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Yogendran V, Mele L, Prysyazhna O, Budhram-Mahadeo VS. Vascular dysfunction caused by loss of Brn-3b/POU4F2 transcription factor in aortic vascular smooth muscle cells is linked to deregulation of calcium signalling pathways. Cell Death Dis 2023; 14:770. [PMID: 38007517 PMCID: PMC10676411 DOI: 10.1038/s41419-023-06306-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 09/14/2023] [Accepted: 11/07/2023] [Indexed: 11/27/2023]
Abstract
Phenotypic and functional changes in vascular smooth muscle cells (VSMCs) contribute significantly to cardiovascular diseases (CVD) but factors driving early adverse vascular changes are poorly understood. We report on novel and important roles for the Brn-3b/POU4F2 (Brn-3b) transcription factor (TF) in controlling VSMC integrity and function. Brn-3b protein is expressed in mouse aorta with localisation to VSMCs. Male Brn-3b knock-out (KO) aortas displayed extensive remodelling with increased extracellular matrix (ECM) deposition, elastin fibre disruption and small but consistent narrowing/coarctation in the descending aortas. RNA sequencing analysis showed that these effects were linked to deregulation of genes required for calcium (Ca2+) signalling, vascular contractility, sarco-endoplasmic reticulum (S/ER) stress responses and immune function in Brn-3b KO aortas and validation studies confirmed changes in Ca2+ signalling genes linked to increased intracellular Ca2+ and S/ER Ca2+ depletion [e.g. increased, Cacna1d Ca2+ channels; ryanodine receptor 2, (RyR2) and phospholamban (PLN) but reduced ATP2a1, encoding SERCA1 pump] and chaperone proteins, Hspb1, HspA8, DnaJa1 linked to increased S/ER stress, which also contributes to contractile dysfunction. Accordingly, vascular rings from Brn-3b KO aortas displayed attenuated contractility in response to KCl or phenylephrine (PE) while Brn-3b KO-derived VSMC displayed abnormal Ca2+ signalling following ATP stimulation. This data suggests that Brn-3b target genes are necessary to maintain vascular integrity /contractile function and deregulation upon loss of Brn-3b will contribute to contractile dysfunction linked to CVD.
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Affiliation(s)
- Vaishaali Yogendran
- Molecular Biology Development and Disease, UCL Institute of Cardiovascular Science, London, UK
| | - Laura Mele
- Molecular Biology Development and Disease, UCL Institute of Cardiovascular Science, London, UK
| | - Oleksandra Prysyazhna
- Clinical Pharmacology Centre, William Harvey Research Institute, Queen Mary University of London, London, UK
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Role of puerarin in pathological cardiac remodeling: A review. Pharmacol Res 2022; 178:106152. [DOI: 10.1016/j.phrs.2022.106152] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 02/28/2022] [Accepted: 03/01/2022] [Indexed: 12/22/2022]
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Abstract
Objective: We aimed to find crucial microRNAs (miRNAs) associated with the development of atrial fibrillation (AF), and then try to elucidate the possible molecular mechanisms of miRNAs in AF. Methods: The miRNA microarray, GSE68475, which included 10 right atrial appendage samples from patients with persistent AF and 11 samples from patients with normal sinus rhythm, was used for the analysis. After data preprocessing, differentially expressed miRNAs were screened using limma. Target genes of miRNAs were predicted using miRWalk2.0. We then conducted functional enrichment analyses for miRNA and target genes. Protein-protein interaction (PPI) network and module analyses for target genes were performed. Finally, transcription factors (TFs)-target genes regulatory network was predicted and constructed. Results: Seven genes, including CAMK2D, IGF2R, PPP2R2A, PAX6, POU3F2, YWHAE, and AP2A2, were targeted by TFs. Among these seven genes, CAMK2D (targeted by miR-31-5p), IGF2R (targeted by miR-204-5p), PAX6 (targeted by miR-223-3p), POU3F2 (targeted by miR-204-5p), YWHAE (targeted by miR-31-5p), and AP2A2 (targeted by miR-204-5p) belonged to the top 10 degree genes in the PPI network. Notably, MiR-204-5p, miR-31-5p, and miR-223-3p had more target genes. Besides, CAMK2D was enriched in some pathways, such as adrenergic signaling in cardiomyocytes pathway and cAMP signaling pathway. YWHAE was enriched in the Hippo signaling pathway. Conclusion: miR-31-5p played a crucial role in cardiomyocytes by targeting CAMK2D and YWHAE via cAMP and Hippo signaling pathways. miR-204 was involved in the progression of AF by regulating its target genes IGF2R, POU3F2, and AP2A2. On the other hand, miR-223-3p functioned in AF by targeting PAX6, which was associated with the regulation of apoptosis in AF. This study would provide a theoretical basis and potential therapeutic targets for the treatment of AF.
