Increased REDD1 facilitates neuronal damage after subarachnoid hemorrhage

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• Subarachnoid hemorrhage (SAH) is a major cause of death and disability.
• The role of Regulated in development and DNA damage responses 1 (REDD1) in SAH-induced neuronal damage is unknown.
• REDD1 is a stress-response protein induced by hypoxia and DNA damage.

Purpose of the Study:

• To investigate the involvement of REDD1 in neuronal damage following SAH.
• To assess REDD1 levels in patients with SAH.
• To explore REDD1 as a potential therapeutic target for SAH.

Main Methods:

• Measurement of REDD1 levels in cerebrospinal fluid (CSF) and peripheral blood of SAH patients and controls.
• Correlation analysis of REDD1 levels with SAH severity (Hunt-Hess grade).
• In vitro studies using neuronal cultures treated with hemolysate to induce REDD1 expression and assess the effect of REDD1 knockdown on neuronal apoptosis and LDH leakage.

Main Results:

• SAH markedly increased REDD1 levels in CSF compared to controls.
• REDD1 levels in CSF positively correlated with SAH severity and declined during recovery.
• REDD1 expression was induced by hemolysate in neurons, and REDD1 knockdown reduced hemolysate-induced neuronal apoptosis and LDH leakage.
• Peripheral blood REDD1 levels were higher in SAH patients and correlated with CSF levels.

Conclusions:

• REDD1 plays a critical role in the process of neuronal damage caused by SAH.
• Elevated REDD1 in CSF and blood serves as a potential biomarker for SAH.
• REDD1 represents a novel molecular target for protecting brain function against SAH injury.