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IL-27 promotes cardiac fibroblast activation and aggravates cardiac remodeling post myocardial infarction.

ABSTRACT: Excessive and chronic inflammation post myocardial infarction (MI) causes cardiac fibrosis and progressive ventricular remodeling, which leads to heart failure. We previously found high levels of IL-27 in the heart and serum until day 14 in murine cardiac ischemia‒reperfusion injury models. However, whether IL-27 is involved in chronic inflammation-mediated ventricular remodeling remains unclear. In the present study, we found that MI triggered high IL-27 expression in murine cardiac macrophages. The increased expression of IL-27 in serum is correlated with cardiac dysfunction and aggravated fibrosis after MI. Furthermore, the addition of IL-27 significantly activated the JAK/STAT signaling pathway in cardiac fibroblasts (CFs). Meanwhile, IL-27 treatment promoted the proliferation, migration and extracellular matrix (ECM) production of CFs induced by angiotensin II (Ang II). Collectively, high levels of IL-27 mainly produced by cardiac macrophages post MI contribute to the activation of CFs and aggravate cardiac fibrosis.

SUBMITTER: Ma X

PROVIDER: S-EPMC10333439 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature

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IL-27 promotes cardiac fibroblast activation and aggravates cardiac remodeling post myocardial infarction.

Ma Xiaoxue X Meng Qingshu Q Gong Shiyu S Shi Shanshan S Liang Xiaoting X Lin Fang F Gong Li L Liu Xuan X Li Yinzhen Y Li Mimi M Wei Lu L Han Wei W Gao Leng L Liu Zhongmin Z Zhou Xiaohui X

Heliyon 20230618 6

Excessive and chronic inflammation post myocardial infarction (MI) causes cardiac fibrosis and progressive ventricular remodeling, which leads to heart failure. We previously found high levels of IL-27 in the heart and serum until day 14 in murine cardiac ischemia‒reperfusion injury models. However, whether IL-27 is involved in chronic inflammation-mediated ventricular remodeling remains unclear. In the present study, we found that MI triggered high IL-27 expression in murine cardiac macrophages ...[more]

PMID: 37441391

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Project description:BackgroundThe serum levels of sclerostin (SOST) are significant elevated in patients with pathological cardiac remodeling after myocardial infarction (MI). However, the mechanisms of SOST in cardiac remodeling remain largely uncharacterized.MethodsCollecting patients with MI who presented with or without left ventricular (LV) remodeling, we investigated differences in SOST expression. The influence of overexpression and silenced of SOST on the angiogenesis of cardiac microvascular endothelial cells (CMECs) was explored through in vitro experiments, and the impact of SOST on Wnt signaling marker proteins was examined by quantitative reverse transcription-polymerase chain reaction (qRT-PCR) and Western blot. Finally, we observed the effects of SOST on cardiac function and morphology in mice MI model, and verified the role of the Wnt signaling marker proteins in vivo.ResultsSerum SOST was significantly increased in patients with cardiac remodeling. Increased SOST expression was also observed in the infarcted hearts of C57BL/6 mice that underwent ligation of the left anterior descending branch of the coronary artery to induce MI. Furthermore, loss and gain of function experiments were conducted to investigate the role of SOST in post-infarct cardiac remodeling in vivo and in vitro. Overexpression of SOST promoted the proliferation and migration of cardiac fibroblasts (CFs), and inhibited angiogenesis of CMECs. In addition, overexpressing SOST in mice significantly deteriorated the post-infarct cardiac remodeling, as shown by the increased LV end systolic and end diastolic dimensions, decreased ejection fraction, and increased myocyte cross-section area and myocardial fibrosis. However, suppressing SOST expression showed the opposite results. The expression of Wnt signaling marker proteins was inhibited after overexpression of SOST, and enhanced after suppression of SOST in vivo and in vitro, suggesting involvement of the Wnt signaling pathway.ConclusionsThe present study demonstrated that SOST aggravates post-infarct pathological myocardial remodeling by inhibiting angiogenesis of CMECs while promoting the proliferation of CFs, and this may be mediated by the Wnt signaling pathway. These results suggested that SOST might act as a biomarker to predict detrimental postinfarct cardiac remodeling, and may be a potential therapeutic target for the treatment of MI.

Project description:Chronic sympathoexcitation is implicated in ventricular arrhythmogenesis (VAs) following myocardial infarction (MI), but the critical neural pathways involved are not well understood. Cardiac adrenergic function is partly regulated by sympathetic afferent reflexes, transduced by spinal afferent fibers expressing the transient receptor potential cation subfamily V member 1 (TRPV1) channel. The role of chronic TRPV1 afferent signaling in VAs is not known. We hypothesized that persistent TRPV1 afferent neurotransmission promotes VAs after MI. Using epicardial resiniferatoxin (RTX) to deplete cardiac TRPV1-expressing fibers, we dissected the role of this neural circuit in VAs after chronic MI in a porcine model. We examined the underlying mechanisms using molecular approaches, IHC, in vitro and in vivo cardiac electrophysiology, and simultaneous cardioneural mapping. Epicardial RTX depleted cardiac TRPV1 afferent fibers and abolished functional responses to TRPV1 agonists. Ventricular tachycardia/fibrillation (VT/VF) was readily inducible in MI subjects by programmed electrical stimulation or cesium chloride administration; however, TRPV1 afferent depletion prevented VT/VF induced by either method. Mechanistically, TRPV1 afferent depletion did not alter cardiomyocyte action potentials and calcium transients, the expression of ion channels, or calcium handling proteins. However, it attenuated fibrosis and mitigated electrical instability in the scar border zone. In vivo recordings of cardiovascular-related stellate ganglion neurons (SGNs) revealed that MI enhances SGN function and disrupts integrated neural processing. Depleting TRPV1 afferents normalized these processes. Taken together, these data indicate that, after MI, TRPV1 afferent-induced adrenergic dysfunction promotes fibrosis and adverse cardiac remodeling, and it worsens border zone electrical heterogeneity, resulting in electrically unstable ventricular myocardium. We propose targeting TRPV1-expressing afferent to reduce VT/VF following MI.

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IL-27 promotes cardiac fibroblast activation and aggravates cardiac remodeling post myocardial infarction.

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IL-27 promotes cardiac fibroblast activation and aggravates cardiac remodeling post myocardial infarction.

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