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Budhram-Mahadeo VS, Solomons MR, Mahadeo-Heads EAO. Linking metabolic dysfunction with cardiovascular diseases: Brn-3b/POU4F2 transcription factor in cardiometabolic tissues in health and disease. Cell Death Dis 2021; 12:267. [PMID: 33712567 PMCID: PMC7955040 DOI: 10.1038/s41419-021-03551-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 02/15/2021] [Accepted: 02/16/2021] [Indexed: 12/26/2022]
Abstract
Metabolic and cardiovascular diseases are highly prevalent and chronic conditions that are closely linked by complex molecular and pathological changes. Such adverse effects often arise from changes in the expression of genes that control essential cellular functions, but the factors that drive such effects are not fully understood. Since tissue-specific transcription factors control the expression of multiple genes, which affect cell fate under different conditions, then identifying such regulators can provide valuable insight into the molecular basis of such diseases. This review explores emerging evidence that supports novel and important roles for the POU4F2/Brn-3b transcription factor (TF) in controlling cellular genes that regulate cardiometabolic function. Brn-3b is expressed in insulin-responsive metabolic tissues (e.g. skeletal muscle and adipose tissue) and is important for normal function because constitutive Brn-3b-knockout (KO) mice develop profound metabolic dysfunction (hyperglycaemia; insulin resistance). Brn-3b is highly expressed in the developing hearts, with lower levels in adult hearts. However, Brn-3b is re-expressed in adult cardiomyocytes following haemodynamic stress or injury and is necessary for adaptive cardiac responses, particularly in male hearts, because male Brn-3b KO mice develop adverse remodelling and reduced cardiac function. As a TF, Brn-3b regulates the expression of multiple target genes, including GLUT4, GSK3β, sonic hedgehog (SHH), cyclin D1 and CDK4, which have known functions in controlling metabolic processes but also participate in cardiac responses to stress or injury. Therefore, loss of Brn-3b and the resultant alterations in the expression of such genes could potentially provide the link between metabolic dysfunctions with adverse cardiovascular responses, which is seen in Brn-3b KO mutants. Since the loss of Brn-3b is associated with obesity, type II diabetes (T2DM) and altered cardiac responses to stress, this regulator may provide a new and important link for understanding how pathological changes arise in such endemic diseases.
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Affiliation(s)
- Vishwanie S Budhram-Mahadeo
- Molecular Biology Development and Disease, Institute of Cardiovascular Science, University College London, London, UK.
