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咖啡因可逆转具有海马谷氨酸突触中腺苷A受体上调的抑郁倾向小鼠品系的记忆损伤,但不能逆转情绪损伤。

Caffeine Reverts Memory But Not Mood Impairment in a Depression-Prone Mouse Strain with Up-Regulated Adenosine A Receptor in Hippocampal Glutamate Synapses.

作者信息

Machado Nuno J, Simões Ana Patrícia, Silva Henrique B, Ardais Ana Paula, Kaster Manuella P, Garção Pedro, Rodrigues Diana I, Pochmann Daniela, Santos Ana Isabel, Araújo Inês M, Porciúncula Lisiane O, Tomé Ângelo R, Köfalvi Attila, Vaugeois Jean-Marie, Agostinho Paula, El Yacoubi Malika, Cunha Rodrigo A, Gomes Catarina A

机构信息

CNC-Center for Neurosciences and Cell Biology, University of Coimbra, 3004-517, Coimbra, Portugal.

Department of Biochemistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, 90035-003, Brazil.

出版信息

Mol Neurobiol. 2017 Mar;54(2):1552-1563. doi: 10.1007/s12035-016-9774-9. Epub 2016 Feb 9.

Abstract

Caffeine prophylactically prevents mood and memory impairments through adenosine A receptor (AR) antagonism. AR 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 AR density (72 ± 6 %) in hippocampal synapses, an enhanced facilitation of hippocampal glutamate release by the AR 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 AR 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 AR controlling synaptic glutamatergic function.

摘要

咖啡因通过拮抗腺苷 A 受体预防性地预防情绪和记忆障碍。腺苷 A 受体拮抗剂也能在治疗上改善情绪和记忆障碍,但尚不清楚咖啡因在治疗上是否有效,还是仅具有预防作用。由于抑郁症伴有情绪和记忆改变,我们现在探究了长期(4 周)摄入咖啡因(0.3 g/L)是否能改善无助小鼠(12 周龄,抑郁症的一种基于品系的模型)的情绪和记忆障碍。在悬尾试验和强迫游泳试验中,无助小鼠表现出更高的不动性,在高架十字迷宫中表现出更大的焦虑,并且记忆表现较差(改良 Y 迷宫和物体识别试验)。无助小鼠海马中突触(突触素、SNAP - 25)标记物的密度也降低,即谷氨酸能(囊泡谷氨酸转运体 1;-22±7%)和γ-氨基丁酸能(囊泡γ-氨基丁酸转运体;-23±8%)标记物减少。无助小鼠海马突触中的腺苷 A 受体密度更高(72±6%),腺苷 A 受体激动剂 CGS21680(30 nM)对海马谷氨酸释放的促进作用增强,长时程增强幅度更大(54±8%,而对照组为 21±5%),而腺苷 A 受体拮抗剂 SCH58261(50 nM)可将其恢复到对照水平(30±10%)。值得注意的是,摄入咖啡因可改善记忆缺陷并逆转海马突触标记物的丢失,但不影响无助或焦虑行为。这些结果通过表明无助小鼠也存在参考记忆缺陷,加强了其作为抑郁症动物模型的有效性。此外,摄入咖啡因选择性地改善了无助小鼠的记忆缺陷而非情绪缺陷,这与控制突触谷氨酸能功能的海马腺苷 A 受体密度增加及其功能影响有关。

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