Effects of a cantaloupe melon extract/wheat gliadin biopolymer during aortic cross-clamping
We previously reported in healthy volunteers that a cantaloupe melon extract chemically combined with wheat gliadin (melon extract/gliadin) and containing SOD, catalase and residual glutathione peroxidase (GPx), protected against DNA strand-break damage induced by hyperbaric oxygen (HBO), a well-established model of DNA damage resulting from oxidative stress. Aortic cross-clamping is a typical example of ischemia/reperfusion injury-related oxidative stress, and therefore we investigated whether this melon extract/gliadin would also reduce DNA damage after aortic cross-clamping and reperfusion.
Prospective, randomized, controlled experimental study.
Patients and participants
18 anesthetized, mechanically ventilated and instrumented pigs.
After 14 days of oral administration of 1250 mg of the melon extract/gliadin (n = 9) or vehicle (n = 9), animals underwent 30 min of thoracic aortic cross-clamping and 4 h of reperfusion.
Measurements and results
Before clamping, immediately before declamping, and at 2 and 4 h of reperfusion, we measured blood isoprostane (immunoassay) and malondialdehyde concentrations (fluorimetric thiobarbituric acid test), SOD, catalase and GPx activities (spectrophotometric kits), NO formation (nitrate+nitrite; chemoluminescence), DNA damage in whole blood samples and isolated lymphocytes exposed to hyperbaric oxygen (comet assay). Organ function was also evaluated. Kidney and spinal cord specimen were analysed for apoptosis (TUNEL assay). The melon extract/gliadin blunted the DNA damage, reduced spinal cord apoptosis and attenuated NO release, however, without any effect on lipid peroxidation and organ function.
Pre-treatment with the oral melon extract/gliadin may be a therapeutic option to reduce oxidative cell injury affiliated with aortic cross-clamping.
KeywordsIschemia/reperfusion injury Hyperbaric oxygen Comet assay Apoptosis Nitric oxide Kidney Spinal cord
This study was supported by the Deutsche Forschungsgemeinschaft (DFG Sche 899/2–1). B. Hauser was the recipient of a Roman Herzog research fellowship of the Alexander von Humboldt Stiftung and the Gemeinnützige Hertie Stiftung, and S. Öter was supported by an educational and research grant of the Turkish Air Force. Glisodine was kindly provided by B. Montanari (Isocell Nutra S. A., France). Very special thanks are dedicated to W. Siegler, T. Schulz, I. Eble, A. Söll, S. Schunter, U. Biel, T. Schaller, S. Geisler and T. Seiferlein for their skilful technical assistance.
- 6.Nagel E, Meyer ZU, Vilsendorf A, Bartels M, Pichlmayer R (1997) Antioxidant vitamins in prevention of ischemia/reperfusion injury. Int J Vit Nutr Res 67:298–306Google Scholar
- 8.Dimakakos PB, Kotsis T, Kondi-Pafiti A, Katsenis K, Doufas A, Chondors K, Kouskouni E (2002) Oxygen free radicals in abdominal aortic surgery. An experimental study. J Cardiovasc Surg (Torino) 43:77–82Google Scholar
- 14.Svensson LG, Ritter CM von, Groeneveld HT, Rickards ES, Hunter SJ, Robinson MF, Hinder RA (1986) Cross-clamping of the thoracic aorta. Influence of aortic shunts, laminectomy, papaverine, calcium channel blocker, allopurinol, and superoxide dismutase on spinal cord blood flow and paraplegia in baboons. Ann Surg 204:38–47PubMedCrossRefGoogle Scholar
- 23.Hauser B, Gröger M, Ehrmann U, Albicini M, Brückner UB, Schelzig H, Venkatesh B, Li H, Szabó C, Speit G, Radermacher P, Kick J (2006) The PARP-inhibitor IN1001 facilitates hemodynamic stabilization without affecting DNA repair in porcine thoracic aortic cross-clamping-induced ischemia-reperfusion. Shock 25:633–640PubMedCrossRefGoogle Scholar