Some aspects of glycosylation in rat liver during pregnancy. Issue 5 (October 1989)

• Record Type: Journal Article
• Authors: Marino, M.; Leoni, S.; Spagnuolo, S.; Devirgiliis, L. Conti; Mangiantini, M. T.
• Is Part Of: Bioscience reports. Volume 9:Issue 5(1989)
• Page Start: 565
• Page End: 572
• Publication Date: 1989-10
• Subjects: glycoprotein -- dolichol -- glycosyl transferase -- liver -- pregnancy; Molecular biology -- Periodicals; Cytology -- Periodicals; 572.8
• DOI: 10.1007/BF01119799
• Languages: English
• ISSNs: 0144-8463

Abstract

Abstract : The aim of the present report was to analyze the pattern of glycoprotein synthesis in rat liver on 19th and 22nd day of pregnancy by following the incorporation of 14 C-glucosamine and 3 H-galactose into isolated rat hepatocytes, the N-acetylglucosaminyl-1-P and galactosyl transferase activities, and the liver content of dolichol and dolichyl-phosphate. The data obtained show a decrease of precursor incorporation into glycoproteins during the last period of pregnancy; this decrease is independent of enzyme activities. The dolichol content increases and the dolichyl-phosphate content, usually considered as rate limiting for glycosylation, decreases. These results, present in other conditions of proliferation and differentiation of rat liver, could explain the differences in membrane organization, the increase of hepatic proteolysis and the alteration in secretory activity during the last phase of gestation.