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. 1993 Jun;13(6):3588–3597. doi: 10.1128/mcb.13.6.3588

A GC-rich domain with bifunctional effects on mRNA and protein levels: implications for control of transforming growth factor beta 1 expression.

L Scotto 1, R K Assoian 1
PMCID: PMC359828  PMID: 8497272

Abstract

Chimeric plasmids containing selected reporter coding domains and portions of the transforming growth factor beta 1 (TGF-beta 1) 3' untranslated region (UTR) were prepared and used to identify potential mechanisms involved in regulating the biosynthesis of TGF-beta 1. Transient transfections with core and chimeric constructs containing the chloramphenicol acetyltransferase (CAT) reporter showed that steady-state CAT mRNA levels were decreased two- to threefold in response to the TGF-beta 1 3' UTR. Interestingly, CAT activity was somewhat increased in the same transfectants. Thus, production of CAT protein per unit of mRNA was stimulated by the TGF-beta 1 3' UTR (approximately fourfold in three cell lines of distinct lineage). The translation-stimulatory effect of the TGF-beta 1 3' UTR suggested by these studies in vivo was confirmed in vitro by cell-free translation of core and chimeric transcripts containing the growth hormone coding domain. These studies showed that production of growth hormone was stimulated threefold by the TGF-beta 1 3' UTR. A deletion analysis in vivo indicated that the GC-rich domain in the TGF-beta 1 3' UTR was responsible for both the decrease in mRNA levels and stimulation of CAT activity-mRNA. We conclude that this GC-rich domain can have a bifunctional effect on overall protein expression. Moreover, the notable absence of this GC-rich domain in TGF-beta 2, TGF-beta 3, TGF-beta 4, and TGF-beta 5 indicates that expression of distinct TGF-beta family members can be differentially controlled in cells.

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