title: A method for investigating hepatocyte polyploidization kinetics during postnatal development in mammals.
abstract: A method for investigating weakly-proliferating cell populations of liver parenchyma on the basis of a quantitative analysis of hepatocyte polyploidization during postnatal development is described. The method uses a mathematical model which characterizes the hepatocyte polyploidization process, and incorporates data concerning the time course for relative frequencies of hepatocytes in different ploidy classes. As a result of these measurements and calculations for rat liver, transition rates of hepatocytes (the relative number of cells during a given time unit) from one ploidy class to another, and a coefficient for the reduction of hepatocyte mitotic activity with an increase in its ploidy class were obtained. Calculated curves show a good correspondence with the real process of hepatocyte frequency changes as they relate to changes in the age of the animals. To check this method, experiments investigating time changes of autoradiographic label content in the different ploidy classes of hepatocytes were carried out. By mathematically modeling the label diluting process resulting from cell proliferation and polyploidization, transition rates of hepatocytes were calculated, and they reflect values calculated from the model according to changes in occurrence frequencies.
authors.affiliation: Institute of Cytology, Russian Academy of Sciences, St-Petersburg.
authors.forename: G I
authors.initials: GI
authors.lastname: Stein
authors.forename: B N
authors.initials: BN
authors.lastname: Kudryavtsev
mesh_terms: D000818:Animals; D002455:Cell Division / Q000502:physiology; D007700:Kinetics; D008099:Liver / Q000166:cytology / Q000502:physiology*; D008322:Mammals / Q000254:growth & development*; D008938:Mitosis / Q000502:physiology; D008954:Models, Biological; D011123:Polyploidy; D051381:Rats