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Tao-Cheng, Jung-Hwa; Yang, Yijung; Bayer, K. Ulrich; Reese, Thomas S.; Dosemeci, Ayse
Biochemical and biophysical research communications, 07/2014, Letnik: 450, Številka: 1Journal Article
•NMDA-induces accumulation of Shank at the postsynaptic density.•Shank accumulation is preferential to the distal region of the postsynaptic density.•Shank accumulation is mediated by CaMKII. Shank is a specialized scaffold protein present in high abundance at the postsynaptic density (PSD). Using pre-embedding immunogold electron microscopy on cultured hippocampal neurons, we had previously demonstrated further accumulation of Shank at the PSD under excitatory conditions. Here, using the same experimental protocol, we demonstrate that a cell permeable CaMKII inhibitor, tatCN21, blocks NMDA-induced accumulation of Shank at the PSD. Furthermore we show that NMDA application changes the distribution pattern of Shank at the PSD, promoting a 7–10nm shift in the median distance of Shank labels away from the postsynaptic membrane. Inhibition of CaMKII with tatCN21 also blocks this shift in the distribution of Shank. Altogether these results imply that upon activation of NMDA receptors, CaMKII mediates accumulation of Shank, preferentially at the distal regions of the PSD complex extending toward the cytoplasm.
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