Lipids in Health and Disease (Apr 2010)

Physiological response to lipid peroxidation in ischemia and reperfusion during carotid endarterectomy

  • Cordeddu Lina,
  • Murru Elisabetta,
  • Giordano Elena,
  • Sanna Daniela,
  • Finco Gabriele,
  • Sanfilippo Roberto,
  • Montisci Roberto,
  • Banni Sebastiano,
  • Carta Gianfranca,
  • Banni Donata,
  • Marchi Antonio

DOI
https://doi.org/10.1186/1476-511X-9-41
Journal volume & issue
Vol. 9, no. 1
p. 41

Abstract

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Abstract Background In this study we aimed to assess lipid peroxidation during carotid endarterectomy by the formation of PUFA hydroperoxides (PUFAHP) and isoprostanes (IP) and concomitant peroxisomal beta-oxidation as a physiological mechanism to limit their concentration. Two markers of peroxisomal beta oxidation have been evaluated, formation of 2,3 dinor from IP and conjugated esadecadienoic acid (CD 16:2) from peroxisomal beta-oxidation of conjugated linoleic acid (CLA), an unusual fatty acid present in small concentration in our diet and preferentially beta-oxidised in peroxisomes. The study was conducted on 30 patients undergoing carotid endarterectomy. Blood samplings were performed before, during endarterectomy in the "ischemic phase", and 30 seconds, 30 minutes and 2 hours after reperfusion. Results The results showed that PUFAHP increased significantly after 30 min of reperfusion in patients with controlateral stenosis > 50%, and steeply decreased after 2 hour of reperfusion. Interestingly, IP increased in a similar fashion of PUFAHP but never significantly. Both ratios CD16:2/CLA and DIN/IP also increased significantly after 30 min of reperfusion to decrease thereafter. Conclusions Our data show that lipid peroxidation takes place only in patients with high controlateral stenosis and within 2 hours occurs a physiological response aimed to decrease IP and PUFAHP by increasing their catabolism in peroxisomes.