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Immunocytochemical Localization of TASK-3 Protein (K2P9.1) in the Rat Brain

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Abstract

Among all K2P channels, TASK-3 shows the most widespread expression in rat brain, regulating neuronal excitability and transmitter release. Using a recently purified and characterized polyclonal monospecific antibody against TASK-3, the entire rat brain was immunocytochemically analyzed for expression of TASK-3 protein. Besides its well-known strong expression in motoneurons and monoaminergic and cholinergic neurons, TASK-3 expression was found in most neurons throughout the brain. However, it was not detected in certain neuronal populations, and neuropil staining was restricted to few areas. Also, it was absent in adult glial cells. In hypothalamic areas, TASK-3 was particularly strongly expressed in the supraoptic and suprachiasmatic nuclei, whereas other hypothalamic nuclei showed lower protein levels. Immunostaining of hippocampal CA1 and CA3 pyramidal neurons showed strongest expression, together with clear staining of CA3 mossy fibers and marked staining also in the dentate gyrus granule cells. In neocortical areas, most neurons expressed TASK-3 with a somatodendritic localization, most obvious in layer V pyramidal neurons. In the cerebellum, TASK-3 protein was found mainly in neurons and neuropil of the granular cell layer, whereas Purkinje cells were only faintly positive. Particularly weak expression was demonstrated in the forebrain. This report provides a comprehensive overview of TASK-3 protein expression in the rat brain.

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All authors declare that there are no conflicts of interest.

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Authors and Affiliations

  1. Institut für Integrative Neuroanatomie, Charité, Philippstr. 12, 10115, Berlin, Germany

    Christiane Marinc, Christian Derst & Rüdiger W. Veh

  2. Department of Neurology and Experimental Neurology, Charité, Charitéplatz 1, 10117, Berlin, Germany

    Harald Prüss

  3. German Center for Neurodegenerative Disorders (DZNE), Berlin, Germany

    Harald Prüss

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  1. Christiane Marinc
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  2. Christian Derst
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  3. Harald Prüss
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  4. Rüdiger W. Veh
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Correspondence to Harald Prüss.

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Marinc, C., Derst, C., Prüss, H. et al. Immunocytochemical Localization of TASK-3 Protein (K2P9.1) in the Rat Brain. Cell Mol Neurobiol 34, 61–70 (2014). https://doi.org/10.1007/s10571-013-9987-7

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  • DOI: https://doi.org/10.1007/s10571-013-9987-7

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