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Guan J, Wu C, He Y, Lu F. Skin-associated adipocytes in skin barrier immunity: A mini-review. Front Immunol 2023; 14:1116548. [PMID: 36761769 PMCID: PMC9902365 DOI: 10.3389/fimmu.2023.1116548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 01/04/2023] [Indexed: 01/25/2023] Open
Abstract
The skin contributes critically to health via its role as a barrier tissue against a multitude of external pathogens. The barrier function of the skin largely depends on the uppermost epidermal layer which is reinforced by skin barrier immunity. The integrity and effectiveness of skin barrier immunity strongly depends on the close interplay and communication between immune cells and the skin environment. Skin-associated adipocytes have been recognized to play a significant role in modulating skin immune responses and infection by secreting cytokines, adipokines, and antimicrobial peptides. This review summarizes the recent understanding of the interactions between skin-associated adipocytes and other skin cells in maintaining the integrity and effectiveness of skin barrier immunity.
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Affiliation(s)
| | | | - Yunfan He
- *Correspondence: Feng Lu, ; Yunfan He,
| | - Feng Lu
- *Correspondence: Feng Lu, ; Yunfan He,
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2
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Karapetyan L, Gooding W, Li A, Yang X, Knight A, Abushukair HM, Vargas De Stefano D, Sander C, Karunamurthy A, Panelli M, Storkus WJ, Tarhini AA, Kirkwood JM. Sentinel Lymph Node Gene Expression Signature Predicts Recurrence-Free Survival in Cutaneous Melanoma. Cancers (Basel) 2022; 14:4973. [PMID: 36291758 PMCID: PMC9599365 DOI: 10.3390/cancers14204973] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 09/29/2022] [Accepted: 10/01/2022] [Indexed: 11/16/2022] Open
Abstract
We sought to develop a sentinel lymph node gene expression signature score predictive of disease recurrence in patients with cutaneous melanoma. Gene expression profiling was performed on SLN biopsies using U133A 2.0 Affymetrix gene chips. The top 25 genes associated with recurrence-free survival (RFS) were selected and a penalized regression function was used to select 12 genes with a non-zero coefficient. A proportional hazards regression model was used to evaluate the association between clinical covariates, gene signature score, and RFS. Among the 45 patients evaluated, 23 (51%) had a positive SLN. Twenty-one (46.7%) patients developed disease recurrence. For the top 25 differentially expressed genes (DEG), 12 non-zero penalized coefficients were estimated (CLGN, C1QTNF3, ADORA3, ARHGAP8, DCTN1, ASPSCR1, CHRFAM7A, ZNF223, PDE6G, CXCL3, HEXIM1, HLA-DRB). This 12-gene signature score was significantly associated with RFS (p < 0.0001) and produced a bootstrap C index of 0.888. In univariate analysis, Breslow thickness, presence of primary tumor ulceration, SLN positivity were each significantly associated with RFS. After simultaneously adjusting for these prognostic factors in relation to the gene signature, the 12-gene score remained a significant independent predictor for RFS (p < 0.0001). This SLN 12-gene signature risk score is associated with melanoma recurrence regardless of SLN status and may be used as a prognostic factor for RFS.
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Affiliation(s)
- Lilit Karapetyan
- Department of Cutaneous Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | - William Gooding
- Hillman Cancer Center, Biostatistics Facility, Pittsburgh, PA 15213, USA
| | - Aofei Li
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA
| | - Xi Yang
- Department of Medicine, Brigham and Women’s Hospital and Dana Farber Cancer Institute, Boston, MA 02215, USA
| | - Andrew Knight
- Department of Medicine, Division of General Internal Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA
| | - Hassan M. Abushukair
- Faculty of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Danielle Vargas De Stefano
- Department of Pathology, Division of Pediatric Pathology, UPMC Children’s Hospital of Pittsburgh, Pittsburgh, PA 15224, USA
| | - Cindy Sander
- UPMC Hillman Cancer Center, Pittsburgh, PA 15213, USA
| | - Arivarasan Karunamurthy
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA
- Departments of Dermatology and Pathology, Divisions of Dermatopathology and Molecular Genetic Pathology, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA
| | | | - Walter J. Storkus
- Departments of Dermatology, Immunology, Pathology and Bioengineering, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA
| | - Ahmad A. Tarhini
- Departments of Cutaneous Oncology and Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | - John M. Kirkwood
- UPMC Hillman Cancer Center, Pittsburgh, PA 15213, USA
- Department of Medicine, Division of Hematology/Oncology; University of Pittsburgh Medical Center, Hillman Cancer Center, Pittsburgh, PA 15213, USA
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3
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Kong M, Gao Y, Guo X, Xie Y, Yu Y. Role of the CTRP family in tumor development and progression. Oncol Lett 2021; 22:723. [PMID: 34429763 PMCID: PMC8371956 DOI: 10.3892/ol.2021.12984] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 05/19/2021] [Indexed: 12/17/2022] Open
Abstract
C1q tumor necrosis factor-related proteins (CTRPs), which are members of the adipokine superfamily, have gained significant interest in the recent years. CTRPs are homologs of adiponectin with numerous functions and are closely associated with metabolic diseases, such as abnormal glucose and lipid metabolism and diabetes. Previous studies have demonstrated that CTRPs are highly involved in the regulation of numerous physiological and pathological processes, including glycolipid metabolism, protein kinase pathways, cell proliferation, cell apoptosis and inflammation. CTRPs also play important roles in the development and progression of numerous types of tumor, including liver, colon and lung cancers. This observation can be attributed to the fact that diabetes, obesity and insulin resistance are independent risk factors for tumorigenesis. Numerous CTRPs, including CTRP3, CTRP4, CTRP6 and CTRP8, have been reported to be associated with tumor progression by activating multiple signal pathways. CTRPs could therefore be considered as diagnostic markers and therapeutic targets in some cancers. However, the underlying mechanisms of CTRPs in tumorigenesis remain unknown. The present review aimed to determine the roles and underlying mechanisms of CTRPs in tumorigenesis, which may help the development of novel cancer treatments in the future.
