In vitro evaluation of novel N-acetylalaninate prodrugs that selectively induce apoptosis in prostate cancer cells

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• 作者：Christopher A McGoldrick (1)
  Yu-Lin Jiang (2)
  Marianne Brannon (1)
  Koyamangalath Krishnan (3)
  William L Stone (1)
  
  1. Department of Pediatrics ; East Tennessee State University ; Johnson City ; TN ; 37614-0578 ; USA
  2. Center for Biomedical Imaging ; Department of Radiology and Radiological Sciences ; Medical University of South Carolina ; Charleston ; SC ; 29425 ; USA
  3. Division of Hematology-Oncology ; Department of Internal Medicine ; East Tennessee State University ; Johnson City ; TN ; 37614 ; USA
  
• 关键词：Prostate cancer ; Prodrugs ; Chemotherapy ; Glutathione ; Oxidative stress ; Apoptosis ; Cell viability ; Oxidized protein hydrolase ; Reactive oxygen species ; Quinone methide
• 刊名：BMC Cancer
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：14
• 期：1
• 全文大小：1,226 KB
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• 刊物主题：Cancer Research; Oncology; Stem Cells; Animal Models; Internal Medicine;
• 出版者：BioMed Central
• ISSN：1471-2407

文摘

Background Cancer cell esterases are often overexpressed and can have chiral specificities different from that of the corresponding normal cells and can, therefore, be useful targets for activating chemotherapeutic prodrug esters. Prodrug esters are inactive compounds that can be preferentially activated by esterase enzymes. Moreover, cancer cells often exhibit a high level of intrinsic oxidative stress due to an increased formation of reactive oxygen species (ROS) and a decreased expression of some enzymatic antioxidants. Prodrugs designed to induce additional oxidative stress can selectively induce apoptosis in cancer cells already exhibiting a high level of intrinsic oxidative stress. This study focused on the in vitro evaluation of four novel prodrug esters: the R- and S- chiral esters of 4-[(nitrooxy)methyl]phenyl N-acetylalaninate (R- and S-NPAA) and the R- and S- chiral esters of 4-[(nitrooxy)methyl]naphth-1-yl N-acetylalaninate (R- and S-NQM), which are activated, to varying extents, by oxidized protein hydrolase (OPH, EC 3.4.19.1) yielding a quinone methide (QM) intermediate capable of depleting glutathione (GSH), a key intracellular antioxidant. OPH is a serine esterase/protease that is overexpressed in some human tumors and cancer cell lines. Methods To evaluate the chiral ester prodrugs, we monitored cellular GSH depletion, cellular protein carbonyl levels (an oxidative stress biomarker) and cell viability in tumorigenic and nontumorigenic prostate cancer cell lines. Results We found that the prodrugs were activated by OPH and subsequently depleted GSH. The S-chiral ester of NPAA (S-NPAA) was two-fold more effective than the R-chiral ester (R-NPAA) in depleting GSH, increasing oxidative stress, inducing apoptosis, and decreasing cell viability in tumorigenic prostate LNCaP cells but had little effect on non-tumorigenic RWPE-1 cells. In addition, we found that that S-NPAA induced apoptosis and decreased cell viability in tumorigenic DU145 and PC3 prostate cell lines. Similar results were found in a COS-7 model that overexpressed active human OPH (COS-7-OPH). Conclusions Our results suggest that prostate tumors overexpressing OPH and/or exhibiting a high level of intrinsic oxidative stress may be susceptible to QM generating prodrug esters that are targeted to OPH with little effect on non-tumorigenic prostate cells.