Abstract
While Trk receptors can be activated in a neurotrophin-independent manner through "transactivation" by GPCR ligands, its physiological significance in the brain remains unknown. Huang et al. have now identified a novel mechanism of TrkB transactivation. They show that zinc ions can transactivate TrkB independent of neurotrophins and that such a transactivation is important for mossy fiber long-term potentiation (LTP).
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