| | - Matthew R Solomons
- Molecular Biology Development and Disease, Institute of Cardiovascular Science, University College London, London, UK
| | - Eeshan A O Mahadeo-Heads
- Molecular Biology Development and Disease, Institute of Cardiovascular Science, University College London, London, UK.,College of Medicine and Health, University of Exeter Medical School, St Luke's Campus, Exeter, UK
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Varshney A, Chahal G, Santos L, Stolper J, Hallab JC, Nim HT, Nikolov M, Yip A, Ramialison M. Human Cardiac Transcription Factor Networks. SYSTEMS MEDICINE 2021. [DOI: 10.1016/b978-0-12-801238-3.11597-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Wu D, Jia HY, Wei N, Li SJ. POU4F1 confers trastuzumab resistance in HER2-positive breast cancer through regulating ERK1/2 signaling pathway. Biochem Biophys Res Commun 2020; 533:533-539. [PMID: 32988584 DOI: 10.1016/j.bbrc.2020.09.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 09/02/2020] [Indexed: 12/11/2022]
Abstract
Over-expression of the human epidermal growth factor receptor-2 (HER2) is related to aggressive tumors and poor prognosis in breast cancer. Trastuzumab (TRA) resistance leads to tumor recurrence and metastasis, resulting in poor prognosis in HER2-positive breast cancer. POU Class 4 Homeobox 1 (POU4F1) is a member of the POU domain family transcription factors, and has a key role in regulating cancers. However, its effects on TRA-resistant HER2-positive breast cancer are still vague. In the present study, we found that POU4F1 expression was dramatically increased in clinical breast cancer specimens with TRA resistance. Higher POU4F1 was also detected in HER2-positive breast cancer cells with TRA resistance than that of the parental ones. Poor prognosis was detected in breast cancer patients with high POU4F1 expression. Under TRA treatment, POU4F1 knockdown significantly reduced the proliferative capacity of HER2-positive breast cancer cells with TRA resistance. POU4F1 silence also sensitized resistant HER-positive breast cancer cells to TRA treatment in vivo using a xenograft mouse model, along with the markedly reduced tumor growth rate and tumor weight. Moreover, we found that POU4F1 deletion greatly decreased the activation of mitogen-activated or extracellular signal-regulated protein kinase kinases 1 and 2 (MEK1/2) and extracellular-regulated kinase 1/2 (ERK1/2) signaling pathways in breast cancer cells with TRA resistance. Migration and invasion were also effectively hindered by POU4F1 knockdown in TRA-resistant HER2-positive breast cancer cells. Notably, we found that POU4F1 deletion-improved chemosensitivity of HER2-positive breast cancer cells with drug-resistance to TRA treatment was closely associated with the blockage of ERK1/2 signaling. Collectively, our findings reported a critical role of POU4F1 in regulating TRA resistance, and demonstrated the underlying molecular mechanisms in HER2-positive breast cancer. Thus, POU4F1 may be a promising prognostic and therapeutic target to develop effective treatment for overcoming TRA resistance.
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Affiliation(s)
- Di Wu
- Department of Breast Surgery, The First Hospital of Jilin University, Changchun, 130021, Jilin Province, China
| | - Hong-Yao Jia
- Department of Breast Surgery, The First Hospital of Jilin University, Changchun, 130021, Jilin Province, China
| | - Na Wei
- The First Operating Room, The First Hospital of Jilin University, Changchun, 130021, Jilin Province, China
| | - Si-Jie Li
- Department of Breast Surgery, The First Hospital of Jilin University, Changchun, 130021, Jilin Province, China.
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Mele L, Maskell LJ, Stuckey DJ, Clark JE, Heads RJ, Budhram-Mahadeo VS. The POU4F2/Brn-3b transcription factor is required for the hypertrophic response to angiotensin II in the heart. Cell Death Dis 2019; 10:621. [PMID: 31413277 PMCID: PMC6694165 DOI: 10.1038/s41419-019-1848-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 06/27/2019] [Accepted: 07/15/2019] [Indexed: 01/27/2023]
Abstract
Adult hearts respond to increased workload such as prolonged stress or injury, by undergoing hypertrophic growth. During this process, the early adaptive responses are important for maintaining cardiac output whereas at later stages, pathological responses such as cardiomyocyte apoptosis and fibrosis cause adverse remodelling, that can progress to heart failure. Yet the factors that control transition from adaptive responses to pathological remodelling in the heart are not well understood. Here we describe the POU4F2/Brn-3b transcription factor (TF) as a novel regulator of adaptive hypertrophic responses in adult hearts since Brn-3b mRNA and protein are increased in angiotensin-II (AngII) treated mouse hearts with concomitant hypertrophic changes [increased heart weight:body weight (HW:BW) ratio]. These effects occur specifically in cardiomyocytes because Brn-3b expression is increased in AngII-treated primary cultures of neonatal rat ventricular myocytes (NRVM) or foetal heart-derived H9c2 cells, which undergo characteristic sarcomeric re-organisation seen in hypertrophic myocytes and express hypertrophic markers, ANP/βMHC. The Brn-3b promoter is activated by known hypertrophic signalling pathways e.g. p42/p44 mitogen-activated protein kinase (MAPK/ERK1/2) or calcineurin (via NFAT). Brn-3b target genes, e.g. cyclin D1, GLUT4 and Bax, are increased at different stages following AngII treatment, supporting distinct roles in cardiac responses to stress. Furthermore, hearts from male Brn-3b KO mutant mice display contractile dysfunction at baseline but also attenuated hypertrophic responses to AngII treatment. Hearts from AngII-treated male Brn-3b KO mice develop further contractile dysfunction linked to extensive fibrosis/remodelling. Moreover, known Brn-3b target genes, e.g. GLUT4, are reduced in AngII-treated Brn-3b KO hearts, suggesting that Brn-3b and its target genes are important in driving adaptive hypertrophic responses in stressed heart.
