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Zhu S, Chen Z, Liu C, Duong J, Tran T, Liang Z, Fang X, Ouyang K. The essential role of MED27 in stabilizing the mediator complex for cardiac development and function. Life Sci 2024; 356:123020. [PMID: 39209248 DOI: 10.1016/j.lfs.2024.123020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2024] [Revised: 08/15/2024] [Accepted: 08/25/2024] [Indexed: 09/04/2024]
Abstract
AIM Transcriptional regulation of gene expression plays a crucial role in orchestrating complex morphogenetic and molecular events during heart development and function. Mediator complex is an essential multi-subunit protein complex that governs gene expression in eukaryotic cells. Although Mediator subunits (MEDs) work integrally in the complex, individual MED component displays specialized functions. MED27, categorized as an Upper Tail subunit, possesses an as-yet-uncharacterized function. In this study, we aimed to investigate the physiological role of MED27 in cardiomyocytes. MATERIALS AND METHODS we generated a Med27 floxed mouse line, which was further used to generate constitutive (cKO) and inducible (icKO) cardiomyocyte-specific Med27 knockout mouse models. Morphological, histological analysis and cardiac physiological studies were performed in Med27 cKO and icKO mutants. Transcriptional profiles were determined by RNA sequencing (RNAseq) analysis. KEY FUNDINGS Ablation of MED27 in developing mouse cardiomyocytes results in embryonic lethality, while its deletion in adult cardiomyocytes leads to heart failure and mortality. Similar to the ablation of another Upper Tail subunit, MED30 in cardiomyocytes, deletion of MED27 leads to decreased protein levels of most MEDs in cardiomyocytes. Interestingly, overexpression of MED30 fails to restore the protein levels of Mediator subunits in MED27-deficient cardiomyocytes, demonstrating that the role of MED27 in maintaining the integrity and stability of the Mediator complex is independent of MED30. SIGNIFICANCE Our results revealed an essential role of MED27 in cardiac development and function by maintaining the stability of the Mediator core.
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Affiliation(s)
- Siting Zhu
- Department of Cardiovascular Surgery, Peking University Shenzhen Hospital, School of Chemical Biology and Biotechnology, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, China; Department of Medicine, University of California San Diego, La Jolla, California, USA
| | - Ze'e Chen
- Department of Cardiovascular Surgery, Peking University Shenzhen Hospital, School of Chemical Biology and Biotechnology, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, China; Department of Medicine, University of California San Diego, La Jolla, California, USA
| | - Canzhao Liu
- Department of Medicine, University of California San Diego, La Jolla, California, USA; Department of Cardiovascular Medicine, Translational Medicine Research Center, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Janelle Duong
- Department of Medicine, University of California San Diego, La Jolla, California, USA
| | - Tiana Tran
- Department of Medicine, University of California San Diego, La Jolla, California, USA
| | - Zhengyu Liang
- Department of Systems Biology, Southern University of Science and Technology, Shenzhen, China
| | - Xi Fang
- Department of Medicine, University of California San Diego, La Jolla, California, USA.
| | - Kunfu Ouyang
- Department of Cardiovascular Surgery, Peking University Shenzhen Hospital, School of Chemical Biology and Biotechnology, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, China.
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2
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Wu Y, Shi Z, Zhou X, Zhang P, Yang X, Ding J, Wu H. scHiCyclePred: a deep learning framework for predicting cell cycle phases from single-cell Hi-C data using multi-scale interaction information. Commun Biol 2024; 7:923. [PMID: 39085477 PMCID: PMC11291681 DOI: 10.1038/s42003-024-06626-3] [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: 10/30/2023] [Accepted: 07/24/2024] [Indexed: 08/02/2024] Open
Abstract
The emergence of single-cell Hi-C (scHi-C) technology has provided unprecedented opportunities for investigating the intricate relationship between cell cycle phases and the three-dimensional (3D) structure of chromatin. However, accurately predicting cell cycle phases based on scHi-C data remains a formidable challenge. Here, we present scHiCyclePred, a prediction model that integrates multiple feature sets to leverage scHi-C data for predicting cell cycle phases. scHiCyclePred extracts 3D chromatin structure features by incorporating multi-scale interaction information. The comparative analysis illustrates that scHiCyclePred surpasses existing methods such as Nagano_method and CIRCLET across various metrics including accuracy (ACC), F1 score, Precision, Recall, and balanced accuracy (BACC). In addition, we evaluate scHiCyclePred against the previously published CIRCLET using the dataset of complex tissues (Liu_dataset). Experimental results reveal significant improvements with scHiCyclePred exhibiting improvements of 0.39, 0.52, 0.52, and 0.39 over the CIRCLET in terms of ACC, F1 score, Precision, and Recall metrics, respectively. Furthermore, we conduct analyses on three-dimensional chromatin dynamics and gene features during the cell cycle, providing a more comprehensive understanding of cell cycle dynamics through chromatin structure. scHiCyclePred not only offers insights into cell biology but also holds promise for catalyzing breakthroughs in disease research. Access scHiCyclePred on GitHub at https:// github.com/HaoWuLab-Bioinformatics/ scHiCyclePred .
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Affiliation(s)
- Yingfu Wu
- School of Software, Shandong University, Jinan, Shandong, China
- Shenzhen Research Institute of Shandong University, Shenzhen, Guangdong, China
- College of Information Engineering, Northwest A&F University, Yangling, Shaanxi, China
| | - Zhenqi Shi
- School of Software, Shandong University, Jinan, Shandong, China
| | - Xiangfei Zhou
- School of Software, Shandong University, Jinan, Shandong, China
| | - Pengyu Zhang
- College of Information Engineering, Northwest A&F University, Yangling, Shaanxi, China
| | - Xiuhui Yang
- School of Software, Shandong University, Jinan, Shandong, China
| | - Jun Ding
- Department of Medicine, Meakins-Christie Laboratories, McGill University, Montreal, QC, Canada.
| | - Hao Wu
- School of Software, Shandong University, Jinan, Shandong, China.
- Shenzhen Research Institute of Shandong University, Shenzhen, Guangdong, China.
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3
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Yang J, Cheng C, Wu Z. Mechanisms underlying the therapeutic effects of cinobufagin in treating melanoma based on network pharmacology, single-cell RNA sequencing data, molecular docking, and molecular dynamics simulation. Front Pharmacol 2024; 14:1315965. [PMID: 38348352 PMCID: PMC10859445 DOI: 10.3389/fphar.2023.1315965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 12/31/2023] [Indexed: 02/15/2024] Open
Abstract
Malignant melanoma is one of the most aggressive of cancers; if not treated early, it can metastasize rapidly. Therefore, drug therapy plays an important role in the treatment of melanoma. Cinobufagin, an active ingredient derived from Venenum bufonis, can inhibit the growth and development of melanoma. However, the mechanism underlying its therapeutic effects is unclear. The purpose of this study was to predict the potential targets of cinobufagin in melanoma. We gathered known and predicted targets for cinobufagin from four online databases. Gene Ontology (GO) analysis and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis were then performed. Gene expression data were downloaded from the GSE46517 dataset, and differential gene expression analysis and weighted gene correlation network analysis were performed to identify melanoma-related genes. Using input melanoma-related genes and drug targets in the STRING online database and applying molecular complex detection (MCODE) analysis, we identified key targets that may be the potential targets of cinobufagin in melanoma. Moreover, we assessed the distribution of the pharmacological targets of cinobufagin in melanoma key clusters using single-cell data from the GSE215120 dataset obtained from the Gene Expression Omnibus database. The crucial targets of cinobufagin in melanoma were identified from the intersection of key clusters with melanoma-related genes and drug targets. Receiver operating characteristic curve (ROC) analysis, survival analysis, molecular docking, and molecular dynamics simulation were performed to gain further insights. Our findings suggest that cinobufagin may affect melanoma by arresting the cell cycle by inhibiting three protein tyrosine/serine kinases (EGFR, ERBB2, and CDK2). However, our conclusions are not supported by relevant experimental data and require further study.
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Affiliation(s)
- Jiansheng Yang
- Department of Dermatology, The Peoples Hospital of Yudu County, Ganzhou, China
| | - Chunchao Cheng
- Department of Neurosurgery, Tianjin Medical University General Hospital, Laboratory of Neuro-oncology, Tianjin Neurological Institute, Key Laboratory of Post-Neuro Injury Neuro-Repair and Regeneration in Central Nervous System, Ministry of Education, and Tianjin City, Tianjin, China
| | - Zhuolin Wu
- Department of Neurosurgery, Tianjin Medical University General Hospital, Laboratory of Neuro-oncology, Tianjin Neurological Institute, Key Laboratory of Post-Neuro Injury Neuro-Repair and Regeneration in Central Nervous System, Ministry of Education, and Tianjin City, Tianjin, China
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4
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Liu A, Xie H, Tian F, Bai P, Weng H, Liu Y, Liu W, Tang L, You H, Zhou N, Shu X. ESCRT-III Component CHMP4C Attenuates Cardiac Hypertrophy by Targeting the Endo-Lysosomal Degradation of EGFR. Hypertension 2023; 80:2674-2686. [PMID: 37846580 DOI: 10.1161/hypertensionaha.123.21427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Accepted: 10/04/2023] [Indexed: 10/18/2023]
Abstract
BACKGROUND Cardiac hypertrophy and subsequent heart failure impose a considerable burden on public health worldwide. Impaired protein degradation, especially endo-lysosome-mediated degradation of membrane proteins, is associated with cardiac hypertrophy progression. CHMP4C (charged multivesicular body protein 4C), a critical constituent of multivesicular bodies, is involved in cellular trafficking and signaling. However, the specific role of CHMP4C in the progression of cardiac hypertrophy remains largely unknown. METHODS Mouse models with CHMP4C knockout or cardiadc-specific overexpression were subjected to transverse aortic constriction surgery for 4 weeks. Cardiac morphology and function were assessed through histological staining and echocardiography. Confocal imaging and coimmunoprecipitation assays were performed to identify the direct target of CHMP4C. An EGFR (epidermal growth factor receptor) inhibitor was administrated to determine whether effects of CHMP4C on cardiac hypertrophy were EGFR dependent. RESULTS CHMP4C was significantly upregulated in both pressure-overloaded mice and spontaneously hypertensive rats. Compared with wild-type mice, CHMP4C deficiency exacerbated transverse aortic constriction-induced cardiac hypertrophy, whereas CHMP4C overexpression in cardiomyocytes attenuated cardiac dysfunction. Mechanistically, the effect of CHMP4C on cardiac hypertrophy relied on the EGFR signaling pathway. Fluorescent staining and coimmunoprecipitation assays confirmed that CHMP4C interacts directly with EGFR and promotes lysosome-mediated degradation of activated EGFR, thus attenuating cardiac hypertrophy. Notably, an EGFR inhibitor canertinib counteracted the exacerbation of cardiac hypertrophy induced by CHMP4C knockdown in vitro and in vivo. CONCLUSIONS CHMP4C represses cardiac hypertrophy by modulating lysosomal degradation of EGFR and is a potential therapeutic candidate for cardiac hypertrophy.
