Tumor necrosis factor-like weak inducer of apoptosis-induced neurodegeneration

Area of Science:

• Neuroscience
• Immunology
• Molecular Biology

Background:

• Tumor necrosis factor-like weak inducer of apoptosis (TWEAK) is a cytokine with known proangiogenic and proinflammatory roles.
• TWEAK exerts its functions through the membrane receptor Fn14.
• Previous studies indicated TWEAK's involvement in cell death pathways.

Purpose of the Study:

• To investigate the role of TWEAK and its receptor Fn14 in cerebral ischemia.
• To elucidate the signaling pathways involved in TWEAK-mediated neuronal responses.
• To evaluate the therapeutic potential of targeting TWEAK in stroke models.

Main Methods:

• Utilized a murine stroke model and tag-sequencing (MPSS) to identify TWEAK as an induced gene.
• Employed oxygen-glucose deprivation in primary cortical neurons to study TWEAK and Fn14 upregulation.
• Assessed NF-kappaB activation and neuronal cell death following TWEAK stimulation.
• Administered a neutralizing anti-TWEAK antibody in vivo to measure infarct size reduction.

Main Results:

• TWEAK and Fn14 were significantly upregulated in both in vivo and in vitro models of cerebral ischemia.
• TWEAK induced cell death in primary neurons, a process partially mediated by NF-kappaB signaling.
• Inhibition of NF-kappaB attenuated TWEAK-induced neuronal death.
• Treatment with an anti-TWEAK antibody significantly reduced infarct size in a murine stroke model.

Conclusions:

• TWEAK plays a critical role in mediating neuronal cell death and neurodegeneration following ischemic stroke.
• The TWEAK/Fn14 pathway, involving NF-kappaB, is a key contributor to ischemic brain injury.
• Neutralizing TWEAK represents a potential therapeutic strategy for stroke treatment.