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机构地区:[1]东南大学医学院,南京210009 [2]东南大学附属中大医院神经内科,南京210009
出 处:《中华行为医学与脑科学杂志》2016年第3期193-197,共5页Chinese Journal of Behavioral Medicine and Brain Science
基 金:国家自然科学基金项目(91232707)
摘 要:目的:探讨经典抗抑郁药物西酞普兰对孤养导致的认知损害的改善作用与内在机制。方法60只8月龄的成年SD大鼠随机分组,分别予以群养(4只/笼)和孤养(1只/笼)6周。从孤养的第3周开始,孤养大鼠被随机分为孤养+西酞普兰组(西酞普兰10 mg/kg腹腔内注射)和孤养组(等量生理盐水腹腔内注射)。持续4周后,分别使用新奇认知实验、蛋白免疫印迹( Western blot)及酶联免疫吸附实验( ELISA)来检测大鼠的认知功能,皮层tau蛋白磷酸化水平和褪黑素含量。结果孤养组认知指数(0.48±0.15)比孤养+西酞普兰组(0.71±0.05)以及群养组(0.73±0.13)均显著降低,差异有统计学意义( P<0.05)。孤养组皮层的tau蛋白在丝氨酸396(3.94±0.74)、198/199/202(0.88±0.11)位点均出现过度磷酸化,经过西酞普兰干预后,tau蛋白丝氨酸396(2.31±0.24)及198/199/202(1.56±0.17)位点的磷酸化水平得到改善。与群养组相比,孤养组糖原合酶3β的总含量(1.12±0.09)明显增高,且其非活性位点9位丝氨酸(0.47±0.11)磷酸化水平明显下降,提示孤养组糖原合酶3β活性升高,西酞普兰可以部分逆转糖原合酶3β的总含量(0.87±0.08)以及非活性9位点丝氨酸(0.80±0.07)上的变化。与孤养组相比,西酞普兰干预可以增加皮层褪黑素水平[(359.54±18.80)pg/ml vs (418.15±18.72)pg/ml, P<0.05]。结论西酞普兰可以改善孤养大鼠的认知功能损害及皮层tau蛋白的过度磷酸化。其内在机制可能与西酞普兰增加了皮层内褪黑素水平,从而负性调控了糖原合酶3β活性有关。Objective To explore the effect of citalopram on tau phosphorylation and memory defi-cits induced by social isolation (SI) in adult rats.Methods Sixty Sprague-Dawley adult rats (8 months) were grouped or isolation reared for six-weeks.Following the initial two-week period of rearing, citalopram ( 10 mg/kg,i.p.) was administered for 4 weeks.Novel object recognition test,Western blot and ELISA were used to detect recognitive function,the levels of tau and GSK-3βprotein,and melatonin level respectively. Results In the novel object recognition test,compared with the citalopram group(0.71±0.05) and housed group(0.73±0.13),discrimination ratio(0.48±0.15) in SI group was significant decreased (P〈0.05).Tau hyperphosphorylation at Tau-1 ((0.88±0.11)),Ser396 (3.94±0.74) episodes were found and almost re-versed by citalopram at Tau-1 (1.56±0.17),Ser396 (2.31±0.24) episodes in SI group.Compared with GH group,the total level of GSK-3β(1.12±0.09) was significantly increased,while the level of Ser9-phosphoryl-ated GSK-3β(inactive form) (0.47±0.11) was significantly decreased in the SI group,both of which were reversed by citalopram (GSK-3β(0.87±0.08) and Ser9-phosphorylated GSK-3β(0.80±0.07)).The me-latonin level was decreased in SI group ((359.54±18.80)pg/ml),and citalopram could partly restore the level of melatonin (418.15±18.72)pg/ml, P〈0.05).Conclusion The results demonstrate that citalopram increases the level of melatonin which negatively regulates GSK-3βand attenuates tau hyperphosphorylation and memory deficits induced by SI in adult rats.
关 键 词:孤养 TAU蛋白 西酞普兰 阿尔茨海默病 褪黑素
分 类 号:R749.16[医药卫生—神经病学与精神病学]
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