Jaspine B induces nonapoptotic cell death in gastric cancer cells independently of its inhibition of ceramide synthase
作者:Francesca Cingolani、Fabio Simbari、Jose Luis Abad、Mireia Casasampere、Gemma Fabrias、Anthony H. Futerman、Josefina Casas
DOI:10.1194/jlr.m072611
日期:2017.8
Sphingolipids (SLs) have been extensively investigated in biomedical research due to their role as bioactive molecules in cells. Here, we describe the effect of a SL analog, jaspine B (JB), a cyclic anhydrophytosphingosine found in marine sponges, on the gastric cancer cell line, HGC-27. JB induced alterations in the sphingolipidome, mainly the accumulation of dihydrosphingosine, sphingosine, and their
由于鞘脂作为细胞中的生物活性分子,因此在生物医学研究中已对其进行了广泛的研究。在这里,我们描述了SL类似物jaspine B(JB)(一种在海洋海绵中发现的环状脱水植物鞘氨醇)对胃癌细胞HGC-27的作用。JB诱导鞘脂组的改变,主要是由于抑制了神经酰胺合酶,导致二氢鞘氨醇,鞘氨醇的积累及其磷酸化形式的改变。此外,JB在HGC-27细胞中引起非典型细胞死亡,其特征在于以时间和剂量依赖的方式形成细胞质液泡。液泡似乎起源于巨胞饮作用并触发了细胞质破坏。泛半胱天冬酶抑制剂z-VAD不会改变细胞毒性或液泡形成,提示JB激活不依赖caspase的细胞死亡机制。自噬抑制剂渥曼青霉素并未降低JB刺激的LC3-II积累。此外,JB诱导的细胞空泡化的特征是单膜空泡,这不同于双膜自噬体。这些发现表明,JB诱导的细胞空泡化与自噬无关,并且也独立于其对SL代谢的作用。