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Affiliation(s)
- Ao Liu
- Department of Echocardiography (A.L., H.X., F.T., H.W., Y.L., W.L., L.T., N.Z., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
- Department of Cardiology (A.L., H.X., P.B., H.W., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
| | - Huilin Xie
- Department of Echocardiography (A.L., H.X., F.T., H.W., Y.L., W.L., L.T., N.Z., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
- Department of Cardiology (A.L., H.X., P.B., H.W., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
| | - Fangyan Tian
- Department of Echocardiography (A.L., H.X., F.T., H.W., Y.L., W.L., L.T., N.Z., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
- Department of Ultrasound Medicine, The Affiliated Hospital of Guizhou Medical University, Guiyang, China (F.T.)
| | - Peiyuan Bai
- Department of Cardiology (A.L., H.X., P.B., H.W., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
| | - Haobo Weng
- Department of Echocardiography (A.L., H.X., F.T., H.W., Y.L., W.L., L.T., N.Z., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
- Department of Cardiology (A.L., H.X., P.B., H.W., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
| | - Yu Liu
- Department of Echocardiography (A.L., H.X., F.T., H.W., Y.L., W.L., L.T., N.Z., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
| | - Wen Liu
- Department of Echocardiography (A.L., H.X., F.T., H.W., Y.L., W.L., L.T., N.Z., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
| | - Lu Tang
- Department of Echocardiography (A.L., H.X., F.T., H.W., Y.L., W.L., L.T., N.Z., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
| | - Hongmin You
- Department of Cardiology, Changhai Hospital, Naval Medical University, Shanghai, China (H.Y.)
| | - Nianwei Zhou
- Department of Echocardiography (A.L., H.X., F.T., H.W., Y.L., W.L., L.T., N.Z., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
| | - Xianhong Shu
- Department of Echocardiography (A.L., H.X., F.T., H.W., Y.L., W.L., L.T., N.Z., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
- Department of Cardiology (A.L., H.X., P.B., H.W., X.S.), Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, China
- epartment of Echocardiography, Shanghai Xuhui District Central Hospital, China (X.S.)
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5
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Su D, Li Y, Zhang W, Gao H, Cheng Y, Hou Y, Li J, Ye Y, Lai Z, Li Z, Huang H, Li J, Li J, Cheng M, Nian C, Wu N, Zhou Z, Xing Y, Zhao Y, Liu H, Tang J, Chen Q, Hong L, Li W, Peng Z, Zhao B, Johnson RL, Liu P, Hong W, Chen L, Zhou D. SPTAN1/NUMB axis senses cell density to restrain cell growth and oncogenesis through Hippo signaling. J Clin Invest 2023; 133:e168888. [PMID: 37843276 PMCID: PMC10575737 DOI: 10.1172/jci168888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 08/22/2023] [Indexed: 10/17/2023] Open
Abstract
The loss of contact inhibition is a key step during carcinogenesis. The Hippo-Yes-associated protein (Hippo/YAP) pathway is an important regulator of cell growth in a cell density-dependent manner. However, how Hippo signaling senses cell density in this context remains elusive. Here, we report that high cell density induced the phosphorylation of spectrin α chain, nonerythrocytic 1 (SPTAN1), a plasma membrane-stabilizing protein, to recruit NUMB endocytic adaptor protein isoforms 1 and 2 (NUMB1/2), which further sequestered microtubule affinity-regulating kinases (MARKs) in the plasma membrane and rendered them inaccessible for phosphorylation and inhibition of the Hippo kinases sterile 20-like kinases MST1 and MST2 (MST1/2). WW45 interaction with MST1/2 was thereby enhanced, resulting in the activation of Hippo signaling to block YAP activity for cell contact inhibition. Importantly, low cell density led to SPTAN1 dephosphorylation and NUMB cytoplasmic location, along with MST1/2 inhibition and, consequently, YAP activation. Moreover, double KO of NUMB and WW45 in the liver led to appreciable organ enlargement and rapid tumorigenesis. Interestingly, NUMB isoforms 3 and 4, which have a truncated phosphotyrosine-binding (PTB) domain and are thus unable to interact with phosphorylated SPTAN1 and activate MST1/2, were selectively upregulated in liver cancer, which correlated with YAP activation. We have thus revealed a SPTAN1/NUMB1/2 axis that acts as a cell density sensor to restrain cell growth and oncogenesis by coupling external cell-cell contact signals to intracellular Hippo signaling.
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Affiliation(s)
- Dongxue Su
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Yuxi Li
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Weiji Zhang
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Huan Gao
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Yao Cheng
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Yongqiang Hou
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Junhong Li
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Yi Ye
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Zhangjian Lai
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Zhe Li
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Haitao Huang
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Jiaxin Li
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Jinhuan Li
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Mengyu Cheng
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Cheng Nian
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Na Wu
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Zhien Zhou
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Yunzhi Xing
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Yu Zhao
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - He Liu
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Jiayu Tang
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Qinghua Chen
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Lixin Hong
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
| | - Wengang Li
- Department of Hepatobiliary and Pancreatic and Organ Transplantation Surgery, Xiang’an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian, China
| | - Zhihai Peng
- Department of Hepatobiliary and Pancreatic and Organ Transplantation Surgery, Xiang’an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian, China
| | - Bin Zhao
- The MOE Key Laboratory of Biosystems Homeostasis and Protection, Zhejiang Provincial Key Laboratory for Cancer Molecular Cell Biology, and Innovation Center for Cell Signaling Network, Life Sciences Institute, Zhejiang University, Hangzhou, Zhejiang, China
| | - Randy L. Johnson
- Department of Cancer Biology, University of Texas, M.D. Anderson Cancer Center, Houston, Texas, USA
| | - Pingguo Liu
- Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma, Department of Hepatobiliary Surgery, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, Fujian, China
| | - Wanjin Hong
- Institute of Molecular and Cell Biology, Agency for Science, Technology, and Research (ASTAR), Singapore, Singapore
| | - Lanfen Chen
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
- Institute of Molecular and Cell Biology, Agency for Science, Technology, and Research (ASTAR), Singapore, Singapore
| | - Dawang Zhou
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and
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Zhang Y, Yang H, Liu W, Song Q, Li Y, Zhang J, Zhou D, Li A. Comprehensive pan-cancer analysis of expression profiles and prognostic significance for NUMB and NUMBL in human tumors. Medicine (Baltimore) 2023; 102:e34717. [PMID: 37657045 PMCID: PMC10476719 DOI: 10.1097/md.0000000000034717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 07/21/2023] [Indexed: 09/03/2023] Open
Abstract
NUMB has been initially identified as a critical cell fate determinant that modulates cell differentiation via asymmetrical partitioning during mitosis, including tumor cells. However, it remains absent that a systematic assessment of the mechanisms underlying NUMB and its homologous protein NUMBLIKE (NUMBL) involvement in cancer. This study aimed to investigate the prognostic significance for NUMB and NUMBL in pan-cancer. In this study, using the online databases TIMER2.0, gene expression profiling interactive analysis, cBioPortal, the University of ALabama at Birmingham CANcer data analysis Portal, SearchTool for the Retrieval of Interacting Genes/Proteins, and R software, we focused on the relevance between NUMB/NUMBL and oncogenesis, progression, mutation, phosphorylation, function and prognosis. This study demonstrated that abnormal expression of NUMB and NUMBL were found to be significantly associated with clinicopathologic stages and the prognosis of survival. Besides, genetic alternations of NUMB and NUMBL focused on uterine corpus endometrial carcinoma, and higher genetic mutations of NUMBL were correlated with more prolonged overall survival and disease-free survival in different cancers. Moreover, S438 locus of NUMB peptide fragment was frequently phosphorylated in 4 cancer types and relevant to its phosphorylation sites. Furthermore, endocytosis processing and neurogenesis regulation were involved in the functional mechanisms of NUMB and NUMBL separately. Additionally, the pathway enrichment suggested that NUMB was implicated in Hippo, Neurotrophin, Thyroid hormone, and FoxO pathways, while MAPK, Hippo, Rap1, mTOR, and Notch pathways were related to the functions of NUMBL. This study highlights the predictive roles of NUMB and NUMBL in pan-cancer, suggesting NUMB and NUMBL might be served as potential biomarkers for diagnosis and prognosis in various malignant tumors.
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Affiliation(s)
- Yue Zhang
- Department of Biochemistry and Molecular Biology, College of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei, China
- Hebei Higher Education Institute Applied Technology Research Center on TCM Formula Preparation, Shijiazhuang, Hebei, China
- Hebei Key Laboratory of Chinese Medicine Research on Cardio-Cerebrovascular Disease, Shijiazhuang, Hebei, China
| | - Hongxia Yang
- Department of Biochemistry and Molecular Biology, College of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei, China
- Department of Clinical Foundation of Chinese Medicine, College of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, China
| | - Weizhe Liu
- Department of Biochemistry and Molecular Biology, College of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei, China
- Hebei Higher Education Institute Applied Technology Research Center on TCM Formula Preparation, Shijiazhuang, Hebei, China
| | - Qiuhang Song
- Department of Biochemistry and Molecular Biology, College of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei, China
- Hebei Key Laboratory of Chinese Medicine Research on Cardio-Cerebrovascular Disease, Shijiazhuang, Hebei, China
| | - Yunfeng Li
- Department of Biochemistry and Molecular Biology, College of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei, China
- Hebei Key Laboratory of Chinese Medicine Research on Cardio-Cerebrovascular Disease, Shijiazhuang, Hebei, China
| | - Juanjuan Zhang
- Hebei Key Laboratory of Chinese Medicine Research on Cardio-Cerebrovascular Disease, Shijiazhuang, Hebei, China
| | - Dingyan Zhou
- Department of Biochemistry and Molecular Biology, College of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei, China
| | - Aiying Li
- Department of Biochemistry and Molecular Biology, College of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei, China
- Hebei Higher Education Institute Applied Technology Research Center on TCM Formula Preparation, Shijiazhuang, Hebei, China
- Hebei Key Laboratory of Chinese Medicine Research on Cardio-Cerebrovascular Disease, Shijiazhuang, Hebei, China
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7
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Vaparanta K, Jokilammi A, Paatero I, Merilahti JA, Heliste J, Hemanthakumar KA, Kivelä R, Alitalo K, Taimen P, Elenius K. STAT5b is a key effector of NRG-1/ERBB4-mediated myocardial growth. EMBO Rep 2023; 24:e56689. [PMID: 37009825 PMCID: PMC10157316 DOI: 10.15252/embr.202256689] [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: 12/18/2022] [Revised: 03/07/2023] [Accepted: 03/10/2023] [Indexed: 04/04/2023] Open
Abstract
The growth factor Neuregulin-1 (NRG-1) regulates myocardial growth and is currently under clinical investigation as a treatment for heart failure. Here, we demonstrate in several in vitro and in vivo models that STAT5b mediates NRG-1/EBBB4-stimulated cardiomyocyte growth. Genetic and chemical disruption of the NRG-1/ERBB4 pathway reduces STAT5b activation and transcription of STAT5b target genes Igf1, Myc, and Cdkn1a in murine cardiomyocytes. Loss of Stat5b also ablates NRG-1-induced cardiomyocyte hypertrophy. Dynamin-2 is shown to control the cell surface localization of ERBB4 and chemical inhibition of Dynamin-2 downregulates STAT5b activation and cardiomyocyte hypertrophy. In zebrafish embryos, Stat5 is activated during NRG-1-induced hyperplastic myocardial growth, and chemical inhibition of the Nrg-1/Erbb4 pathway or Dynamin-2 leads to loss of myocardial growth and Stat5 activation. Moreover, CRISPR/Cas9-mediated knockdown of stat5b results in reduced myocardial growth and cardiac function. Finally, the NRG-1/ERBB4/STAT5b signaling pathway is differentially regulated at mRNA and protein levels in the myocardium of patients with pathological cardiac hypertrophy as compared to control human subjects, consistent with a role of the NRG-1/ERBB4/STAT5b pathway in myocardial growth.
