Increased serotonin in the developing superior colliculus affects receptive-field size of retinotectal afferents but not that of postsynaptic neurons.
Increased serotonin in the developing superior colliculus affects receptive-field size of retinotectal afferents but not that of postsynaptic neurons.
复制标题
发育中的上丘中血清素的增加会影响视网膜顶盖传入神经的感受野大小，但不会影响突触后神经元的感受野大小。
DOI：
10.1017/s0952523899161078
复制
发表时间：
1999
影响因子：
1.9
通讯作者：
Rhoades,RW
中科院分区：
文献类型：
--
作者：
Ke,M;Mooney,RD;Rhoades,RW
Administration of a single subcutaneous dose of 5,7-dihydroxytryptamine (5,7-DHT) to newborn hamsters results in a significant increase in the density of serotoninergic (5-HT) fibers in the superficial layers of the superior colliculus (SC) and marked abnormalities in the uncrossed retinotectal projection when these animals reach adulthood (Rhoades et al., 1993). The present study was undertaken to determine whether elevation of 5-HT in the developing SC altered the visual representation in SC. Multi-unit recordings from SC cells demonstrated that the overall organization of the visual map in the superficial SC laminae was normal and that the receptive-field sizes for unit clusters were unchanged in the 5,7-DHT-treated animals. However, when a combination of CNQX and MK-801 was directly applied to the SC to block postsynaptic activity, the receptive fields of unit clusters (presumably retinotectal axon terminals) in the 5,7-DHT treated animals were significantly larger than those in the normally reared hamsters. These results are consistent with the conclusions that elevation of 5-HT levels in the developing SC reduces the postnatal refinement of the crossed retinotectal axons, and that mechanisms operating within the SC may act to maintain normal sizes for the receptive fields of its constituent neurons.
