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Resistance to caspase-8 and -9 fragments in a malignant pleural mesothelioma cell line with acquired cisplatin-resistance

机译:对具有获得性顺铂耐药性的恶性胸膜间皮瘤细胞株对caspase-8和-9片段的耐药性

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摘要

Apoptotic cysteine–aspartate proteases (caspases) are essential for the progression and execution of apoptosis, and detection of caspase fragmentation or activity is often used as markers of apoptosis. Cisplatin (cis-diamminedichloroplatinum (II)) is a chemotherapeutic drug that is clinically used for the treatment of solid tumours. We compared a cisplatin-resistant pleural malignant mesothelioma cell line (P31res1.2) with its parental cell line (P31) regarding the consequences of in vitro acquired cisplatin-resistance on basal and cisplatin-induced (equitoxic and equiapoptotic cisplatin concentrations) caspase-3, -8 and -9 fragmentation and proteolytic activity. Acquisition of cisplatin-resistance resulted in basal fragmentation of caspase-8 and -9 without a concomitant increase in proteolytic activity, and there was an increased basal caspase-3/7 activity. Similarly, cisplatin-resistant non-small-cell lung cancer cells, H1299res, had increased caspase-3 and -9 content compared with the parental H1299 cells. In P31 cells, cisplatin exposure resulted in caspase-9-mediated caspase-3/7 activation, but in P31res1.2 cells the cisplatin-induced caspase-3/7 activation occurred before caspase-8 or -9 activation. We therefore concluded that in vitro acquisition of cisplatin-resistance rendered P31res1.2 cells resistant to caspase-8 and caspase-9 fragments and that cisplatin-induced, initiator-caspase independent caspase-3/7 activation was necessary to overcome this resistance. Finally, the results demonstrated that detection of cleaved caspase fragments alone might be insufficient as a marker of caspase activity and ensuing apoptosis induction.
机译:凋亡的半胱氨酸-天冬氨酸蛋白酶(胱天蛋白酶)对于凋亡的进行和执行至关重要,胱天蛋白酶片段化或活性的检测通常用作凋亡的标志物。顺铂(cis-diamminedichloroplatinum(II))是一种化学治疗药物,临床上用于治疗实体瘤。我们比较了顺铂耐药的胸膜恶性间皮瘤细胞系(P31res1.2)和其亲本细胞系(P31)在体外获得的顺铂耐药对基础和顺铂诱导的(等毒性和等凋亡的顺铂浓度)caspase-3的影响,-8和-9片段化和蛋白水解活性。顺铂耐药性的获得导致caspase-8和-9的基础片段化,而蛋白水解活性却没有随之增加,并且基础caspase-3 / 7活性也增加了。同样,与顺式H1299细胞相比,顺铂耐药的非小细胞肺癌细胞H1299res具有增加的caspase-3和-9含量。在P31细胞中,顺铂暴露导致caspase-9介导的caspase-3 / 7激活,但是在P31res1.2细胞中,顺铂诱导的caspase-3 / 7激活发生在caspase-8或-9激活之前。因此,我们得出结论,在体外获得顺铂耐药性使得P31res1.2细胞对caspase-8和caspase-9片段具有耐药性,而顺铂诱导的独立于caspase起始剂的caspase-3 / 7活化是克服这种耐药性所必需的。最后,结果表明,仅检测裂解的胱天蛋白酶片段可能不足以作为胱天蛋白酶活性和随后的细胞凋亡诱导的标志。

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