Abstract
Cannabinoid type 2 receptor (CB2R) agonist AM1241 induces anti-inflammation by ameliorating microglial phenotypes, the mechanism, however, is still unknown. Peroxisome proliferator-activated receptor gamma coactivator-1α (PGC-1α) is a transcription protein which can regulate mitochondrial biogenesis, and the aim of this study is to investigate whether PGC-1α is involved in AM1241-induced anti-inflammation in N9 microglial cells. We used 10 ng/ml lipopolysaccharide (LPS) plus 10 U/ml interferon γ (IFNγ) to activate microglia into classic activated phenotype (M1 phenotype), and found that co-administration of 10 µM AM1241 increased the expressions of mitochondria biogenesis-associated proteins, including nuclear respiratory factor 1 (NRF-1), mitochondrial transcription factor A (TFAM) and COX IV, and up-regulated the biomarker levels of microglial M2 phenotype, including arginase 1 (Arg-1) and brain-derived neurotrophic factor (BDNF), and down-regulated biomarker levels of M1 phenotype, including inducible nitric oxide synthase (iNOS) and tumor necrosis factor α (TNF-α), compared to the cells treated with LPS plus IFNγ only (P < 0.05). By using PGC-1α-siRNA, however, we found that down-regulation of PGC-1α significantly reversed the AM1241-induced effects above (P < 0.05). According to the results in this study, we found that PGC-1α may mediate CB2R agonist AM1241-induced anti-inflammation in N9 microglial cells, and the mechanism might be associated with the enhancement of mitochondria biogenesis.
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This work was supported by the National Natural Science Foundation of China (Grant Numbers 81601148, 81700058), and Natural Science Foundation of Shaanxi, China (Grant Number 2018JM7087).
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MZ and SY designed the experiments; LM and WN performed the experiments; JL and JJ performed the analysis; SY contributed to writing. All authors have read and approved the final manuscript.
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Ma, L., Niu, W., Lv, J. et al. PGC-1α-Mediated Mitochondrial Biogenesis is Involved in Cannabinoid Receptor 2 Agonist AM1241-Induced Microglial Phenotype Amelioration. Cell Mol Neurobiol 38, 1529–1537 (2018). https://doi.org/10.1007/s10571-018-0628-z
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DOI: https://doi.org/10.1007/s10571-018-0628-z