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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Ischemia-induced interleukin-8 release after human heart transplantation. A potential role for endothelial cells.

BACKGROUND: Interleukin-8 (IL-8) secreted from endothelial cells is a powerful neutrophil chemoattractant and activator. We hypothesized that human endothelial cells deprived of oxygen would secrete IL-8, which might translate into elevated IL-8 production after cardiac ischemia. Furthermore, we hypothesized that coronary sinus (CS) IL-8 levels would be particularly high after cardiac preservation for transplantation, due to extended ischemic times. METHODS AND RESULTS: Human saphenous vein endothelial cells exposed to a hypoxic environment (PO2 < 20 mm Hg) demonstrated a time-dependent release of IL-8 (measured by ELISA) into the culture supernatant as early as 4 hours after exposure. To determine whether cardiac preservation in humans was associated with IL-8 production, we obtained CS blood samples 5 minutes after reperfusion in a consecutive series of patients after they underwent cardiac transplantation ( CTX, n = 20) or elective cardiac surgery (non-CTX, n = 21). CTX patients demonstrated significantly higher CS IL-8 levels than non-CTX patients (325 +/- 123 versus 50 +/- 17 ng/mL, respectively, P < .05). Further analysis of the CS samples revealed that a biochemical marker of myocyte injury (myoglobin) was similarly elevated in the CTX patients compared with the non-CTX patients (3340 +/- 625 versus 1151 +/- 525 ng/mL, respectively, P < .05). CONCLUSIONS: These differences may reflect the longer ischemic times of CTX compared with non-CTX hearts (161 +/- 10 versus 80 +/- 6 minutes, P < .0001) and suggest that the neutrophil chemoattractant/activator IL-8 may contribute to myocyte injury after prolonged hypothermic cardiac ischemia, as occurs during human cardiac transplantation.[1]

References

  1. Ischemia-induced interleukin-8 release after human heart transplantation. A potential role for endothelial cells. Oz, M.C., Liao, H., Naka, Y., Seldomridge, A., Becker, D.N., Michler, R.E., Smith, C.R., Rose, E.A., Stern, D.M., Pinsky, D.J. Circulation (1995) [Pubmed]
 
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