Sarcolemmal phosphatidylethanolamine reorganization during simulated ischaemia and reperfusion
| Autor: | Kasper Hoebe, J.A.F. Op den Kamp, E Pröbstl-Biegelmann, Arie J. Verkleij, T A van Veen, Jan A. Post, René J. P. Musters |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Vasodilator Agents
Myocardial Ischemia Phospholipid chemistry.chemical_element Myocardial Reperfusion Calcium chemistry.chemical_compound Adenosine Triphosphate Sarcolemma medicine Animals Myocyte Molecular Biology Cell damage Cells Cultured Phospholipids Phosphatidylethanolamine Chemistry Myocardium Phosphatidylethanolamines Cell Biology Calcium Channel Blockers medicine.disease Rats Oxygen Verapamil Biophysics Intracellular medicine.drug |
| Zdroj: | Molecular Membrane Biology. 13:159-164 |
| ISSN: | 1464-5203 0968-7688 |
| DOI: | 10.3109/09687689609160592 |
| Popis: | Exposure of cultured neonatal rat heart cells to simulated ischaemia results in a cessation of the spontaneous contractile activity and changes at both the level of sarcolemmal phospholipid topology and the ultrastructural level. Reperfusion at a timepoint before irreversible cell damage develops leads to a recovery of contractile activity. Furthermore, the shift in transbilayer distribution of sarcolemmal phosphatidylethanolamine in favour of the outer membrane leaflet, due to the ischaemic period, is reversed during subsequent reperfusion. Also the morphological changes (mitochondrial oedema, reorganization of the mitochondrial cristae and the formation of extrusions at the sarcolemma) are reversible. At the same time total intracellular ATP levels are restored to 80% of control. The role of cellular ATP content on sarcolemmal phospholipid topology was further studied by the use of the calcium antagonist verapamil (10 microM), which preserved cellular ATP content by inhibiting cell contractility before the onset of ischaemia. After 120 min of ischaemia, cell ATP content was still 63% of control in the presence of verapamil, versus 20% of control in untreated cells. Verapamil treatment also prevented the loss of the asymmetrical distribution of phosphatidylethanolamine and sarcolemmal disruption, the latter occurring during 120 min of ischaemia in untreated cells. It is proposed that maintenance of phospholipid asymmetry of the sarcolemma of the myocytes depends on the cellular ATP concentrations, indicating the involvement of an ATP dependent aminophospholipid translocase. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|