Mild TBI Changes Brain and Plasma Neurosteroid Levels in Mice

Area of Science:

• Neuroscience
• Biochemistry
• Trauma Research

Background:

• Mild traumatic brain injury (mTBI) is common, difficult to diagnose, and may cause chronic issues.
• Objective biomarkers for mTBI are lacking, hindering diagnosis and treatment.
• Neurosteroids are potential candidates for biological markers in neurological conditions.

Purpose of the Study:

• To investigate neurosteroids as potential blood biomarkers for mTBI.
• To assess changes in specific neurosteroids following a controlled mTBI model.
• To evaluate the diagnostic potential of neurosteroids in mTBI.

Main Methods:

• Two cohorts of C57BL/6 mice were subjected to mTBI or sham surgery.
• Neurological function tests (anxiety, balance, locomotion) were performed.
• Brain and plasma neurosteroid levels were measured using gas chromatography-tandem mass spectrometry.

Main Results:

• mTBI mice showed prolonged anesthesia recovery and impaired balance.
• Brain levels of isopregnanolone and ISODOC decreased significantly post-mTBI.
• Plasma levels of ISODOC were reduced by 75% at 6 and 24 hours after mTBI.

Conclusions:

• ISODOC levels are significantly reduced in both brain and plasma following mTBI.
• ISODOC shows promise as a potential diagnostic biomarker for mild traumatic brain injury.
• Further research is warranted to validate ISODOC as a clinical biomarker for mTBI.