期刊
NEUROSCIENCE
卷 450, 期 -, 页码 15-28出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuroscience.2020.05.027
关键词
OPC; NG2; axotomy; spinal cord; oligodendrocyte
资金
- Research Foundation of the City College of New York
- graduate program in molecular, cellular and developmental biology (MCD) of the graduate center of the City University of New York
Oligodendrocyte precursor cells (OPCs) arise sequentially first from a ventral and then from a dorsal precursor domain at the end of neurogenesis during spinal cord development. Whether the sequential production of OPCs is of physiological significance has not been examined. Here we show that ablating Shh signaling from nascent ventricular zone derivatives and partially from the floor plate results in a severe diminishment of ventral derived OPCs but normal numbers of motor neurons in the postnatal spinal cord. In the absence of ventral vOPCs, dorsal dOPCs populate the entire spinal cord resulting in an increased OPC density in the ventral horns. These OPCs take on an altered morphology, do not participate in the removal of excitatory vGlut1 synapses from injured motor neurons, and exhibit morphological features similar to those found in the vicinity of motor neurons in the SOD1 mouse model of Amyotrophic Lateral Sclerosis (ALS). Our data indicate that vOPCs prevent dOPCs from invading ventral spinal cord laminae and suggest that vOPCs have a unique ability to communicate with injured motor neurons. (c) 2020 IBRO. Published by Elsevier Ltd. All rights reserved.
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