4.5 Article

DOWNREGULATION OF HOMER1B/C IMPROVES NEURONAL SURVIVAL AFTER TRAUMATIC NEURONAL INJURY

Journal

NEUROSCIENCE
Volume 267, Issue -, Pages 187-194

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuroscience.2014.02.037

Keywords

neurons; injury; receptors; glutamic acid; Homer1; RNAi

Categories

Funding

  1. National Natural Science Foundation of China [30930093]
  2. research funds from the government [AWS11J008, 2012BAI11B02]
  3. Program for Changjiang Scholars and Innovative Research Team in University [IRT1053]

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Homer protein, a member of the post-synaptic density protein family, plays an important role in the neuronal synaptic activity and is extensively involved in neurological disorders. The present study investigates the role of Homer1b/c in modulating neuronal survival by using an in vitro traumatic neuronal injury model, which was achieved by using a punch device that consisted of 28 stainless steel blades joined together and produced 28 parallel cuts. Downregulation of Homer1b/c by specific siRNA significantly (p < 0.05) alleviated the cytoplasmic calcium levels and neuron lactate dehydrogenase release, and ultimately decreased the apoptotic rate after traumatic neuronal injury compared with non-targeting siRNA control treatment in cultured rat cortical neurons. Moreover, the expression of metabotropic glutamate receptor 1a (mGluR1a) was significantly (p < 0.05) reduced in the Homer1b/c siRNA-transfected neurons after injury. Therefore, Homer1b/c not only modulated the mGluR1a-inositol 1,4,5-triphosphate receptors-Ca2+ signal transduction pathway, but also regulated the expression of mGluR1a in mechanical neuronal injury. These findings indicate that the suppression of Homer1b/c expression potentially protects neurons from glutamate excitotoxicity after injury and might be an effective intervention target in traumatic brain injury. (C) 2014 IBRO. Published by Elsevier Ltd. All rights reserved.

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