title: [The state of the cytochrome part of respiratory chain in tumor carrier rats' liver in the conditions of preliminary low-level irradiation].
abstract: The effect of low-level irradiation on the structural and functional organization of the cytochrome part of the respiratory chain in tumor carrier rats' liver is studied. The preliminary low-level irradiation leading to the mitochondrial cytochrome a, b and c content reduction at the latent stage of Guerin's carcinoma is shown. At the same time, the maximal reduction of the content of all liver cytochromes is observed at the terminal stages of oncogenesis. The content of cytochome c undergoes the most significant changes in the liver mitochondrial fracture. The possible mechanism of mitochondrial haem-containing cytochromes content reduction may be associated with the disorder of their formation caused by the heam synthesis inhibition found in our study. Simultaneously, the cytochrome oxydase (key enzyme of the cytochrome part) activity inhibition is observed to be caused by preliminary low-level irradiation at the latent growth stage of Guerin's carcinoma. The determined differences between irradiated and non-irradiated tumor carrier groups allow us to come to the conclusion that low-level irradiation has an impact only at the initial stages of the aftereffect. At the following stages, the state of the cytochrome part of the respiratory chain is defined by growth conditions of tumor.
authors.forename: M M
authors.initials: MM
authors.lastname: Marchenko
authors.forename: O N
authors.initials: ON
authors.lastname: Voloshchuk
mesh_terms: D000818:Animals; D017936:Cytochrome a Group / Q000378:metabolism*; D003573:Cytochrome b Group / Q000378:metabolism*; D003574:Cytochrome c Group / Q000378:metabolism*; D004579:Electron Transport / Q000528:radiation effects*; D003576:Electron Transport Complex IV / Q000378:metabolism; D008113:Liver Neoplasms / Q000532:radiotherapy; D008930:Mitochondria, Liver / Q000378:metabolism / Q000528:radiation effects; D009374:Neoplasms, Experimental / Q000532:radiotherapy; D011829:Radiation Dosage; D051381:Rats; D014965:X-Rays
chemical_list: D017936:Cytochrome a Group; D003573:Cytochrome b Group; D003574:Cytochrome c Group; D003576:Electron Transport Complex IV