Severity of intervertebral disc herniation regulates cytokine and chemokine levels in patients with chronic radicular back pain

H E Jacobsen, A N Khan, M E Levine, C G Filippi, N O Chahine, H E Jacobsen, A N Khan, M E Levine, C G Filippi, N O Chahine

Abstract

Objective: The contributions of intervertebral disc disease and subject-specific covariates to systemic inflammation in low back pain are unknown. We examined the effects of symptomatic disc herniation (DH) and MRI herniation severity on serum cytokine levels in clinical subjects.

Design: Cytokine levels from lumbar DH subjects (N = 78) were compared to control subjects (N = 57) accounting for effects of DH, age, body mass index (BMI) and gender. Effect of DH severity on cytokine levels was analyzed on subsets of subjects with acute or chronic pain. Serum cytokines were also analyzed in a subset of patients between pre- and 3 months post-surgery.

Results: Cytokine levels were elevated in the serum of patients with symptomatic DH, and the covariates age, BMI and gender significantly contributed to levels of some cytokines. Severity of herniation was a significant contributor to pain intensity (VAS), serum levels of HMGB1, PDGFbb, and IL-9. The relationship between DH severity and cytokine levels was confirmed in subjects with chronic, but not acute symptoms. Serum levels of macrophage migration inhibitory factor (MIF) decreased, whereas levels of CCL3, CCL11, CXCL1, and CXCL10 were significantly elevated post surgery.

Conclusions: This study is the first to show that DH severity is coordinately associated with changes in serum levels of inflammatory cytokines in chronic pain subjects. HMGB1, PDGFbb and IL-9 are novel mediators of increasing DH severity, indicative of cellular damage, neuro-inflammation and angiogenesis. Resolution of inflammation was observed with decrease in MIF post surgery. However, elevated chemokine levels indicate ongoing remodeling and wound healing at 3-month time point.

Keywords: Herniated disc; Inflammation; Intervertebral disc; MRI severity; Pain.

Conflict of interest statement

Conflict of Interest

The authors have declared that no conflict of interest exists

Copyright © 2020 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved.

Figures

Figure 1.
Figure 1.
Radiological analysis of herniation severity. (a,b) moderate-sized herniation showing (a) T2-weighted MRI and (b) measurement of disc herniation (dashed line) and the central canal diameter (solid line) in the anterior to posterior dimension. (c,d) Large (i.e. severe) central disc herniation showing measurements of disc herniation (dashed) and the central spinal canal (solid line) in the anterior to posterior dimensions. (e) Axial T2 weighted image of a small (i.e. mild) central herniation with ventral effacement of the thecal sac but no associated nerve root compression. (f) Right subarticular herniation with ventral effacement of the thecal sac and compression of the traversing nerve root.
Figure 2.
Figure 2.
Serum levels of (a) HMGB1, (b) PDGFbb, and (c) IL-9 in DH subjects as function of DH severity. #pρ) and p value for significant correlations observed % intrusion (of herniation) and serum levels of (d) HMGB-1 (N=78), (e) PDGF-bb (N=78), and (f) Pain (VAS; N=34). (g) Spearman correlation between VAS and MMP-1 levels (N=34). Each point on scatter plot represents one subject, and line represents the correlation fit.
Figure 3.
Figure 3.
Effects of DH severity in chronic (a-h) and acute (a’-h’) subjects. (a, a’) VAS scores across severity groups. (b,b’) Spearman correlation between VAS and (b) Eotaxin or (b’) MMP-1 (ρ: Spearman correlation coefficient). Serum levels of (c,c’) HMGB1, (d,d’) PDGFbb, (e,e’) MMP-1, (f,f’) IL-9, (g,g’) Eotaxin, and (h,h’) RANTES in chronic and acute subjects, respectively. Bar graph are indicative of mean and standard deviation. * p<0.05 vs. Mild in multiple group comparison based on post-hoc test.
Figure 4.
Figure 4.
(a) Volcano plot of serum cytokine levels post surgery vs. pre-surgery. Each triangle represents fold change (Post/Pre) in cytokine level (x-axis) and p-value (y-axis). Fold change=1 is indicated as ‘No effect’ and significance was set at p=0.05. Serum levels of (b) MF decreased post surgery, while levels of (c) CCL11, (d) CCL3, (e) CXCL1, and (f) CXCL10 significantly increased post surgery. In (b) to (f) scatter plot indicate individual patient levels pre- and post-surgery, with bar graph indicative of mean and standard deviation.

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