Altered Neuroinflammatory Transcriptomic Profile in the Hippocampal Dentate Gyrus Three Weeks After Lateral Fluid...

Area of Science:

• Neuroscience
• Molecular Biology
• Pathology

Background:

• Traumatic brain injury (TBI) is a leading cause of global disability, frequently resulting in cognitive and memory impairments.
• The hippocampus, crucial for learning and memory, is highly susceptible to TBI.
• Dysfunction in the hippocampal dentate gyrus is a key factor in TBI-related cognitive deficits, yet its transcriptomic changes remain poorly understood.

Purpose of the Study:

• To investigate the transcriptomic alterations within the dentate gyrus at subacute-to-chronic timepoints following TBI.
• To identify specific cellular and molecular changes contributing to cognitive deficits after TBI.

Main Methods:

• Lateral fluid percussion injury was induced in male rats.
• Bulk RNA sequencing and single-nucleus RNA sequencing were performed on isolated dentate gyrus tissue.
• Analyses were conducted three weeks post-injury.

Main Results:

• Evidence of a persistent neuroinflammatory response was detected in the dentate gyrus.
• Increased expression of neuroinflammatory genes was observed.
• Specific microglia and astrocyte populations were implicated in the observed inflammatory pathways.

Conclusions:

• The dentate gyrus exhibits ongoing neuroinflammation weeks after TBI.
• Transcriptomic analysis highlights the involvement of specific glial cell populations in TBI-induced neuroinflammation.
• These findings provide insights into the molecular mechanisms underlying TBI-related cognitive dysfunction.