This research identifies AMPAR surface diffusion and desensitization as critical postsynaptic mechanisms that work alongside presynaptic release to regulate short-term plasticity (STP). By utilizing advanced molecular tools and imaging in intact brain circuits, the authors demonstrate that receptor mobility counteracts synaptic depression by replacing desensitized receptors with functional ones during repetitive activity. These postsynaptic dynamics are synapse-specific, appearing more influential in the somatosensory cortex than in the hippocampus due to differing receptor compositions. Furthermore, the study reveals that CaMKII signaling during long-term plasticity can dynamically tune this mobility to adjust synaptic gain. Ultimately, these findings establish that the movement of receptors at the nanoscale acts as a fundamental information filter, shaping how neuronal networks integrate and process temporal data.

References:

• Nowacka A, Getz A M, Zieger H L, et al. Synapse-specific and plasticity-regulated AMPA receptor mobility tunes synaptic integration[J]. Neuron, 2026.