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Affiliation(s)
- Laura Mele
- Molecular Biology Development and Disease, UCL Institute of Cardiovascular Science, London, UK
| | - Lauren J Maskell
- Molecular Biology Development and Disease, UCL Institute of Cardiovascular Science, London, UK
| | - Daniel J Stuckey
- Centre for Advanced Biomedical Imaging (CABI), Division of Medicine, UCL Faculty of Medical Sciences, London, UK
| | - James E Clark
- School of Cardiovascular Medicine and Sciences, Faculty of Life Sciences and Medicine, King's College, London, UK
| | - Richard J Heads
- School of Cardiovascular Medicine and Sciences, Faculty of Life Sciences and Medicine, King's College, London, UK
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Spirina LV, Chizhevskaya SY, Kondakova IV, Choinzonov EL. Reception of Sex Steroid Hormones in Thyroid Papillary Cancer Tissue and Relationship with Expression and Content of Transcription Factors Brn-3α and TRIM16. Bull Exp Biol Med 2018; 166:237-240. [DOI: 10.1007/s10517-018-4322-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Indexed: 01/27/2023]
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Ran MX, Li Y, Zhang Y, Liang K, Ren YN, Zhang M, Zhou GB, Zhou YM, Wu K, Wang CD, Huang Y, Luo B, Qazi IH, Zhang HM, Zeng CJ. Transcriptome Sequencing Reveals the Differentially Expressed lncRNAs and mRNAs Involved in Cryoinjuries in Frozen-Thawed Giant Panda ( Ailuropoda melanoleuca) Sperm. Int J Mol Sci 2018; 19:ijms19103066. [PMID: 30297640 PMCID: PMC6212861 DOI: 10.3390/ijms19103066] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/03/2018] [Accepted: 10/05/2018] [Indexed: 02/06/2023] Open
Abstract
Sperm cryopreservation and artificial insemination are important methods for giant panda breeding and preservation of extant genetic diversity. Lower conception rates limit the use of artificial insemination with frozen-thawed giant panda sperm, due to the lack of understanding of the cryodamaging or cryoinjuring mechanisms in cryopreservation. Long non-coding RNAs (lncRNAs) are involved in regulating spermatogenesis. However, their roles during cryopreservation remain largely unexplored. Therefore, this study aimed to identify differentially expressed lncRNAs and mRNAs associated with cryodamage or freeze tolerance in frozen-thawed sperm through high throughput sequencing. A total of 61.05 Gb clean reads and 22,774 lncRNA transcripts were obtained. From the sequencing results, 1477 significantly up-regulated and 1,396 significantly down-regulated lncRNA transcripts from fresh and frozen-thawed sperm of giant panda were identified. GO and KEGG showed that the significantly dysregulated lncRNAs and mRNAs were mainly involved in regulating responses to cold stress and apoptosis, such as the integral component of membrane, calcium transport, and various signaling pathways including PI3K-Akt, p53 and cAMP. Our work is the first systematic profiling of lncRNA and mRNA in fresh and frozen-thawed giant panda sperm, and provides valuableinsights into the potential mechanism of cryodamage in sperm.
