Neutrophil mediated damage to isolated myocytes after anoxia and reoxygenation
| Autor: | Gitte Stawski, Peter Riis Hansen |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Neutrophils
Physiology Myocardial Reperfusion Injury Deferoxamine Biology Pharmacology Arginine Nitric oxide Superoxide dismutase chemistry.chemical_compound Antigens CD Physiology (medical) Lactate dehydrogenase Animals Myocyte Histidine alpha-Macroglobulins Pentoxifylline Cells Cultured Serpins chemistry.chemical_classification Reactive oxygen species L-Lactate Dehydrogenase Receptors Leukocyte-Adhesion Superoxide Dismutase Myocardium Cardiac myocyte Proteolytic enzymes Antibodies Monoclonal Proteins Catalase Rats N-Formylmethionine Leucyl-Phenylalanine chemistry Biochemistry CD18 Antigens biology.protein Cardiology and Cardiovascular Medicine Interleukin-1 |
| Zdroj: | Cardiovascular Research. 28:565-569 |
| ISSN: | 0008-6363 |
| DOI: | 10.1093/cvr/28.4.565 |
| Popis: | Objective: The aim was to assess the role of neutrophils in anoxia-reoxygenation induced, neutrophil mediated damage to cardiac myocytes. Methods: Neonatal rat cardiac myocytes in primary monolayer cultures were exposed to a 2 h period of anoxia, and subsequently reoxygenated for 3 h. Neutrophils were added at the time of reoxygenation, and myocyte injury was determined by release of lactate dehydrogenase (LDH). Results: Neutrophils produced a dose dependent increase in myocyte LDH release. This effect was not enhanced by coincubation with a neutrophil activator (formyl-Met-Leu-Phe), or interleukine lα (IL-lα), although IL-lα increased anoxic myocyte damage. Exposure to supematants from anoxic, or anoxic-reoxygenated, myocytes increased LDH release from normoxic myocytes, and conditioning of these supematants by neutrophils further increased their cytotoxic potential. The anoxia-reoxygenation induced, neutrophil mediated LDH release was attenuated by some oxygen radical scavengers (superoxide dismutase, histidine, and desferrioxamine), but not others (catalase). Marked decrease in LDH release was also observed after addition of L-arginine, the substrate for synthesis of nitric oxide, along with the neutrophils at the time of reoxygenation. In addition, neutrophil mediated myocyte injury was attenuated by protease inhibitors (Eglin C and α2 macroglobulin), an anti-CD 18 monoclonal antibody, and the methylxanthine derivative pentoxifylline, respectively. Conclusions: The results indicate that neutrophils increase myocyte reoxygenation damage, and that reoxygenated cardiac myocytes release potent neutrophil stimulants and cytotoxic mediators. The anoxia-reoxygenation induced, neutrophil mediated myocyte damage is dependent on oxygen free radicals, proteases, and cellular adhesion, and stimulation of endogenous NO production may be protective in this model. Cardiovascular Research 1994; 28 :565-569 |
| Databáze: | OpenAIRE |
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