1
|
Stirmlinger N, Delling JP, Pfänder S, Boeckers TM. Elevation of SHANK3 Levels by Antisense Oligonucleotides Directed Against the 3'-UTR of the Human SHANK3 mRNA. Nucleic Acid Ther 2023; 33:58-71. [PMID: 36355061 PMCID: PMC9940809 DOI: 10.1089/nat.2022.0048] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
SHANK3 is a member of the SHANK family of scaffolding proteins that localize to the postsynaptic density of excitatory synapses. Mutations within the SHANK3 gene or SHANK3 haploinsufficiency is thought to be one of the major causes for Phelan-McDermid Syndrome (PMDS) that is characterized by a broad spectrum of autism-related behavioral alterations. Several approaches have already been proposed to elevate SHANK3 protein levels in PMDS patients like transcriptional activation or inhibition of SHANK3 degradation. We undertook a systematic screening approach and tested whether defined antisense oligonucleotides (ASOs) directed against the 3' untranslated region (3'-UTR) of the human SHANK3 mRNA are suitable to elevate SHANK3 protein levels. Using human induced pluripotent stem cells (hiPSCs) and hiPSCs-derived motoneurons from controls and PMDS patients we eventually identified two 18 nucleotide ASOs (ASO 4-5.2-4 and 4-5.2-6) that were able to increase SHANK3 protein levels in vitro by about 1.3- to 1.6-fold. These findings were confirmed by co-transfection of the identified ASOs with a GFP-SHANK3-3'-UTR construct in HEK293T cells using GFP protein expression as read-out. Based on these results we propose a novel approach to elevate SHANK3 protein concentrations by 3'-UTR specific ASOs. Further research is needed to test the suitability of SHANK3-specific ASOs as pharmacological compounds also in vivo.
Collapse
Affiliation(s)
- Nadine Stirmlinger
- Institute of Anatomy and Cell Biology and Ulm University, Ulm, Germany.,International Graduate School for Molecular Medicine, Ulm University, Ulm, Germany
| | | | - Stefanie Pfänder
- Institute of Anatomy and Cell Biology and Ulm University, Ulm, Germany
| | - Tobias M. Boeckers
- Institute of Anatomy and Cell Biology and Ulm University, Ulm, Germany.,DZNE, Ulm Site, Ulm, Germany.,Address correspondence to: Tobias Boeckers, MD, Institute of Anatomy and Cell Biology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| |
Collapse
|
2
|
Ruffenach G, Medzikovic L, Aryan L, Li M, Eghbali M. HNRNPA2B1: RNA-Binding Protein That Orchestrates Smooth Muscle Cell Phenotype in Pulmonary Arterial Hypertension. Circulation 2022; 146:1243-1258. [PMID: 35993245 PMCID: PMC9588778 DOI: 10.1161/circulationaha.122.059591] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 07/20/2022] [Indexed: 01/24/2023]
Abstract
BACKGROUND RNA-binding proteins are master orchestrators of gene expression regulation. They regulate hundreds of transcripts at once by recognizing specific motifs. Thus, characterizing RNA-binding proteins targets is critical to harvest their full therapeutic potential. However, such investigation has often been restricted to a few RNA-binding protein targets, limiting our understanding of their function. In cancer, the RNA-binding protein HNRNPA2B1 (heterogeneous nuclear ribonucleoprotein A2B1; A2B1) promotes the pro-proliferative/anti-apoptotic phenotype. The same phenotype in pulmonary arterial smooth muscle cells (PASMCs) is responsible for the development of pulmonary arterial hypertension (PAH). However, A2B1 function has never been investigated in PAH. METHOD Through the integration of computational and experimental biology, the authors investigated the role of A2B1 in human PAH-PASMC. Bioinformatics and RNA sequencing allowed them to investigate the transcriptome-wide function of A2B1, and RNA immunoprecipitation and A2B1 silencing experiments allowed them to decipher the intricate molecular mechanism at play. In addition, they performed a preclinical trial in the monocrotaline-induced pulmonary hypertension rat model to investigate the relevance of A2B1 inhibition in mitigating pulmonary hypertension severity. RESULTS They found that A2B1 expression and its nuclear localization are increased in human PAH-PASMC. Using bioinformatics, they identified 3 known motifs of A2B1 and all mRNAs carrying them. In PAH-PASMC, they demonstrated the complementary nonredundant function of A2B1 motifs because all motifs are implicated in different aspects of the cell cycle. In addition, they showed that in PAH-PASMC, A2B1 promotes the expression of its targets. A2B1 silencing in PAH-PASMC led to a decrease of all tested mRNAs carrying an A2B1 motif and a concomitant decrease in proliferation and resistance to apoptosis. Last, in vivo A2B1 inhibition in the lungs rescued pulmonary hypertension in rats. CONCLUSIONS Through the integration of computational and experimental biology, the study revealed the role of A2B1 as a master orchestrator of the PAH-PASMC phenotype and its relevance as a therapeutic target in PAH.
Collapse
Affiliation(s)
- Grégoire Ruffenach
- Division of Molecular Medicine, Department of Anesthesiology and Perioperative Medicine,David Geffen School of Medicine, University of California, Los Angeles
| | - Lejla Medzikovic
- Division of Molecular Medicine, Department of Anesthesiology and Perioperative Medicine,David Geffen School of Medicine, University of California, Los Angeles
| | - Laila Aryan
- Division of Molecular Medicine, Department of Anesthesiology and Perioperative Medicine,David Geffen School of Medicine, University of California, Los Angeles
| | - Min Li
- Division of Molecular Medicine, Department of Anesthesiology and Perioperative Medicine,David Geffen School of Medicine, University of California, Los Angeles
| | - Mansoureh Eghbali
- Division of Molecular Medicine, Department of Anesthesiology and Perioperative Medicine,David Geffen School of Medicine, University of California, Los Angeles
| |
Collapse
|
3
|
Zhang P, Luo J, Wu T, Wang X, Yang F, Yu Y, Lu L, Yu H. MiR-32-5p/AIDA Mediates OxLDL-Induced Endothelial Injury and Inflammation. Int Heart J 2022; 63:928-938. [DOI: 10.1536/ihj.22-067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Ping Zhang
- Shenzhen Hospital, Southern Medical University
| | - Jianfang Luo
- Department of Cardiovascular, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Science
| | - Tianlong Wu
- Department of Cardiovascular, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Science
| | - Xuan Wang
- Department of Cardiovascular, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Science
| | - Fan Yang
- Department of Cardiovascular, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Science
| | - Yanhong Yu
- Key Laboratory of Regenerative Medicine of Ministry of Education, Department of Developmental and Regenerative Biology, College of Life Science and Technology, Jinan University
| | - Lihe Lu
- Department of Pathophysiolgy, Zhongshan School of Medicine, Sun Yat-Sen University
| | - Huimin Yu
- Department of Cardiovascular, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Science
| |
Collapse
|
4
|
Sikorski V, Vento A, Kankuri E. Emerging roles of the RNA modifications N6-methyladenosine and adenosine-to-inosine in cardiovascular diseases. MOLECULAR THERAPY - NUCLEIC ACIDS 2022; 29:426-461. [PMID: 35991314 PMCID: PMC9366019 DOI: 10.1016/j.omtn.2022.07.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Cardiovascular diseases lead the mortality and morbidity disease metrics worldwide. A multitude of chemical base modifications in ribonucleic acids (RNAs) have been linked with key events of cardiovascular diseases and metabolic disorders. Named either RNA epigenetics or epitranscriptomics, the post-transcriptional RNA modifications, their regulatory pathways, components, and downstream effects substantially contribute to the ways our genetic code is interpreted. Here we review the accumulated discoveries to date regarding the roles of the two most common epitranscriptomic modifications, N6-methyl-adenosine (m6A) and adenosine-to-inosine (A-to-I) editing, in cardiovascular disease.
Collapse
Affiliation(s)
- Vilbert Sikorski
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
| | - Antti Vento
- Heart and Lung Center, Helsinki University Hospital, 00029 Helsinki, Finland
| | - Esko Kankuri
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
- Corresponding author Esko Kankuri, M.D. Ph.D., Faculty of Medicine, Department of Pharmacology, PO Box 63 (Haartmaninkatu 8), FIN-00014 University of Helsinki, 00014 Helsinki, Finland.
| | | |
Collapse
|
5
|
Kim JH, Park HS, Lee JY, Ko EJ, Kim YR, Cho HY, Lee WS, Ahn EH, Kim NK. Association Study between Mucin 4 ( MUC4) Polymorphisms and Idiopathic Recurrent Pregnancy Loss in a Korean Population. Genes (Basel) 2022; 13:937. [PMID: 35741699 PMCID: PMC9222798 DOI: 10.3390/genes13060937] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/17/2022] [Accepted: 05/21/2022] [Indexed: 11/16/2022] Open
Abstract
Recurrent pregnancy loss (RPL) is the loss of two or more consecutive pregnancies before 20 weeks of gestational age. Our study investigated whether mucin 4 (MUC4) polymorphisms are associated with RPL. MUC polymorphisms (rs882605 C>A, rs1104760 A>G, rs2688513 A>G, rs2258447 C>T, and rs2291652 A>G) were genotyped in 374 women with RPL and 239 controls of Korean ethnicity using polymerase chain reaction-restriction fragment length polymorphism analysis and the TaqMan probe SNP genotyping assay. Differences in genotype frequencies between cases of RPL and the controls were compared. MUC4 rs882605 C>A and rs1104760 A>G polymorphisms were associated with increased incidence of RPL in three and four or more pregnancy loss patients. The haplotype analyses showed a tendency for the allelic effect including the association of MUC4 rs882605 A and rs1104760 G alleles with increased incidence of RPL. In addition, the MUC4 rs882605 CA/MUC4 rs2258447 CC genotype combination was associated with increased RPL prevalence. The two exonic polymorphisms lead to amino acid changes of protein and may act as pathogenic variants for RPL. In conclusion, the MUC4 rs882605 C>A and MUC4 rs1104760 A>G polymorphisms were associated with the susceptibility of RPL and we considered them as potential biomarkers for RPL.
Collapse
Affiliation(s)
- Ji-Hyang Kim
- Department of Obstetrics and Gynecology, CHA Bundang Medical Center, CHA University, Seongnam 13496, Korea; (J.-H.K.); (Y.-R.K.)
| | - Han-Sung Park
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.-S.P.); (J.-Y.L.); (E.-J.K.)
| | - Jeong-Yong Lee
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.-S.P.); (J.-Y.L.); (E.-J.K.)
| | - Eun-Ju Ko
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.-S.P.); (J.-Y.L.); (E.-J.K.)
| | - Young-Ran Kim
- Department of Obstetrics and Gynecology, CHA Bundang Medical Center, CHA University, Seongnam 13496, Korea; (J.-H.K.); (Y.-R.K.)
| | - Hee-Young Cho
- Department of Obstetrics and Gynecology, CHA Gangnam Medical Center, CHA University, Seoul 06135, Korea;
| | - Woo-Sik Lee
- Fertility Center of CHA Gangnam Medical Center, CHA University, Seoul 06135, Korea;
| | - Eun-Hee Ahn
- Department of Obstetrics and Gynecology, CHA Bundang Medical Center, CHA University, Seongnam 13496, Korea; (J.-H.K.); (Y.-R.K.)
| | - Nam-Keun Kim
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.-S.P.); (J.-Y.L.); (E.-J.K.)
| |
Collapse
|
6
|
Li JR, Tang M, Li Y, Amos CI, Cheng C. Genetic variants associated mRNA stability in lung. BMC Genomics 2022; 23:196. [PMID: 35272635 PMCID: PMC8915503 DOI: 10.1186/s12864-022-08405-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Accepted: 02/21/2022] [Indexed: 12/04/2022] Open
Abstract
Background Expression quantitative trait loci (eQTLs) analyses have been widely used to identify genetic variants associated with gene expression levels to understand what molecular mechanisms underlie genetic traits. The resultant eQTLs might affect the expression of associated genes through transcriptional or post-transcriptional regulation. In this study, we attempt to distinguish these two types of regulation by identifying genetic variants associated with mRNA stability of genes (stQTLs). Results Here, we presented a computational framework that takes advantage of recently developed methods to infer the mRNA stability of genes based on RNA-seq data and performed association analysis to identify stQTLs. Using the Genotype-Tissue Expression (GTEx) lung RNA-Seq data, we identified a total of 142,801 stQTLs for 3942 genes and 186,132 eQTLs for 4751 genes from 15,122,700 genetic variants for 13,476 genes on the autosomes, respectively. Interestingly, our results indicated that stQTLs were enriched in the CDS and 3’UTR regions, while eQTLs are enriched in the CDS, 3’UTR, 5’UTR, and upstream regions. We also found that stQTLs are more likely than eQTLs to overlap with RNA binding protein (RBP) and microRNA (miRNA) binding sites. Our analyses demonstrate that simultaneous identification of stQTLs and eQTLs can provide more mechanistic insight on the association between genetic variants and gene expression levels. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-022-08405-y.