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Affiliation(s)
- Ming-Xia Ran
- College of Animal Sciences and Technology, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
| | - Yuan Li
- College of Animal Sciences and Technology, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
| | - Yan Zhang
- College of Animal Sciences and Technology, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
| | - Kai Liang
- College of Animal Sciences and Technology, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
| | - Ying-Nan Ren
- College of Animal Sciences and Technology, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
| | - Ming Zhang
- College of Animal Sciences and Technology, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
| | - Guang-Bin Zhou
- College of Animal Sciences and Technology, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
| | - Ying-Min Zhou
- China Conservation and Research Center for the Giant Panda, Wolong 473000, China.
| | - Kai Wu
- China Conservation and Research Center for the Giant Panda, Wolong 473000, China.
| | - Cheng-Dong Wang
- China Conservation and Research Center for the Giant Panda, Wolong 473000, China.
| | - Yan Huang
- China Conservation and Research Center for the Giant Panda, Wolong 473000, China.
| | - Bo Luo
- China Conservation and Research Center for the Giant Panda, Wolong 473000, China.
| | - Izhar Hyder Qazi
- College of Animal Sciences and Technology, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
- Department of Veterinary Anatomy & Histology, Faculty of Bio-Sciences, Shaheed Benazir Bhutto University of Veterinary and Animal Sciences, Sakrand 67210, Pakistan.
| | - He-Min Zhang
- China Conservation and Research Center for the Giant Panda, Wolong 473000, China.
| | - Chang-Jun Zeng
- College of Animal Sciences and Technology, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
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High-density lipoprotein protects cardiomyocytes against necrosis induced by oxygen and glucose deprivation through SR-B1, PI3K, and AKT1 and 2. Biochem J 2018. [PMID: 29523748 PMCID: PMC5887020 DOI: 10.1042/bcj20170703] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The cardioprotective lipoprotein HDL (high-density lipoprotein) prevents myocardial infarction and cardiomyocyte death due to ischemia/reperfusion injury. The scavenger receptor class B, type 1 (SR-B1) is a high-affinity HDL receptor and has been shown to mediate HDL-dependent lipid transport as well as signaling in a variety of different cell types. The contribution of SR-B1 in cardiomyocytes to the protective effects of HDL on cardiomyocyte survival following ischemia has not yet been studied. Here, we use a model of simulated ischemia (oxygen and glucose deprivation, OGD) to assess the mechanistic involvement of SR-B1, PI3K (phosphatidylinositol-3-kinase), and AKT in HDL-mediated protection of cardiomyocytes from cell death. Neonatal mouse cardiomyocytes and immortalized human ventricular cardiomyocytes, subjected to OGD for 4 h, underwent substantial cell death due to necrosis but not necroptosis or apoptosis. Pretreatment of cells with HDL, but not low-density lipoprotein, protected them against OGD-induced necrosis. HDL-mediated protection was lost in cardiomyocytes from SR-B1-/- mice or when SR-B1 was knocked down in human immortalized ventricular cardiomyocytes. HDL treatment induced the phosphorylation of AKT in cardiomyocytes in an SR-B1-dependent manner. Finally, chemical inhibition of PI3K or AKT or silencing of either AKT1 or AKT2 gene expression abolished HDL-mediated protection against OGD-induced necrosis of cardiomyocytes. These results are the first to identify a role of SR-B1 in mediating the protective effects of HDL against necrosis in cardiomyocytes, and to identify AKT activation downstream of SR-B1 in cardiomyocytes.
