Steinlechner-Maran 1997 Transplantation

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Steinlechner-Maran R, Eberl T, Kunc M, SchrΓΆcksnadel H, Margreiter R, Gnaiger E (1997) Respiratory defect as an early event in preservation/reoxygenation injury in endothelial cells. Transplantation 63:136-42.

Β» PMID: 9000675 Open Access

Steinlechner-Maran R, Eberl T, Kunc M, Schroecksnadel H, Margreiter R, Gnaiger Erich (1997) Transplantation

Abstract: Characterization of preservation injury in endothelial cells has been primarily accomplished by measurement of cell viability. To analyze early events and cellular mechanisms of preservation-reoxygenation injury, we developed high-resolution respirometry for the study of mitochondrial function in endothelial cells, to provide a quantitative marker for sublethal stress. Cultured human umbilical vein endothelial cells were stored for 4 and 8 hr at 4Β°C under an atmosphere of 95% N2 and 5% CO2 in University of Wisconsin (UW) and histidine-tryptophan-ketoglutarate (HTK) solutions. Respiration of suspended cells, measured after reoxygenation in growth medium at 37Β°C, was significantly reduced in all treatments in comparison to controls not subjected to cold preservation. In contrast, trypan blue staining was unchanged after 4 hr of preservation and was significant only after 8 hr. After 8 hr of cold storage in UW and HTK solutions, respiration was 64Β±5% and 49Β±6%, respectively, of controls (46.5Β±3.3 pmol O2Β·s-1Β·10-6 cells), indicating significantly better protection by UW solution than HTK solution. A titration regimen with substrate (succinate), uncoupler (carbonyl cyanide p-trifluorome-thoxyphenylhydrazone), and inhibitors of complexes I and III (rotenone and antimycin A) resulted in identical respiratory response patterns in all treatments. The plasma membrane remained impermeable to succinate. Inner mitochondrial membrane function was preserved as indicated by a constant relative increase of respiration after uncoupling. These results demonstrate that loss of catalytic capacity for respiration constitutes an early event in preservation-reoxygenation injury, whereas membrane damage is not a primary defect. Respirometric evaluation of sublethal cell injury and localization of cell damage may provide selective guidelines for further optimization of strategies in organ preservation.

β€’ O2k-Network Lab: AT Innsbruck Gnaiger E, AT Innsbruck Oroboros

Cited by

Gnaiger 2020 BEC MitoPathways
Gnaiger E (2020) Mitochondrial pathways and respiratory control. An introduction to OXPHOS analysis. 5th ed. Bioenerg Commun 2020.2.

Labels: MiParea: Respiration, mt-Biogenesis;mt-density, mt-Medicine  Pathology: Cardiovascular  Stress:Cell death, Ischemia-reperfusion  Organism: Human  Tissue;cell: Endothelial;epithelial;mesothelial cell, HUVEC  Preparation: Intact cells 

Regulation: Coupling efficiency;uncoupling  Coupling state: ROUTINE, ET  Pathway: ROX  HRR: Oxygraph-2k 

BEC 2020.2 

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