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Zegeye MM, Nakka SS, Andersson JSO, Söderberg S, Ljungberg LU, Kumawat AK, Sirsjö A. Soluble LDL-receptor is induced by TNF-α and inhibits hepatocytic clearance of LDL-cholesterol. J Mol Med (Berl) 2023; 101:1615-1626. [PMID: 37861809 PMCID: PMC10697900 DOI: 10.1007/s00109-023-02379-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/18/2023] [Accepted: 09/18/2023] [Indexed: 10/21/2023]
Abstract
Defective LDL-C clearance and hence its elevation in the circulation is an established risk factor for cardiovascular diseases (CVDs) such as myocardial infarction (MI). A soluble LDL-receptor (sLDL-R) has been detected in human plasma which correlates strongly with circulating LDL-C and classical conditions that promote chronic inflammation. However, the mechanistic interplay between sLDL-R, inflammation, and CVDs remains to be investigated. Here, we report that stimulation of HepG2 cells with TNF-α induces the release of sLDL-R into culture supernatants. In addition, TNF-α induces gene expression of peptidases ADAM-17 and MMP-14 in HepG2 cells, and inhibiting these peptidases using TMI 1 significantly reduces the TNF-α induced sLDL-R release. We found that a soluble form of recombinant LDL-R (100 nM) can strongly bind to LDL-C and form a stable complex (KD = E-12). Moreover, incubation of HepG2 cells with this recombinant LDL-R resulted in reduced LDL-C uptake in a dose-dependent manner. In a nested case-control study, we found that baseline sLDL-R in plasma is positively correlated with plasma total cholesterol level. Furthermore, a twofold increase in plasma sLDL-R was associated with a 55% increase in the risk of future MI [AOR = 1.55 (95% CI = 1.10-2.18)]. Nevertheless, mediation analyses revealed that a significant proportion of the association is mediated by elevation in plasma cholesterol level (indirect effect β = 0.21 (95% CI = 0.07-0.38). Collectively, our study shows that sLDL-R is induced by a pro-inflammatory cytokine TNF-α via membrane shedding. Furthermore, an increase in sLDL-R could inhibit hepatic clearance of LDL-C increasing its half-life in the circulation and contributing to the pathogenesis of MI. KEY MESSAGES: TNF-α causes shedding of hepatocytic LDL-R through induction of ADAM-17 and MMP-14. sLDL-R binds strongly to LDL-C and inhibits its uptake by hepatocytic cells. Plasma sLDL-R is positively correlated with TNF-α and cholesterol. Plasma sLDL-R is an independent predictor of myocardial infarction (MI). Plasma cholesterol mediates the association between sLDL-R and MI.
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Affiliation(s)
- Mulugeta M Zegeye
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University Södra Grev, Rosengatan 32, 703 62, Örebro, Sweden.
