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Shu Y, Xia J, Yu Q, Wang G, Zhang J, He J, Wang H, Zhang L, Wu H. Integrated analysis of mRNA and miRNA expression profiles reveals muscle growth differences between adult female and male Chinese concave-eared frogs (Odorrana tormota). Gene 2018; 678:241-251. [PMID: 30103010 DOI: 10.1016/j.gene.2018.08.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Revised: 07/24/2018] [Accepted: 08/02/2018] [Indexed: 02/07/2023]
Abstract
The Chinese concave-eared torrent frog (Odorrana tormota) is the first known non-mammalian vertebrate that can communicate using ultrasound. In this species, females are approximately four times as large as males, in which the female growth rate is obviously higher than that of male. Until now, the molecular mechanisms underlying muscle growth development differences between male and female frogs have not been reported. Here, we integrated mRNA and miRNA expression profiles to reveal growth differences in the hindlimb muscles of 2-year-old frogs. Among 569 differentially expressed genes (DEGs), 69 were associated with muscle growth and regeneration. Fifty-one up-regulated genes in females were potentially involved in promoting muscle growth and regeneration, whereas 18 up-regulated genes in males may lead to muscle growth inhibition and fast-twitch muscle fiber contraction. 244 DEGs were enriched in mTOR and other protein synthesis signaling pathways, and protein degradation pathways, including lysosomal protease, calpain, caspase, and ubiquitin-proteasome system pathways. It may interpret why female muscles grow faster than males. Based on expression differences of genes involved in glycolysis and oxidative metabolism, we speculated that the proportion of slow muscle fiber was higher and that of fast muscle fiber was lower in female compared with male muscle. Additionally, 767 miRNAs were identified, including 217 new miRNAs, and 6248 miRNA-negatively regulated mRNAs were predicted. The miRNA target genes were enriched in pathways related to muscle growth, protein synthesis, and degradation. Thus, in addition to the identified mRNA differential expressions, miRNAs may play other important roles in the differential regulation of hindlimb muscle growth between female and male O. tormota.
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Affiliation(s)
- Yilin Shu
- Key Laboratory for the Conservation and Utilization of Important Biological Resources of Anhui Province, Wuhu 241000, China; College of Life Sciences, Anhui Normal University, Wuhu 241000, China
| | - Jinquan Xia
- Key Laboratory for the Conservation and Utilization of Important Biological Resources of Anhui Province, Wuhu 241000, China; College of Life Sciences, Anhui Normal University, Wuhu 241000, China
| | - Qiang Yu
- Key Laboratory for the Conservation and Utilization of Important Biological Resources of Anhui Province, Wuhu 241000, China; College of Life Sciences, Anhui Normal University, Wuhu 241000, China
| | - Gang Wang
- Key Laboratory for the Conservation and Utilization of Important Biological Resources of Anhui Province, Wuhu 241000, China; College of Life Sciences, Anhui Normal University, Wuhu 241000, China
| | - Jihui Zhang
- Key Laboratory for the Conservation and Utilization of Important Biological Resources of Anhui Province, Wuhu 241000, China; College of Life Sciences, Anhui Normal University, Wuhu 241000, China
| | - Jun He
- Key Laboratory for the Conservation and Utilization of Important Biological Resources of Anhui Province, Wuhu 241000, China; College of Life Sciences, Anhui Normal University, Wuhu 241000, China
| | - Huan Wang
- Key Laboratory for the Conservation and Utilization of Important Biological Resources of Anhui Province, Wuhu 241000, China; College of Life Sciences, Anhui Normal University, Wuhu 241000, China
| | - Ling Zhang
- Department of Occupational and Environmental Health, School of Public Health, Wuhan University of Science and Technology, China; Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, China.
| | - Hailong Wu
- Key Laboratory for the Conservation and Utilization of Important Biological Resources of Anhui Province, Wuhu 241000, China; College of Life Sciences, Anhui Normal University, Wuhu 241000, China.
