Abstract
The peroxynitrite free radical (ONOO−) modulation of miniature excitatory postsynaptic currents (mEPSCs) and spontaneous excitatory postsynaptic currents (sEPSCs) was investigated in rat CA1 pyramidal neurons using the whole-cell patch clamp technique. SIN-1(3-morpholino-sydnonimine), which can lead the simultaneous generation of superoxide anion and nitric oxide, and then form the highly reactive species ONOO−, induced dose-dependent inhibition in amplitudes of both mEPSCs and sEPSCs. The SIN-1 action on mEPSC amplitude was completely blocked by U0126, a selective MEK inhibitor, suggesting that MEK contributed to the action of ONOO− on mEPSCs. The effect of SIN-1 was completely occluded either in the presence of the calcium chelator EGTA or the non-selective calcium channel antagonist Cd2+. Furthermore, the application of nifedipine (20 μM), the L-type calcium channel blocker, had no effect on the ONOO−-induced decrease in mEPSC amplitude, excluding a role for L-type voltage-gated Ca2+ channels in this process. SIN-1 inhibited the frequency of sEPSCs but had no effect on mEPSC frequency, which suggested a presynaptic action potential-dependent the action of ONOO− at CA1 pyramidal neuron synapses. The best-known glutamatergic input to CA1 pyramidal neurons is via Schaffer collaterals from CA3 area. However, no changes were observed in slices treated with SIN-1 on the spontaneous firing rates of CA3 pyramidal neurons. These findings suggested that SIN-1 inhibited glutamatergic synaptic transmission of CA1 pyramidal neurons by a postsynaptic non-L-type voltage gated calcium channel-dependent mechanism.
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This work was partly supported by the National Natural Science Foundation of China (31000509) and Tianjin Research Program of Application Foundation and Advanced Technology (10JCZDJC19100).
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Zhaowei, L., Yongling, X., Jiajia, Y. et al. The Reduction of EPSC Amplitude in CA1 Pyramidal Neurons by the Peroxynitrite Donor SIN-1 Requires Ca2+ Influx Via Postsynaptic Non-L-Type Voltage Gated Calcium Channels. Neurochem Res 39, 361–371 (2014). https://doi.org/10.1007/s11064-013-1233-7
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DOI: https://doi.org/10.1007/s11064-013-1233-7