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Effects of a Serotonin Receptor Peptide on Behavioral Pattern Separation in Sham- vs. Mild Traumatic Brain Injured
Xena M Agbolou1, Christine W Yoe1, Tara P Cominski1,2
1Medical & Research Services, Veterans Affairs New Jersey Healthcare System, East Orange, New Jersey, USA.
Endocrinology, Diabetes and Metabolism Journal
|January 17, 2025
Summary
Mild traumatic brain injury in rats impaired behavioral pattern separation, a key memory function. A novel neuroprotective peptide, SN..8, prevented this loss, offering hope for cognitive protection after brain injury.
Area of Science:
- Neuroscience
- Cognitive Science
- Neurotrauma
Background:
- Behavioral pattern separation is crucial for episodic memory and an early indicator of cognitive decline.
- Mild traumatic brain injury (mTBI) can negatively impact cognitive functions, including memory.
- The serotonin 2A receptor (5-HT2A) is implicated in cognitive processes.
Purpose of the Study:
- To investigate if mild traumatic brain injury (mTBI) causes a loss of behavioral pattern separation in rats.
- To determine if a novel neuroprotective peptide fragment (SN..8) derived from the human serotonin 2A receptor can prevent mTBI-induced deficits in pattern separation.
Main Methods:
- mTBI was induced in male Sprague-Dawley rats using lateral fluid percussion.
- Rats were trained and tested on a modified Morris water maze to assess pattern separation using varying platform distances.
- The SN..8 peptide or a scrambled control peptide was administered intraperitoneally at 1, 3, and 5 days post-injury.
Main Results:
- Rats demonstrated pattern separation ability, with fewer errors as platform separation increased.
- SN..8 peptide administration significantly reduced errors in mTBI rats at 2 weeks post-injury, particularly at 4.5 and 3.0 feet separations.
- Cognitive performance largely recovered by 5 weeks post-injury across all groups.
Conclusions:
- The modified Morris water maze effectively assesses behavioral pattern separation.
- Systemic administration of the SN..8 peptide shows potential in protecting against mTBI-induced loss of behavioral pattern separation.
- These findings suggest SN..8 as a potential therapeutic agent for cognitive deficits following mild traumatic brain injury.