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2
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Abstract
Cell cycle progression is tightly regulated by cyclin-dependent kinases (CDKs). The ankyrin-repeat protein p19INK4d functions as a key regulator of G1/S transition; however, its molecular mode of action is unknown. Here, we combine cell and structural biology methods to unravel the mechanism by which p19INK4d controls cell cycle progression. We delineate how the stepwise phosphorylation of p19INK4d Ser66 and Ser76 by cell cycle-independent (p38) and -dependent protein kinases (CDK1), respectively, leads to local unfolding of the three N-terminal ankyrin repeats of p19INK4d This dissociates the CDK6-p19INK4d inhibitory complex and, thereby, activates CDK6. CDK6 triggers entry into S-phase, whereas p19INK4d is ubiquitinated and degraded. Our findings reveal how signaling-dependent p19INK4d unfolding contributes to the irreversibility of G1/S transition.
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Abstract
Diabetes is the most common metabolic disorder and is recognized as one of the most important health threats of our time. MicroRNAs (miRNAs) are a novel group of non-coding small RNAs that have been implicated in a variety of physiological processes, including glucose homeostasis. Recent research has suggested that miRNAs play a critical role in the pathogenesis of diabetes and its related cardiovascular complications. This review focuses on the aberrant expression of miRNAs in diabetes and examines their role in the pathogenesis of endothelial dysfunction, cardiovascular disease, and diabetic retinopathy. Furthermore, we discuss the potential role of miRNAs as blood biomarkers and examine the potential of therapeutic interventions targeting miRNAs in diabetes.
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Affiliation(s)
- Saran Shantikumar
- Laboratory of Vascular Pathology and Regeneration, Bristol Heart Institute and School of Clinical Science-Regenerative Medicine Section, University of Bristol, Bristol Royal Infirmary, Marlborough Street, BS2 8HW Bristol, UK
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4
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Comparative analysis of serum proteomes of patients with cardiovascular disease. Clin Biochem 2010; 44:178-84. [PMID: 20934420 DOI: 10.1016/j.clinbiochem.2010.09.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2010] [Revised: 09/27/2010] [Accepted: 09/28/2010] [Indexed: 11/21/2022]
Abstract
OBJECTIVES To monitor increases or decreases in cardiovascular disease (CVD)-related proteins that will be released from the deposits or plaque on the inner wall of blood vessels. DESIGN AND METHODS Protein profiles of sera from healthy subjects and CVD patients were determined via 2-DE. Differentially expressed spots in CVD patients were identified by ESI-Q-TOF MS/MS. Retinol binding protein 4 (RBP4), ceruloplasmin, and hemopexin were confirmed by Western blotting and RBP4 was further verified by ELISA. RESULTS Approximately, 400 spots were detected in each gel via comparisons of the serum proteome. Among these spots, 19 spots were selected and identified by ESI-Q-TOF MS/MS (P<0.05). The expression levels of RBP4 and ceruloplasmin were higher in CVD patients by Western blotting. The level of immunoreactive RBP4 in CVD patients was higher than that in healthy subjects. CONCLUSIONS The three proteins identified in the present study may constitute potential biomarkers for the diagnosis of CVD in patients.
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Tee JM, Peppelenbosch MP. Anchoring skeletal muscle development and disease: the role of ankyrin repeat domain containing proteins in muscle physiology. Crit Rev Biochem Mol Biol 2010; 45:318-30. [PMID: 20515317 PMCID: PMC2942773 DOI: 10.3109/10409238.2010.488217] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The ankyrin repeat is a protein module with high affinity for other ankyrin repeats based on strong Van der Waals forces. The resulting dimerization is unusually resistant to both mechanical forces and alkanization, making this module exceedingly useful for meeting the extraordinary demands of muscle physiology. Many aspects of muscle function are controlled by the superfamily ankyrin repeat domain containing proteins, including structural fixation of the contractile apparatus to the muscle membrane by ankyrins, the archetypical member of the family. Additionally, other ankyrin repeat domain containing proteins critically control the various differentiation steps during muscle development, with Notch and developmental stage-specific expression of the members of the Ankyrin repeat and SOCS box (ASB) containing family of proteins controlling compartment size and guiding the various steps of muscle specification. Also, adaptive responses in fully formed muscle require ankyrin repeat containing proteins, with Myotrophin/V-1 ankyrin repeat containing proteins controlling the induction of hypertrophic responses following excessive mechanical load, and muscle ankyrin repeat proteins (MARPs) acting as protective mechanisms of last resort following extreme demands on muscle tissue. Knowledge on mechanisms governing the ordered expression of the various members of superfamily of ankyrin repeat domain containing proteins may prove exceedingly useful for developing novel rational therapy for cardiac disease and muscle dystrophies.
