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. 2014 Sep 26;8:104. doi: 10.3389/fnana.2014.00104

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Copyright © 2014 Botcher, Falck, Thomson and Mercer.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Distribution of VIP-immunopositive interneurons in CA2. (A) Example of immunoperoxidase staining for VIP. Superimposition of this staining with the labeling of PCP4 (middle panel) defined the borders of the CA2 region (dotted white lines). High magnification of VIP-immunolabeled somata in SO, SP, and SR are shown in the middle and bottom panels. Scale bars 1 mm (top panel) and 50 μm (middle and bottom panels). SO, Stratum Oriens; SP, stratum pyramidale; SR, stratum Radiatum; SLM, Stratum Lacunosum Moleculare; SL, Stratum Lucidum. (B) Example of the distribution of VIP-immunopositive somata in CA1, CA2, and CA3 (superimposition of five 50 μm-thick sections). (C) Distribution of VIP-positive neurons in all layers of the three CA regions (5 sections- n = 6). VIP interneurons constituted the smallest population in this study with a few VIP-immunopositive somata present in SO, SP, SL, and SLM and very few in SLM. There were more VIP-positive somata in SP of CA1 and CA2 than in CA3 (MW U, P < 0.05). ^*P = 0.01 to 0.05; ^**P = 0.001 to 0.01.