Brain-derived neurotrophic factor

Brain-derived neurotrophic factor (BDNF) is a protein that, in humans, is encoded by the BDNF gene. BDNF is a member of the neurotrophin family of growth factors, which are related to the canonical Nerve Growth Factor (NGF). Neurotrophic factors are found in the brain and the periphery. BDNF is a key regulator of neuronal survival, development, function, and plasticity, and it is considered crucial for memory and learning.

Function

BDNF acts on certain neurons of the central nervous system and the peripheral nervous system, helping to support the survival of existing neurons, and encourage the growth and differentiation of new neurons and synapses. In the brain, it is active in areas vital to learning, memory, and higher thinking, such as the hippocampus, cortex, and basal forebrain.

Through its role in neuron survival and growth, BDNF is also considered to play a significant role in neuroplasticity, which allows the brain to adapt to new experiences. Research has shown that BDNF expression increases in the brain following physical exercise, suggesting a role in the beneficial effects of exercise on brain health.

Clinical Significance

Alterations in BDNF expression have been associated with a variety of neurological and psychiatric disorders, including neurodegenerative diseases like Alzheimer's disease, Parkinson's disease, and Huntington's disease, as well as depression, schizophrenia, and obsessive-compulsive disorder (OCD). As such, BDNF and its signaling pathways are considered potential targets for therapeutic intervention in these conditions.

Genetics

The gene encoding BDNF is located on the human chromosome 11p14.1 and consists of 11 exons. Variants within the BDNF gene have been linked to various psychiatric and neurological conditions, suggesting that genetic predisposition can influence BDNF levels and function. One well-studied variant is the Val66Met polymorphism, which has been associated with altered brain anatomy and memory performance in humans.

Therapeutic Applications

Given its role in neurogenesis and neuroplasticity, BDNF has been explored as a therapeutic agent for several neurological conditions. However, its therapeutic application is complicated by its poor blood-brain barrier penetration and short half-life in the bloodstream. Research is ongoing into the development of BDNF mimetics or delivery systems that can effectively increase BDNF levels in the brain.

See Also

• Neurotrophin
• Nerve Growth Factor (NGF)
• Neuroplasticity
• Neurogenesis