Metabolic reprogramming: A new paradigm for targeting cisplatin resistant cells

代谢重编程：针对顺铂耐药细胞的新范例

• 批准号: 8764690
• 负责人: Medhi Wangpaichitr
• 金额: --
• 依托单位: MIAMI VA HEALTH CARE SYSTEM
• 依托单位国家: 美国
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-10-01 至 2017-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8764690
• 关键词: Adopted; Affect; Amino Acids; Anabolism; Biochemical; Biological Assay; Cancer Etiology; Cancer Patient; Carbon; Carboplatin; Cause of Death; Cell Death; Cell Line; Cell Respiration; Cells; Cessation of life; Cisplatin; Complex; Development; Disease; Disease Progression; Disease remission; Drug resistance; Drug usage; Early treatment; Energy-Generating Resources; Enzymes; Excision; Fatty Acids; Future; Generations; Glutamine; Glycolysis; Health; In Vitro; Knowledge; Lead; Malignant neoplasm of lung; Metabolic; Metabolic Pathway; Metabolism; Molecular; Mus; Nephrotoxic; Non-Small-Cell Lung Carcinoma; Normal Cell; Normal tissue morphology; Operative Surgical Procedures; Outcome; Oxidation-Reduction; Oxidative Stress; Pathway interactions; Patients; Pharmaceutical Preparations; Platinum; Production; Publications; Reactive Oxygen Species; Resistance; Sampling; Skeleton; Source; Staging; Testing; Thioredoxin; Toxic effect; Treatment outcome; Veterans; Warburg Effect; Work; Xenograft procedure; analog; cancer cell; chemotherapy; clinically relevant; cytotoxic; deprivation; design; fatty acid metabolism; improved; in vivo; inhibitor/antagonist; killings; lung Carcinoma; lung small cell carcinoma; novel; novel strategies; novel therapeutic intervention; oxidation; resistance mechanism; small hairpin RNA; tumor; tumor metabolism; uptake

DESCRIPTION (provided by applicant): Lung carcinoma is one of the leading causes of cancer deaths in the world. Treatment for early stage non small cell lung cancer (NSCLC) is surgery while chemotherapy is the mainstay of treatment in small cell lung cancer (SCLC). Most veterans present as locally advanced or metastatic disease which makes resection not possible. For these patients, cisplatin or its less nephrotoxic analog carboplatin is the main chemotherapeutic drug used for both NSCLC and SCLC. The majority of lung cancer patients will respond initially to cisplatin treatment; however, development of drug resistance is inevitable which results in disease progression. Thus, development of a new strategy to treat cisplatin resistant lung cancer will undoubtedly have a major impact for the treatment of these patients. Although there are overwhelming publications in the past decade on cisplatin resistance, but thus far no drugs are available which could reverse cisplatin resistance or selectively kill these resistant cells. We have discovered novel biochemical changes in cisplatin resistant cells which can be utilized as targets to selectively eradicate them. Firstly, we have found that all cisplatin resistant cells lines including primary culture from patients possess higher reactive oxygen species (ROS) levels when compared to normal cells or their parental cell counterparts. Consequently, agents which increase ROS such as elesclomol can push them beyond their tolerance limit which ultimately leads to cell death. Secondly, these cisplatin resistant cells have decreased intracellular thioredoxin-1 (TRX1) levels as a result of increasing secretion under in vitro and in vivo conditions which could be a primary contributory factor to higher ROS levels. Thirdly, cisplatin resistant cells are no longer dependent on glycolysis metabolism, but rely on amino acids and/or fatty acids (oxidative metabolism) as their carbon skeleton source. Significantly, glutamine deprivation or inhibition of key enzyme in fatty acid synthetic pathway can selectively kill cisplatin resistant cells. Taken together, we hypothesize that decreased intracellular TRX1, which results in higher ROS accumulation, could lead to metabolic reprogramming in cisplatin resistant tumors. In this application, we plan to further confirm and exploit these findings by (i) determine that cisplatin resistant lung cancer cells switch from glycolytic metabolism to oxidative metabolism as their main carbon source for energy and biosynthesis, (ii) investigate that TRX1 is a key factor in ROS accumulation, cisplatin sensitivity, and alteration in tumor metabolism, (iii) determine that ROS generation agent or metabolic inhibitor which can selectively kill cisplatin resistant cells in vitro also occurs in vivo, (iv) determine the possible relationships between ROS, TRX1, and changes in tumor metabolism are also found in tumor samples obtained from patients who have failed cisplatin treatment. To further evaluate the clinical relevance of our findings, we will confirm that a ROS producing agent or metabolic inhibitor is also highly cytotoxic to freshly isolated cisplatin resistant lung cancer cells from patients. Overall, this proposed work will sere as a novel approach to overcome cisplatin resistance by exploiting the primary biochemical differences which these resistant cells adopt to survive. Thus, by targeting these differences, we can selectively eradicate these resistant cells with minimal normal tissue toxicity. Furthermore, the findings obtained from this application can also be used as a platform to investigate possible ways to selectively kill cisplatin resistant cells from other tumor types.

