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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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Stojanović M, Šćepanović L, Bosnić O, Mitrović D, Jozanov-Stankov O, Šćepanović V, Šćepanović R, Stojanović T, Ilić S, Djurić D. Effects of Acute Administration of D,L-Homocysteine Thiolactone on the Antioxidative Status of Rat Intestine and Liver. ACTA VET-BEOGRAD 2016. [DOI: 10.1515/acve-2016-0002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Oxidative stress appears to play a role in the pathogenesis of several inflammatory gastrointestinal diseases. Increased homocysteine levels may play a role in the pathogenesis of Chron’s disease and ulcerative colitis. The aim of this study was to examine the influence of homocysteine on the antioxidant status of rat intestine and liver. The levels of thiobarbituric acid reactive substances (TBARS), activity of catalase (CAT) and total antioxidant status (TAS) were investigated in the isolated gut and liver of young male rats in the control group (8 rats) and after 3-hоur incubation in high doses of D, L-homocysteine thionolactone (Hcy) (10 μmol/L) (8 rats). Samples of duodenum, ileum, colon and liver were homogenized in sodium phosphate buffer (1:10). Homogenates were centrifuged at 10000 for 10 min at 4° C and the supernatant was taken for biochemical assays. Our results showed that high D, L-homocysteine thionolactone concentration reduced enzymatic catalase activity in homogenates of the isolated segments of duodenum (27.04%) p<0.01; ileum (37.27%), colon (34.17%) and liver (67.46%) p<0.001. Exposition to high D,L-homocysteine thiolactone concentration significantly increased TBARS levels in the duodenum (106.05%), ileum (47.24%), colon (112.75%) and liver (32.07%) (p<0.01). Homocysteine also modifi ed the total antioxidant status of homogenates from the duodenum, ileum, colon and liver, increasing by 20.68% (duodenum), 24.74% (ileum), 14.88% (colon) and 19.35% (liver) (p<0.001). Homocysteine induced a consistent oxidative stress in rat’s intestine and liver (reduced activity of catalase and increased level of TBARS), but the elevated activity of TAS in our experiments could be explained as an adaptive response to the generated free radicals which indicates the failure of the total antioxidant defense mechanism to protect the tissues from damage caused by homocysteine.
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Affiliation(s)
- Marija Stojanović
- Institute of Medical Physiology „Richard Burian“, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Ljiljana Šćepanović
- Institute of Medical Physiology „Richard Burian“, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Olivera Bosnić
- Institute of Medical Physiology „Richard Burian“, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Dušan Mitrović
- Institute of Medical Physiology „Richard Burian“, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Olga Jozanov-Stankov
- Institute of Nuclear Sciences Vinca, Laboratory for Radiobiology and Molecular Genetics, University of Belgrade, Belgrade, Serbia
| | - Vuk Šćepanović
- Institute for Neurosurgery, Clinical Center of Serbia, University of Belgrade, Belgrade, Serbia
| | - Radomir Šćepanović
- Belgrade University of Defense, Military Medical Academy, Belgrade, Serbia
| | | | - Slobodan Ilić
- University Children’s Hospital, University of Belgrade, Belgrade, Serbia
| | - Dragan Djurić
- Institute of Medical Physiology „Richard Burian“, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
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