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Affiliation(s)
- Katri Vaparanta
- Turku Bioscience CentreUniversity of Turku and Åbo Akademi UniversityTurkuFinland
- Medicity Research LaboratoriesUniversity of TurkuTurkuFinland
- Institute of BiomedicineUniversity of TurkuTurkuFinland
| | - Anne Jokilammi
- Turku Bioscience CentreUniversity of Turku and Åbo Akademi UniversityTurkuFinland
- Medicity Research LaboratoriesUniversity of TurkuTurkuFinland
- Institute of BiomedicineUniversity of TurkuTurkuFinland
| | - Ilkka Paatero
- Turku Bioscience CentreUniversity of Turku and Åbo Akademi UniversityTurkuFinland
| | - Johannes A Merilahti
- Turku Bioscience CentreUniversity of Turku and Åbo Akademi UniversityTurkuFinland
| | - Juho Heliste
- Turku Bioscience CentreUniversity of Turku and Åbo Akademi UniversityTurkuFinland
- Medicity Research LaboratoriesUniversity of TurkuTurkuFinland
- Institute of BiomedicineUniversity of TurkuTurkuFinland
| | - Karthik Amudhala Hemanthakumar
- Wihuri Research InstituteHelsinkiFinland
- Translational Cancer Biology Program, Research Programs Unit, Faculty of MedicineUniversity of HelsinkiHelsinkiFinland
| | - Riikka Kivelä
- Wihuri Research InstituteHelsinkiFinland
- Translational Cancer Biology Program, Research Programs Unit, Faculty of MedicineUniversity of HelsinkiHelsinkiFinland
- Faculty of Sport and Health SciencesUniversity of JyväskyläJyväskyläFinland
| | - Kari Alitalo
- Wihuri Research InstituteHelsinkiFinland
- Translational Cancer Biology Program, Research Programs Unit, Faculty of MedicineUniversity of HelsinkiHelsinkiFinland
| | - Pekka Taimen
- Institute of Biomedicine and FICAN West Cancer CentreUniversity of TurkuTurkuFinland
- Department of PathologyTurku University HospitalTurkuFinland
| | - Klaus Elenius
- Turku Bioscience CentreUniversity of Turku and Åbo Akademi UniversityTurkuFinland
- Medicity Research LaboratoriesUniversity of TurkuTurkuFinland
- Institute of BiomedicineUniversity of TurkuTurkuFinland
- Department of OncologyTurku University HospitalTurkuFinland
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8
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Shakked A, Petrover Z, Aharonov A, Ghiringhelli M, Umansky KB, Kain D, Elkahal J, Divinsky Y, Nguyen PD, Miyara S, Friedlander G, Savidor A, Zhang L, Perez DE, Sarig R, Lendengolts D, Bueno-Levy H, Kastan N, Levin Y, Bakkers J, Gepstein L, Tzahor E. Redifferentiated cardiomyocytes retain residual dedifferentiation signatures and are protected against ischemic injury. NATURE CARDIOVASCULAR RESEARCH 2023; 2:383-398. [PMID: 37974970 PMCID: PMC10653068 DOI: 10.1038/s44161-023-00250-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 02/09/2023] [Indexed: 11/19/2023]
Abstract
Cardiomyocyte proliferation and dedifferentiation have fueled the field of regenerative cardiology in recent years, whereas the reverse process of redifferentiation remains largely unexplored. Redifferentiation is characterized by the restoration of function lost during dedifferentiation. Previously, we showed that ERBB2-mediated heart regeneration has these two distinct phases: transient dedifferentiation and redifferentiation. Here we survey the temporal transcriptomic and proteomic landscape of dedifferentiation-redifferentiation in adult mouse hearts and reveal that well-characterized dedifferentiation features largely return to normal, although elements of residual dedifferentiation remain, even after the contractile function is restored. These hearts appear rejuvenated and show robust resistance to ischemic injury, even 5 months after redifferentiation initiation. Cardiomyocyte redifferentiation is driven by negative feedback signaling and requires LATS1/2 Hippo pathway activity. Our data reveal the importance of cardiomyocyte redifferentiation in functional restoration during regeneration but also protection against future insult, in what could lead to a potential prophylactic treatment against ischemic heart disease for at-risk patients.
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Affiliation(s)
- Avraham Shakked
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Zachary Petrover
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Alla Aharonov
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Matteo Ghiringhelli
- Sohnis Research Laboratory for Cardiac Electrophysiology and Regenerative Medicine Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, Israel
| | - Kfir-Baruch Umansky
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - David Kain
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Jacob Elkahal
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Yalin Divinsky
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Phong Dang Nguyen
- Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, The Netherlands
| | - Shoval Miyara
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Gilgi Friedlander
- Mantoux Bioinformatics Institute of the Nancy and Stephen Grand Israel National Center for Personalized Medicine, Weizmann Institute of Science, Rehovot, Israel
| | - Alon Savidor
- De Botton Protein Profiling Institute of the Nancy and Stephen Grand Israel National Center for Personalized Medicine, Weizmann Institute of Science, Rehovot, Israel
| | - Lingling Zhang
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Dahlia E. Perez
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Rachel Sarig
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Daria Lendengolts
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Hanna Bueno-Levy
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Nathaniel Kastan
- Howard Hughes Medical Institute and Laboratory of Sensory Neuroscience, The Rockefeller University, New York, NY, USA
| | - Yishai Levin
- De Botton Protein Profiling Institute of the Nancy and Stephen Grand Israel National Center for Personalized Medicine, Weizmann Institute of Science, Rehovot, Israel
| | - Jeroen Bakkers
- Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, The Netherlands
| | - Lior Gepstein
- Sohnis Research Laboratory for Cardiac Electrophysiology and Regenerative Medicine Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, Israel
| | - Eldad Tzahor
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
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9
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Liu H, Duan R, He X, Qi J, Xing T, Wu Y, Zhou L, Wang L, Shao Y, Zhang F, Zhou H, Gu X, Lin B, Liu Y, Wang Y, Liu Y, Li L, Liang D, Chen YH. Endothelial deletion of PTBP1 disrupts ventricular chamber development. Nat Commun 2023; 14:1796. [PMID: 37002228 PMCID: PMC10066379 DOI: 10.1038/s41467-023-37409-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 03/16/2023] [Indexed: 04/03/2023] Open
Abstract
The growth and maturation of the ventricular chamber require spatiotemporally precise synergy between diverse cell types. Alternative splicing deeply affects the processes. However, the functional properties of alternative splicing in cardiac development are largely unknown. Our study reveals that an alternative splicing factor polypyrimidine tract-binding protein 1 (PTBP1) plays a key role in ventricular chamber morphogenesis. During heart development, PTBP1 colocalizes with endothelial cells but is almost undetectable in cardiomyocytes. The endothelial-specific knockout of Ptbp1, in either endocardial cells or pan-endothelial cells, leads to a typical phenotype of left ventricular noncompaction (LVNC). Mechanistically, the deletion of Ptbp1 reduces the migration of endothelial cells, disrupting cardiomyocyte proliferation and ultimately leading to the LVNC. Further study shows that Ptbp1 deficiency changes the alternative splicing of β-arrestin-1 (Arrb1), which affects endothelial cell migration. In conclusion, as an alternative splicing factor, PTBP1 is essential during ventricular chamber development, and its deficiency can lead to congenital heart disease.
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Affiliation(s)
- Hongyu Liu
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Ran Duan
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Xiaoyu He
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Jincu Qi
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Tianming Xing
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Jinzhou Medical University, 121000, Jinzhou, Liaoning, China
| | - Yahan Wu
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Liping Zhou
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Lingling Wang
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Yujing Shao
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Fulei Zhang
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Huixing Zhou
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Xingdong Gu
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Jinzhou Medical University, 121000, Jinzhou, Liaoning, China
| | - Bowen Lin
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Yuanyuan Liu
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Jinzhou Medical University, 121000, Jinzhou, Liaoning, China
| | - Yan Wang
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Jinzhou Medical University, 121000, Jinzhou, Liaoning, China
| | - Yi Liu
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
| | - Li Li
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China
- Research Units of Origin and Regulation of Heart Rhythm, Chinese Academy of Medical Sciences, 200092, Shanghai, China
- Department of Pathology and Pathophysiology, Tongji University School of Medicine, 200092, Shanghai, China
| | - Dandan Liang
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China.
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China.
- Research Units of Origin and Regulation of Heart Rhythm, Chinese Academy of Medical Sciences, 200092, Shanghai, China.
| | - Yi-Han Chen
- Department of Cardiology, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China.
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, 200120, Shanghai, China.
- Research Units of Origin and Regulation of Heart Rhythm, Chinese Academy of Medical Sciences, 200092, Shanghai, China.
- Department of Pathology and Pathophysiology, Tongji University School of Medicine, 200092, Shanghai, China.
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10
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Basavarajappa HD, Irimia JM, Bauer BM, Fueger PT. The Adaptor Protein NumbL Is Involved in the Control of Glucolipotoxicity-Induced Pancreatic Beta Cell Apoptosis. Int J Mol Sci 2023; 24:ijms24043308. [PMID: 36834720 PMCID: PMC9959170 DOI: 10.3390/ijms24043308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 01/30/2023] [Accepted: 02/01/2023] [Indexed: 02/10/2023] Open
Abstract
Avoiding the loss of functional beta cell mass is critical for preventing or treating diabetes. Currently, the molecular mechanisms underlying beta cell death are partially understood, and there is a need to identify new targets for developing novel therapeutics to treat diabetes. Previously, our group established that Mig6, an inhibitor of EGF signaling, mediates beta cell death under diabetogenic conditions. The objective here was to clarify the mechanisms linking diabetogenic stimuli to beta cell death by investigating Mig6-interacting proteins. Using co-immunoprecipitation and mass spectrometry, we evaluated the binding partners of Mig6 under both normal glucose (NG) and glucolipotoxic (GLT) conditions in beta cells. We identified that Mig6 interacted dynamically with NumbL, whereas Mig6 associated with NumbL under NG, and this interaction was disrupted under GLT conditions. Further, we demonstrated that the siRNA-mediated suppression of NumbL expression in beta cells prevented apoptosis under GLT conditions by blocking the activation of NF-κB signaling. Using co-immunoprecipitation experiments, we observed that NumbL's interactions with TRAF6, a key component of NFκB signaling, were increased under GLT conditions. The interactions among Mig6, NumbL, and TRAF6 were dynamic and context-dependent. We proposed a model wherein these interactions activated pro-apoptotic NF-κB signaling while blocking pro-survival EGF signaling under diabetogenic conditions, leading to beta cell apoptosis. These findings indicated that NumbL should be further investigated as a candidate anti-diabetic therapeutic target.
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Affiliation(s)
- Halesha D. Basavarajappa
- Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Jose M. Irimia
- Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA 91010, USA
- Comprehensive Metabolic Phenotyping Core, Beckman Research Institute, City of Hope, 1500 E. Duarte Rd., Duarte, CA 91010, USA
| | - Brandon M. Bauer
- Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Patrick T. Fueger
- Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA 91010, USA
- Comprehensive Metabolic Phenotyping Core, Beckman Research Institute, City of Hope, 1500 E. Duarte Rd., Duarte, CA 91010, USA
- Correspondence: ; Tel.: +1-626-218-0620
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11
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Lacomme M, Hales SC, Brown TW, Stevanovic K, Jolicoeur C, Cai J, Bois T, Desrosiers M, Dalkara D, Cayouette M. Numb regulates Tau levels and prevents neurodegeneration in tauopathy mouse models. SCIENCE ADVANCES 2022; 8:eabm4295. [PMID: 36260685 PMCID: PMC9581485 DOI: 10.1126/sciadv.abm4295] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 09/07/2022] [Indexed: 06/01/2023]
Abstract
Accumulation of the microtubule-associated protein Tau is linked to neuronal cell death in tauopathies, but how intraneuronal Tau levels are regulated in health and disease remains unclear. Here, we show that conditional inactivation of the trafficking adaptor protein Numb in retinal ganglion cells (RGCs) increases Tau levels and leads to axonal blebbing, which is followed by neuronal cell loss in aged mice. In the TauP301S mouse model of tauopathy, conditional inactivation of Numb in RGCs and spinal motoneurons accelerates neurodegeneration, and loss of Numb in motoneurons also leads to precocious hindlimb paralysis. Conversely, overexpression of the long isoform of Numb (Numb-72) decreases intracellular Tau levels and reduces axonal blebbing in TauP301S RGCs, leading to improved electrical activity in cultured neurons and improves performance in a visually guided behavior test in vivo. These results uncover Numb as a key regulator of intracellular Tau levels and identify Numb-72 as a potential therapeutic factor for tauopathies.
