Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: UNIPROT:P01275 (
glucagon
)
26,492
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
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.
...
PMID:A Mechanism Coupling Systemic Energy Sensing to Adipokine Secretion. 2901 32
