Investigating the Role of KNG1 in Traumatic Brain Injury

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• Traumatic brain injury (TBI) is a significant cause of mortality and disability.
• The molecular mechanisms underlying TBI pathogenesis remain incompletely understood.
• Identifying novel therapeutic targets for TBI is crucial.

Purpose of the Study:

• To investigate the functional role of Kininogen-1 (KNG1) in TBI.
• To evaluate KNG1 as a potential therapeutic target for TBI.

Main Methods:

• Established a TBI rat model using controlled cortical impact.
• Assessed neurological deficits using modified neurological severity scores (mNSS).
• Analyzed brain tissue for edema, inflammation, and neuronal damage via histopathology, RT-qPCR, and transcriptomics.
• Utilized an in vitro oxidative stress model with H2O2-treated PC-12 cells.
• Performed KNG1 knockdown using siRNA and analyzed oxidative stress markers and MAPK pathway activation.

Main Results:

• TBI rats showed significant neurological impairment.
• Transcriptomics identified KNG1 as upregulated in TBI, linked to inflammation and MAPK signaling.
• In vitro, KNG1 knockdown reduced oxidative stress (increased SOD/CAT, decreased ROS) and suppressed MAPK-p38/ERK phosphorylation.

Conclusions:

• Kininogen-1 (KNG1) is significantly upregulated in TBI and linked to MAPK pathway activation.
• KNG1 knockdown alleviates oxidative stress and suppresses MAPK hyperactivation in vitro.
• KNG1 represents a critical factor in TBI pathology and a potential therapeutic target modulating injury cascades.