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Neural Plasticity
Volume 2012 (2012), Article ID 237913, 9 pages
http://dx.doi.org/10.1155/2012/237913
Research Article

ZD7288 Enhances Long-Term Depression at Early Postnatal Medial Perforant Path-Granule Cell Synapses

1Oscar Langendorff Institute of Physiology, University of Rostock, Gertrudenstraße 9, 18057 Rostock, Germany
2Institute of Neuroanatomy, University of Hamburg, Martinistraße 52, 20246 Hamburg, Germany

Received 15 March 2012; Revised 8 May 2012; Accepted 8 May 2012

Academic Editor: Clive Bramham

Copyright © 2012 Xiati Guli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Hyperpolarization-activated, cyclic nucleotide-gated nonselective (HCN) channels modulate both membrane potential and resistance and play a significant role in synaptic plasticity. We compared the influence of HCN channels on long-term depression (LTD) at the medial perforant path-granule cell synapse in early postnatal (P9–15) and adult (P30–60) rats. LTD was elicited in P9–15 slices using low-frequency stimulation (LFS, 900 pulses, 1 Hz; % of baseline). Application of the specific HCN channel blocker ZD7288 (10 μM) before LFS significantly enhanced LTD ( %; ), showing HCN channels restrain LTD induction. However, when ZD7288 was applied after LFS, LTD was similar to control values and significantly different from the values obtained with ZD7288 application before LFS ( %; ), indicating that HCN channels do not modulate LTD expression. LTD in slices from adult rats were only marginally lower compared to those in P9–15 slices ( %), but bath application of ZD7288 prior to LFS resulted in the same amount of LTD ( %). HCN channels in adult tissue hence lose their modulatory effect. In conclusion, we found that HCN channels at the medial perforant path-granule cell synapse compromise LFS-associated induction, but not expression of LTD in early postnatal, but not in adult, rats.