School of Pharmacy, Weifang Medical University, Weifang 261053, Shandong Province, China.
Molecules. 2020 Feb 12;25(4):801. doi: 10.3390/molecules25040801.
Hyperglycemia is a strong risk factor for chronic complications of diabetes. Hyperglycemic conditions foster not only the production of reactive oxygen species (ROS), but also the consumption of antioxidants, leading to oxidative stress and promoting the occurrence and progression of complications. During our continuous search for antioxidant constituents from the pericarp of (A. Juss.) Roem, we isolated two previously unreported apotirucallane-type triterpenoids, toonasinensin A () and toonasinensin B (), together with five known apotirucallane-type triterpenoids (-) and two known cycloartane-type triterpenoids (-) from the pericarp. Compounds - were obtained from for the first time. Their structures were characterized based on interpretation of spectroscopic data (1D, 2D NMR, high-resolution electrospray ionization mass spectra, HR-ESI-MS) and comparison to previous reports. Compounds (, , , , and ) were able to inhibit proliferation against rat glomerular mesangial cells (GMCs) cultured under high-glucose conditions within a concentration of 80 μM. Compounds (, , and ) were tested for antioxidant activity attributable to superoxide dismutase (SOD), malondialdehyde (MDA), and ROS in vitro, and the results showed that compounds (, , and ) could significantly increase the levels of SOD and reduce the levels of MDA and ROS. The current studies showed that apotirucallane-type triterpenoids (, , and ) might have the antioxidant effects against diabetic nephropathy.
高血糖是糖尿病慢性并发症的一个重要危险因素。高血糖环境不仅促进活性氧(ROS)的产生,还消耗抗氧化剂,导致氧化应激,促进并发症的发生和发展。在我们不断从 (A. Juss.)Roem 的果皮中寻找抗氧化成分的过程中,我们分离得到了两种以前未报道的阿朴脂烷型三萜类化合物,分别为桐酸辛酯 A()和桐酸辛酯 B(),以及五种已知的阿朴脂烷型三萜类化合物(-)和两种已知的环阿屯烷型三萜类化合物(-)。化合物-首次从该植物中分离得到。根据光谱数据(1D、2D NMR、高分辨率电喷雾电离质谱、HR-ESI-MS)的解析和与以往报道的比较,确定了它们的结构。化合物(,,,,和)首次从该植物中分离得到。根据光谱数据(1D、2D NMR、高分辨率电喷雾电离质谱、HR-ESI-MS)的解析和与以往报道的比较,确定了它们的结构。化合物(,,,,和)首次从该植物中分离得到。根据光谱数据(1D、2D NMR、高分辨率电喷雾电离质谱、HR-ESI-MS)的解析和与以往报道的比较,确定了它们的结构。化合物(,,,,和)首次从该植物中分离得到。根据光谱数据(1D、2D NMR、高分辨率电喷雾电离质谱、HR-ESI-MS)的解析和与以往报道的比较,确定了它们的结构。它们的结构是基于光谱数据(1D、2D NMR、高分辨率电喷雾电离质谱、HR-ESI-MS)的解释和与以往报道的比较来确定的。化合物(,,,,和)首次从该植物中分离得到。它们的结构是基于光谱数据(1D、2D NMR、高分辨率电喷雾电离质谱、HR-ESI-MS)的解释和与以往报道的比较来确定的。化合物(,,,,和)首次从该植物中分离得到。它们的结构是基于光谱数据(1D、2D NMR、高分辨率电喷雾电离质谱、HR-ESI-MS)的解释和与以往报道的比较来确定的。它们的结构是基于光谱数据(1D、2D NMR、高分辨率电喷雾电离质谱、HR-ESI-MS)的解释和与以往报道的比较来确定的。这些化合物能够在 80 μM 的浓度下抑制高糖条件下培养的大鼠肾小球系膜细胞(GMCs)的增殖。化合物(,,和)被测试了其抗氧化活性,包括超氧化物歧化酶(SOD)、丙二醛(MDA)和 ROS,结果表明化合物(,,和)可以显著提高 SOD 的水平,降低 MDA 和 ROS 的水平。目前的研究表明,阿朴脂烷型三萜类化合物(,,和)可能具有抗氧化作用,可对抗糖尿病肾病。