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KF-1 ubiquitin ligase: anxiety suppressor model.

Cell Biochem. Biophys.2011 Jun;60(1-2):69-75. doi:10.1007/s12013-011-9177-5
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摘要


Anxiety disorders are the most popular psychiatric disease in any human societies irrespective of nation, culture, religion, economics or politics. Anxiety expression mediated by the amygdala may be suppressed by signals transmitted from the prefrontal cortex and hippocampus. KF-1 is an endoplasmic reticulum (ER)-based E3-ubiquitin (Ub) ligase with a RING-H2 finger motif at the C-terminus. The kf-1 gene expression is up-regulated in the frontal cortex and hippocampus in rats after anti-depressant treatments. The kf-1 null mice show no apparent abnormalities, but exhibit selectively pronounced anxiety-like behaviors or increased timidity-like responses. The kf-1 orthologous genes had been generated after the Poriferan emergence, and are found widely in all animals except insects, arachnids and threadworms such as Drosophila, Ixodes and Caenorhabditis, respectively. This suggests that the kf-1 gene may be relevant to some biological functions characteristic to animals. Based on these observations, the Anxiety Suppressor Model has been proposed, which assumes that KF-1 Ub ligase may suppress the amygdala-mediated anxiety by degrading some anxiety promoting protein(s), such as a neurotransmitter receptor, through the ER-associated degradation pathway in the frontal cortex and hippocampus. According to this model, the emotional sensitivity to environmental stresses may be regulated by the cellular protein level of KF-1 relative to that of the putative anxiety promoter. The kf-1 null mice should be useful in elucidating the molecular mechanisms of the anxiety regulation and for screening novel anxiolytic compounds, which may block the putative anxiety promoter.

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