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. 2014 Nov 25;8:139. doi: 10.3389/fncir.2014.00139

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Copyright © 2014 Stokes, Teeter and Isaacson.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and 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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Brief trains of back-propagating APs cause linear increases in Ca²⁺ in L3 PC distal apical dendrites. (A) L3 PC (identified by morphology and intrinsic electrical properties) filled with the calcium-sensitive dye OGB1-AM. Blue box, distal region of interest (ROI) used for measurements of Ca²⁺ transients. (B) Trains of 1–4 APs (50 Hz) evoked via somatic current injection (top traces) elicit Ca²⁺ transients (bottom traces, deltaF/F) in the ROI from cell in (A). (C) The relationship between peak dF/F and number of APs is linear in this range. (D) Summary of results (n = 8 cells, error bar = ±SEM) shows linear relationship between Ca²⁺ and number of APs.