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Šćepanović V, Tasić G, Repac N, Nikolić I, Janićijević A, Todorović D, Stojanović M, Šćepanović R, Mitrović D, Šćepanović T, Borozan S, Šćepanović L. The role of oxidative stress as a risk factor for rupture of posterior inferior cerebellar artery aneurysms. Mol Biol Rep 2018; 45:2157-2165. [DOI: 10.1007/s11033-018-4374-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 09/07/2018] [Indexed: 01/01/2023]
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Stojanović M, Šćepanović L, Mitrović D, Šćepanović V, Šćepanović R, Djuric M, Ilić S, Šćepanović T, Djuric D. Different pathways involved in the stimulatory effects of homocysteine on rat duodenal smooth muscle. ACTA VET-BEOGRAD 2017. [DOI: 10.1515/acve-2017-0021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Abstract
Recent studies have confirmed that hyperhomocysteinemia is associated with gastrointestinal diseases; however, the direct effect of homocysteine on gastrointestinal reactivity still remains unknown. The aim of this study was to demonstrate how homocysteine may affect nitric oxide mediated duodenal relaxation and whether cholinergic receptors and K+ channels take part in stimulating motility, as well as to explore whether oxidative stress is associated with homocysteine-mediated effects. Experiments were carried out on male rats, body mass 250-300 g. Two groups of animals were treated by i.p. application of saline and D,L-Hcy (0.6 μmol/g bm). After 2h of incubation, the duodenal segments were prepared for biochemical analysis and contractile response measurements in an organ bath with Tyrode’s solution. Effects of TEA (10 mmol/L) and L-NAME (30 μmol/L) on duodenal contractility in the presence of D,L-Hcy (0.6 μmol/g bm) were investigated. Elevated homocysteine levels seem to be of crucial importance for the deterioration of contractility through nitric oxide mediated relaxation, and, in part, by activation of K+ channels. Hcy showed direct promuscarinic effects, since 30 min pretreatment of rat duodenum significantly enhanced the contractile effect of increasing concentrations of ACh (10−9-10−2 mol/L). Catalase activity, superoxide dismutase, glutathione peroxidase and the total antioxidant system were reduced while the thiobarbituric acid-reactive substances level was elevated. Our data showed a consistent profile of gastrointestinal injury elicited by sulfur-containing amino acid-homocysteine. This could contribute to explain, at least in part, the mechanisms involved in human gastrointestinal diseases associated to hyperhomocysteinemia.
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Affiliation(s)
- Marija Stojanović
- Institute of Medical Physiology „Richard Burian“, Faculty of Medicine , University of Belgrade , 11000 Belgrade , Serbia
| | - Ljiljana Šćepanović
- Institute of Medical Physiology „Richard Burian“, Faculty of Medicine , University of Belgrade , 11000 Belgrade , Serbia
| | - Dušan Mitrović
- Institute of Medical Physiology „Richard Burian“, Faculty of Medicine , University of Belgrade , 11000 Belgrade , Serbia
| | - Vuk Šćepanović
- Institute for Neurosurgery, Clinical Center of Serbia , University of Belgrade , 11000 Belgrade , Serbia
| | - Radomir Šćepanović
- Belgrade University of Defense , Military Medical Academy , 11000 Belgrade , Serbia
| | - Marko Djuric
- Department of Anaesthesiology, Reanimatology and Intensive Care , University Clinical Hospital „Dr Dragisa Misovic“ , Belgrade , Serbia
| | - Slobodan Ilić
- University Children’s Hospital, University of Belgrade , 11000 Belgrade , Serbia
| | | | - Dragan Djuric
- Institute of Medical Physiology „Richard Burian“, Faculty of Medicine , University of Belgrade , 11000 Belgrade , Serbia
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