Related Experiment Video
Updated: Aug 13, 2026

A High Resolution Method to Monitor Phosphorylation-dependent Activation of IRF3
Published on: January 24, 2016
Sp1 is required for prolactin activation of the interferon regulatory factor-1 gene
M Book McAlexander1, L Y Yu-Lee
1Department of Molecular and Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.
Abstract:
Transcription of the interferon regulatory factor-1 gene (IRF-1) is induced in a biphasic manner (G1 and G1/S phase) in Nb2 T cells in response to prolactin (PRL) stimulation. Signal transducer and activator of transcription 1 (Stat1) is required for PRL activation of the IRF-1 promoter. Mutation of a -200 bp Sp1 site in the IRF-1 promoter results in a loss of G1 but not G1/S IRF-1 transcriptional activity in response to PRL. These studies illustrate that the temporal transcription of the IRF-1 gene is mediated by not only Stat1 but also Sp1 in response to PRL stimulation.
Related Concept Videos
Regulation of the Unfolded Protein Response
General Transcription Factors
The JAK-STAT Signaling Pathway
TGF - β Signaling Pathway
Inhibitors of Viral Protein Synthesis