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Affiliation(s)
- Jin-Ming Tee
- Hubrecht Institute for Developmental Biology and Stem Cell Research-University Medical Center Utrecht, Uppsalalaan 8, 3584 CT, Utrecht, The Netherlands
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Nirmalanandhan VS, Sittampalam GS. Stem cells in drug discovery, tissue engineering, and regenerative medicine: emerging opportunities and challenges. ACTA ACUST UNITED AC 2009; 14:755-68. [PMID: 19675315 DOI: 10.1177/1087057109336591] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Stem cells, irrespective of their origin, have emerged as valuable reagents or tools in human health in the past 2 decades. Initially, a research tool to study fundamental aspects of developmental biology is now the central focus of generating transgenic animals, drug discovery, and regenerative medicine to address degenerative diseases of multiple organ systems. This is because stem cells are pluripotent or multipotent cells that can recapitulate developmental paths to repair damaged tissues. However, it is becoming clear that stem cell therapy alone may not be adequate to reverse tissue and organ damage in degenerative diseases. Existing small-molecule drugs and biologicals may be needed as "molecular adjuvants" or enhancers of stem cells administered in therapy or adult stem cells in the diseased tissues. Hence, a combination of stem cell-based, high-throughput screening and 3D tissue engineering approaches is necessary to advance the next wave of tools in preclinical drug discovery. In this review, the authors have attempted to provide a basic account of various stem cells types, as well as their biology and signaling, in the context of research in regenerative medicine. An attempt is made to link stem cells as reagents, pharmacology, and tissue engineering as converging fields of research for the next decade.
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Affiliation(s)
- Victor Sanjit Nirmalanandhan
- University of Kansas Medical Center & Kansas Masonic Cancer Research Center, Department of Pharmacology Toxicology and Therapeutics, The Institute for Advancing Medical Innovation, Kansas City, Kansas 66160, USA
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Abstract
MicroRNAs (miRNAs) are tiny, endogenous, conserved, non-coding RNAs that negatively modulate gene expression by either promoting the degradation of mRNA or down-regulating the protein production by translational repression. They maintain optimal dose of cellular proteins and thus play a crucial role in the regulation of biological functions. Recent discovery of miRNAs in the heart and their differential expressions in pathological conditions provide glimpses of undiscovered regulatory mechanisms underlying cardiovascular diseases. Nearly 50 miRNAs are overexpressed in mouse heart. The implication of several miRNAs in cardiovascular diseases has been well documented such as miRNA-1 in arrhythmia, miRNA-29 in cardiac fibrosis, miRNA-126 in angiogenesis and miRNA-133 in cardiac hypertrophy. Aberrant expression of Dicer (an enzyme required for maturation of all miRNAs) during heart failure indicates its direct involvement in the regulation of cardiac diseases. MiRNAs and Dicer provide a particular layer of network of precise gene regulation in heart and vascular tissues in a spatiotemporal manner suggesting their implications as a powerful intervention tool for therapy. The combined strategy of manipulating miRNAs in stem cells for their target directed differentiation and optimizing the mode of delivery of miRNAs to the desired cells would determine the future potential of miRNAs to treat a disease. This review embodies the recent progress made in microRNomics of cardiovascular diseases and the future of miRNAs as a potential therapeutic target - the putative challenges and the approaches to deal with it.
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Affiliation(s)
- Paras Kumar Mishra
- Department of Physiology & Biophysics, University of Louisville School of Medicine, KY, USA
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8
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Tang X, Tang G, Ozcan S. Role of microRNAs in diabetes. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2008; 1779:697-701. [PMID: 18655850 DOI: 10.1016/j.bbagrm.2008.06.010] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Revised: 06/18/2008] [Accepted: 06/27/2008] [Indexed: 11/17/2022]
Abstract
Diabetes is one of the most common chronic diseases in the world. Multiple and complex factors including various genetic and physiological changes can lead to type 1 and type 2 diabetes. However, the major mechanisms underlying the pathogenesis of diabetes remain obscure. With the recent discovery of microRNAs (miRNAs), these small ribonucleotides have been implicated as new players in the pathogenesis of diabetes and diabetes-associated complications. MiRNAs have been shown to regulate insulin production, insulin secretion, and insulin action. This review summarizes the recent progress in the cutting-edge research of miRNAs involved in diabetes and diabetes related complications.