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Affiliation(s)
- Marine Lacomme
- Cellular Neurobiology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Montreal, QC H2W 1R7, Canada
| | - Sarah C. Hales
- Cellular Neurobiology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Montreal, QC H2W 1R7, Canada
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
| | - Thomas W. Brown
- Cellular Neurobiology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Montreal, QC H2W 1R7, Canada
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
| | - Katarina Stevanovic
- Cellular Neurobiology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Montreal, QC H2W 1R7, Canada
| | - Christine Jolicoeur
- Cellular Neurobiology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Montreal, QC H2W 1R7, Canada
| | - Jenny Cai
- Cellular Neurobiology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Montreal, QC H2W 1R7, Canada
| | - Therence Bois
- Cellular Neurobiology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Montreal, QC H2W 1R7, Canada
| | - Melissa Desrosiers
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France
| | - Deniz Dalkara
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France
| | - Michel Cayouette
- Cellular Neurobiology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Montreal, QC H2W 1R7, Canada
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
- Department of Medicine, Université de Montréal, Montreal, QC H3T 1J4, Canada
- Department of Anatomy and Cell Biology, Division of Experimental Medicine, McGill University, Montreal, QC H3A 0G4, Canada
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12
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Hirono K, Ichida F. Left ventricular noncompaction: a disorder with genotypic and phenotypic heterogeneity-a narrative review. Cardiovasc Diagn Ther 2022; 12:495-515. [PMID: 36033229 PMCID: PMC9412206 DOI: 10.21037/cdt-22-198] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 07/21/2022] [Indexed: 01/10/2023]
Abstract
Background and Objective Left ventricular noncompaction (LVNC) is a cardiomyopathy characterized by excessive trabecular formation and deep recesses in the ventricular wall, with a bilaminar structure consisting of an endocardial noncompaction layer and an epicardial compacted layer. Although genetic variants have been reported in patients with LVNC, understanding of LVNC and its pathogenesis has not yet been fully elucidated. We addressed the latest findings on genes reported to be associated with LVNC morphogenesis and possible pathologies to understand the diverse spectrum between genotype and phenotype in LVNC. Also, the latest findings and issues related to the diagnosis of LVNC were summarized. Methods This article is written as a commentary narrative review and will provide an update on the current literature and available data on common forms of LVNC published in the past 30 years in English through to May 2022 using PubMed. Key Content and Findings Familial forms of LVNC are frequent, and autosomal dominant mode of inheritance has been predominantly observed. Several of the candidate causative genes are also mutated in other cardiomyopathies, suggesting a possible shared molecular and/or cellular etiology. The most common gene functions were sarcomere function whereas genes in mice LVNC models were involved in heart development. Echocardiography and cardiac magnetic resonance imaging (CMR) are useful for diagnosis although there are no unified criteria due to overdiagnosis of imaging, poor consistency between techniques, and lack of association between trabecular severity and adverse clinical outcomes. Conclusions This review reflects the current lack of clarity regarding the pathogenesis and significance of LVNC and showed the complexity of imaging diagnostic criteria, interpretation of the role of LVNC as a cause, and uncertainty regarding the specific genetic basis of LVNC.
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Affiliation(s)
- Keiichi Hirono
- Department of Pediatrics, Graduate School of Medicine, University of Toyama, Toyama, Japan
| | - Fukiko Ichida
- Department of Pediatrics, International University of Health and Welfare, Tokyo, Japan
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13
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Dhamodaran K, Baidouri H, Nartey A, Staverosky J, Keller K, Acott T, Vranka J, Raghunathan V. Endogenous expression of Notch pathway molecules in human trabecular meshwork cells. Exp Eye Res 2022; 216:108935. [PMID: 35033558 PMCID: PMC8885976 DOI: 10.1016/j.exer.2022.108935] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/23/2021] [Accepted: 01/05/2022] [Indexed: 11/25/2022]
Abstract
PURPOSE Cells in the trabecular meshwork sense and respond to a myriad of physical forces through a process known as mechanotransduction. Whilst the effect of substratum stiffness or stretch on TM cells have been investigated in the context of transforming growth factor (TGF-β), Wnt and YAP/TAZ pathways, the role of Notch signaling, an evolutionarily conserved pathway, recently implicated in mechanotransduction, has not been investigated in trabecular meshwork (TM) cells. Here, we compare the endogenous expression of Notch pathway molecules in TM cells from glaucomatous and non-glaucomatous donors, segmental flow regions, and when subjected to cyclical strain, or grown on hydrogels of varying rigidity. METHODS Primary TM from glaucomatous (GTM), non-glaucomatous (NTM) donors, and from segmental flow regions [high flow (HF), low flow (LF)], were utilized between passages 2-6. Cells were (i) plated on tissue culture plastic, (ii) subjected to cyclical strain (6 h and 24 h), or (iii) cultured on 3 kPa and 80 kPa hydrogels. mRNA levels of Notch receptors/ligands/effectors in the TM cells was determined by qRT-PCR. Phagocytosis was determined as a function of substratum stiffness in NTM-HF/LF cells in the presence or absence of 100 nM Dexamethasone treatment. RESULTS Innate expression of Notch pathway genes were significantly overexpressed in GTM cells with no discernible differences observed between HF/LF cells in either NTM or GTM cells cultured on plastic substrates. With 6 h of cyclical strain, a subset of Notch pathway genes presented with altered expression. Expression of Notch receptors/ligands/receptors/inhibitors progressively declined with increasing stiffness and this correlated with phagocytic ability of NTM cells. Dexamethasone treatment decreased phagocytosis regardless of stiffness or cells isolated from segmental outflow regions. CONCLUSIONS We demonstrate here that the Notch expression in cultured TM cells differ intrinsically between GTM vs NTM, and by substratum cues (cyclical strain and stiffness). Of import, the most apparent differences in gene expression were observed as a function of substratum stiffness which closely followed phagocytic ability of cells. Interestingly, on soft substrates (mimicking normal TM stiffness) Notch expression and phagocytosis was highest, while both expression and phagocytosis was significantly lower on stiffer substrates (mimicking glaucomatous stiffness) regardless of DEX treatment. Such context dependent changes suggest Notch pathway may play differing roles in disease vs homeostasis. Studies focused on understanding the mechanistic role of Notch (if any) in outflow homeostasis are thus warranted.
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Affiliation(s)
- Kamesh Dhamodaran
- Department of Basic Sciences, College of Optometry, University of Houston, Houston, TX, USA
| | - Hasna Baidouri
- Department of Basic Sciences, College of Optometry, University of Houston, Houston, TX, USA
| | - Andrews Nartey
- Department of Basic Sciences, College of Optometry, University of Houston, Houston, TX, USA
| | - Julia Staverosky
- Casey Eye Institute, Oregon Health and Sciences University, Portland, OR, USA
| | - Kate Keller
- Casey Eye Institute, Oregon Health and Sciences University, Portland, OR, USA
| | - Ted Acott
- Casey Eye Institute, Oregon Health and Sciences University, Portland, OR, USA
| | - Janice Vranka
- Casey Eye Institute, Oregon Health and Sciences University, Portland, OR, USA
| | - VijayKrishna Raghunathan
- Department of Basic Sciences, College of Optometry, University of Houston, Houston, TX, USA,Department of Biomedical Engineering, University of Houston, Houston, TX, USA,Correspondence should be sent to: VijayKrishna Raghunathan, Ph.D., University of Houston, College of Optometry, 4901 Calhoun Rd, Houston, TX, 77204, Phone: (713)-743-8331,
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14
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Wu T, Liang Z, Zhang Z, Liu C, Zhang L, Gu Y, Peterson KL, Evans SM, Fu XD, Chen J. PRDM16 Is a Compact Myocardium-Enriched Transcription Factor Required to Maintain Compact Myocardial Cardiomyocyte Identity in Left Ventricle. Circulation 2022; 145:586-602. [PMID: 34915728 PMCID: PMC8860879 DOI: 10.1161/circulationaha.121.056666] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 10/29/2021] [Indexed: 01/28/2023]
Abstract
BACKGROUND Left ventricular noncompaction cardiomyopathy (LVNC) was discovered half a century ago as a cardiomyopathy with excessive trabeculation and a thin ventricular wall. In the decades since, numerous studies have demonstrated that LVNC primarily has an effect on left ventricles (LVs) and is often associated with LV dilation and dysfunction. However, in part because of the lack of suitable mouse models that faithfully mirror the selective LV vulnerability in patients, mechanisms underlying the susceptibility of LVs to dilation and dysfunction in LVNC remain unknown. Genetic studies have revealed that deletions and mutations in PRDM16 (PR domain-containing 16) cause LVNC, but previous conditional Prdm16 knockout mouse models do not mirror the LVNC phenotype in patients, and the underlying molecular mechanisms by which PRDM16 deficiency causes LVNC are still unclear. METHODS Prdm16 cardiomyocyte-specific knockout (Prdm16cKO) mice were generated and analyzed for cardiac phenotypes. RNA sequencing and chromatin immunoprecipitation deep sequencing were performed to identify direct transcriptional targets of PRDM16 in cardiomyocytes. Single-cell RNA sequencing in combination with spatial transcriptomics was used to determine cardiomyocyte identity at the single-cell level. RESULTS Cardiomyocyte-specific ablation of Prdm16 in mice caused LV-specific dilation and dysfunction, as well as biventricular noncompaction, which fully recapitulated LVNC in patients. PRDM16 functioned mechanistically as a compact myocardium-enriched transcription factor that activated compact myocardial genes while repressing trabecular myocardial genes in LV compact myocardium. Consequently, Prdm16cKO LV compact myocardial cardiomyocytes shifted from their normal transcriptomic identity to a transcriptional signature resembling trabecular myocardial cardiomyocytes or neurons. Chamber-specific transcriptional regulation by PRDM16 was attributable in part to its cooperation with LV-enriched transcription factors Tbx5 and Hand1. CONCLUSIONS These results demonstrate that disruption of proper specification of compact cardiomyocytes may play a key role in the pathogenesis of LVNC. They also shed light on underlying mechanisms of the LV-restricted transcriptional program governing LV chamber growth and maturation, providing a tangible explanation for the susceptibility of LV in a subset of LVNC cardiomyopathies.