| | - Sravya S Nakka
- Department of Infectious Diseases, Sahlgrenska University Hospital, Region Västra Götaland, Gothenburg, Sweden
| | - Jonas S O Andersson
- Department of Public Health and Clinical Medicine, Skellefteå Research Unit, Umeå University, 931 86, Skellefteå, Sweden
| | - Stefan Söderberg
- Department of Public Health and Clinical Medicine, Medicine Unit, Umeå University, Umeå, Sweden
| | - Liza U Ljungberg
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University Södra Grev, Rosengatan 32, 703 62, Örebro, Sweden
| | - Ashok K Kumawat
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University Södra Grev, Rosengatan 32, 703 62, Örebro, Sweden
| | - Allan Sirsjö
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University Södra Grev, Rosengatan 32, 703 62, Örebro, Sweden
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Zegeye MM, Matic L, Lengquist M, Hayderi A, Grenegård M, Hedin U, Sirsjö A, Ljungberg LU, Kumawat AK. Interleukin-6 trans-signaling induced laminin switch contributes to reduced trans-endothelial migration of granulocytic cells. Atherosclerosis 2023; 371:41-53. [PMID: 36996622 DOI: 10.1016/j.atherosclerosis.2023.03.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 02/20/2023] [Accepted: 03/15/2023] [Indexed: 04/01/2023]
Abstract
BACKGROUND AND AIMS Laminins are essential components of the endothelial basement membrane, which predominantly contains LN421 and LN521 isoforms. Regulation of laminin expression under pathophysiological conditions is largely unknown. In this study, we aimed to investigate the role of IL-6 in regulating endothelial laminin profile and characterize the impact of altered laminin composition on the phenotype, inflammatory response, and function of endothelial cells (ECs). METHODS HUVECs and HAECs were used for in vitro experiments. Trans-well migration experiments were performed using leukocytes isolated from peripheral blood of healthy donors. The BiKE cohort was used to assess expression of laminins in atherosclerotic plaques and healthy vessels. Gene and protein expression was analyzed using Microarray/qPCR and proximity extension assay, ELISA, immunostaining or immunoblotting techniques, respectively. RESULTS Stimulation of ECs with IL-6+sIL-6R, but not IL-6 alone, reduces expression of laminin α4 (LAMA4) and increases laminin α5 (LAMA5) expression at the mRNA and protein levels. In addition, IL-6+sIL-6R stimulation of ECs differentially regulates the release of several proteins including CXCL8 and CXCL10, which collectively were predicted to inhibit granulocyte transmigration. Experimentally, we demonstrated that granulocyte migration is inhibited across ECs pre-treated with IL-6+sIL-6R. In addition, granulocyte migration across ECs cultured on LN521 was significantly lower compared to LN421. In human atherosclerotic plaques, expression of endothelial LAMA4 and LAMA5 is significantly lower compared to control vessels. Moreover, LAMA5-to-LAMA4 expression ratio was negatively correlated with granulocytic cell markers (CD177 and myeloperoxidase (MPO)) and positively correlated with T-lymphocyte marker CD3. CONCLUSIONS We showed that expression of endothelial laminin alpha chains is regulated by IL-6 trans-signaling and contributes to inhibition of trans-endothelial migration of granulocytic cells. Further, expression of laminin alpha chains is altered in human atherosclerotic plaques and is related to intra-plaque abundance of leukocyte subpopulations.
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Affiliation(s)
- Mulugeta M Zegeye
- School of Medical Sciences, Örebro University, Örebro, Sweden; Cardiovascular Research Centre (CVRC), School of Medical Sciences, Örebro University, Örebro, Sweden.
| | - Ljubica Matic
- Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden
| | - Mariette Lengquist
- Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden
| | - Assim Hayderi
- School of Medical Sciences, Örebro University, Örebro, Sweden; Cardiovascular Research Centre (CVRC), School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Magnus Grenegård
- School of Medical Sciences, Örebro University, Örebro, Sweden; Cardiovascular Research Centre (CVRC), School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Ulf Hedin
- Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden
| | - Allan Sirsjö
- School of Medical Sciences, Örebro University, Örebro, Sweden; Cardiovascular Research Centre (CVRC), School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Liza U Ljungberg
- School of Medical Sciences, Örebro University, Örebro, Sweden; Cardiovascular Research Centre (CVRC), School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Ashok K Kumawat
- School of Medical Sciences, Örebro University, Örebro, Sweden; Cardiovascular Research Centre (CVRC), School of Medical Sciences, Örebro University, Örebro, Sweden
