The brain-derived neurotrophic factor prompts platelet aggregation and secretion.

Area of Science:

• Neurobiology
• Hematology
• Molecular Biology

Background:

• Brain-derived neurotrophic factor (BDNF) is crucial in the central nervous system.
• BDNF is abundant in platelets, but its function there is unknown.

Purpose of the Study:

• To investigate the role of BDNF in platelet biology.
• To explore BDNF's signaling pathways and effects in platelets.

Main Methods:

• Platelet aggregation assays with varying BDNF concentrations.
• Analysis of TrkB receptor expression and function in platelets.
• Inhibition studies using Rac1, PKC, and PI3K inhibitors.
• Cytokine secretion profiling of BDNF-stimulated platelets.

Main Results:

• BDNF primes platelets at low concentrations and induces biphasic aggregation at high concentrations.
• Platelets express a truncated TrkB receptor mediating BDNF's effects.
• BDNF-induced platelet responses involve Rac1, PKC, and PI3K signaling.
• BDNF stimulates secretion of angiogenic and inflammatory cytokines from platelets.

Conclusions:

• Circulating BDNF regulates platelet activation, aggregation, and secretion.
• A truncated TrkB receptor and downstream kinases mediate BDNF's platelet effects.
• BDNF-mediated platelet responses may influence vascular homeostasis.