Medvedev, N. I.; Popov, V. I.; Rodriguez Arellano, J. J.; Dallérac, G.; Davies, H. A.; Gabbott, P. L.; Laroche, S.; Kraev, I. V.; Doyère, V. and Stewart, M. G.
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|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1016/j.neuroscience.2009.11.047|
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Long-term morphological synaptic changes associated with homosynaptic long-term potentiation (LTP) and heterosynaptic long-term depression (LTD) in vivo, in awake adult rats were analyzed using three-dimensional (3-D) reconstructions of electron microscope images of ultrathin serial sections from the molecular layer of the dentate gyrus. For the first time in morphological studies, the specificity of the effects of LTP and LTD on both spine and synapse ultrastructure was determined using an N-methyl-d-aspartate (NMDA) receptor antagonist CPP (3-[(R)-2-carboxypiperazin-4-yl]-propyl-1-phosphonic acid). There were no differences in synaptic density 24 h after LTP or LTD induction, and CPP alone had no effect on synaptic density. LTP increased significantly the proportion of mushroom spines, whereas LTD increased the proportion of thin spines, and both LTP and LTD decreased stubby spine number. Both LTP and LTD increased significantly spine head evaginations (spinules) into synaptic boutons and CPP blocked these changes. Synaptic boutons were smaller after LTD, indicating a pre-synaptic effect. Interestingly, CPP alone decreased bouton and mushroom spine volumes, as well as post-synaptic density (PSD) volume of mushroom spines.These data show similarities, but also some clear differences, between the effects of LTP and LTD on spine and synaptic morphology. Although CPP blocks both LTP and LTD, and impairs most morphological changes in spines and synapses, CPP alone was shown to exert effects on aspects of spine and synaptic structure.
|Item Type:||Journal Article|
|Copyright Holders:||2010 Elsevier Ltd|
|Academic Unit/Department:||Science > Life, Health and Chemical Sciences
|Interdisciplinary Research Centre:||Biomedical Research Network (BRN)
Centre for Research in Computing (CRC)
|Depositing User:||Michael Stewart|
|Date Deposited:||06 Jan 2010 12:54|
|Last Modified:||07 Mar 2014 15:05|
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