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Affiliation(s)
- Tongbin Wu
- Department of Medicine, University of California San Diego, La Jolla, CA
- These authors contributed equally
| | - Zhengyu Liang
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA
- These authors contributed equally
| | - Zengming Zhang
- Department of Medicine, University of California San Diego, La Jolla, CA
| | - Canzhao Liu
- Department of Medicine, University of California San Diego, La Jolla, CA
| | - Lunfeng Zhang
- Department of Pharmacology, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA
| | - Yusu Gu
- Department of Medicine, University of California San Diego, La Jolla, CA
| | - Kirk L. Peterson
- Department of Medicine, University of California San Diego, La Jolla, CA
| | - Sylvia M. Evans
- Department of Medicine, University of California San Diego, La Jolla, CA
- Department of Pharmacology, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA
| | - Xiang-Dong Fu
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA
- Institute of Genomic Medicine, University of California San Diego, La Jolla, CA
| | - Ju Chen
- Department of Medicine, University of California San Diego, La Jolla, CA
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15
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Shen Y, Wang X, Liu Y, Singhal M, Gürkaşlar C, Valls AF, Lei Y, Hu W, Schermann G, Adler H, Yu FX, Fischer T, Zhu Y, Augustin HG, Schmidt T, de Almodóvar CR. STAT3-YAP/TAZ signaling in endothelial cells promotes tumor angiogenesis. Sci Signal 2021; 14:eabj8393. [PMID: 34874746 DOI: 10.1126/scisignal.abj8393] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Ying Shen
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.,Department of General, Visceral and Transplantation Surgery, University Hospital Heidelberg, University of Heidelberg, 69120 Heidelberg, Germany
| | - Xiaohong Wang
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.,Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, Laboratory of Molecular Ophthalmology, The Province and Ministry Co-Sponsored Collaborative Innovation Center for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
| | - Yi Liu
- Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, Laboratory of Molecular Ophthalmology, The Province and Ministry Co-Sponsored Collaborative Innovation Center for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
| | - Mahak Singhal
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.,Division of Vascular Oncology and Metastasis, German Cancer Research Center (DKFZ-ZMBH Alliance), 69120 Heidelberg, Germany
| | - Can Gürkaşlar
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
| | - Aida Freire Valls
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.,Department of General, Visceral and Transplantation Surgery, University Hospital Heidelberg, University of Heidelberg, 69120 Heidelberg, Germany
| | - Yi Lei
- Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, Laboratory of Molecular Ophthalmology, The Province and Ministry Co-Sponsored Collaborative Innovation Center for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, 300070 Tianjin, China
| | - Wenjie Hu
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
| | - Géza Schermann
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
| | - Heike Adler
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
| | - Fa-Xing Yu
- Institute of Pediatrics, Children's Hospital of Fudan University and the Shanghai Key Laboratory of Medical Epigenetics, Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, 200030 Shanghai, China
| | - Tamás Fischer
- Genome Biology Department, The John Curtin School of Medical Research, Australian National University, Garran Rd, Canberra, ACT 2601, Australia
| | - Yi Zhu
- Department of physiology and pathophysiology, Tianjin Medical University, 300070 Tianjin, China
| | - Hellmut G Augustin
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.,Division of Vascular Oncology and Metastasis, German Cancer Research Center (DKFZ-ZMBH Alliance), 69120 Heidelberg, Germany
| | - Thomas Schmidt
- Department of General, Visceral and Transplantation Surgery, University Hospital Heidelberg, University of Heidelberg, 69120 Heidelberg, Germany.,Department of General, Visceral, Cancer and Transplantation Surgery, University Hospital of Cologne, 50924 Köln, Germany
| | - Carmen Ruiz de Almodóvar
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
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16
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Tan C, Zhu S, Chen Z, Liu C, Li YE, Zhu M, Zhang Z, Zhang Z, Zhang L, Gu Y, Liang Z, Boyer TG, Ouyang K, Evans SM, Fang X. Mediator complex proximal Tail subunit MED30 is critical for Mediator core stability and cardiomyocyte transcriptional network. PLoS Genet 2021; 17:e1009785. [PMID: 34506481 PMCID: PMC8432849 DOI: 10.1371/journal.pgen.1009785] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 08/18/2021] [Indexed: 01/28/2023] Open
Abstract
Dysregulation of cardiac transcription programs has been identified in patients and families with heart failure, as well as those with morphological and functional forms of congenital heart defects. Mediator is a multi-subunit complex that plays a central role in transcription initiation by integrating regulatory signals from gene-specific transcriptional activators to RNA polymerase II (Pol II). Recently, Mediator subunit 30 (MED30), a metazoan specific Mediator subunit, has been associated with Langer-Giedion syndrome (LGS) Type II and Cornelia de Lange syndrome-4 (CDLS4), characterized by several abnormalities including congenital heart defects. A point mutation in MED30 has been identified in mouse and is associated with mitochondrial cardiomyopathy. Very recent structural analyses of Mediator revealed that MED30 localizes to the proximal Tail, anchoring Head and Tail modules, thus potentially influencing stability of the Mediator core. However, in vivo cellular and physiological roles of MED30 in maintaining Mediator core integrity remain to be tested. Here, we report that deletion of MED30 in embryonic or adult cardiomyocytes caused rapid development of cardiac defects and lethality. Importantly, cardiomyocyte specific ablation of MED30 destabilized Mediator core subunits, while the kinase module was preserved, demonstrating an essential role of MED30 in stability of the overall Mediator complex. RNAseq analyses of constitutive cardiomyocyte specific Med30 knockout (cKO) embryonic hearts and inducible cardiomyocyte specific Med30 knockout (icKO) adult cardiomyocytes further revealed critical transcription networks in cardiomyocytes controlled by Mediator. Taken together, our results demonstrated that MED30 is essential for Mediator stability and transcriptional networks in both developing and adult cardiomyocytes. Our results affirm the key role of proximal Tail modular subunits in maintaining core Mediator stability in vivo.
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Affiliation(s)
- Changming Tan
- Department of Medicine, University of California, San Diego, California, United States of America
- Department of Cardiovascular Surgery, the Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Siting Zhu
- Department of Medicine, University of California, San Diego, California, United States of America
- Department of Cardiovascular Surgery, Peking University Shenzhen Hospital, School of Chemical Biology and Biotechnology, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Zee Chen
- Department of Medicine, University of California, San Diego, California, United States of America
- Department of Cardiovascular Surgery, Peking University Shenzhen Hospital, School of Chemical Biology and Biotechnology, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Canzhao Liu
- Department of Medicine, University of California, San Diego, California, United States of America
| | - Yang E. Li
- Department of Medicine, University of California, San Diego, California, United States of America
| | - Mason Zhu
- Department of Medicine, University of California, San Diego, California, United States of America
| | - Zhiyuan Zhang
- Department of Medicine, University of California, San Diego, California, United States of America
- Department of Cardiovascular Surgery, the Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Zhiwei Zhang
- Department of Medicine, University of California, San Diego, California, United States of America
- Department of Cardiovascular Surgery, the Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Lunfeng Zhang
- Department of Medicine, University of California, San Diego, California, United States of America
| | - Yusu Gu
- Department of Medicine, University of California, San Diego, California, United States of America
| | - Zhengyu Liang
- Department of Medicine, University of California, San Diego, California, United States of America
| | - Thomas G. Boyer
- Department of Molecular Medicine, University of Texas Health Science Center, San Antonio, Texas, United States of America
| | - Kunfu Ouyang
- Department of Cardiovascular Surgery, Peking University Shenzhen Hospital, School of Chemical Biology and Biotechnology, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Sylvia M. Evans
- Department of Medicine, University of California, San Diego, California, United States of America
- Department of Pharmacology, University of California, San Diego, California, United States of America
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, California, United States of America
| | - Xi Fang
- Department of Medicine, University of California, San Diego, California, United States of America
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17
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The Spatiotemporal Expression of Notch1 and Numb and Their Functional Interaction during Cardiac Morphogenesis. Cells 2021; 10:cells10092192. [PMID: 34571841 PMCID: PMC8471136 DOI: 10.3390/cells10092192] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 08/18/2021] [Accepted: 08/21/2021] [Indexed: 12/13/2022] Open
Abstract
Numb family proteins (NFPs), including Numb and Numblike (Numbl), are commonly known for their role as cell fate determinants for multiple types of progenitor cells, mainly due to their function as Notch inhibitors. Previous studies have shown that myocardial NFP double knockout (MDKO) hearts display an up-regulated Notch activation and various defects in cardiac progenitor cell differentiation and cardiac morphogenesis. Whether enhanced Notch activation causes these defects in MDKO is not fully clear. To answer the question, we examined the spatiotemporal patterns of Notch1 expression, Notch activation, and Numb expression in the murine embryonic hearts using multiple approaches including RNAScope, and Numb and Notch reporter mouse lines. To further interrogate the interaction between NFPs and Notch signaling activation, we deleted both Notch1 or RBPJk alleles in the MDKO. We examined and compared the phenotypes of Notch1 knockout, NFPs double knockout, Notch1; Numb; Numbl and RBPJk; Numb; Numbl triple knockouts. Our study showed that Notch1 is expressed and activated in the myocardium at several stages, and Numb is enriched in the epicardium and did not show the asymmetric distribution in the myocardium. Cardiac-specific Notch1 deletion causes multiple structural defects and embryonic lethality. Notch1 or RBPJk deletion in MDKO did not rescue the structural defects in the MDKO but partially rescued the defects of cardiac progenitor cell differentiation, cardiomyocyte proliferation, and trabecular morphogenesis. Our study concludes that NFPs regulate progenitor cell differentiation, cardiomyocyte proliferation, and trabecular morphogenesis partially through Notch1 and play more roles than inhibiting Notch1 signaling during cardiac morphogenesis.
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18
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BioID-Screening Identifies PEAK1 and SHP2 as Components of the ALK Proximitome in Neuroblastoma Cells. J Mol Biol 2021; 433:167158. [PMID: 34273398 DOI: 10.1016/j.jmb.2021.167158] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 06/11/2021] [Accepted: 07/08/2021] [Indexed: 01/04/2023]
Abstract
Anaplastic lymphoma kinase (ALK) is a receptor tyrosine kinase (RTK) that is mutated in approximately 10% of pediatric neuroblastoma (NB). To shed light on ALK-driven signaling processes, we employed BioID-based in vivo proximity labeling to identify molecules that interact intracellularly with ALK. NB-derived SK-N-AS and SK-N-BE(2) cells expressing inducible ALK-BirA* fusion proteins were generated and stimulated with ALKAL ligands in the presence and absence of the ALK tyrosine kinase inhibitor (TKI) lorlatinib. LC/MS-MS analysis identified multiple proteins, including PEAK1 and SHP2, which were validated as ALK interactors in NB cells. Further analysis of the ALK-SHP2 interaction confirmed that the ALK-SHP2 interaction as well as SHP2-Y542 phosphorylation was dependent on ALK activation. Use of the SHP2 inhibitors, SHP099 and RMC-4550, resulted in inhibition of cell growth in ALK-driven NB cells. In addition, we noted a strong synergistic effect of combined ALK and SHP2 inhibition that was specific to ALK-driven NB cells, suggesting a potential therapeutic option for ALK-driven NB.
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19
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ERBB2 drives YAP activation and EMT-like processes during cardiac regeneration. Nat Cell Biol 2020; 22:1346-1356. [PMID: 33046882 DOI: 10.1038/s41556-020-00588-4] [Citation(s) in RCA: 124] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 09/01/2020] [Indexed: 01/06/2023]
Abstract
Cardiomyocyte loss after injury results in adverse remodelling and fibrosis, inevitably leading to heart failure. The ERBB2-Neuregulin and Hippo-YAP signalling pathways are key mediators of heart regeneration, yet the crosstalk between them is unclear. We demonstrate that transient overexpression of activated ERBB2 in cardiomyocytes (OE CMs) promotes cardiac regeneration in a heart failure model. OE CMs present an epithelial-mesenchymal transition (EMT)-like regenerative response manifested by cytoskeletal remodelling, junction dissolution, migration and extracellular matrix turnover. We identified YAP as a critical mediator of ERBB2 signalling. In OE CMs, YAP interacts with nuclear-envelope and cytoskeletal components, reflecting an altered mechanical state elicited by ERBB2. We identified two YAP-activating phosphorylations on S352 and S274 in OE CMs, which peak during metaphase, that are ERK dependent and Hippo independent. Viral overexpression of YAP phospho-mutants dampened the proliferative competence of OE CMs. Together, we reveal a potent ERBB2-mediated YAP mechanotransduction signalling, involving EMT-like characteristics, resulting in robust heart regeneration.
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20
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Exon 3 of the NUMB Gene Emerged in the Chordate Lineage Coopting the NUMB Protein to the Regulation of MDM2. G3-GENES GENOMES GENETICS 2019; 9:3359-3367. [PMID: 31451549 PMCID: PMC6778778 DOI: 10.1534/g3.119.400494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
MDM2 regulates a variety of cellular processes through its dual protein:protein interaction and ubiquitin ligase activities. One major function of MDM2 is to bind and ubiquitinate P53, thereby regulating its proteasomal degradation. This function is in turn controlled by the cell fate determinant NUMB, which binds to and inhibits MDM2 via a short stretch of 11 amino acids, contained in its phosphotyrosine-binding (PTB) domain, encoded by exon 3 of the NUMB gene. The NUMB-MDM2-P53 circuitry is relevant to the specification of the stem cell fate and its subversion has been shown to be causal in breast cancer leading to the emergence of cancer stem cells. While extensive work on the evolutionary aspects of the MDM2/P53 circuitry has provided hints as to how these two proteins have evolved together to maintain conserved and linked functions, little is known about the evolution of the NUMB gene and, in particular, how it developed the ability to regulate MDM2 function. Here, we show that NUMB is a metazoan gene, which acquired exon 3 in the common ancestor of the Chordate lineage, first being present in the Cephalochordate and Tunicate subphyla, but absent in invertebrates. We provide experimental evidence showing that since its emergence, exon 3 conferred to the PTB domain of NUMB the ability to bind and to regulate MDM2 functions.
