Ret is a multifunctional coreceptor that integrates diffusible- and contact-axon guidance signals.
Ret is a multifunctional coreceptor that integrates diffusible- and contact-axon guidance signals.
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DOI:
10.1016/j.cell.2012.01.024
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发表时间:
2012-02-03
期刊:
影响因子:
64.5
通讯作者:
Pfaff SL
中科院分区:
文献类型:
--
作者:
Bonanomi D;Chivatakarn O;Bai G;Abdesselem H;Lettieri K;Marquardt T;Pierchala BA;Pfaff SL
Growing axons encounter multiple guidance cues, but it is unclear how separate signals are resolved and integrated into coherent instructions for growth cone navigation. We report that glycosylphosphatidylinositol (GPI)-anchored ephrin-As function as “reverse” signaling receptors for motor axons when contacted by transmembrane EphAs present in the dorsal limb. Ephrin-A receptors are thought to depend on transmembrane co-receptors for transmitting signals intracellularly. We show that the receptor tyrosine kinase Ret is required for motor axon attraction mediated by ephrin-A reverse signaling. Ret also mediates GPI-anchored GFRα1 signaling in response to GDNF, a diffusible chemoattractant in the limb - indicating that Ret is a multifunctional co-receptor for guidance molecules. Axons respond synergistically to co-activation by GDNF and EphA ligands and these cooperative interactions are gated by GFRα1 levels. Our studies uncover a hierarchical GPI-receptor signaling network that is constructed from combinatorial components and integrated through Ret using ligand coincidence detection.
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