Figure 4
From: Role of NMDA receptor subtypes in different forms of NMDA-dependent synaptic plasticity
Roles of NR2B and NR2A subunits in LTP. (A) LTP induced by three successive tetani (100 Hz, 100 impulses each) in normal solution. The EPSP is potentiated to a near doubling of the initial response. Test pathway (black symbols) and control pathway (gray symbols) are plotted as functions of time, each point indicating the average in 1 min (n = 10 experiments). (B) LTP is partially blocked by Ro25-6981 (0.5 μM; n = 2)/Ifenprodil (3 μM; n = 4) (total n = 6). (C) LTP is fully prevented when NVP-AAM077 (0.4 μM) is present (n = 5). (D) Bar diagram summarizes the data in A-C with mean ± S.E.M. LTP is measured at 60 min after tetanization relative to the initial baseline. Arrows in A-C indicate the tetani. Black bars indicate the duration of drug application. Inserts illustrate EPSP-traces taken at the indicated time points (a, b). Calibrations: 0.5 mV, 20 ms.