nervous system
• defects in axon growth of NGF-responsive sympathetic neurons are observed in the heart at E16.5
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• analysis of superior cervical ganglia (SCGs) revealed normal numbers of sympathetic neurons at E16.5 but significant cell loss at birth (P0.5) and 3 weeks after birth (P21) relative to control littermates
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• although no neuronal loss is detected at E16.5, sympathetic innervation of the heart is already decreased with a significant reduction in both density of innervation and axonal branching
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• analysis of superior cervical ganglia (SCGs) revealed normal numbers of sympathetic neurons at E16.5 but significant cell loss at birth (P0.5) and 3 weeks after birth (P21) relative to control littermates
• neuronal loss is likely due to the axons failing to reach target tissues and gain access to adequate levels of nerve growth factor (NGF)
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cellular
• defects in axon growth of NGF-responsive sympathetic neurons are observed in the heart at E16.5
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