Evidence map›Paper›PMID 22733753›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2012

Transient opening of the perineurial barrier for analgesic drug delivery.

Dagmar Hackel, Susanne M Krug, Reine-Solange Sauer, Shaaban A Mousa, Alexander Böcker, Diana Pflücke, Esther-Johanna Wrede, Katrin Kistner, Tali Hoffmann, Benedikt Niedermirtl and 9 more

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 47 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
47citing papers in PubMed, 1 pooled it
4.2field-weighted citation impact, top 6% 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

47 citing papers in PubMed, 1 synthesis or guideline pooled it, 90 citations in OpenAlex.

  1. FcRn as a Transporter for Nasal Delivery of Biologics: A Systematic Review.International journal of molecular sciences · 2021
    Pooled it
  2. Modulation of antibody transport in the brain and spinal cord through the intranasal pathway.Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics · 2025
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  20. High-frequency, low-intensity ultrasound and microbubbles enhance nerve blockade.Journal of controlled release : official journal of the Controlled Release Society · 2018
    Article
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

19 authors at 5 institutions in 1 country.

Dagmar HackelDepartment of Anesthesiology, University Hospitals Wurzburg, Julius Maximilians University, 97080 Würzburg, Germany.
Susanne M Krug
Reine-Solange Sauer
Shaaban A Mousa
Alexander Böcker
Diana Pflücke
Esther-Johanna Wrede
Katrin Kistner
Tali Hoffmann
Benedikt Niedermirtl
Claudia Sommer
Laura Bloch
Otmar Huber
Ingolf E Blasig
Salah Amasheh
Peter W Reeh
Michael Fromm
Alexander Brack
Heike L Rittner
Charité - Universitätsmedizin Berlin · DEFriedrich-Alexander-Universität Erlangen-Nürnberg · DEFriedrich Schiller University Jena · DELeibniz Association · DEUniversitätsklinikum Würzburg · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Selective targeting of sensory or nociceptive neurons in peripheral nerves remains a clinically desirable goal. Delivery of promising analgesic drugs is often impeded by the perineurium, which functions as a diffusion barrier attributable to tight junctions. We used perineurial injection of hypertonic saline as a tool to open the perineurial barrier transiently in rats and elucidated the molecular action principle in mechanistic detail: Hypertonic saline acts via metalloproteinase 9 (MMP9). The noncatalytic hemopexin domain of MMP9 binds to the low-density lipoprotein receptor-related protein-1, triggers phosphorylation of extracellular signal-regulated kinase 1/2, and induces down-regulation of the barrier-forming tight junction protein claudin-1. Perisciatic injection of any component of this pathway, including MMP9 hemopexin domain or claudin-1 siRNA, enables an opioid peptide ([D-Ala2,N-Me-Phe4,Gly5-ol]-enkephalin) and a selective sodium channel (NaV1.7)-blocking toxin (ProToxin-II) to exert antinociceptive effects without motor impairment. The latter, as well as the classic TTX, blocked compound action potentials in isolated nerves only after disruption of the perineurial barrier, which, in return, allowed endoneurally released calcitonin gene-related peptide to pass through the nerve sheaths. Our data establish the function and regulation of claudin-1 in the perineurium as the major sealing component, which could be modulated to facilitate drug delivery or, potentially, reseal the barrier under pathological conditions.

Indexed as

AnalgesicsAnimalsBlotting, WesternClaudin-1Dielectric SpectroscopyDrug Delivery SystemsExtracellular Signal-Regulated MAP KinasesFluorescent Antibody TechniqueGene Expression RegulationMatrix Metalloproteinase 9Membrane ProteinsPain ThresholdPeripheral NervesPhosphorylationRatsRNA, Small InterferingAnalgesicsClaudin-1Cldn1 protein, ratExtracellular Signal-Regulated MAP KinasesMatrix Metalloproteinase 9Membrane ProteinsRNA, Small InterferingSaline Solution, Hypertonic

Identifiers

PMID22733753
PMCPMC3406837
OpenAlexW2145518630

What OpenQuestion holds

Textmetadata
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.