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Affiliation(s)
- Xiaoqing Tang
- Department of Molecular and Cellular Biochemistry, University of Kentucky, College of Medicine, 741 South Limestone, Lexington, KY 40536, USA.
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9
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Harvey AJ, Kind KL, Thompson JG. Regulation of gene expression in bovine blastocysts in response to oxygen and the iron chelator desferrioxamine. Biol Reprod 2007; 77:93-101. [PMID: 17329595 DOI: 10.1095/biolreprod.106.058826] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Low (2%) oxygen conditions during postcompaction culture of bovine blastocysts improve embryo quality and are associated with small increases in the expression of glucose transporter 1 (SLC2A1), anaphase promoting complex (ANAPC1), and myotrophin (MTPN), suggesting a role for oxygen in the regulation of embryo development, mediated through oxygen-sensitive gene expression. However, bovine embryos, to at least the blastocyst stage, lack detectable levels of the key regulator of oxygen-sensitive gene expression, hypoxia-inducible 1 alpha (HIF1A), while the less well-characterized HIF2 alpha protein is readily detectable. Here we report that other key HIF1 regulated genes are not significantly altered in their expression pattern in bovine blastocysts in response to reduced oxygen concentrations postcompaction-with the exception of lactate dehydrogenase A (LDHA), which was significantly increased following 2% oxygen culture. Antioxidant enzymes have been suggested as potential HIF2 target genes, but their expression was not altered following low-oxygen culture in the bovine blastocyst. The addition of desferrioxamine (an iron chelator and inducer of HIF-regulated gene expression) during postcompaction stages significantly increased SLC2A1, LDHA, inducible nitric oxide synthase (NOS2A), and MTPN gene expression in bovine blastocysts, although development to the blastocyst stage was not significantly affected. These results further suggest that expression of genes, known to be regulated by oxygen via HIF-1 in somatic cells, is not influenced by oxygen during preimplantation postcompaction bovine embryo development. Oxygen-regulated expression of LDHA and SLC2A1 in bovine blastocysts suggests that regulation of these genes may be mediated by HIF2. Furthermore, the effect of a reduced-oxygen environment on gene expression can be mimicked in vitro through the use of desferrioxamine. These results further support our data that the bovine blastocyst stage embryo is unique in its responsiveness to oxygen compared with somatic cells, in that the lack of HIF1-mediated gene expression reduces the overall response to low (physiological) oxygen environments, which appear to favor development.
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Affiliation(s)
- A J Harvey
- Research Centre for Reproductive Health, Discipline of Obstetrics and Gynecology, Medical School, The University of Adelaide, Adelaide, South Australia 5005, Australia.
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10
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Xiong Z, Liu E, Yan Y, Silver RT, Yang F, Chen IH, Chen Y, Verstovsek S, Wang H, Prchal J, Yang XF. An unconventional antigen translated by a novel internal ribosome entry site elicits antitumor humoral immune reactions. THE JOURNAL OF IMMUNOLOGY 2006; 177:4907-16. [PMID: 16982933 PMCID: PMC3902139 DOI: 10.4049/jimmunol.177.7.4907] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Self-tumor Ags that elicit antitumor immune responses in responses to IFN-alpha stimulation remain poorly defined. We screened a human testis cDNA library with sera from three polycythemia vera patients who responded to IFN-alpha and identified a novel Ag, MPD6. MPD6 belongs to the group of cryptic Ags without conventional genomic structure and is encoded by a cryptic open reading frame located in the 3'-untranslated region of myotrophin mRNA. MPD6 elicits IgG Ab responses in a subset of polycythemia vera patients, as well as patients with chronic myelogenous leukemia and prostate cancer, suggesting that it is broadly immunogenic. The expression of myotrophin-MPD6 transcripts was up-regulated in some tumor cells, but only slightly increased in K562 cells in response to IFN-alpha treatment. By using bicistronic reporter constructs, we showed that the translation of MPD6 was mediated by a novel internal ribosome entry site (IRES) upstream of the MPD6 reading frame. Furthermore, the MPD6-IRES-mediated translation, but not myotrophin-MPD6 transcription, was significantly up-regulated in response to IFN-alpha stimulation. These findings demonstrate that a novel IRES-mediated mechanism may be responsible for the translation of unconventional self-Ag MPD6 in responsive to IFN-alpha stimulation. The eliciting antitumor immune response against unconventional Ag MPD6 in patients with myeloproliferative diseases suggests MPD6 as a potential target of novel immunotherapy.
