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RAPID AND OPPOSITE EFFECTS OF BDNF AND NGF ON THE FUNCTIONAL ORGANIZATION OF THE ADULT CORTEX IN VIVO

机译:BDNF和NGF对成年皮层功能组织的快速和相反作用

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THE adult cortex is thought to undergo plastic changes that are closely dependent on neuronal activity (reviewed in ref. 1), although it is not yet known what molecules are involved. Neurotrophins and their receptors have been implicated in several aspects of developmental plasticity(2-4), and their expression in the adult cortex suggests additional roles in adult plasticity(5-9). To examine these potential roles in viva, we used intrinsic-signal optical imaging to quantify the effects of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF) on the functional representation of a stimulated whisker in the 'barrel' subdivision of the rat somatosensory cortex. Topical application of BDNF resulted in a rapid and long-lasting decrease in the size of a whisker representation, and a decrease in the amplitude of the activity-dependent intrinsic signal, In contrast, NGF application resulted in a rapid but transient increase in the size of a representation, and an increase in the amplitude of the activity-dependent intrinsic signal. These results demonstrate that neurotrophins can rapidly modulate stimulus-dependent activity in adult cortex, and suggest a role for neurotrophins in regulating adult cortical plasticity. [References: 30]
机译:尽管尚不清楚涉及哪些分子,但据认为成年皮层经历了与神经元活动密切相关的可塑性变化(参见参考文献1)。神经营养蛋白及其受体已牵涉到发育可塑性的几个方面(2-4),它们在成年皮质中的表达暗示了在成年可塑性中的其他作用(5-9)。为了检查这些在活体内的潜在作用,我们使用了内在信号光学成像技术来量化神经生长因子(NGF)和脑源性神经营养因子(BDNF)对“桶形”细分中受激晶须的功能表示的影响。大鼠体感皮层。局部应用BDNF导致晶须表示的大小快速而持久地减小,并且依赖活动的固有信号的幅度减小。相反,NGF的应用导致其大小快速但短暂地增加表示,以及与活动有关的固有信号的幅度增加。这些结果表明,神经营养蛋白可以快速调节成年皮质的刺激依赖性活动,并暗示神经营养蛋白在调节成年皮质可塑性中的作用。 [参考:30]

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