Location and expression of neurotrophin-3 and its receptor in the brain of human embryos during early development

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Abstract

BACKGROUND:

Cell culture in vitro trials have demonstrated that neurotrophin-3 (NT-3) can enhance the survival of sensory neurons and sympathetic neurons, and can also support embryo-derived motor neurons.

BACKGROUND:

This effect is dependent on nerve growth factor on the surface of cells. Understanding the role of NT-3 and its receptor in the early development of human embryonic brains will help to investigate the correlation between early survival of nerve cells and the microenvironment of neural regeneration.

OBJECTIVE:

To observe the proliferation of cerebral neurons in the development of human embryonic brain, and to investigate the location, expression and distribution of NT-3 and its receptor TrkC during human brain development.

DESIGN, TIME AND SETTING:

An observation study on cells was performed in the Department of Human Anatomy, Histology and Embryology, Chengdu Medical College in September 2007.

MATERIALS:

Fifteen specimens of fresh human embryo, aged 6 weeks, were used in this study.

METHODS:

The proliferation of cerebral neurons was detected using proliferating cell nuclear antigen, and the immunocytochemistry ABC technique was applied to observe the location, expression and distribution of NT-3 and its receptor TrkC in the brain of the human embryo.

MAIN OUTCOME MEASURES:

Location, expression and distribution of NT-3 and its receptor in the brain of the human embryo.

RESULTS:

In the early period (aged 6 weeks) of human embryonic development, proliferating cell nuclear antigen-positive reactive substances were mainly observed in the nucleus of the forebrain ventricular zone and subventricular zone, and the intensity was stronger in the subventricular zone than the forebrain ventricle. NT-3 positive reactive substance was mainly distributed in the cytoblastema of the forebrain neuroepithelial layer and nerve cell process, while TrkC was mainly distributed in the cell membrane of the forebrain ventricular zone and subventricular zone. During embryonic development, NT-3 and TrkC showed a positive immune reaction to a greater or lesser extent in ependymal epithelium.

CONCLUSION:

During early human embryonic development, cerebral nerve cells proliferate in the ventricular zone and subventricular zone, and NT-3 is expressed in the neural axon. The results show that the highly expressed NT-3 could promote the proliferation of neural axons and maintain the neuron body's survival.

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