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Herrera GA, del Pozo-Yauner L, Teng J, Zeng C, Shen X, Moriyama T, Ramirez Alcantara V, Liu B, Turbat-Herrera EA. Glomerulopathic Light Chain-Mesangial Cell Interactions: Sortilin-Related Receptor (SORL1) and Signaling. Kidney Int Rep 2021; 6:1379-1396. [PMID: 34013116 PMCID: PMC8116754 DOI: 10.1016/j.ekir.2021.02.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 02/08/2021] [Indexed: 12/28/2022] Open
Abstract
INTRODUCTION Deciphering the intricacies of the interactions of glomerulopathic Ig light chains with mesangial cells is key to delineate signaling events responsible for the mesangial pathologic alterations that ensue. METHODS Human mesangial cells, caveolin 1 (CAV1), wild type (WT) ,and knockout (KO), were incubated with glomerulopathic light chains purified from the urine of patients with light chain-associated (AL) amyloidosis or light chain deposition disease. Associated signaling events induced by surface interactions of glomerulopathic light chains with caveolins and other membrane proteins, as well as the effect of epigallocatechin-3-gallate (EGCG) on the capacity of mesangial cells to intracellularly process AL light chains were investigated using a variety of techniques, including chemical crosslinking with mass spectroscopy, immunofluorescence, and ultrastructural immunolabeling. RESULTS Crosslinking experiments provide evidence suggesting that sortilin-related receptor (SORL1), a transmembrane sorting receptor that regulates cellular trafficking of proteins, is a component of the receptor on mesangial cells for glomerulopathic light chains. Colocalization of glomerulopathic light chains with SORL1 in caveolae and also in lysosomes when light chain internalization occurred, was documented using double immunofluorescence and immunogold labeling ultrastructural techniques. It was found that EGCG directly blocks c-Fos cytoplasmic to nuclei signal translocation after interactions of AL light chains with mesangial cells, resulting in a decrease in amyloid formation. CONCLUSION Our findings document for the first time a role for SORL1 linked to glomerular pathology and signaling events that take place when certain monoclonal light chains interact with mesangial cells. This finding may lead to novel therapies for treating renal injury caused by glomerulopathic light chains.
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Affiliation(s)
- Guillermo A. Herrera
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
- Correspondence: Guillermo A. Herrera, Department of Pathology, University of South Alabama, College of Medicine, 2451 USA Medical Center Drive, Mobile, Alabama 36617, USA.
| | - Luis del Pozo-Yauner
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
| | - Jiamin Teng
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
| | - Chun Zeng
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
| | - Xinggui Shen
- Louisiana State University, Health Sciences Center, Shreveport, Louisiana, USA
| | - Takahito Moriyama
- Department of Medicine, Kidney Center, Tokyo Women’s Medical University, Tokyo, Japan
| | | | - Bing Liu
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
| | - Elba A. Turbat-Herrera
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
- Mitchell Cancer Institute, College of Medicine, University of South Alabama, Mobile, Alabama, USA
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Hovater MB, Ying WZ, Agarwal A, Sanders PW. Nitric oxide and carbon monoxide antagonize TGF-β through ligand-independent internalization of TβR1/ALK5. Am J Physiol Renal Physiol 2014; 307:F727-35. [PMID: 25100282 DOI: 10.1152/ajprenal.00353.2014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Transforming growth factor (TGF)-β plays a central role in vascular homeostasis and in the pathology of vascular disease. There is a growing appreciation for the role of nitric oxide (NO) and carbon monoxide (CO) as highly diffusible, bioactive signaling molecules in the vasculature. We hypothesized that both NO and CO increase endocytosis of TGF-β receptor type 1 (TβR1) in vascular smooth muscle cells (VSMCs) through activation of dynamin-2, shielding cells from the effects of circulating TGF-β. In this study, primary cultures of VSMCs from Sprague-Dawley rats were treated with NO-releasing molecule 3 (a NO chemical donor), CO-releasing molecule 2 (a CO chemical donor), or control. NO and CO stimulated dynamin-2 activation in VSMCs. NO and CO promoted time- and dose-dependent endocytosis of TβR1. By decreasing TβR1 surface expression through this dynamin-2-dependent process, NO and CO diminished the effects of TGF-β on VSMCs. These findings help explain an important mechanism by which NO and CO signal in the vasculature by decreasing surface expression of TβR1 and the cellular response to TGF-β.
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Affiliation(s)
- Michael B Hovater
- Department of Medicine University of Alabama at Birmingham, Birmingham, Alabama
| | - Wei-Zhong Ying
- Department of Medicine University of Alabama at Birmingham, Birmingham, Alabama
| | - Anupam Agarwal
- Division of Nephrology, Nephrology Research and Training Center, University of Alabama at Birmingham, Birmingham, Alabama; Department of Medicine University of Alabama at Birmingham, Birmingham, Alabama; Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama; Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, Alabama; and Department of Veterans Affairs Medical Center, Birmingham, Alabama
| | - Paul W Sanders
- Division of Nephrology, Nephrology Research and Training Center, University of Alabama at Birmingham, Birmingham, Alabama; Department of Medicine University of Alabama at Birmingham, Birmingham, Alabama; Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama; Department of Veterans Affairs Medical Center, Birmingham, Alabama
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Chen PY, Gladish RD, Sanders PW. Vascular smooth muscle nitric oxide synthase anomalies in Dahl/Rapp salt-sensitive rats. Hypertension 1998; 31:918-24. [PMID: 9535415 DOI: 10.1161/01.hyp.31.4.918] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Salt-sensitive hypertension in the Dahl/Rapp rat (S strain) is prevented by L-arginine. Based on the observations that dexamethasone prevented the antihypertensive effect of L-arginine in these animals and the suggestion that a locus in or near an inducible nitric oxide synthase (NOS) gene on chromosome 10 cosegregated with hypertension in some F2 crosses that utilized the S rat, the present study explored the hypothesis that the vascular smooth muscle isoform of inducible NOS (NOS2) was abnormal in S rats. Primary cultures of aortic smooth muscle cells from S rats demonstrated impaired inducible NO production, which improved with increased L-arginine in the medium. Sequence analysis identified a single T-->C transversion that produced an amino acid substitution (S714P) between the FAD and FMN binding sites and a restriction fragment length polymorphism. This restriction fragment length polymorphism was present only in S rats. The mutation of NOS2 and the role of this enzyme in the pathogenesis of salt-sensitive hypertension in the Dahl/Rapp rat require further investigation.
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Affiliation(s)
- P Y Chen
- Nephrology Research and Training Center, Department of Medicine, University of Alabama at Birmingham, and Department of Veterans Affairs Medical Center, 35294-0007, USA
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