scholarly journals TRPA1 Promotes Cardiac Myofibroblast Transdifferentiation after Myocardial Infarction Injury via the Calcineurin-NFAT-DYRK1A Signaling Pathway

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Shuang Li ◽  
Xiongshan Sun ◽  
Hao Wu ◽  
Peng Yu ◽  
Xin Wang ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Cardiac Function ◽  
Molecular Mechanisms ◽  
Transient Receptor Potential ◽  
Transforming Growth Factor ◽  
Nuclear Translocation ◽  
Cardiac Fibroblasts ◽  
Gene Transfection ◽  
Receptor Potential

Cardiac fibroblasts (CFs) are a critical cell population responsible for myocardial extracellular matrix homeostasis. After stimulation by myocardial infarction (MI), CFs transdifferentiate into cardiac myofibroblasts (CMFs) and play a fundamental role in the fibrotic healing response. Transient receptor potential ankyrin 1 (TRPA1) channels are cationic ion channels with a high fractional Ca2+ current, and they are known to influence cardiac function after MI injury; however, the molecular mechanisms regulating CMF transdifferentiation remain poorly understood. TRPA1 knockout mice, their wild-type littermates, and mice pretreated with the TRPA1 agonist cinnamaldehyde (CA) were subjected to MI injury and monitored for survival, cardiac function, and fibrotic remodeling. TRPA1 can drive myofibroblast transdifferentiation initiated 1 week after MI injury. In addition, we explored the underlying mechanisms via in vitro experiments through gene transfection alone or in combination with inhibitor treatment. TRPA1 overexpression fully activated CMF transformation, while CFs lacking TRPA1 were refractory to transforming growth factor β- (TGF-β-) induced transdifferentiation. TGF-β enhanced TRPA1 expression, which promoted the Ca2+-responsive activation of calcineurin (CaN). Moreover, dual-specificity tyrosine-regulated kinase-1a (DYRK1A) regulated CaN-mediated NFAT nuclear translocation and TRPA1-dependent transdifferentiation. These findings suggest a potential therapeutic role for TRPA1 in the regulation of CMF transdifferentiation in response to MI injury and indicate a comprehensive pathway driving CMF formation in conjunction with TGF-β, Ca2+ influx, CaN, NFATc3, and DYRK1A.

Abstract 292: TRPA1 Promoting Myofibroblast Differentiation Mediate Pressure Overload-Induced Cardiac Fibrosis

Circulation ◽  
2018 ◽  
Vol 138 (Suppl_2) ◽  
Author(s):  
Shuang Li ◽  
Dong Han ◽  
Dachun Yang
Keyword(s):  
Knockout Mice ◽  
Molecular Mechanisms ◽  
Cardiac Fibrosis ◽  
Transient Receptor Potential ◽  
Transforming Growth Factor ◽  
Ventricular Remodeling ◽  
Cardiac Fibroblasts ◽  
Gene Transfection ◽  
Pressure Overload

Background: Hypertensive ventricular remodeling is a common cause of heart failure. Activation and accumulation of cardiac fibroblasts is the key contributors to this progression. Our previous studies indicate that transient receptor potential ankyrin 1 (TRPA1), a Ca 2+ channel necessary and sufficient, play a prominent role in ventricular remodeling. However, the molecular mechanisms regulating remain poorly understood. Methods: We used TRPA1 agonists cinnamaldehyde (CA) pretreatment and TRPA1 knockout mice to understand the role of TRPA1 in ventricular remodeling of hypertensive heart. We also examine the mechanisms through gene transfection and in vitro experiments. Results: TRPA1 overexpression fully activated myofibroblast transformation, while fibroblasts lacking TRPA1 were refractory to transforming growth factor β (TGF-β) -induced transdifferentiation. TRPA1 knockout mice showed hypertensive ventricular remodeling reversal following pressure overload. We found that the TGF-β induced TRPA1 expression through calcineurin-NFAT-Dyrk1A signaling pathway via the TRPA1 promoter. Once induced, TRPA1 activates the Ca 2+ -responsive protein phosphatase calcineurin, which itself induced myofibroblast transdifferentiation. Moreover, inhibition of calcineurin prevented TRPA1-dependent transdifferentiation. Conclusion: Our study provides the first evidence that TRPA1 regulation in cardiac fibroblasts transformation in response to hypertensive stimulation. The results suggesting a comprehensive pathway for myofibroblast formation in conjunction with TGF-β, Calcineurin, NFAT and Dyrk1A. Furthermore, these data indicate that negative modulation of cardiac fibroblast TRPA1 may represent a therapeutic strategy against hypertensive cardiac remodeling.

