Inhibition of NF-κB activation by a novel IKK inhibitor reduces the severity of experimental autoimmune myocarditis via suppression of T-cell activation

Watanabe, Ryoji; Azuma, Ryoko Wakizono; Suzuki, Jun–ichi; Ogawa, Masahito; Itai, Akiko; Hirata, Yasunobu; Komuro, Issei; Isobe, Mitsuaki

doi:10.1152/ajpheart.00159.2013

Cited by 22 publications

(12 citation statements)

References 49 publications

(116 reference statements)

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“…In our cells, this increased IκBα phosphorylation did not appear to be due to a higher IKK-αβ-complex kinase activity after TLR activation, as observed in T cells [29]. Other processes, such as nondegradative polyubiquitination, have been reported to be crucial for IκB kinase (IKK) activation [30].…”

Section: Discussionsupporting

confidence: 64%

DLK1 is a novel inflammatory inhibitor which interferes with NOTCH1 signaling in TLR‐activated murine macrophages

González¹,

Ruiz-García²,

Monsalve³

et al. 2015

Eur J Immunol

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Delta-like protein 1 (DLK1) is a noncanonical ligand that inhibits NOTCH1 receptor activity and regulates multiple differentiation processes. In macrophages, NOTCH signaling increases TLR-induced expression of key pro-inflammatory mediators. We have investigated the role of DLK1 in macrophage activation and inflammation using Dlk1-deficient mice and Raw 264.7 cells overexpressing Dlk1. In the absence of Dlk1, NOTCH1 expression is increased and the activation of macrophages with TLR3 or TLR4 agonists leads to higher production of IFN-β and other pro-inflammatory cytokines, including TNF-α, IL-12, and IL-23. The expression of key proteins involved in IFN-β signaling, such as IRF3, IRF7, IRF1, or STAT1, as well as cRel, or RelB, which are responsible for the generation of IL-12 and IL-23, is enhanced in Dlk1 KO macrophages. Consistently, Dlk1 KO mice are more sensitive to LPS-induced endotoxic shock. These effects seem to be mediated through the modulation of NOTCH1 signaling. TLR4 activation reduces DLK1 expression, whereas increases NOTCH1 levels. In addition, DLK1 expression diminishes during differentiation of human U937 cells to macrophages. Overall, these results reveal a novel role for DLK1 as a regulator of NOTCH-mediated, pro-inflammatory macrophage activation, which could help to ensure a baseline level preventing constant tissue inflammation.Keywords: Cytokine r DLK1 r Inflammatory inhibitor r Macrophage r NOTCH signaling r TLR Additional supporting information may be found in the online version of this article at the publisher's web-site IntroductionMacrophages are key cells in innate and adaptive immune response to pathogens. Toll-like receptors (TLR) recognize conserved microbial structures and induce the activation of macrophages, thus increasing their phagocytic and cytotoxic activities, and leading to the production of inflammatory cytokines, Correspondence: Dr. María J. Ruiz-Hidalgo and Dr. María J. M. Díaz-Guerra e-mail: Maria.RHidalgo@uclm.es; MariaJose.Martinez@uclm.es such as TNF-α and IL-1, and cytokines of the IL-6 and IL-12 families, which regulate T-cell differentiation [1].Macrophages display a remarkable plasticity and can change their functioning in response to environmental signals, which allows a fine-tuning of their activity to adapt to different situations. Unrestrained activation of TLR responses can lead to excessive inflammation and tissue damage and contribute to the pathogenesis of inflammatory disorders, such as septic shock. Multiple mechanisms are implicated in the control of macrophage activation, including inhibitory cytokines, transcriptional repressors, and epigenetic modifications [2,3].C 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.eji-journal.eu 2616 María J. González et al. Eur. J. Immunol. 2015. 45: 2615-2627 In this line, a critical role for NOTCH signaling in macrophage activation and polarization has been evidenced [4][5][6]. Ligand binding to the NOTCH receptors triggers a two-step proteolytic cleavage causing the release of the NOTCH intracellular doma...

