Publications by authors named "J Wutzen"

Intraperitoneal cyclophosphamide administration to a total dose of 225 mg/kg body weight during six weeks produced in rat myocardial fibres evident focal degenerative changes in all organelles, and, fairly frequently, significant damage even up to necrosis. The experiment showed that in rats on low-magnesium diet cyclophosphamide produced more intense and more extensive changes than in rats receiving only cyclophosphamide. The extent of the lesions produced with low and high doses of cyclophosphamide was compared and it was observed that the lesions increased with an enlargement of doses of the drug.

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Cyclophosphamide administration in 20 mg/kg doses intraperitoneally at intervals of 6 days for 6 weeks produced the appearance of slight focal changes in myocardial fibres from the third week on, with dilatation of T-tubules and smooth endoplasmic reticulum channels with electron-dense deposits in them, with the appearance of numerous fat droplets in myocardial fibres, slight mitochondrial changes, with swelling and the appearance of giant or bizarre shaped mitochondria with electron-dense granules and lamellae in them, with numerous lysosomes and some increase in the number of autophagosomes, focal widening of intercalated discs, lysis of myofilaments and myofibrils, cytoplasm swelling, focal necrosis of some myocardial fibres in the 6th week of the experiment, marked swelling of vascular endothelial cells, and a very great rise in the number of collagen fibres. Simultaneous administration of low-magnesium diet and cyclophosphamide caused a greater intensity and an earlier appearance from the 2nd week on, of the disseminated degenerative and necrotic changes in myocardial fibres.

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Methotrexate administration intraperitoneally in doses of 1 mg/kg body weight twice weekly for six weeks produced in the myocardial fibres of these animals slight focal lesions from the third week of the experiment on with the appearance of isolated giant mitochondria of bizarre shapes with electron-dense membranes containing granules, or groups of mitochondria with swollen matrix and disintegration or, partial breakdown of mitochondrial cristae, numerous lysosomes and less numerous autophagosomes, considerable lysis of myofibrils and myofilaments, widening of the tubules of the sarcoplasmic reticulum and T-tubules, presence of few fat droplets, widening of intercalated discs, rarely cytoplasm swelling. From the fifth week on foci of cardiomyocyte fibrosis, in some places swelling of vascular endothelial cells, and a very considerable rise in the number of collagen cells in extracellular spaces. Simultaneous low-magnesium diet and methotrexate caused earlier, from the second week on, and greater intensity of focal necrotic and degenerative changes of cardiomyocytes.

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The aim of the study was to investigate the mechanisms of myocardial lesions induced by stress in conscious, intact pigs. The animals were subjected to 24 h immobilization, controls were kept in normal conditions. The pigs were killed by electric shock and exsanguination.

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Methotrexate administration in 1 mg/kg doses intraperitoneally twice weekly for six weeks caused in rat myocardium the following focal, not very intense, histological and histochemical changes from the third week of the experiment on: focal increasing eosinophilia and fuchsinophilia of myocyte cytoplasm, undulating shape of myocardial fibres, contraction nodes, in the sixth week small necrotic foci with associated infiltrations composed of mononuclear cells, presence of p.a.S.

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