TNF-α inhibitors reduce inflammation-induced concentric remodelling, but not diastolic dysfunction in collagen-induced arthritis.

Regina Le Roux, Lebogang Mokotedi, Serena Fourie, Ashmeetha Manilall, Sule Gunter, Aletta Millen*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

OBJECTIVES:
To determine biologic disease-modifying anti-rheumatic drug effects on inflammation-induced cardiac geometry and function changes.

METHODS:
Male and female Sprague-Dawley rats (n=92) were divided into four groups: control group, collagen-induced arthritis (CIA) group, anti-TNF-α group and anti-IL-6 group. Inflammation was induced by injecting bovine type-II collagen emulsified in incomplete Freund’s adjuvant at the base of the tail, in all groups except the control group. Following the onset of arthritis, the anti-TNF-α group received etanercept, and the anti-IL-6 group received tocilizumab, for six weeks. Left ventricular (LV) geometry and function were assessed with echocardiography and circulating inflammatory markers were measured with ELISA.

RESULTS:
Relative wall thickness in the CIA and anti-IL-6 groups were increased compared to controls (p<0.001 and p=0.02, respectively). TNF-α inhibition protected against inflammation-induced LV concentric remodelling, as relative wall thickness in the anti-TNF-α group was similar to controls (p=0.55). Systolic function variables were not different between the groups. In all groups inoculated with collagen, myocardial relaxation (lateral e’) were impaired compared to controls (all p<0.001). LV filling pressures (E/e’) were increased in the CIA, anti-TNF-α and anti-IL-6 groups compared to controls (p<0.001, p<0.001 and p=0.05, respectively). Independent of concentric remodelling, circulating CRP concentrations were associated with decreased e’ and increased E/e’, while TNF-α concentrations were associated with E/A.

CONCLUSIONS:
TNF-α inhibition protected against inflammation-induced adverse cardiac remodelling, but not diastolic dysfunction. IL-6 receptors blocker effects on inflammation-induced cardiac changes were inconclusive. Systemic inflammation likely impacts LV concentric remodelling and diastolic dysfunction through distinct pathways.
Original languageEnglish
Article number33427610
Pages (from-to)24-32
Number of pages9
JournalClinical Experimental Rheumatology
Volume40
Issue number1
DOIs
Publication statusPublished - 28 Jan 2022
Externally publishedYes

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