Evidence map›Paper›PMID 21679434›Full record

ArticleBMC musculoskeletal disorders2011

Pain-related sensory innervation in monoiodoacetate-induced osteoarthritis in rat knees that gradually develops neuronal injury in addition to inflammatory pain.

Sumihisa Orita, Tetsuhiro Ishikawa, Masayuki Miyagi, Nobuyasu Ochiai, Gen Inoue, Yawara Eguchi, Hiroto Kamoda, Gen Arai, Tomoaki Toyone, Yasuchika Aoki and 3 more

Open access · goldAbstract read
In one paragraph

Article in BMC musculoskeletal disorders, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 115 papers.

0numbers the graph read from it
0cells of the map it votes in
115citing papers in PubMed
9.5field-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

115 citing papers in PubMed, 221 citations in OpenAlex.

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  12. Pain in fibrous dysplasia: identifying nociceptive mechanisms in a preclinical model.Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2025
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  19. Animal Models of Osteoarthritis: Updated Models and Outcome Measures 2016-2023.Regenerative engineering and translational medicine · 2024
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  20. Article

55 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

13 authors at 2 institutions in 1 country.

Sumihisa OritaDepartment of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, Chiba, Japan. sumihisa@silver.email.ne.jp
Tetsuhiro Ishikawa
Masayuki Miyagi
Nobuyasu Ochiai
Gen Inoue
Yawara Eguchi
Hiroto Kamoda
Gen Arai
Tomoaki Toyone
Yasuchika Aoki
Takekazu Kubo
Kazuhisa Takahashi
Seiji Ohtori
Chiba University · JPTeikyo University Chiba Medical Center · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe exact mechanism of knee osteoarthritis (OA)-associated pain is unclear, whereas mixed evidence of inflammatory pain and neuropathic pain has been noted. We aimed to investigate pain-related sensory innervation in a monoiodoacetate (MIA)-induced model of OA.

methodsSixty of seventy female Sprague Dawley rats of six week-old underwent intra-articular MIA and fluorogold (FG) retrograde neurotracer injection into their right (ipsilateral) knee, while their left knees were treated with FG in saline as a control (contralateral knee). Other rats were treated with FG only bilaterally, and used as controls. Rats were evaluated for tactile allodynia using von Frey hairs. Proinflammatory mediators in the knee soft tissues, including tumor necrosis factor (TNF)-α, interleukin (IL)-6, and nerve growth factor (NGF), were quantified using ELISAs to evaluate inflammation in the knee after 1, 4, 7, 14, 21, and 28 days post injection. Dorsal root ganglia (DRG) were immunostained for three molecules after 7, 14, 21, and 28 days post injection: calcitonin gene-related peptide (CGRP), a marker of inflammatory pain; and activating transcription factor-3 (ATF3) and growth associated protein-43 (GAP43), as markers for nerve injury and regenerating axons. The distribution of microglia in the spinal cord were also evaluated, because they have been reported to increase in neuropathic pain states. These evaluations were performed up to 28 days postinjection. P < 0.05 was considered significant.

resultsProgressive tactile allodynia and elevated cytokine concentrations were observed in ipsilateral knees. CGRP-immunoreactive (-ir) ipsilateral DRG neurons significantly increased, peaking at 14 days postinjection, while expression of FG-labeled ATF3-ir or ATF3-ir GAP43-ir DRG neurons significantly increased in a time-dependent manner. Significant proliferation of microglia were found with time in the ipsilateral dorsal horn.

conclusionsPain-related characteristics in a MIA-induced rat OA model can originate from an inflammatory pain state induced by the local inflammation initiated by inflammatory cytokines, and that state will be followed by gradual initiation of neuronal injury, which may induce the neuropathic pain state.

Indexed as

AnimalsArthralgiaChronic DiseaseDisease Models, AnimalDisease ProgressionFemaleInflammationInflammation MediatorsIodoacetic AcidLongitudinal StudiesNerve DegenerationOsteoarthritis, KneePeripheral Nervous System DiseasesRatsRats, Sprague-DawleySensory Receptor CellsInflammation MediatorsIodoacetic Acid

Identifiers

PMID21679434
PMCPMC3142251
OpenAlexW1967113556

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Registered trials

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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.