The SK2-long isoform directs synaptic localization and function of SK2-containing channels Journal Article

Author(s): Allen, Duane H; Bond, Chris T; Luján, Rafael; Ballesteros-Merino, Carmen; Lin, Michael T; Wang, Kang; Klett, Nathan; Watanabe, Masahiko; Shigemoto, Ryuichi; Stackman, Robert W; Maylie, James G; Adelman, John P
Article Title: The SK2-long isoform directs synaptic localization and function of SK2-containing channels
Abstract: SK2-containing channels are expressed in the postsynaptic density (PSD) of dendritic spines on mouse hippocampal area CA1 pyramidal neurons and influence synaptic responses, plasticity and learning. The Sk2 gene (also known as Kcnn2) encodes two isoforms that differ only in the length of their N-terminal domains. SK2-long (SK2-L) and SK2-short (SK2-S) are coexpressed in CA1 pyramidal neurons and likely form heteromeric channels. In mice lacking SK2-L (SK2-S only mice), SK2-S-containing channels were expressed in the extrasynaptic membrane, but were excluded from the PSD. The SK channel contribution to excitatory postsynaptic potentials was absent in SK2-S only mice and was restored by SK2-L re-expression. Blocking SK channels increased the amount of long-term potentiation induced in area CA1 in slices from wild-type mice but had no effect in slices from SK2-S only mice. Furthermore, SK2-S only mice outperformed wild-type mice in the novel object recognition task. These results indicate that SK2-L directs synaptic SK2-containing channel expression and is important for normal synaptic signaling, plasticity and learning.
Keywords: Gene Expression; animal tissue; gene; amino terminal sequence; dendritic spine; excitatory postsynaptic potential; hippocampal CA1 region; postsynaptic density; pyramidal nerve cell; Sk2 gene
Journal Title: Nature Neuroscience
Volume: 14
Issue 6
ISSN: 1546-1726
Publisher: Nature Publishing Group  
Date Published: 2011-06-01
Start Page: 744
End Page: 749
DOI: 10.1038/nn.2832
Open access: no