Abstract
Lysophosphatidylinositol (LysoPI), an endogenous ligand for G protein-coupled receptor (GPR) 55, has been known to show various functions in several tissues and cells; however, its roles in the central nervous system (CNS) are not well known. In particular, the detailed effects of LysoPI on microglial inflammatory responses remain unknown. Microglia is the immune cell that has important functions in maintaining immune homeostasis of the CNS. In this study, we explored the effects of LysoPI on inflammatory responses using the mouse microglial cell line BV-2, which was stimulated with lipopolysaccharide (LPS), and some results were confirmed also in rat primary microglia. LysoPI was found to reduce LPS-induced nitric oxide (NO) production and inducible NO synthase protein expression without affecting cell viability in BV-2 cells. LysoPI also suppressed intracellular generation of reactive oxygen species both in BV-2 cells and primary microglia and cytokine release in BV-2 cells. In addition, LysoPI treatment decreased phagocytic activity of LPS-stimulated BV-2 cells and primary microglia. The GPR55 antagonist CID16020046 completely inhibited LysoPI-induced downregulation of phagocytosis in BV-2 microglia, but did not affect the LysoPI-induced decrease in NO production. Our results suggest that LysoPI suppresses microglial phagocytosis via a GPR55-dependent pathway and NO production via a GPR55-independent pathway. LysoPI may contribute to neuroprotection in pathological conditions such as brain injury or neurodegenerative diseases, through its suppressive role in the microglial inflammatory response.
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Abbreviations
- CB2 :
-
Cannabinoid 2
- DAN:
-
2,3-Diaminonaphthalene
- DCF:
-
2′,7′-Dichlorofluorescein
- DMEM:
-
Dulbecco’s modified Eagle medium
- DMSO:
-
Dimethyl sulfoxide
- ERK:
-
Extracellular signal-regulated kinase
- FBS:
-
Fetal bovine serum
- GPR:
-
G protein-coupled receptor
- H2DCFDA:
-
2′,7′-Dichlorodihydrofluorescein diacetate
- IL:
-
Interleukin
- INF-γ:
-
Interferon-γ
- iNOS:
-
Inducible nitric oxide synthase
- LPLs:
-
Lysophospholipids
- LPS:
-
Lipopolysaccharide
- LysoPI:
-
Lysophosphatidylinositol
- MA:
-
Methyl acetate
- MTT:
-
3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-tetrazolium bromide
- NF-κB:
-
Nuclear factor-kappa B
- NO:
-
Nitric oxide
- ROS:
-
Reactive oxygen species
- TNF-α:
-
Tumor necrosis factor-α
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This work was funded in part by JSPS KAKENHI Grant No. JP18K05999 to Y.N., JP17K15390 to K.T., and JP17K08127 to M.M.
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T.M. and M.M. contributed to the study concept and design, analysis, and drafting of the manuscript. K.T. participated in the data analysis and drafting of the manuscript. Y.N. provided helpful discussion, data interpretation, and manuscript review. All of the authors edited the manuscript and approved the final version.
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Minamihata, T., Takano, K., Moriyama, M. et al. Lysophosphatidylinositol, an Endogenous Ligand for G Protein-Coupled Receptor 55, Has Anti-inflammatory Effects in Cultured Microglia. Inflammation 43, 1971–1987 (2020). https://doi.org/10.1007/s10753-020-01271-4
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DOI: https://doi.org/10.1007/s10753-020-01271-4