MiR-150 Attenuates Maladaptive Cardiac Remodeling Mediated by Long Noncoding RNA MIAT and Directly Represses Profibrotic Hoxa4

2022 ◽  
Author(s):  
Tatsuya Aonuma ◽  
Bruno Moukette ◽  
Satoshi Kawaguchi ◽  
Nipuni P. Barupala ◽  
Marisa N. Sepúlveda ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Cardiac Remodeling ◽  
Long Noncoding Rna ◽  
Noncoding Rna ◽  
Molecular Mechanisms ◽  
Cardiac Fibroblasts ◽  
Cardiac Fibroblast ◽  
Null Mouse ◽  
Increased Risk

Background: MicroRNA-150 (miR-150) plays a protective role in heart failure (HF). Long noncoding RNA, myocardial infarction–associated transcript (MIAT) regulates miR-150 function in vitro by direct interaction. Concurrent with miR-150 downregulation, MIAT is upregulated in failing hearts, and gain-of-function single-nucleotide polymorphisms in MIAT are associated with increased risk of myocardial infarction (MI) in humans. Despite the correlative relationship between MIAT and miR-150 in HF, their in vivo functional relationship has never been established, and molecular mechanisms by which these 2 noncoding RNAs regulate cardiac protection remain elusive. Methods: We use MIAT KO (knockout), Hoxa4 (homeobox a4) KO, MIAT TG (transgenic), and miR-150 TG mice. We also develop DTG (double TG) mice overexpressing MIAT and miR-150. We then use a mouse model of MI followed by cardiac functional, structural, and mechanistic studies by echocardiography, immunohistochemistry, transcriptome profiling, Western blotting, and quantitative real-time reverse transcription-polymerase chain reaction. Moreover, we perform expression analyses in hearts from patients with HF. Lastly, we investigate cardiac fibroblast activation using primary adult human cardiac fibroblasts and in vitro assays to define the conserved MIAT/miR-150/HOXA4 axis. Results: Using novel mouse models, we demonstrate that genetic overexpression of MIAT worsens cardiac remodeling, while genetic deletion of MIAT protects hearts against MI. Importantly, miR-150 overexpression attenuates the detrimental post-MI effects caused by MIAT. Genome-wide transcriptomic analysis of MIAT null mouse hearts identifies Hoxa4 as a novel downstream target of the MIAT/miR-150 axis. Hoxa4 is upregulated in cardiac fibroblasts isolated from ischemic myocardium and subjected to hypoxia/reoxygenation. HOXA4 is also upregulated in patients with HF. Moreover, Hoxa4 deficiency in mice protects the heart from MI. Lastly, protective actions of cardiac fibroblast miR-150 are partially attributed to the direct and functional repression of profibrotic Hoxa4 . Conclusions: Our findings delineate a pivotal functional interaction among MIAT, miR-150, and Hoxa4 as a novel regulatory mechanism pertinent to ischemic HF.

Molecular mechanisms of mechanical load-induced osteoarthritis

2021 ◽  
Author(s):  
Tianshun Fang ◽  
Xianhao Zhou ◽  
Mingchao Jin ◽  
Jiangbo Nie ◽  
XIongfeng Li
Keyword(s):  
Mechanical Loading ◽  
Molecular Mechanisms ◽  
Transient Receptor Potential ◽  
Transforming Growth Factor ◽  
Mechanical Load ◽  
Receptor Potential ◽  
Transient Receptor Potential Channel ◽  
Transforming Growth Factor Β ◽  
Chondrocyte Apoptosis ◽  
Transient Receptor

Abstract Introduction Mechanical loading enhances the progression of osteoarthritis. However, its molecular mechanisms have not been established. Objective The aim of this review was to summarize the probable mechanisms of mechanical load-induced osteoarthritis. Methods A comprehensive search strategy was used to search PubMed and EMBASE databases (from the 15th of January 2015 to the 20th of October 2020). Search terms included “osteoarthritis”, “mechanical load”, and “mechanism”. Results Abnormal mechanical loading activates the interleukin-1β, tumour necrosis factor-α, nuclear factor kappa-B, Wnt, transforming growth factor-β, microRNAs pathways, and the oxidative stress pathway. These pathways induce the pathological progression of osteoarthritis. Mechanical stress signal receptors such as integrin, ion channel receptors, hydrogen peroxide-inducible clone-5, Gremlin-1, and transient receptor potential channel 4 are present in the articular cartilages. Conclusion This review highlights the molecular mechanisms of mechanical loading in inducing chondrocyte apoptosis and extracellular matrix degradation. These mechanisms provide potential targets for osteoarthritis prevention and treatment.

