An in vivo RNAi screen uncovers the role of AdoR signaling and adenosine deaminase in controlling intestinal stem cell activity

Metabolites are increasingly appreciated for their roles as signaling molecules. To dissect the roles of metabolites, it is essential to understand their signaling pathways and their enzymatic regulations. From an RNA interference (RNAi) screen for regulators of intestinal stem cell (ISC) activity i...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 117; no. 1; pp. 464 - 471
Main Authors Xu, Chiwei, Franklin, Brian, Tang, Hong-Wen, Regimbald-Dumas, Yannik, Hu, Yanhui, Ramos, Justine, Bosch, Justin A., Villalta, Christians, He, Xi, Perrimon, Norbert
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 07.01.2020
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Abstract Metabolites are increasingly appreciated for their roles as signaling molecules. To dissect the roles of metabolites, it is essential to understand their signaling pathways and their enzymatic regulations. From an RNA interference (RNAi) screen for regulators of intestinal stem cell (ISC) activity in the Drosophila midgut, we identified adenosine receptor (AdoR) as a top candidate gene required for ISC proliferation. We demonstrate that Ras/MAPK and Protein Kinase A (PKA) signaling act downstream of AdoR and that Ras/MAPK mediates the major effect of AdoR on ISC proliferation. Extracellular adenosine, the ligand for AdoR, is a small metabolite that can be released by various cell types and degraded in the extracellular space by secreted adenosine deaminase. Interestingly, down-regulation of adenosine deaminase-related growth factor A (Adgf-A) from enterocytes is necessary for extracellular adenosine to activate AdoR and induce ISC overproliferation. As Adgf-A expression and its enzymatic activity decrease following tissue damage, our study provides important insights into how the enzymatic regulation of extracellular adenosine levels under tissue-damage conditions facilitates ISC proliferation.
AbstractList Metabolites are increasingly appreciated for their roles as signaling molecules. To dissect the roles of metabolites, it is essential to understand their signaling pathways and their enzymatic regulations. From an RNA interference (RNAi) screen for regulators of intestinal stem cell (ISC) activity in the Drosophila midgut, we identified adenosine receptor (AdoR) as a top candidate gene required for ISC proliferation. We demonstrate that Ras/MAPK and Protein Kinase A (PKA) signaling act downstream of AdoR and that Ras/MAPK mediates the major effect of AdoR on ISC proliferation. Extracellular adenosine, the ligand for AdoR, is a small metabolite that can be released by various cell types and degraded in the extracellular space by secreted adenosine deaminase. Interestingly, down-regulation of adenosine deaminase-related growth factor A (Adgf-A) from enterocytes is necessary for extracellular adenosine to activate AdoR and induce ISC overproliferation. As Adgf-A expression and its enzymatic activity decrease following tissue damage, our study provides important insights into how the enzymatic regulation of extracellular adenosine levels under tissue-damage conditions facilitates ISC proliferation.
Regulation of stem cells by microenvironment signals is important to maintain epithelial homeostasis. Using a quantitative readout, we screened for receptor genes that affect the intestinal stem cell pool size in the adult Drosophila midgut. The top candidate of our screen, AdoR , underscores the importance of purinergic signaling in controlling ISC activity. Furthermore, we identified a pivotal role of an enterocyte-derived metabolic enzyme, Adgf-A, in limiting the activity of extracellular adenosine and shaping the ISC microenvironment. Metabolites are increasingly appreciated for their roles as signaling molecules. To dissect the roles of metabolites, it is essential to understand their signaling pathways and their enzymatic regulations. From an RNA interference (RNAi) screen for regulators of intestinal stem cell (ISC) activity in the Drosophila midgut, we identified adenosine receptor ( AdoR ) as a top candidate gene required for ISC proliferation. We demonstrate that Ras/MAPK and Protein Kinase A (PKA) signaling act downstream of AdoR and that Ras/MAPK mediates the major effect of AdoR on ISC proliferation. Extracellular adenosine, the ligand for AdoR, is a small metabolite that can be released by various cell types and degraded in the extracellular space by secreted adenosine deaminase. Interestingly, down-regulation of adenosine deaminase-related growth factor A ( Adgf-A ) from enterocytes is necessary for extracellular adenosine to activate AdoR and induce ISC overproliferation. As Adgf-A expression and its enzymatic activity decrease following tissue damage, our study provides important insights into how the enzymatic regulation of extracellular adenosine levels under tissue-damage conditions facilitates ISC proliferation.
