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The Class I Alcohol Dehydrogenase Gene Is Glucocorticoid‐Responsive in the Rat Hepatoma Microcell Hybrid Cell Line, 11–3
Author(s) -
Majewski Jessica L.,
Yang Vincent W.
Publication year - 1995
Publication title -
alcoholism: clinical and experimental research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.267
H-Index - 153
eISSN - 1530-0277
pISSN - 0145-6008
DOI - 10.1111/j.1530-0277.1995.tb01003.x
Subject(s) - glucocorticoid , biology , gene expression , alcohol dehydrogenase , cell culture , messenger rna , dexamethasone , medicine , gene , endocrinology , steroid hormone , microbiology and biotechnology , complementary dna , hormone , enzyme , biochemistry , genetics
Expression of the class I alcohol dehydrogenase (ADH) gene in the rat hepatoma microcell hybrid cell line, 11–3, was examined. The steady‐state level of ADH mRNA in 11–3 was ∼2‐fold higher than that of rat liver and Fao, the parental cell line of 11–3. Removal of steroid hormones by activated charcoal from the serum in which 11–3 cells were maintained resulted in a significant decrease in the level of ADH transcript. Dexamethasone at a concentration of 1 μM increased the ADH mRNA content in 11–3 in a time‐dependent fashion, up to 48 hr after its addition to cells that had first been deprived of steroid hormones. In addition, levels of ADH transcript in cells treated with dexamethasone increased in a dose‐dependent manner, and the concentration of dexamethasone required to achieve half‐maximal activation was 5 nM. By using the techniques of reverse transcription and polymerase chain reaction, and by taking advantage of a restriction polymorphism present between the rat and mouse ADH cDNA, we found that 11–3 contained both the rat and mouse class I ADH transcripts, although the rat sequence accounted for the great majority. Moreover, levels of both rat and mouse class I ADH transcripts increased in a similarly time‐dependent manner in cells treated with dexamethasone. These results indicate that expression of class I ADH gene in 11–3 is high and is regulated by glucocorticoids, making the cell line an excellent model for the in vitro study of ADH expression.