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Pe-22-28 for Neurogenesis: Comparison of Research Models and Outcomes
Different experimental models yield distinct outcome patterns depending on baseline neurogenic status and the specific cognitive domain assessed. Healthy young adult rodents Normal (100% reference) +40–60% BrdU+ cells at 14 days Dentate gyrus cell proliferatio
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- Different experimental models yield distinct outcome patterns depending on baseline neurogenic status and the specific cognitive domain assessed.
- Healthy young adult rodents
- Normal (100% reference)
- +40–60% BrdU+ cells at 14 days
- Dentate gyrus cell proliferation
- Ceiling effect possible. Limited room for improvement in intact system
- Chronic stress (corticosterone)
- Suppressed (30–50% of normal)
- +70–100% recovery toward baseline
- Doublecortin+ immature neurons
- Doesn't address whether new neurons functionally integrate under stress conditions
- Aged rodents (18–24 months)
- Severely reduced (20–30% of young)
- +30–50% increase (still below young baseline)
- Morris water maze latency
- Age-related niche dysfunction limits maximal response
- Traumatic brain injury (post-acute)
- Biphasic (early spike, late suppression)
- +50–80% vs injured controls
- Spatial pattern separation accuracy
- Effect depends heavily on injury severity and administration timing. High variability
- Neurodegenerative models (transgenic)
- Progressive decline
- Variable (+20–60%) depending on disease stage
- Contextual fear discrimination
- Confounded by ongoing pathology (amyloid, tau). Neurogenesis alone insufficient for rescue
- This comparison illustrates a consistent principle: Pe-22-28 for neurogenesis produces the largest relative effect in models where baseline neurogenesis is acutely suppressed by a reversible factor (stress, inflammation) and smaller effects where structural limitations exist (aging, advanced neurodegeneration). Research design must account for baseline status when interpreting neurogenic interventions.