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. 2017 Mar 2;10:42. doi: 10.3389/fnmol.2017.00042

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Copyright © 2017 Shavit-Stein, Artan-Furman, Feingold, Ben Shimon, Itzekson-Hayosh, Chapman, Vlachos and Maggio.

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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PAR2 induces LTD through the activation of TRPV4. (A) Application of TRPV4-agonist (2 μM RN1747) causes LTD. (B) Removal of the TRPV4-agonist (2 μM RN1747) following induction of LTD does not affect the stability of synaptic depression. (C) In presence of the TRPV4-antagonist (10 μM RN1734) the TRPV4-agonist is not able to induce synaptic depression. (D) In a two pathways experimental setting, low frequency stimulation (LFS, 1 Hz, 900 pulses) and TRPV4-agonist application induce similar levels of LTD. (E) LFS-induced LTD is not blocked by the TRPV4-antagonist. (F) Application of PAR2-agonist (10 μM AC55541) in presence of a TRPV4-antagonist (10 μM RN1734) blocks PAR2-induced LTD. (G) Application of TRPV4-agonist (2 μM RN1747) in presence of PAR2-antagonist (50 μM FSLLRY-NH₂) does not affect TRPV4-induced LTD. (H) Once PAR2-agonist mediated LTD is established, the TRPV4-agonist (2 μM RN1747) does not further de-potentiate a second pathway at adjusted response level (upward arrow). Averaged EPSP are plotted versus time. Representative traces at indicated times (a, b) are shown on top of each section, n = 12 slices for each experiments, refer to text for statistics.