Title:Caffeine Improve Memory and Cognition via Modulating Neural Progenitor
Cell Survival and Decreasing Oxidative Stress in Alzheimer's Rat
Model
Volume: 20
Issue: 3
关键词:
阿尔茨海默氏症,咖啡因,神经发生,海马体,前额叶皮层,莫里斯水迷宫。
摘要:
Aims: Caffeine possesses potent antioxidant, anti-inflammatory and anti-apoptotic activities
against a variety of neurodegenerative diseases, including Alzheimer’s disease (AD) and Parkinson’s
disease (PD). The goal of this study was to investigate the protective role of a psychoactive substance
like caffeine on hippocampal neurogenesis and memory functions in streptozotocin (STZ)-induced
neurodegeneration in rats.
Background: Caffeine is a natural CNS stimulant, belonging to the methylxanthine class, and is a
widely consumed psychoactive substance. It is reported to abate the risk of various abnormalities that
are cardiovascular system (CVS) related, cancer related, or due to metabolism dysregulation. Shortterm
caffeine exposure has been widely evaluated, but its chronic exposure is less explored and pursued.
Several studies suggest a devastating role of caffeine in neurodegenerative disorders. However,
the protective role of caffeine on neurodegeneration is still unclear.
Objective: Here, we examined the effects of chronic caffeine administration on hippocampal neurogenesis
in intracerebroventricular STZ injection induced memory dysfunction in rats. The chronic effect
of caffeine on proliferation and neuronal fate determination of hippocampal neurons was evaluated
by co-labeling of neurons by thymidine analogue BrdU that labels new born cells, DCX (a marker for
immature neurons) and NeuN that labels mature neurons.
Methods: STZ (1 mg/kg, 2 μl) was injected stereotaxically into the lateral ventricles (intracerebroventricular
injection) once on day 1, followed by chronic treatment with caffeine (10 mg/kg, i.p) and
donepezil (5 mg/kg, i.p.). Protective effect of caffeine on cognitive impairment and adult hippocampal
neurogenesis was evaluated.
Results: Our findings show decreased oxidative stress burden and amyloid burden following caffeine
administration in STZ lesioned SD rats. Further, double immunolabeling with bromodeoxyuridine+/
doublecortin+ (BrdU+/DCX+) and bromodeoxyuridine+/ neuronal nuclei+ (BrdU+/NeuN+) has
indicated that caffeine improved neuronal stem cell proliferation and long term survival in STZ lesioned
rats.
Conclusion: Our findings support the neurogenic potential of caffeine in STZ induced neurodegeneration.