scholarly journals CREG ameliorates the phenotypic switching of cardiac fibroblasts after myocardial infarction via modulation of CDC42

2021 ◽  
Vol 12 (4) ◽  
Author(s):  
Dan Liu ◽  
Xiaoxiang Tian ◽  
Yanxia Liu ◽  
Haixu Song ◽  
Xiaoli Cheng ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Cardiac Function ◽  
Cardiac Fibrosis ◽  
Cardiac Fibroblasts ◽  
Phenotypic Switching ◽  
Littermate Control ◽  
Border Regions ◽  
Phenotype Switching

AbstractPhenotype switching of cardiac fibroblasts into myofibroblasts plays important role in cardiac fibrosis following myocardial infarction (MI). Cellular repressor of E1A-stimulated genes (CREG) protects against vascular and cardiac remodeling induced by angiotensin-II. However, the effects and mechanisms of CREG on phenotype switching of cardiac fibroblasts after MI are unknown. This study aimed to investigate the role of CREG on the phenotype switching of cardiac fibroblasts following MI and its mechanism. Our findings demonstrated that, compared with littermate control mice, cardiac function was deteriorated in CREG+/− mice on day 14 post-MI. Fibrosis size, αSMA, and collagen-1 expressions were increased in the border regions of CREG+/− mice on day 14 post-MI. Conversely, exogenous CREG protein significantly improved cardiac function, inhibited fibrosis, and reduced the expressions of αSMA and collagen-1 in the border regions of C57BL/6J mice on day 14. In vitro, CREG recombinant protein inhibited αSMA and collagen-1 expression and blocked the hypoxia-induced proliferation and migration of cardiac fibroblasts, which was mediated through the inhibition of cell division control protein 42 (CDC42) expression. Our findings could help in establishing new strategies based on the clarification of the role of the key molecule CREG in phenotype switching of cardiac fibroblasts following MI.

Emodin Down-Regulates Expression of TRPV1 mRNA and Its Function in DRG Neurons in Vitro

2010 ◽  
Vol 38 (04) ◽  
pp. 789-800 ◽  
Author(s):  
Feng Sui ◽  
Hai-Ru Huo ◽  
Chang-Bin Zhang ◽  
Na Yang ◽  
Jian-You Guo ◽  
...  
Keyword(s):  
Mrna Expression ◽  
Molecular Mechanisms ◽  
Transient Receptor Potential ◽  
Receptor Potential ◽  
Transient Receptor Potential Vanilloid ◽  
Drg Neurons ◽  
Fluorescent Intensity ◽  
Inflammatory Stimuli ◽  
Transient Receptor

Emodin is a principle ingredient isolated from rhubarb rhizome, which is commonly used for constipation or pain-related diseases in traditional Chinese medicine (TCM) practice. The transient receptor potential vanilloid 1 ion channel proteins (TRPV1) are abundantly expressed in the peripheral sensory neurons and are assumed to act as a kind of nociceptor involved in the perception of pain and development of hyperalgesia. The aim of this study was to further unravel the analgesic mechanisms of rhubarb through investigating the effects of its main constitutive ingredient emodin on the expression of TRPV1 mRNA as well as on its calcium- mediating functions in vitro. The primary DRG neurons with a high purity and viability were obtained, and the TRPV1 mRNA expression levels were examined by using real-time RT-PCR and the elevated amplitudes of intracellular [ Ca2+ ] i in the DRG neurons evoked by TRPV1 agonist capsaicin were examined by confocal microscopy. The results showed that emodin could significantly down-regulate both the mRNA expression of TRPV1 and the capsaicin-evoked intracellular fluorescent intensity in the DRG neurons under both 37°C and 39°C in vitro. Concomitantly, all of the changes induced by emodin could not be blocked by pretreatment of the primary neurons with capsazepine, an antagonist of TRPV1. In conclusion, we established that the mRNA expression level of TRPV1 and its calcium-mediating function in naive DRG neurons could be down-regulated by emodin through perhaps the non-TRPV1 channel pathways, and this might be the molecular mechanisms for rhubarb to inhibit hyperalgesia induced by inflammatory stimuli.