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21
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De Keulenaer GW, Feyen E, Dugaucquier L, Shakeri H, Shchendrygina A, Belenkov YN, Brink M, Vermeulen Z, Segers VFM. Mechanisms of the Multitasking Endothelial Protein NRG-1 as a Compensatory Factor During Chronic Heart Failure. Circ Heart Fail 2019; 12:e006288. [DOI: 10.1161/circheartfailure.119.006288] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Heart failure is a complex syndrome whose phenotypic presentation and disease progression depends on a complex network of adaptive and maladaptive responses. One of these responses is the endothelial release of NRG (neuregulin)-1—a paracrine growth factor activating ErbB2 (erythroblastic leukemia viral oncogene homolog B2), ErbB3, and ErbB4 receptor tyrosine kinases on various targets cells. NRG-1 features a multitasking profile tuning regenerative, inflammatory, fibrotic, and metabolic processes. Here, we review the activities of NRG-1 on different cell types and organs and their implication for heart failure progression and its comorbidities. Although, in general, effects of NRG-1 in heart failure are compensatory and beneficial, translation into therapies remains unaccomplished both because of the complexity of the underlying pathways and because of the challenges in the development of therapeutics (proteins, peptides, small molecules, and RNA-based therapies) for tyrosine kinase receptors. Here, we give an overview of the complexity to be faced and how it may be tackled.
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Affiliation(s)
- Gilles W. De Keulenaer
- Laboratory of Physiopharmacology, University of Antwerp, Belgium (G.W.D.K., E.F., L.D., H.S., Z.V., V.F.M.S.)
- Department of Cardiology, ZNA Hospital, Antwerp, Belgium (G.W.D.K.)
| | - Eline Feyen
- Laboratory of Physiopharmacology, University of Antwerp, Belgium (G.W.D.K., E.F., L.D., H.S., Z.V., V.F.M.S.)
| | - Lindsey Dugaucquier
- Laboratory of Physiopharmacology, University of Antwerp, Belgium (G.W.D.K., E.F., L.D., H.S., Z.V., V.F.M.S.)
| | - Hadis Shakeri
- Laboratory of Physiopharmacology, University of Antwerp, Belgium (G.W.D.K., E.F., L.D., H.S., Z.V., V.F.M.S.)
| | - Anastasia Shchendrygina
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russian Federation (A.S., Y.N.B.)
| | - Yury N. Belenkov
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russian Federation (A.S., Y.N.B.)
| | - Marijke Brink
- Department of Biomedicine, University Hospital Basel, University of Basel, Switzerland (M.B.)
| | - Zarha Vermeulen
- Laboratory of Physiopharmacology, University of Antwerp, Belgium (G.W.D.K., E.F., L.D., H.S., Z.V., V.F.M.S.)
| | - Vincent F. M. Segers
- Laboratory of Physiopharmacology, University of Antwerp, Belgium (G.W.D.K., E.F., L.D., H.S., Z.V., V.F.M.S.)
- Department of Cardiology, University Hospital Antwerp, Edegem, Belgium (V.F.M.S.)
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22
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Cardiomyocyte orientation modulated by the Numb family proteins-N-cadherin axis is essential for ventricular wall morphogenesis. Proc Natl Acad Sci U S A 2019; 116:15560-15569. [PMID: 31300538 PMCID: PMC6681736 DOI: 10.1073/pnas.1904684116] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The roles of cellular orientation during trabecular and ventricular wall morphogenesis are unknown, and so are the underlying mechanisms that regulate cellular orientation. Myocardial-specific Numb and Numblike double-knockout (MDKO) hearts display a variety of defects, including in cellular orientation, patterns of mitotic spindle orientation, trabeculation, and ventricular compaction. Furthermore, Numb- and Numblike-null cardiomyocytes exhibit cellular behaviors distinct from those of control cells during trabecular morphogenesis based on single-cell lineage tracing. We investigated how Numb regulates cellular orientation and behaviors and determined that N-cadherin levels and membrane localization are reduced in MDKO hearts. To determine how Numb regulates N-cadherin membrane localization, we generated an mCherry:Numb knockin line and found that Numb localized to diverse endocytic organelles but mainly to the recycling endosome. Consistent with this localization, cardiomyocytes in MDKO did not display defects in N-cadherin internalization but rather in postendocytic recycling to the plasma membrane. Furthermore, N-cadherin overexpression via a mosaic model partially rescued the defects in cellular orientation and trabeculation of MDKO hearts. Our study unravels a phenomenon that cardiomyocytes display spatiotemporal cellular orientation during ventricular wall morphogenesis, and its disruption leads to abnormal trabecular and ventricular wall morphogenesis. Furthermore, we established a mechanism by which Numb modulates cellular orientation and consequently trabecular and ventricular wall morphogenesis by regulating N-cadherin recycling to the plasma membrane.
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23
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Fang X, Bogomolovas J, Zhou PS, Mu Y, Ma X, Chen Z, Zhang L, Zhu M, Veevers J, Ouyang K, Chen J. P209L mutation in Bag3 does not cause cardiomyopathy in mice. Am J Physiol Heart Circ Physiol 2018; 316:H392-H399. [PMID: 30499714 DOI: 10.1152/ajpheart.00714.2018] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Bcl-2-associated athanogene 3 (BAG3) is a cochaperone protein and a central player of the cellular protein quality control system. BAG3 is prominently expressed in the heart and plays an essential role in cardiac protein homeostasis by interacting with chaperone heat shock proteins (HSPs) in large, functionally distinct multichaperone complexes. The BAG3 mutation of proline 209 to leucine (P209L), which resides in a critical region that mediates the direct interaction between BAG3 and small HSPs (sHSPs), is associated with cardiomyopathy in humans. However, the mechanism by which the BAG3 P209L missense mutation leads to cardiomyopathy remains unknown. To determine the molecular basis underlying the cardiomyopathy caused by the BAG3 P209L mutation, we generated a knockin (KI) mouse model in which the endogenous Bag3 gene was replaced with mutant Bag3 containing the P215L mutation, which is equivalent to the human P209L mutation. We performed physiological, histological, and biochemical analyses of Bag3 P209L KI mice to determine the functional, morphological, and molecular consequences of the P209L mutation. We found that Bag3 P209L KI mice exhibited normal cardiac function and morphology up to 16 mo of age. Western blot analysis further revealed that levels of sHSPs, stress-inducible HSPs, ubiquitinated proteins, and autophagy were unaffected in P209L mutant mouse hearts. In conclusion, the P209L mutation in Bag3 does not cause cardiomyopathy in mice up to 16 mo of age under baseline conditions. NEW & NOTEWORTHY Bcl-2-associated athanogene 3 (BAG3) P209L mutation is associated with human cardiomyopathy. A recent study reported that transgenic mice overexpressing human BAG3 P209L in cardiomyocytes have cardiac dysfunction. In contrast, our P209L mice that express mutant BAG3 at the same level as that of wild-type mice displayed no overt phenotype. Our results suggest that human cardiomyopathy may result from species-specific requirements for the conserved motif that is disrupted by P209L mutation or from genetic background-dependent effects.
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Affiliation(s)
- Xi Fang
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Julius Bogomolovas
- Department of Medicine, University of California-San Diego , La Jolla, California.,Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University , Mannheim , Germany
| | - Paul Shichao Zhou
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Yongxin Mu
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Xiaolong Ma
- Department of Medicine, University of California-San Diego , La Jolla, California.,Department of Cardiothoracic Surgery, The Second Xiangya Hospital, Central South University , Changsha, Hunan , China
| | - Zee Chen
- Department of Medicine, University of California-San Diego , La Jolla, California.,Drug Discovery Center, Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen , China
| | - Lunfeng Zhang
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Mason Zhu
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Jennifer Veevers
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Kunfu Ouyang
- Drug Discovery Center, Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen , China
| | - Ju Chen
- Department of Medicine, University of California-San Diego , La Jolla, California
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24
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Gulaia V, Kumeiko V, Shved N, Cicinskas E, Rybtsov S, Ruzov A, Kagansky A. Molecular Mechanisms Governing the Stem Cell's Fate in Brain Cancer: Factors of Stemness and Quiescence. Front Cell Neurosci 2018; 12:388. [PMID: 30510501 PMCID: PMC6252330 DOI: 10.3389/fncel.2018.00388] [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] [Received: 07/18/2018] [Accepted: 10/09/2018] [Indexed: 12/25/2022] Open
Abstract
Cellular quiescence is a reversible, non-cycling state controlled by epigenetic, transcriptional and niche-associated molecular factors. Quiescence is a condition where molecular signaling pathways maintain the poised cell-cycle state whilst enabling rapid cell cycle re-entry. To achieve therapeutic breakthroughs in oncology it is crucial to decipher these molecular mechanisms employed by the cancerous milieu to control, maintain and gear stem cells towards re-activation. Cancer stem-like cells (CSCs) have been extensively studied in most malignancies, including glioma. Here, the aberrant niche activities skew the quiescence/activation equilibrium, leading to rapid tumor relapse after surgery and/or chemotherapy. Unraveling quiescence mechanisms promises to afford prevention of (often multiple) relapses, a key problem in current glioma treatment. This review article covers the current knowledge regarding normal and aberrant cellular quiescence control whilst also exploring how different molecular mechanisms and properties of the neighboring cells can influence the molecular processes behind glioma stem cell quiescence.
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Affiliation(s)
- Valeriia Gulaia
- Centre for Genomic and Regenerative Medicine, School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Vadim Kumeiko
- Centre for Genomic and Regenerative Medicine, School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- National Scientific Center of Marine Biology, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
| | - Nikita Shved
- Centre for Genomic and Regenerative Medicine, School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- National Scientific Center of Marine Biology, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
| | - Eduardas Cicinskas
- Department of Cellular Biology and Genetics, School of Natural Sciences, Far Eastern Federal University, Vladivostok, Russia
- Laboratory of Pharmacology and Bioassays, School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Stanislav Rybtsov
- Institute for Stem Cell Research, Medical Research Council Centre for Regenerative Medicine, University of Edinburgh, SCRM Bioquarter, Scotland, United Kingdom
| | - Alexey Ruzov
- Wolfson Centre for Stem Cells, Tissue Engineering and Modelling (STEM), Division of Cancer and Stem Cells, School of Medicine, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham, United Kingdom
| | - Alexander Kagansky
- Centre for Genomic and Regenerative Medicine, School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
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25
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NUMB maintains bone mass by promoting degradation of PTEN and GLI1 via ubiquitination in osteoblasts. Bone Res 2018; 6:32. [PMID: 30455992 PMCID: PMC6226489 DOI: 10.1038/s41413-018-0030-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/22/2018] [Accepted: 03/13/2018] [Indexed: 02/05/2023] Open
Abstract
The adaptor protein NUMB is involved in asymmetric division and cell fate determination and recognized as an antagonist of Notch. Previous studies have proved that Notch activation in osteoblasts contributes to a high bone mass. In this study, however, an osteopenic phenotype was found in 9-week-old mice using osteoblastic specific Col1a1–2.3-Cre to ablate both Numb and its homologue Numbl . The trabecular bone mass decreased dramatically while the cortical bone mass was unaffected. Here, the Notch signal was not activated, while the tensin homologue deleted on human chromosome 10 (PTEN), which dephosphorylates phosphatidylinositide 3-kinases, was elevated, attenuating protein kinase B (Akt). The ubiquitination assay revealed that NUMB may physiologically promote PTEN ubiquitination in the presence of neural precursor cell-expressed developmentally downregulated protein 4–1. In addition, the deficiency of Numb/Numbl also activated the Hedgehog pathway through GLI1. This process was found to improve the ratio of the receptor activator of nuclear factor-kB ligand to osteoprotegerin, which enhanced the differentiation of osteoclasts and bone resorption . In conclusion, this study provides an insight into new functons of NUMB and NUMBL on bone homeostasis. The related proteins NUMB and NUMBL maintain the survival of bone-generating osteoblast cells. NUMB was previously recognized to antagonize Notch signaling pathway ; In this study, it observes that genetically altered mice, unable to express the two proteins, suffered from degraded bone quality. This suggests that the two proteins play a more complex, nuanced role in the process of bone mass maintenance. The team’s studies showed that NUMB and NUMBL suppression inhibits a signaling pathway important to skeletal development and protein synthesis in osteoblasts, though raise that further investigations are essential to elucidate the exact mechanistic action of these proteins. The authors of this study suggest that NUMB constitutes a potential target for therapies targeting bone loss and reduced bone strength in patients with osteoporosis.
