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Joao Duarte

Research team manager

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Caffeine consumption attenuates neurochemical modifications in the hippocampus of streptozotocin-induced diabetic rats

Author

  • João M N Duarte
  • Rui A. Carvalho
  • Rodrigo A Cunha
  • Rolf Gruetter

Summary, in English

Type 1 diabetes can affect hippocampal function triggering cognitive impairment through unknown mechanisms. Caffeine consumption prevents hippocampal degeneration and memory dysfunction upon different insults and is also known to affect peripheral glucose metabolism. Thus we now characterized glucose transport and the neurochemical profile in the hippocampus of streptozotocin-induced diabetic rats using in vivo(1)H NMR spectroscopy and tested the effect of caffeine consumption thereupon. We found that hippocampal glucose content and transport were unaltered in diabetic rats, irrespective of caffeine consumption. However diabetic rats displayed alterations in their hippocampal neurochemical profile, which were normalized upon restoration of normoglycaemia, with the exception of myo-inositol that remained increased (36 +/- 5%, p < 0.01 compared to controls) likely reflecting osmolarity deregulation. Compared to controls, caffeine-consuming diabetic rats displayed increased hippocampal levels of myo-inositol (15 +/- 5%, p < 0.05) and taurine (23 +/- 4%, p < 0.01), supporting the ability of caffeine to control osmoregulation. Compared to controls, the hippocampus of diabetic rats displayed a reduced density of synaptic proteins syntaxin, synaptophysin and synaptosome-associated protein of 25 kDa (in average 18 +/- 1%, p < 0.05) as well increased glial fibrillary acidic protein (20 +/- 5%, p < 0.05), suggesting synaptic degeneration and astrogliosis, which were prevented by caffeine consumption. In conclusion, neurochemical alterations in the hippocampus of diabetic rats are not related to defects of glucose transport but likely reflect osmoregulatory adaptations caused by hyperglycemia. Furthermore, caffeine consumption affected this neurochemical adaptation to high glucose levels, which may contribute to its potential neuroprotective effects, namely preventing synaptic degeneration and astrogliosis.

Publishing year

2009-10

Language

English

Pages

79-368

Publication/Series

Journal of Neurochemistry

Volume

111

Issue

2

Document type

Journal article

Publisher

Wiley-Blackwell

Keywords

  • Animals
  • Blood Glucose
  • Caffeine
  • Central Nervous System Stimulants
  • Chronic Disease
  • Diabetes Mellitus, Experimental
  • Gliosis
  • Hippocampus
  • Inositol
  • Magnetic Resonance Spectroscopy
  • Male
  • Models, Biological
  • Nerve Degeneration
  • Rats
  • Rats, Sprague-Dawley
  • Synapses
  • Taurine
  • Journal Article
  • Research Support, Non-U.S. Gov't

Status

Published

ISBN/ISSN/Other

  • ISSN: 1471-4159