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Published in: European Spine Journal 1/2016

01-01-2016 | Original Article

Osteoclast activators are elevated in intervertebral disks with Modic changes among patients operated for herniated nucleus pulposus

Authors: Matias Torkki, Marja-Leena Majuri, Henrik Wolff, Tatu Koskelainen, Marianne Haapea, Jaakko Niinimäki, Harri Alenius, Jeffrey Lotz, Jaro Karppinen

Published in: European Spine Journal | Issue 1/2016

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Abstract

Purpose

Modic changes (MC) are associated with low back pain (LBP). Inflammation is considered as a key factor that triggers symptoms in especially type I MC, but so far of the potential inflammatory candidates only TNFα has been linked to MC. The objective of the study was to analyze a set of inflammatory mediators in human surgical disk samples and quantify their association with MC in the adjacent vertebral bodies.

Methods

The study sample consisted of 51 intervertebral disk tissue specimens; 20 ‘No MC’ disks, 19 ‘Type I MC’ disks, and 12 ‘Type II MC’ disks. mRNA expression of 46 cytokines was quantified from isolated RNA. Tissue samples were stained using hematoxylin and eosin, toluidine blue, Herovici, CD68 and CD163.

Results

No significant differences were found in the amount of macrophages or presence of chondrocyte conglomerates between the MC groups. Of the multiple genes tested, statistically significant associations were observed for M-CSF1 (p = 0.028), RANKL (p = 0.035), RUNX1 (p = 0.032), and RUNX2 (p = 0.047) that were increased in ‘Type II MC,’ while OSCAR (p = 0.042) was increased in ‘Type I MC’ group compared to ‘No MC.’

Conclusions

Since these cytokines are related to differentiation and proliferation of osteoclasts, our data suggest that the stimulation of vertebral osteoclasts by factors secreted by disk tissue is involved in the pathophysiology of MC.
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Metadata
Title
Osteoclast activators are elevated in intervertebral disks with Modic changes among patients operated for herniated nucleus pulposus
Authors
Matias Torkki
Marja-Leena Majuri
Henrik Wolff
Tatu Koskelainen
Marianne Haapea
Jaakko Niinimäki
Harri Alenius
Jeffrey Lotz
Jaro Karppinen
Publication date
01-01-2016
Publisher
Springer Berlin Heidelberg
Published in
European Spine Journal / Issue 1/2016
Print ISSN: 0940-6719
Electronic ISSN: 1432-0932
DOI
https://doi.org/10.1007/s00586-015-3897-y

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