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Affiliation(s)
- Mowei Kong
- Department of Endocrinology, Affiliated Hospital of Chengde Medical University, Chengde, Hebei 067000, P.R. China
| | - Yu Gao
- Department of Endocrinology, Affiliated Hospital of Chengde Medical University, Chengde, Hebei 067000, P.R. China
| | - Xiang Guo
- Department of Respiratory, Affiliated Hospital of Chengde Medical University, Chengde, Hebei 067000, P.R. China
| | - Yuyu Xie
- Department of Dermatology, Affiliated Hospital of Chengde Medical University, Chengde, Hebei 067000, P.R. China
| | - Yamei Yu
- Department of Dermatology, Affiliated Hospital of Chengde Medical University, Chengde, Hebei 067000, P.R. China
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4
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Guo B, Zhuang T, Xu F, Lin X, Li F, Shan SK, Wu F, Zhong JY, Wang Y, Zheng MH, Xu QS, Ehsan UMH, Yuan LQ. New Insights Into Implications of CTRP3 in Obesity, Metabolic Dysfunction, and Cardiovascular Diseases: Potential of Therapeutic Interventions. Front Physiol 2020; 11:570270. [PMID: 33343381 PMCID: PMC7744821 DOI: 10.3389/fphys.2020.570270] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 11/10/2020] [Indexed: 02/06/2023] Open
Abstract
Adipose tissue, as the largest endocrine organ, secretes many biologically active molecules circulating in the bloodstream, collectively termed adipocytokines, which not only regulate the metabolism but also play a role in pathophysiological processes. C1q tumor necrosis factor (TNF)-related protein 3 (CTRP3) is a member of C1q tumor necrosis factor-related proteins (CTRPs), which is a paralog of adiponectin. CTRP3 has a wide range of effects on glucose/lipid metabolism, inflammation, and contributes to cardiovascular protection. In this review, we comprehensively discussed the latest research on CTRP3 in obesity, diabetes, metabolic syndrome, and cardiovascular diseases.
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Affiliation(s)
- Bei Guo
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Tongtian Zhuang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Feng Xu
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Xiao Lin
- Department of Radiology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Fuxingzi Li
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Su-Kang Shan
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Feng Wu
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Jia-Yu Zhong
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Yi Wang
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Ming-Hui Zheng
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Qiu-Shuang Xu
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Ullah Muhammad Hasnain Ehsan
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Ling-Qing Yuan
- National Clinical Research Center for Metabolic Diseases, Hunan Provincial Key Laboratory of Metabolic Bone Diseases, and Department of Endocrinology and Metabolism, The Second Xiangya Hospital, Central South University, Changsha, China
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5
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Chen X, Wu Y, Diao Z, Han X, Li D, Ruan X, Liu W. C1q/tumor necrosis factor‐related protein‐3 improves renal fibrosis via inhibiting notch signaling pathways. J Cell Physiol 2019; 234:22352-22364. [PMID: 31074042 DOI: 10.1002/jcp.28801] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Revised: 04/20/2019] [Accepted: 04/24/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Xinpan Chen
- Department of Nephrology, Beijing Friendship Hospital, Faculty of Kidney Diseases Capital Medical University Beijing China
| | - Yiru Wu
- Department of Nephrology, Beijing Friendship Hospital, Faculty of Kidney Diseases Capital Medical University Beijing China
| | - Zongli Diao
- Department of Nephrology, Beijing Friendship Hospital, Faculty of Kidney Diseases Capital Medical University Beijing China
| | - Xue Han
- Department of Nephrology, Beijing Friendship Hospital, Faculty of Kidney Diseases Capital Medical University Beijing China
| | - Dishan Li
- Department of Nephrology, Beijing Friendship Hospital, Faculty of Kidney Diseases Capital Medical University Beijing China
| | - Xiongzhong Ruan
- Department of Nephrology, John Moorhead Research Laboratory, University College London Medical School, Royal Free Campus University College London London United Kingdom
| | - Wenhu Liu
- Department of Nephrology, Beijing Friendship Hospital, Faculty of Kidney Diseases Capital Medical University Beijing China
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Yaribeygi H, Rashidfarrokhi F, Atkin SL, Sahebkar A. C1q/TNF-related protein-3 and glucose homeostasis. Diabetes Metab Syndr 2019; 13:1923-1927. [PMID: 31235116 DOI: 10.1016/j.dsx.2019.04.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 04/24/2019] [Indexed: 12/16/2022]
Abstract
Adipokines are cytokines produced by adipocytes that may mediate inflammatory processes, whilst adipocyte-derived proteins may have the converse effect. C1q/TNF-related protein-3 or CTRP3 is a novel adipokine that is expressed and released by most types of human tissues including adipose tissue. This adipokine, considered as an adiponectin, can normalize blood glucose by several mechanisms. In addition, it can modulate the expression/secretion of other cytokine and adipokines leading to lower insulin resistance in peripheral tissues. Beneficial effects of CTRP3 against hyperglycemia-induced complications in the kidney and eye have been reported. In this review, we have presented the latest findings on the in vitro and in vivo hypoglycemic effects of CTRP3, followed by the findings on the preventive/therapeutic effects of CTRP3 adipokines against diabetes related complications.
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Affiliation(s)
- Habib Yaribeygi
- Chronic Kidney Disease Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Farin Rashidfarrokhi
- Chronic Kidney Disease Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Amirhossein Sahebkar
- Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran; School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
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7
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Abstract
As the largest endocrine organ, adipose tissue secretes many bioactive molecules that circulate in blood, collectively termed adipokines. Efforts to identify such metabolic regulators have led to the discovery of a family of secreted proteins, designated as C1q tumor necrosis factor (TNF)-related proteins (CTRPs). The CTRP proteins, adiponectin, TNF-alpha, as well as other proteins with the distinct C1q domain are collectively grouped together as the C1q/TNF superfamily. Reflecting profound biological potency, the initial characterization of these adipose tissue-derived CTRP factors finds wide-ranging effects upon metabolism, inflammation, and survival-signaling in multiple tissue types. CTRP3 (also known as CORS26, cartducin, or cartonectin) is a unique member of this adipokine family. In this review we provide a comprehensive overview of the research concerning the expression, regulation, and physiological function of CTRP3. © 2017 American Physiological Society. Compr Physiol 7:863-878, 2017.
