Evidence map›Paper›PMID 26843332›Full record

ArticleJournal of sleep research2016

Obstructive sleep apnea is associated with low GABA and high glutamate in the insular cortex.

Paul M Macey, Manoj K Sarma, Rajakumar Nagarajan, Ravi Aysola, Jerome M Siegel, Ronald M Harper, M Albert Thomas

Open access · hybridAbstract read
In one paragraph

Article in Journal of sleep research, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 31 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
31citing papers in PubMed, 1 pooled it
2.0field-weighted citation impact, top 16% 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

31 citing papers in PubMed, 1 synthesis or guideline pooled it, 52 citations in OpenAlex.

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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 1 institution in 1 country.

Paul M MaceySchool of Nursing, University of California at Los Angeles, Los Angeles, CA, USA.
Manoj K SarmaDepartment of Radiological Sciences, University of California at Los Angeles, Los Angeles, CA, USA.
Rajakumar NagarajanDepartment of Radiological Sciences, University of California at Los Angeles, Los Angeles, CA, USA.
Ravi AysolaDepartment of Medicine (Division of Pulmonary and Critical Care), University of California at Los Angeles, Los Angeles, CA, USA.
Jerome M SiegelDepartment of Psychiatry, University of California at Los Angeles, Los Angeles, CA, USA.
Ronald M HarperBrain Research Institute, University of California at Los Angeles, Los Angeles, CA, USA.
M Albert ThomasDepartment of Radiological Sciences, University of California at Los Angeles, Los Angeles, CA, USA.
University of California, Los Angeles · US

Funding

Hypocretin Release in Disease States and BehaviorR01MH064109 · NIMH · UNIVERSITY OF CALIFORNIA LOS ANGELES · PI SIEGEL, JEROME M · 2001 to 2016
$7.7M
Role of hypocretin in opiate addiction and withdrawalR01DA034748 · NIDA · UNIVERSITY OF CALIFORNIA LOS ANGELES · PI SIEGEL, JEROME M · 2014 to 2024
$6.3M
Obstructive Sleep Apnea, Gender Biology, and Autonomic RegulationR01NR013693 · NINR · UNIVERSITY OF CALIFORNIA LOS ANGELES · PI MACEY, PAUL M · 2013 to 2017
$2.0M
What Causes Human Narcolepsy?I01BX001753 · VA · VA GREATER LOS ANGELES HEALTHCARE SYSTEM · PI SIEGEL, JEROME M · 2013 to 2020
–
BLRD VA I01 BX001753BLRD VA IK6 BX005245NIDA NIH HHS R01 DA034748NIMH NIH HHS R01 MH064109NINR NIH HHS R01 NR013693
6 · The paper itself

Abstract

The insular cortex is injured in obstructive sleep apnea (OSA) and responds inappropriately to autonomic challenges, suggesting neural reorganization. The objective of this study was to assess whether the neural changes might result from γ-aminobutyric acid (GABA) and glutamate alterations. We studied 14 OSA patients [mean age ± standard deviation (SD): 47.5 ± 10.5 years; nine male; apnea-hypopnea index (AHI): 29.5 ± 15.6 events h(-1) ] and 22 healthy participants (47.5 ± 10.1 years; 11 male), using magnetic resonance spectroscopy to detect GABA and glutamate levels in insular cortices. We localized the cortices with anatomical scans, and measured neurochemical levels from anterior to mid-regions. Left and right anterior insular cortices showed lower GABA and higher glutamate in OSA versus healthy subjects [GABA left: OSA n = 6: 0.36 ± 0.10 (mean ± SD), healthy n = 5: 0.62 ± 0.18; P < 0.05), right: OSA n = 11: 0.27 ± 0.09, healthy n = 14: 0.45 ± 0.16; P < 0.05; glutamate left: OSA n = 6: 1.61 ± 0.32, healthy n = 8: 0.94 ± 0.34; P < 0.05, right: OSA n = 14: 1.26 ± 0.28, healthy n = 19: 1.02 ± 0.28; P < 0.05]. GABA and glutamate levels were correlated only within the healthy group in the left insula (r: -0.9, P < 0.05). The altered anterior insular levels of GABA and glutamate may modify integration and projections to autonomic areas, contributing to the impaired cardiovascular regulation in OSA.

Indexed as

Autonomic Nervous SystemCase-Control StudiesCerebral CortexFemalegamma-Aminobutyric AcidGlutamic AcidHumansMagnetic Resonance ImagingMaleMiddle AgedNeuroimagingSleep Apnea, Obstructivegamma-Aminobutyric AcidGlutamic Acidautonomicintermittent excitoxicity hypoxianeurotransmitter

Identifiers

PMID26843332
PMCPMC4974152
OpenAlexW2278362609

What OpenQuestion holds

Textmetadata
LicenceTDM
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.