| Abstract: | Rat hepatocytes taken a different stages of the perinatal period were partially purified. On sodium dodecylsulphate acrylamide electrophoresis chromosomal non-histone proteins showed important variations in complexity during development. Chromosomal phosvitin kinase strongly increased during the last days of fetal life; it strongly decreased just after birth and increased again for a short time, while the cytosol phosvitin kinase increased more significantly after birth. Chromosomal non-histone proteins prepared at varoius stages were incubated with gamma-32P]ATP and resolved on polyacrylamide gel. The incorporation was very low in sample taken at the 15th say of the fetal life. A dramatic increase was observed at the 17th day. This incorporation strongly decreased in the samples taken thereafter and it was negligible in proteins from adult rats. The variations in protein kinase and in 32P incorporation into non-histone proteins were correlated with the pattern of appearance of enzymes in this period of life, with cell growth and with the hormone-induced maturation. |
