Abstract | BACKGROUND: OBJECTIVE: METHODS: Here we introduced transient and permanent left anterior descending artery (LAD) occlusions in mice. We inhibited β1 integrin by intravenous injection of function- blocking antibodies and tamoxifen-induced endothelial cell (EC)-specific deletion of Itgb1. Furthermore, human ITGB1 was silenced in primary human coronary artery ECs using small interfering RNA. We analyzed the numbers of proliferating ECs and arterioles by immunohistochemistry, determined infarct size by magnetic resonance imaging (MRI) and triphenyl tetrazolium chloride staining, and analyzed cardiac function by MRI and echocardiography. RESULTS: Transient LAD occlusions were found to increase EC proliferation and arteriole formation in the entire myocardium. These effects required β1 integrin on ECs, except for arteriole formation in the ischemic part of the myocardium. Furthermore, this integrin subunit was also relevant for basal and mechanically induced proliferation of human coronary artery ECs. Notably, β1 integrin was needed for cardioprotection induced by transient LAD occlusions, and the absence of endothelial β1 integrin resulted in impaired growth of blood vessels into the infarcted myocardium and reduced cardiac function after permanent LAD occlusion. CONCLUSION:
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Authors | Carina Henning, Anna Branopolski, Paula Follert, Oksana Lewandowska, Aysel Ayhan, Marcel Benkhoff, Ulrich Flögel, Malte Kelm, Christian Heiss, Eckhard Lammert |
Journal | Thrombosis and haemostasis
(Thromb Haemost)
Vol. 121
Issue 6
Pg. 741-754
(Jun 2021)
ISSN: 2567-689X [Electronic] Germany |
PMID | 33469904
(Publication Type: Journal Article, Video-Audio Media)
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Copyright | The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Chemical References |
- Integrin beta1
- Itgb1 protein, human
- Itgb1 protein, mouse
- Nitric Oxide Synthase Type III
- Nos3 protein, mouse
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Topics |
- Animals
- Cell Proliferation
- Coronary Vessels
(metabolism, pathology)
- Disease Models, Animal
- Endothelial Cells
(metabolism, pathology)
- Humans
- Integrin beta1
(genetics, metabolism)
- Ischemic Preconditioning, Myocardial
- Male
- Mice, Inbred C57BL
- Mice, Knockout
- Myocardial Infarction
(genetics, metabolism, pathology, prevention & control)
- Neovascularization, Physiologic
- Nitric Oxide Synthase Type III
(genetics, metabolism)
- Signal Transduction
- Young Adult
- Mice
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