Department of Experimental Neuroendocrinology, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343 Kraków, Poland.
Department of Phytochemistry, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343 Kraków, Poland.
Biomolecules. 2020 Nov 9;10(11):1530. doi: 10.3390/biom10111530.
Finding effective neuroprotective strategies to combat various neurodegenerative disorders still remain a clinically unmet need. Methyl caffeate (MC), a naturally occurring ester of caffeic acid, possesses antioxidant and anti-inflammatory activities; however, its role in neuroprotection is less investigated. In order to better characterize neuroprotective properties of MC, we tested its effectiveness in various models of neuronal cell injury in human neuroblastoma SH-SY5Y cells and in mouse primary neuronal cell cultures. MC at micromolar concentrations attenuated neuronal cell damage induced by hydrogen peroxide (HO) in undifferentiated and neuronal differentiated SH-SY5Y cells as well as in primary cortical neurons. This effect was associated with inhibition of both caspase-3 and cathepsin D but without involvement of the PI3-K/Akt pathway. MC was neuroprotective when given before and during but not after the induction of cell damage by HO. Moreover, MC was protective against 6-OHDA-evoked neurotoxicity in neuronal differentiated SH-SY5Y cells via inhibition of necrotic and apoptotic processes. On the other hand, MC was ineffective in models of excitotoxicity (induced by glutamate or oxygen-glucose deprivation) and even moderately augmented cytotoxic effects of the classical apoptotic inducer, staurosporine. Finally, in undifferentiated neuroblastoma cells MC at higher concentrations (above 50 microM) induced cell death and when combined with the chemotherapeutic agent, doxorubicin, it increased the cell damaging effects of the latter compound. Thus, neuroprotective properties of MC appear to be limited to certain models of neurotoxicity and depend on its concentrations and time of administration.
寻找有效的神经保护策略来对抗各种神经退行性疾病仍然是临床未满足的需求。甲基咖啡酸酯(MC)是咖啡酸的天然酯,具有抗氧化和抗炎活性;然而,其在神经保护中的作用研究较少。为了更好地表征 MC 的神经保护特性,我们在人类神经母细胞瘤 SH-SY5Y 细胞和小鼠原代神经元细胞培养物中的各种神经元细胞损伤模型中测试了其有效性。MC 在微摩尔浓度下可减轻未分化和神经元分化的 SH-SY5Y 细胞以及原代皮质神经元中海洛因诱导的神经元细胞损伤。这种作用与 caspase-3 和组织蛋白酶 D 的抑制有关,但不涉及 PI3-K/Akt 途径。MC 在诱导细胞损伤之前、期间和之后给予均可发挥神经保护作用。此外,MC 通过抑制坏死和凋亡过程对神经元分化的 SH-SY5Y 细胞中的 6-OHDA 诱导的神经毒性具有保护作用。另一方面,MC 在兴奋性毒性模型(由谷氨酸或氧葡萄糖剥夺引起)中无效,甚至适度增强了经典凋亡诱导剂星形孢菌素的细胞毒性作用。最后,在未分化的神经母细胞瘤细胞中,MC 在较高浓度(高于 50μM)下诱导细胞死亡,并且当与化疗药物阿霉素联合使用时,它会增加后者化合物的细胞损伤作用。因此,MC 的神经保护特性似乎仅限于某些神经毒性模型,并且取决于其浓度和给药时间。