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26
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Zobel M, Disanza A, Senic-Matuglia F, Franco M, Colaluca IN, Confalonieri S, Bisi S, Barbieri E, Caldieri G, Sigismund S, Pece S, Chavrier P, Di Fiore PP, Scita G. A NUMB-EFA6B-ARF6 recycling route controls apically restricted cell protrusions and mesenchymal motility. J Cell Biol 2018; 217:3161-3182. [PMID: 30061108 PMCID: PMC6123001 DOI: 10.1083/jcb.201802023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 05/17/2018] [Accepted: 06/05/2018] [Indexed: 12/13/2022] Open
Abstract
The endocytic protein NUMB has been implicated in the control of various polarized cellular processes, including the acquisition of mesenchymal migratory traits through molecular mechanisms that have only been partially defined. Here, we report that NUMB is a negative regulator of a specialized set of understudied, apically restricted, actin-based protrusions, the circular dorsal ruffles (CDRs), induced by either PDGF or HGF stimulation. Through its PTB domain, NUMB binds directly to an N-terminal NPLF motif of the ARF6 guanine nucleotide exchange factor, EFA6B, and promotes its exchange activity in vitro. In cells, a NUMB-EFA6B-ARF6 axis regulates the recycling of the actin regulatory cargo RAC1 and is critical for the formation of CDRs that mark the acquisition of a mesenchymal mode of motility. Consistently, loss of NUMB promotes HGF-induced cell migration and invasion. Thus, NUMB negatively controls membrane protrusions and the acquisition of mesenchymal migratory traits by modulating EFA6B-ARF6 activity.
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Affiliation(s)
- Martina Zobel
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy
| | - Andrea Disanza
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy
| | | | - Michel Franco
- Université Côte d'Azur, Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | | | | | - Sara Bisi
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy
| | - Elisa Barbieri
- Department of Experimental Oncology, European Institute of Oncology, Milan, Italy
| | - Giusi Caldieri
- Department of Experimental Oncology, European Institute of Oncology, Milan, Italy
- Department of Oncology and Hemato-Oncology, University of Milan, Milan, Italy
| | - Sara Sigismund
- Department of Experimental Oncology, European Institute of Oncology, Milan, Italy
- Department of Oncology and Hemato-Oncology, University of Milan, Milan, Italy
| | - Salvatore Pece
- Department of Experimental Oncology, European Institute of Oncology, Milan, Italy
- Department of Oncology and Hemato-Oncology, University of Milan, Milan, Italy
| | - Philippe Chavrier
- Institut Curie, PSL Research University, Paris, France
- Centre National de la Recherche Scientifique UMR 144, Membrane and Cytoskeleton Dynamics Team, Paris, France
| | - Pier Paolo Di Fiore
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy
- Department of Experimental Oncology, European Institute of Oncology, Milan, Italy
- Department of Oncology and Hemato-Oncology, University of Milan, Milan, Italy
| | - Giorgio Scita
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy
- Department of Oncology and Hemato-Oncology, University of Milan, Milan, Italy
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Liu Y, Chen H, Shou W. Potential Common Pathogenic Pathways for the Left Ventricular Noncompaction Cardiomyopathy (LVNC). Pediatr Cardiol 2018; 39:1099-1106. [PMID: 29766225 PMCID: PMC6093786 DOI: 10.1007/s00246-018-1882-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 04/24/2018] [Indexed: 01/01/2023]
Abstract
Ventricular trabeculation and compaction are two essential morphogenetic events for generating a functionally competent ventricular wall. A significant reduction in trabeculation is usually associated with hypoplastic wall and ventricular compact zone deficiencies, which commonly leads to embryonic heart failure and early embryonic lethality. In contrast, the arrest of ventricular wall compaction (noncompaction) is believed to be causative to the left ventricular noncompaction (LVNC), a genetically heterogeneous disorder and the third most common cardiomyopathy among pediatric patients. After critically reviewing recent findings from genetically engineered mouse models, we suggest a model which proposes that defects in myofibrillogenesis and polarization in trabecular cardiomyocytes underly the common pathogenic mechanism for ventricular noncompaction.
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Affiliation(s)
- Ying Liu
- Riley Heart Research Center, Herman B. Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Hanying Chen
- Riley Heart Research Center, Herman B. Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Weinian Shou
- Riley Heart Research Center, Herman B. Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
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28
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Artap S, Manderfield LJ, Smith CL, Poleshko A, Aghajanian H, See K, Li L, Jain R, Epstein JA. Endocardial Hippo signaling regulates myocardial growth and cardiogenesis. Dev Biol 2018; 440:22-30. [PMID: 29727635 DOI: 10.1016/j.ydbio.2018.04.026] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 04/19/2018] [Accepted: 04/19/2018] [Indexed: 01/17/2023]
Abstract
The Hippo signaling pathway has been implicated in control of cell and organ size, proliferation, and endothelial-mesenchymal transformation. This pathway impacts upon two partially redundant transcription cofactors, Yap and Taz, that interact with other factors, including members of the Tead family, to affect expression of downstream genes. Yap and Taz have been shown to regulate, in a cell-autonomous manner, myocardial proliferation, myocardial hypertrophy, regenerative potential, and overall size of the heart. Here, we show that Yap and Taz also play an instructive, non-cell-autonomous role in the endocardium of the developing heart to regulate myocardial growth through release of the paracrine factor, neuregulin. Without endocardial Yap and Taz, myocardial growth is impaired causing early post-natal lethality. Thus, the Hippo signaling pathway regulates cell size via both cell-autonomous and non-cell-autonomous mechanisms. Furthermore, these data suggest that Hippo may regulate organ size via a sensing and paracrine function in endothelial cells.
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Affiliation(s)
- Stanley Artap
- Department of Cell and Developmental Biology, The Cardiovascular Institute and the Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Lauren J Manderfield
- Department of Cell and Developmental Biology, The Cardiovascular Institute and the Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Cheryl L Smith
- Department of Cell and Developmental Biology, The Cardiovascular Institute and the Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Andrey Poleshko
- Department of Cell and Developmental Biology, The Cardiovascular Institute and the Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Haig Aghajanian
- Department of Cell and Developmental Biology, The Cardiovascular Institute and the Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kelvin See
- Department of Cell and Developmental Biology, The Cardiovascular Institute and the Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Li Li
- Department of Cell and Developmental Biology, The Cardiovascular Institute and the Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Rajan Jain
- Department of Cell and Developmental Biology, The Cardiovascular Institute and the Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jonathan A Epstein
- Department of Cell and Developmental Biology, The Cardiovascular Institute and the Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.
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29
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30
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Stroud MJ, Fang X, Zhang J, Guimarães-Camboa N, Veevers J, Dalton ND, Gu Y, Bradford WH, Peterson KL, Evans SM, Gerace L, Chen J. Luma is not essential for murine cardiac development and function. Cardiovasc Res 2018; 114:378-388. [PMID: 29040414 PMCID: PMC6019056 DOI: 10.1093/cvr/cvx205] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 10/11/2017] [Indexed: 12/13/2022] Open
Abstract
AIMS Luma is a recently discovered, evolutionarily conserved protein expressed in mammalian heart, which is associated with the LInker of Nucleoskeleton and Cytoskeleton (LINC) complex. The LINC complex structurally integrates the nucleus and the cytoplasm and plays a critical role in mechanotransduction across the nuclear envelope. Mutations in several LINC components in both humans and mice result in various cardiomyopathies, implying they play essential, non-redundant roles. A single amino acid substitution of serine 358 to leucine (S358L) in Luma is the unequivocal cause of a distinct form of arrhythmogenic cardiomyopathy. However, the role of Luma in heart has remained obscure. In addition, it also remains to be determined how the S358L mutation in Luma leads to cardiomyopathy. METHODS AND RESULTS To determine the role of Luma in the heart, we first determined the expression pattern of Luma in mouse heart. Luma was sporadically expressed in cardiomyocytes throughout the heart, but was highly and uniformly expressed in cardiac fibroblasts and vascular smooth muscle cells. We also generated germline null Luma mice and discovered that germline null mutants were viable and exhibited normal cardiac function. Luma null mice also responded normally to pressure overload induced by transverse aortic constriction. In addition, localization and expression of other LINC complex components in both cardiac myocytes and fibroblasts was unaffected by global loss of Luma. Furthermore, we also generated and characterized Luma S358L knock-in mice, which displayed normal cardiac function and morphology. CONCLUSION Our data suggest that Luma is dispensable for murine cardiac development and function and that the Luma S358L mutation alone may not cause cardiomyopathy in mice.
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MESH Headings
- Animals
- Arrhythmogenic Right Ventricular Dysplasia/genetics
- Arrhythmogenic Right Ventricular Dysplasia/metabolism
- Cells, Cultured
- Cytoskeleton/metabolism
- Female
- Fibroblasts/metabolism
- Gene Expression Regulation, Developmental
- Genetic Predisposition to Disease
- Heart/embryology
- Heart/physiopathology
- Humans
- Hypertrophy, Left Ventricular/genetics
- Hypertrophy, Left Ventricular/metabolism
- Hypertrophy, Left Ventricular/physiopathology
- Male
- Mechanotransduction, Cellular
- Membrane Proteins/genetics
- Membrane Proteins/metabolism
- Mice, Inbred C57BL
- Mice, Knockout
- Morphogenesis
- Myocardium/metabolism
- Myocardium/pathology
- Myocytes, Cardiac/metabolism
- Myocytes, Smooth Muscle/metabolism
- Nuclear Matrix/metabolism
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Affiliation(s)
- Matthew J Stroud
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Xi Fang
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Jianlin Zhang
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Nuno Guimarães-Camboa
- Department of Pharmacology, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA 92093, USA
| | - Jennifer Veevers
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Nancy D Dalton
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Yusu Gu
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - William H Bradford
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Kirk L Peterson
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Sylvia M Evans
- Department of Pharmacology, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA 92093, USA
| | - Larry Gerace
- Department of Cell and Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Ju Chen
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
- Corresponding author. Tel: 858 822 4276; fax: 858 822 3027, E-mail:
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31
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Chen X, Liu Z, Shan Z, Yao W, Gu A, Wen W. Structural determinants controlling 14-3-3 recruitment to the endocytic adaptor Numb and dissociation of the Numb·α-adaptin complex. J Biol Chem 2018; 293:4149-4158. [PMID: 29382713 DOI: 10.1074/jbc.ra117.000897] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 01/24/2018] [Indexed: 12/15/2022] Open
Abstract
Traffic of cargo across membranes helps establish, maintain, and reorganize distinct cellular compartments and is fundamental to many metabolic processes. The cargo-selective endocytic adaptor Numb participates in clathrin-dependent endocytosis by attaching cargoes to the clathrin adaptor α-adaptin. The phosphorylation of Numb at Ser265 and Ser284 recruits the regulatory protein 14-3-3, accompanied by the dissociation of Numb from α-adaptin and Numb's translocation from the cortical membrane to the cytosol. However, the molecular mechanisms underlying the Numb-α-adaptin interaction and its regulation by Numb phosphorylation and 14-3-3 recruitment remain poorly understood. Here, biochemical and structural analyses of the Numb·14-3-3 complex revealed that Numb phosphorylation at both Ser265 and Ser284 is required for Numb's efficient interaction with 14-3-3. We also discovered that an RQFRF motif surrounding Ser265 in Numb functions together with the canonical C-terminal DPF motif, required for Numb's interaction with α-adaptin, to form a stable complex with α-adaptin. Of note, we provide evidence that the phosphorylation-induced binding of 14-3-3 to Numb directly competes with the binding of α-adaptin to Numb. Our findings suggest a potential mechanism governing the dynamic assembly of Numb with α-adaptin or 14-3-3. This dual-site recognition of Numb by α-adaptin may have implications for other α-adaptin targets. We propose that the newly identified α-adaptin-binding site surrounding Ser265 in Numb functions as a triggering mechanism for the dynamic dissociation of the Numb·α-adaptin complex.