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Affiliation(s)
- Ying Li
- Quillen College of Medicine, Department of Biomedical Sciences, East Tennessee State University, Johnson City, Tennessee, USA
| | - Gary L Wright
- Quillen College of Medicine, Department of Biomedical Sciences, East Tennessee State University, Johnson City, Tennessee, USA
| | - Jonathan M Peterson
- Quillen College of Medicine, Department of Biomedical Sciences, East Tennessee State University, Johnson City, Tennessee, USA.,College of Public Health, Department of Health Sciences, East Tennessee State University, Johnson City, Tennessee, USA
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8
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Hou Q, Lin J, Huang W, Li M, Feng J, Mao X. CTRP3 Stimulates Proliferation and Anti-Apoptosis of Prostate Cells through PKC Signaling Pathways. PLoS One 2015. [PMID: 26218761 PMCID: PMC4517796 DOI: 10.1371/journal.pone.0134006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
C1q/TNF-related protein-3 (CTRP3) is a novel adipokine with roles in multiple cellular processes. However, little is known about its function in prostate cells. This study investigated the effects and mechanisms of CTRP3 in prostate cells. We first generated and purified CTRP3 protein in HEK 293T cells. Proliferation of RWPE-1 prostate cells was evaluated by MTT analyses under treatment with different concentrations of CTRP3 for various exposure times. The results revealed maximum enhancement of proliferation with 10 μg/mL CTRP3 for 72 h. Cell apoptosis and cell cycle were determined by TUNEL staining and flow cytometry analysis. TUNEL assay showed decreased TUNEL-positive cells in RWPE-1 prostate cells treated with CTRP3, and flow cytometry showed significantly decreased apoptotic cells upon CTRP3 treatment (treated cells, 8.34±1.175 vs. controls, 20.163±0.35) (P < 0.01). Moreover, flow cytometry analysis also showed a significant decrease of cells in the G1 phase and an increase of cells in the S and G2 phase upon CTRP3 treatment (treated cells, 42.85±1.40 vs. control, 52.77±0.90; 28.41±0.57 vs. 23.49±1.13; 27.08±1.97 vs. 22.20±1.32, respectively) (all P < 0.05). Two-dimensional gel electrophoresis and mass spectrometry identified differentially expressed proteins, including cytokeratin-19, GLRX3 and DDAH1, which were upregulated in CTRP3 treated cells, and cytokeratin-17 and 14-3-3 sigma, which were downregulated. GLRX3, DDAH1 and 14-3-3 sigma were confirmed using western blot analysis. A PKC inhibitor, staurosporine, was used to inhibit PKC activity in CTRP3 treated RWPE-1 cells. Staurosporine completely abolished the CTRP3-induced increased phosphorylation of intracellular PKC substrates and CTRP3-stimulated effect by RWPE-1 cells. Our results provide the first evidence for a physiological role of the novel adipokine, CTRP3, in prostate cells. Our findings suggest that CTRP3 could improve proliferation and anti-apoptosis of prostate cells through protein kinase C signaling pathways.
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Affiliation(s)
- Qi Hou
- Department of Urology, Longgang District Central Hospital, Shenzhen, China
| | - Jinyan Lin
- Health management center, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Wentao Huang
- Department of Urology, Third Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Maoyin Li
- Department of Urology, Third Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Jianhua Feng
- Department of Urology, Longgang District Central Hospital, Shenzhen, China
- * E-mail: (JF); (XM)
| | - Xiangming Mao
- Department of Urology, Peking University Shenzhen Hospital, Shenzhen, China
- * E-mail: (JF); (XM)
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Wu D, Lei H, Wang JY, Zhang CL, Feng H, Fu FY, Li L, Wu LL. CTRP3 attenuates post-infarct cardiac fibrosis by targeting Smad3 activation and inhibiting myofibroblast differentiation. J Mol Med (Berl) 2015; 93:1311-25. [PMID: 26138247 DOI: 10.1007/s00109-015-1309-8] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 05/31/2015] [Accepted: 06/03/2015] [Indexed: 01/19/2023]
Abstract
UNLABELLED C1q/tumor necrosis factor-related protein-3 (CTRP3) is a novel adipokine with modulation effects on metabolism, inflammation, and cardiovascular system. This study aimed to investigate the effect of CTRP3 on cardiac fibrosis and its underlying mechanism. The myocardial expression of CTRP3 was significantly decreased after myocardial infarction (MI). Adenovirus-delivered CTRP3 supplement attenuated myocardial hypertrophy, improved cardiac function, inhibited interstitial fibrosis, and decreased the number of myofibroblasts post-MI. In cultured adult rat cardiac fibroblasts (CFs), CTRP3 attenuated cell proliferation; migration; and the expression of connective tissue growth factor, collagen I, and collagen III induced by transforming growth factor (TGF)-β1. Moreover, CTRP3 inhibited whereas CTRP3 small interfering RNA (siRNA) facilitated the expression of α-SMA and profibrotic molecules induced by TGF-β1. CTRP3 also attenuated TGF-β1-induced Smad3 phosphorylation, nuclear translocation, and interaction with p300. CTRP3 increased the phosphorylation of AMP-activated protein kinase (AMPK) and Akt in both rat hearts and CFs. Adenine 9-β-D-arabinofuranoside (AraA), an AMPK inhibitor, abolished the protective effect of CTRP3 against TGF-β1-induced profibrotic response and Smad3 activation. Taken together, CTRP3 attenuates cardiac fibrosis by inhibiting myofibroblast differentiation and the subsequent extracellular matrix production. AMPK is required for the anti-fibrotic effect of CTRP3 through targeting Smad3 activation and inhibiting myofibroblast differentiation. KEY MESSAGE CTRP3 alleviates cardiac fibrosis in a rat post-MI model and in cardiac fibroblasts. CTRP3 inhibits fibroblast-to-myofibroblast differentiation. CTRP3 exerts anti-fibrotic effect through targeting Smad3 activation. AMPK mediates the anti-fibrotic effect of CTRP3 by inhibition of Smad3 activation.
