PMID: 9545178Apr 17, 1998Paper

Neuronal nuclear antigen (NeuN): a marker of neuronal maturation in early human fetal nervous system

Brain & Development
H B SarnatDonald E Born

Abstract

Neuronal nuclear antigen (NeuN) immunocytochemistry was studied in 15 normal human fetal nervous systems of 8-24 weeks gestation and in four term neonates. Material was derived from products of conception or from autopsy. Antigen retrieval was enhanced for immunocytochemistry by microwave heating of formalin-fixed paraffin sections. NeuN appears highly specific as a marker of neuronal nuclei in human fetal brain. Only rare nuclei are recognized in the germinal matrix. Cerebellar external granule cells are more strongly immunoreactive than postmigratory internal granule cells until 24 weeks gestation; by term most internal and only a few external granule cells are recognized by NeuN antibody. In the cerebrum, some reactive nuclei are demonstrated along radial glial fibers, particularly near the cortical plate. Within the cortical plate, only deep neurons (future layers 4-6) are marked at 19-22 weeks, but by 24 weeks most neurons in the cortical plate exhibit immunoreactivity, though at term some in layer 2 are still non-reactive. Some neurons fail to be recognized by NeuN at all ages: Cajal-Retzius cells, Purkinje cells, inferior olivary and dentate nucleus neurons, and sympathetic ganglion cells are examples. Despite their comm...Continue Reading

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