scholarly journals MicroRNAs—The Heart of Post-Myocardial Infarction Remodeling

Diagnostics ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1675
Author(s):  
Liana Maries ◽  
Cătălin Marian ◽  
Raluca Sosdean ◽  
Flavia Goanta ◽  
Ioan Ovidiu Sirbu ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Signaling Pathways ◽  
Transforming Growth Factor Beta ◽  
Molecular Mechanisms ◽  
Transforming Growth Factor ◽  
Ventricular Remodeling ◽  
Left Ventricular Remodeling ◽  
Cardiac Fibroblasts ◽  
Pressure Overload ◽  
Left Ventricular

Myocardial infarction (MI) is one of the most frequent cardiac emergencies, with significant potential for mortality. One of the major challenges of the post-MI healing response is that replacement fibrosis could lead to left ventricular remodeling (LVR) and heart failure (HF). This process involves canonical and non-canonical transforming growth factor-beta (TGF-β) signaling pathways translating into an intricate activation of cardiac fibroblasts and disproportionate collagen synthesis. Accumulating evidence has indicated that microRNAs (miRNAs) significantly contribute to the modulation of these signaling pathways. This review summarizes the recent updates regarding the molecular mechanisms underlying the role of the over 30 miRNAs involved in post-MI LVR. In addition, we compare the contradictory roles of several multifunctional miRNAs and highlight their potential use in pressure overload and ischemia-induced fibrosis. Finally, we discuss their attractive role as prognostic biomarkers for HF, highlighting the most relevant human trials involving these miRNAs.

scholarly journals Lycorine Attenuates Autophagy in Osteoclasts via an Axis of mROS/TRPML1/TFEB to Reduce LPS-Induced Bone Loss

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Hyun-Jung Park ◽  
Malihatosadat Gholam-Zadeh ◽  
Jae-Hee Suh ◽  
Hye-Seon Choi
Keyword(s):  
Bone Loss ◽  
Transient Receptor Potential ◽  
Nuclear Translocation ◽  
Therapeutic Potential ◽  
Receptor Potential ◽  
Tartrate Resistant Acid Phosphatase ◽  
Main Role ◽  
Sequestosome 1

Lycorine, a plant alkaloid, exhibits anti-inflammatory activity by acting in macrophages that share precursor cells with osteoclasts (OCs). We hypothesized that lycorine might decrease bone loss by acting in OCs after lipopolysaccharide (LPS) stimulation, since OCs play a main role in LPS-induced bone loss. Microcomputerized tomography (μCT) analysis revealed that lycorine attenuated LPS-induced bone loss in mice. In vivo tartrate-resistant acid phosphatase (TRAP) staining showed that increased surface area and number of OCs in LPS-treated mice were also decreased by lycorine treatment, suggesting that OCs are responsible for the bone-sparing effect of lycorine. In vitro, the increased number and activity of OCs induced by LPS were reduced by lycorine. Lycorine also decreased LPS-induced autophagy in OCs by evaluation of decreased lipidated form of microtubule-associated proteins 1A/1B light chain 3B (LC3) (LC3II) and increased sequestosome 1 (p62). Lycorine attenuated oxidized transient receptor potential cation channel, mucolipin subfamily (TRPML1) by reducing mitochondrial reactive oxygen species (mROS) and decreased transcription factor EB (TFEB) nuclear translocation. Lycorine reduced the number and activity of OCs by decreasing autophagy in OCs via an axis of mROS/TRPML1/TFEB. Collectively, lycorine protected against LPS-induced bone loss by acting in OCs. Our data highlight the therapeutic potential of lycorine for protection against inflammatory bone loss.

scholarly journals The mTORC2/Akt/NFκB Pathway-Mediated Activation of TRPC6 Participates in Adriamycin-Induced Podocyte Apoptosis

2016 ◽  
Vol 40 (5) ◽  
pp. 1079-1093 ◽  
Author(s):  
Hai-Tao Zhang ◽  
Wei-Wei Wang ◽  
Li-Hong Ren ◽  
Xia-Xia Zhao ◽  
Zhi-Hui Wang ◽  
...  
Keyword(s):  
Transient Receptor Potential ◽  
Nuclear Translocation ◽  
Receptor Potential ◽  
Dependent Manner ◽  
Channel Activity ◽  
Akt Inhibitor ◽  
Glomerular Diseases ◽  
Nfκb Pathway ◽  
Induced Apoptosis

