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Luo SS, Sugimoto K, Fujii S, Takemasa T, Fu SB, Yamashita K. Role of heat shock protein 70 in induction of stress fiber formation in rat arterial endothelial cells in response to stretch stress. Acta Histochem Cytochem 2007; 40:9-17. [PMID: 17375204 PMCID: PMC1828078 DOI: 10.1267/ahc.06011] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Accepted: 12/07/2006] [Indexed: 11/22/2022] Open
Abstract
We investigated the mechanism by which endothelial cells (ECs) resist various forms of physical stress using an experimental system consisting of rat arterial EC sheets. Formation of actin stress fibers (SFs) and expression of endothelial heat-shock stress proteins (HSPs) in response to mechanical stretch stress were assessed by immunofluorescence microscopy. Stretch stimulation increased expression of HSPs 25 and 70, but not that of HSP 90. Treatment with SB203580, a p38 MAP kinase inhibitor that acts upstream of the HSP 25 activation cascade, or with geldanamycin, an inhibitor of HSP 90, had no effect on the SF formation response to mechanical stretch stress. In contrast, treatment with quercetin, an HSP 70 inhibitor, inhibited both upregulation of endothelial HSP 70 and formation of SFs in response to tensile stress. In addition, treatment of stretched ECs with cytochalasin D, which disrupts SF formation, did not adversely affect stretch-induced upregulation of endothelial HSP 70. Our data suggest that endothelial HSP 70 plays an important role in inducing SF formation in response to tensile stress.
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Affiliation(s)
- Shan-Shun Luo
- Department of Molecular Anatomy, Nippon Medical School, Tokyo 113–8602, Japan
- Department of Internal Medicine, Harbin Medical University, Harbin 150001, China
- Correspondence to: Keiji Sugimoto, Ph.D., Shan-Shun Luo, M.D., Ph.D., Department of Molecular Anatomy, Nippon Medical School, Sendagi 1–1–5, Tokyo 113–8602, Japan. E-mail:
| | - Keiji Sugimoto
- Department of Molecular Anatomy, Nippon Medical School, Tokyo 113–8602, Japan
- Correspondence to: Keiji Sugimoto, Ph.D., Shan-Shun Luo, M.D., Ph.D., Department of Molecular Anatomy, Nippon Medical School, Sendagi 1–1–5, Tokyo 113–8602, Japan. E-mail:
| | - Sachiko Fujii
- Department of Molecular Anatomy, Nippon Medical School, Tokyo 113–8602, Japan
| | - Tohru Takemasa
- Institute of Health and Sports Sciences, University of Tsukuba, Ibaragi 305–8574, Japan
| | - Song-Bin Fu
- Laboratory of Medical Genetics, Harbin Medical University, Harbin 150086, China
| | - Kazuo Yamashita
- Department of Molecular Anatomy, Nippon Medical School, Tokyo 113–8602, Japan
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Sugimoto K, Fujii S, Sago H, Yoshida K, Takemasa T, Yamashita K. Role of marginal stress fibers formed in the rat vascular endothelial cells. Tissue Cell 1993; 25:825-31. [PMID: 8140578 DOI: 10.1016/0040-8166(93)90031-f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Fluorescence cytochemistry using en face preparations of rat vascular endothelial cells (ECs) revealed the localization of actin, fibronectin (FN) and fibronectin receptor (FNR) along not only central stress fibers (SFs) but also the cell margins. Electron microscopy showed very close proximity between the topographical distribution of intracellular microfilament bundles and that of subendothelial FN in the EC margins. Therefore, these basal and marginal actin cables may be comparable to the well-established central SFs present in ECs. Formation of the central SFs was induced in ECs or mesothelial cells in response to tension, by which their cellular integrity seems to be effectively maintained. However, even when central SF formation was inhibited by cytochalasin D, the ECs with marginal SFs showed high resistance to mechanical tension, whereas mesenteric mesothelial cells having no such fibers easily lost their integrity. Thus, together with central SFs, the marginal SFs characteristic of rat vascular ECs may play an essential role in strengthening cell-matrix adhesion.
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Affiliation(s)
- K Sugimoto
- Department of Anatomy, Nippon Medical School, Tokyo, Japan
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Sugimoto K, Fujii S, Yamashita K. Expression of stress fibers in bullfrog mesothelial cells in response to tension. Exp Cell Res 1991; 196:353-61. [PMID: 1893944 DOI: 10.1016/0014-4827(91)90271-u] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The relationship between stress fibers and tension in mesothelial cells of the bullfrog small intestine was examined by fluorescence cytochemistry using en face mesothelial cell preparations. In nontreated controls, actin revealed by rhodamine-phalloidin staining was localized only along the margins of the mesothelial cells. On the other hand, many stress fibers were formed in the mesothelial cells within 5-7 min after stretching of the intestinal wall in a given direction. The orientation of stress fibers within the cells was coincident with the direction of the tension applied. These cytoplasmic fibers disappeared almost completely from the mesothelial cells within 30 min after the release of tension. According to a difference in the intensity of tension necessary for stress fiber expression, the intestinal mesothelial cells were classified into two groups. Furthermore, cells containing stress fibers in each group showed a rapid increase in number once a given value of tension was applied. The present results indicate that the mesothelial cells of bullfrog small intestine may develop stress fibers to counteract tension exerted on the intestinal wall. Such stress fibers may serve to maintain cellular integrity by strengthening the cellular attachment to subepithelial tissue.
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Affiliation(s)
- K Sugimoto
- Department of Anatomy, Nippon Medical School, Tokyo, Japan
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