BDNF is an important regulator of synaptic circuit development, synaptic plasticity and neuroprotection in the brain. Changes in the concentration of BDNF in the human body have been linked to neurodegenerative diseases, neurological diseases, psychological diseases and so on. In order to better understand BDNF concentration changes in vivo, it is important to understand BDNF expression and release. Most studies on BDNF expression and release have been conducted during the preparation and culture of neurons. Therefore, this paper will focus on the expression and release of BDNF in different cells in the brain. In this paper, the synthesis, processing, sorting and induced release of BDNF will be reviewed.

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