Cited by 62Drug Transport and Resistance MechanismsPeroxisome Proliferator-Activated ReceptorsBarrier Structure and Function Studies

PPAR-α, a Lipid-Sensing Transcription Factor, Regulates Blood-Brain Barrier Efflux Transporter Expression

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More, Vijay R, Campos, Christopher R, Evans, Rebecca A, Oliver, Keith D, Chan, Gary NY, Miller, David S, Cannon, Ronald E·2017·Journal of Cerebral Blood Flow & Metabolism

Abstract

Lipid sensor peroxisome proliferator-activated receptor alpha (PPAR- α) is the master regulator of lipid metabolism. Dietary release of endogenous free fatty acids, fibrates, and certain persistent environmental pollutants, e.g. perfluoroalkyl fire-fighting foam components, are peroxisome proliferator-activated receptor alpha ligands. Here, we define a role for peroxisome proliferator-activated receptor alpha in regulating the expression of three ATP-driven drug efflux transporters at the rat and mouse blood-brain barriers: P-glycoprotein (Abcb1), breast cancer resistance protein (Bcrp/Abcg2), and multidrug resistance-associated protein 2 (Mrp2/Abcc2). Exposing isolated rat brain capillaries to linoleic acid, clofibrate, or PKAs increased the transport activity and protein expression of the three ABC transporters. These effects were blocked by the PPAR- α antagonist, GW6471. Dosing rats with 20 mg/kg or 200 mg/kg of clofibrate decreased the brain accumulation of the P-glycoprotein substrate, verapamil, by 50% (in situ brain perfusion; effects blocked by GW6471) and increased P-glycoprotein expression and activity in capillaries ex vivo. Fasting C57Bl/6 wild-type mice for 24 h increased both serum lipids and brain capillary P-glycoprotein transport activity. Fasting did not alter P-glycoprotein activity in PPAR- α knockout mice. These results indicate that hyperlipidemia, lipid-lowering fibrates and exposure to certain fire-fighting foam components activate blood-brain barrier peroxisome proliferator-activated receptor alpha, increase drug efflux transporter expression and reduce drug delivery to the brain.

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Crossref · 10.1177/0271678x16650216

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  • A 2017 study using rats and mice found that PPARα agonists, including PFOS and PFNA, increased the expression and activity of these efflux transporters.

    “A study from 2017 using rats and mice found that PPARα agonists, including PFOS and PFNA, increased the expression and activity of these efflux transporters.”

    From A Critical Review and Meta-Analysis of Impacts of Per- and Polyfluorinated Substances on the Brain and Behavior (2022) · cites this paper as More et al., 2017

    The Results (page unavailable) show that PFOS and PFNA increased efflux-transporter activity in isolated rat brain capillaries, with effects varying by PFOS concentration. They do not report transporter-expression measurements for PFOS or PFNA, or tests of those compounds in mice; the mouse experiments used fasting. The cited paper is identified as a 2016 study, not a 2017 study. (LLM, conf=0.88)

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  • PFAS exposure may have important implications for the treatment of certain ailments, such as brain cancer, epilepsy, and depression, through restriction of drug delivery.

    “PFAS exposure may have important implications for the treatment of certain ailments, such as brain cancer, epilepsy, and depression (More et al., 2017; Kirk et al., 2021), through restriction of drug delivery.”

    From A Critical Review and Meta-Analysis of Impacts of Per- and Polyfluorinated Substances on the Brain and Behavior (2022) · cites this paper as More et al., 2017

    The Results report that PFOS and PFNA increased drug-efflux transport in isolated rat brain capillaries, and the Discussion suggests this could restrict CNS drug delivery in humans. The paper does not specifically address treatment of brain cancer, epilepsy, or depression, so the disease-specific implications are not established by this source. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • PPARα is expressed at the BBB where it controls the expression of ATP-driven drug efflux transporters, such as P-glycoprotein, breast cancer resistance protein, and multidrug resistance-associated protein.

    “PPARα is expressed at the BBB where it controls the expression of ATP-driven drug efflux transporters, such as P-glycoprotein (Abcb1), breast cancer resistance protein (Bcrp/Abcg2), and multidrug resistance-associated protein (Mrp2/Abcc2) (More et al., 2017).”

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Authors
More, V. R., Campos, C. R., Evans, R. A., Oliver, K. D., Chan, G. N., Miller, D. S., & Cannon, R. E.
Affiliations
National Institutes of Health (US)
Corresponding author
Cannon, Ronald E
Venue
Journal of Cerebral Blood Flow & Metabolism
Published
2016-07-21
Volume
37
Issue
4
Pages
1199-1212
ISSN
  • 0271-678X (ISSN-L)
  • 1559-7016
OpenAlex
W2398366925
Cited by
59
References
49
Citations by year
2026: 2 · 2025: 5 · 2024: 8 · 2023: 10 · 2022: 5 · 2021: 11 · 2020: 7 · 2019: 6 · 2018: 3 · 2016: 2
FWCI
1.97
Type
journal article
Language
en
Open access
Locations
  • Journal of Cerebral Blood Flow & Metabolism (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
Keywords
PPARα, blood-brain barrier, efflux pumps, P-glycoprotein, ABCG2, MRP2, ABC transporters, clofibrate, linoleic acid, perfluorinated compounds, hyperlipidemia, fasting, verapamil, brain capillaries, GW6471, lipid metabolism, brain drug delivery
MeSH terms
ATP Binding Cassette Transporter, Subfamily G, Member 2, Multidrug Resistance-Associated Protein 2, Animals, Biological Transport, Blood-Brain Barrier, Brain, Capillaries, Clofibrate, Fasting, Fluorocarbons, Gene Expression Regulation, Male, Mice, Inbred C57BL, Oxazoles, Tyrosine, Rats, Sprague-Dawley, Alkanesulfonic Acids, Mice, Knockout, ATP-Binding Cassette Transporters, Linoleic Acid, ATP Binding Cassette Transporter, Subfamily B, Member 1, ATP-Binding Cassette, Sub-Family C Proteins, PPAR alpha

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