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Citation
Rajan, A., Housden, B.E., Wirtz-Peitz, F., Holderbaum, L., Perrimon, N. (2017). A Mechanism Coupling Systemic Energy Sensing to Adipokine Secretion.  Dev. Cell 43(1): 83--98.e6.
FlyBase ID
FBrf0236912
Publication Type
Research paper
Abstract

Adipocytes sense systemic nutrient status and systemically communicate this information by releasing adipokines. The mechanisms that couple nutritional state to adipokine release are unknown. Here, we investigated how Unpaired 2 (Upd2), a structural and functional ortholog of the primary human adipokine leptin, is released from Drosophila fat cells. We find that Golgi reassembly stacking protein (GRASP), an unconventional secretion pathway component, is required for Upd2 secretion. In nutrient-rich fat cells, GRASP clusters in close proximity to the apical side of lipid droplets (LDs). During nutrient deprivation, glucagon-mediated increase in calcium (Ca(2+)) levels, via calmodulin kinase II (CaMKII) phosphorylation, inhibits proximal GRASP localization to LDs. Using a heterologous cell system, we show that human leptin secretion is also regulated by Ca(2+) and CaMKII. In summary, we describe a mechanism by which increased cytosolic Ca(2+) negatively regulates adipokine secretion and have uncovered an evolutionarily conserved molecular link between intracellular Ca(2+) levels and energy homeostasis.

Graphical Abstract
Obtained with permission from Cell Press.
PubMed ID
PubMed Central ID
PMC5650192 (PMC) (EuropePMC)
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Secondary IDs
    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    Dev. Cell
    Title
    Developmental Cell
    Publication Year
    2001-
    ISBN/ISSN
    1534-5807 1878-1551
    Data From Reference