Muscle Spindle-Derived Neurotrophin 3 Regulates Synaptic Connectivity between Muscle Sensory and Motor Neurons
Muscle Spindle-Derived Neurotrophin 3 Regulates Synaptic Connectivity between Muscle Sensory and Motor Neurons
复制标题
肌梭源性神经营养素 3 调节肌肉感觉神经元和运动神经元之间的突触连接
作者:
Hsiao;W. Tourtellotte;E. Frank
Ia afferents induce the formation of muscle spindles prenatally and maintain them postnatally. To address whether spindles, in turn, regulate the function of Ia afferents, we examined Egr3-null mutant mice (Egr3−/−), in which muscle spindles degenerate progressively after birth. Egr3−/− mice develop gait ataxia, scoliosis, resting tremors, and ptosis, suggesting a defect in proprioception. Despite the normal morphological appearance of peripheral and central sensory projections, we observed a profound functional deficit in the strength of sensory–motor connections in Egr3−/− mice. Muscle spindles in Egr3−/− mice do not express NT3. Intramuscular injections of NT3 to Egr3−/− mice during the postnatal period restored sensory–motor connections. Thus, NT3 derived from muscle spindles regulates the synaptic connectivity between muscle sensory and motor neurons.
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DOI:
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发表时间:
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期刊:
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