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Spatial memory impairments in a prediabetic rat model.

E Soares1, R D Prediger, S Nunes

  • 1Laboratory of Pharmacology and Experimental Therapeutics/IBILI, Faculty of Medicine, University of Coimbra, Subunit1-Pólo 3, Azinhaga de Santa Comba, Celas, 3000-354 Coimbra, Portugal.

Neuroscience
|August 6, 2013
PubMed
Summary

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This summary is machine-generated.

Prediabetes from high sucrose intake impairs spatial memory in rats. This occurs with hippocampal changes in insulin, glucocorticoid, and glutamate signaling, indicating early brain dysfunction.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Metabolic Disorders

Background:

  • Diabetes elevates the risk of brain disorders, including cognitive impairments and diabetic encephalopathy.
  • The effect of a prediabetic state on cognitive function remains largely unknown.
  • Investigating prediabetes is crucial for understanding early neurological changes.

Purpose of the Study:

  • To determine if prediabetes, induced by a high-sucrose diet, causes spatial learning and memory deficits.
  • To examine the underlying hippocampal dysfunction in a prediabetic animal model.
  • To assess the impact of sucrose-induced prediabetes on key molecular pathways in the brain.

Main Methods:

  • Adult Wistar rats consumed a high-sucrose diet (35% solution) for 9 weeks, establishing a prediabetic model.
Keywords:
ANOVAAUCBBBContEGTAELISAGAPDHGFAPGRGSGTTHFDHNEHOMAHPAHSuIGTITTN-methyl-d-aspartate receptorNMDARPBS-TPSD-95RAGESTZT2DMTGsTNF-αZDFZucker Diabetic Fattyanalysis of variancearea under the curveblood–brain barriercontroldiabetic encephalopathyenzyme-linked immunosorbent assayethylene glycol tetraacetic acidglial fibrillary acidic proteinglucocorticoid receptorglucose tolerance testglutamine synthetaseglyceraldehyde-3-phosphate dehydrogenasehigh-fat diethigh-sucrosehigh-sucrose diethippocampushomeostasis model assessment indexhydroxynonenalhypothalamic–pituitary–adrenalimpaired glucose toleranceinsulin tolerance testmemoryphosphate-buffered saline with 0.1% Tween-20postsynaptic density protein 95prediabetesreceptor for advanced glycation end productsstreptozotocintriglyceridestumor necrosis factor αtype 2 diabetes mellitus

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  • Spatial learning and memory were evaluated using the Y-maze and Morris water maze.
  • Hippocampal tissue was analyzed for insulin receptor-β, glucocorticoid receptor, and glutamatergic receptor subunit expression.

    • Main Results:

    • High-sucrose rats showed impaired short- and long-term spatial memory.
    • These deficits correlated with reduced hippocampal insulin receptor-β and glucocorticoid receptor levels.
    • Increased hippocampal AMPA and NMDA receptor subunits were observed, without changes in oxidative stress markers.

    Conclusions:

    • Nine weeks of sucrose consumption induced a prediabetic state with spatial memory deficits.
    • Alterations in hippocampal glutamatergic neurotransmission and glucocorticoid signaling are implicated in prediabetes-related cognitive decline.
    • These findings highlight potential early neurological consequences of prediabetes.