Collapse
Affiliation(s)
- Jian-Rong Li
- Department of Medicine, Baylor College of Medicine, Houston, TX, USA.,Institute for Clinical and Translational Research, Baylor College of Medicine, Houston, TX, USA
| | - Mabel Tang
- Department of BioSciences, Biochemistry and Cell Biology, Rice University, Houston, TX, USA
| | - Yafang Li
- Department of Medicine, Baylor College of Medicine, Houston, TX, USA.,Institute for Clinical and Translational Research, Baylor College of Medicine, Houston, TX, USA.,Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA
| | - Christopher I Amos
- Department of Medicine, Baylor College of Medicine, Houston, TX, USA.,Institute for Clinical and Translational Research, Baylor College of Medicine, Houston, TX, USA.,Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA
| | - Chao Cheng
- Department of Medicine, Baylor College of Medicine, Houston, TX, USA. .,Institute for Clinical and Translational Research, Baylor College of Medicine, Houston, TX, USA. .,Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA.
| |
Collapse
|
7
|
Feature Selection for Colon Cancer Detection Using K-Means Clustering and Modified Harmony Search Algorithm. MATHEMATICS 2021. [DOI: 10.3390/math9050570] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This paper proposes a feature selection method that is effective in distinguishing colorectal cancer patients from normal individuals using K-means clustering and the modified harmony search algorithm. As the genetic cause of colorectal cancer originates from mutations in genes, it is important to classify the presence or absence of colorectal cancer through gene information. The proposed methodology consists of four steps. First, the original data are Z-normalized by data preprocessing. Candidate genes are then selected using the Fisher score. Next, one representative gene is selected from each cluster after candidate genes are clustered using K-means clustering. Finally, feature selection is carried out using the modified harmony search algorithm. The gene combination created by feature selection is then applied to the classification model and verified using 5-fold cross-validation. The proposed model obtained a classification accuracy of up to 94.36%. Furthermore, on comparing the proposed method with other methods, we prove that the proposed method performs well in classifying colorectal cancer. Moreover, we believe that the proposed model can be applied not only to colorectal cancer but also to other gene-related diseases.
Collapse
|
8
|
Nie G, Liu X, Zhou X, Song Q, Fu M, Xu F, Wang X. Functional analysis of a novel cryptochrome gene ( GbCRY1) from Ginkgo biloba. PLANT SIGNALING & BEHAVIOR 2021; 16:1850627. [PMID: 33258712 PMCID: PMC7849775 DOI: 10.1080/15592324.2020.1850627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 11/09/2020] [Accepted: 11/10/2020] [Indexed: 06/12/2023]
Abstract
Cryptochrome (CRY) is a blue light receptor that is widely distributed in animals, plants, and microorganisms. CRY as a coding gene of cryptochrome that regulates the organism gene expression and plays an important role in organism growth and development. In this study, we identified four photolyase/cryptochrome (PHR/CRY) members from the genome of Ginkgo biloba. Phylogenetic tree analysis showed that the Ginkgo PHR/CRY family members were closely related to Arabidopsis thaliana and Solanum lycopersicum. We isolated a cryptochrome gene, GbCRY1, from G. biloba and analyzed its structure and function. GbCRY1 shared high similarity with AtCRY1 from A. thaliana. GbCRY1 expression level was higher in stems and leaves and lower in roots, male strobili, female strobili. GbCRY1 expression level fluctuated periodically within 24 h, gradually increased in the dark, and decreased under blue light. The newly germinated ginkgo seedlings were cultured under dark, white light, and blue light conditions. The blue light normally induced photomorphogenesis of ginkgo seedlings, which included hypocotyl elongation inhibition, leaf expansion inhibition, and chlorophyll formation. Treating dark-adapted ginkgo leaves with blue light could induce stomatal opening. At the same time, blue light reduced the expression level of GbCRY1 in the process of inducing photomorphogenesis and stoma opening. Our results provide evidence that GbCRY1 expression is affected by space, circadian cycle and light, and also proves that GbCRY1 is related to ginkgo circadian clock, photomorphogenesis and stoma opening process.
Collapse
Affiliation(s)
- Gongping Nie
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Xiaomeng Liu
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Xian Zhou
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Qiling Song
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Mingyue Fu
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Feng Xu
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Xuefeng Wang
- College of Art, Yangtze University, Jingzhou, Hubei, China
| |
Collapse
|
9
|
Hu H, Jiang M, Cao Y, Zhang Z, Jiang B, Tian F, Feng J, Dou Y, Gorospe M, Zheng M, Zheng L, Yang Z, Wang W. HuR regulates phospholamban expression in isoproterenol-induced cardiac remodelling. Cardiovasc Res 2020; 116:944-955. [PMID: 31373621 DOI: 10.1093/cvr/cvz205] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 06/30/2019] [Accepted: 08/01/2019] [Indexed: 12/29/2022] Open
Abstract
AIMS The elevated expression of phospholamban (PLB) has been observed in heart failure and cardiac remodelling, inhibiting the affinity of Ca2+ pump to Ca2+ thereby impairing heart relaxation. However, the mechanisms underlying the regulation of PLB remains to be further studied. The present study aims to test the role of RNA-binding protein HuR in the regulation of PLB and the impact of this regulatory process in cardiac remodelling. METHODS AND RESULTS A mouse model specifically deleted HuR in cardiomyocytes were used for testing the role of HuR in regulating PLB during isoproterenol (ISO)-induced cardiac remodelling. HuR deficiency did not significantly influence the phenotype and function of mouse heart under static status. However, deletion of HuR in cardiomyocytes mitigated the effect of ISO in inducing PLB expression and reducing β1-AR expression, in turn aggravating ISO-induced myocardial hypertrophy and cardiac fibrosis. In H9C2 cells, association of HuR with PLB and β1-AR mRNAs stabilized PLB mRNA and destabilized β1-AR mRNA, respectively. CONCLUSION HuR stabilizes PLB mRNA and destabilizes β1-AR mRNA. The HuR-PLB and HuR-β1-AR regulatory processes impact on ISO-induced cardiac remodelling.
Collapse
Affiliation(s)
- Han Hu
- >Department of Biochemistry and Molecular Biology, Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Beijing 100191, China
| | - Mingyang Jiang
- Department of Cardiology, State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China
| | - Yangpo Cao
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road Beijing, 100191, China
| | - Zhuojun Zhang
- >Department of Biochemistry and Molecular Biology, Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Beijing 100191, China
| | - Bin Jiang
- >Department of Biochemistry and Molecular Biology, Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Beijing 100191, China
| | - Feng Tian
- Department of Laboratory Animal Science, Peking University Health Science Center, 38 Xueyuan Road, Beijing 100191, China
| | - Juan Feng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road Beijing, 100191, China
| | - Yali Dou
- Department of Pathology and Biological Chemistry, University of Michigan, 1301 Catherine Street, Ann Arbor, MI 48105, USA
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, 251 Bayview Blvd, Baltimore, MD 21224, USA
| | - Ming Zheng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road Beijing, 100191, China
| | - Lemin Zheng
- Institute of Cardiovascular Research, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Beijing 100191, China
| | - Zhongzhou Yang
- Department of Cardiology, State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China
| | - Wengong Wang
- >Department of Biochemistry and Molecular Biology, Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Beijing 100191, China
| |
Collapse
|
10
|
Qin Y, Li L, Luo E, Hou J, Yan G, Wang D, Qiao Y, Tang C. Role of m6A RNA methylation in cardiovascular disease (Review). Int J Mol Med 2020; 46:1958-1972. [PMID: 33125109 PMCID: PMC7595665 DOI: 10.3892/ijmm.2020.4746] [Citation(s) in RCA: 140] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 09/29/2020] [Indexed: 02/07/2023] Open
Abstract
N6-methyladenosine (m6A) is the most prevalent and abundant type of internal post-transcriptional RNA modification in eukaryotic cells. Multiple types of RNA, including mRNAs, rRNAs, tRNAs, long non-coding RNAs and microRNAs, are involved in m6A methylation. The biological function of m6A modification is dynamically and reversibly mediated by methyltransferases (writers), demethylases (erasers) and m6A binding proteins (readers). The methyltransferase complex is responsible for the catalyzation of m6A modification and is typically made up of methyltransferase-like (METTL)3, METTL14 and Wilms tumor 1-associated protein. Erasers remove methylation by fat mass and obesity-associated protein and ALKB homolog 5. Readers play a role through the recognition of m6A-modified targeted RNA. The YT521-B homology domain family, heterogeneous nuclear ribonucleoprotein and insulin-like growth factor 2 mRNA-binding protein serve as m6A readers. The m6A methylation on transcripts plays a pivotal role in the regulation of downstream molecular events and biological functions, such as RNA splicing, transport, stability and translatability at the post-transcriptional level. The dysregulation of m6A modification is associated with cancer, drug resistance, virus replication and the pluripotency of embryonic stem cells. Recently, a number of studies have identified aberrant m6A methylation in cardiovascular diseases (CVDs), including cardiac hypertrophy, heart failure, arterial aneurysm, vascular calcification and pulmonary hypertension. The aim of the present review article was to summarize the recent research progress on the role of m6A modification in CVD and give a brief perspective on its prospective applications in CVD.
Collapse
Affiliation(s)
- Yuhan Qin
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
| | - Linqing Li
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
| | - Erfei Luo
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
| | - Jiantong Hou
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
| | - Gaoliang Yan
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
| | - Dong Wang
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
| | - Yong Qiao
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
| | - Chengchun Tang
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
| |
Collapse
|
11
|
Kim JH, Kim TH, Kim YS, Jang WC, Ryu A, Hwang JY, Lee HH. Mucin gene polymorphisms are associated with endometriosis in Korean women. Arch Gynecol Obstet 2019; 301:801-807. [PMID: 31858233 DOI: 10.1007/s00404-019-05409-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Accepted: 12/07/2019] [Indexed: 11/27/2022]
Abstract
OBJECTIVE Mucin family members mucin 1 (MUC1) and mucin 4 (MUC4) play an important role in transformation and adhesion, and are known markers for the detection of cancer. However, the pathophysiology of endometriosis associated with the mucin gene is unclear. In this study, we analyzed the relationship between MUC1 and MUC4 single-nucleotide polymorphisms (SNPs) and the risk for endometriosis. METHODS We performed a case-controlled study of 29 endometriosis clinical samples and 27 functional cysts as control. Sixteen SNPs (rs145224844, rs139620330, rs144273480, rs1611770, rs146141676, rs201798179, rs201815857, rs199840128, rs200788986, rs141460657, rs183700327, rs199768496, rs191544901, rs200639498, rs148332231, and rs11465209) of MUC1 gene and eight SNPs (rs1104760, rs1106502, rs882605, rs2291651, rs2291652, rs2291653, rs2291654, and rs375068067) of the MUC4 gene were identified. We amplified SNP sites by polymerase chain reaction (PCR) using specific primer sets followed by DNA sequencing. RESULTS The single mutation analysis of MUC4 showed that MUC4 mutations had no effect on the risk for endometriosis, but the frequencies of haplotypes [T/T + T/T + C/C] (rs2291653, 2291654 and rs375068067) were associated with endometriosis. CONCLUSION The MUC1 genotype may not be correlated with endometriosis susceptibility. However, MUC4 polymorphisms are associated with the risk for endometriosis in Korean women.
Collapse
Affiliation(s)
- Jin-Ho Kim
- Institue of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan, Republic of Korea
- Department of Chemistry, College of Natural Science, Dankook University, Cheonan, Republic of Korea
| | - Tae-Hee Kim
- Department of Obstetrics and Gynecology, College of Medicine, Soonchunhyang University Bucheon Hospital, 170 Jomaru-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 14584, Republic of Korea
| | - Yeon-Suk Kim
- Department of Obstetrics and Gynecology, College of Medicine, Soonchunhyang University Bucheon Hospital, 170 Jomaru-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 14584, Republic of Korea
- Department of Interdisciplinary Program in Biomedical Science, Soonchunhyang University Graduate School, Asan, 31538, Republic of Korea
| | - Won-Cheoul Jang
- Department of Chemistry, College of Natural Science, Dankook University, Cheonan, Republic of Korea
| | - Aeli Ryu
- Department of Obstetrics and Gynecology, College of Medicine, Soonchunhyang University Cheonan Hospital, Cheonan, Republic of Korea
| | - Ji-Young Hwang
- Laboratory of Carbon and Biomedical Engineering, Korea Institute of Carbon Convergence, Jeonju, Republic of Korea.
| | - Hae-Hyeog Lee
- Department of Obstetrics and Gynecology, College of Medicine, Soonchunhyang University Bucheon Hospital, 170 Jomaru-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 14584, Republic of Korea.