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MESH Headings
- Amino Acid Sequence
- Antigens, Neoplasm/chemistry
- Antigens, Neoplasm/physiology
- Antigens, Neoplasm/ultrastructure
- Blotting, Northern
- Blotting, Western
- Enzyme-Linked Immunosorbent Assay
- Gene Library
- Humans
- Intercellular Signaling Peptides and Proteins/genetics
- Intercellular Signaling Peptides and Proteins/immunology
- Interferon-gamma/immunology
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/immunology
- Male
- Molecular Sequence Data
- Polycythemia Vera/immunology
- Prostatic Neoplasms/immunology
- Protein Biosynthesis
- Protein Structure, Secondary
- RNA, Messenger/analysis
- Reverse Transcriptase Polymerase Chain Reaction
- Ribosomes/chemistry
- Ribosomes/genetics
- Ribosomes/ultrastructure
- Testis/physiology
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Affiliation(s)
- Zeyu Xiong
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA 19140
| | - Enli Liu
- Department of Medicine, Baylor College of Medicine, Houston, TX 77030
| | - Yan Yan
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA 19140
| | - Richard T. Silver
- Department of Medicine, New York Presbyterian-Weill Cornell Medical Center, New York, NY 10021
| | - Fan Yang
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA 19140
| | - Irene H. Chen
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA 19140
| | - Yangyang Chen
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA 19140
| | - Srdan Verstovsek
- Department of Leukemia, University of Texas M. D. Anderson Cancer Center, Houston, TX 77030
| | - Hong Wang
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA 19140
| | - Josef Prchal
- Department of Medicine, University of Utah School of Medicine, Salt Lake City, UT 84112
- Department of Medicine, Baylor College of Medicine, Houston, TX 77030
| | - Xiao-Feng Yang
- Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA 19140
- Address correspondence and reprint requests to Dr. Xiao-Feng Yang, Department of Pharmacology, Temple University School of Medicine, 3420 North Broad Street, Philadelphia, PA 19140.
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Sen CK, Roy S. Relief from a heavy heart: redox-sensitive NF-kappaB as a therapeutic target in managing cardiac hypertrophy. Am J Physiol Heart Circ Physiol 2005; 289:H17-9. [PMID: 15961373 DOI: 10.1152/ajpheart.00250.2005] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Adhikary G, Gupta S, Sil P, Saad Y, Sen S. Characterization and functional significance of myotrophin: a gene with multiple transcripts. Gene 2005; 353:31-40. [PMID: 15946807 DOI: 10.1016/j.gene.2005.03.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2004] [Revised: 03/07/2005] [Accepted: 03/22/2005] [Indexed: 10/25/2022]
Abstract
The underlying mechanism for the development of cardiac hypertrophy that advances to heart failure is not known. Many factors have been implied to play a role in this process. Among others, we have isolated and identified myotrophin, a factor that stimulates myocytes growth, from spontaneously hypertensive rat (SHR) heart and patients with dilated cardiomyopathy. The gene encoding myotrophin has been cloned and expressed in E. coli. Recently, myotrophin gene has been mapped and shown to be a novel gene localized in human chromosome 7q-33. To define the characteristics of each transcript and its pathophysiological significance, we examined transcripts of myotrophin in SHR heart during progression of hypertrophy. Northern blot analysis of myotrophin mRNA showed multiple transcripts. We isolated and characterized various myotrophin cDNA clones corresponding to the multiple transcripts by 5' "stretch plus" rat heart cDNA library screening. Sequence analysis of these cDNA clones indicates that each clone has a unique 5' UTR and multiple 3' UTR with varying lengths, repeated ATTTA motifs and many polyadenylation signals. In vitro transcripts generated from all these myotrophin-specific cDNA clones translate in vitro to a 12-kD protein. Among pathophysiological significance, we determined mRNA expression in 9 days old, 3 weeks old and 31 weeks old and observed a linear increased during the progression of hypertrophy. In WKY, this mRNA level remained the same throughout the growth and development of hypertrophy. Our data strongly suggest that myotrophin appears to be a candidate gene for cardiac hypertrophy and heart failure.
