Affiliation:
1. Central South University Xiangya Medical College: Central South University Xiangya School of Medicine
2. Xiangya Hospital Central South University
3. Brain Hospital of Hunan Province
4. The Second Xiangya Hospital of Central South University
5. Zhong Nan University Xiangya Medical College: Central South University Xiangya School of Medicine
Abstract
Abstract
A cohort of morphologically heterogenous doublecortin immunoreactive (DCX+) “immature neurons” has been identified in the cerebral cortex largely around layer II and the amygdala largely in the paralaminar nucleus (PLN) among various mammals. To gain a wide spatiotemporal view on these neurons in humans, we examined layer II and amygdalar DCX + neurons in the brains of infants to 100 year-old individuals. Layer II DCX + neurons occurred throughout the cerebrum in the infants/toddlers, mainly in the temporal lobe in the adolescents and adults, and only in the temporal cortex surrounding the amygdala in the elderly. Amygdalar DCX + neurons occurred in all age groups, localized primarily to the PLN, and reduced in number with age. The small-sized DCX + neurons were unipolar or bipolar, and formed migratory chains extending tangentially, obliquely and inwardly in layers I-III in the cortex, and from the PLN to other nuclei in the amygdala. Morphologically mature-looking neurons were lightly labeled and co-expressed the neuron-specific nuclear antigen, glutamic acid decarboxylase and nicotinamide adenine dinucleotide phosphate-diaphorase. Taken together, we consider that the layer II and amygdalar DCX + neurons form a slowly developing interneuron system that supports inhibitory network plasticity in the cerebrum in an age/region-dependent manner.
Publisher
Research Square Platform LLC
Cited by
2 articles.
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