Title : Modifications of hepatic alpha-1-acid glycoprotein and albumin gene expression in rats treated with phenobarbital.

Pub. Date : 1992 Feb 1

PMID : 1735448






10 Functional Relationships(s)
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1 The serum level of alpha 1-acid glycoprotein (alpha 1-AGP) is significantly increased in various animal species by treatment with cytokines, glucocorticoids and phenobarbital. Phenobarbital orosomucoid 1 Rattus norvegicus
2 The serum level of alpha 1-acid glycoprotein (alpha 1-AGP) is significantly increased in various animal species by treatment with cytokines, glucocorticoids and phenobarbital. Phenobarbital orosomucoid 1 Rattus norvegicus
3 The main purpose of this study was to assess whether phenobarbital acts on alpha 1-AGP synthesis in the liver at the transcriptional or translational level. Phenobarbital orosomucoid 1 Rattus norvegicus
4 The analysis of total hepatic RNA showed that a single injection of phenobarbital induced an 11-fold increase in phenobarbital-dependent cytochrome P450IIB mRNA, whereas seven injections of phenobarbital were required to induce a maximum 5.5-fold increase in alpha 1-AGP mRNA. Phenobarbital orosomucoid 1 Rattus norvegicus
5 The analysis of total hepatic RNA showed that a single injection of phenobarbital induced an 11-fold increase in phenobarbital-dependent cytochrome P450IIB mRNA, whereas seven injections of phenobarbital were required to induce a maximum 5.5-fold increase in alpha 1-AGP mRNA. Phenobarbital orosomucoid 1 Rattus norvegicus
6 The analysis of total hepatic RNA showed that a single injection of phenobarbital induced an 11-fold increase in phenobarbital-dependent cytochrome P450IIB mRNA, whereas seven injections of phenobarbital were required to induce a maximum 5.5-fold increase in alpha 1-AGP mRNA. Phenobarbital orosomucoid 1 Rattus norvegicus
7 Hepatocytes isolated after the seventh injection of phenobarbital showed a threefold increased capacity to secrete alpha 1-AGP, corresponding to a 3.2-fold increased alpha 1-AGP mRNA content in the liver. Phenobarbital orosomucoid 1 Rattus norvegicus
8 Hepatocytes isolated after the seventh injection of phenobarbital showed a threefold increased capacity to secrete alpha 1-AGP, corresponding to a 3.2-fold increased alpha 1-AGP mRNA content in the liver. Phenobarbital orosomucoid 1 Rattus norvegicus
9 In conditions in which its effect on the induction of alpha 1-AGP synthesis was maximum, phenobarbital caused a 30% reduction in liver albumin mRNA and in albumin secretion by isolated hepatocytes, resulting from a 60-70% reduction in the rate of transcription of the albumin gene measured in isolated nuclei. Phenobarbital orosomucoid 1 Rattus norvegicus
10 We conclude that the effect of phenobarbital on alpha 1-AGP and albumin gene expression occurs at the transcriptional rather than the translational level. Phenobarbital orosomucoid 1 Rattus norvegicus