Background/Aims: Although increased expression and gain function of transient receptor potential cation channel 6 (TRPC6) has been associated with the pathogenesis of some proteinuric glomerular diseases, it remains elusive how TRPC6 participates in the process of podocyte damage. Methods: The potential signaling responsible for TRPC6 activation was investigated using immunoblot assays in an in vitro podocyte injury model induced by Adriamycin (ADR). Podocyte apoptosis was measured using FITC-conjugated Annexin V and Propidium Iodide staining. The channel activity of TRPC6 was assessed using the Ca2+ influx assay. Results: Increase of TRPC6 expression was detected in ADR-treated podocytes, and TRPC6 knockdown significantly decreased ADR-induced podocytes apoptosis. Following ADR treatment, phospho-mTORSer2481 and phospho-AktSer473 was significantly increased in a time-dependent manner, whereas phospho-mTORSer2448 and phospho-p70S6KThr389 showed no change. ADR-induced apoptosis was prevented by ku0063794 (a dual mTOR complexes inhibitor), not by rapamycin (a specific mTORC1 inhibitor). Furthermore, nuclear translocation of NFκB/p65 was detected in ADR-treated podocytes, which was prevented by an Akt inhibitor triciribine. Of note, NFκB inhibitor PDTC prevented ADR-induced increase of TRPC6, and decreased ADR-induced apoptosis. We found that Akt activation and NFκB nuclear translocation was significantly inhibited by knockdown of mTORC2 protein Rictor, not by mTORC1 protein Raptor. In comparison with control, the Ca2+ influx was significantly increased in ADR-treated podocytes, which was remarkably prevented by TRPC6 knockdown. ADR-induced increase of TRPC6 channel activity was dramatically prevented by ku0063794, but not by rapamycin. Additionally, knockdown of Rictor, not Raptor, prevented ADR-induced increase of the Ca2+ influx. Moreover, the application of NFκB inhibitor PDTC also prevented the Ca2+ influx in ADR-treated podocytes. Conclusions: Our findings revealed that the mTORC2/Akt/NFκB pathway-mediated activation of TRPC6 participates in ADR-induced podocyte apoptosis.

scholarly journals Salvia miltiorrhizaandCarthamus tinctoriusExtract Prevents Cardiac Fibrosis and Dysfunction after Myocardial Infarction by Epigenetically Inhibiting Smad3 Expression

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Jing Yang ◽  
Bo Wang ◽  
Na Li ◽  
Qingqing Zhou ◽  
Wenhui Zhou ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Growth Factor ◽  
Cardiac Function ◽  
Myocardial Fibrosis ◽  
Histone Methylation ◽  
Cardiac Fibrosis ◽  
Transforming Growth Factor ◽  
Cardiac Fibroblasts ◽  
Salvia Miltiorrhiza ◽  
Left Ventricular

The incidence of cardiac dysfunction after myocardial infarction (MI) continues to increase despite advances in treatment. Excessive myocardial fibrosis plays a vital role in the development of adverse cardiac remodeling and deterioration of cardiac function. Understanding the molecular and cellular mechanism of the fibrosis process and developing effective therapeutics are of great importance.Salvia miltiorrhizaandCarthamus tinctoriusextract (SCE) is indicated for angina pectoris and other ischemic cardiovascular diseases in China. SCE has been shown to inhibit the platelet activation and aggregation, ameliorate ROS-induced myocardial necrosis by inhibiting mitochondrial permeability transition pore opening, and promote angiogenesis by upregulating the expression of vascular endothelial growth factor (VEGF). However, whether SCE has effect on cardiac fibrosis after MI is not fully clear. Here, a mouse model of MI was established to observe the effect of SCE upon survival, cardiac function, myocardial fibrosis, and inflammation. Quantitative PCR and western blot assays were used to determine the expression of genes related to transforming growth factor-β(TGF-β) cascade and inflammatory responsesin vivo. Additionally, the effects of SCE upon the collagen production, TGF-β/Smad3 (SMAD family member 3) signaling, and the levels of histone methylation in primary cardiac fibroblasts were detected. We found that SCE treatment significantly improved survival and left ventricular function in mice after MI. Inhibition of inflammation and fibrosis, as well as decreased expression of Smad3, was observed with SCE treatment. In TGF-β-stimulated cardiac fibroblasts, SCE significantly decreased the expression of collagen,α-smooth muscle actin (α-SMA), and Smad3. Furthermore, SCE treatment downregulated the levels of H3K4 trimethylation (H3K4me3) and H3K36 trimethylation (H3K36me3) at theSmad3promoter region of cardiac fibroblasts, leading to inhibition ofSmad3transcription. Our findings suggested that SCE prevents myocardial fibrosis and adverse remodeling after MI with a novel mechanism of suppressing histone methylation of theSmad3promoter and its transcription.

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