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Maskell LJ, Qamar K, Babakr AA, Hawkins TA, Heads RJ, Budhram-Mahadeo VS. Essential but partially redundant roles for POU4F1/Brn-3a and POU4F2/Brn-3b transcription factors in the developing heart. Cell Death Dis 2017; 8:e2861. [PMID: 28594399 PMCID: PMC5520879 DOI: 10.1038/cddis.2017.185] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 03/17/2017] [Accepted: 03/21/2017] [Indexed: 01/15/2023]
Abstract
Congenital heart defects contribute to embryonic or neonatal lethality but due to the complexity of cardiac development, the molecular changes associated with such defects are not fully understood. Here, we report that transcription factors (TFs) Brn-3a (POU4F1) and Brn-3b (POU4F2) are important for normal cardiac development. Brn-3a directly represses Brn-3b promoter in cardiomyocytes and consequently Brn-3a knockout (KO) mutant hearts express increased Brn-3b mRNA during mid-gestation, which is linked to hyperplastic growth associated with elevated cyclin D1, a known Brn-3b target gene. However, during late gestation, Brn-3b can cooperate with p53 to enhance transcription of pro-apoptotic genes e.g. Bax, thereby increasing apoptosis and contribute to morphological defects such as non-compaction, ventricular wall/septal thinning and increased crypts/fissures, which may cause lethality of Brn-3a KO mutants soon after birth. Despite this, early embryonic lethality in e9.5 double KO (Brn-3a-/- : Brn-3b-/-) mutants indicate essential functions with partial redundancy during early embryogenesis. High conservation between mammals and zebrafish (ZF) Brn-3b (87%) or Brn-3a (76%) facilitated use of ZF embryos to study potential roles in developing heart. Double morphant embryos targeted with morpholino oligonucleotides to both TFs develop significant cardiac defects (looping abnormalities and valve defects) suggesting essential roles for Brn-3a and Brn-3b in developing hearts.
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Affiliation(s)
- Lauren J Maskell
- Medical Molecular Biology Unit, Institute of Cardiovascular Science, University College London, UCL Rayne Building, London, UK
| | - Kashif Qamar
- Medical Molecular Biology Unit, Institute of Cardiovascular Science, University College London, UCL Rayne Building, London, UK
| | - Aram A Babakr
- Medical Molecular Biology Unit, Institute of Cardiovascular Science, University College London, UCL Rayne Building, London, UK
| | - Thomas A Hawkins
- Division of Biosciences, Cell and Developmental Biology, UCL, London, UK
| | - Richard J Heads
- Cardiovascular Division, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Vishwanie S Budhram-Mahadeo
- Medical Molecular Biology Unit, Institute of Cardiovascular Science, University College London, UCL Rayne Building, London, UK
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Sun Y, Su Q, Li L, Wang X, Lu Y, Liang J. MiR-486 regulates cardiomyocyte apoptosis by p53-mediated BCL-2 associated mitochondrial apoptotic pathway. BMC Cardiovasc Disord 2017; 17:119. [PMID: 28486954 PMCID: PMC5424355 DOI: 10.1186/s12872-017-0549-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 05/02/2017] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Cardiomyocyte apoptosis is a common pathological manifestation that occurs in several heart diseases. This study aimed to explore the mechanism of microRNA-486 (miR-486) in cardiomyocyte apoptosis by interfering with the p53-activated BCL-2 associated mitochondrial pathway. METHODS miR-486 mimics and inhibitors were transfected into the primary cardiomyocytes of suckling Sprague-Dawley rat pups, and H2O2 was used to induce apoptosis. Flow cytometry and TUNEL were both used to detect cardiomyocyte apoptosis, while the relative mRNA transcript and protein levels of miR-486, p53, Bbc3, BCL-2, and cleaved caspase-3 were detected using RT-PCR and western blot analysis, respectively. RESULTS miR-486 overexpression significantly decreased the expressions of p53, Bbc3 and cleaved caspase-3 (P < 0.05), and BCL-2 expression was significantly increased (P < 0.05), which in turn caused a significant decrease in the rate of cardiomyocyte apoptosis (P < 0.05). In contrast, miR-486 silencing resulted in an elevated rate of cardiomyocyte apoptosis (P < 0.05). CONCLUSION miR-486 may regulate cardiomyocyte apoptosis via p53-mediated BCL-2 associated mitochondrial apoptotic pathway. Therefore, up-regulating miR-486 expression in cardiomyocytes can effectively reduce the activation of the BCL-2 associated mitochondrial apoptotic pathway, consequently protecting cardiomyocytes.
