Activation of p 75 NTR by proBDNF facilitates hippocampal long-term depression

Proand mature brain-derived neurotrophic factor (BDNF) activate two distinct receptors: p75 neurotrophin receptor (p75NTR) and TrkB. Mature BDNF facilitates hippocampal synaptic potentiation through TrkB. Here we report that proBDNF, by activating p75NTR, facilitates hippocampal long-term depression (LTD). Electron microscopy showed that p75NTR localized in dendritic spines, in addition to afferent terminals, of CA1 neurons. Deletion of p75NTR in mice selectively impaired the NMDA receptor–dependent LTD, without affecting other forms of synaptic plasticity. p75NTR2/2 mice also showed a decrease in the expression of NR2B, an NMDA receptor subunit uniquely involved in LTD. Activation of p75NTR by proBDNF enhanced NR2B-dependent LTD and NR2B-mediated synaptic currents. These results show a crucial role for proBDNF-p75NTR signaling in LTD and its potential mechanism, and together with the finding that mature BDNF promotes synaptic potentiation, suggest a bidirectional regulation of synaptic plasticity by proBDNF and mature BDNF.

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