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Huang SC, Huang CC, Ko CY, Huang CY, Liu CH, Lee YK, Chen TY, Hsueh CW, Tzou SJ, Tai MH, Hu TH, Tsai MC, Lee WC, Ho YC, Wu CC, Chang YC, Chang JJ, Liu KH, Li CC, Wen ZH, Chang CL, Chu TH. Slow skeletal muscle troponin T acts as a potential prognostic biomarker and therapeutic target for hepatocellular carcinoma. Gene 2023; 865:147331. [PMID: 36871674 DOI: 10.1016/j.gene.2023.147331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Accepted: 02/28/2023] [Indexed: 03/07/2023]
Abstract
Slow skeletal muscle troponin T (TNNT1) as a poor prognostic indicator is upregulated in colon and breast cancers. However, the role of TNNT1 in the disease prognosis and biological functions of hepatocellular carcinoma (HCC) is still unclear. The Cancer Genome Atlas (TCGA), real-time quantitative RT-PCR (qRT-PCR), immunoblot, and immunohistochemical analyses were applied to evaluate the TNNT1 expression of human HCC. The impact of TNNT1 levels on disease progression and survival outcome was studied using TCGA analysis. Moreover, the bioinformatics analysis and HCC cell culture were used to investigate the biological functions of TNNT1. Besides, the immunoblot analysis and enzyme-linked immunosorbent assay (ELISA) were used to detect the extracellular TNNT1 of HCC cells and circulating TNNT1 of HCC patients, respectively. The effect of TNNT1 neutralization on oncogenic behaviors and signaling was further validated in the cultured hepatoma cells. In this study, tumoral and blood TNNT1 was upregulated in HCC patients based on the analyses using bioinformatics, fresh tissues, paraffin sections, and serum. From the multiple bioinformatics tools, the TNNT1 overexpression was associated with advanced stage, high grade, metastasis, vascular invasion, recurrence, and poor survival outcome in HCC patients. By the cell culture and TCGA analyses, TNNT1 expression and release were positively correlated with epithelial-mesenchymal transition (EMT) processes in HCC tissues and cells. Moreover, TNNT1 neutralization suppressed oncogenic behaviors and EMT in hepatoma cells. In conclusion, TNNT1 may serve as a non-invasive biomarker and drug target for HCC management. This research finding may provide a new insight for HCC diagnosis and treatment.
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Affiliation(s)
- Shih-Chung Huang
- Department of Internal Medicine, Division of Cardiology, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan; Department of Internal Medicine, Division of Cardiology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan; Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung, Taiwan
| | - Chao-Cheng Huang
- Department of Pathology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chou-Yuan Ko
- Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung, Taiwan; Division of Gastroenterology and Hepatology, Department of Internal Medicine, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Cheng-Yi Huang
- Department of Pathology, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Ching-Han Liu
- Department of Internal Medicine, Division of Cardiology, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Yung-Kuo Lee
- Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung, Taiwan; Medical Laboratory, Medical Education and Research Center, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Tung-Yuan Chen
- Department of Surgery, Division of Colorectal Surgery, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Chao-Wen Hsueh
- Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung, Taiwan; Division of Gastroenterology and Hepatology, Department of Internal Medicine, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Shiow-Jyu Tzou
- Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung, Taiwan; Department of Nursing, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Ming-Hong Tai
- Institute of Biomedical Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan; Doctoral Degree Program in Marine Biotechnology, National Sun Yat-sen University and Academia Sinica, Kaohsiung, Taiwan; Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan; Center for Neuroscience, National Sun Yat-sen University, Kaohsiung, Taiwan
| | - Tsung-Hui Hu
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Ming-Chao Tsai
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Wen-Chin Lee
- Department of Internal Medicine, Division of Nephrology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Yu-Cheng Ho
- School of Medicine, Medical College, I-Shou University, Kaohsiung, Taiwan
| | - Cheng-Chun Wu
- School of Medicine, Medical College, I-Shou University, Kaohsiung, Taiwan
| | - Yi-Chen Chang
- Doctoral Degree Program in Marine Biotechnology, National Sun Yat-sen University and Academia Sinica, Kaohsiung, Taiwan
| | - Jung-Jui Chang
- Division of Orthopedics, Department of Surgery, Zuoying Branch of Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Kai-Hsi Liu
- Department of Internal Medicine, Division of Cardiology, Zuoying Branch of Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Chiao-Ching Li
- Division of Urology, Department of Surgery, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Zhi-Hong Wen
- Department of Marine Biotechnology and Resources, Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung, Taiwan
| | - Chen-Lin Chang
- Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung, Taiwan; Department of Psychiatry, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan.
