Evidence map›Paper›PMID 23127847›Full record

ArticleNeuroscience letters2012

CNS penetration of the opioid glycopeptide MMP-2200: a microdialysis study.

Omar S Mabrouk, Torsten Falk, Scott J Sherman, Robert T Kennedy, Robin Polt

Open access · greenAbstract read
In one paragraph

Article in Neuroscience letters, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed
0.5field-weighted citation impact, top 43% 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

17 citing papers in PubMed, 36 citations in OpenAlex.

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  16. CNS active O-linked glycopeptides.Frontiers in chemistry · 2015
    Review
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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

5 authors at 2 institutions in 1 country.

Omar S MabroukDepartment of Chemistry, University of Michigan, Ann Arbor, MI, USA.
Torsten Falk
Scott J Sherman
Robert T Kennedy
Robin Polt
University of Arizona · USUniversity of Michigan–Ann Arbor · US

Funding

POSTDOCTORAL TRAINING IN THE BIOLOGY OF DRUG ABUSET32DA007268 · NIDA · UNIVERSITY OF MICHIGAN AT ANN ARBOR · PI TRAYNOR, JOHN R. · 1991 to 2021
$6.7M
In vivo chemical monitoring using capillary separationsR37EB003320 · NIBIB · UNIVERSITY OF MICHIGAN AT ANN ARBOR · PI KENNEDY, ROBERT T · 2008 to 2017
$3.6M
BIOUSIAN GLYCONEUROPEPTIDE AMPHIPATHS PENETRATE THE BBBR01NS052727 · NINDS · UNIVERSITY OF ARIZONA · PI POLT, ROBIN · 2007 to 2011
$1.6M
NIBIB NIH HHS R37 EB003320NIDA NIH HHS T32 DA007268NIDA NIH HHS T32 DA07268NINDS NIH HHS NS-052727NINDS NIH HHS R01 NS052727
6 · The paper itself

Abstract

Endogenous opioid peptides enkephalin and dynorphin are major co-transmitters of striatofugal pathways of the basal ganglia. They are involved in the genesis of levodopa-induced dyskinesia and in the modulation of direct and indirect striatal output pathways that are disrupted in Parkinson's disease. One pharmacologic approach is to develop synthetic glycopeptides closely resembling endogenous peptides to restore their normal functions. Glycosylation promotes penetration of the blood-brain barrier. We investigated CNS penetration of the opioid glycopeptide MMP-2200, a mixed δ/μ-agonist based on leu-enkephalin, as measured by in vivo microdialysis and subsequent mass spectrometric analysis in awake, freely moving rats. The glycopeptide (10 mg/kg) reaches the dorsolateral striatum (DLS) rapidly after systemic (i.p.) administration and is stably detectable for the duration of the experiment (80 min). The detected level at the end of the experiment (around 250 pM) is about 10-fold higher than the level of the endogenous leu-enkephalin, measured simultaneously. This is one of the first studies to directly prove that glycosylation of an endogenous opioid peptide leads to excellent blood-brain barrier penetration after systemic injection, and explains robust behavioral effects seen in previous studies by measuring how much glycopeptide reaches the target structure, in this case the DLS.

Indexed as

AnimalsGlycopeptidesMaleMicrodialysisOpioid PeptidesRatsRats, Sprague-DawleyGlycopeptidesOpioid Peptidestyrosyl-glycyl-phenylalanyl-leucyl-(O-lactosyl)serinamide

Identifiers

PMID23127847
PMCPMC3539793
OpenAlexW1968862955

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.