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A Novel Biomarker for Cellular Toxicity and Phospholipid Accumulation by Cationic Amphiphilic Drugs

机译:阳离子两亲药物对细胞毒性和磷脂蓄积的新型生物标志物

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Drug-induced phospholipidosis (DIPL) is a phospholipid-hyperaccumulated state in cells, tissues and organs after treatment with cationic amphiphilic drugs (CADs). The biological meaning of phospholipidosis remains unknown. Although a hypothesis has been proposed that DIPL is a biological defense from CADs, experimental data supporting the hypothesis are poor. In this study, we compared CAD toxicity with RAW264 cells with/without egg phosphatidylcholine (egg PC) treatment to identify the role of phospholipids in DIPL. The 50% inhibitory concentrations of chlorpromazine, imipramine and propranolol were significantly increased by egg PC, in accordance with the hypothesis. Then, DIPL biomarkers, bis(monoacylglycero)phosphate (BMP) and the ratio of phosphatidylinositols (PIs) were measured to study the changes of these biomarkers by the relief of CAD toxicity with egg PC. BMP 22:6_22:6 was not increased by imipramine treatment alone due to imipramine toxicity. Co-treatment of egg PC with imipramine did not decrease BMP 22:6_22:6, which was inconsistent with the relief of toxicity. Conversely, the ratio of PIs increased by imipramine treatment alone, whereas it decreased by co-treatment with egg PC. These results suggest that the ratio of PIs reflects cellular phospholipid accumulation concurrent with CAD toxicity and that it is useful as a DIPL biomarker with high specificity.
机译:药物诱导的磷脂病(DIPL)是用阳离子两亲药物(CAD)处理后在细胞,组织和器官中的磷脂超富集状态。磷脂的生物学意义仍然未知。尽管有人提出DIPL是CAD的生物防御假说,但支持该假说的实验数据却很少。在这项研究中,我们比较了有/无卵磷脂酰胆碱(egg PC)处理的RAW264细胞与CAD毒性,以确定磷脂在DIPL中的作用。根据这一假设,卵PC显着提高了氯丙嗪,丙咪嗪和普萘洛尔50%的抑制浓度。然后,测量DIPL生物标记物,双(单酰基甘油)磷酸酯(BMP)和磷脂酰肌醇的比例(PIs),以研究这些生物标记物通过减轻鸡蛋PC对CAD毒性的作用而变化。 BMP 22:6_22:6不能单独使用丙咪嗪治疗,因为丙咪嗪毒性。卵PC与丙咪嗪的共同处理不会降低BMP 22:6_22:6,这与毒性缓解不一致。相反,仅通过丙咪嗪治疗可增加PI的比例,而与卵PC共同治疗则可降低PI的比例。这些结果表明,PI的比例反映了细胞磷脂积累与CAD毒性同时发生,并且它可用作具有高特异性的DIPL生物标志物。

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