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. 2015 Mar 26;5:9493. doi: 10.1038/srep09493

Figure 5. NMDA receptor antagonists, D-AP5 blocked the role of nicotine on γ oscillations.

Figure 5

(A1–C1) The effects of 10 μM D-AP5 on 1 μM nicotine's role on γ. (A1): Representative extracellular recordings of field potentials in the presence of KA (200 nM) alone, KA + D-AP5 (10 μM) and KA + D-AP5 + NIC (1 μM). (B1): The power spectra of field potentials corresponding to the conditions shown in A1. (C1): Time course shows the changes in γ power before and after application of NIC in the presence of D-AP5. A2-B2: The effects of 10 μM D-AP5 on 10 μM nicotine's role on γ. (A2): Representative extracellular recordings of field potentials in the presence of KA alone, KA + D-AP5 (10 μM) and KA + D-AP5 + NIC (10 μM). (B2): The power spectra of field potentials corresponding to the conditions shown in A2. (A3–B3) The effects of 10 μM AP5 on 100 μM nicotine's role on γ. (A3): Representative extracellular recordings of field potentials in the presence of KA, KA + D-AP5 (10 μM) and KA + D-AP5 + NIC (100 μM). (B3): The power spectra of field potentials corresponding to the conditions shown in A3. (D): The bar graph summarizes the percent changes in γ power before (gray bars) and after various concentrations of nicotine (1–100 μM) in the presence of 10 μM D-AP5. 10 μM D-AP5 had no effect on γ oscillations (shallow dark bars) and the subsequent application of 1 μM nicotine had no significant effect on γ power (n = 17, black bars). 10 μM D-AP5 also blocked the roles of higher concentrations of nicotine (10 μM, n = 12; 100 μM, n = 6) on γ power. (E): The bar graph summarizes the percent changes in γ power before and after various concentrations of nicotine (1–100 μM) in the presence of 1 μM D-AP5. 1 μM D-AP5 had no effect on γ oscillations (shallow dark bars) and the subsequent application of 1 μM nicotine had no significant effect on γ power (n = 8, black bars). Similarly, 1 μM D-AP5 also blocked the roles of nicotine at higher concentrations of 10 μM (n = 8) and 100 μM (n = 8) on γ power.