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MESH Headings
- Amino Acid Sequence
- Animals
- Base Sequence
- Blotting, Northern
- Blotting, Southern
- Cardiomegaly/genetics
- Cardiomegaly/physiopathology
- DNA, Complementary/chemistry
- DNA, Complementary/genetics
- Exons
- Female
- Gene Expression
- Genes/genetics
- Humans
- Intercellular Signaling Peptides and Proteins/genetics
- Intercellular Signaling Peptides and Proteins/physiology
- Introns
- Male
- Molecular Sequence Data
- Myocardium/metabolism
- Polymorphism, Single Nucleotide
- Pregnancy
- Protein Biosynthesis/genetics
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats
- Rats, Inbred SHR
- Rats, Inbred WKY
- Sequence Analysis, DNA
- Time Factors
- Transcription, Genetic/genetics
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Affiliation(s)
- Gautam Adhikary
- Department of Molecular Cardiology, Cleveland Clinic Foundation, OH 44195, USA
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14
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Abstract
OBJECTIVES The goal of this study was to investigate plasma levels of myotrophin in heart failure (HF) and their relationship to gender and disease severity. BACKGROUND Myotrophin is a myocardial hypertrophy-inducing factor initially demonstrated in hypertrophied and cardiomyopathic hearts. Recent evidence suggests an interaction with the transcription factor nuclear factor kappa B (NFkappaB), which is activated in HF and modulates myocardial protein expression. It is unknown whether this peptide has an endocrine/paracrine role in man. We hypothesized that it may have a role in HF and would be raised in plasma. METHODS We developed a competitive binding assay specific for human myotrophin. Myotrophin was measured in plasma extracts of 120 HF patients and 130 age- and gender-matched normal controls. RESULTS Myotrophin in plasma existed as the full-length 12 kD form with also a 2.7 kD form (possibly a degradation product). Log normalized myotrophin levels were significantly elevated in HF patients (mean +/- SEM [geometric mean, range], 2.402 +/- 0.021 [252, 72 to 933] vs. 2.268 +/- 0.021 [185, 28 to 501] fmol/ml, p < 0.0005). There was no relationship between myotrophin and age or gender in controls. However, males with HF had higher levels of myotrophin than females (p < 0.001). There was an inverse relationship of myotrophin levels with New York Heart Association class in patients with no gender difference in the relationship. CONCLUSIONS There is evidence of early activation of the myotrophin system in HF, which is more evident in males. This response is attenuated in more severe disease. The contribution of myotrophin to NFkappaB-mediated gene transcription and preservation of cardiac muscle mass remains to be investigated further.
