Reports

Posttranscriptional Control in the Steroid-Mediated Induction of Hepatic Tyrosine Transaminase

See allHide authors and affiliations

Science  16 Jan 1970:
Vol. 167, Issue 3916, pp. 283-285
DOI: 10.1126/science.167.3916.283

Abstract

The purine analog azaguanine does not inhibit the initial induction of hepatic tyrosine transaminase by hydrocortisone. However, the continued induced synthesis of tyrosine transaminase, elicited by repeated doses of hydro-cortisone, is inhibited approximately 64 percent in the presence of the analog after 7 to 8 hours and appears to be almost completely inhibited by 9 to 10 hours; this suggests that the induction cycle involves the activation and renewal of a pool of preexisting messenger RNA.