Decreased dendritic spine density and abnormal spine morphology in Fyn knockout mice.

Decreased dendritic spine density and abnormal spine morphology in Fyn knockout mice.
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DOI:
10.1016/j.brainres.2011.07.059
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发表时间:
2011-09-30
期刊:
影响因子:
2.9
通讯作者:
Hoe HS
Hoe HS
中科院分区:
医学3区
文献类型:
--
作者:
Babus LW;Little EM;Keenoy KE;Minami SS;Chen E;Song JM;Caviness J;Koo SY;Pak DT;Rebeck GW;Turner RS;Hoe HS

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Fyn是Src家族酪氨酸激酶,影响长时程增强(LTP)、突触形成以及学习和记忆。Fyn也参与体外和体内树突棘的形成。然而,Fyn对树突棘形成的调节是否具有脑区域特异性和年龄依赖性尚不清楚。在本研究中,我们系统地研究了Fyn是否改变了皮质和海马中的树突棘密度和形态,以及这些影响是否具有年龄依赖性。我们发现Fyn基因敲除小鼠在1个月龄时,皮质层II/III的树突棘密度有下降的趋势,但在海马体中没有。此外,Fyn基因敲除小鼠在3个月和1年时皮质和海马中的树突棘密度显著降低,并且Fyn对海马中树突棘密度的影响具有年龄依赖性。此外,Fyn基因敲除小鼠在三个时间点(1个月、3个月、1年)的皮质中具有更宽的棘。这些发现表明,Fyn调节树突棘的数量和形态随着时间的推移,并提供进一步的支持Fyn的作用,在维持适当的突触功能在体内。
Fyn is a Src-family tyrosine kinase that affects long term potentiation (LTP), synapse formation, and learning and memory. Fyn is also implicated in dendritic spine formation both in vitro and in vivo. However, whether Fyn’s regulation of dendritic spine formation is brain-region specific and age-dependent is unknown. In the present study, we systematically examined whether Fyn altered dendritic spine density and morphology in the cortex and hippocampus and if these effects were age-dependent. We found that Fyn knockout mice trended toward a decrease in dendritic spine density in cortical layers II/III, but not in the hippocampus, at 1 month of age. Additionally, Fyn knockout mice had significantly decreased dendritic spine density in both the cortex and hippocampus at 3 months and 1 year, and Fyn’s effect on dendritic spine density was age-dependent in the hippocampus. Moreover, Fyn knockout mice had wider spines at the three time points (1 month, 3 months, 1 year) in the cortex. These findings suggest that Fyn regulates dendritic spine number and morphology over time and provide further support for Fyn’s role in maintaining proper synaptic function in vivo.
表达人类野生型Tau的转基因小鼠的树突复杂性和脊柱形态的变化。
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