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Roy J, Fauconnier J, Oger C, Farah C, Angebault-Prouteau C, Thireau J, Bideaux P, Scheuermann V, Bultel-Poncé V, Demion M, Galano JM, Durand T, Lee JCY, Le Guennec JY. Non-enzymatic oxidized metabolite of DHA, 4(RS)-4-F 4t-neuroprostane protects the heart against reperfusion injury. Free Radic Biol Med 2017; 102:229-239. [PMID: 27932075 DOI: 10.1016/j.freeradbiomed.2016.12.005] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Revised: 11/28/2016] [Accepted: 12/04/2016] [Indexed: 10/20/2022]
Abstract
Acute myocardial infarction leads to an increase in oxidative stress and lipid peroxidation. 4(RS)-4-F4t-Neuroprostane (4-F4t-NeuroP) is a mediator produced by non-enzymatic free radical peroxidation of the cardioprotective polyunsaturated fatty acid, docosahexaenoic acid (DHA). In this study, we investigated whether intra-cardiac delivery of 4-F4t-NeuroP (0.03mg/kg) prior to occlusion (ischemia) prevents and protects rat myocardium from reperfusion damages. Using a rat model of ischemic-reperfusion (I/R), we showed that intra-cardiac infusion of 4-F4t-NeuroP significantly decreased infarct size following reperfusion (-27%) and also reduced ventricular arrhythmia score considerably during reperfusion (-41%). Most notably, 4-F4t-NeuroP decreased ventricular tachycardia and post-reperfusion lengthening of QT interval. The evaluation of the mitochondrial homeostasis indicates a limitation of mitochondrial swelling in response to Ca2+ by decreasing the mitochondrial permeability transition pore opening and increasing mitochondria membrane potential. On the other hand, mitochondrial respiration measured by oxygraphy, and mitochondrial ROS production measured with MitoSox red® were unchanged. We found decreased cytochrome c release and caspase 3 activity, indicating that 4-F4t-NeuroP prevented reperfusion damages and reduced apoptosis. In conclusion, 4-F4t-NeuroP derived from DHA was able to protect I/R cardiac injuries by regulating the mitochondrial homeostasis.
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Affiliation(s)
- Jérôme Roy
- Inserm U1046 - UMR CNRS 9214 PHYMEDEX, Université de Montpellier, Montpellier, France.
| | - Jérémy Fauconnier
- Inserm U1046 - UMR CNRS 9214 PHYMEDEX, Université de Montpellier, Montpellier, France
| | - Camille Oger
- IBMM, CNRS UMR 5247, Université de Montpellier, ENSCM, Montpellier, France
| | - Charlotte Farah
- Inserm U1046 - UMR CNRS 9214 PHYMEDEX, Université de Montpellier, Montpellier, France
| | | | - Jérôme Thireau
- Inserm U1046 - UMR CNRS 9214 PHYMEDEX, Université de Montpellier, Montpellier, France
| | - Patrice Bideaux
- Inserm U1046 - UMR CNRS 9214 PHYMEDEX, Université de Montpellier, Montpellier, France
| | - Valérie Scheuermann
- Inserm U1046 - UMR CNRS 9214 PHYMEDEX, Université de Montpellier, Montpellier, France
| | | | - Marie Demion
- Inserm U1046 - UMR CNRS 9214 PHYMEDEX, Université de Montpellier, Montpellier, France
| | - Jean-Marie Galano
- IBMM, CNRS UMR 5247, Université de Montpellier, ENSCM, Montpellier, France
| | - Thierry Durand
- IBMM, CNRS UMR 5247, Université de Montpellier, ENSCM, Montpellier, France
| | | | - Jean-Yves Le Guennec
- Inserm U1046 - UMR CNRS 9214 PHYMEDEX, Université de Montpellier, Montpellier, France
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Vandier C, Le Guennec JY, Bedfer G. What are the signaling pathways used by norepinephrine to contract the artery? A demonstration using guinea pig aortic ring segments. ADVANCES IN PHYSIOLOGY EDUCATION 2002; 26:195-203. [PMID: 12189127 DOI: 10.1152/advan.00062.2001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The laboratory exercise described in this article used a simple preparation and a straightforward protocol to illustrate how the neurotransmitter norepinephrine (NE) induces an increase of tension in an artery. This was a practical class designed for undergraduate students of the University of Tours. The students performed several protocols to understand how NE acts to contract aortic ring vessels, which sources of calcium are mobilized, and whether the calcium sensitivity of the contractile regulatory apparatus is involved. The design of this exercise allowed students to participate actively in an exercise demonstrating that many mechanisms are involved and act additively to allow arterial tone to develop. Furthermore, the students were introduced to an isolated organ chamber technique that is used to study cellular mechanisms of many tissues and that is still important for smooth muscle research.
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Affiliation(s)
- Christophe Vandier
- Laboratoire de Physiopathologie de la paroi arterielle, Croissance et Cancer, EA2103, Faculté de Médecine, 37032 Tours, France.
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