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 in | Proceedings of the National Academy of Sciences - PNAS Vol. 117; no. 1; pp. 464 - 471 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
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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. |
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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 |
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Notes | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 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... |
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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 |
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