Suppression of Alzheimer-associated inflammation by microglial prostaglandin-E2 EP4 receptor signaling
| Autor: | Ju Shi, Qian Wang, Katrin I. Andreasson, Paul B Larkin, Jenny U. Johansson, Nathaniel S. Woodling, Olivier Boutaud, Irene Zagol-Ikapitte, Prachi Priyam |
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| Rok vydání: | 2014 |
| Předmět: |
Methyl Ethers
Cell Survival EP4 Receptor Inflammation Biology Proinflammatory cytokine Alzheimer Disease medicine Animals Humans Neuroinflammation Aged Aged 80 and over Innate immune system Amyloid beta-Peptides Microglia General Neuroscience Neurodegeneration Articles medicine.disease Peptide Fragments Cell biology medicine.anatomical_structure Immunology lipids (amino acids peptides and proteins) medicine.symptom Signal transduction Receptors Prostaglandin E EP4 Subtype Signal Transduction |
| Zdroj: | The Journal of neuroscience : the official journal of the Society for Neuroscience. 34(17) |
| ISSN: | 1529-2401 |
| Popis: | A persistent and nonresolving inflammatory response to accumulating Aβ peptide species is a cardinal feature in the development of Alzheimer's disease (AD). In response to accumulating Aβ peptide species, microglia, the innate immune cells of the brain, generate a toxic inflammatory response that accelerates synaptic and neuronal injury. Many proinflammatory signaling pathways are linked to progression of neurodegeneration. However, endogenous anti-inflammatory pathways capable of suppressing Aβ-induced inflammation represent a relatively unexplored area. Here we report that signaling through the prostaglandin-E2(PGE2) EP4 receptor potently suppresses microglial inflammatory responses to Aβ42peptides. In cultured microglial cells, EP4 stimulation attenuated levels of Aβ42-induced inflammatory factors and potentiated phagocytosis of Aβ42. Microarray analysis demonstrated that EP4 stimulation broadly opposed Aβ42-driven gene expression changes in microglia, with enrichment for targets of IRF1, IRF7, and NF-κB transcription factors.In vivo, conditional deletion of microglial EP4 in APPSwe-PS1ΔE9(APP-PS1) mice conversely increased inflammatory gene expression, oxidative protein modification, and Aβ deposition in brain at early stages of pathology, but not at later stages, suggesting an early anti-inflammatory function of microglial EP4 signaling in the APP-PS1 model. Finally, EP4 receptor levels decreased significantly in human cortex with progression from normal to AD states, suggesting that early loss of this beneficial signaling system in preclinical AD development may contribute to subsequent progression of pathology. |
| Databáze: | OpenAIRE |
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