Evidence map›Paper›PMID 25623624›Full record

ArticleOsteoarthritis and cartilage2015

Dissecting the contribution of knee joint NGF to spinal nociceptive sensitization in a model of OA pain in the rat.

D R Sagar, L Nwosu, D A Walsh, V Chapman

Open access · hybridAbstract read
In one paragraph

Article in Osteoarthritis and cartilage, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
2.6field-weighted citation impact, top 10% 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

16 citing papers in PubMed, 32 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

4 authors at 2 institutions in 1 country.

D R SagarArthritis Research UK Pain Centre, University of Nottingham, Nottingham, UK; School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK.
L NwosuArthritis Research UK Pain Centre, University of Nottingham, Nottingham, UK; Department of Academic Rheumatology, University of Nottingham, Clinical Sciences Building, Nottingham City Hospital, NG5 1PB, UK.
D A WalshArthritis Research UK Pain Centre, University of Nottingham, Nottingham, UK; Department of Academic Rheumatology, University of Nottingham, Clinical Sciences Building, Nottingham City Hospital, NG5 1PB, UK.
V ChapmanArthritis Research UK Pain Centre, University of Nottingham, Nottingham, UK; School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK. Electronic address: victoria.chapman@nottingham.ac.uk.
Versus Arthritis · GBUniversity of Nottingham · GB

Funding

Arthritis Research UK 18769
6 · The paper itself

Abstract

objectiveAlthough analgesic approaches targeting nerve growth factor (NGF) for the treatment of osteoarthritis (OA) pain remain of clinical interest, neurophysiological mechanisms by which NGF contribute to OA pain remain unclear. We investigated the impact of local elevation of knee joint NGF on knee joint, vs remote (hindpaw), evoked responses of spinal neurones in a rodent model of OA pain.

designIn vivo spinal electrophysiology was carried out in anaesthetised rats with established pain behaviour and joint pathology following intra-articular injection of monosodium iodoacetate (MIA), vs injection of saline. Neuronal responses to knee joint extension and flexion, mechanical punctate stimulation of the peripheral receptive fields over the knee and at a remote site (ipsilateral hind paw) were studied before, and following, intra-articular injection of NGF (10 μg/50 μl) or saline.

resultsMIA-injected rats exhibited significant local (knee joint) and remote (lowered hindpaw withdrawal thresholds) changes in pain behaviour, and joint pathology. Intra-articular injection of NGF significantly (P < 0.05) increased knee extension-evoked firing of spinal neurones and the size of the peripheral receptive fields of spinal neurones (100% increase) over the knee joint in MIA rats, compared to controls. Intra-articular NGF injection did not significantly alter responses of spinal neurones following noxious stimulation of the ipsilateral hind paw in MIA-injected rats.

conclusionThe facilitatory effects of intra-articular injection of NGF on spinal neurones receiving input from the knee joint provide a mechanistic basis for NGF mediated augmentation of OA knee pain, however additional mechanisms may contribute to the spread of pain to remote sites.

Indexed as

AnimalsArthritis, ExperimentalBehavior, AnimalInjections, Intra-ArticularIodoacetic AcidMaleNerve Growth FactorNociceptionOsteoarthritisPainPain MeasurementPain ThresholdPhysical StimulationRats, Sprague-DawleySpinal NervesIodoacetic AcidNerve Growth FactorMonosodium iodoacetateOsteoarthritisPainSpinal

Identifiers

PMID25623624
PMCPMC4459966
OpenAlexW2061425558

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LicenceCC BY-NC-ND
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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.