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Affiliation(s)
- Yuhan Sun
- Department of Cardiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
| | - Qiang Su
- Department of Cardiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
| | - Lang Li
- Department of Cardiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.
| | - Xiantao Wang
- Department of Cardiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
| | - Yuanxi Lu
- Department of Cardiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
| | - Jiabao Liang
- Department of Cardiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China
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Magarin M, Pohl T, Lill A, Schulz H, Blaschke F, Heuser A, Thierfelder L, Donath S, Drenckhahn JD. Embryonic cardiomyocytes can orchestrate various cell protective mechanisms to survive mitochondrial stress. J Mol Cell Cardiol 2016; 97:1-14. [PMID: 27106802 DOI: 10.1016/j.yjmcc.2016.04.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 04/15/2016] [Indexed: 02/06/2023]
Abstract
Whereas adult cardiomyocytes are highly susceptible to stress, cardiomyocytes in the prenatal heart appear to be rather resistant. To investigate how embryonic cardiomyocytes respond to metabolic stress in vivo, we utilized tissue mosaicism for mitochondrial dysfunction in 13.5dpc mouse hearts. The latter is based on inactivation of the X-linked gene encoding Holocytochrome c synthase (Hccs), which is essential for mitochondrial respiration. In heterozygous heart conditional Hccs knockout females (cHccs(+/-)) random X chromosomal inactivation results in a mosaic of healthy and HCCS deficient cells in the myocardium. Microarray RNA expression analyses identified genes involved in unfolded protein response (UPR) and programmed cell death as differentially expressed in cHccs(+/-) versus control embryonic hearts. Activation of the UPR is localized to HCCS deficient cardiomyocytes but does not involve ER stress pathways, suggesting that it is caused by defective mitochondria. Consistently, mitochondrial chaperones, such as HSP10 and HSP60, but not ER chaperones are induced in defective cells. Mitochondrial dysfunction can result in oxidative stress, but no evidence for excessive ROS (reactive oxygen species) production was observed in cHccs(+/-) hearts. Instead, the antioxidative proteins SOD2 and PRDX3 are induced, suggesting that ROS detoxification prevents oxidative damage in HCCS deficient cardiomyocytes. Mitochondrial dysfunction and unrestricted UPR can induce cell death, and we detected the initiation of upstream events of both intrinsic as well as extrinsic apoptosis in cHccs(+/-) hearts. Cell death is not executed, however, suggesting the activation of antiapoptotic mechanisms. Whereas most apoptosis inhibitors are either unchanged or downregulated in HCCS deficient cardiomyocytes, Bcl-2 and ARC (apoptosis repressor with caspase recruitment domain) are induced. Given that ARC can inhibit both apoptotic pathways as well as necrosis and attenuates UPR, we generated cHccs(+/-) embryos on an Arc knockout background (cHccs(+/-),Arc(-/-)). Surprisingly, the absence of ARC does not induce cell death in embryonic or postnatal HCCS deficient cardiomyocytes and adult cHccs(+/-),Arc(-/-) mice exhibit normal cardiac morphology and function. Taken together, our data demonstrate an impressive plasticity of embryonic cardiomyocytes to respond to metabolic stress, the loss of which might be involved in the high susceptibility of postnatal cardiomyocytes to cell death.
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Affiliation(s)
| | - Toni Pohl
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
| | - Anette Lill
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
| | - Herbert Schulz
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany; Cologne Center for Genomics, University of Cologne, Cologne, Germany
| | - Florian Blaschke
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany; Charité Universitätsmedizin Berlin, Campus Virchow Klinikum, Medizinische Klinik mit Schwerpunkt Kardiologie, Berlin, Germany
| | - Arnd Heuser
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
| | | | - Stefan Donath
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
| | - Jörg-Detlef Drenckhahn
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany; Department of Pediatric Cardiology, University Hospital Münster, Münster, Germany.