| |
Collapse
|
12
|
Song H, Feng X, Zhang H, Luo Y, Huang J, Lin M, Jin J, Ding X, Wu S, Huang H, Yu T, Zhang M, Hong H, Yao S, Zhao Y, Zhang Z. METTL3 and ALKBH5 oppositely regulate m 6A modification of TFEB mRNA, which dictates the fate of hypoxia/reoxygenation-treated cardiomyocytes. Autophagy 2019; 15:1419-1437. [PMID: 30870073 PMCID: PMC6613905 DOI: 10.1080/15548627.2019.1586246] [Citation(s) in RCA: 317] [Impact Index Per Article: 63.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 01/25/2019] [Accepted: 02/07/2019] [Indexed: 01/19/2023] Open
Abstract
N6-methyladenosine (m6A) mRNA modifications play critical roles in various biological processes. However, no study addresses the role of m6A in macroautophagy/autophagy. Here, we show that m6A modifications are increased in H/R-treated cardiomyocytes and ischemia/reperfusion (I/R)-treated mice heart. We found that METTL3 (methyltransferase like 3) is the primary factor involved in aberrant m6A modification. Silencing METTL3 enhances autophagic flux and inhibits apoptosis in H/R-treated cardiomyocytes. However, overexpression of METTL3 or inhibition of the RNA demethylase ALKBH5 has an opposite effect, suggesting that METTL3 is a negative regulator of autophagy. Mechanistically, METTL3 methylates TFEB, a master regulator of lysosomal biogenesis and autophagy genes, at two m6A residues in the 3'-UTR, which promotes the association of the RNA-binding protein HNRNPD with TFEB pre-mRNA and subsequently decreases the expression levels of TFEB. Further experiments show that autophagic flux enhanced by METTL3 deficiency is TFEB dependent. In turn, TFEB regulates the expression levels of METTL3 and ALKBH5 in opposite directions: it induces ALKBH5 and inhibits METTL3. TFEB binds to the ALKBH5 promoter and activates its transcription. In contrast, inhibition of METTL3 by TFEB does not involve transcriptional repression but rather downregulation of mRNA stability, thereby establishing a negative feedback loop. Together, our work uncovers a critical link between METTL3-ALKBH5 and autophagy, providing insight into the functional importance of the reversible mRNA m6A methylation and its modulators in ischemic heart disease. Abbreviations: ACTB, actin beta; ALKBH5, alkB homolog 5, RNA demethylase; ANXA5, annexin A5; ATG, autophagy-related; BafA, bafilomycin A1; CASP3, caspase 3; ELAVL1, ELAV like RNA binding protein 1; FTO, FTO, alpha-ketoglutarate dependent dioxygenase; GFP, green fluorescent protein; GST, glutathione S-transferase; HNRNPD, heterogeneous nuclear ribonucleoprotein D; H/R, hypoxia/reoxygenation; I/R, ischemia/reperfusion; LAD, left anterior descending; m6A, N6-methyladenosine; MEFs, mouse embryo fibroblasts; Mer, mutated estrogen receptor domains; METTL3, methyltransferase like 3; METTL14, methyltransferase like 14; mRFP, monomeric red fluorescent protein; MTORC1, mechanistic target of rapamycin kinase complex 1; NMVCs, neonatal mouse ventricular cardiomyocytes; PCNA, proliferating cell nuclear antigen; PE, phosphatidylethanolamine; PI, propidium iodide; PTMs, post-translational modifications; PVDF, polyvinylidenedifluoride; RIP, RNA-immunoprecipitation; siRNA, small interfering RNA; SQSTM1, sequestosome 1; TFEB, transcription factor EB; TUBA: tublin alpha; WTAP, WT1 associated protein; YTHDF, YTH N6-methyladenosine RNA binding protein.
Collapse
Affiliation(s)
- Huiwen Song
- Longju Medical Research Center; Key Laboratory of Basic Pharmacology of Ministry of Education, Zunyi Medical University, Zunyi, China
- Department of Cardiology, Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai, China
| | - Xing Feng
- Longju Medical Research Center; Key Laboratory of Basic Pharmacology of Ministry of Education, Zunyi Medical University, Zunyi, China
- Rutgers Cancer Institute of New Jersey, Rutgers University, New Brunswick, NJ, USA
| | - Heng Zhang
- Department of Histology and Embryology, Xiang Ya School of Medicine, Central South University, Changsha, China
| | - Yunmei Luo
- Longju Medical Research Center; Key Laboratory of Basic Pharmacology of Ministry of Education, Zunyi Medical University, Zunyi, China
| | - Juan Huang
- Longju Medical Research Center; Key Laboratory of Basic Pharmacology of Ministry of Education, Zunyi Medical University, Zunyi, China
| | - Meihua Lin
- Research Center of Clinical Pharmacy, State Key Laboratory for Diagnosis and Treatment of Infectious Disease, First Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Junfei Jin
- Laboratory of Hepatobiliary and Pancreatic Surgery, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Xue Ding
- Department of Cardiology; the First Affiliated Hospital, Harbin Medical University, Harbin, China
| | - Shujing Wu
- Department of Cardiology, The ChengGong Hospital Affiliated to Xiamen University, Xiamen, China
| | - He Huang
- Department of Histology and Embryology, Xiang Ya School of Medicine, Central South University, Changsha, China
- Digestive Cancer Laboratory, Second Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Tian Yu
- Department of Anesthesia, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Mukun Zhang
- Health Management Center, The First Affiliated Hospital of USTC (Anhui Provincial Hospital), Hefei, China
| | - Haiou Hong
- Health Management Center, The First Affiliated Hospital of USTC (Anhui Provincial Hospital), Hefei, China
| | - Shihua Yao
- Department of Thoracic Surgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Yongxiang Zhao
- National Center for International Research of Biological Targeting Diagnosis and Therapy (Guangxi Key Laboratory of Biological Targeting Diagnosis and Therapy Research), Guangxi Medical University, Nanning, China
| | - Zhiyong Zhang
- Longju Medical Research Center; Key Laboratory of Basic Pharmacology of Ministry of Education, Zunyi Medical University, Zunyi, China
- Department of Surgery; Robert-Wood-Johnson Medical School University Hospital, Rutgers University, State University of New Jersey, New Brunswick, NJ USA
| |
Collapse
|
13
|
Cardiovascular inflammation: RNA takes the lead. J Mol Cell Cardiol 2019; 129:247-256. [PMID: 30880251 DOI: 10.1016/j.yjmcc.2019.03.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 03/12/2019] [Accepted: 03/13/2019] [Indexed: 12/19/2022]
Abstract
Inflammation has recently gained tremendous attention as a key contributor in several chronic diseases. While physiological inflammation is essential to counter a wide variety of damaging stimuli and to improve wound healing, dysregulated inflammation such as in the myocardium and vasculature can promote cardiovascular diseases. Given the high severity, prevalence, and economic burden of these diseases, understanding the factors involved in the regulation of physiological inflammation is essential. Like other complex biological phenomena, RNA-based processes are emerging as major regulators of inflammatory responses. Among such processes are cis-regulatory elements in the mRNA of inflammatory genes, noncoding RNAs directing the production or localization of inflammatory cytokines/chemokines, or pathogenic RNA driving inflammatory responses. In this review, we describe several specific RNA-based molecular mechanisms by which physiological inflammation pertaining to cardiovascular diseases is regulated. These include the role of AU-rich element-containing mRNAs, long non-coding RNAs, microRNAs, and viral RNAs.
Collapse
|
14
|
Mohan N, Kumar V, Kandala DT, Kartha CC, Laishram RS. A Splicing-Independent Function of RBM10 Controls Specific 3′ UTR Processing to Regulate Cardiac Hypertrophy. Cell Rep 2018; 24:3539-3553. [DOI: 10.1016/j.celrep.2018.08.077] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 06/09/2018] [Accepted: 08/24/2018] [Indexed: 10/28/2022] Open
|
15
|
Gu L, Wang H, Wang J, Guo Y, Tang Y, Mao Y, Chen L, Lou H, Ji G. Reconstitution of HuR-Inhibited CUGBP1 Expression Protects Cardiomyocytes from Acute Myocardial Infarction-Induced Injury. Antioxid Redox Signal 2017; 27:1013-1026. [PMID: 28350193 DOI: 10.1089/ars.2016.6880] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AIM Myocardial infarction (MI) is one of the leading causes of death in elderly people. Expanding the knowledge of the molecular mechanisms underlying MI is of profound importance to developing a cure for MI. The CUGBP- and ETR-3-like factor (CELF) proteins, a family of RNA-binding proteins, play key roles in RNA metabolism. To determine the functions and molecular mechanisms of CELF proteins in MI, an animal model of acute myocardial infarction (AMI) was used in our study. RESULTS We found that the CUG triplet repeat RNA-binding protein 1 (CUGBP1)/CELF1 expression levels were decreased in AMI-injured hearts, and further studies showed that two highly conserved adenylate-uridylate-rich (AU-rich) elements in the 3'UTR of CUGBP1 were responsible for the decreased CUGBP1 expression. Upon AMI, human antigen R (HuR) was relocated to the cytoplasm from the nucleus and interacted with these AU-rich elements to affect the expression of CUGBP1. Reintroduction of CUGBP1 via gene delivery by recombinant adenovirus improved cardiac function in AMI mice. Our studies also indicated that CUGBP1 protected cardiomyocytes from ischemia-induced injury through the promotion of angiogenesis and inhibition of apoptosis by regulating the vascular endothelial growth factor-A gene. Innovation and Conclusion: Our studies indicate a role for CUGBP1 in cardiac disease and reveal a novel MI post-transcriptional gene regulatory mechanism. The reconstitution of CUGBP1 could be developed as a potential therapeutic option for the management of MI. Antioxid. Redox Signal. 27, 1013-1026.
Collapse
Affiliation(s)
- Lei Gu
- 1 National Laboratory of Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences, Beijing, China .,2 University of the Chinese Academy of Sciences , Beijing, China
| | - Huiwen Wang
- 1 National Laboratory of Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences, Beijing, China
| | - Jun Wang
- 1 National Laboratory of Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences, Beijing, China .,2 University of the Chinese Academy of Sciences , Beijing, China
| | - Yuting Guo
- 1 National Laboratory of Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences, Beijing, China .,2 University of the Chinese Academy of Sciences , Beijing, China
| | - Yinglong Tang
- 1 National Laboratory of Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences, Beijing, China
| | - Yang Mao
- 1 National Laboratory of Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences, Beijing, China .,2 University of the Chinese Academy of Sciences , Beijing, China
| | - Lijuan Chen
- 3 Beijing Institutes of Life Science , Chinese Academy of Sciences, Beijing, China
| | - Hua Lou
- 4 Department of Genetics and Genome Sciences, School of Medicine, Case Western Reserve University , Cleveland, Ohio
| | - Guangju Ji
- 1 National Laboratory of Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences, Beijing, China
| |
Collapse
|
16
|
Esnault S, Shen ZJ, Malter JS. Protein Translation and Signaling in Human Eosinophils. Front Med (Lausanne) 2017; 4:150. [PMID: 28971096 PMCID: PMC5609579 DOI: 10.3389/fmed.2017.00150] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 09/01/2017] [Indexed: 01/01/2023] Open
Abstract
We have recently reported that, unlike IL-5 and GM-CSF, IL-3 induces increased translation of a subset of mRNAs. In addition, we have demonstrated that Pin1 controls the activity of mRNA binding proteins, leading to enhanced mRNA stability, GM-CSF protein production and prolonged eosinophil (EOS) survival. In this review, discussion will include an overview of cap-dependent protein translation and its regulation by intracellular signaling pathways. We will address the more general process of mRNA post-transcriptional regulation, especially regarding mRNA binding proteins, which are critical effectors of protein translation. Furthermore, we will focus on (1) the roles of IL-3-driven sustained signaling on enhanced protein translation in EOS, (2) the mechanisms regulating mRNA binding proteins activity in EOS, and (3) the potential targeting of IL-3 signaling and the signaling leading to mRNA binding activity changes to identify therapeutic targets to treat EOS-associated diseases.
Collapse
Affiliation(s)
- Stephane Esnault
- Department of Medicine, Allergy, Pulmonary, and Critical Care Medicine Division, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, United States
| | - Zhong-Jian Shen
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - James S Malter
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX, United States
| |
Collapse
|
17
|
Mendoza-Viveros L, Bouchard-Cannon P, Hegazi S, Cheng AH, Pastore S, Cheng HYM. Molecular modulators of the circadian clock: lessons from flies and mice. Cell Mol Life Sci 2017; 74:1035-1059. [PMID: 27689221 PMCID: PMC11107503 DOI: 10.1007/s00018-016-2378-8] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Revised: 09/03/2016] [Accepted: 09/22/2016] [Indexed: 12/16/2022]
Abstract
Circadian timekeeping is a ubiquitous mechanism that enables organisms to maintain temporal coordination between internal biological processes and time of the local environment. The molecular basis of circadian rhythms lies in a set of transcription-translation feedback loops (TTFLs) that drives the rhythmic transcription of core clock genes, whose level and phase of expression serve as the marker of circadian time. However, it has become increasingly evident that additional regulatory mechanisms impinge upon the TTFLs to govern the properties and behavior of the circadian clock. Such mechanisms include changes in chromatin architecture, interactions with other transcription factor networks, post-transcriptional control by RNA modifications, alternative splicing and microRNAs, and post-translational regulation of subcellular trafficking and protein degradation. In this review, we will summarize the current knowledge of circadian clock regulation-from transcriptional to post-translational-drawing from literature pertaining to the Drosophila and murine circadian systems.
Collapse
Affiliation(s)
- Lucia Mendoza-Viveros
- Department of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON, L5L 1C6, Canada
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, ON, M5S 3G5, Canada
| | - Pascale Bouchard-Cannon
- Department of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON, L5L 1C6, Canada
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, ON, M5S 3G5, Canada
| | - Sara Hegazi
- Department of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON, L5L 1C6, Canada
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, ON, M5S 3G5, Canada
| | - Arthur H Cheng
- Department of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON, L5L 1C6, Canada
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, ON, M5S 3G5, Canada
| | - Stephen Pastore
- Department of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON, L5L 1C6, Canada
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, ON, M5S 3G5, Canada
| | - Hai-Ying Mary Cheng
- Department of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON, L5L 1C6, Canada.