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Affiliation(s)
- Dan Wu
- Department of Physiology and Pathophysiology, Peking University Health Science Center, and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Hong Lei
- Department of Physiology and Pathophysiology, Peking University Health Science Center, and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Jin-Yu Wang
- Department of Physiology and Pathophysiology, Peking University Health Science Center, and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Cheng-Lin Zhang
- Department of Physiology and Pathophysiology, Peking University Health Science Center, and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Han Feng
- Department of Physiology and Pathophysiology, Peking University Health Science Center, and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Feng-Ying Fu
- Department of Physiology and Pathophysiology, Peking University Health Science Center, and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Li Li
- Department of Physiology and Pathophysiology, Peking University Health Science Center, and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China.
| | - Li-Ling Wu
- Department of Physiology and Pathophysiology, Peking University Health Science Center, and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China.
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Abstract
Maintaining proper energy balance in mammals entails intimate crosstalk between various tissues and organs. These inter-organ communications are mediated, to a great extent, by secreted hormones that circulate in blood. Regulation of the complex metabolic networks by secreted hormones (e.g., insulin, glucagon, leptin, adiponectin, FGF21) constitutes an important mechanism governing the integrated control of whole-body metabolism. Disruption of hormone-mediated metabolic circuits frequently results in dysregulated energy metabolism and pathology. As part of an effort to identify novel metabolic hormones, we recently characterized a highly conserved family of 15 secreted proteins, the C1q/TNF-related proteins (CTRP1-15). While related to adiponectin in sequence and structural organization, each CTRP has its own unique tissue expression profile and non-redundant function in regulating sugar and/or fat metabolism. Here, we summarize the current understanding of the physiological functions of CTRPs, emphasizing their metabolic roles. Future studies using gain-of-function and loss-of-function mouse models will provide greater mechanistic insights into the critical role CTRPs play in regulating systemic energy homeostasis.
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Affiliation(s)
- Marcus M Seldin
- Department of Physiology and Center for Metabolism and Obesity Research, The Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
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11
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Hou M, Liu J, Liu F, Liu K, Yu B. C1q tumor necrosis factor-related protein-3 protects mesenchymal stem cells against hypoxia- and serum deprivation-induced apoptosis through the phosphoinositide 3-kinase/Akt pathway. Int J Mol Med 2013; 33:97-104. [PMID: 24212403 DOI: 10.3892/ijmm.2013.1550] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 10/24/2013] [Indexed: 11/06/2022] Open
Abstract
Bone marrow (BM)-derived mesenchymal stem cells (MSCs) represent the leading candidate cell for tissue regeneration in the ischemic myocardium. However, the poor survival of stem cells transplanted into the ischemic myocardium presents a major obstacle in stem cell-based therapy. C1q tumor necrosis factor-related protein 3 (CTRP3) is a newly identified adipokine, similar to adiponectin, with beneficial effects on metabolic regulation. It has been shown to enhance the survival of cardiomyocytes during ischemia, while its expression is reduced following ischemia. In the present study, we examined the hypothesis that CTRP3 may enhance the survival of MSCs during exposure to hypoxia/serum deprivation (SD), and attempted to elucidate the underlying mechanisms. MSCs were obtained from rat bone marrow and cultured. Apoptosis was induced by hypoxia/SD for up to 24 h and the apoptotic rates were assessed by flow cytometry. MSC proliferation was measured using a Cell Counting kit-8 assay. The expression levels of Akt, Bcl-2, Bax, cytochrome c and cleaved caspase-3 were detected by western blot analysis. Mitochondrial membrane potential was examined using a membrane-permeable dye. CTRP3 significantly reduced hypoxia/SD-induced apoptosis in a concentration-dependent manner. The hypoxia/SD-induced decrease in the Bcl-2/Bax ratio and the mitochondrial membrane potential, and the increase in cytochrome c and caspase-3 levels were largely reversed by CTRP3. The anti-apoptotic effects of CTRP3 were blocked by inhibiting the activation of phosphoinositide 3-kinase (PI3K)/Akt signaling pathway with the PI3K inhibitor, LY294002. In conclusion, CTRP3 is a novel anti-apoptotic adipokine that protects MSCs from hypoxia/SD-induced apoptosis through the PI3K/Akt signaling pathway.
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Affiliation(s)
- Meng Hou
- The Key Laboratory of Myocardial Ischemia, Harbin Medical University, Ministry of Education, Heilongjiang Province, P.R. China
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12
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Peterson JM, Seldin MM, Wei Z, Aja S, Wong GW. CTRP3 attenuates diet-induced hepatic steatosis by regulating triglyceride metabolism. Am J Physiol Gastrointest Liver Physiol 2013; 305:G214-24. [PMID: 23744740 PMCID: PMC3742855 DOI: 10.1152/ajpgi.00102.2013] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
CTRP3 is a secreted plasma protein of the C1q family that helps regulate hepatic gluconeogenesis and is downregulated in a diet-induced obese state. However, the role of CTRP3 in regulating lipid metabolism has not been established. Here, we used a transgenic mouse model to address the potential function of CTRP3 in ameliorating high-fat diet-induced metabolic stress. Both transgenic and wild-type mice fed a high-fat diet showed similar body weight gain, food intake, and energy expenditure. Despite similar adiposity to wild-type mice upon diet-induced obesity (DIO), CTRP3 transgenic mice were strikingly resistant to the development of hepatic steatosis, had reduced serum TNF-α levels, and demonstrated a modest improvement in systemic insulin sensitivity. Additionally, reduced hepatic triglyceride levels were due to decreased expression of enzymes (GPAT, AGPAT, and DGAT) involved in triglyceride synthesis. Importantly, short-term daily administration of recombinant CTRP3 to DIO mice for 5 days was sufficient to improve the fatty liver phenotype, evident as reduced hepatic triglyceride content and expression of triglyceride synthesis genes. Consistent with a direct effect on liver cells, recombinant CTRP3 treatment reduced fatty acid synthesis and neutral lipid accumulation in cultured rat H4IIE hepatocytes. Together, these results establish a novel role for CTRP3 hormone in regulating hepatic lipid metabolism and highlight its protective function and therapeutic potential in attenuating hepatic steatosis.
