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Brukner AM, Billington S, Benifla M, Nguyen TB, Han H, Bennett O, Gilboa T, Blatch D, Fellig Y, Volkov O, Unadkat JD, Ekstein D, Eyal S. Abundance of P-glycoprotein and Breast Cancer Resistance Protein Measured by Targeted Proteomics in Human Epileptogenic Brain Tissue. Mol Pharm 2021; 18:2263-2273. [PMID: 34008992 PMCID: PMC8488956 DOI: 10.1021/acs.molpharmaceut.1c00083] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
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Our goal was to measure the absolute
differential abundance of
key drug transporters in human epileptogenic brain tissue and to compare
them between patients and at various distances from the epileptogenic
zone within the same patient. Transporter protein abundance was quantified
in brain tissue homogenates from patients who underwent epilepsy surgery,
using targeted proteomics, and correlations with clinical and tissue
characteristics were assessed. Fourteen brain samples (including four
epileptogenic hippocampal samples) were collected from nine patients.
Among the quantifiable drug transporters, the abundance (median, range)
ranked: breast cancer resistance protein (ABCG2/BCRP; 0.55, 0.01–3.26
pmol/g tissue) > P-glycoprotein (ABCB1/MDR1; 0.30,
0.02–1.15 pmol/g tissue) > equilibrative nucleoside transporter
1 (SLC29A1/ENT1; 0.06, 0.001–0.35 pmol/g tissue). The ABCB1/ABCG2
ratio (mean 0.27, range 0.08–0.47) was comparable with literature
values from nonepileptogenic brain tissue (mean 0.5–0.8). Transporter
abundance was lower in the hippocampi than in the less epileptogenic
neocortex of the same patients. ABCG2/BCRP and ABCB1/MDR1 expression
strongly correlated with that of glucose transporter 1 (SLC2A1/GLUT1)
(r = 0.97, p < 0.001; r = 0.90, p < 0.01, respectively). Low
transporter abundance was found in patients with overt vascular pathology,
whereas the highest abundance was seen in a sample with normally appearing
blood vessels. In conclusion, drug transporter abundance highly varies
across patients and between epileptogenic and less epileptogenic brain
tissue of the same patient. The strong correlation in abundance of
ABCB1/MDR1, ABCG2/BCRP, and SLC2A1/GLUT1 suggests variation in the
content of the functional vasculature within the tissue samples. The
epileptogenic tissue can be depleted of key drug transport mechanisms,
warranting consideration when selecting treatments for patients with
drug-resistant epilepsy.
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Affiliation(s)
- Aniv Mann Brukner
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Room 613, Ein Kerem, Jerusalem 91120, Israel
| | - Sarah Billington
- Department of Pharmaceutics, School of Pharmacy, University of Washington, Seattle, Washington 98195, United States
| | - Mony Benifla
- Children's Neurosurgery Department, Rambam Academic Hospital, Haifa 31999, Israel
| | - Tot Bui Nguyen
- Department of Pharmaceutics, School of Pharmacy, University of Washington, Seattle, Washington 98195, United States
| | - Hadas Han
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Room 613, Ein Kerem, Jerusalem 91120, Israel
| | - Odeya Bennett
- Department of Pediatrics, Shaare Zedek Medical Center, Jerusalem 91031, Israel
| | - Tal Gilboa
- Neuropediatric Unit, Pediatrics Division, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel.,The Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Dana Blatch
- Department of Neurology, Agnes Ginges Center for Human Neurogenetics, Hadassah Medical Organization, Jerusalem 91120, Israel
| | - Yakov Fellig
- The Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel.,Department of Pathology, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel
| | - Olga Volkov
- Nuclear Medicine Institute, Sheba Medical Center, Tel Hashomer 52621, Israel
| | - Jashvant D Unadkat
- Department of Pharmaceutics, School of Pharmacy, University of Washington, Seattle, Washington 98195, United States
| | - Dana Ekstein
- The Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel.,Department of Neurology, Agnes Ginges Center for Human Neurogenetics, Hadassah Medical Organization, Jerusalem 91120, Israel
| | - Sara Eyal
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Room 613, Ein Kerem, Jerusalem 91120, Israel
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Mann Brukner A, Ben-Hur T, Honig A, Ekstein D, Eyal S. Effects of Valproic Acid on Cerebral Nutrient Carriers' Expression in the Rat. Front Pharmacol 2018; 9:1054. [PMID: 30298005 PMCID: PMC6160718 DOI: 10.3389/fphar.2018.01054] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 08/31/2018] [Indexed: 12/16/2022] Open
Abstract
Objective: The antiepileptic drug valproate has been shown to affect the expression of carriers for essential compounds and drugs in extracerebral tissues. The aim of the current study was to evaluate in vivo the effect of valproate treatment on the cerebral expression of carriers and selected genes of the blood-brain barrier (BBB) in the rat. Methods: Male Wistar rats were treated daily for 7 days by intraperitoneal injections of valproate (75, 150, or 300 mg/kg/day) or the vehicle. mRNA was isolated from the cerebral cortex and the hippocampus. Transcript levels of 37 genes were measured using a customized gene expression assay. Quantitative histone acetylation was evaluated by western blotting. Glucose6-phosphate (G6P) tissue levels were used as a surrogate of cerebral glucose concentrations. Results: Valproate treatment was associated with significant reduction (up to 22%; P < 0.05) in cortical and hippocampal claudin 5-normalized Slc2a1 (Glut1) mRNA expression. G6P levels were not significantly altered, but were correlated with Slc2a1 transcript levels (r = 0.499; P < 0.02). None of the other 36 screened genes were significantly affected by valproate. Cortical histone hyperacetylation indicated cerebral activity of valproate on a major pathway regulating gene expression (P < 0.02). Significance: The effect of valproate on nutrient carriers appears to be tissue-specific and even brain area-specific. If validated in humans, the changes in Glut1 expression might have clinical implications in positron emission tomography (PET) imaging. Further studies are required for elucidating the relevance of these findings to the clinic.
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Affiliation(s)
- Aniv Mann Brukner
- Transporter Laboratory, Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Tamir Ben-Hur
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Asaf Honig
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Dana Ekstein
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Sara Eyal
- Transporter Laboratory, Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem, Israel
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