Volska 2013 Abstract MiP2013: Difference between revisions
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|area=Respiration | |area=Respiration, Pharmacology;toxicology | ||
|organism=Rat | |organism=Rat | ||
|tissues=Nervous system | |tissues=Nervous system | ||
|preparations=Isolated Mitochondria | |preparations=Isolated Mitochondria | ||
|injuries= | |injuries=Ischemia-Reperfusion; Preservation | ||
|topics=Coupling efficiency;uncoupling | |||
|couplingstates=LEAK, OXPHOS | |couplingstates=LEAK, OXPHOS | ||
|additional=MiP2013 | |substratestates=CI | ||
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Revision as of 00:04, 19 August 2013
Volska K, Makrecka M, Svalbe B, Dambrova M (2013) The inhibitor of L-carnitine biosynthesis protects brain mitochondria against anoxia-reoxygenation injury. Mitochondr Physiol Network 18.08. |
Link:
Volska K, Makrecka M, Svalbe B, Dambrova M (2013)
Event: MiP2013
L-carnitine takes part in the regulation of cellular energy metabolism. Recently it has been shown that mildronate, an inhibitor of L-carnitine biosynthesis, improves the neurological outcome after ischemic damage of brain tissue [1]. The aim of the present study was to investigate the effects of mildronate treatment on brain mitochondrial function using an in vitro model of anoxia-reoxygenation.
Wistar rats were treated daily with mildronate (per os; 100 mg/kg) for 14 days. Control animals received water. The mitochondrial respiration measurements were performed in isolated brain mitochondria with a Clark-type oxygen sensor. OXPHOS capacity was measured using ADP and various substrates to evaluate respiration of all respiratory complexes. In order to investigate anoxia-reoxygenation damage, brain mitochondria were subjected to 5 min anoxia, followed by 5 min reoxygenation. In parallel, isolated mitochondria were treated under the same conditions but without 5 min anoxia to obtain control (normoxic) measurements. Respiratory parameters were determined: LEAK respiration in the absence of ADP (LN); OXPHOS capacity (P); LEAK respiration after phosphorylation of ADP to ATP (LT); respiratory control ratio (P/LT, RCR).
Under normoxic conditions, mildronate treatment did not affect LN and P. However, LT was increased by 30%, resulting in a 28% decreased RCR. Anoxia-reoxygenation induced a significant 2.8-fold decrease in P and a 1.6-fold increase LT. These effects of anoxia-reoxygenation resulted in 4-fold reduction of the RCR. The mildronate treatment significantly diminished the anoxia-reoxygenation-induced decrease in P and increase in LT by 20% and 36%, respectively. After anoxia-reoxygenation the RCR was almost 2 times higher in the mildronate treated group compared to controls.
These results demonstrate that mildronate treatment induces uncoupling preconditioning-like effect and improves tolerance against anoxia-reoxygenation.
Labels: MiParea: Respiration, Pharmacology;toxicology
Stress:Ischemia-Reperfusion; Preservation"Ischemia-Reperfusion; Preservation" is not in the list (Cell death, Cryopreservation, Ischemia-reperfusion, Permeability transition, Oxidative stress;RONS, Temperature, Hypoxia, Mitochondrial disease) of allowed values for the "Stress" property. Organism: Rat Tissue;cell: Nervous system Preparation: Isolated Mitochondria"Isolated Mitochondria" is not in the list (Intact organism, Intact organ, Permeabilized cells, Permeabilized tissue, Homogenate, Isolated mitochondria, SMP, Chloroplasts, Enzyme, Oxidase;biochemical oxidation, ...) of allowed values for the "Preparation" property.
Regulation: Coupling efficiency;uncoupling Coupling state: LEAK, OXPHOS
MiP2013
Affiliations and author contributions
1 - Riga Stradins University, Latvia;
2 - Latvian Institute of Organic Synthesis, Riga, Latvia;
3 - University of Latvia, Riga, Latvia.
Email: [email protected]
References
- Svalbe B, Zvejniece L, Vavers E, Pugovics O, Muceniece R, Liepinsh E, Dambrova M (2011) Mildronate treatment improves functional recovery following middle cerebral artery occlusion in rats. Behav Brain Res 222: 26-32.