Purinergic Modulation of Activity in the Developing Auditory Pathway  

作　　者：Sasa Jovanovic Ivan Milenkovic 

机构地区：[1]School of Medicine and Health Sciences,Carl von Ossietzky University Oldenburg,26129 Oldenburg,Germany

出　　处：《Neuroscience Bulletin》2020年第11期1285-1298,共14页神经科学通报（英文版）

基　　金：the Deutsche Forschungsgemeinschaft(DFG Grant 954/3-1)as a part of the priority program 1608“Ultrafast and temporally precise information processing:normal and dysfunctional hearing”。

摘　　要：Purinergic P2 receptors,activated by endogenous ATP,are prominently expressed on neuronal and nonneuronal cells during development of the auditory periphery and central auditory neurons.In the mature cochlea,extracellular ATP contributes to ion homeostasis,and has a protective function against noise exposure.Here,we focus on the modulation of activity by extracellular ATP during early postnatal development of the lower auditory pathway.In mammals,spontaneous patterned activity is conveyed along afferent auditory pathways before the onset of acoustically evoked signal processing.During this critical developmental period,inner hair cells fire bursts of action potentials that are believed to provide a developmental code for synaptic maturation and refinement of auditory circuits,thereby establishing a precise tonotopic organization.Endogenous ATP-release triggers such patterned activity by raising the extracellular K+concentration and contributes to firing by increasing the excitability of auditory nerve fibers,spiral ganglion neurons,and specific neuron types within the auditory brainstem,through the activation of diverse P2 receptors.We review recent studies that provide new models on the contribution of purinergic signaling to early development of the afferent auditory pathway.Further,we discuss potential future directions of purinergic research in the auditory system.

关 键 词：Purinergic signaling Auditory system DEVELOPMENT COCHLEA Spiral ganglion Auditory brainstem 

分 类 号：R339.16[医药卫生—人体生理学]