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Affiliation(s)
- Jonathan M. Peterson
- 1Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland; ,3Center for Metabolism and Obesity Research, Johns Hopkins University School of Medicine, Baltimore, Maryland; and ,4Department of Health Sciences, School of Public Health, East Tennessee State University, Johnson City, Tennessee
| | - Marcus M. Seldin
- 1Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland; ,3Center for Metabolism and Obesity Research, Johns Hopkins University School of Medicine, Baltimore, Maryland; and
| | - Zhikui Wei
- 1Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland; ,3Center for Metabolism and Obesity Research, Johns Hopkins University School of Medicine, Baltimore, Maryland; and
| | - Susan Aja
- 2Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland; ,3Center for Metabolism and Obesity Research, Johns Hopkins University School of Medicine, Baltimore, Maryland; and
| | - G. William Wong
- 1Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland; ,3Center for Metabolism and Obesity Research, Johns Hopkins University School of Medicine, Baltimore, Maryland; and
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13
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Kim MJ, Park EJ, Lee W, Kim JE, Park SY. Regulation of the transcriptional activation of CTRP3 in chondrocytes by c-Jun. Mol Cell Biochem 2012; 368:111-7. [DOI: 10.1007/s11010-012-1349-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Accepted: 05/16/2012] [Indexed: 11/25/2022]
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14
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Schäffler A, Buechler C. CTRP family: linking immunity to metabolism. Trends Endocrinol Metab 2012; 23:194-204. [PMID: 22261190 DOI: 10.1016/j.tem.2011.12.003] [Citation(s) in RCA: 246] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 12/09/2011] [Accepted: 12/13/2011] [Indexed: 01/22/2023]
Abstract
It is well known that infectious and inflammatory diseases such as sepsis and severe inflammatory response syndrome are accompanied by metabolic alterations such as insulin resistance. Conversely, metabolic diseases such as visceral obesity and type 2 diabetes are characterized by high levels of proinflammatory cytokines. Metabolism and immunity are linked by proteins of dual function. Adiponectin, a member of the C1q/TNF-related protein (CTRP) family, has attracted much interest because of its anti-inflammatory and insulin-sensitizing effects. To date, 15 additional CTRP family members have been identified that might also play a role in metabolism and immunity. This review focuses on the biochemistry and pleiotropic physiological functions of CTRPs as new molecular mediators connecting inflammatory and metabolic diseases.
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Affiliation(s)
- Andreas Schäffler
- Department of Internal Medicine I, Regensburg University Medical Center, D-93042 Regensburg, Germany.
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15
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Hofmann C, Chen N, Obermeier F, Paul G, Büchler C, Kopp A, Falk W, Schäffler A. C1q/TNF-related protein-3 (CTRP-3) is secreted by visceral adipose tissue and exerts antiinflammatory and antifibrotic effects in primary human colonic fibroblasts. Inflamm Bowel Dis 2011; 17:2462-71. [PMID: 21351204 DOI: 10.1002/ibd.21647] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2010] [Accepted: 12/31/2010] [Indexed: 12/13/2022]
Abstract
BACKGROUND The adipokine CTRP-3 (C1q/TNF-related protein-3) belongs to the C1q/TNF-related protein family which antagonizes the effects of lipopolysaccharide (LPS). The aim was to investigate the antiinflammatory and antifibrotic role of CTRP-3 in Crohn's disease (CD). METHODS Mesenteric adipose tissue (MAT) of patients with CD or colonic cancer (CC) was resected. Human primary colonic lamina propria fibroblasts (CLPF) were isolated from controls and CD patients. Concentrations of chemokines and cytokines in the supernatants were measured by enzyme-linked immunosorbent assay (ELISA). Expression of connective tissue growth factor (CTGF), collagen I, and collagen III was analyzed by real-time polymerase chain reaction (PCR). Recombinant CTRP-3 expressed in insect cells was used for stimulation experiments. RESULTS CTRP-3 is synthesized and secreted by MAT resected from patients with CD, ulcerative colitis (UC), CC, and sigma diverticulitis as well as by murine and human mature adipocytes. CTRP-3 had no effect on the basal secretion of MCSF, MIF, or RANTES in MAT of CD and control patients. LPS-stimulation (10 ng/mL) significantly increased IL-8 release in CLPF of CD patients and, to a lesser extent, in cells of controls and of fibrotic CD tissue. CTRP-3 significantly and dose-dependently reduced LPS-induced IL-8 secretion in CLPF within 8 hours after LPS exposure, whereas LPS-induced IL-6 and TNF release was not affected. CTRP-3 inhibited TGF-β production and the expression of CTGF and collagen I in CLPF, whereas collagen III expression remained unchanged. CONCLUSIONS CTRP-3 exerts potent antiinflammatory and antifibrotic effects in CLPF by antagonizing the LPS pathway and by targeting the TGF-β-CTGF-collagen I pathway.
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Affiliation(s)
- Claudia Hofmann
- Department of Internal Medicine I, University Medical Center Regensburg, Germany.