| | - Tian-Huei Chu
- Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung, Taiwan; Medical Laboratory, Medical Education and Research Center, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan.
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Johnston JR, Chase PB, Pinto JR. Troponin through the looking-glass: emerging roles beyond regulation of striated muscle contraction. Oncotarget 2017; 9:1461-1482. [PMID: 29416706 PMCID: PMC5787451 DOI: 10.18632/oncotarget.22879] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 11/20/2017] [Indexed: 01/03/2023] Open
Abstract
Troponin is a heterotrimeric Ca2+-binding protein that has a well-established role in regulating striated muscle contraction. However, mounting evidence points to novel cellular functions of troponin, with profound implications in cancer, cardiomyopathy pathogenesis and skeletal muscle aging. Here, we highlight the non-canonical roles and aberrant expression patterns of troponin beyond the sarcomeric milieu. Utilizing bioinformatics tools and online databases, we also provide pathway, subcellular localization, and protein-protein/DNA interaction analyses that support a role for troponin in multiple subcellular compartments. This emerging knowledge challenges the conventional view of troponin as a sarcomere-specific protein exclusively involved in muscle contraction and may transform the way we think about sarcomeric proteins, particularly in the context of human disease and aging.
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Affiliation(s)
- Jamie R Johnston
- Department of Biomedical Sciences, The Florida State University College of Medicine, Tallahassee, FL, 32306-4300, USA
| | - P Bryant Chase
- Department of Biological Science, The Florida State University, Tallahassee, FL, 32306-4370, USA
| | - Jose Renato Pinto
- Department of Biomedical Sciences, The Florida State University College of Medicine, Tallahassee, FL, 32306-4300, USA
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Grewal JS, Tsai JY, Khan SR. Oxalate-inducible AMBP gene and its regulatory mechanism in renal tubular epithelial cells. Biochem J 2006; 387:609-16. [PMID: 15533056 PMCID: PMC1134990 DOI: 10.1042/bj20041465] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The AMBP [A1M (alpha1-microglobulin)/bikunin precursor] gene encodes two plasma glycoproteins: A1M, an immunosuppressive lipocalin, and bikunin, a member of plasma serine proteinase inhibitor family with prototypical Kunitz-type domain. Although previously believed to be constitutively expressed exclusively in liver, the present study demonstrates the induction of this gene by oxalate in porcine proximal tubular LLC-PK1 cells and rat kidney. In liver, the precursor protein is cleaved in the Golgi network by a furin-like enzyme to release constituent proteins, which undergo glycosylation before their export from the cell. In the renal tubular cells, A1M and bikunin co-precipitate, indicating lack of cleavage of the precursor protein. As the expression of the AMBP gene is regulated by A1M-specific cis elements and transcription factors, A1M protein was studied as a representative of AMBP gene expression in renal cells. Oxalate treatment (500 microM) resulted in a time- and dose-dependent induction of A1M protein in LLC-PK1 cells. Of the four transcription factors, HNF-4 (hepatocyte nuclear factor-4) has been reported previously to be a major regulator of AMBP gene expression in liver. Electrophoretic mobility-shift assay, supershift assay, immunoreactivity assay and transfection-based studies showed the presence of an HNF-4 or an HNF-4-like protein in the kidney, which can affect the expression of the AMBP gene. In situ hybridization and immunocytochemical studies showed that the expression of this gene in kidney was mainly restricted to cells lining the renal tubular system.
