Brain Glycogen Metabolism pp 363-383 | Cite as
Dysregulation of Glycogen Metabolism with Concomitant Spatial Memory Dysfunction in Type 2 Diabetes: Potential Beneficial Effects of Chronic Exercise
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Abstract
Cognitive dysfunction is one of the comorbidities of diabetes mellitus, but hippocampus-dependent learning and memory, a component of cognitive function, shows particular decline in type 2 diabetes, suggesting an increased risk for dementia and Alzheimer’s disease. Cognitive function is related to dysregulated glucose metabolism, which is the typical cause of type 2 diabetes; however, hippocampal glycogen and its metabolite lactate are also crucial for hippocampus-dependent memory function. Type 2 diabetes induced hippocampus-dependent learning and memory dysfunction can be improved by chronic exercise and this improvement may possibly mediate through an adaptation of the astrocyte-neuron lactate shuttle (ANLS). This chapter focuses on the dysregulation of hippocampal glycometabolism in type 2 diabetes examining both existing evidence as well as the potential underlying pathophysiological mechanism responsible for memory dysfunction in type 2 diabetes, and showing for the first time that chronic exercise could be an effective therapy for type-2-diabetes-induced hippocampal memory decline.
Keywords
Type 2 diabetes mellitus Hippocampus-dependent learning and memory Hippocampal glycometabolism Monocarboxylate transporter 2Abbreviations
- ANLS
Astrocyte-neuron lactate shuttle
- BDNF
Brain-derived neurotrophic factor
- DAB
1,4-Dideoxy-1,4-imino-D-arabinitol
- GLUT
Glucose transporter
- GSK-3β
Phosphorylated-GS kinase-3β
- LETO
Long-Evans Tokushima Otsuka
- LTP
Long-term potentiation
- MCT
Monocarboxylate transporters
- MHPG
NA metabolites
- NA
Noradrenaline
- NMDA
N-methyl-d-aspartate
- OLETF
Otsuka Long-Evans Tokushima Fatty
- pCofilin
Phosphorylated-Cofilin
- pCREB
Phosphorylated-cAMP-response-element-binding protein
- PGK
Phosphoglycerate kinase
- PTG
Protein targeting to glycogen
- STZ
Streptozotocin
- VIP
Vasoactive intestinal peptide
- ZDF
Zucker diabetic fatty
- ZL
Zucker lean
- ZO
Zucker obese
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