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16
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Kudryavtseva E, Forde TS, Pucker AD, Adarichev VA. Wnt signaling genes of murine chromosome 15 are involved in sex-affected pathways of inflammatory arthritis. ACTA ACUST UNITED AC 2011; 64:1057-68. [PMID: 22005949 DOI: 10.1002/art.33414] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Sex disparities in rheumatoid arthritis (RA) are well documented despite the lack of any known major RA susceptibility genes mapped to sex chromosomes. Murine chromosome 15 carries the sex-affected Pgia8 locus that mediates proteoglycan-induced arthritis, and homologous human loci are associated with RA. This study was undertaken to identify genes/mechanisms implicated in sex disparities in arthritis. METHODS Gene expression analysis was performed using RNA isolated from the paws of male and female Pgia8-congenic mice with collagen antibody-induced arthritis. Results were corroborated by reverse transcription-polymerase chain reaction, and mice were also studied prior to disease onset. Ingenuity Pathways Analysis of the expression patterns and gene functions was used to discover locus-specific and sex-affected signature transcripts. RESULTS We found that the Pgia8 locus regulates antibody-mediated inflammatory arthritis differently in males and females. In Pgia8-congenic males, arthritis severity was 30% less (P < 0.005) than in wild-type males, but the antiinflammatory effect was similar in wild-type and congenic females. Transcriptome analysis indicated that 12 genes within the locus were significantly dysregulated in arthritic joints of congenic mice; expression of these genes was also sex specific. The genes that correlated most highly with arthritis severity included those for collagen triple-helix repeat-containing 1 (Cthrc1), metalloproteinase (Adamts12), R-spondin (Rspo2), and syndecan (Sdc2) (r = 0.87-0.91). The level of Cthrc1 message also correlated with that of the genes for the proinflammatory cytokines interleukin-1β and interleukin-6. CONCLUSION These results indicate that sex-specific disparities in RA are linked to transcriptional regulation of genes involved in cartilage degradation (Adamts12) and canonical and noncanonical Wnt signaling (Cthrc1, Rspo2, Sdc2).
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17
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Kopp A, Bala M, Buechler C, Falk W, Gross P, Neumeier M, Schölmerich J, Schäffler A. C1q/TNF-related protein-3 represents a novel and endogenous lipopolysaccharide antagonist of the adipose tissue. Endocrinology 2010; 151:5267-78. [PMID: 20739398 DOI: 10.1210/en.2010-0571] [Citation(s) in RCA: 127] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Proteins secreted by adipocytes (adipokines) play an important role in the pathophysiology of type 2 diabetes mellitus and the associated chronic and low-grade state of inflammation. It was the aim to characterize the antiinflammatory potential of the new adipocytokine, C1q/TNF-related protein-3 (CTRP-3), which shows structural homologies to the pleiotropic adipocytokine adiponectin. mRNA and protein expression of CTRP-3 was analyzed by RT-PCR and Western blot. Recombinant CTRP-3 and small interfering RNA-based strategies were used to investigate the effect of CTRP-3 on toll-like receptor (TLR) ligand, lipopolysaccharide (LPS)-, and lauric acid-induced chemokine release of monocytes and adipocytes. Together with complex ELISA-based techniques, a designed TLR4/myeloid differentiation protein-2 fusion molecule shown to bind LPS was used to prove the ability of CTRP-3 to act as endogenous LPS antagonist. CTRP-3 is synthesized in monocytes and adipocytes. The recombinant protein dose-dependently inhibits the release of chemokines in monocytes and adipocytes that were induced by lauric acid, LPS, and other TLR ligands in vitro and ex vivo. CTRP-3 inhibits monocyte chemoattractant protein-1 release in adipocytes, whereas small interfering RNA-mediated knockdown of CTRP-3 up-regulates monocyte chemoattractant protein-1 release, reduces lipid droplet size, and decreases intracellular triglyceride concentration in adipocytes, causing a dedifferentiation into a more proinflammatory and immature phenotype. By using a designed TLR4/MD-2 fusion molecule, it is shown by different techniques that CTRP-3 specifically and effectively inhibits the binding of LPS to its receptor, TLR4/MD-2. CTRP-3 inhibits three basic and common proinflammatory pathways involved in obesity and type 2 diabetes mellitus (adipo-inflammation) by acting as an endogenous LPS antagonist of the adipose tissue.
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Affiliation(s)
- Andrea Kopp
- Department of Internal Medicine I, University of Regensburg, D-93042 Regensburg, Germany
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18
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Wiest R, Leidl F, Kopp A, Weigert J, Neumeier M, Buechler C, Schoelmerich J, Schäffler A. Peritoneal fluid adipokines: ready for prime time? Eur J Clin Invest 2009; 39:219-29. [PMID: 19260952 DOI: 10.1111/j.1365-2362.2009.02085.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Visceral adipose tissues secret a variety of adipokines; however, it is not known whether they are present in the peritoneal fluid. It was the aim of this study to investigate peritoneal fluid concentrations of novel (cartonectin, omentin) and classical adipokines (leptin, adiponectin, resistin, visfatin) in patients with ascites. MATERIAL AND METHODS Ninety-six patients (71 men and 25 women) undergoing paracentesis were included. Of these, 76 suffered from liver cirrhosis. Adipokines were measured by enzyme-linked immunosorbent assay or Western blot. RESULTS Each adipokine was detected in ascites with a broad range. Serum-ascites ratios (SAR) correlated with clinical and laboratory parameters. The main variables influencing peritoneal fluid adipokine concentrations were body mass index (BMI), local inflammation, systemic inflammation and serum adipokine concentrations. Resistin was significantly higher in patients with peritonitis and showed a positive correlation with peripheral leucocytes (white blood cell count). Leptin was correlated with the underlying disease. Visfatin correlated with peripheral white blood cell and C-reactive protein levels. Omentin expression was correlated with ascitic leucocyte count, ascitic albumin concentration and low albumin SAR. BMI was correlated positively with ascitic leptin levels and cartonectin protein levels. CONCLUSIONS Peritoneal fluid adipokine concentrations are characterized by individual SARs, depend on the presence of peritonitis, and correlate with underlying disease, BMI and systemic inflammation. The data open a new field of research on the role of the peritoneum and visceral adipokines in gastrointestinal diseases.