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, ON, M5S 3G5, Canada.
| |
Collapse
|
18
|
Mucaki EJ, Caminsky NG, Perri AM, Lu R, Laederach A, Halvorsen M, Knoll JHM, Rogan PK. A unified analytic framework for prioritization of non-coding variants of uncertain significance in heritable breast and ovarian cancer. BMC Med Genomics 2016; 9:19. [PMID: 27067391 PMCID: PMC4828881 DOI: 10.1186/s12920-016-0178-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 03/15/2016] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Sequencing of both healthy and disease singletons yields many novel and low frequency variants of uncertain significance (VUS). Complete gene and genome sequencing by next generation sequencing (NGS) significantly increases the number of VUS detected. While prior studies have emphasized protein coding variants, non-coding sequence variants have also been proven to significantly contribute to high penetrance disorders, such as hereditary breast and ovarian cancer (HBOC). We present a strategy for analyzing different functional classes of non-coding variants based on information theory (IT) and prioritizing patients with large intragenic deletions. METHODS We captured and enriched for coding and non-coding variants in genes known to harbor mutations that increase HBOC risk. Custom oligonucleotide baits spanning the complete coding, non-coding, and intergenic regions 10 kb up- and downstream of ATM, BRCA1, BRCA2, CDH1, CHEK2, PALB2, and TP53 were synthesized for solution hybridization enrichment. Unique and divergent repetitive sequences were sequenced in 102 high-risk, anonymized patients without identified mutations in BRCA1/2. Aside from protein coding and copy number changes, IT-based sequence analysis was used to identify and prioritize pathogenic non-coding variants that occurred within sequence elements predicted to be recognized by proteins or protein complexes involved in mRNA splicing, transcription, and untranslated region (UTR) binding and structure. This approach was supplemented by in silico and laboratory analysis of UTR structure. RESULTS 15,311 unique variants were identified, of which 245 occurred in coding regions. With the unified IT-framework, 132 variants were identified and 87 functionally significant VUS were further prioritized. An intragenic 32.1 kb interval in BRCA2 that was likely hemizygous was detected in one patient. We also identified 4 stop-gain variants and 3 reading-frame altering exonic insertions/deletions (indels). CONCLUSIONS We have presented a strategy for complete gene sequence analysis followed by a unified framework for interpreting non-coding variants that may affect gene expression. This approach distills large numbers of variants detected by NGS to a limited set of variants prioritized as potential deleterious changes.
Collapse
Affiliation(s)
- Eliseos J Mucaki
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, ON, N6A 2C1, Canada
| | - Natasha G Caminsky
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, ON, N6A 2C1, Canada
| | - Ami M Perri
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, ON, N6A 2C1, Canada
| | - Ruipeng Lu
- Department of Computer Science, Faculty of Science, Western University, London, N6A 2C1, Canada
| | - Alain Laederach
- Department of Biology, University of North Carolina, Chapel Hill, NC, 27599-3290, USA
| | - Matthew Halvorsen
- Institute for Genomic Medicine, Columbia University Medical Center, New York, NY, 10032, USA
| | - Joan H M Knoll
- Department of Pathology and Laboratory Medicine, Schulich School of Medicine and Dentistry, Western University, London, N6A 2C1, Canada
- Cytognomix Inc., London, Canada
| | - Peter K Rogan
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, ON, N6A 2C1, Canada.
- Department of Computer Science, Faculty of Science, Western University, London, N6A 2C1, Canada.
- Cytognomix Inc., London, Canada.
- Department of Oncology, Schulich School of Medicine and Dentistry, Western University, London, N6A 2C1, Canada.
| |
Collapse
|
19
|
Florath I, Butterbach K, Heiss J, Bewerunge-Hudler M, Zhang Y, Schöttker B, Brenner H. Type 2 diabetes and leucocyte DNA methylation: an epigenome-wide association study in over 1,500 older adults. Diabetologia 2016; 59:130-138. [PMID: 26433941 DOI: 10.1007/s00125-015-3773-7] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 09/08/2015] [Indexed: 12/20/2022]
Abstract
AIMS/HYPOTHESIS Development of type 2 diabetes depends on environmental and genetic factors. We investigated the epigenome-wide association of prevalent diabetes with DNA methylation (DNAm) in peripheral blood. METHODS DNAm was measured in whole blood with the Illumina Infinium HumanMethylation450 BeadChip in two subsamples of participants from the ESTHER cohort study. Cohort 1 included 988 participants, who were consecutively recruited between July and October 2000 and cohort 2 included 527 randomly selected participants. The association of DNAm with prevalent type 2 diabetes at recruitment was estimated using median regression analysis adjusting for sex, age, BMI, smoking behaviour, cell composition and batch at 361,922 CpG sites. RESULTS Type 2 diabetes was prevalent in 16% of the participants, and diabetes was poorly controlled in 45% of the diabetic patients. In cohort 1 (discovery) DNAm at 39 CpGs was significantly associated with prevalent diabetes after correction for multiple testing. In cohort 2 (replication) at one of these CpGs, DNAm was still significantly associated. Decreasing methylation levels at cg19693031 with increasing fasting glucose and HbA1c concentrations were observed using restricted cubic spline analysis. In diabetic patients with poorly controlled diabetes, the decrease in estimated DNAm levels was approximately 5% in comparison with participants free of diagnosed diabetes. CONCLUSIONS/INTERPRETATION Cg19693031, which is located within the 3'-untranslated region of TXNIP, might play a role in the pathophysiology of type 2 diabetes. This result appears biologically plausible given that thioredoxin-interacting protein is overexpressed in diabetic animals and humans and 3'-untranslated regions are known to play a regulatory role in gene expression.
Collapse
Affiliation(s)
- Ines Florath
- Division of Clinical Epidemiology and Aging Research (C070), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 581, 69120, Heidelberg, Germany.
| | - Katja Butterbach
- Division of Clinical Epidemiology and Aging Research (C070), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 581, 69120, Heidelberg, Germany
| | - Jonathan Heiss
- Division of Clinical Epidemiology and Aging Research (C070), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 581, 69120, Heidelberg, Germany
| | | | - Yan Zhang
- Division of Clinical Epidemiology and Aging Research (C070), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 581, 69120, Heidelberg, Germany
| | - Ben Schöttker
- Division of Clinical Epidemiology and Aging Research (C070), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 581, 69120, Heidelberg, Germany
| | - Hermann Brenner
- Division of Clinical Epidemiology and Aging Research (C070), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 581, 69120, Heidelberg, Germany
- Division of Preventive Oncology, German Cancer Research Center (DKFZ) and National Center for Tumor Diseases (NCT), Heidelberg, Germany
- German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany
| |
Collapse
|
20
|
Lee JH, Kim SJ, Lee SY, Hwang JW, Suh IB. Association of PER2 and CRY1 Polymorphisms with the Morningness-Eveningness in Korean Adults. SLEEP MEDICINE RESEARCH 2015. [DOI: 10.17241/smr.2015.6.2.60] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
|
21
|
D'Agostino VG, Lal P, Mantelli B, Tiedje C, Zucal C, Thongon N, Gaestel M, Latorre E, Marinelli L, Seneci P, Amadio M, Provenzani A. Dihydrotanshinone-I interferes with the RNA-binding activity of HuR affecting its post-transcriptional function. Sci Rep 2015; 5:16478. [PMID: 26553968 PMCID: PMC4639722 DOI: 10.1038/srep16478] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 10/14/2015] [Indexed: 01/07/2023] Open
Abstract
Post-transcriptional regulation is an essential determinant of gene expression programs in physiological and pathological conditions. HuR is a RNA-binding protein that orchestrates the stabilization and translation of mRNAs, critical in inflammation and tumor progression, including tumor necrosis factor-alpha (TNF). We identified the low molecular weight compound 15,16-dihydrotanshinone-I (DHTS), well known in traditional Chinese medicine practice, through a validated high throughput screening on a set of anti-inflammatory agents for its ability to prevent HuR:RNA complex formation. We found that DHTS interferes with the association step between HuR and the RNA with an equilibrium dissociation constant in the nanomolar range in vitro (Ki = 3.74 ± 1.63 nM). In breast cancer cell lines, short term exposure to DHTS influences mRNA stability and translational efficiency of TNF in a HuR-dependent manner and also other functional readouts of its post-transcriptional control, such as the stability of selected pre-mRNAs. Importantly, we show that migration and sensitivity of breast cancer cells to DHTS are modulated by HuR expression, indicating that HuR is among the preferential intracellular targets of DHTS. Here, we disclose a previously unrecognized molecular mechanism exerted by DHTS, opening new perspectives to therapeutically target the HuR mediated, post-transcriptional control in inflammation and cancer cells.
Collapse
Affiliation(s)
| | - Preet Lal
- Centre For Integrative Biology (CIBIO), University of Trento, Trento, 38123, Italy
| | - Barbara Mantelli
- Centre For Integrative Biology (CIBIO), University of Trento, Trento, 38123, Italy
| | - Christopher Tiedje
- Department of Biochemistry, Hannover Medical University, Hannover, D-30625, Germany
| | - Chiara Zucal
- Centre For Integrative Biology (CIBIO), University of Trento, Trento, 38123, Italy
| | - Natthakan Thongon
- Centre For Integrative Biology (CIBIO), University of Trento, Trento, 38123, Italy
| | - Matthias Gaestel
- Department of Biochemistry, Hannover Medical University, Hannover, D-30625, Germany
| | - Elisa Latorre
- Centre For Integrative Biology (CIBIO), University of Trento, Trento, 38123, Italy
| | - Luciana Marinelli
- Department of Pharmacy, University of Naples "Federico II", Naples, 80131, Italy
| | | | - Marialaura Amadio
- Department of Drug Sciences, University of Pavia, Pavia, 27100, Italy
| | | |
Collapse
|
22
|
Shen ZJ, Malter JS. Regulation of AU-Rich Element RNA Binding Proteins by Phosphorylation and the Prolyl Isomerase Pin1. Biomolecules 2015; 5:412-34. [PMID: 25874604 PMCID: PMC4496679 DOI: 10.3390/biom5020412] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 03/23/2015] [Accepted: 03/31/2015] [Indexed: 01/19/2023] Open
Abstract
The accumulation of 3' untranslated region (3'-UTR), AU-rich element (ARE) containing mRNAs, are predominantly controlled at the post-transcriptional level. Regulation appears to rely on a variable and dynamic interaction between mRNA target and ARE-specific binding proteins (AUBPs). The AUBP-ARE mRNA recognition is directed by multiple intracellular signals that are predominantly targeted at the AUBPs. These include (but are unlikely limited to) methylation, acetylation, phosphorylation, ubiquitination and isomerization. These regulatory events ultimately affect ARE mRNA location, abundance, translation and stability. In this review, we describe recent advances in our understanding of phosphorylation and its impact on conformation of the AUBPs, interaction with ARE mRNAs and highlight the role of Pin1 mediated prolyl cis-trans isomerization in these biological process.
Collapse
Affiliation(s)
- Zhong-Jian Shen
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75390-8548, USA.
| | - James S Malter
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75390-8548, USA.
| |
Collapse
|
23
|
Posttranscriptional adaptations of the vascular endothelium to hypoxia. Curr Opin Hematol 2015; 22:243-51. [PMID: 25767954 DOI: 10.1097/moh.0000000000000139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE OF REVIEW Remarkable new advances have been made in the field of posttranscriptional gene regulation over recent years. These include the revelation of noncoding RNAs, such as microRNAs, antisense transcripts and their interactions with RNA-binding proteins (RBPs) in the context of both health and disease settings, such as hypoxia. In particular, these discoveries bear much relevance to the field of vascular biology, which historically has focused upon transcriptional processes. Thus, the contributions of these posttranscriptional gene regulatory mechanisms to vascular and endothelial biology represent a newer concept that warrants discussion. RECENT FINDINGS Recent studies have revealed two emerging themes that are critical to endothelial/vascular biology and function. First is the functional integration between the microRNA pathway and the cellular hypoxic response, which, in addition to specific microRNAs, involves key components of the microRNA biogenesis machinery. A key concept here is the regulation of a master transcriptional programme through posttranscriptional mechanisms. The second major theme involves the dynamic interactions between RBPs, microRNAs and antisense RNAs. The condition-dependent collaborations and competitions between these different classes of posttranscriptional regulators reveal a critical layer of control for gene expression. SUMMARY Taken together, these findings bear significant diagnostic and therapeutic implications for vascular disease.
