The DOR agonist DPDPE evokes and occludes I-LTD.

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Presentation transcript:

The DOR agonist DPDPE evokes and occludes I-LTD. The DOR agonist DPDPE evokes and occludes I-LTD. A, The 15 min application of two structurally distinct DOR agonists, 0.5 μm DPDPE (filled circles, n = 6) or 5 μm SNC162 (open circles, n = 4) can evoke a lasting depression at the inhibitory-CA2 synapse. Traces at right show IPSCs at two time points, before (a) and after (b) application of DOR agonist. B, Experiments showing the specific action of DOR on the induction of LTD in area CA2. Preapplication of the μ-opioid receptor antagonist CTOP does not alter the depression of IPSC amplitude by DPDPE. Summary graph of CA2 pyramidal neuron IPSC amplitude measured before and after DPDPE application in the presence of CTOP (gray circles, n = 3). Application of DPDPE to slices prepared from DOR KO mice (open symbols) fails to induce a lasting depression (n = 5). Traces to the right show example IPCSs at two time points, (a) before DPDPE applications and (b) after. C, Summary graph of CA2 neuron IPSC amplitude measured before and during the application of 0.5 μm DPDPE (n = 5). The IPSC amplitude is renormalized to 100% at 45 min (vertical gray dashed line) showing that an additional HFS fails to induce I-LTD. Traces inset above correspond to three time points (a) before DPDPE application, (b) following depression before HFS stimulation, and (c) 25 min after HFS. Right, Plot of individual PPRs for three time points noted in the graph. D, The summary graph of CA2 IPSC amplitude showing that DPDPE application has no effect on the IPSC amplitude after HFS-induced I-LTD (n = 6). Amplitudes are renormalized to 100% at 45 min (vertical gray dashed line) to facilitate comparison. Example IPSC traces for three time points are shown in inset above. Right, Individual PPRs are plotted for three time points. *p < 0.05. Error bars show SEM. Rebecca A. Piskorowski, and Vivien Chevaleyre J. Neurosci. 2013;33:14567-14578 ©2013 by Society for Neuroscience