6533b821fe1ef96bd127b8cf
RESEARCH PRODUCT
Direct Sensing of Nutrients via a LAT1-like Transporter in Drosophila Insulin-Producing Cells
Flore GeillonFlore GeillonFlore GeillonAnna B. ZieglerAnna B. ZieglerAnna B. ZieglerGérard ManiereGérard ManièreGérard ManièreDavid E. FeatherstoneYaël GrosjeanYael GrosjeanYael Grosjeansubject
0301 basic medicineAmino Acid Transport Systemsheavy-chainmedicine.medical_treatmentInsulinsamino acid transporter0302 clinical medicinegenetics [Drosophila Proteins]cytology [Drosophila melanogaster]Glutamate DehydrogenaseHemolymphInsulin-Secreting Cellsmetabolism [Drosophila melanogaster]HemolymphDrosophila;Drosophila insulin-like peptides;amino acid transporter;food;glutamate dehydrogenase;glycemia;growth;insulin-producing cells;minidiscs;starvationDrosophila ProteinsProtein Isoformsmetabolism [Calcium]genetics [Insulins]genetics [Amino Acid Transport Systems]lcsh:QH301-705.5minidiscsGene knockdowncytology [Larva]pancreatic beta-cellglutamate dehydrogenaseBrainmetabolism [Hemolymph]secretionDrosophila melanogasterBiochemistryLarvaAlimentation et NutritionDrosophilaLeucineSignal Transductionglucose-transportgenetics [Glutamate Dehydrogenase]genetics [Protein Isoforms]growthamino-acidsmetabolism [Drosophila Proteins][SDV.BC]Life Sciences [q-bio]/Cellular BiologyNutrient sensingmetabolism [Larva]Biologyinsulin-producing cellsArticleGeneral Biochemistry Genetics and Molecular Biologymetabolism [Amino Acid Transport Systems]metabolism [Insulins]03 medical and health sciencesLeucineparasitic diseasesmedicineFood and NutritionAnimalsddc:610cytology [Insulin-Secreting Cells]cardiovascular diseasesAmino acid transporterMnd protein Drosophilaadministration & dosage [Leucine]metabolism [Protein Isoforms]Ilp5 protein Drosophilacytology [Brain]foodGlutamate dehydrogenaseInsulinNeurosciencesstarvationGlucose transportermetabolism [Insulin-Secreting Cells]glutamate-dehydrogenasel-leucineglycemia030104 developmental biologyGene Expression Regulationlcsh:Biology (General)metabolism [Brain]metabolism [Glutamate Dehydrogenase]Neurons and Cognitionmetabolism [Leucine]CalciumDrosophila insulin-like peptidesmetabolismfat-cells030217 neurology & neurosurgerydescription
Summary Dietary leucine has been suspected to play an important role in insulin release, a hormone that controls satiety and metabolism. The mechanism by which insulin-producing cells (IPCs) sense leucine and regulate insulin secretion is still poorly understood. In Drosophila, insulin-like peptides (DILP2 and DILP5) are produced by brain IPCs and are released in the hemolymph after leucine ingestion. Using Ca2+-imaging and ex vivo cultured larval brains, we demonstrate that IPCs can directly sense extracellular leucine levels via minidiscs (MND), a leucine transporter. MND knockdown in IPCs abolished leucine-dependent changes, including loss of DILP2 and DILP5 in IPC bodies, consistent with the idea that MND is necessary for leucine-dependent DILP release. This, in turn, leads to a strong increase in hemolymph sugar levels and reduced growth. GDH knockdown in IPCs also reduced leucine-dependent DILP release, suggesting that nutrient sensing is coupled to the glutamate dehydrogenase pathway.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-09-01 | Cell Reports |