Summary
Hypoxia/ischemia and reoxygenation/reperfusion were studied in rat hearts and rat hind limbs. Free radicals are known to be generated through these events and to cause complications. In order to reduce hypoxic/ischemic and especially reoxygenation/reperfusion injury we ameliorated (re)perfusion conditions including the treatment with dihydrolipoic acid (DHL).
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1.
In isolated working rat hearts DHL, if added into the perfusion buffer at 0.3μM concentration, keeps the pH higher (7.15) during hypoxia as compared to controls (6.98). The compound accelerates the recovery of the aortic flow and stabilizes it during reoxygenation. With DHL, ATPase activity is reduced, ATP synthesis is increased and phosphocreatine contents are higher than in controls. Creatine kinase activity is maintained during reoxygenation in the DHL treated series.
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2.
Isolated rat hind limbs were stored for 4h in a moist chamber at 18°C. Controls were perfumed for 30 min. with a modified Krebs-Henseleit buffer at 60 mm Hg followed by 30 min. Krebs-Henseleit perfusion at 100 mm Hg. The DHL group contained 8 μM DHL in the modified reperfusate. With DHL, recovery of the contractile function was 49 % (va. 34 % in controls) and muscle flexibility was maintained whereas it decreased by 15 % in the controls. Release of creatine kinase was significantly lower with DHL treatment.
DHL is efficient in reducing reoxygenation injury in isolated working rat hearts and reperfusion damage in isolated ischemic rat hind limbs.
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Freisleben, H.J., Beyersdorf, F., Seewald, H.A., Simon, J., Hanselmann, A., Zimer, G. (1992). Dihydrolipoic Acid Is Protective Against Reperfusion Injury. In: Ong, A.S.H., Packer, L. (eds) Lipid-Soluble Antioxidants: Biochemistry and Clinical Applications. Molecular and Cell Biology Updates. Birkhäuser Basel. https://doi.org/10.1007/978-3-0348-7432-8_41
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DOI: https://doi.org/10.1007/978-3-0348-7432-8_41
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