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Updated: Jul 1, 2026
Assessment of Vascular Regeneration in the CNS Using the Mouse Retina
Published on: June 23, 2014
Systemic irisin treatment modulates cognitive function through VEGF-associated hippocampal vascular signaling in
Aslı Karakılıç1, Özgür Bulmuş1, Emrah Özcan2
1Department of Physiology, Faculty of Medicine, Balıkesir University, Balıkesir, Turkey.
Insights
Irisin, an exercise-induced myokine, may offer cognitive support by enhancing blood vessel growth in the brain. This study investigated its effects on vascular dementia models, suggesting potential for cognitive impairment treatment.
Area of Science:
- Neuroscience
- Vascular Biology
- Pharmacology
Background:
- Vascular dementia (VaD) is linked to cognitive decline from chronic cerebral hypoperfusion (CCH).
- Neurovascular dysfunction and reduced hippocampal vascularity characterize VaD.
- Irisin, a myokine, is known for potential neuroprotective effects.
Purpose of the Study:
- To evaluate irisin's impact on cognitive function in a rat model of CCH.
- To investigate irisin's modulation of VEGF-associated angiogenic signaling in the hippocampus under CCH.
- To explore irisin as a potential therapeutic agent for vascular cognitive impairment.
Main Methods:
- Adult male Wistar albino rats were subjected to CCH via carotid artery occlusion.
- Rats received systemic irisin administration (100 ng/kg) intraperitoneally.
- Cognitive performance was assessed using the Morris Water Maze, and hippocampal VEGF-positive vascular profiles were quantified.
Main Results:
- CCH induced significant spatial learning and memory deficits, with reduced hippocampal vascularity.
- Irisin administration in healthy rats improved memory and increased VEGF-positive vascular profiles.
- In CCH rats, irisin showed partial memory improvement and vascular changes, though not statistically significant.
Conclusions:
- Irisin may support cognitive function by modulating angiogenesis-associated signaling under CCH.
- A positive correlation exists between hippocampal vascularity and spatial memory performance.
- Irisin shows promise as an adjunctive therapy for vascular cognitive impairment, especially for those inactive.
Abstract:
Vascular dementia (VaD), primarily caused by chronic cerebral hypoperfusion (CCH), is characterized by progressive cognitive decline associated with neurovascular dysfunction. The present study aimed to investigate whether systemic administration of irisin, an exercise-induced myokine, modulates cognitive performance and VEGF-associated angiogenic signaling in the hippocampus under CCH conditions. Thirty-eight adult male Wistar albino rats were randomly assigned to five groups: control, sham, irisin, ischemia, and ischemia + irisin. CCH was induced via permanent bilateral common carotid artery occlusion. Irisin (100 ng/kg) was administered intraperitoneally three times per week for four weeks. Cognitive performance was assessed using the Morris Water Maze, and VEGF-positive vascular profiles were quantified within a standardized hippocampal area (1 mm2 per section). CCH resulted in significant impairments in spatial learning and memory, accompanied by a reduction in VEGF-positive vascular profiles in the hippocampus. In healthy rats, irisin administration was associated with improved memory performance and increased VEGF-positive vascular profiles. In ischemic rats, irisin treatment was linked to partial improvements in memory parameters and VEGF-associated vascular changes, although these effects did not reach statistical significance. Learning-phase outcomes were more variable. Notably, the number of VEGF-positive vascular profiles positively correlated with spatial memory performance. These findings suggest that beyond its known neuroprotective properties, irisin may contribute to cognitive support through modulation of angiogenesis-associated signaling under CCH. While further studies are required to clarify optimal dosing strategies and mechanistic pathways, irisin may represent a promising adjunctive candidate for vascular cognitive impairment, particularly in individuals unable to engage in regular physical exercise.