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Affiliation(s)
- R Wiest
- Regensburg University Hospital, Regensburg, Germany
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19
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Wölfing B, Buechler C, Weigert J, Neumeier M, Aslanidis C, Schöelmerich J, Schäffler A. Effects of the new C1q/TNF-related protein (CTRP-3) "cartonectin" on the adipocytic secretion of adipokines. Obesity (Silver Spring) 2008; 16:1481-6. [PMID: 18421280 DOI: 10.1038/oby.2008.206] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Cartonectin (collagenous repeat-containing sequence of 26-kDa protein; CORS-26) was described as a new adipokine of the C1q/TNF molecular superfamily C1q/TNF-related protein-3 (CTRP-3), secreted by the adipocytes of mice and humans. The receptor and function of cartonectin are unknown and the recombinant protein is not commercially available. OBJECTIVE To investigate the effects of recombinant cartonectin on the secretion of adipokines such as adiponectin, leptin, and resistin from adipocytes of human and murine origin. The effect of the BMI of the adipocyte donor was also investigated. METHODS AND PROCEDURES Human adipocytes from pooled lean and preobese healthy individuals and murine 3T3-L1 adipocytes were used for stimulation experiments. Recombinant cartonectin was expressed in insect H5 cells. Adipokine secretion was measured using enzyme-linked immunosorbent assay. In addition, western blot analysis and luciferase reporter gene assays were employed. RESULTS Cartonectin (1, 10, 50, and 250 ng/ml) in higher doses stimulates the secretion of adiponectin and resistin from murine adipocytes. This effect is not caused by an induction of peroxisome proliferator-activated receptor-gamma (PPAR-gamma) protein expression, as confirmed by western blot analysis. Also, luciferase reporter gene assay revealed that cartonectin failed to induce luciferase activity at the peroxisome proliferator-activated receptor responsive element site containing the adiponectin/luciferase promoter fragment. Human adipocytes from lean individuals secrete higher amounts of adiponectin and leptin when compared with adipocytes of individuals with a preobesity BMI (25-30 kg/m(2)). Cartonectin failed to stimulate adiponectin or leptin secretion from human adipocytes, irrespective of the BMI value. DISCUSSION Cartonectin is a new adipokine that differentially regulates the secretion of classical adipokines, with marked differences between the human and the murine systems. These effects are species-dependent, while basal adipokine secretion is influenced by the BMI.
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Affiliation(s)
- Britta Wölfing
- Department of Internal Medicine I, University of Regensburg, Regensburg, Germany
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20
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Schäffler A, Schölmerich J, Salzberger B. Adipose tissue as an immunological organ: Toll-like receptors, C1q/TNFs and CTRPs. Trends Immunol 2007; 28:393-9. [PMID: 17681884 DOI: 10.1016/j.it.2007.07.003] [Citation(s) in RCA: 170] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2007] [Revised: 06/14/2007] [Accepted: 07/18/2007] [Indexed: 01/07/2023]
Abstract
Adipose tissue has long been regarded as a mostly resting tissue that is dedicated solely to energy storage and release. However, in recent years, this view has changed dramatically following new insights into the metabolic and immunological functions of preadipocytes and adipocytes. There are several lines of evidence for the involvement of adipose tissue in innate and acquired immune responses. First, adipocytes are potent producers of proinflammatory cytokines, such as interleukin-6 and tumor necrosis factor (TNF), and chemokines. Furthermore, adipocytes secrete high amounts of adipokines, such as leptin, adiponectin and resistin, that regulate monocyte/macrophage function, and also secrete molecules associated with the innate immune system, such as the C1qTNF-related protein superfamily. Finally, preadipocytes and adipocytes express a broad spectrum of functional Toll-like receptors and the former can convert into macrophage-like cells. Collectively, these data clearly establish the role of adipose tissue as a new member of the immune system.
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Affiliation(s)
- A Schäffler
- Department of Internal Medicine I, University of Regensburg, D-93042 Regensburg, Germany.
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21
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Ghai R, Waters P, Roumenina LT, Gadjeva M, Kojouharova MS, Reid KBM, Sim RB, Kishore U. C1q and its growing family. Immunobiology 2007; 212:253-66. [PMID: 17544811 DOI: 10.1016/j.imbio.2006.11.001] [Citation(s) in RCA: 150] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2006] [Accepted: 11/01/2006] [Indexed: 11/18/2022]
Abstract
C1q is the target recognition protein of the classical complement pathway and a major connecting link between innate and acquired immunity. As a charge pattern recognition molecule of innate immunity, C1q can engage a broad range of self and non-self ligands via its heterotrimeric globular (gC1q) domain and thus trigger the classical pathway. The trimeric gC1q signature domain has been identified in a variety of non-complement proteins that can be grouped together as a C1q family. The X-ray crystal structures of the gC1q domain of a few members of the C1q family reveal a compact jelly-roll beta-sandwich fold similar to that of the multifunctional tumor necrosis factor (TNF) ligand family, hence the C1q and TNF superfamily. This review is an update on the structural and functional aspects of the gC1q domain of human C1q. We also mention the diverse range of proteins that utilize a gC1q domain in order to reflect on its importance as a versatile scaffold to support a variety of functions.
