org/10.1007/s11095-011-0532-4