Abstract:
:SK2 (KCa2.2) channels are voltage-independent Ca2+-activated K+ channels that regulate neuronal excitability in brain regions important for memory formation. In this study, we investigated the distribution and expression of SK2 channels in human brain by Western blot analysis and immunohistochemistry. Immunoblot analysis of human brain indicated expression of four distinct SK2 channel isoforms: the standard, the long and two short isoforms. Immunohistochemistry in paraffin-embedded post-mortem brain sections was performed in the hippocampal formation, amygdala and neocortex. In hippocampus, SK2-like immunoreactivity could be detected in strata oriens and radiatum of area CA1-CA2 and in the molecular layer. In the amygdala, SK2-like immunoreactivity was highest in the basolateral nuclei, while in neocortex, staining was mainly found enriched in layer V. Activation of SK2 channels is thought to regulate neuronal excitability in brain by contributing to the medium afterhyperpolarization. However, SK2 channels are blocked by apamin with a sensitivity that suggests heteromeric channels. The herein first shown expression of SK2 human isoform b in brain could explain the variability of electrophysiological findings observed with SK2 channels.
journal_name
Brain Struct Functjournal_title
Brain structure & functionauthors
Willis M,Trieb M,Leitner I,Wietzorrek G,Marksteiner J,Knaus HGdoi
10.1007/s00429-016-1258-1subject
Has Abstractpub_date
2017-03-01 00:00:00pages
973-979issue
2eissn
1863-2653issn
1863-2661pii
10.1007/s00429-016-1258-1journal_volume
222pub_type
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