Glykys, JosephStaley, Kevin2016-08-092016Glykys, Joseph, and Kevin J. Staley. 2016. “Developmental Decrease of Neuronal Chloride Concentration Is Independent of Trauma in Thalamocortical Brain Slices.” PLoS ONE 11 (6): e0158012. doi:10.1371/journal.pone.0158012. http://dx.doi.org/10.1371/journal.pone.0158012.1932-6203http://nrs.harvard.edu/urn-3:HUL.InstRepos:27822232The intraneuronal chloride concentration ([Cl-]i) is paramount for determining the polarity of signaling at GABAA synapses in the central nervous system. Sectioning hippocampal brain slices increases [Cl-]i in the superficial layers. It is not known whether cutting trauma also increases [Cl-]i in the neocortex and thalamus, and whether the effects of trauma change during development. We used Cl- imaging to study the [Cl-]i vs. the distance from the cut surface in acute thalamocortical slices from mice at developmental ages ranging from post-natal day 5 (P5) to P20. We demonstrate: 1) [Cl-]i is higher in the most superficial areas in both neocortical and thalamic brain slices at all ages tested and, 2) there is a developmental decrease in [Cl-]i that is independent of acute trauma caused by brain slicing. We conclude that [Cl-]i has a developmental progression during P5-20 in both the neocortex and thalamus. However, in both brain regions and during development the neurons closest to the slicing trauma have an elevated [Cl-]i.en-USBiology and Life SciencesCell BiologyCellular TypesAnimal CellsNeuronsNeuroscienceCellular NeuroscienceAnatomyBrainNeocortexMedicine and Health SciencesThalamusNeurologyBrain DamageCritical Care and Emergency MedicineTrauma MedicineDevelopmental NeuroscienceSpecimen Preparation and TreatmentSpecimen SectioningHippocampusCellular Structures and OrganellesExtracellular MatrixJournal Article2016-08-0910.1371/journal.pone.0158012