Metabolites are increasingly appreciated for their roles as signaling molecules. To dissect the roles of metabolites, it is essential to understand their signaling pathways and their enzymatic regulations. From an RNA interference (RNAi) screen for regulators of intestinal stem cell (ISC) activity in the midgut, we identified ( ) as a top candidate gene required for ISC proliferation. We demonstrate that Ras/MAPK and Protein Kinase A (PKA) signaling act downstream of AdoR and that Ras/MAPK mediates the major effect of AdoR on ISC proliferation. Extracellular adenosine, the ligand for AdoR, is a small metabolite that can be released by various cell types and degraded in the extracellular space by secreted adenosine deaminase. Interestingly, down-regulation of ( ) from enterocytes is necessary for extracellular adenosine to activate AdoR and induce ISC overproliferation. As expression and its enzymatic activity decrease following tissue damage, our study provides important insights into how the enzymatic regulation of extracellular adenosine levels under tissue-damage conditions facilitates ISC proliferation.
Significance Regulation of stem cells by microenvironment signals is important to maintain epithelial homeostasis. Using a quantitative readout, we screened for receptor genes that affect the intestinal stem cell pool size in the adult Drosophila midgut. The top candidate of our screen, AdoR , underscores the importance of purinergic signaling in controlling ISC activity. Furthermore, we identified a pivotal role of an enterocyte-derived metabolic enzyme, Adgf-A, in limiting the activity of extracellular adenosine and shaping the ISC microenvironment. Metabolites are increasingly appreciated for their roles as signaling molecules. To dissect the roles of metabolites, it is essential to understand their signaling pathways and their enzymatic regulations. From an RNA interference (RNAi) screen for regulators of intestinal stem cell (ISC) activity in the Drosophila midgut, we identified adenosine receptor ( AdoR ) as a top candidate gene required for ISC proliferation. We demonstrate that Ras/MAPK and Protein Kinase A (PKA) signaling act downstream of AdoR and that Ras/MAPK mediates the major effect of AdoR on ISC proliferation. Extracellular adenosine, the ligand for AdoR, is a small metabolite that can be released by various cell types and degraded in the extracellular space by secreted adenosine deaminase. Interestingly, down-regulation of adenosine deaminase-related growth factor A ( Adgf-A ) from enterocytes is necessary for extracellular adenosine to activate AdoR and induce ISC overproliferation. As Adgf-A expression and its enzymatic activity decrease following tissue damage, our study provides important insights into how the enzymatic regulation of extracellular adenosine levels under tissue-damage conditions facilitates ISC proliferation.
Author Bosch, Justin A.
Villalta, Christians
He, Xi
Franklin, Brian
Hu, Yanhui
Xu, Chiwei
Perrimon, Norbert
Ramos, Justine
Tang, Hong-Wen
Regimbald-Dumas, Yannik
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Keywords adenosine receptor
RNAi screen
intestinal stem cell
adenosine deaminase
Language English
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Author contributions: C.X. and N.P. designed research; C.X., B.F., H.-W.T., Y.R.-D., and J.R. performed research; J.A.B. and C.V. contributed new reagents/analytic tools; C.X., Y.R.-D., Y.H., X.H., and N.P. analyzed data; and C.X. and N.P. wrote the paper.
Reviewers: U.B., University of California, Los Angeles; and H.J., Buck Institute for Research on Aging.
Contributed by Norbert Perrimon, November 15, 2019 (sent for review January 9, 2019; reviewed by Utpal Bannerjee and Heinrich Jasper)
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Snippet Metabolites are increasingly appreciated for their roles as signaling molecules. To dissect the roles of metabolites, it is essential to understand their...
Significance Regulation of stem cells by microenvironment signals is important to maintain epithelial homeostasis. Using a quantitative readout, we screened...
Regulation of stem cells by microenvironment signals is important to maintain epithelial homeostasis. Using a quantitative readout, we screened for receptor...
SourceID pubmedcentral
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jstor
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StartPage 464
SubjectTerms Adenosine
Adenosine - metabolism
Adenosine deaminase
Adenosine Deaminase - metabolism
Animals
Animals, Genetically Modified
Biological Sciences
Cell Differentiation
Cell Proliferation
Damage
Down-Regulation
Downstream effects
Drosophila
Drosophila Proteins - genetics
Drosophila Proteins - metabolism
Enterocytes
Enterocytes - physiology
Enzymatic activity
Fruit flies
Gene expression
Gene Knock-In Techniques
Gene Knockdown Techniques
Growth factors
Intestine
Kinases
MAP kinase
MAP Kinase Signaling System - genetics
Metabolites
Midgut
Multipotent Stem Cells - physiology
Protein kinase A
Ras protein
Receptors, Purinergic P1 - genetics
Receptors, Purinergic P1 - metabolism
RNA Interference
RNA-mediated interference
Signaling
Stem cells
Title An in vivo RNAi screen uncovers the role of AdoR signaling and adenosine deaminase in controlling intestinal stem cell activity
URI https://www.jstor.org/stable/26897485
https://www.ncbi.nlm.nih.gov/pubmed/31852821
https://www.proquest.com/docview/2335154113/abstract/
https://search.proquest.com/docview/2328759560
https://pubmed.ncbi.nlm.nih.gov/PMC6955304
Volume 117
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