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Section: Discussionsupporting

confidence: 64%

DLK1 is a novel inflammatory inhibitor which interferes with NOTCH1 signaling in TLR‐activated murine macrophages

González¹,

Ruiz-García²,

Monsalve³

et al. 2015

Eur J Immunol

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“…Therefore, we screened multiple related compounds and found that N-(3,5-bis-trifluoromethyl-phenyl)-5-chloro-2-hydroxybenzamide (IMD 0354) is a non-ATP binding competitive and selective molecular inhibitor of IKK-β. IMD 0354 has been reported in several studies as an effective agent for the treatment of acute and subacute inflammatory diseases including myocarditis, pulmonary arterial hypertension, and diabetic retinopathy via the suppression of NF-κB activation in various cells, such as pulmonary arterial smooth muscle cells or myocardial cells [18][19][20][21] . There are considerable issues in regard to the drugs for osteoporosis treatment currently.…”

Section: Introductionmentioning

confidence: 99%

The emerging role of IMD 0354 on bone homeostasis by suppressing osteoclastogenesis and bone resorption, but without affecting bone formation

et al. 2019

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Osteoporosis is caused by an imbalance between bone formation and bone resorption. Receptor activator of nuclear factor-κB ligand (RANKL) promotes the activity and differentiation of osteoclasts via activating the nuclear factor-κB (NF-κB) and mitogen-activated protein kinase (MAPK) signaling pathways. IMD 0354 is a selective molecular inhibitor of inhibitor of NF-κB kinase subunit beta (IKKβ) and effective for treatment of acute and subacute inflammatory diseases through the suppression of NF-κB activation. However, the effect of IMD 0354 on bone homeostasis is unknown. In this study, we demonstrated that IMD 0354 significantly attenuated ovariectomy-induced bone loss and inhibited osteoclastogenesis in mice, whereas bone formation was not affected. Additionally, IMD 0354 dramatically inhibited osteoclast differentiation and function induced by RANKL and macrophage colony-stimulating factor in bone marrow monocytes as verified by tartrate-resistant acid phosphatase (TRAP) staining as well as bone resorption assay in vitro. Subsequently, we found that activation of NF-κB signaling and the ERK/c-Fos axis were blunted during osteoclast formation induced by RANKL. Transcription factors nuclear factor of activated T cells c1 (NFATc1) and c-Fos were suppressed with the decreased expression of osteoclast-related genes by IMD 0354. Our findings suggest that IMD 0354 could be a potential preventive and therapeutic drug for osteoporosis.

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“…Most of the evidence which suggests that myocarditis and inflammatory cardiomyopathy are autoimmune diseases come from animal models [1, 2]. The macrophages and T lymphocytes were found to be directly engaged in cell-mediated immune mechanism in experimental autoimmune myocarditis (EAM) [3–5].…”

Section: Introductionmentioning

confidence: 99%

Neopterin and Beta-2 Microglobulin Relations to Immunity and Inflammatory Status in Nonischemic Dilated Cardiomyopathy Patients

Wojciechowska

Wodniecki

Wojnicz

et al. 2014

Mediators of Inflammation

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Background. The aim of the study was to assess the relationships among serum neopterin (NPT), β2-microglobulin (β2-M) levels, clinical status, and endomyocardial biopsy results of dilated cardiomyopathy patients (DCM). Methods. Serum NPT and β-2 M were determined in 172 nonischaemic DCM patients who underwent right ventricular endomyocardial biopsy and 30 healthy subjects (ELISA test). The cryostat biopsy specimens were assessed using histology, immunohistology, and immunochemistry methods (HLA ABC, HLA DR expression, CD3 + lymphocytes, and macrophages counts). Results. The strong increase of HLA ABC or HLA DR expression was detected in 27.2% patients—group A—being low in 72.8% patients—group B. Neopterin level was increased in patients in group A compared to healthy controls 8.11 (4.50–12.57) versus 4.99 (2.66–8.28) nmol/L (P < 0.05). β-2 microglobulin level was higher in DCM groups A (2.60 (1.71–3.58)) and B (2.52 (1.51–3.72)) than in the control group 1.75 (1.28–1.96) mg/L, P < 0.001. Neopterin correlated positively with the number of macrophages in biopsy specimens (P < 0.05) acute phase proteins: C-reactive proteins (P < 0.05); fibrinogen (P < 0.01); and NYHA functional class (P < 0.05) and negatively with left ventricular ejection fraction (P < 0.05). Conclusions. Neopterin but not β-2 microglobulin concentration reflected immune response in biopsy specimens. Neopterin correlated with acute phase proteins and stage of heart failure and may indicate a general immune and inflammatory activation in heart failure.

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Inhibition of NF-κB activation by a novel IKK inhibitor reduces the severity of experimental autoimmune myocarditis via suppression of T-cell activation

Cited by 22 publications

References 49 publications

DLK1 is a novel inflammatory inhibitor which interferes with NOTCH1 signaling in TLR‐activated murine macrophages

DLK1 is a novel inflammatory inhibitor which interferes with NOTCH1 signaling in TLR‐activated murine macrophages

The emerging role of IMD 0354 on bone homeostasis by suppressing osteoclastogenesis and bone resorption, but without affecting bone formation

Neopterin and Beta-2 Microglobulin Relations to Immunity and Inflammatory Status in Nonischemic Dilated Cardiomyopathy Patients

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