期刊
JOURNAL OF NEUROPHYSIOLOGY
卷 110, 期 6, 页码 1441-1454出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jn.01066.2012
关键词
visual map development; retinal waves; nicotinic acetylcholine receptor; superior colliculus; synapse maturation; morphological development; nicotine
资金
- National Eye Institute [R01 EY-015788]
- family of William Ziegler III
Prior to eye opening, waves of spontaneous activity sweep across the developing retina. These retinal waves, together with genetically encoded molecular mechanisms, mediate the formation of visual maps in the brain. However, the specific role of wave activity in synapse development in retino-recipient brain regions is unclear. Here we compare the functional development of synapses and the morphological development of neurons in the superior colliculus (SC) of wild-type (WT) and transgenic (beta 2-TG) mice in which retinal wave propagation is spatially truncated (Xu HP, Furman M, Mineur YS, Chen H, King SL, Zenisek D, Zhou ZJ, Butts DA, Tian N, Picciotto MR, Crair MC. Neuron 70: 1115-1127, 2011). We use two recently developed brain slice preparations to examine neurons and synapses in the binocular vs. mainly monocular SC. We find that retinocollicular synaptic strength is reduced whereas the number of retinal inputs is increased in the binocular SC of beta 2-TG mice compared with WT mice. In contrast, in the mainly monocular SC the number of retinal inputs is normal in beta 2-TG mice, but, transiently, synapses are abnormally strong, possibly because of enhanced activity-dependent competition between local, small retinal wave domains. These findings demonstrate that retinal wave size plays an instructive role in the synaptic and morphological development of SC neurons, possibly through a competitive process among retinofugal axons.
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