Cellular and subcellular localization of PKMζ
| Autor: | A. Iván Hernández, John F. Crary, Suzanne S. Mirra, William C. Oxberry, Todd Charlton Sacktor |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Male
Pyramidal Cells Endoplasmic reticulum Brain Fluorescent Antibody Technique Post-Synaptic Density Long-term potentiation Biology Hippocampal formation Subcellular localization Immunohistochemistry General Biochemistry Genetics and Molecular Biology Rats Cell biology Rats Sprague-Dawley Postsynaptic potential Animals Part I: Types and mechanisms of synaptic plasticity Microscopy Immunoelectron General Agricultural and Biological Sciences Protein kinase A Postsynaptic density Protein Kinase C Protein kinase C |
| Zdroj: | Philosophical Transactions of the Royal Society B: Biological Sciences. 369:20130140 |
| ISSN: | 1471-2970 0962-8436 |
| DOI: | 10.1098/rstb.2013.0140 |
| Popis: | In contrast to protein kinases that participate in long-term potentiation (LTP) induction and memory consolidation, the autonomously active atypical protein kinase C isoform, protein kinase Mzeta (PKMζ), functions in the core molecular mechanism of LTP maintenance and long-term memory storage. Here, using multiple complementary techniques for light and electron microscopic immunolocalization, we present the first detailed characterization of the cellular and subcellular distribution of PKMζ in rat hippocampus and neocortex. We find that PKMζ is widely expressed in forebrain with prominent immunostaining in hippocampal and neocortical grey matter, and weak label in white matter. In hippocampal and cortical pyramidal cells, PKMζ expression is predominantly somatodendritic, and electron microscopy highlights the kinase at postsynaptic densities and in clusters within spines. In addition, nuclear label and striking punctate immunopositive structures in a paranuclear and dendritic distribution are seen by confocal microscopy, occasionally at dendritic bifurcations. PKMζ immunoreactive granules are observed by electron microscopy in cell bodies and dendrites, including endoplasmic reticulum. The widespread distribution of PKMζ in nuclei, nucleoli and endoplasmic reticulum suggests potential roles of this kinase in cell-wide mechanisms involving gene expression, biogenesis of ribosomes and new protein synthesis. The localization of PKMζ within postsynaptic densities and spines suggests sites where the kinase stores information during LTP maintenance and long-term memory. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|