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| Content Provider | Springer Nature : BioMed Central |
|---|---|
| Author | Sanchez, Ana B. Medders, Kathryn E. Maung, Ricky Sánchez-Pavón, Paloma Ojeda-Juárez, Daniel Kaul, Marcus |
| Abstract | Background The chemokine receptor CXCR4 (CD184) and its natural ligand CXCL12 contribute to many physiological processes, including decisions about cell death and survival in the central nervous system. In addition, CXCR4 is a co-receptor for human immunodeficiency virus (HIV)-1 and mediates the neurotoxicity of the viral envelope protein gp120. However, we previously observed that CXCL12 also causes toxicity in cerebrocortical neurons but the cellular mechanism remained incompletely defined. Methods Primary neuronal-glial cerebrocortical cell cultures from rat were exposed to a neurotoxicity-inducing CXCL12 concentration for different times and the activity of the stress-associated mitogen-activated protein kinase p38 (p38 MAPK) was assessed using an in vitro kinase assay. Neurotoxicity of CXCL12 and cellular localization of p38 MAPK was analyzed by immunofluorescence microscopy. Pharmacological inhibition of NMDA-type glutamate receptor-gated ion channels (NMDAR) of l-type Ca2+ channels was employed during 12- and 24-h exposure to neurotoxic amounts of CXCL12 to study the effects on active p38 MAPK and neuronal survival by Western blotting and microscopy, respectively. Neurotoxicity of CXCL12 was also assessed during pharmacological inhibition of p38 MAPK. Results Here, we show that a neurotoxic amount of CXCL12 triggers a significant increase of endogenous p38 MAPK activity in cerebrocortical cells. Immunofluorescence and Western blotting experiments with mixed neuronal-glial and neuron-depleted glial cerebrocortical cells revealed that the majority of active/phosphorylated p38 MAPK was located in neurons. Blockade of NMDAR-gated ion channels or l-type Ca2+ channels both abrogated an increase of active p38 MAPK and toxicity of CXCL12 in cerebrocortical neurons. Inhibition of l-type Ca2+ channels with nimodipine kept the active kinase at levels not significantly different from baseline while blocking NMDAR with MK-801 strongly reduced phosphorylated p38 MAPK below baseline. Finally, we confirmed that directly blocking p38 MAPK also abrogated neurotoxicity of CXCL12. Conclusions Our findings link CXCL12-induced neuronal death to the regulation of NMDAR-gated ion channels and l-type Ca2+ channels upstream of p38 MAPK activation. |
| Related Links | https://jneuroinflammation.biomedcentral.com/counter/pdf/10.1186/s12974-016-0724-2.pdf |
| Ending Page | 12 |
| Page Count | 12 |
| Starting Page | 1 |
| File Format | HTM / HTML |
| ISSN | 17422094 |
| DOI | 10.1186/s12974-016-0724-2 |
| Journal | Journal of Neuroinflammation |
| Issue Number | 1 |
| Volume Number | 13 |
| Language | English |
| Publisher | BioMed Central |
| Publisher Date | 2016-09-23 |
| Access Restriction | Open |
| Subject Keyword | Neurosciences Neurology Neurobiology Immunology CXCL12 CXCR4 Neurotoxicity Cell death Calcium channel Inhibitors p38 MAPK Kinase activity Immunofluorescence microscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Neuroscience Immunology Cellular and Molecular Neuroscience Neurology |
| Journal Impact Factor | 9.3/2023 |
| 5-Year Journal Impact Factor | 9.8/2023 |
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