1. Importin α4 deficiency induces psychiatric disorder-related behavioral deficits and neuroinflammation in mice.
- Author
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Sakurai K, Morita M, Aomine Y, Matsumoto M, Moriyama T, Kasahara E, Sekiyama A, Otani M, Oshima R, Loveland KL, Yamada M, Yoneda Y, Oka M, Hikida T, and Miyamoto Y
- Subjects
- Animals, Mice, Male, Anxiety genetics, Anxiety metabolism, Prefrontal Cortex metabolism, Microglia metabolism, NF-kappa B metabolism, Cytokines metabolism, Mental Disorders genetics, Mental Disorders metabolism, Mice, Inbred C57BL, Disease Models, Animal, Astrocytes metabolism, Basolateral Nuclear Complex metabolism, Mice, Knockout, Neuroinflammatory Diseases metabolism, alpha Karyopherins genetics, alpha Karyopherins metabolism, Behavior, Animal physiology
- Abstract
Importin α4, which is encoded by the Kpna4 gene, is a well-characterized nuclear-cytoplasmic transport factor known to mediate transport of transcription factors including NF-κB. Here, we report that Kpna4 knock-out (KO) mice exhibit psychiatric disorder-related behavioral abnormalities such as anxiety-related behaviors, decreased social interaction, and sensorimotor gating deficits. Contrary to a previous study predicting attenuated NF-κB activity as a result of Kpna4 deficiency, we observed a significant increase in expression levels of NF-κB genes and proinflammatory cytokines such as TNFα, Il-1β or Il-6 in the prefrontal cortex or basolateral amygdala of the KO mice. Moreover, examination of inflammatory responses in primary cells revealed that Kpna4 deficient cells have an increased inflammatory response, which was rescued by addition of not only full length, but also a nuclear transport-deficient truncation mutant of importin α4, suggesting contribution of its non-transport functions. Furthermore, RNAseq of sorted adult microglia and astrocytes and subsequent transcription factor analysis suggested increases in polycomb repressor complex 2 (PRC2) activity in Kpna4 KO cells. Taken together, importin α4 deficiency induces psychiatric disorder-related behavioral deficits in mice, along with an increased inflammatory response and possible alteration of PRC2 activity in glial cells., (© 2024. The Author(s).)
- Published
- 2024
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