Collapse
|
24
|
Suresh Babu S, Joladarashi D, Jeyabal P, Thandavarayan RA, Krishnamurthy P. RNA-stabilizing proteins as molecular targets in cardiovascular pathologies. Trends Cardiovasc Med 2015; 25:676-83. [PMID: 25801788 DOI: 10.1016/j.tcm.2015.02.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 01/31/2015] [Accepted: 02/13/2015] [Indexed: 01/08/2023]
Abstract
The stability of mRNA has emerged as a key step in the regulation of eukaryotic gene expression and function. RNA stabilizing proteins (RSPs) contain several RNA recognition motifs, and selectively bind to adenylate-uridylate-rich elements in the 3' untranslated region of several mRNAs leading to altered processing, stability, and translation. These post-transcriptional gene regulations play a critical role in cellular homeostasis; therefore act as molecular switch between 'normal cell' and 'disease state.' Many mRNA binding proteins have been discovered to date, which either stabilize (HuR/HuA, HuB, HuC, HuD) or destabilize (AUF1, tristetraprolin, KSRP) the target transcripts. Although the function of RSPs has been widely studied in cancer biology, its role in cardiovascular pathologies is only beginning to evolve. The current review provides an overall understanding of the potential role of RSPs, specifically HuR-mediated mRNA stability in myocardial infarction, hypertension and hypertrophy. Also, the effect of RSPs on various cellular processes including inflammation, fibrosis, angiogenesis, cell-death, and proliferation and its relevance to cardiovascular pathophysiological processes is presented. We also discuss the potential clinical implications of RSPs as therapeutic targets in cardiovascular diseases.
Collapse
Affiliation(s)
- Sahana Suresh Babu
- Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, Houston, TX
| | - Darukeshwara Joladarashi
- Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, Houston, TX
| | - Prince Jeyabal
- Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, Houston, TX
| | - Rajarajan A Thandavarayan
- Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, Houston, TX
| | - Prasanna Krishnamurthy
- Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, Houston, TX.
| |
Collapse
|
25
|
Thrombin Receptor Protease-Activated Receptor 4 Is a Key Regulator of Exaggerated Intimal Thickening in Diabetes Mellitus. Circulation 2014; 130:1700-11. [DOI: 10.1161/circulationaha.113.007590] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Background—
Diabetes mellitus predisposes to thrombotic and proliferative vascular remodeling, to which thrombin contributes via activation of protease-activated receptor (PAR) 1. However, the use of PAR-1 inhibitors to suppress remodeling may be limited by severe bleeding. We recently reported upregulation of an additional thrombin receptor, PAR-4, in human vascular smooth muscle cells exposed to high glucose and have now examined PAR-4 as a novel mediator linking hyperglycemia, hypercoagulation, and vascular remodeling in diabetes mellitus.
Methods and Results—
PAR-4 expression was increased in carotid atherectomies and saphenous vein specimens from diabetic versus nondiabetic patients and in aorta and carotid arteries from streptozotocin-diabetic versus nondiabetic C57BL/6 mice. Vascular PAR-1 mRNA was not increased in diabetic mice. Ligated carotid arteries from diabetic mice developed more extensive neointimal hyperplasia and showed greater proliferation than arteries from nondiabetic mice. The augmented remodeling response was absent in diabetic mice deficient in PAR-4. At the cellular level, PAR-4 expression was controlled via the mRNA stabilizing actions of human antigen R, which accounted for the stimulatory actions of high glucose, angiotensin II, and H
2
O
2
on PAR-4 expression, whereas cicaprost via protein kinase A activation counteracted this effect.
Conclusions—
PAR-4 appears to play a hitherto unsuspected role in diabetic vasculopathy. The development of PAR-4 inhibitors might serve to limit mainly proliferative processes in restenosis-prone diabetic patients, particularly those patients in whom severe bleeding attributed to selective PAR-1 blockade or complete thrombin inhibition must be avoided or those who do not require anticoagulation.
Collapse
|
26
|
Laishram RS. Poly(A) polymerase (PAP) diversity in gene expression--star-PAP vs canonical PAP. FEBS Lett 2014; 588:2185-97. [PMID: 24873880 PMCID: PMC6309179 DOI: 10.1016/j.febslet.2014.05.029] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 05/02/2014] [Accepted: 05/15/2014] [Indexed: 01/09/2023]
Abstract
Almost all eukaryotic mRNAs acquire a poly(A) tail at the 3'-end by a concerted RNA processing event: cleavage and polyadenylation. The canonical PAP, PAPα, was considered the only nuclear PAP involved in general polyadenylation of mRNAs. A phosphoinositide-modulated nuclear PAP, Star-PAP, was then reported to regulate a select set of mRNAs in the cell. In addition, several non-canonical PAPs have been identified with diverse cellular functions. Further, canonical PAP itself exists in multiple isoforms thus illustrating the diversity of PAPs. In this review, we compare two nuclear PAPs, Star-PAP and PAPα with a general overview of PAP diversity in the cell. Emerging evidence suggests distinct niches of target pre-mRNAs for the two PAPs and that modulation of these PAPs regulates distinct cellular functions.
Collapse
Affiliation(s)
- Rakesh S Laishram
- Cancer Research Program, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram 695014, India.
| |
Collapse
|
27
|
Moore AE, Chenette DM, Larkin LC, Schneider RJ. Physiological networks and disease functions of RNA-binding protein AUF1. WILEY INTERDISCIPLINARY REVIEWS-RNA 2014; 5:549-64. [PMID: 24687816 DOI: 10.1002/wrna.1230] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 02/20/2014] [Accepted: 02/24/2014] [Indexed: 11/09/2022]
Abstract
Regulated messenger RNA (mRNA) decay is an essential mechanism that governs proper control of gene expression. In fact, many of the most physiologically potent proteins are encoded by short-lived mRNAs, many of which contain AU-rich elements (AREs) in their 3'-untranslated region (3'-UTR). AREs target mRNAs for post-transcriptional regulation, generally rapid decay, but also stabilization and translation inhibition. AREs control mRNA turnover and translation activities through association with trans-acting RNA-binding proteins that display high affinity for these AU-rich regulatory elements. AU-rich element RNA-binding protein (AUF1), also known as heterogeneous nuclear ribonucleoprotein D (HNRNPD), is an extensively studied AU-rich binding protein (AUBP). AUF1 has been shown to regulate ARE-mRNA turnover, primarily functioning to promote rapid ARE-mRNA degradation. In certain cellular contexts, AUF1 has also been shown to regulate gene expression at the translational and even the transcriptional level. AUF1 comprises a family of four related protein isoforms derived from a common pre-mRNA by differential exon splicing. AUF1 isoforms have been shown to display multiple and distinct functions that include the ability to target ARE-mRNA stability or decay, and transcriptional activation of certain genes that is controlled by their differential subcellular locations, expression levels, and post-translational modifications. AUF1 has been implicated in controlling a variety of physiological functions through its ability to regulate the expression of numerous mRNAs containing 3'-UTR AREs, thereby coordinating functionally related pathways. This review highlights the physiological functions of AUF1-mediated regulation of mRNA and gene expression, and the consequences of deficient AUF1 levels in different physiological settings.
Collapse
Affiliation(s)
- Ashleigh E Moore
- Alexandria Center for Life Sciences, New York University School of Medicine, New York, NY, USA
| | | | | | | |
Collapse
|
28
|
Hedayatizadeh-Omran A, Rafiei A, Khajavi R, Alizadeh-Navaei R, Mokhberi V, Moradzadeh K. Association between ghrelin gene (Leu72Met) polymorphism and ghrelin serum level with coronary artery diseases. DNA Cell Biol 2014; 33:95-101. [PMID: 24341728 DOI: 10.1089/dna.2013.2218] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Research shows that ghrelin gene polymorphism has some association with coronary artery diseases (CAD). Due to genetic differences among nations and the high prevalence of CAD, we conducted this study to examine the possible association between the polymorphism of ghrelin gene Leu72Met and CAD among an Iranian population. This case-control study was undertaken with patients who were referred to referral heart center, in 2011, with chest pain or a positive exercise test. Patients with risk factors for heart disease or who were surgery candidates, who underwent angiography and echocardiography, were also included. DNA extractions were performed using a modified salting out method, and the ghrelin region was amplified using polymerase chain reaction. The presence of the Leu72Met polymorphism and the serum levels of ghrelin were determined using the restriction fragment length polymorphism method and the enzyme-linked immunosorbent assay, respectively. The results indicated that in CAD patients, the incidence of heart failure was significantly different between the groups with genotypes CC or AA+CA (p=0.041). Mean serum level of ghrelin in the CAD group was significantly higher than that in the control group (p<0.0001). Additionally, there was a significant relationship between the distribution of ghrelin genotypes and serum levels of ghrelin in both the CAD and control groups (p<0.0001). This study indicates that there was a significant association between heart failure in CAD patients and the presence of the polymorphism, as well as an increase in serum levels of ghrelin associated with genotype distribution such that ghrelin levels have an inverse relationship with the frequency of the CC genotype.
Collapse
Affiliation(s)
- Akbar Hedayatizadeh-Omran
- 1 Molecular and Cell Biology Research Center, Mazandaran University of Medical Sciences , Sari, Iran
| | | | | | | | | | | |
Collapse
|
29
|
Lee KH, Kim SH, Kim HJ, Kim W, Lee HR, Jung Y, Choi JH, Hong KY, Jang SK, Kim KT. AUF1 contributes to Cryptochrome1 mRNA degradation and rhythmic translation. Nucleic Acids Res 2014; 42:3590-606. [PMID: 24423872 PMCID: PMC3973335 DOI: 10.1093/nar/gkt1379] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
In the present study, we investigated the 3' untranslated region (UTR) of the mouse core clock gene cryptochrome 1 (Cry1) at the post-transcriptional level, particularly its translational regulation. Interestingly, the 3'UTR of Cry1 mRNA decreased its mRNA levels but increased protein amounts. The 3'UTR is widely known to function as a cis-acting element of mRNA degradation. The 3'UTR also provides a binding site for microRNA and mainly suppresses translation of target mRNAs. We found that AU-rich element RNA binding protein 1 (AUF1) directly binds to the Cry1 3'UTR and regulates translation of Cry1 mRNA. AUF1 interacted with eukaryotic translation initiation factor 3 subunit B and also directly associated with ribosomal protein S3 or ribosomal protein S14, resulting in translation of Cry1 mRNA in a 3'UTR-dependent manner. Expression of cytoplasmic AUF1 and binding of AUF1 to the Cry1 3'UTR were parallel to the circadian CRY1 protein profile. Our results suggest that the 3'UTR of Cry1 is important for its rhythmic translation, and AUF1 bound to the 3'UTR facilitates interaction with the 5' end of mRNA by interacting with translation initiation factors and recruiting the 40S ribosomal subunit to initiate translation of Cry1 mRNA.
Collapse
Affiliation(s)
- Kyung-Ha Lee
- Department of Life Sciences, Pohang University of Science and Technology, San 31 Hyoja-dong, Pohang, Gyeongbuk 790-784, Republic of Korea, School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, San 31 Hyoja-dong, Pohang, Gyeongbuk 790-784, Republic of Korea and Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, San 31 Hyoja-dong, Pohang, Gyeongbuk 790-784, Republic of Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Nguyen TT, Seoighe C. Integrative analysis of mRNA expression and half-life data reveals trans-acting genetic variants associated with increased expression of stable transcripts. PLoS One 2013; 8:e79627. [PMID: 24260269 PMCID: PMC3832542 DOI: 10.1371/journal.pone.0079627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/03/2013] [Indexed: 11/19/2022] Open
Abstract
Genetic variation in gene expression makes an important contribution to phenotypic variation and susceptibility to disease. Recently, a subset of cis-acting expression quantitative loci (eQTLs) has been found to result from polymorphisms that affect RNA stability. Here we carried out a search for trans-acting variants that influence RNA stability. We first demonstrate that differences in the activity of trans-acting factors that stabilize RNA can be detected by comparing the expression levels of long-lived (stable) and short-lived (unstable) transcripts in high-throughput gene expression experiments. Using gene expression microarray data generated from eight HapMap3 populations, we calculated the relative expression ranks of long-lived transcripts versus short-lived transcripts in each sample. Treating this as a quantitative trait, we applied genome-wide association and identified a single nucleotide polymorphism (SNP), rs6137010, on chromosome 20p13 with which it is strongly associated in two Asian populations (p = 4×10−10 in CHB – Han Chinese from Beijing; p = 1×10−4 in JPT – Japanese from Tokyo). This SNP is a cis-eQTL for SNRPB in CHB and JPT but not in the other six HapMap3 populations. SNRPB is a core component of the spliceosome, and has previously been shown to affect the expression of many RNA processing factors. We propose that a cis-eQTL of SNRPB may be directly responsible for inter-individual variation in relative expression of long-lived versus short-lived transcript in Asian populations. In support of this hypothesis, knockdown of SNRPB results in a significant reduction in the relative expression of long-lived versus short-lived transcripts. Samples with higher relative expression of long-lived transcripts also had higher relative expression of coding compared to non-coding RNA and of RNA from housekeeping compared to non-housekeeping genes, due to the lower decay rates of coding RNAs, particularly those that perform housekeeping functions, compared to non-coding RNAs.