描述（由申请人提供）： 肺癌是世界上癌症死亡的主要原因之一。早期非小细胞肺癌（NSCLC）的治疗主要是手术，而小细胞肺癌（SCLC）的治疗主要是化疗。大多数退伍军人表现为局部晚期或转移性疾病，无法切除。对于这些患者，顺铂或其肾毒性较小的类似物卡铂是NSCLC和SCLC的主要化疗药物。大多数肺癌患者最初对顺铂治疗有反应;然而，耐药性的发展是不可避免的，这会导致疾病进展。因此，开发治疗顺铂耐药肺癌的新策略无疑将对这些患者的治疗产生重大影响。 虽然在过去的十年中有压倒性的出版物对顺铂耐药性，但迄今为止，没有药物可以逆转顺铂耐药性或选择性地杀死这些耐药细胞。我们已经发现了顺铂耐药细胞中的新的生化变化，这些变化可以用作选择性根除它们的靶点。首先，我们已经发现，与正常细胞或其亲本细胞对应物相比，所有顺铂抗性细胞系（包括来自患者的原代培养物）具有更高的活性氧（ROS）水平。因此，增加ROS的药物（如elesclomol）可能会使它们超过耐受限度，最终导致细胞死亡。其次，这些顺铂抗性细胞由于在体外和体内条件下增加分泌而具有降低的细胞内硫氧还蛋白-1（TRX 1）水平，这可能是较高ROS水平的主要促成因素。第三，顺铂抗性细胞不再依赖于糖酵解代谢，而是依赖于氨基酸和/或脂肪酸（氧化代谢）作为其碳骨架来源。有意义的是，谷氨酰胺剥夺或脂肪酸合成途径中关键酶的抑制可以选择性地杀死顺铂耐药细胞。综上所述，我们假设细胞内TRX 1的减少，导致更高的ROS积累，可能导致顺铂耐药肿瘤的代谢重编程。 在本申请中，我们计划通过以下方式进一步证实和利用这些发现：（i）确定顺铂抗性肺癌细胞从糖酵解代谢转换为氧化代谢作为其能量和生物合成的主要碳源，（ii）研究TRX 1是ROS积累、顺铂敏感性和肿瘤代谢改变的关键因素，（iii）确定ROS产生剂或代谢抑制剂，其可以选择性地杀死顺铂抗性细胞， （iv）确定ROS、TRX 1之间的可能关系，并且在从顺铂治疗失败的患者获得的肿瘤样品中也发现肿瘤代谢的变化。为了进一步评估我们发现的临床相关性，我们将证实ROS产生剂或代谢抑制剂对来自患者的新鲜分离的顺铂耐药肺癌细胞也具有高度细胞毒性。 总的来说，这项拟议的工作将作为一种新的方法来克服顺铂耐药性，利用这些耐药细胞生存的主要生化差异。因此，通过靶向这些差异，我们可以选择性地根除这些耐药细胞，同时使正常组织毒性最小。此外，从该应用中获得的发现也可以用作研究选择性杀死其他肿瘤类型的顺铂耐药细胞的可能方法的平台。