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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Comparative clinical pathology 5 (1995), S. 183-188 
    ISSN: 1433-2981
    Schlagwort(e): Amitosis ; Haemopoiesis ; Liver ; Urodeles ; Morpho-cytochemistry ; Erythrocytes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The liver haemopoietic activity of three species of Urodeles (Triturus carnifex, Triturus alpestris and Speleomantes ambrosii) was examined by morphocytochemical approaches (light and electron microscopy, anti-BrdU immunocytochemistry, flow cytometry). The proliferation of haemopoietic cells, detected by the anti-BrdU labelling index, was accompanied by absence of mitotic cell division and the appearance of cells showing features of amitosis (e.g. nuclear constrictions with bundles of electron-dense chromatin) sometime positive to the anti-BrdU immuno-gold reaction. The possible unbalanced segregation of chromatin during the direct division of the nucleus was detected by flow cytometric measurement in terms of heterogeneous relative DNA content in peripheral blood cells. The presence in the bloodstream samples of cells (erythrocytes) with replicating DNA, nuclear constrictions and binucleations is also consistent with a situation of direct nuclear division.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1433-7339
    Schlagwort(e): Chemotherapy Melatonin ; Myelosuppression ; Toxicity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Experimental data have suggested that the pineal hormone melatonin (MLT) may counteract chemotherapy-induced myelosuppression and immunosuppression. In addition, MLT has been shown to inhibit the production of free radicals, which play a part in mediating the toxicity of chemotherapy. A study was therefore performed in an attempt to evaluate the influence of MLT on chemotherapy toxicity. The study involved 80 patients with metastatic solid tumors who were in poor clinical condition (lung cancer: 35; breast cancer: 31; gastrointestinal tract tumors: 14). Lung cancer patients were treated with cisplatin and etoposide, breast cancer patients with mitoxantrone, and gastrointestinal tract tumor patients with 5-fluorouracil plus folates. Patients were randomised to receive chemotherapy alone or chemotherapy plus MLT (20 mg/day p.o. in the evening). Thrombocytopenia was significantly less frequent in patients concomitantly treated with MLT. Malaise and asthenia were also significantly less frequent in patients receiving MLT. Finally, stomatitis and neuropathy were less frequent in the MLT group, albeit without statistically significant differences. Alopecia and vomiting were not influenced by MLT. This pilot study seems to suggest that the concomitant administration of the pineal hormone MLT during chemotherapy may prevent some chemotherapy-induced side-effects, particularly myelosuppression and neuropathy. Evaluation of the impact of MLT on chemotherapy efficacy will be the aim of future clinical investigations.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1433-7339
    Schlagwort(e): Key words Chemotherapy ; Melatonin ; Myelosuppression ; Toxicity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Experimental data have suggested that the pineal hormone melatonin (MLT) may counteract chemotherapy-induced myelosuppression and immunosuppression. In addition, MLT has been shown to inhibit the production of free radicals, which play a part in mediating the toxicity of chemotherapy. A study was therefore performed in an attempt to evaluate the influence of MLT on chemotherapy toxicity. The study involved 80 patients with metastatic solid tumors who were in poor clinical condition (lung cancer: 35; breast cancer: 31; gastrointestinal tract tumors: 14). Lung cancer patients were treated with cisplatin and etoposide, breast cancer patients with mitoxantrone, and gastrointestinal tract tumor patients with 5-fluorouracil plus folates. Patients were randomised to receive chemotherapy alone or chemotherapy plus MLT (20 mg/day p.o. in the evening). Thrombocytopenia was significantly less frequent in patients concomitantly treated with MLT. Malaise and asthenia were also significantly less frequent in patients receiving MLT. Finally, stomatitis and neuropathy were less frequent in the MLT group, albeit without statistically significant differences. Alopecia and vomiting were not influenced by MLT. This pilot study seems to suggest that the concomitant administration of the pineal hormone MLT during chemotherapy may prevent some chemotherapy-induced side-effects, particularly myelosuppression and neuropathy. Evaluation of the impact of MLT on chemotherapy efficacy will be the aim of future clinical investigations.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1433-2981
    Schlagwort(e): Apoptosis ; Blood cells ; Hepatic haemopoiesis ; Hibernation ; Urodeles
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Morphocytochemical correlation between proliferation (BrdU uptake) of the haemopoietic liver subcapsular tissue and peripheral blood cell characteristics was performed during active (summer) and hibernating (winter) periods in two Urodele species: Triturus carnifex and Triturus alpestris. The significant decrease of the haemopoietic cell proliferation during the hibernation was accompanied by some modifications both at erythrocyte and leucocyte level. This situation was primarily characterised by a hypofunctionality and ageing of these cells with the disappearance of immature elements from the circulation and cell loss by apoptotic mechanisms. The results indicate that the condition of low metabolism during the winter period in these Urodeles involved deep changes in the physiology of haemopoietic tissue and blood circulating cells.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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