Administration of 3-methylcholanthrene to Rats Increases the Specific Hybridizable MRNA Coding for Cytochrome P-450c

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1981 Jul 1

PMID 6945571

Citations 8

Authors

E BRESNICK

M BROSSEAU

W Levin

L Reik

D E Ryan

P E Thomas

Affiliations

Soon will be listed here.

Abstract

Poly(A)+-RNA obtained from the livers of 3-methylcholanthrene (3MC)-treated rats was translated into cytochrome P-450c in a cell-free reticulocyte system. In this translational system, no precursor cytochrome P-450c was observed. The mRNA responsible for the synthesis of this cytochrome was isolated by immunoprecipitation of liver polyribosomes obtained at 15 hr after 3MC treatment, and a cDNA was constructed by the reverse transcriptase reaction. The cDNA was further purified by hybridizing at a high R0t (product of RNA concentration and incubation time) to poly(A)+-RNA isolated from control rat liver, and the nonhybridized, single-stranded cDNA was isolated by hydroxylapatite chromatography. This cDNAp-450c was employed in hybridization reactions with poly(A)+-RNA isolated from the livers of rats treated with 3MC for various times. These studies indicated a maximal induction of mRNAp-450c at about 15 hr after 3MC injection, although levels of this mRNA were significantly increased by 7 hr. The mRNAp-450c concentration had diminished by 24 hr but remained higher than control levels for at least 48 hr. These studies establish an effect of 3MC upon the accumulation of mRNAp-450c in rat liver.

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