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Affiliation(s)
- Xing Chen
- From the Department of Neurosurgery, Huashan Hospital, Institutes of Biomedical Sciences, State Key Laboratory of Medical Neurobiology and Department of Systems Biology for Medicine, School of Basic Medical Sciences, Shanghai Medical College of Fudan University, Shanghai 200032, China
| | - Ziheng Liu
- From the Department of Neurosurgery, Huashan Hospital, Institutes of Biomedical Sciences, State Key Laboratory of Medical Neurobiology and Department of Systems Biology for Medicine, School of Basic Medical Sciences, Shanghai Medical College of Fudan University, Shanghai 200032, China
| | - Zelin Shan
- From the Department of Neurosurgery, Huashan Hospital, Institutes of Biomedical Sciences, State Key Laboratory of Medical Neurobiology and Department of Systems Biology for Medicine, School of Basic Medical Sciences, Shanghai Medical College of Fudan University, Shanghai 200032, China
| | - Weiyi Yao
- From the Department of Neurosurgery, Huashan Hospital, Institutes of Biomedical Sciences, State Key Laboratory of Medical Neurobiology and Department of Systems Biology for Medicine, School of Basic Medical Sciences, Shanghai Medical College of Fudan University, Shanghai 200032, China
| | - Aihong Gu
- From the Department of Neurosurgery, Huashan Hospital, Institutes of Biomedical Sciences, State Key Laboratory of Medical Neurobiology and Department of Systems Biology for Medicine, School of Basic Medical Sciences, Shanghai Medical College of Fudan University, Shanghai 200032, China
| | - Wenyu Wen
- From the Department of Neurosurgery, Huashan Hospital, Institutes of Biomedical Sciences, State Key Laboratory of Medical Neurobiology and Department of Systems Biology for Medicine, School of Basic Medical Sciences, Shanghai Medical College of Fudan University, Shanghai 200032, China
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32
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Abstract
NUMB, and its close homologue NUMBL, behave as tumor suppressor genes by regulating the Notch pathway. The downregulation of these genes in tumors is common, allowing aberrant Notch pathway activation and tumor progression. However, some known differences between NUMB and NUMBL have raised unanswered questions regarding the redundancy and/or combined regulation of the Notch pathway by these genes during the tumorigenic process. We have found that NUMB and NUMBL exhibit mutual exclusivity in human tumors, suggesting that the associated tumor suppressor role is regulated by only one of the two proteins in a specific cell, avoiding duplicate signaling and simplifying the regulatory network. We have also found differences in gene expression due to NUMB or NUMBL downregulation. These differences in gene regulation extend to pathways, such as WNT or Hedgehog. In addition to these differences, the downregulation of either gene triggers a cancer stem cell-like related phenotype. These results show the importance of both genes as an intersection with different effects over cancer stem cell signaling pathways.
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33
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Stroud MJ, Fang X, Veevers J, Chen J. Generation and Analysis of Striated Muscle Selective LINC Complex Protein Mutant Mice. Methods Mol Biol 2018; 1840:251-281. [PMID: 30141050 PMCID: PMC6887482 DOI: 10.1007/978-1-4939-8691-0_18] [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] [Indexed: 03/23/2023]
Abstract
The linker of nucleoskeleton and cytoskeleton (LINC) complex mediates intracellular cross talk between the nucleus and the cytoplasm. In striated muscle, the LINC complex provides structural support to the myocyte nucleus and plays an essential role in regulating gene expression and mechanotransduction. A wide range of cardiac and skeletal myopathies have been linked to mutations in LINC complex proteins. Studies utilizing tissue-specific knockout and mutant mouse models have revealed important insights into the roles of the LINC complex in striated muscle. In this chapter, we describe several feasible approaches for generating striated muscle-specific gene knockout and mutant mouse models to study LINC complex protein function in cardiac and skeletal muscle. The experimental procedures used for phenotyping and analysis of LINC complex knockout mice are also described.
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Affiliation(s)
- Matthew J Stroud
- Department of Medicine, University of California, San Diego, La Jolla, CA, USA
- Cardiovascular Division, King's College London, British Heart Foundation Centre of Excellence, London, UK
| | - Xi Fang
- Department of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Jennifer Veevers
- Department of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Ju Chen
- Department of Medicine, University of California, San Diego, La Jolla, CA, USA.
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34
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Sun H, Liu Y, Zhang L, Shao X, Liu K, Ding Z, Liu X, Jiang C, Li H, Li H. Numb positively regulates autophagic flux via regulating lysosomal function. Biochem Biophys Res Commun 2017; 491:780-786. [PMID: 28720501 DOI: 10.1016/j.bbrc.2017.07.084] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 07/14/2017] [Indexed: 11/15/2022]
Abstract
Autophagy is a lysosome-dependent catabolic process involving in the degradation and recycling of unnecessary or damaged proteins and organelles. Emerging evidence indicates that autophagy dysfunction is closely related to various human diseases including cancer, aging, myopathies and neurodegenerative disorders. Here, using genetic knockdown, we uncover the role of Numb, an endocytic adaptor protein, in regulating the late steps of autophagy. We found that Numb depletion led to the accumulation of autophagic vacuole, as verified by RFP-LC3 staining combined with transmission electron microscopy. Further investigation indicated that Numb depletion impaired autophagic degradation through inhibiting the activities of lysosomal enzymes (Cathepsin D, β-glucuronidase and β-glucosidase). Moreover, Numb depletion induced elevation of lysosomal pH values and decrease of glycosylated lysosome-associated membrane proteins. We further observed that Rab7 activity was inhibited in Numb-depleted cells. Together, our findings revealed a novel function of Numb and its likely mechanism in regulation of autophagy events.
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Affiliation(s)
- Haiyan Sun
- Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yi Liu
- Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Lei Zhang
- Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Ximing Shao
- Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Ke Liu
- Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Zhihao Ding
- Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Xianming Liu
- Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China; College of Life Science and Technology, Jinan University, 601 West Huangpu Blvd., Guangzhou 510632, China
| | - Changan Jiang
- Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Huashun Li
- SARITEX Center for Stem Cell Engineering Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Advanced Institute of Translational Medicine, Shanghai 200123, China; ATCG Corporation, BioBay, Suzhou Industrial Park, Suzhou, Jiangsu 215123, China
| | - Hongchang Li
- Shenzhen Key Laboratory for Molecular Biology of Neural Development, Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China.
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35
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Abstract
Efficient cardiac regeneration is closely associated with the ability of cardiac myocytes to proliferate. Fetal or neonatal mouse hearts containing proliferating cardiac myocytes regenerate even extensive injuries, whereas adult hearts containing mostly post-mitotic cardiac myocytes have lost this ability. The same correlation is seen in some homoiotherm species such as teleost fish and urodelian amphibians leading to the hypothesis that cardiac myocyte proliferation is a major driver of heart regeneration. Although cardiomyocyte proliferation might not be the only prerequisite to restore full organ function after cardiac damage, induction of cardiac myocyte proliferation is an attractive therapeutic option to cure the injured heart and prevent heart failure. To (re)initiate cardiac myocyte proliferation in adult mammalian hearts, a thorough understanding of the molecular circuitry governing cardiac myocyte cell cycle regulation is required. Here, we review the current knowledge in the field focusing on the withdrawal of cardiac myocytes from the cell cycle during the transition from neonatal to adult stages.
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Affiliation(s)
- Xuejun Yuan
- From the Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany (X.Y., T.B.); and Department of Internal Medicine II, Justus Liebig University Giessen, Member of the German Center for Cardiovascular Research (DZHK), Member of the German Center for Lung Research (DZL), Giessen, Germany (T.B.)
| | - Thomas Braun
- From the Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany (X.Y., T.B.); and Department of Internal Medicine II, Justus Liebig University Giessen, Member of the German Center for Cardiovascular Research (DZHK), Member of the German Center for Lung Research (DZL), Giessen, Germany (T.B.).
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36
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Fang X, Bogomolovas J, Wu T, Zhang W, Liu C, Veevers J, Stroud MJ, Zhang Z, Ma X, Mu Y, Lao DH, Dalton ND, Gu Y, Wang C, Wang M, Liang Y, Lange S, Ouyang K, Peterson KL, Evans SM, Chen J. Loss-of-function mutations in co-chaperone BAG3 destabilize small HSPs and cause cardiomyopathy. J Clin Invest 2017; 127:3189-3200. [PMID: 28737513 DOI: 10.1172/jci94310] [Citation(s) in RCA: 92] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 05/19/2017] [Indexed: 12/11/2022] Open
Abstract
Defective protein quality control (PQC) systems are implicated in multiple diseases. Molecular chaperones and co-chaperones play a central role in functioning PQC. Constant mechanical and metabolic stress in cardiomyocytes places great demand on the PQC system. Mutation and downregulation of the co-chaperone protein BCL-2-associated athanogene 3 (BAG3) are associated with cardiac myopathy and heart failure, and a BAG3 E455K mutation leads to dilated cardiomyopathy (DCM). However, the role of BAG3 in the heart and the mechanisms by which the E455K mutation leads to DCM remain obscure. Here, we found that cardiac-specific Bag3-KO and E455K-knockin mice developed DCM. Comparable phenotypes in the 2 mutants demonstrated that the E455K mutation resulted in loss of function. Further experiments revealed that the E455K mutation disrupted the interaction between BAG3 and HSP70. In both mutants, decreased levels of small heat shock proteins (sHSPs) were observed, and a subset of proteins required for cardiomyocyte function was enriched in the insoluble fraction. Together, these observations suggest that interaction between BAG3 and HSP70 is essential for BAG3 to stabilize sHSPs and maintain cardiomyocyte protein homeostasis. Our results provide insight into heart failure caused by defects in BAG3 pathways and suggest that increasing BAG3 protein levels may be of therapeutic benefit in heart failure.
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Affiliation(s)
- Xi Fang
- Department of Medicine, UCSD, La Jolla, California, USA
| | - Julius Bogomolovas
- Department of Medicine, UCSD, La Jolla, California, USA.,Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Tongbin Wu
- Department of Medicine, UCSD, La Jolla, California, USA
| | - Wei Zhang
- Department of Medicine, UCSD, La Jolla, California, USA
| | - Canzhao Liu
- Department of Medicine, UCSD, La Jolla, California, USA
| | | | | | - Zhiyuan Zhang
- Department of Medicine, UCSD, La Jolla, California, USA.,Department of Cardiothoracic Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Xiaolong Ma
- Department of Medicine, UCSD, La Jolla, California, USA.,Department of Cardiothoracic Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Yongxin Mu
- Department of Medicine, UCSD, La Jolla, California, USA
| | - Dieu-Hung Lao
- Department of Medicine, UCSD, La Jolla, California, USA
| | | | - Yusu Gu
- Department of Medicine, UCSD, La Jolla, California, USA
| | - Celine Wang
- Department of Medicine, UCSD, La Jolla, California, USA
| | - Michael Wang
- Department of Medicine, UCSD, La Jolla, California, USA
| | - Yan Liang
- Department of Medicine, UCSD, La Jolla, California, USA
| | - Stephan Lange
- Department of Medicine, UCSD, La Jolla, California, USA
| | - Kunfu Ouyang
- Drug Discovery Center, Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen, China
| | | | - Sylvia M Evans
- Department of Medicine, UCSD, La Jolla, California, USA.,Department of Pharmacology and.,Skaggs School of Pharmacy and Pharmaceutical Sciences, UCSD, La Jolla, California, USA
| | - Ju Chen
- Department of Medicine, UCSD, La Jolla, California, USA
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