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Lycopene attenuates diabetes-associated cognitive decline in rats
Anurag Kuhad1, Richa Sethi, Kanwaljit Chopra
1Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences, UGC Centre of Advanced Study, Panjab University, Chandigarh-160 014, India.
Life Sciences
|July 1, 2008
Summary
Lycopene, an antioxidant, improved learning and memory in diabetic rats by reducing oxidative stress and inflammation. This suggests lycopene may be a potential therapy for diabetes-related cognitive impairment.
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Diabetes mellitus can cause cognitive deficits, including learning and memory impairment.
- These impairments are linked to neuronal damage, oxidative stress, and inflammation.
- Intracellular glucose accumulation is implicated in diabetes-induced neurotoxicity.
Purpose of the Study:
- To investigate the effects of lycopene on cognitive function in streptozotocin (STZ)-induced diabetic rats.
- To assess lycopene's impact on oxidative stress markers in the diabetic brain.
- To evaluate lycopene's anti-inflammatory effects in the context of diabetes-induced cognitive impairment.
Main Methods:
- Diabetes was induced in rats using streptozotocin (STZ).
- Cognitive function was assessed using the spatial Morris water maze test.
- Biochemical analyses measured acetylcholinesterase activity, thiobarbituric acid-reactive substances (TBARS), non-protein thiols, superoxide dismutase (SOD), catalase, nitric oxide (NO), and serum tumor necrosis factor-alpha (TNF-α).
- Rats received chronic treatment with varying doses of lycopene.
Main Results:
- STZ-induced diabetic rats exhibited significant learning and memory deficits.
- Diabetic rats showed increased acetylcholinesterase activity, TBARS, and NO levels.
- Reduced non-protein thiol levels and decreased SOD and catalase activities were observed in diabetic rats.
- Serum TNF-α levels were significantly elevated in diabetic rats.
- Lycopene treatment dose-dependently attenuated cognitive deficits and reversed biochemical alterations associated with oxidative stress and inflammation.
Conclusions:
- Oxidative-nitrosative stress and peripheral inflammation play crucial roles in diabetes-induced cognitive impairment.
- Lycopene demonstrates significant therapeutic potential in mitigating learning and memory deficits associated with diabetes.
- Targeting oxidative stress and inflammation with agents like lycopene may offer a viable strategy for managing diabetic cognitive dysfunction.
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