Department of Biotechnology, Chemistry and Pharmacy, DoE 2018-2022, University of Siena, Via A. Moro 2, 53100 Siena, Italy.
Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Arcavacata di Rende, Italy.
Int J Mol Sci. 2022 Nov 5;23(21):13580. doi: 10.3390/ijms232113580.
α-Lipoic acid is a sulfur-containing nutrient endowed with pleiotropic actions and a safe biological profile selected to replace the unsaturated alkyl acid of capsaicin with the aim of obtaining lipoic amides potentially active as a TRPV1 ligand and with significant antioxidant properties. Thus, nine compounds were obtained in good yields following a simple synthetic procedure and tested for their functional TRPV1 activity and radical-scavenger activity. The safe biological profile together with the protective effect against hypoxia damage as well as the in vitro antioxidant properties were also evaluated. Although less potent than capsaicin, almost all lipoic amides were found to be TRPV1 agonists and, specifically, compound , the lipoic analogue of capsaicin, proved to be the best ligand in terms of efficacy and potency. EPR experiments and in vitro biological assays suggested the potential protective role against oxidative stress of the tested compounds and their safe biological profile. Compounds , and significantly ameliorated the mitochondrial membrane potential caused by hypoxia condition and decreased F2-isoprostanes, known markers of oxidative stress. Thus, the experimental results encourage further investigation of the therapeutic potential of these lipoic amides.
α-硫辛酸是一种含硫营养素,具有多种作用和安全的生物学特性,被选择替代辣椒素中的不饱和烷基酸,目的是获得潜在作为 TRPV1 配体的脂酰酰胺,同时具有显著的抗氧化特性。因此,按照简单的合成程序,得到了 9 种具有良好收率的化合物,并对它们的功能性 TRPV1 活性和自由基清除活性进行了测试。还评估了安全的生物学特性以及对缺氧损伤的保护作用和体外抗氧化特性。尽管不如辣椒素有效,但几乎所有的脂酰酰胺都被发现是 TRPV1 激动剂,特别是化合物 ,它是辣椒素的脂酰酰胺类似物,在效力和效能方面被证明是最好的配体。EPR 实验和体外生物测定表明,这些测试化合物具有潜在的抗氧化应激保护作用,且具有安全的生物学特性。化合物 、 和 显著改善了缺氧条件下引起的线粒体膜电位,并降低了 F2-异前列烷,这是氧化应激的已知标志物。因此,实验结果鼓励进一步研究这些脂酰酰胺的治疗潜力。