Circadian rhythm of adenosine triphosphatase activity and 32P content in Pliss lymphosarcoma
Seĭtkazina, G.D.; Vasil'eva, G.S.; Efimov, M.L.; Kovalenko, V.R.
Voprosy Meditsinskoi Khimii 30(6): 38-40
1984
ISSN/ISBN: 0042-8809 PMID: 6152086 Document Number: 221945
Within a daily period maximal activity of ATPases and content of 32P in Pliss lymphosarcoma tissue was found in the samples taken at 15 or 21 p.m. and 3 a.m. The radioactivity in the tumor was minimal between 9 and 12 a.m. and 18 or 24 p.m. The alterations in Mg2+-ATPase activity in their magnitude and circadian rhythm coincided completely with the daily variations in content of radiophosphorus. Activities of Na+, K+- and HCO(3-)-ATPases exhibited maximal values at 15 p.m. and, especially between 3 and 6 a.m., i.e. these alterations were of two-peak shape without the peak at 21 p.m.