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Lucas A, Mialet-Perez J, Daviaud D, Parini A, Marber MS, Sicard P. Gadd45γ regulates cardiomyocyte death and post-myocardial infarction left ventricular remodelling. Cardiovasc Res 2015; 108:254-67. [PMID: 26370247 DOI: 10.1093/cvr/cvv219] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 09/08/2015] [Indexed: 11/13/2022] Open
Abstract
AIMS Post-infarction remodelling is accompanied and influenced by perturbations in mitogen-activated protein kinase (MAPK) signalling. The growth arrest and DNA-damage-inducible 45 (Gadd45) proteins are small acidic proteins involved in DNA repair and modulation of MAPK activity. Little is known about the role of Gadd45 in the heart. Here, we explored the potential contribution of Gadd45 gamma (γ) isoform to the acute and late phase of heart failure (HF) after myocardial infarction (MI) and determined the mechanisms underlying Gadd45γ actions. METHODS AND RESULTS The Gadd45γ isoform is up-regulated in murine cardiomyocytes subjected to simulated ischaemia and in the mouse heart during MI. To mimic the situation observed during MI, we enhanced Gadd45γ content in cardiomyocytes with a single injection of an adeno-associated viral (AAV9) vector encoding Gadd45γ under the cTNT promoter. Gadd45γ overexpression induces cardiomyocyte apoptosis, fibrosis, left ventricular dysfunction, and HF. On the other hand, genetic deletion of Gadd45γ in knockout mice confers resistance to ischaemic injury, at least in part by limiting cardiomyocyte apoptosis. Mechanistically, Gadd45γ activates receptor-interacting protein 1 (RIP1) and caspase-8 in a p38 MAPK-dependent manner to promote cardiomyocyte death. CONCLUSION This work is the first to demonstrate that Gadd45γ accumulation during MI promotes the development and persistence of HF by inducing cardiomyocyte apoptosis in a p38 MAPK-dependent manner. We clearly identify Gadd45γ as a therapeutic target in the development of HF.
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Affiliation(s)
- Alexandre Lucas
- INSERM, UMR-1048, Institute of Metabolic and Cardiovascular Diseases, 1 Avenue Jean Poulhes, 31432 Toulouse, France University Paul Sabatier, CHU of Toulouse, 31432 Toulouse, France
| | - Jeanne Mialet-Perez
- INSERM, UMR-1048, Institute of Metabolic and Cardiovascular Diseases, 1 Avenue Jean Poulhes, 31432 Toulouse, France University Paul Sabatier, CHU of Toulouse, 31432 Toulouse, France
| | - Danièle Daviaud
- INSERM, UMR-1048, Institute of Metabolic and Cardiovascular Diseases, 1 Avenue Jean Poulhes, 31432 Toulouse, France University Paul Sabatier, CHU of Toulouse, 31432 Toulouse, France
| | - Angelo Parini
- INSERM, UMR-1048, Institute of Metabolic and Cardiovascular Diseases, 1 Avenue Jean Poulhes, 31432 Toulouse, France University Paul Sabatier, CHU of Toulouse, 31432 Toulouse, France
| | - Michael S Marber
- Cardiovascular Division, King's College London, The Rayne Institute, St. Thomas' Hospital, London, UK
| | - Pierre Sicard
- INSERM, UMR-1048, Institute of Metabolic and Cardiovascular Diseases, 1 Avenue Jean Poulhes, 31432 Toulouse, France University Paul Sabatier, CHU of Toulouse, 31432 Toulouse, France
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15
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Zhang C, Shi J, Qian L, Zhang C, Wu K, Yang C, Yan D, Wu X, Liu X. Nucleostemin exerts anti-apoptotic function via p53 signaling pathway in cardiomyocytes. In Vitro Cell Dev Biol Anim 2015; 51:1064-71. [DOI: 10.1007/s11626-015-9934-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 06/14/2015] [Indexed: 12/15/2022]
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