Department of Biochemistry and Molecular Biology, University of Ulsan College of Medicine, Seoul 05505, Korea.
Center for Neuro-Medicine, Brain Science Institute, Korea Institute of Science and Technology, Seoul 02792, Korea.
Mol Cells. 2022 Mar 31;45(3):134-147. doi: 10.14348/molcells.2021.0074.
The anti-oxidant enzyme heme oxygenase-1 (HO-1) is known to exert anti-inflammatory effects. From a library of pyrazolo[3,4-]pyrimidines, we identified a novel compound KKC080096 that upregulated HO-1 at the mRNA and protein levels in microglial BV-2 cells. KKC080096 exhibited anti-inflammatory effects via suppressing nitric oxide, interleukin-1β (IL-1β), and iNOS production in lipopolysaccharide (LPS)-challenged cells. It inhibited the phosphorylation of IKK and MAP kinases (p38, JNK, ERK), which trigger inflammatory signaling, and whose activities are inhibited by HO-1. Further, KKC080096 upregulated anti-inflammatory marker (Arg1, YM1, CD206, IL-10, transforming growth factor-β [TGF-β]) expression. In 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-treated mice, KKC080096 lowered microglial activation, protected the nigral dopaminergic neurons, and nigral damage-associated motor deficits. Next, we elucidated the mechanisms by which KKC080096 upregulated HO-1. KKC080096 induced the phosphorylation of AMPK and its known upstream kinases LKB1 and CaMKKbeta, and pharmacological inhibition of AMPK activity reduced the effects of KKC080096 on HO-1 expression and LPS-induced NO generation, suggesting that KKC080096-induced HO-1 upregulation involves LKB1/AMPK and CaMKKbeta/AMPK pathway activation. Further, KKC080096 caused an increase in cellular Nrf2 level, bound to Keap1 (Nrf2 inhibitor protein) with high affinity, and blocked Keap1-Nrf2 interaction. This Nrf2 activation resulted in concurrent induction of HO-1 and other Nrf2-targeted antioxidant enzymes in BV-2 and in dopaminergic CATH.a cells. These results indicate that KKC080096 is a potential therapeutic for oxidative stress- and inflammation-related neurodegenerative disorders such as Parkinson's disease.
抗氧化酶血红素加氧酶-1(HO-1)已知具有抗炎作用。从吡唑并[3,4-d]嘧啶文库中,我们鉴定出一种新型化合物 KKC080096,它可在小胶质细胞 BV-2 细胞中上调 HO-1 的 mRNA 和蛋白水平。KKC080096 通过抑制脂多糖(LPS)刺激细胞中一氧化氮、白细胞介素-1β(IL-1β)和诱导型一氧化氮合酶(iNOS)的产生发挥抗炎作用。它抑制 IKK 和 MAP 激酶(p38、JNK、ERK)的磷酸化,这些激酶触发炎症信号,而 HO-1 抑制其活性。此外,KKC080096 上调抗炎标志物(Arg1、YM1、CD206、IL-10、转化生长因子-β[TGF-β])的表达。在 1-甲基-4-苯基-1,2,3,6-四氢吡啶处理的小鼠中,KKC080096 降低小胶质细胞活化,保护黑质多巴胺能神经元并减轻黑质损伤相关的运动障碍。接下来,我们阐明了 KKC080096 上调 HO-1 的机制。KKC080096 诱导 AMPK 及其已知上游激酶 LKB1 和 CaMKKβ的磷酸化,并且 AMPK 活性的药理学抑制降低了 KKC080096 对 HO-1 表达和 LPS 诱导的 NO 生成的影响,表明 KKC080096 诱导的 HO-1 上调涉及 LKB1/AMPK 和 CaMKKβ/AMPK 通路的激活。此外,KKC080096 导致细胞 Nrf2 水平增加,与 Keap1(Nrf2 抑制剂蛋白)高亲和力结合,并阻断 Keap1-Nrf2 相互作用。这种 Nrf2 激活导致 BV-2 和多巴胺能 CATH.a 细胞中 HO-1 和其他 Nrf2 靶向抗氧化酶的同时诱导。这些结果表明 KKC080096 是一种有潜力的治疗氧化应激和炎症相关神经退行性疾病的药物,如帕金森病。
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