Collapse
Affiliation(s)
- Thong T. Nguyen
- School of Mathematics, Statistics & Applied Mathematics, National University of Ireland, Galway, Ireland
| | - Cathal Seoighe
- School of Mathematics, Statistics & Applied Mathematics, National University of Ireland, Galway, Ireland
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Anzio Road, Observatory, Cape Town, South Africa
- * E-mail:
| |
Collapse
|
31
|
Ni T, Yang Y, Hafez D, Yang W, Kiesewetter K, Wakabayashi Y, Ohler U, Peng W, Zhu J. Distinct polyadenylation landscapes of diverse human tissues revealed by a modified PA-seq strategy. BMC Genomics 2013; 14:615. [PMID: 24025092 PMCID: PMC3848854 DOI: 10.1186/1471-2164-14-615] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 09/10/2013] [Indexed: 11/10/2022] Open
Abstract
Background Polyadenylation is a key regulatory step in eukaryotic gene expression and one of the major contributors of transcriptome diversity. Aberrant polyadenylation often associates with expression defects and leads to human diseases. Results To better understand global polyadenylation regulation, we have developed a polyadenylation sequencing (PA-seq) approach. By profiling polyadenylation events in 13 human tissues, we found that alternative cleavage and polyadenylation (APA) is prevalent in both protein-coding and noncoding genes. In addition, APA usage, similar to gene expression profiling, exhibits tissue-specific signatures and is sufficient for determining tissue origin. A 3′ untranslated region shortening index (USI) was further developed for genes with tandem APA sites. Strikingly, the results showed that different tissues exhibit distinct patterns of shortening and/or lengthening of 3′ untranslated regions, suggesting the intimate involvement of APA in establishing tissue or cell identity. Conclusions This study provides a comprehensive resource to uncover regulated polyadenylation events in human tissues and to characterize the underlying regulatory mechanism.
Collapse
Affiliation(s)
- Ting Ni
- National Heart Lung Blood Institute, National Institutes of Health, Genetics and Development Biology Center, 9000 Rockville Pike, Bethesda, MD, 20892, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Blech-Hermoni Y, Ladd AN. RNA binding proteins in the regulation of heart development. Int J Biochem Cell Biol 2013; 45:2467-78. [PMID: 23973289 DOI: 10.1016/j.biocel.2013.08.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 08/09/2013] [Accepted: 08/13/2013] [Indexed: 11/28/2022]
Abstract
In vivo, RNA molecules are constantly accompanied by RNA binding proteins (RBPs), which are intimately involved in every step of RNA biology, including transcription, editing, splicing, transport and localization, stability, and translation. RBPs therefore have opportunities to shape gene expression at multiple levels. This capacity is particularly important during development, when dynamic chemical and physical changes give rise to complex organs and tissues. This review discusses RBPs in the context of heart development. Since the targets and functions of most RBPs--in the heart and at large--are not fully understood, this review focuses on the expression and roles of RBPs that have been implicated in specific stages of heart development or developmental pathology. RBPs are involved in nearly every stage of cardiogenesis, including the formation, morphogenesis, and maturation of the heart. A fuller understanding of the roles and substrates of these proteins could ultimately provide attractive targets for the design of therapies for congenital heart defects, cardiovascular disease, or cardiac tissue repair.
Collapse
Affiliation(s)
- Yotam Blech-Hermoni
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Program in Cell Biology, Department of Molecular Biology and Microbiology, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | | |
Collapse
|
33
|
Matteucci E, Maroni P, Bendinelli P, Locatelli A, Desiderio MA. Epigenetic control of endothelin-1 axis affects invasiveness of breast carcinoma cells with bone tropism. Exp Cell Res 2013; 319:1865-1874. [PMID: 23660387 DOI: 10.1016/j.yexcr.2013.04.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 04/15/2013] [Accepted: 04/25/2013] [Indexed: 01/07/2023]
Abstract
Here, we report a complex regulation of endothelin-1 (ET-1) axis driven by epigenetic reactions in 1833-bone metastatic cells, emphasizing the importance in skeletal metastasis from breast carcinoma. Inhibitors of histone deacetylases, trichostatin A (TSA), and of DNA methylases, 5'-Azacytidine (Aza), caused, respectively, reduction and increase in 1833 cell invasiveness, without affecting the basal migration of parental MDA-MB231 cells. Of note, in the two cell lines exposed to Aza the blockade of the ET-1 receptor ETAR with BQ-123 oppositely changed invasive properties. Even if in MDA-MB231 cells the ET-1 axis was scarcely influenced by epigenetic reactions, ETAR remarkably decreased after Aza. In contrast, in 1833 cells Aza exposure enhanced ET-1 coupled to ETAR wild type, being also ETAR truncated form increased, and invasiveness was stimulated. Under demethylation, the increase in ET-1 steady state protein level in 1833 clone seemed regulated at transcriptional level principally via Ets1 transcription factor. In fact, actinomycin D almost completely prevented ET-1 mRNA induction due to Aza. Only in 1833 cells, TSA exposure inactivated ET-1 axis, with reduction of the expression of ET-1 and ETAR mutated form, in agreement with Matrigel invasion decrease. This treatment favoured the ET-1 repressional control, taking place at the level of mRNA stability due to the 3'-untranslated region in the ET-1 gene, and also decreased transcription via NF-kB. Environmental conditions that alter the balance between epigenetic reactions might, therefore, affect metastasis migratory mode influencing ET-1 axis.
Collapse
Affiliation(s)
- Emanuela Matteucci
- Dipartimento di Scienze Biomediche per la Salute, Molecular Pathology Laboratory, Università degli Studi di Milano, via Luigi Mangiagalli, 31, 20133 Milano, Italy
| | - Paola Maroni
- Istituto Ortopedico Galeazzi, IRCCS, Milano, Italy
| | - Paola Bendinelli
- Dipartimento di Scienze Biomediche per la Salute, Molecular Pathology Laboratory, Università degli Studi di Milano, via Luigi Mangiagalli, 31, 20133 Milano, Italy
| | - Alessia Locatelli
- Dipartimento di Scienze Biomediche per la Salute, Molecular Pathology Laboratory, Università degli Studi di Milano, via Luigi Mangiagalli, 31, 20133 Milano, Italy; Istituto FIRC di Oncologia Molecolare, Milano, Italy
| | - Maria Alfonsina Desiderio
- Dipartimento di Scienze Biomediche per la Salute, Molecular Pathology Laboratory, Università degli Studi di Milano, via Luigi Mangiagalli, 31, 20133 Milano, Italy.
| |
Collapse
|
34
|
Bedulina DS, Evgen'ev MB, Timofeyev MA, Protopopova MV, Garbuz DG, Pavlichenko VV, Luckenbach T, Shatilina ZM, Axenov-Gribanov DV, Gurkov AN, Sokolova IM, Zatsepina OG. Expression patterns and organization of thehsp70genes correlate with thermotolerance in two congener endemic amphipod species (Eulimnogammarus cyaneusandE. verrucosus) from Lake Baikal. Mol Ecol 2013; 22:1416-30. [DOI: 10.1111/mec.12136] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Revised: 10/09/2012] [Accepted: 10/10/2012] [Indexed: 12/14/2022]
Affiliation(s)
- D. S. Bedulina
- Irkutsk State University; Karl-Marx str. 1 Irkutsk 664003 Russia
- Baikal Research Centre; Lenina str. 3 Irkutsk 664003 Russia
| | - M. B. Evgen'ev
- Engelhardt Institute of Molecular Biology; Russian Academy of Sciences; Vaviolva str. 32 Moscow 119991 Russia
- Institute of Cell Biophysics; Russian Academy of Sciences; Institutskaya str. 3 Pushchino 142290 Russia
| | - M. A. Timofeyev
- Irkutsk State University; Karl-Marx str. 1 Irkutsk 664003 Russia
- Baikal Research Centre; Lenina str. 3 Irkutsk 664003 Russia
| | - M. V. Protopopova
- Irkutsk State University; Karl-Marx str. 1 Irkutsk 664003 Russia
- Siberian Institute of Plant Physiology and Biochemistry; Siberian Branch Russian Academy of Sciences; Lermontov str. 132 Irkutsk 664033 Russia
| | - D. G. Garbuz
- Engelhardt Institute of Molecular Biology; Russian Academy of Sciences; Vaviolva str. 32 Moscow 119991 Russia
| | - V. V. Pavlichenko
- Irkutsk State University; Karl-Marx str. 1 Irkutsk 664003 Russia
- Siberian Institute of Plant Physiology and Biochemistry; Siberian Branch Russian Academy of Sciences; Lermontov str. 132 Irkutsk 664033 Russia
| | - T. Luckenbach
- UFZ Helmholtz Centre for Environmental Research; Department of Bioanalytical Ecotoxicology; Permoserstr.15 Leipzig 04318 Germany
| | - Z. M. Shatilina
- Irkutsk State University; Karl-Marx str. 1 Irkutsk 664003 Russia
- Baikal Research Centre; Lenina str. 3 Irkutsk 664003 Russia
| | - D. V. Axenov-Gribanov
- Irkutsk State University; Karl-Marx str. 1 Irkutsk 664003 Russia
- Baikal Research Centre; Lenina str. 3 Irkutsk 664003 Russia
| | - A. N. Gurkov
- Irkutsk State University; Karl-Marx str. 1 Irkutsk 664003 Russia
- Baikal Research Centre; Lenina str. 3 Irkutsk 664003 Russia
| | - I. M. Sokolova
- Department of Biology; University of North Carolina at Charlotte; 9201 University City Blvd. Charlotte NC 28223 USA
| | - O. G. Zatsepina
- Engelhardt Institute of Molecular Biology; Russian Academy of Sciences; Vaviolva str. 32 Moscow 119991 Russia
| |
Collapse
|
35
|
Metzger IF, Luizon MR, Lacchini R, Ishizawa MH, Tanus-Santos JE. Effects of endothelial nitric oxide synthase tagSNPs haplotypes on nitrite levels in black subjects. Nitric Oxide 2013; 28:33-8. [DOI: 10.1016/j.niox.2012.10.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Revised: 10/04/2012] [Accepted: 10/05/2012] [Indexed: 11/16/2022]
|
36
|
Jung J, Lifland AW, Zurla C, Alonas EJ, Santangelo PJ. Quantifying RNA-protein interactions in situ using modified-MTRIPs and proximity ligation. Nucleic Acids Res 2012; 41:e12. [PMID: 22952158 PMCID: PMC3592441 DOI: 10.1093/nar/gks837] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The stabilization, translation and degradation of RNA are regulated by interactions between trans-acting factors, such as microRNA and RNA-binding proteins (RBP). In order to investigate the relationships between these events and their significance, a method that detects the localization of these interactions within a single cell, as well as their variability across a cell population, is needed. To visualize and quantify RNA–protein interactions in situ, we developed a proximity ligation assay (PLA) that combined peptide-modified, multiply-labelled tetravalent RNA imaging probes (MTRIPs), targeted to sequences near RBP binding sites, with proximity ligation and rolling circle amplification (RCA). Using this method, we detected and quantified, with single-interaction sensitivity, the localization and frequency of interactions of the human respiratory syncytial virus (hRSV) nucleocapsid protein (N) with viral genomic RNA (gRNA). We also described the effects of actinomycin D (actD) on the interactions of HuR with β-actin mRNA and with poly(A)+ mRNA at both native and increased HuR expression levels.
Collapse
Affiliation(s)
- Jeenah Jung
- Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 313 Ferst Drive, UA Whitaker Bldg, Atlanta, GA 30332, USA
| | | | | | | | | |
Collapse
|
37
|
D'souza D, Lai RYJ, Shuen M, Hood DA. mRNA stability as a function of striated muscle oxidative capacity. Am J Physiol Regul Integr Comp Physiol 2012; 303:R408-17. [DOI: 10.1152/ajpregu.00085.2012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A change in mRNA stability alters the abundance of mRNA available for translation and is emerging as a critical pathway influencing gene expression. Variations in the stability of functional and regulatory mitochondrial proteins may contribute to the divergent mitochondrial densities observed in striated muscle. Thus we hypothesized that the stability of mRNAs encoding for regulatory nuclear and mitochondrial transcription factors would be inversely proportional to muscle oxidative capacity and would be facilitated by the activity of RNA binding proteins (RBPs). The stability of mitochondrial transcription factor A (Tfam), peroxisome proliferator-activated receptor gamma coactivator 1α (PGC-1α), and nuclear respiratory factor 2α (NRF-2α) mRNA was assessed in striated muscles with distinct oxidative capacities using in vitro decay assays. All three mitochondrial regulators were rapidly degraded in cardiac and slow-twitch red (STR) muscle, resulting in a ∼60–65% lower ( P < 0.05) mRNA half-life ( t1/2) compared with fast-twitch white (FTW) fibers. This accelerated rate of Tfam mRNA decay was matched by a 2.5-fold increase in Tfam transcription in slow- compared with fast-twitch muscle ( P = 0.05). Protein expression of four unique RBPs [AU-rich binding factor 1 (AUF1), human antigen R (HuR), KH-homology splicing regulatory protein (KSRP), and CUG binding protein 1 (CUGBP1)] believed to modulate mRNA stability was elevated in cardiac and STR muscles ( P < 0.05) and was moderately associated with the decay of Tfam, PGC-1α, and NRF-2α mRNA. Variable rates of transcript degradation were apparent when comparing all transcripts within the same muscle type. Thus the distribution of RBPs appears to follow a fiber-type specific pattern and subsequently functions to alter the stability of specific mitochondrial regulators in a transcript- and tissue-specific fashion.
