5. Conclusions
Recent studies using specific ol receptor antibodies, in corroboration with early subcellular fractionation studies, begin to unveil the unique cellular localization of σ1 receptors. It is clear now that σ1 receptors localize predominantly on the ER in varieties of mammalian cells, although σ1 receptors can show a multi-organelle distribution pattern inside the cell. Details of σ1 receptor distribution in highly polarized neurons in the brain will be examined in future studies. Understanding the protein topology and lipid components of specific membrane domains where σ1 receptors target (eg. lipid-rich globules on the ER) must help to unveil the exact molecular mechanism of σ1 receptors. ol Receptors show a very unique ability to translocate that is evoked by varieties of psychotropic drugs possessing σ1 receptor affinities. The dynamics of σ1 receptors appears to be related intimately to diverse actions exerted by σ1 ligands, particularly at the plasma membrane and at the ER. These actions include regulations of channel activity, exocytosis, signal transduction, plasma membrane remodeling (raft formation), and lipid transport/metabolism. All these actions may have a bearing in promoting neuronal plasticity in the brain.
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Hayashi, T., Su, TP. (2007). Subcellular Localization and Interacellular Dynamics of σ1 Receptors. In: Su, TP., Matsumoto, R.R., Bowen, W.D. (eds) Sigma Receptors. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-36514-5_8
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