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Affiliation(s)
- Russell J O'Brien
- Department of Medicine and Therapeutics, University of Leicester, Leicester Royal Infirmary, Leicester, United Kingdom
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15
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Taoka M, Ichimura T, Wakamiya-Tsuruta A, Kubota Y, Araki T, Obinata T, Isobe T. V-1, a protein expressed transiently during murine cerebellar development, regulates actin polymerization via interaction with capping protein. J Biol Chem 2003; 278:5864-70. [PMID: 12488317 DOI: 10.1074/jbc.m211509200] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
V-1 is a 12-kDa protein consisting of three consecutive ANK repeats, which are believed to serve as the surface for protein-protein interactions. It is thought to have a role in neural development for its temporal profile of expression during murine cerebellar development, but its precise role remains unknown. Here we applied the proteomic approach to search for protein targets that interact with V-1. The V-1 cDNA attached with a tandem affinity purification tag was expressed in the cultured 293T cells, and the protein complex formed within the cells were captured and characterized by mass spectrometry. We detected two polypeptides specifically associated with V-1, which were identified as the alpha and beta subunits of the capping protein (CP, alternatively called CapZ or beta-actinin). CP regulates actin polymerization by capping the barbed end of the actin filament. The V-1.CP complex was detected not only in cultured cells transfected with the V-1 cDNA but also endogenously in cells as well as in murine cerebellar extracts. An analysis of the V-1/CP interaction by surface plasmon resonance spectroscopy showed that V-1 formed a stable complex with the CP heterodimer with a dissociation constant of 1.2 x 10(-7) m and a molecular stoichiometry of approximately 1:1. In addition, V-1 inhibited the CP-regulated actin polymerization in vitro in a dose-dependent manner. Thus, our results suggest that V-1 is a novel component that regulates the dynamics of actin polymerization by interacting with CP and thereby participates in a variety of cellular processes such as actin-driven cell movements and motility during neuronal development.
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Affiliation(s)
- Masato Taoka
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397, Japan.
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16
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Gupta S, Purcell NH, Lin A, Sen S. Activation of nuclear factor-kappaB is necessary for myotrophin-induced cardiac hypertrophy. J Cell Biol 2002; 159:1019-28. [PMID: 12486112 PMCID: PMC2173971 DOI: 10.1083/jcb.200207149] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The transcription factor nuclear factor-kappaB (NF-kappaB) regulates expression of a variety of genes involved in immune responses, inflammation, proliferation, and programmed cell death (apoptosis). Here, we show that in rat neonatal ventricular cardiomyocytes, activation of NF-kappaB is involved in the hypertrophic response induced by myotrophin, a hypertrophic activator identified from spontaneously hypertensive rat heart and cardiomyopathic human hearts. Myotrophin treatment stimulated NF-kappaB nuclear translocation and transcriptional activity, accompanied by IkappaB-alpha phosphorylation and degradation. Consistently, myotrophin-induced NF-kappaB activation was enhanced by wild-type IkappaB kinase (IKK) beta and abolished by the dominant-negative IKKbeta or a general PKC inhibitor, calphostin C. Importantly, myotrophin-induced expression of two hypertrophic genes (atrial natriuretic factor [ANF] and c-myc) and also enhanced protein synthesis were partially inhibited by a potent NF-kappaB inhibitor, pyrrolidine dithio-carbamate (PDTC), and calphostin C. Expression of the dominant-negative form of IkappaB-alpha or IKKbeta also partially inhibited the transcriptional activity of ANF induced by myotrophin. These findings suggest that the PKC-IKK-NF-kappaB pathway may play a critical role in mediating the myotrophin-induced hypertrophic response in cardiomyocytes.
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MESH Headings
- Alkaloids
- Animals
- Animals, Newborn
- Benzophenanthridines
- Blotting, Northern
- Blotting, Western
- Cell Nucleus/metabolism
- Cells, Cultured
- Cytoplasm/metabolism
- DNA, Complementary/metabolism
- Dose-Response Relationship, Drug
- Enzyme Activation
- Genes, Dominant
- Growth Substances/metabolism
- Hypertrophy
- I-kappa B Proteins/metabolism
- Immunohistochemistry
- Intercellular Signaling Peptides and Proteins/metabolism
- Luciferases/metabolism
- Microscopy, Confocal
- Microscopy, Fluorescence
- Myocardium/cytology
- Myocardium/pathology
- NF-KappaB Inhibitor alpha
- NF-kappa B/metabolism
- Naphthalenes/metabolism
- Phenanthridines/metabolism
- Phosphorylation
- Protein Binding
- Protein Kinase C/metabolism
- Protein Transport
- RNA, Messenger/metabolism
- Rats
- Rats, Sprague-Dawley
- Rats, Wistar
- Time Factors
- Transcription, Genetic
- Transfection
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Affiliation(s)
- Sudhiranjan Gupta
- Department of Molecular Cardiology, Lerner Research Institute, The Cleveland Clinic Foundation, Cleveland, OH 44195, USA
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