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Affiliation(s)
- Jasjit S Grewal
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL 32610-0275, USA.
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Antin PB, Bales MA, Zhang W, Garriock RJ, Yatskievych TA, Bates MA. Precocious expression of cardiac troponin T in early chick embryos is independent of bone morphogenetic protein signaling. Dev Dyn 2002; 225:135-41. [PMID: 12242713 DOI: 10.1002/dvdy.10148] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Cardiac troponin T (cTNT) is a component of the troponin complex, which confers calcium sensitivity to contraction in skeletal and cardiac muscle. Although it is thought that most components of the contractile myofibril are expressed exclusively in differentiated muscle cells, we observed that mRNAs coding for cTNT were detectable in explanted late gastrula mesoderm at least 12 hr before cardiac myocyte differentiation. We therefore conducted a detailed analysis of cTNT gene expression in the early chick embryo. Whole-mount in situ hybridization studies showed that by Hamburger and Hamilton stage 5, cTNT mRNAs are detectable in lateral mesoderm and, by stage 6, are observed throughout the lateral embryonic and extraembryonic mesoderm in a distribution that is much broader than the recognized heart field. As myocardial cell differentiation commences, cTNT transcripts become progressively localized to the forming heart and, by stage 14, are completely restricted to heart muscle cells. Western blot analyses demonstrated that cTNT protein expression is under translational control, as cTNT protein is not detectable until stage 9, concomitant with myocardial cell differentiation. Removal of endoderm at stage 5 had no effect on cTNT mRNA levels, and the bone morphogenetic protein (BMP) inhibitor noggin failed to block cTNT expression, even in the heart-forming region and in cases where heart formation was inhibited. Implantation of noggin-expressing CHO cells at the anterior midline of stage 7 embryos resulted in cardia bifida. These findings demonstrate the precocious, BMP-independent expression of a gene coding for a myofibrillar protein and suggest that an additional regulatory pathway exists for activation of some cardiogenic genes.
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Affiliation(s)
- Parker B Antin
- Department of Cell Biology and Anatomy, University of Arizona, Tucson, Arizona 85724, USA.
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Grewal JS, Luttrell LM, Raymond JR. G Protein-coupled Receptors Desensitize and Down-regulate Epidermal Growth Factor Receptors in Renal Mesangial Cells. J Biol Chem 2001; 276:27335-44. [PMID: 11371570 DOI: 10.1074/jbc.m103578200] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Different types of plasma membrane receptors engage in various forms of cross-talk. We used cultures of rat renal mesangial cells to study the regulation of EGF receptors (EGFRs) by various endogenous G protein-coupled receptors (GPCRs). GPCRs (5-hydroxytryptamine(2A), lysophosphatidic acid, angiotensin AT(1), bradykinin B(2)) were shown to transactivate EGFRs through a protein kinase C-dependent pathway. This transactivation resulted in the initiation of multiple cellular signals (phosphorylation of the EGFRs and ERK and activation of cAMP-responsive element-binding protein (CREB), NF-kappaB, and E2F), as well as subsequent rapid down-regulation of cell-surface EGFRs and internalization and desensitization of the EGFRs without change in the total cellular complement of EGFRs. Internalization of the EGFRs and the down-regulation of cell-surface receptors in mesangial cells were blocked by pharmacological inhibitors of clathrin-mediated endocytosis and in HEK293 cells by transfection of cDNA constructs that encode dominant negative beta-arrestin-1 or dynamin. Whereas all of the effects of GPCRs on EGFRs were dependent to a great extent on protein kinase C, those initiated by EGF were not. These studies demonstrate that GPCRs can induce multiple signals through protein kinase C-dependent transactivation of EGFRs. Moreover, GPCRs induce profound desensitization of EGFRs by a process associated with the loss of cell-surface EGFRs through clathrin-mediated endocytosis.
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Affiliation(s)
- J S Grewal
- Nephrology Division, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina 29425, USA
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