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Kumawat AK, Zegeye MM, Paramel GV, Baumgartner R, Gisterå A, Amegavie O, Hellberg S, Jin H, Caravaca AS, Söderström LÅ, Gudmundsdotter L, Frejd FY, Ljungberg LU, Olofsson PS, Ketelhuth DFJ, Sirsjö A. Inhibition of IL17A Using an Affibody Molecule Attenuates Inflammation in ApoE-Deficient Mice. Front Cardiovasc Med 2022; 9:831039. [PMID: 35282365 PMCID: PMC8907570 DOI: 10.3389/fcvm.2022.831039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 01/31/2022] [Indexed: 11/15/2022] Open
Abstract
The balance between pro- and anti-inflammatory cytokines released by immune and non-immune cells plays a decisive role in the progression of atherosclerosis. Interleukin (IL)-17A has been shown to accelerate atherosclerosis. In this study, we investigated the effect on pro-inflammatory mediators and atherosclerosis development of an Affibody molecule that targets IL17A. Affibody molecule neutralizing IL17A, or sham were administered in vitro to human aortic smooth muscle cells (HAoSMCs) and murine NIH/3T3 fibroblasts and in vivo to atherosclerosis-prone, hyperlipidaemic ApoE−/− mice. Levels of mediators of inflammation and development of atherosclerosis were compared between treatments. Exposure of human smooth muscle cells and murine NIH/3T3 fibroblasts in vitro to αIL-17A Affibody molecule markedly reduced IL6 and CXCL1 release in supernatants compared with sham exposure. Treatment of ApoE−/− mice with αIL-17A Affibody molecule significantly reduced plasma protein levels of CXCL1, CCL2, CCL3, HGF, PDGFB, MAP2K6, QDPR, and splenocyte mRNA levels of Ccxl1, Il6, and Ccl20 compared with sham exposure. There was no significant difference in atherosclerosis burden between the groups. In conclusion, administration of αIL17A Affibody molecule reduced levels of pro-inflammatory mediators and attenuated inflammation in ApoE−/− mice.
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Affiliation(s)
- Ashok Kumar Kumawat
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Orebro, Sweden
- *Correspondence: Ashok Kumar Kumawat
| | - Mulugeta M. Zegeye
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Orebro, Sweden
| | - Geena Varghese Paramel
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Orebro, Sweden
| | - Roland Baumgartner
- Division of Cardiovascular Medicine, Department of Medicine, Solna, Centre for Molecular Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Anton Gisterå
- Division of Cardiovascular Medicine, Department of Medicine, Solna, Centre for Molecular Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Obed Amegavie
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Orebro, Sweden
| | - Sanna Hellberg
- Division of Cardiovascular Medicine, Department of Medicine, Solna, Centre for Molecular Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Hong Jin
- Division of Cardiovascular Medicine, Department of Medicine, Solna, Centre for Molecular Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | - April S. Caravaca
- Division of Cardiovascular Medicine, Department of Medicine, Solna, Centre for Molecular Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Leif Å. Söderström
- Division of Cardiovascular Medicine, Department of Medicine, Solna, Centre for Molecular Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | | | | | - Liza U. Ljungberg
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Orebro, Sweden
| | - Peder S. Olofsson
- Division of Cardiovascular Medicine, Department of Medicine, Solna, Centre for Molecular Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Daniel F. J. Ketelhuth
- Division of Cardiovascular Medicine, Department of Medicine, Solna, Centre for Molecular Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Allan Sirsjö
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Orebro, Sweden
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Zegeye MM, Andersson JSO, Wennberg P, Repsilber D, Sirsjö A, Ljungberg LU. IL-6 as a Mediator of the Association Between Traditional Risk Factors and Future Myocardial Infarction: A Nested Case-Control Study. Arterioscler Thromb Vasc Biol 2021; 41:1570-1579. [PMID: 33657883 DOI: 10.1161/atvbaha.120.315793] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
[Figure: see text].
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Affiliation(s)
- Mulugeta M Zegeye
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Sweden (M.M.Z., D.R., A.S., L.U.L.)
| | - Jonas S O Andersson
- Skellefteå Research Unit, Department of Public Health and Clinical Medicine (J.S.O.A.), Umeå University, Sweden
| | - Patrik Wennberg
- Department of Public Health and Clinical Medicine, Family Medicine (P.W.), Umeå University, Sweden
| | - Dirk Repsilber
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Sweden (M.M.Z., D.R., A.S., L.U.L.)
| | - Allan Sirsjö
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Sweden (M.M.Z., D.R., A.S., L.U.L.)
| | - Liza U Ljungberg
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Sweden (M.M.Z., D.R., A.S., L.U.L.)
