Abstract
Caffeine prophylactically prevents mood and memory impairments through adenosine A2A receptor (A2AR) antagonism. A2AR antagonists also therapeutically revert mood and memory impairments, but it is not known if caffeine is also therapeutically or only prophylactically effective. Since depression is accompanied by mood and memory alterations, we now explored if chronic (4 weeks) caffeine consumption (0.3 g/L) reverts mood and memory impairment in helpless mice (HM, 12 weeks old), a bred-based model of depression. HM displayed higher immobility in the tail suspension and forced swimming tests, greater anxiety in the elevated plus maze, and poorer memory performance (modified Y-maze and object recognition). HM also had reduced density of synaptic (synaptophysin, SNAP-25), namely, glutamatergic (vGluT1; −22 ± 7 %) and GABAergic (vGAT; −23 ± 8 %) markers in the hippocampus. HM displayed higher A2AR density (72 ± 6 %) in hippocampal synapses, an enhanced facilitation of hippocampal glutamate release by the A2AR agonist, CGS21680 (30 nM), and a larger LTP amplitude (54 ± 8 % vs. 21 ± 5 % in controls) that was restored to control levels (30 ± 10 %) by the A2AR antagonist, SCH58261 (50 nM). Notably, caffeine intake reverted memory deficits and reverted the loss of hippocampal synaptic markers but did not affect helpless or anxiety behavior. These results reinforce the validity of HM as an animal model of depression by showing that they also display reference memory deficits. Furthermore, caffeine intake selectively reverted memory but not mood deficits displayed by HM, which are associated with an increased density and functional impact of hippocampal A2AR controlling synaptic glutamatergic function.
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Abbreviations
- A2AR:
-
Adenosine A2A receptor
- ADA:
-
Adenosine deaminase
- BrdU:
-
5-Bromo-2′-deoxyuridine
- CADO:
-
2-Chloroadenosine
- CGS21680:
-
4-[2-[[6-amino-9-(N-ethyl-β-D-ribofuranuronamidosyl)-9H-purin-2-yl]amino]ethyl]benzene propanoic acid
- DPCPX:
-
1,3-Dipropyl-8-cyclopentylxanthine
- fEPSPs:
-
Field excitatory post-synaptic potentials
- FR:
-
Fractional release
- HM:
-
Helpless mice
- LTP:
-
Long-term potentiation
- NHM:
-
Non-helpless mice
- PSD95:
-
Post-synaptic density 95 kDa
- SCH58261:
-
{7-(2-phenylethyl)-5-amino-2-(2-furyl)-pyrazolo-[4,3-e]-1,2,4-triazolol[1,5c]pyrimidine
- SNAP25:
-
Synaptosomal-associated protein 25 kDa
- vGAT:
-
Vesicular GABA transporters
- vGluT1:
-
Vesicular glutamate transporter type 1
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Acknowledgments
This work was supported by NARSAD, DARPA (09-68-ESR-FP-010), Fundação para a Ciência e para a Tecnologia (PTDC/SAU-NEU/122254/2010 and PEst-C/SAU/LA0001/2013-2014), QREN (CENTRO-07-ST24-FEDER-002006), program Égide-Pessoa, CAPES-FCT, and CAPES (Ciência sem Fronteiras).
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Nuno J. Machado, Ana Patrícia Simões, Henrique B. Silva, Ana Paula Ardais, Manuella P. Kaster, Pedro Garção, Diana I. Rodrigues and Catarina A. Gomes contributed equally to this work.
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Machado, N.J., Simões, A.P., Silva, H.B. et al. Caffeine Reverts Memory But Not Mood Impairment in a Depression-Prone Mouse Strain with Up-Regulated Adenosine A2A Receptor in Hippocampal Glutamate Synapses. Mol Neurobiol 54, 1552–1563 (2017). https://doi.org/10.1007/s12035-016-9774-9
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DOI: https://doi.org/10.1007/s12035-016-9774-9