Evidence map›Paper›PMID 33504784›Full record

ArticleNature communications2021

A circadian clock regulates efflux by the blood-brain barrier in mice and human cells.

Shirley L Zhang, Nicholas F Lahens, Zhifeng Yue, Denice M Arnold, Peter P Pakstis, Jessica E Schwarz, Amita Sehgal

Open access · goldAbstract read
In one paragraph

Article in Nature communications, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 95 papers.

0numbers the graph read from it
0cells of the map it votes in
95citing papers in PubMed
8.7field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

95 citing papers in PubMed, 131 citations in OpenAlex.

  1. Circadian Neurology.Continuum (Minneapolis, Minn.) · 2026
    Review
  2. Article
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  7. Article
  8. Article
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  12. Article
  13. Review
  14. Article
  15. Review
  16. Regulation of Metabolic Rhythms by Glial Clocks.Journal of biological rhythms · 2026
    Article
  17. Development of the blood-brain barrier.Development (Cambridge, England) · 2026
    Review
  18. Article
  19. Review
  20. Review

35 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 3 institutions in 1 country.

Shirley L ZhangChronobiology and Sleep Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. zhangshi@pennmedicine.upenn.edu.ORCID http://orcid.org/0000-0002-6672-2044
Nicholas F LahensInstitute for Translational Medicine and Therapeutics (ITMAT), Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.ORCID http://orcid.org/0000-0002-3965-5624
Zhifeng YueChronobiology and Sleep Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.
Denice M ArnoldChronobiology and Sleep Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.
Peter P PakstisChronobiology and Sleep Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.
Jessica E SchwarzChronobiology and Sleep Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.ORCID http://orcid.org/0000-0003-4831-225X
Amita SehgalChronobiology and Sleep Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. amita@pennmedicine.upenn.edu.ORCID http://orcid.org/0000-0001-7354-9641
Howard Hughes Medical Institute · USUniversity of Pennsylvania · USTranslational Therapeutics (United States) · US

Funding

Institutional Clinical and Translational Science AwardUL1TR000003 · NCATS · UNIVERSITY OF PENNSYLVANIA · PI FITZGERALD, GARRET A · 2012 to 2015
$38.9M
Cycling in a circadian circuitR37NS048471 · NINDS · UNIVERSITY OF PENNSYLVANIA · PI SEHGAL, AMITA · 2015 to 2021
$2.7M
High performance IBM iDataPlex/SONAS computing cluster for genomicsS10OD012312 · OD · UNIVERSITY OF PENNSYLVANIA · PI KIM, JUNHYONG · 2013 to 2013
$2.0M
Determining the importance of temporal regulation of the blood-brain barrierK99HL147212 · NHLBI · UNIVERSITY OF PENNSYLVANIA · PI ZHANG, SHIRLEY · 2019 to 2021
$206k
Howard Hughes Medical InstituteNCATS NIH HHS UL1 TR000003NHLBI NIH HHS K99 HL147212NIH HHS S10 OD012312NINDS NIH HHS R37 NS048471
6 · The paper itself

Abstract

The blood-brain barrier (BBB) is critical for neural function. We report here circadian regulation of the BBB in mammals. Efflux of xenobiotics by the BBB oscillates in mice, with highest levels during the active phase and lowest during the resting phase. This oscillation is abrogated in circadian clock mutants. To elucidate mechanisms of circadian regulation, we profiled the transcriptome of brain endothelial cells; interestingly, we detected limited circadian regulation of transcription, with no evident oscillations in efflux transporters. We recapitulated the cycling of xenobiotic efflux using a human microvascular endothelial cell line to find that the molecular clock drives cycling of intracellular magnesium through transcriptional regulation of TRPM7, which appears to contribute to the rhythm in efflux. Our findings suggest that considering circadian regulation may be important when therapeutically targeting efflux transporter substrates to the CNS.

Indexed as

Circadian ClocksAnimalsARNTL Transcription FactorsATP Binding Cassette Transporter, Subfamily B, Member 1Biological TransportBlood-Brain BarrierCell LineEndothelial CellsGene Expression RegulationHumansMagnesiumMiceMice, Inbred C57BLModels, BiologicalPermeabilityProtein Serine-Threonine KinasesARNTL Transcription FactorsATP Binding Cassette Transporter, Subfamily B, Member 1MagnesiumProtein Serine-Threonine KinasesRNA, MessengerTRPM7 protein, humanTRPM Cation ChannelsXenobiotics

Identifiers

PMID33504784
PMCPMC7841146
OpenAlexW3125740657

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.