Collapse
Affiliation(s)
- Donna D'souza
- School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada; and Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Ruanne Y. J. Lai
- School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada; and Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Michael Shuen
- School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada; and Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - David A. Hood
- School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada; and Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| |
Collapse
|
38
|
Iwaki S, Yamamura S, Asai M, Sobel BE, Fujii S. Posttranscriptional regulation of expression of plasminogen activator inhibitor type-1 by sphingosine 1-phosphate in HepG2 liver cells. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2012; 1819:1132-41. [PMID: 22819712 DOI: 10.1016/j.bbagrm.2012.07.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 07/02/2012] [Accepted: 07/11/2012] [Indexed: 11/26/2022]
Abstract
Altered expression of plasminogen activator inhibitor type-1 (PAI-1), a major physiologic inhibitor of fibrinolysis, is implicated in the progression of atherosclerosis. Sphingosine 1-phosphate (S1P) regulates expression of diverse genes and alters expression of PAI-1 in several types of cells. However, the nature of posttranscriptional regulation of expression of PAI-1 by S1P has not yet been thoroughly elucidated. The present study was undertaken to determine whether S1P has important effects on the posttranscriptional regulation of PAI-1 expression. To evaluate this possibility, we determined promoter activity, mRNA levels, 3'-untranslated region (UTR) activity, and protein levels of PAI-1 in HepG2 cells. S1P increased PAI-1 promoter activity and the expression of PAI-1 mRNA within 4h of exposure. It decreased the expression of PAI-1 mRNA and the accumulation of PAI-1 protein into the media in 24h. Human PAI-1 mRNA exists in two subspecies (3.2 and 2.2kb). S1P decreased the baseline luciferase activity of the 1kb fragment of the 3' terminus (+2177 to 3176nt) of the 3'-UTR of the 3.2kb PAI-1 mRNA [3'-UTR (+2177-3176)]. S1P decreased expression of PAI-1 protein, presumably by regulating PAI-1 expression at the posttranscriptional level thereby affecting mRNA stability. SERPINE1 mRNA binding protein (SERBP1) and ARE3 in the 3'-UTR were involved in the posttranscriptional regulation by S1P. Our data suggest that S1P can destabilize 3.2kb PAI-1 mRNA through specific effects on the 3'-UTR. These effects appear to involve SERBP1 leading to decreased expression of PAI-1 protein.
Collapse
Affiliation(s)
- Soichiro Iwaki
- Department of Molecular and Cellular Pathobiology and Therapeutics, Nagoya City University, Nagoya, Japan
| | | | | | | | | |
Collapse
|
39
|
AKHTER QULSUM, MASOOD AKBAR, ASHRAF RUHI, MAJID SABIA, RASOOL SABAH, KHAN TANZEELA, RASHID TABASUM, SAMEER ASYED, GANAI BASHIRAHMAD. Polymorphisms in the 3'UTR of the human leptin gene and their role in hypertension. Mol Med Rep 2012; 5:1058-62. [PMID: 22218754 PMCID: PMC3493089 DOI: 10.3892/mmr.2012.743] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2011] [Accepted: 12/12/2011] [Indexed: 02/04/2023] Open
Abstract
Leptin is a protein hormone, mainly synthesized in adipocytes, that regulates the food intake and energy expenditure of the body. Rare mutations in the leptin gene cause obesity. Common polymorphisms of the leptin gene have been associated with obesity, however their association with arterial blood pressure has not been fully elucidated. The aim of the present study was to examine the effect of variants in the 3' flanking region of the leptin gene on blood pressure in hypertensive subjects with high (35.2 ± 5.12) and low (20.13 ± 1.3) body mass index (BMI). Microsatellite polymorphisms and the C538T SNP in the 3'UTR of the leptin gene were screened in 362 subjects, and different biochemical and anthropometric parameters were measured. The levels of serum urea, creatinine, glucose, cholesterol, triglyceride, leptin and angiotensin II were determined in all subjects. A strong association of microsatellite polymorphisms with essential hypertension was found in subjects with a high BMI, but this association was only slight in subjects with a normal BMI. The C538T variant was not found in this population. The frequency of the Class I/Class I and Class I/Class II genotype for tetranucleotide polymorphisms was also significantly higher in the hypertensive compared to the normotensive group (p ≤ 0.0001). In addition, a significant correlation was found between serum leptin and Class I/I and Class I/II genotypes. Linear regression analysis showed an independent correlation of leptinemia with BMI (p=0.019), while a notable correlation was found between serum leptin concentration and angiotensin II. The study confirmed that shorter alleles of microsatellites in the 3' flanking region of leptin are significantly associated with hypertension, however, the underlying mechanism remains unknown.
Collapse
Affiliation(s)
- QULSUM AKHTER
- Department of Biochemistry, University of Kashmir, Hazratbal
| | - AKBAR MASOOD
- Department of Biochemistry, University of Kashmir, Hazratbal
| | - RUHI ASHRAF
- Department of Biochemistry, Government Medical College, Kaksarai
| | - SABIA MAJID
- Department of Biochemistry, Government Medical College, Kaksarai
| | - SABAH RASOOL
- Department of Biochemistry, University of Kashmir, Hazratbal
| | - TANZEELA KHAN
- Department of Biochemistry, University of Kashmir, Hazratbal
| | - TABASUM RASHID
- Department of Biochemistry, Government Medical College, Kaksarai
| | - A. SYED SAMEER
- Department of Immunology and Molecular Medicine, SKIMS, Soura, Srinagar, Jammu and Kashmir, India
| | | |
Collapse
|
40
|
Heme oxygenase-1 induction and organic nitrate therapy: beneficial effects on endothelial dysfunction, nitrate tolerance, and vascular oxidative stress. Int J Hypertens 2012; 2012:842632. [PMID: 22506100 PMCID: PMC3312327 DOI: 10.1155/2012/842632] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Accepted: 11/21/2011] [Indexed: 12/21/2022] Open
Abstract
Organic nitrates are a group of very effective anti-ischemic drugs. They are used for the treatment of patients with stable angina, acute myocardial infarction, and chronic congestive heart failure. A major therapeutic limitation inherent to organic nitrates is the development of tolerance, which occurs during chronic treatment with these agents, and this phenomenon is largely based on induction of oxidative stress with subsequent endothelial dysfunction. We therefore speculated that induction of heme oxygenase-1 (HO-1) could be an efficient strategy to overcome nitrate tolerance and the associated side effects. Indeed, we found that hemin cotreatment prevented the development of nitrate tolerance and vascular oxidative stress in response to chronic nitroglycerin therapy. Vice versa, pentaerithrityl tetranitrate (PETN), a nitrate that was previously reported to be devoid of adverse side effects, displayed tolerance and oxidative stress when the HO-1 pathway was blocked pharmacologically or genetically by using HO-1+/– mice. Recently, we identified activation of Nrf2 and HuR as a principle mechanism of HO-1 induction by PETN. With the present paper, we present and discuss our recent and previous findings on the role of HO-1 for the prevention of nitroglycerin-induced nitrate tolerance and for the beneficial effects of PETN therapy.
Collapse
|
41
|
Raoch V, Rodríguez-Pascual F, López-Martínez V, Medrano-Andrés D, Rodríguez-Puyol M, Lamas S, Rodríguez-Puyol D, López-Ongil S. Nitric oxide decreases the expression of endothelin-converting enzyme-1 through mRNA destabilization. Arterioscler Thromb Vasc Biol 2012; 31:2577-85. [PMID: 21852564 DOI: 10.1161/atvbaha.111.232025] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVE Endothelial function depends on the equilibrium in the synthesis of vasoactive endothelial factors. It is well known that endothelin and nitric oxide (NO) exhibit reciprocal regulation. We assessed the ability of NO to regulate endothelin-converting enzyme-1 (ECE-1) expression in vascular endothelial cells. METHODS AND RESULTS Bovine aortic endothelial cells were incubated with 2 different NO donors as well as with a cyclic-GMP analog, dibutyryl-cGMP (dB-cGMP). ECE-1 protein content and mRNA expression were evaluated by Western blot and Northern blot, respectively, promoter activity by transfection experiments, ECE-1 activity by ELISA, and cGMP production by radioimmunoassay. Both NO donors decreased ECE-1 protein content, mRNA expression, and ECE-1 activity. ODQ, an inhibitor of soluble guanylyl cyclase, blocked those effects. NO donors raised cGMP levels, and dB-cGMP mimicked their effects on ECE-1 expression, which were blocked by KT5823, a nonspecific PKG inhibitor. The changes on ECE-1 expression were due to a destabilization on 3'-untranslated region (3'-UTR) of this mRNA, because the activity of a luciferase reporter construct containing the 3'-UTR of the ECE-1 gene was reduced by dB-cGMP in a PKG-dependent manner. The biological relevance of this regulation was confirmed in bovine aortic endothelial cells coincubated with macrophages in the presence of lipopolysaccharide, in eNOS-deficient mice, and in Wistar rats treated with NO donors. In every case, an inverse relationship was observed between NO and ECE-1 protein content. CONCLUSION Our results support that NO regulates ECE-1 expression through a cGMP/PKG-dependent regulatory mechanism at the post-transcriptional level via the 3'-UTR of the ECE-1 gene.
Collapse
Affiliation(s)
- Viviana Raoch
- Research Unit and Nephrology Section, Hospital Universitario Príncipe de Asturias, Alcalá de Henares, Spain
| | | | | | | | | | | | | | | |
Collapse
|
42
|
Abstract
The cytoplasmic events that control mammalian gene expression, primarily mRNA stability and translation, potently influence the cellular response to internal and external signals. The ubiquitous RNA-binding protein (RBP) HuR is one of the best-studied regulators of cytoplasmic mRNA fate. Through its post-transcriptional influence on specific target mRNAs, HuR can alter the cellular response to proliferative, stress, apoptotic, differentiation, senescence, inflammatory and immune stimuli. In light of its central role in important cellular functions, HuR's role in diseases in which these responses are aberrant is increasingly appreciated. Here, we review the mechanisms that control HuR function, its influence on target mRNAs, and how impairment in HuR-governed gene expression programs impact upon different disease processes. We focus on HuR's well-recognized implication in cancer and chronic inflammation, and discuss emerging studies linking HuR to cardiovascular, neurological, and muscular pathologies. We also discuss the progress, potential, and challenges of targeting HuR therapeutically.
Collapse
Affiliation(s)
- Subramanya Srikantan
- Laboratory of Molecular Biology and Immunology, NIA-IRP, NIH, Baltimore, MD 21224, USA
| | | |
Collapse
|
43
|
Jobi K, Rauch BH, Dangwal S, Freidel K, Doller A, Eberhardt W, Fischer JW, Schrör K, Rosenkranz AC. Redox regulation of human protease-activated receptor-2 by activated factor X. Free Radic Biol Med 2011; 51:1758-64. [PMID: 21871560 DOI: 10.1016/j.freeradbiomed.2011.08.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Revised: 07/12/2011] [Accepted: 08/05/2011] [Indexed: 11/16/2022]
Abstract
Activated factor X (FXa) exerts coagulation-independent actions such as proliferation of vascular smooth muscle cells (SMCs) through the protease-activated receptors PAR-1 and PAR-2. Both receptors are upregulated upon vascular injury but the underlying mechanisms have not been defined. We examined if FXa regulates PAR-1 and PAR-2 in human vascular SMCs. FXa increased PAR-2 mRNA, protein, and cell-surface expression and augmented PAR-2-mediated mitogenesis. PAR-1 was not influenced. The regulatory action of FXa on PAR-2 was concentration-dependent and mimicked by a PAR-2-selective activating peptide. PAR-2 regulation was not influenced by the thrombin inhibitor argatroban or PAR-1 siRNA. FXa increased dichlorofluorescein diacetate fluorescence and 8-isoprostane formation and induced expression of the NADPH oxidase subunit NOX-1. NOX-1 siRNA prevented FXa-stimulated PAR-2 regulation, as did ebselen and cell-permeative and impermeative forms of catalase. Exogenous H(2)O(2) increased PAR-2 expression and mitogenic activity. FXa promoted nuclear translocation and PAR-2/DNA binding of nuclear factor κB (NF-κB); NF-κB inhibition prevented PAR-2 regulation by FXa. FXa also promoted PAR-2 mRNA stabilization through increased human antigen R (HuR)/PAR-2 mRNA binding and cytoplasmic shuttling. HuR siRNA abolished FXa-stimulated PAR-2 expression. Thus FXa induces functional expression of PAR-2 but not of PAR-1 in human SMCs, independent of thrombin formation, via a mechanism involving NOX-1-containing NADPH oxidase, H(2)O(2), NF-κB, and HuR.
Collapse
Affiliation(s)
- Klaus Jobi
- Institut für Pharmakologie und Klinische Pharmakologie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Asakura T, Iwaki S, Okada H, Sobel BE, Fujii S. Posttranscriptional regulation of expression of plasminogen activator inhibitor type-1 by cAMP in HepG2 liver cells. J Biochem 2011; 150:687-94. [PMID: 21878476 DOI: 10.1093/jb/mvr110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Altered expression of plasminogen activator inhibitor type-1 (PAI-1), a physiologic fibrinolysis inhibitor, is implicated in atherosclerosis. Cyclic adenosine monophosphate (cAMP) alters PAI-1 expression in several cells. Nevertheless, posttranscriptional regulation of PAI-1 has not been elucidated. To determine whether cAMP affects PAI-1 expression at posttranscriptional level, we determined promoter activity, mRNA levels, 3'-untranslated region (UTR) activity and protein levels of PAI-1 using HepG2 cells. cAMP decreased PAI-1 promoter activity at 24 h and mRNA expression at 4 h while it increased mRNA expression and accumulation of PAI-1 protein into media at 24 h. Human PAI-1 mRNA exists in two subspecies (3.2 and 2.2 kb), and cAMP increased baseline luciferase activity of 3'-UTR of the 3.2 kb PAI-1 mRNA [3'-UTR (+1358-3176)] and 1 kb fragment of 3'-terminus of 3'-UTR of 3.2 kb mRNA [3'-UTR (+2177-3176)]. cAMP increased PAI-1 protein expression despite decrease in promoter activity, presumably by regulating PAI-1 expression at the posttranscriptional level and thereby affecting mRNA stability. The 53-nt fragment in 3'-UTR (+2591 to +2643 nt) was involved in posttranscriptional regulation by cAMP. Thus, cAMP can stabilize 3.2 kb PAI-1 mRNA mediated by specific effects on 3'-UTR, and these effects are associated with increased expression of PAI-1 protein.
