Bader R, Sarraf-Zadeh L, Peters M, Moderau N, Stocker H, Köhler K, Pankratz MJ, Hafen E. The IGFBP7 homolog Imp-L2 promotes insulin signaling in distinct neurons of the Drosophila brain.
J Cell Sci 2013;
126:2571-6. [PMID:
23591813 DOI:
10.1242/jcs.120261]
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Abstract
In Drosophila, Insulin-like peptide 2 (Dilp-2) is expressed by insulin-producing cells in the brain, and is secreted into the hemolymph to activate insulin signaling systemically. Within the brain, however, a more local activation of insulin signaling may be required to couple behavioral and physiological traits to nutritional inputs. We show that a small subset of neurons in the larval brain has high Dilp-2-mediated insulin signaling activity. This local insulin signaling activation is accompanied by selective Dilp-2 uptake and depends on the expression of the Imaginal morphogenesis protein-late 2 (Imp-L2) in the target neurons. We suggest that Imp-L2 acts as a licensing factor for neuronal IIS activation through Dilp-2 to further increase the precision of insulin activity in the brain.
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