Lamin A/C cleavage by caspase-6 activation is crucial for apoptotic induction by photodynamic therapy with hexaminolevulinate in human B-cell lymphoma cells

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• 作者：Susan Shahzidi ; Andreas Brech ; Mouldy Sioud ; Xiaoran Li ; Zhenhe Suo ; Jahn M. Nesl ; Qian Peng
• 关键词：ALA ; 5-aminolevulinic acid ; HAL ; hexaminolevulinate ; PDT ; photodynamic therapy ; PpIX ; protoporphyrin IX ; TdT ; terminal deoxynucleotid transferase
• 刊名：Cancer Letters
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：339
• 期：1
• 页码：25-32
• 全文大小：1479 K

文摘

Photodynamic therapy (PDT) with a light-activated drug is an approved modality for cancer treatment. Hexaminolevulinate (HAL), a hexylester of 5-aminolevulinic acid as the photosensitising protoporphyrin IX (PpIX) precursor, is clinically used for both PDT and photodetection. Our previous studies have shown that HAL-PDT can effectively induce apoptosis in several human blood malignant cell lines. However, the mechanisms involved in the apoptotic induction are still not fully elucidated. In this study we have focused on the role of cellular lamin A/C in the apoptotic induction. HAL-PDT-mediated apoptosis was confirmed by various techniques including fluorescence microscopy and electron microscopy in both human B-cell lymphoma Ramos and Daudi cell lines. The lamin A/C, together with caspases-6 and -3, was cleaved during the apoptosis. Western blots, immunocytochemistry, fluorescence microscopy and electron microscopy demonstrated that the specific caspase-6inhibitor abrogated the HAL-PDT-mediated cleavages of both caspase-6 and lamin A/C and subsequent apoptosis in these two cell lines, suggesting that the cleavage of lamin A/C by the caspase-6 activation is crucial for such apoptotic induction.