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Zegeye MM, Lindkvist M, Fälker K, Kumawat AK, Paramel G, Grenegård M, Sirsjö A, Ljungberg LU. Activation of the JAK/STAT3 and PI3K/AKT pathways are crucial for IL-6 trans-signaling-mediated pro-inflammatory response in human vascular endothelial cells. Cell Commun Signal 2018; 16:55. [PMID: 30185178 PMCID: PMC6125866 DOI: 10.1186/s12964-018-0268-4] [Citation(s) in RCA: 183] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 08/27/2018] [Indexed: 01/05/2023] Open
Abstract
Background IL-6 classic signaling is linked to anti-inflammatory functions while the trans-signaling is associated with pro-inflammatory responses. Classic signaling is induced via membrane-bound IL-6 receptor (IL-6R) whereas trans-signaling requires prior binding of IL-6 to the soluble IL-6R. In both cases, association with the signal transducing gp130 receptor is compulsory. However, differences in the downstream signaling mechanisms of IL-6 classic- versus trans-signaling remains largely elusive. Methods In this study, we used flow cytometry, quantitative PCR, ELISA and immuno-blotting techniques to investigate IL-6 classic and trans-signaling mechanisms in Human Umbilical Vein Endothelial Cells (HUVECs). Results We show that both IL-6R and gp130 are expressed on the surface of human vascular endothelial cells, and that the expression is affected by pro-inflammatory stimuli. In contrast to IL-6 classic signaling, IL-6 trans-signaling induces the release of the pro-inflammatory chemokine Monocyte Chemoattractant Protein-1 (MCP-1) from human vascular endothelial cells. In addition, we reveal that the classic signaling induces activation of the JAK/STAT3 pathway while trans-signaling also activates the PI3K/AKT and the MEK/ERK pathways. Furthermore, we demonstrate that MCP-1 induction by IL-6 trans-signaling requires simultaneous activation of the JAK/STAT3 and PI3K/AKT pathways. Conclusions Collectively, our study reports molecular differences in IL-6 classic- and trans-signaling in human vascular endothelial cells; and elucidates the pathways which mediate MCP-1 induction by IL-6 trans-signaling. Electronic supplementary material The online version of this article (10.1186/s12964-018-0268-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Mulugeta M Zegeye
- Cardiovascular Research Center, School of Medical Sciences, Örebro University Södra Grev Rosengatan 32, 703 62, Örebro, Sweden.
| | - Madelene Lindkvist
- Cardiovascular Research Center, School of Medical Sciences, Örebro University Södra Grev Rosengatan 32, 703 62, Örebro, Sweden
| | - Knut Fälker
- Cardiovascular Research Center, School of Medical Sciences, Örebro University Södra Grev Rosengatan 32, 703 62, Örebro, Sweden
| | - Ashok K Kumawat
- Cardiovascular Research Center, School of Medical Sciences, Örebro University Södra Grev Rosengatan 32, 703 62, Örebro, Sweden
| | - Geena Paramel
- Cardiovascular Research Center, School of Medical Sciences, Örebro University Södra Grev Rosengatan 32, 703 62, Örebro, Sweden.,Present address: Department of Biochemistry and Molecular Biology, Faculty of Medicine, Dalhousie University, Dalhousie Medicine New Brunswick, Saint John, NB, E2L 4L5, Canada
| | - Magnus Grenegård
- Cardiovascular Research Center, School of Medical Sciences, Örebro University Södra Grev Rosengatan 32, 703 62, Örebro, Sweden
| | - Allan Sirsjö
- Cardiovascular Research Center, School of Medical Sciences, Örebro University Södra Grev Rosengatan 32, 703 62, Örebro, Sweden
| | - Liza U Ljungberg
- Cardiovascular Research Center, School of Medical Sciences, Örebro University Södra Grev Rosengatan 32, 703 62, Örebro, Sweden
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