SGK1.1 limits brain damage after status epilepticus through M current-dependent and independent mechanisms
pmid: 33639207
SGK1.1 limits brain damage after status epilepticus through M current-dependent and independent mechanisms
Epilepsy is a neurological condition associated to significant brain damage produced by status epilepticus (SE) including neurodegeneration, gliosis and ectopic neurogenesis. Reduction of these processes constitutes a useful strategy to improve recovery and ameliorate negative outcomes after an initial insult. SGK1.1, the neuronal isoform of the serum and glucocorticoids-regulated kinase 1 (SGK1), has been shown to increase M-current density in neurons, leading to reduced excitability and protection against seizures. For this study, we used 4-5 months old male transgenic C57BL/6 J and FVB/NJ mice expressing near physiological levels of a constitutively active form of the kinase controlled by its endogenous promoter. Here we show that SGK1.1 activation potently reduces levels of neuronal death (assessed using Fluoro-Jade C staining) and reactive glial activation (reported by GFAP and Iba-1 markers) in limbic regions and cortex, 72 h after SE induced by kainate, even in the context of high seizure activity. This neuroprotective effect is not exclusively through M-current activation but is also directly linked to decreased apoptosis levels assessed by TUNEL assays and quantification of Bim and Bcl-xL by western blot of hippocampal protein extracts. Our results demonstrate that this newly described antiapoptotic role of SGK1.1 activation acts synergistically with the regulation of cellular excitability, resulting in a significant reduction of SE-induced brain damage in areas relevant to epileptogenesis.
- University of La Laguna Spain
Neurons, Epilepsy, Kainic Acid, KA-induced seizures, Cell Survival, Calcium-Binding Proteins, Microfilament Proteins, Neurosciences. Biological psychiatry. Neuropsychiatry, Apoptosis, Mice, Transgenic, Serum and glucocorticoid-regulated kinase 1, Protein Serine-Threonine Kinases, Neuroprotection, Immediate-Early Proteins, Mice, Status Epilepticus, Glial Fibrillary Acidic Protein, Excitatory Amino Acid Agonists, Animals, Gliosis, Kv7 potassium channels, Neuroglia, RC321-571
Neurons, Epilepsy, Kainic Acid, KA-induced seizures, Cell Survival, Calcium-Binding Proteins, Microfilament Proteins, Neurosciences. Biological psychiatry. Neuropsychiatry, Apoptosis, Mice, Transgenic, Serum and glucocorticoid-regulated kinase 1, Protein Serine-Threonine Kinases, Neuroprotection, Immediate-Early Proteins, Mice, Status Epilepticus, Glial Fibrillary Acidic Protein, Excitatory Amino Acid Agonists, Animals, Gliosis, Kv7 potassium channels, Neuroglia, RC321-571
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