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Dutta B, Mahanty M, Kesavalu L, Rahaman SO. Mechanisms underlying TRPV4-mediated regulation of miR-146a expression. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.03.587984. [PMID: 38617263 PMCID: PMC11014524 DOI: 10.1101/2024.04.03.587984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
Persistent inflammation is a major contributor in the development of various inflammatory diseases like atherosclerosis. Our study investigates how transient receptor potential vanilloid 4 (TRPV4), a mechanosensitive ion channel, interacts with microRNA-146a (miR-146a), within the context of inflammation and atherosclerosis. Micro-RNAs play a critical role in controlling gene expression, and miR-146a is notable for its anti-inflammatory actions. TRPV4 is activated by diverse soluble and mechanical stimuli, and often associated with inflammatory responses in various diseases. Here, we find that TRPV4 negatively regulates miR-146a expression in macrophages, especially following stimulation by lipopolysaccharides or alterations in matrix stiffness. We show that in atherosclerosis, a condition characterized by matrix stiffening, TRPV4 decreases miR-146a expression in aortic tissue macrophages. We find that TRPV4's impact on miR-146a is independent of activation of NFκB, Stat1, P38, and AKT, but is rather mediated through a mechanism involving histone deacetylation instead of DNA methylation at the miR-146a promoter site. Furthermore, we show that N-terminal residues 1 to 130 in TRPV4 is essential in suppression of miR-146a expression in LPS-stimulated macrophages. Altogether, this study identifies a regulatory mechanism of miR-146a expression by TRPV4 which may open new potential therapeutic strategies for managing inflammatory diseases.
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Wernlé K, Thiel CS, Ullrich O. Increased H3K9me3 and F-Actin Reorganization in the Rapid Adaptive Response to Hypergravity in Human T Lymphocytes. Int J Mol Sci 2023; 24:17232. [PMID: 38139061 PMCID: PMC10743231 DOI: 10.3390/ijms242417232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/27/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023] Open
Abstract
Our study explored the impact of hypergravity on human T cells, which experience additional acceleration forces beyond Earth's gravity due to various factors, such as pulsatile blood flow, and technology, such as high-performance aircraft flights or spaceflights. We investigated the histone modifications Histone 3 lysine 4 and 9 trimethylation (H3K4me3 and H3K9me3, respectively), as well as the structural and cytoskeletal organization of Jurkat T cells in response to hypergravity. Histone modifications play a crucial role in gene regulation, chromatin organization and DNA repair. In response to hypergravity, we found only minimal changes of H3K4me3 and a rapid increase in H3K9me3, which was sustained for up to 15 min and then returned to control levels after 1 h. Furthermore, rapid changes in F-actin fluorescence were observed within seconds of hypergravity exposure, indicating filament depolymerization and cytoskeletal restructuring, which subsequently recovered after 1 h of hypergravity. Our study demonstrated the rapid, dynamic and adaptive cellular response to hypergravity, particularly in terms of histone modifications and cytoskeletal changes. These responses are likely necessary for maintaining genome stability and structural integrity under hypergravity conditions as they are constantly occurring in the human body during blood cell circulation.
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Affiliation(s)
- Kendra Wernlé
- Institute of Anatomy, Faculty of Medicine, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;
- Faculty of Medical Sciences, Private University of the Principality of Liechtenstein (UFL), Dorfstrasse 24, 9495 Triesen, Liechtenstein
| | - Cora S. Thiel
- Institute of Anatomy, Faculty of Medicine, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;
- Institute of Machine Design, Otto-von-Guericke-University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
- Space Life Sciences Laboratory (SLSL), Kennedy Space Center, 505 Odyssey Way, Exploration Park, Merritt Island, FL 32953, USA
- UZH Space Hub, Air Force Center, Air Base Dübendorf, Überlandstrasse 270, 8600 Dubendorf, Switzerland
| | - Oliver Ullrich
- Institute of Anatomy, Faculty of Medicine, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;
- Institute of Machine Design, Otto-von-Guericke-University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
- Space Life Sciences Laboratory (SLSL), Kennedy Space Center, 505 Odyssey Way, Exploration Park, Merritt Island, FL 32953, USA
- UZH Space Hub, Air Force Center, Air Base Dübendorf, Überlandstrasse 270, 8600 Dubendorf, Switzerland
- Department of Industrial Engineering, Ernst-Abbe-Hochschule (EAH) Jena, Carl-Zeiss-Promenade 2, 07745 Jena, Germany
- Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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