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Affiliation(s)
- Rohit Ghai
- Institute of Medical Microbiology, Justus-Liebig-University, Frankfurter Strasse 107, 35392 Giessen, Germany
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22
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Schäffler A, Weigert J, Neumeier M, Schölmerich J, Buechler C. Regulation and function of collagenous repeat containing sequence of 26-kDa protein gene product "cartonectin". Obesity (Silver Spring) 2007; 15:303-13. [PMID: 17299102 DOI: 10.1038/oby.2007.566] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE Collagenous repeat containing sequence of 26-kDa protein (CORS-26) was identified as a new gene transcript expressed in cartilage with unknown function. It was the aim of this study to investigate expression, regulation, and function of CORS-26 in adipocytes. RESEARCH METHODS AND PROCEDURES CORS-26 mRNA and protein expression was studied by reverse transcriptase-polymerase chain reaction, Western blot analysis, and quantitative real-time polymerase chain reaction. Transcriptional regulation was studied by electrophoretic mobility shift assay and luciferase reporter gene assay. The adipocytic secretion of adiponectin and resistin was measured by enzyme-linked immunosorbent assay. RESULTS CORS-26 mRNA is absent in 3T3-L1 preadipocytes and adipocytes after 48 hours of differentiation. CORS-26 mRNA was induced from Day 4 to Day 9 of adipocyte differentiation. CORS-26 protein was induced in mature adipocytes. Peroxisome proliferator-activated receptor (PPAR) gamma (but not PPARalpha) in nuclear extracts prepared from adipocytes was shown to bind specifically to a putative peroxisome proliferator response element-one-half-site located at -641/-596 bp. Increasing doses of the ligands troglitazone (1, 10, 20 microM) and fenofibrate (50, 100, 200 microM) but not 15-deoxy-prostaglandin (J(2)) (0.5, 1.0, 2.5 microM) resulted in a significant reduction of both promoter activity and the amount of mRNA expression. Recombinant CORS-26 significantly stimulated the adipocytic secretion of adiponectin and resistin in a dose-dependent manner. DISCUSSION The mRNA and protein expression profile puts CORS-26 in the adipocytokine family. Cartonectin is negatively regulated by exogenous, but not endogenous, PPARgamma ligands. Because CORS-26 up-regulates adipokine secretion, it might be involved in metabolic and immunologic pathways.
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Affiliation(s)
- Andréas Schäffler
- Department of Internal Medicine I, University of Regensburg, D-93042 Regensburg, Germany.
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Schäffler A, Müller-Ladner U, Schölmerich J, Büchler C. Role of adipose tissue as an inflammatory organ in human diseases. Endocr Rev 2006; 27:449-67. [PMID: 16684901 DOI: 10.1210/er.2005-0022] [Citation(s) in RCA: 153] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Reviews on the inflammatory role of adipose tissue outside the field of metabolism are rare. There is increasing evidence provided by numerous basic research studies from nearly all internal medicine subspecializations that adipocytes and adipocytokines are involved in primary inflammatory processes and diseases. Therefore, it is the aim of the present review to discuss and to summarize the current knowledge on the inflammatory role of adipocytokines and special types of regional adipocytes such as retroorbital, synovial, visceral, subdermal, peritoneal, and bone marrow adipocytes in internal medicine diseases. Future clinical and therapeutic implications are discussed.
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Affiliation(s)
- A Schäffler
- Department of Internal Medicine I, University of Regensburg, Germany.
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Weigert J, Neumeier M, Schäffler A, Fleck M, Schölmerich J, Schütz C, Buechler C. The adiponectin paralog CORS-26 has anti-inflammatory properties and is produced by human monocytic cells. FEBS Lett 2005; 579:5565-70. [PMID: 16213490 DOI: 10.1016/j.febslet.2005.09.022] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2005] [Revised: 09/12/2005] [Accepted: 09/14/2005] [Indexed: 12/15/2022]
Abstract
The adiponectin paralog CORS-26 (collagenous repeat-containing sequence of 26kDa protein) is a member of the C1q/TNF-alpha molecular superfamily. CORS-26 is a secreted protein and baculovirus-produced CORS-26 released in the supernatant of insect cells forms stable trimers. Adiponectin exerts anti-inflammatory effects in LPS-treated monocytic cells and CORS-26 also reduces IL-6 and TNF-alpha secretion but does not increase IL-10. Suppression of NFkappaB signalling may explain the anti-inflammatory actions of CORS-26. Furthermore CORS-26 protein was detected in human monocytic and dendritic cells. The present data demonstrate for the first time that CORS-26 forms trimers, exerts anti-inflammatory properties and that it is expressed in monocytic cells. Therefore CORS-26 may provide a new target for pharmacological drugs in inflammatory diseases like the metabolic syndrome.
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Affiliation(s)
- Johanna Weigert
- Department of Internal Medicine I, University of Regensburg, Germany
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Kishore U, Ghai R, Greenhough TJ, Shrive AK, Bonifati DM, Gadjeva MG, Waters P, Kojouharova MS, Chakraborty T, Agrawal A. Structural and functional anatomy of the globular domain of complement protein C1q. Immunol Lett 2005; 95:113-28. [PMID: 15388251 PMCID: PMC3818097 DOI: 10.1016/j.imlet.2004.06.015] [Citation(s) in RCA: 141] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2004] [Accepted: 06/23/2004] [Indexed: 02/06/2023]
Abstract
C1q is the first subcomponent of the classical pathway of the complement system and a major connecting link between innate and acquired immunity. As a versatile charge pattern recognition molecule, C1q is capable of engaging a broad range of ligands via its heterotrimeric globular domain (gC1q) which is composed of the C-terminal regions of its A (ghA), B (ghB) and C (ghC) chains. Recent studies using recombinant forms of ghA, ghB and ghC have suggested that the gC1q domain has a modular organization and each chain can have differential ligand specificity. The crystal structure of the gC1q, molecular modeling and protein engineering studies have combined to illustrate how modular organization, charge distribution and the spatial orientation of the heterotrimeric assembly offer versatility of ligand recognition to C1q. Although the biochemical and structural studies have provided novel insights into the structure-function relationships within the gC1q domain, they have also raised many unexpected issues for debate.
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Affiliation(s)
- Uday Kishore
- Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK.
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Kishore U, Gaboriaud C, Waters P, Shrive AK, Greenhough TJ, Reid KB, Sim RB, Arlaud GJ. C1q and tumor necrosis factor superfamily: modularity and versatility. Trends Immunol 2004; 25:551-61. [DOI: 10.1016/j.it.2004.08.006] [Citation(s) in RCA: 354] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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