Collapse
Affiliation(s)
- Takefumi Asakura
- Department of Molecular and Cellular Pathobiology and Therapeutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
| | | | | | | | | |
Collapse
|
45
|
Rosenkranz AC, Rauch BH, Doller A, Eberhardt W, Böhm A, Bretschneider E, Schrör K. Regulation of human vascular protease-activated receptor-3 through mRNA stabilization and the transcription factor nuclear factor of activated T cells (NFAT). Mol Pharmacol 2011; 80:337-44. [PMID: 21596928 DOI: 10.1124/mol.111.072850] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Thrombin promotes vascular smooth muscle cell (SMC) proliferation and inflammation via protease-activated receptor (PAR)-1. A further thrombin receptor, PAR-3, acts as a PAR-1 cofactor in some cell-types. Unlike PAR-1, PAR-3 is dynamically regulated at the mRNA level in thrombin-stimulated SMC. This study investigated the mechanisms controlling PAR-3 expression. In human vascular SMC, PAR-3 siRNA attenuated thrombin-stimulated interleukin-6 expression and extracellular signal-regulated kinases 1/2 phosphorylation, indicating PAR-3 contributes to net thrombin responses in these cells. Thrombin slowed the decay of PAR-3 but not PAR-1 mRNA in the presence of actinomycin D and induced cytosolic shuttling and PAR-3 mRNA binding of the mRNA-stabilizing protein human antigen R (HuR). HuR siRNA prevented thrombin-induced PAR-3 expression. By contrast, forskolin inhibited HuR shuttling and destabilized PAR-3 mRNA, thus reducing PAR-3 mRNA and protein expression. Other cAMP-elevating agents, including the prostacyclin-mimetic iloprost, also down-regulated PAR-3, accompanied by decreased HuR/PAR-3 mRNA binding. Iloprost-induced suppression of PAR-3 was reversed with a myristoylated inhibitor of protein kinase A and mimicked by phorbol ester, an inducer of cyclooxygenase-2. In separate studies, iloprost attenuated PAR-3 promoter activity and prevented binding of nuclear factor of activated T cells (NFAT2) to the human PAR-3 promoter in a chromatin immunoprecipitation assay. Accordingly, PAR-3 expression was suppressed by the NFAT inhibitor cyclosporine A or NFAT2 siRNA. Thus human PAR-3, unlike PAR-1, is regulated post-transcriptionally via the mRNA-stabilizing factor HuR, whereas transcriptional control involves NFAT2. Through modulation of PAR-3 expression, prostacyclin and NFAT inhibitors may limit proliferative and inflammatory responses to thrombin after vessel injury.
Collapse
Affiliation(s)
- Anke C Rosenkranz
- Institut für Pharmakologie und Klinische Pharmakologie, Klinikum der Heinrich-Heine-Universität Düsseldorf, Moorenstraße 5, 40225 Düsseldorf, Germany.
| | | | | | | | | | | | | |
Collapse
|
46
|
Zhang Q, Huang WD, Lv XY, Yang YM. The association of ghrelin polymorphisms with coronary artery disease and ischemic chronic heart failure in an elderly Chinese population. Clin Biochem 2010; 44:386-90. [PMID: 21195705 DOI: 10.1016/j.clinbiochem.2010.12.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2010] [Revised: 11/30/2010] [Accepted: 12/19/2010] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To investigate the association of coronary artery disease (CAD) and ischemic heart failure (IHF) with polymorphisms of the ghrelin gene in elderly Chinese patients. DESIGN AND METHODS Fifty-six patients with ischemic heart failure, sixty patients with coronary artery disease without heart failure, and one hundred healthy control subjects participated in the study. The polymorphisms were evaluated by polymerase chain reaction, sequencing, and fragment length polymorphism analysis. RESULTS Only one single nucleotide polymorphism (SNP), Leu72Met (408C/A), was observed across all samples. Gene frequencies of CC and allele frequencies of C were significantly greater in the CAD with IHF group than those in the CAD without IHF group (p=0.025, p=0.011). There was no significant association between the Leu72Met SNP with coronary artery disease risk factors. CONCLUSION Our results suggest that a C allele at position 408 of the ghrelin gene is associated with genetic susceptibility to ischemic heart failure in Chinese elders.
Collapse
Affiliation(s)
- Qin Zhang
- Department of Geriatrics, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, PR China
| | | | | | | |
Collapse
|
47
|
Increased expression of plasminogen activator inhibitor type-1 (PAI-1) in HEPG2 cells induced by insulin mediated by the 3'-untranslated region of the PAI-1 gene and its pharmacologic implications. Coron Artery Dis 2010; 21:144-50. [PMID: 20299979 DOI: 10.1097/mca.0b013e328335790e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Insulin increases, through several molecular mechanisms, expression of plasminogen activator inhibitor-1 (PAI-1), the major physiologic inhibitor of fibrinolysis. This phenomenon has been implicated as a cause of accelerated coronary artery disease and the increased incidence of acute coronary syndromes associated with type 2 diabetes. We have previously reported that physiologic and pharmacologic concentrations of insulin induce PAI-1 synthesis in human HepG2 cells and that simvastatin can attenuate its effects. This study was performed to further elucidate mechanisms responsible for the insulin-induced PAI-1 production. METHODS Concentrations of PAI-1 mRNA were determined by real-time PCR, and PAI-1 protein was assayed by western blotting. PAI-1 promoter (-829 to +36 bp) activity was assayed with the use of luciferase reporter assays. The potential role of the 3'-untranslated region (UTR) in the PAI-1 gene was assayed with the use of luciferase constructs containing the 3'-UTR. Oxidative stress was measured by loading cells with carboxy-2,7 dichlorodihydrofluorescein. RESULTS Insulin increased PAI-1 promoter activity, PAI-1 mRNA, and accumulation of PAI-1 protein in the conditioned media. Insulin-inducible PAI-1 promoter activity was attenuated by simvastatin. Experiments performed with luciferase reporters containing the 3'-UTR showed that insulin increased luciferase activity through this region. Insulin also increased oxidative stress. Both insulin-inducible luciferase activity through the 3'-UTR and oxidative stress were attenuated by simvastatin. CONCLUSION Insulin can increase PAI-1 expression through multiple mechanisms including induction mediated by the 3'-UTR of the PAI-1 gene. Accordingly, beneficial pleiotropic effects of statins on coronary artery disease may be attributable, in part, to attenuation of overexpression of PAI-1 mediated by the 3'-UTR in syndromes of insulin resistance (such as the metabolic syndrome) and type 2 diabetes.
Collapse
|
48
|
Misquitta C, Ghosh P, Mwanjewe J, Grover A. Role of cis-acting elements in the control of SERCA2b Ca2+ pump mRNA decay by nuclear proteins. Biochem J 2009; 388:291-7. [PMID: 15656788 PMCID: PMC1186718 DOI: 10.1042/bj20041568] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Alternative splicing at position 3495 b yields SERCA2 (sarco/endoplasmic reticulum Ca2+ pump 2) RNA species, namely SERCA2a and SERCA2b which differ in 3'-end regions. This results in SERCA2b RNA being less stable. In vitro decay experiments show that, in the presence of protein extracts from nuclei of LVMs (left ventricular myocytes), the rate of decay of both SERCA2b RNA and synthetic RNA from its 3'-region is greater than that of the corresponding SERCA2a RNA. To search for cis-acting instability elements in the 3'-region of SERCA2b, we examined the effects of LVM nuclear protein extracts on the in vitro decay of six short overlapping capped [m7G(5')ppp(5')Gm] and polyadenylated (A40) RNA fragments from the 3'-end region (3444-4472) of SERCA2b. The proximal fragment 2B1 (3444-3753) was the most unstable. 2B1 RNA without a cap or a polyadenylated tail was analysed further in electrophoretic mobility-shift assays, and was observed to bind to protein(s) in the nuclear extracts. Based on competition for binding to nuclear proteins between radiolabelled 2B1 RNA and short unlabelled RNA fragments, the cis-acting element involved in this binding was the sequence 2B1-4. 2B1-4 is a 35-base (3521-3555, CCAGUCCUGCUCGUUGUGGGCGUGCACCGAGGGGG) GC-rich region just past the splice site (3495). Nuclear extracts decreased the electrophoretic mobility of the radiolabelled 2B1-4 RNA which bound to two proteins (19 and 21 kDa) in cross-linking experiments. Excess 2B1-4 RNA decreased the decay of the 2B1 RNA by the nuclear protein extract. 2B1-del 4 RNA (2B1 with the 2B1-4 domain deleted) also decayed more slowly than the control 2B1 RNA. Thus SERCA2b contains a novel GC-rich cis-acting element involved in its decay by nuclear proteins.
Collapse
Affiliation(s)
- Christine M. Misquitta
- *Department of Biology, HSC 4N41 McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5
| | - Paromita Ghosh
- †Department of Medicine, HSC 4N41 McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5
| | - James Mwanjewe
- †Department of Medicine, HSC 4N41 McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5
| | - Ashok K. Grover
- *Department of Biology, HSC 4N41 McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5
- †Department of Medicine, HSC 4N41 McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5
- To whom correspondence should be addressed (email )
| |
Collapse
|
49
|
Spruill LS, McDermott PJ. Role of the 5'-untranslated region in regulating translational efficiency of specific mRNAs in adult cardiocytes. FASEB J 2009; 23:2879-87. [PMID: 19417087 DOI: 10.1096/fj.08-128447] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
It has been hypothesized that translational efficiency is determined by the amount of secondary structure in the 5'-untranslated region (5'-UTR) of mRNA. Here, we examined whether specific 5'-UTRs with excessive secondary structure selectively regulate translational efficiency in adult cardiocytes. Recombinant adenoviruses were generated to express reporter mRNAs consisting of the 5'-UTR derived from c-jun or ornithine decarboxylase (ODC) fused to beta-galactosidase (betaGal) coding sequence. Each adenovirus expressed GFP mRNA as a control for 5'-UTRs with minimal secondary structure. Subsequently, cardiocytes were electrically stimulated to contract at 1 Hz to accelerate protein synthesis as compared to quiescent controls. Translational efficiency was calculated by measuring protein expression as a function of mRNA levels. Translational efficiency of c-jun/betaGal mRNA increased significantly by 3.7-fold in contracting vs. quiescent cardiocytes, but ODC/betaGal mRNA was unchanged. Contraction increased c-jun/betaGal mRNA levels in polyribosomes by 2.3-fold, which indicates that translational efficiency was enhanced by mobilization. A short, unstructured 5'-UTR was sufficient for efficient translation of betaGal mRNA in quiescent and contracting cardiocytes. GFP mRNA produced similar results. These studies demonstrate that the 5'-UTR functions as a determinant of translational efficiency of specific mRNAs, such as c-jun, that regulate growth of the adult cardiocyte.
Collapse
Affiliation(s)
- Laura S Spruill
- Gazes Cardiac Research Institute, Department of Medicine, Medical University of South Carolina, Charleston, SC 29403, USA
| | | |
Collapse
|
50
|
Cationic PMMA nanoparticles bind and deliver antisense oligoribonucleotides allowing restoration of dystrophin expression in the mdx mouse. Mol Ther 2009; 17:820-7. [PMID: 19240694 DOI: 10.1038/mt.2009.8] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
For subsets of Duchenne muscular dystrophy (DMD) mutations, antisense oligoribonucleotide (AON)-mediated exon skipping has proven to be efficacious in restoring the expression of dystrophin protein. In the mdx murine model systemic delivery of AON, recognizing the splice donor of dystrophin exon 23, has shown proof of concept. Here, we show that using cationic polymethylmethacrylate (PMMA) (marked as T1) nanoparticles loaded with a low dose of 2'-O-methyl-phosphorothioate (2'OMePS) AON delivered by weekly intraperitoneal (IP) injection (0.9 mg/kg/week), could restore dystrophin expression in body-wide striated muscles. Delivery of an identical dose of naked AON did not result in detectable dystrophin expression. Transcription, western, and immunohistochemical analysis showed increased levels of dystrophin transcript and protein, and correct localization at the sarcolemma. This study shows that T1 nanoparticles have the capacity to bind and convoy AONs in body-wide muscle tissues and to reduce the dose required for dystrophin rescue. By immunofluorescence and electron microscopy studies, we highlighted the diffusion pathways of this compound. This nonviral approach may valuably improve the therapeutic usage of AONs in DMD as well as the delivery of RNA molecules with many implications in both basic research and medicine.
Collapse
|