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. 2014 Sep 18;8:106. doi: 10.3389/fncir.2014.00106

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Copyright © 2014 Deardorff, Romer, Sonner and Fyffe.

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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C-bouton synaptic sites contain a complex signaling ensemble. Presynaptic bassoon-IR and postsynaptic SK3-IR and m2-IR share a striking subsynaptic fenestrated appearance within the C-bouton. All images are small confocal stacks (3 × 1 μm Z-stacks) of en face C-boutons, indicated with VAChT-IR (blue), on rat lumbar α-motoneurons. (A) Presynaptic active zone protein bassoon (green) is aligned with postsynaptic ion channels SK3 (Ai, red) and m2 receptors (Aii, red). (B) Kv2.1-IR (green) intercalates with SK3-IR (Bi, red) and m2-IR (Bii), “filling in” the C-bouton postsynaptic membrane. Scale bars are 2.0 μm.