Hippo, TGF-β, and Src-MAPK pathways regulate transcription of the upd3 cytokine in Drosophila enterocytes upon bacterial infection.
Résumé
Cytokine signaling is responsible for coordinating conserved epithelial regeneration and immune responses in the digestive tract. In the Drosophila midgut, Upd3 is a major cytokine, which is induced in enterocytes (EC) and enteroblasts (EB) upon oral infection, and initiates intestinal stem cell (ISC) dependent tissue repair. To date, the genetic network directing upd3 transcription remains largely uncharacterized. Here, we have identified the key infection-responsive enhancers of the upd3 gene and show that distinct enhancers respond to various stresses. Furthermore, through functional genetic screening, bioinformatic analyses and yeast one-hybrid screening, we determined that the transcription factors Scalloped (Sd), Mothers against dpp (Mad), and D-Fos are principal regulators of upd3 expression. Our study demonstrates that upd3 transcription in the gut is regulated by the activation of multiple pathways, including the Hippo, TGF-β/Dpp, and Src, as well as p38-dependent MAPK pathways. Thus, these essential pathways, which are known to control ISC proliferation cell-autonomously, are also activated in ECs to promote tissue turnover the regulation of upd3 transcription
Mots clés
DBG
EQYY
Animals
Female
Drosophila Proteins
Cell Proliferation
Signal Transduction
Male
Transcription Factors
Drosophila
Intestines
Protein-Serine-Threonine Kinases
Gene Expression Regulation
Pseudomonas
Gene Regulatory Networks
Bacterial Infections
Intracellular Signaling Peptides and Proteins
MAP Kinase Signaling System
Stem Cells
Enterocytes
Pectobacterium carotovorum
Transforming Growth Factor beta