CREB activates the MafA promoter through proximal E-boxes and a CCAAT motif in pancreatic β-cells

in Journal of Molecular Endocrinology
Authors:
Yuki Aida Laboratory of Molecular Medical Bioscience, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan

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Kohsuke Kataoka Laboratory of Molecular Medical Bioscience, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan

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https://orcid.org/0000-0001-5685-3908

Correspondence should be addressed to K Kataoka: kkataoka@yokohama-cu.ac.jp
DOI:
https://doi.org/10.1530/JME-24-0023
Volume/Issue:
Volume 73: Issue 3
Article Type:
Research Article
Article ID:
e240023
Online Publication Date:
04 Oct 2024
Copyright:
© the author(s) 2024
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MafA is a key transcriptional regulator of pancreatic islet β-cell function. Its target genes include those encoding preproinsulin and the glucose transporter Glut2 (Slc2a2); thus, MafA function is essential for glucose-stimulated insulin secretion. Expression levels of MafA are reduced in β-cells of diabetic mouse models and human subjects, suggesting that β-cell dysfunction associated with type 2 diabetes is attributable to the loss of MafA. On the other hand, MafA is transcriptionally upregulated by incretin hormones through activation of CREB and its co-activator CRTC2. β-cell-specific expression of MafA relies on a distal enhancer element. However, the precise mechanism by which CREB-CRTC2 regulates the enhancer and proximal promoter regions of MafA remains unclear. In this report, we analyzed previously published ChIP-seq data and found that CREB and NeuroD1, a β-cell-enriched transactivator, bound to both the promoter and enhancer regions of human MAFA. A series of reporter assays revealed that CREB activated the enhancer through a conserved cAMP-responsive element (CRE) but stimulated MAFA promoter activity even when the putative CRE was deleted. Two E-box elements and a CCAAT motif, which bind NeuroD1 and ubiquitous NF-Y transcription factors, respectively, were necessary for transcriptional activation of the MAFA promoter by CREB. Genome-wide analysis of CREB-bound loci in β-cells revealed that they were enriched with CCAAT motifs. Furthermore, promoter analysis of the Isl1 gene encoding a β-cell-enriched transcription factor revealed that a CRE-like element and two CCAAT motifs, but not the E-box, were necessary for activation by CREB. These results provide clues to elucidate the detailed mechanism by which CREB regulates MafA as well as β-cell-specific genes.

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Online ISSN:
1479-6813
Print ISSN:
0952-5041
Copyright:
© the author(s) 2024
Article ID:
e240023
Article Type:
Research Article
Received Date:
09 Mar 2024
Accepted Date:
27 Aug 2024
Print Publication Date:
01 Oct 2024
Online Publication Date:
04 Oct 2024
Keywords:
CREB1; gene regulation; MafA; pancreatic β-cell

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