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. 1985 Sep;5(9):2443–2453. doi: 10.1128/mcb.5.9.2443

Hormonally mediated negative regulation of human pro-opiomelanocortin gene expression after transfection into mouse L cells.

A Israel, S N Cohen
PMCID: PMC366972  PMID: 3016528

Abstract

We report results indicating that expression and hormonally controlled negative regulation of the human pro-opiomelanocortin (POMC) gene in mouse fibroblasts can be accomplished by the placement nearby of a simian virus 40 enhancer sequence. Expression resulting from correctly initiated transcription required the enhancer in cis both in cells stably transfected with the POMC gene and in a transient expression assay with constructs that fused that POMC promoter region to the protein-coding region of the herpes simplex virus thymidine kinase (TK) gene. Negative regulation of POMC transcription by glucocorticoids was demonstrated in transiently infected cells by assaying for TK activity encoded by the POMC-TK fusion constructs and by quantitative S1 nuclease mapping. The sequences responsible for such regulation were shown to be contained within a DNA segment that extends 670 base pairs upstream from the cap site for POMC mRNA.

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