Chemiluminescent Real Time Imaging of Post-Ischemic Oxygen Free Radicals Formation in Livers Isolated From Young and Old Rats
| Autor: | Mauro Bernardi, Antonino Cavallari, Antonio Gasbarrini, Stefania De Notariis, Patrizia Pasini, Mara Simoncini, Aldo Roda, Enrico Roda, Bruno Nardo |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Male
Aging medicine.medical_specialty Free Radicals Radical Ischemia medicine.disease_cause Biochemistry law.invention chemistry.chemical_compound Superoxides law Physiology (medical) Internal medicine medicine Animals Lucigenin Rats Wistar Chemiluminescence Liver injury Superoxide medicine.disease Rats Endocrinology Liver chemistry Reperfusion Injury Luminescent Measurements Acridines Luminescence Oxidative stress |
| Zdroj: | Free Radical Biology and Medicine. 24:211-216 |
| ISSN: | 0891-5849 |
| DOI: | 10.1016/s0891-5849(97)00056-7 |
| Popis: | Oxygen free radicals generation is a major cause of liver injury during reperfusion. Luminescence analysis has been recently proposed to measure free radical generation by isolated cells or organs, but it allows only global tissue luminescence. Using a special Saticon videocamera with image intensifier we aimed to visualize and localize oxygen free radical generation in isolated perfused livers exposed to an oxydative stress. Livers isolated from rats aged 4 and 30 months were exposed to ischemia/reperfusion; photons emission by the organs was continuously recorded. Lucigenin was utilized as a chemiluminigenic probe to assess superoxide anion generation. In both groups, chemiluminescence was not detectable during ischemia, while it was observed after reperfusion. Photons emission started after few minutes of reperfusion, was maximal after 15-20 min and disappeared within 50-60 min. Chemiluminescence emitted by livers from younger rats however, was significantly higher when compared to chemiluminescence emitted by organs isolated from old rats (0.8 +/- 0.1 vs 0.44 +/- 0.08 photons x 10(5)/s, respectively, after 15 min; p.01). The superimposition of chemiluminescent and live image permitted to determine the regional production rate and distribution of photons. In conclusion, the age of the rats influences significantly the amount of oxyradicals produced in the liver during post-ischemic reperfusion. The method described, allowing the visualization in real time of oxygen free radicals generation on the surface of isolated intact organs, represents a novel and potent tool for the study of oxidative stress. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect