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Zhu X, Li Y, Liu H, Wang Y, Sun R, Jiang Z, Hou C, Hou X, Huang S, Zhang H, Wang H, Jiang B, Yang X, Xu B, Fan G. NAMPT-targeting PROTAC and nicotinic acid co-administration elicit safe and robust anti-tumor efficacy in NAPRT-deficient pan-cancers. Cell Chem Biol 2024; 31:1203-1218.e17. [PMID: 38906111 DOI: 10.1016/j.chembiol.2024.05.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 04/23/2024] [Accepted: 05/22/2024] [Indexed: 06/23/2024]
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) catalyzes the biosynthesis of nicotinamide adenine dinucleotide (NAD+), making it a potential target for cancer therapy. Two challenges hinder its translation in the clinic: targeting the extracellular form of NAMPT (eNAMPT) remains insufficient, and side effects are observed in normal tissues. We previously utilized proteolysis-targeting chimera (PROTAC) to develop two compounds capable of simultaneously degrading iNAMPT and eNAMPT. Unfortunately, the pharmacokinetic properties were inadequate, and toxicities similar to those associated with traditional inhibitors arose. We have developed a next-generation PROTAC molecule 632005 to address these challenges, demonstrating exceptional target selectivity and bioavailability, improved in vivo exposure, extended half-life, and reduced clearance rate. When combined with nicotinic acid, 632005 exhibits safety and robust efficacy in treating NAPRT-deficient pan-cancers, including xenograft models with hematologic malignancy and prostate cancer and patient-derived xenograft (PDX) models with liver cancer. Our findings provide clinical references for patient selection and treatment strategies involving NAMPT-targeting PROTACs.
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Affiliation(s)
- Xiaotong Zhu
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Ye Li
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Haixia Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China; Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China; University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Yuetong Wang
- School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Renhong Sun
- Gluetacs Therapeutics (Shanghai) Co, Ltd, Building 20, Lane 218, Haiji Road 6, Pudong District, Shanghai 201306, China
| | - Zhenzhou Jiang
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Chun Hou
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Xianyu Hou
- School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Suming Huang
- The International Peace Maternity & Child Health Hospital of China Welfare Institute, Shanghai 200030, China
| | - Huijuan Zhang
- The International Peace Maternity & Child Health Hospital of China Welfare Institute, Shanghai 200030, China
| | - Haopeng Wang
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Biao Jiang
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Xiaobao Yang
- Gluetacs Therapeutics (Shanghai) Co, Ltd, Building 20, Lane 218, Haiji Road 6, Pudong District, Shanghai 201306, China.
| | - Bin Xu
- Department of Urology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200011, China.
| | - Gaofeng Fan
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China; Shanghai Clinical Research and Trial Center, Shanghai 201210, China.
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Ghanem MS, Caffa I, Monacelli F, Nencioni A. Inhibitors of NAD + Production in Cancer Treatment: State of the Art and Perspectives. Int J Mol Sci 2024; 25:2092. [PMID: 38396769 PMCID: PMC10889166 DOI: 10.3390/ijms25042092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 01/29/2024] [Accepted: 02/05/2024] [Indexed: 02/25/2024] Open
Abstract
The addiction of tumors to elevated nicotinamide adenine dinucleotide (NAD+) levels is a hallmark of cancer metabolism. Obstructing NAD+ biosynthesis in tumors is a new and promising antineoplastic strategy. Inhibitors developed against nicotinamide phosphoribosyltransferase (NAMPT), the main enzyme in NAD+ production from nicotinamide, elicited robust anticancer activity in preclinical models but not in patients, implying that other NAD+-biosynthetic pathways are also active in tumors and provide sufficient NAD+ amounts despite NAMPT obstruction. Recent studies show that NAD+ biosynthesis through the so-called "Preiss-Handler (PH) pathway", which utilizes nicotinate as a precursor, actively operates in many tumors and accounts for tumor resistance to NAMPT inhibitors. The PH pathway consists of three sequential enzymatic steps that are catalyzed by nicotinate phosphoribosyltransferase (NAPRT), nicotinamide mononucleotide adenylyltransferases (NMNATs), and NAD+ synthetase (NADSYN1). Here, we focus on these enzymes as emerging targets in cancer drug discovery, summarizing their reported inhibitors and describing their current or potential exploitation as anticancer agents. Finally, we also focus on additional NAD+-producing enzymes acting in alternative NAD+-producing routes that could also be relevant in tumors and thus become viable targets for drug discovery.
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Affiliation(s)
- Moustafa S. Ghanem
- Department of Internal Medicine and Medical Specialties (DIMI), University of Genoa, Viale Benedetto XV 6, 16132 Genoa, Italy; (I.C.); (F.M.)
| | - Irene Caffa
- Department of Internal Medicine and Medical Specialties (DIMI), University of Genoa, Viale Benedetto XV 6, 16132 Genoa, Italy; (I.C.); (F.M.)
- Ospedale Policlinico San Martino IRCCS, Largo Rosanna Benzi 10, 16132 Genova, Italy
| | - Fiammetta Monacelli
- Department of Internal Medicine and Medical Specialties (DIMI), University of Genoa, Viale Benedetto XV 6, 16132 Genoa, Italy; (I.C.); (F.M.)
- Ospedale Policlinico San Martino IRCCS, Largo Rosanna Benzi 10, 16132 Genova, Italy
| | - Alessio Nencioni
- Department of Internal Medicine and Medical Specialties (DIMI), University of Genoa, Viale Benedetto XV 6, 16132 Genoa, Italy; (I.C.); (F.M.)
- Ospedale Policlinico San Martino IRCCS, Largo Rosanna Benzi 10, 16132 Genova, Italy
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Kim M, Kim H, Kang BG, Lee J, Kim T, Lee H, Jung J, Oh MJ, Seo S, Ryu MJ, Sung Y, Lee Y, Yeom J, Han G, Cha SS, Jung H, Kim HS. Discovery of a novel NAMPT inhibitor that selectively targets NAPRT-deficient EMT-subtype cancer cells and alleviates chemotherapy-induced peripheral neuropathy. Theranostics 2023; 13:5075-5098. [PMID: 37771778 PMCID: PMC10526665 DOI: 10.7150/thno.85356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 09/05/2023] [Indexed: 09/30/2023] Open
Abstract
Background: Exploiting synthetic lethality (SL) relationships between protein pairs has emerged as an important avenue for the development of anti-cancer drugs. Nicotinamide phosphoribosyltransferase (NAMPT) is the rate-limiting enzyme of the NAD+ salvage pathway, having an SL relationship with nicotinic acid phosphoribosyltransferase (NAPRT), the key enzyme in the NAD+ Preiss-Handler pathway. NAMPT inhibitor holds clinical potential not only as a promising cancer treatment but also as a means of protection against chemotherapy-induced-peripheral-neuropathy (CIPN). However, as NAD+ is essential for normal cells, the clinical use of NAMPT inhibitors is challenging. This study aimed to identify a novel NAMPT inhibitor with enhanced selective cytotoxicity against NAPRT-deficient cancer cells as well as prominent efficacy in alleviating CIPN. Methods: We began by conducting drug derivatives screening in a panel of lung cancer cell lines to select an agent with the broadest therapeutic window between the NAPRT-negative and-positive cancer cell lines. Both in vitro and In vivo comparative analyses were conducted between A4276 and other NAMPT inhibitors to evaluate the NAPRT-negative cancer cell selectivity and the underlying distinct NAMPT inhibition mechanism of A4276. Patient-derived tumor transcriptomic data and protein levels in various cancer cell lines were analyzed to confirm the correlation between NAPRT depletion and epithelial-to-mesenchymal transition (EMT)-like features in various cancer types. Finally, the efficacy of A4276 for axonal protection and CIPN remedy was examined in vitro and in vivo. Results: The biomarker-driven phenotypic screening led to a discovery of A4276 with prominent selectivity against NAPRT-negative cancer cells compared with NAPRT-positive cancer cells and normal cells. The cytotoxic effect of A4276 on NAPRT-negative cells is achieved through its direct binding to NAMPT, inhibiting its enzymatic function at an optimal and balanced level allowing NAPRT-positive cells to survive through NAPRT-dependent NAD+ synthesis. NAPRT deficiency serves as a biomarker for the response to A4276 as well as an indicator of EMT-subtype cancer in various tumor types. Notably, A4276 protects axons from Wallerian degeneration more effectively than other NAMPT inhibitors by decreasing NMN-to-NAD+ ratio. Conclusion: This study demonstrates that A4276 selectively targets NAPRT-deficient EMT-subtype cancer cells and prevents chemotherapy-induced peripheral neuropathy, highlighting its potential as a promising anti-cancer agent for use in cancer monotherapy or combination therapy with conventional chemotherapeutics.
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Affiliation(s)
- Minjee Kim
- Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Department of Biomedical Sciences, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Hyeyoung Kim
- Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Department of Anatomy, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Bu-Gyeong Kang
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, 03760, Republic of Korea
| | - Jooyoung Lee
- Department of Biomedical Sciences, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Checkmate Therapeutics Inc., Seoul, 07207, Republic of Korea
| | - Taegun Kim
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
| | - Hwanho Lee
- Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Department of Biomedical Sciences, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Jane Jung
- Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Department of Anatomy, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Myung Joon Oh
- Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Department of Biomedical Sciences, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Seungyoon Seo
- Prometabio Research Institute, Prometabio Co., Ltd. Hanam-si, Gyeonggi-do 12939, Republic of Korea
| | - Myung-Jeom Ryu
- Department of Biomedical Sciences, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Yeojin Sung
- Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Department of Biomedical Sciences, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Yunji Lee
- Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Department of Biomedical Sciences, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Jeonghun Yeom
- Prometabio Research Institute, Prometabio Co., Ltd. Hanam-si, Gyeonggi-do 12939, Republic of Korea
| | - Gyoonhee Han
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
| | - Sun-Shin Cha
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, 03760, Republic of Korea
| | - Hosung Jung
- Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Department of Anatomy, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Hyun Seok Kim
- Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Department of Biomedical Sciences, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
- Checkmate Therapeutics Inc., Seoul, 07207, Republic of Korea
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Carreira ASA, Ravera S, Zucal C, Thongon N, Irene C, Astigiano C, Bertola N, Buongiorno A, Roccuzzo M, Bisio A, Pardini B, Nencioni A, Bruzzone S, Provenzani A. Mitochondrial rewiring drives metabolic adaptation to NAD(H) shortage in triple negative breast cancer cells. Neoplasia 2023; 41:100903. [PMID: 37148658 DOI: 10.1016/j.neo.2023.100903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 04/27/2023] [Accepted: 04/27/2023] [Indexed: 05/08/2023]
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) is a key metabolic enzyme in NAD+ synthesis pathways and is found upregulated in several tumors, depicting NAD(H) lowering agents, like the NAMPT inhibitor FK866, as an appealing approach for anticancer therapy. Like other small molecules, FK866 triggers chemoresistance, observed in several cancer cellular models, which can prevent its clinical application. The molecular mechanisms sustaining the acquired of resistance to FK866 were studied in a model of triple negative breast cancer (MDA-MB-231 parental - PAR), exposed to increasing concentrations of the small molecule (MDA-MB-231 resistant - RES). RES cells are not sensitive to verapamil or cyclosporin A, excluding a potential role of increased efflux pumps activity as a mechanism of resistance. Similarly, the silencing of the enzyme Nicotinamide Riboside Kinase 1 (NMRK1) in RES cells does not increase FK866 toxicity, excluding this pathway as a compensatory mechanism of NAD+ production. Instead, Seahorse metabolic analysis revealed an increased mitochondrial spare respiratory capacity in RES cells. These cells presented a higher mitochondrial mass compared to the FK866-sensitive counterparts, as well as an increased consumption of pyruvate and succinate for energy production. Interestingly, co-treatment of PAR cells with FK866 and the mitochondrial pyruvate carrier (MPC) inhibitors UK5099 or rosiglitazone, as well as with the transient silencing of MPC2 but not of MPC1, induces a FK866-resistant phenotype. Taken together, these results unravel novel mechanisms of cell plasticity to counteract FK866 toxicity, that, besides the previously described LDHA dependency, rely on mitochondrial rewiring at functional and energetic levels.
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Affiliation(s)
| | - Silvia Ravera
- Department of Experimental Medicine, University of Genoa, Genoa, Italy; Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Italy; Italian Institute for Genomic Medicine (IIGM), Candiolo, Italy.
| | - Chiara Zucal
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, Trento, Italy.
| | - Natthakan Thongon
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, Trento, Italy; Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Italy; Italian Institute for Genomic Medicine (IIGM), Candiolo, Italy.
| | - Caffa Irene
- Department of Internal Medicine, University of Genoa, Italy; IRCCS Ospedale Policlinico San Martino, Genoa, Italy.
| | - Cecilia Astigiano
- Department of Experimental Medicine, University of Genoa, Genoa, Italy.
| | - Nadia Bertola
- Department of Experimental Medicine, University of Genoa, Genoa, Italy.
| | - Arianna Buongiorno
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, Trento, Italy.
| | - Michela Roccuzzo
- Advanced Imaging Core Facility, Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, Trento, Italy.
| | - Alessandra Bisio
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, Trento, Italy.
| | - Barbara Pardini
- Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Italy; Italian Institute for Genomic Medicine (IIGM), Candiolo, Italy.
| | - Alessio Nencioni
- Department of Internal Medicine, University of Genoa, Italy; IRCCS Ospedale Policlinico San Martino, Genoa, Italy.
| | - Santina Bruzzone
- Department of Experimental Medicine, University of Genoa, Genoa, Italy.
| | - Alessandro Provenzani
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, Trento, Italy.
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Wei Y, Xiang H, Zhang W. Review of various NAMPT inhibitors for the treatment of cancer. Front Pharmacol 2022; 13:970553. [PMID: 36160449 PMCID: PMC9490061 DOI: 10.3389/fphar.2022.970553] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 08/01/2022] [Indexed: 11/13/2022] Open
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) is a rate-limiting enzyme in the NAD salvage pathway of mammalian cells and is overexpressed in numerous types of cancers. These include breast cancer, ovarian cancer, prostate cancer, gastric cancer, colorectal cancer, glioma, and b-cell lymphoma. NAMPT is also known to impact the NAD and NADPH pool. Research has demonstrated that NAMPT can be inhibited. NAMPT inhibitors are diverse anticancer medicines with significant anti-tumor efficacy in ex vivo tumor models. A few notable NAMPT specific inhibitors which have been produced include FK866, CHS828, and OT-82. Despite encouraging preclinical evidence of the potential utility of NAMPT inhibitors in cancer models, early clinical trials have yielded only modest results, necessitating the adaptation of additional tactics to boost efficacy. This paper examines a number of cancer treatment methods which target NAMPT, including the usage of individual inhibitors, pharmacological combinations, dual inhibitors, and ADCs, all of which have demonstrated promising experimental or clinical results. We intend to contribute further ideas regarding the usage and development of NAMPT inhibitors in clinical therapy to advance the field of research on this intriguing target.
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Affiliation(s)
- Yichen Wei
- West China School of Pharmacy, Sichuan University, Chengdu, China
- State Key Laboratory of Biotherapy and Cancer Center, Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Haotian Xiang
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, China
| | - Wenqiu Zhang
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, China
- *Correspondence: Wenqiu Zhang,
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Navas LE, Carnero A. Nicotinamide Adenine Dinucleotide (NAD) Metabolism as a Relevant Target in Cancer. Cells 2022; 11:cells11172627. [PMID: 36078035 PMCID: PMC9454445 DOI: 10.3390/cells11172627] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/25/2022] [Accepted: 08/16/2022] [Indexed: 11/22/2022] Open
Abstract
NAD+ is an important metabolite in cell homeostasis that acts as an essential cofactor in oxidation–reduction (redox) reactions in various energy production processes, such as the Krebs cycle, fatty acid oxidation, glycolysis and serine biosynthesis. Furthermore, high NAD+ levels are required since they also participate in many other nonredox molecular processes, such as DNA repair, posttranslational modifications, cell signalling, senescence, inflammatory responses and apoptosis. In these nonredox reactions, NAD+ is an ADP-ribose donor for enzymes such as sirtuins (SIRTs), poly-(ADP-ribose) polymerases (PARPs) and cyclic ADP-ribose (cADPRs). Therefore, to meet both redox and nonredox NAD+ demands, tumour cells must maintain high NAD+ levels, enhancing their synthesis mainly through the salvage pathway. NAMPT, the rate-limiting enzyme of this pathway, has been identified as an oncogene in some cancer types. Thus, NAMPT has been proposed as a suitable target for cancer therapy. NAMPT inhibition causes the depletion of NAD+ content in the cell, leading to the inhibition of ATP synthesis. This effect can cause a decrease in tumour cell proliferation and cell death, mainly by apoptosis. Therefore, in recent years, many specific inhibitors of NAMPT have been developed, and some of them are currently in clinical trials. Here we review the NAD metabolism as a cancer therapy target.
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Affiliation(s)
- Lola E. Navas
- Instituto de Biomedicina de Sevilla, IBIS, Hospital Universitario Virgen del Rocío, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, 41013 Sevilla, Spain
- CIBERONC, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Amancio Carnero
- Instituto de Biomedicina de Sevilla, IBIS, Hospital Universitario Virgen del Rocío, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, 41013 Sevilla, Spain
- CIBERONC, Instituto de Salud Carlos III, 28029 Madrid, Spain
- Correspondence:
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Wang XY, Liu KJ, Zhang FY, Xiang B. Nicotinamide mitigates radiation injury in submandibular gland by protecting mitochondrial structure and functions. J Oral Pathol Med 2022; 51:801-809. [PMID: 35996988 DOI: 10.1111/jop.13347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 06/07/2022] [Accepted: 07/25/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Radiation damage to salivary gland (SG) is inevitable in head and neck cancer patients receiving radiotherapy. Safe and effective treatments for protecting SGs from radiation are still unavailable. Mitochondrial damage is a critical mechanism in irradiated SG, however, treatment targeting mitochondria has not received much attention. Nicotinamide (NAM) is a key component of the mitochondrial metabolism. Here, we investigated the effects and underlying mechanisms of NAM on protecting irradiated submandibular gland (SMG). METHODS SMG cells and tissues were randomly divided into four groups: control, NAM alone, radiation alone, and radiation with NAM pretreatment. Cell viability was detected by PrestoBlue™ cell viability reagent. Histopathological alterations were observed with HE staining. Pilocarpine-stimulated saliva was measured from Wharton's duct. Cell apoptosis was determined by flow cytometry and TUNEL assay. Nicotinamide phosphoribosyl transferase (NAMPT) was examined with immunofluorescence. The levels of nicotinamide adenine dinucleotide (NAD), mitochondrial membrane potential (MMP) and ATP were measured with the relevant kits. The mitochondrial ultrastructure was observed under transmission electron microscopy. RESULTS NAM significantly mitigated radiation damage both in vitro and in vivo. Also, NAM improved saliva secretion and reduced radiation-induced apoptosis in irradiated SMGs. Moreover, NAM improved NAMPT and the levels of NAD/ATP and MMP, all of which were decreased by radiation in SMG cells. Importantly, NAM protected the mitochondrial ultrastructure from radiation. CONCLUSION These findings demonstrate that NAM alleviates radiation damage in SMG by replenishing NAD and maintaining mitochondrial function and ultrastructure, suggesting that NAM could be used as a prospective radioprotectant for preventing radiation sialadenitis.
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Affiliation(s)
- Xin Yue Wang
- Laboratory of Oral and Maxillofacial Disease, Second Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Ke Jian Liu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico Health Sciences Center, Albuquerque, USA
| | - Fu Yin Zhang
- Department of Oral Surgery, Second Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Bin Xiang
- Laboratory of Oral and Maxillofacial Disease, Second Hospital of Dalian Medical University, Dalian, Liaoning, China
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Zhang K, Wang K, Zhang X, Qian Z, Zhang W, Zheng X, Wang J, Jiang Y, Zhang W, Lu Z, Hao H, Jiang S. Discovery of Small Molecules Simultaneously Targeting NAD(P)H:Quinone Oxidoreductase 1 and Nicotinamide Phosphoribosyltransferase: Treatment of Drug-Resistant Non-small-Cell Lung Cancer. J Med Chem 2022; 65:7746-7769. [PMID: 35640078 DOI: 10.1021/acs.jmedchem.2c00077] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Targeting NAD+ metabolism has emerged as an effective anticancer strategy. Inspired by the synergistic antitumor effect between NAD(P)H:quinone oxidoreductase 1 (NQO1) substrates increasing the NAD consumption and nicotinamide phosphoribosyltransferase (NAMPT) inhibitors hampering the NAD synthesis, first-in-class small molecules simultaneously targeting NQO1 and NAMPT were identified through structure-based design. In particular, compound 10d is an excellent NQO1 substrate that is processed faster than TSA by NQO1 and exhibited a slightly decreased NAMPT inhibitory potency than that of FK866. It can selectively inhibit the proliferation of NQO1-overexpressing A549 cells and taxol-resistant A549/taxol cells and also induce cell apoptosis and inhibit cell migration in an NQO1- and NAMPT-dependent manner in A549/taxol cells. Significantly, compound 10d demonstrated excellent in vivo antitumor efficacy in the A549/taxol xenograft models with no significant toxicity. This proof-of-concept study affirms the feasibility of discovering small molecules that target NQO1 and NAMPT simultaneously, and it also provides a novel, effective, and selective anticancer strategy.
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Affiliation(s)
- Kuojun Zhang
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Kaizhen Wang
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Xiangyu Zhang
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Zhenlong Qian
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Wenbo Zhang
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Xiao Zheng
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Jiaying Wang
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Yin Jiang
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Wanheng Zhang
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Zhiyu Lu
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Haiping Hao
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Sheng Jiang
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
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9
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Different Effects of RNAi-Mediated Downregulation or Chemical Inhibition of NAMPT in an Isogenic IDH Mutant and Wild-Type Glioma Cell Model. Int J Mol Sci 2022; 23:ijms23105787. [PMID: 35628596 PMCID: PMC9143996 DOI: 10.3390/ijms23105787] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 05/13/2022] [Accepted: 05/13/2022] [Indexed: 12/13/2022] Open
Abstract
The IDH1R132H mutation in glioma results in the neoenzymatic function of IDH1, leading to the production of the oncometabolite 2-hydroxyglutarate (2-HG), alterations in energy metabolism and changes in the cellular redox household. Although shifts in the redox ratio NADPH/NADP+ were described, the consequences for the NAD+ synthesis pathways and potential therapeutic interventions were largely unexplored. Here, we describe the effects of heterozygous IDH1R132H on the redox system in a CRISPR/Cas edited glioblastoma model and compare them with IDH1 wild-type (IDH1wt) cells. Besides an increase in 2-HG and decrease in NADPH, we observed an increase in NAD+ in IDH1R132H glioblastoma cells. RT-qPCR analysis revealed the upregulation of the expression of the NAD+ synthesis enzyme nicotinamide phosphoribosyltransferase (NAMPT). Knockdown of NAMPT resulted in significantly reduced viability in IDH1R132H glioblastoma cells. Given this dependence of IDH1R132H cells on NAMPT expression, we explored the effects of the NAMPT inhibitors FK866, GMX1778 and GNE-617. Surprisingly, these agents were equally cytotoxic to IDH1R132H and IDH1wt cells. Altogether, our results indicate that targeting the NAD+ synthesis pathway is a promising therapeutic strategy in IDH mutant gliomas; however, the agent should be carefully considered since three small-molecule inhibitors of NAMPT tested in this study were not suitable for this purpose.
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PAK4 and NAMPT as Novel Therapeutic Targets in Diffuse Large B-Cell Lymphoma, Follicular Lymphoma, and Mantle Cell Lymphoma. Cancers (Basel) 2021; 14:cancers14010160. [PMID: 35008323 PMCID: PMC8750170 DOI: 10.3390/cancers14010160] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 10/21/2021] [Accepted: 10/25/2021] [Indexed: 11/30/2022] Open
Abstract
Simple Summary Non-Hodgkin’s lymphomas (NHL) are cancers of the white blood cells. While some NHL subtypes, such as Diffuse large B-cell lymphoma (DLBCL) and mantle cell lymphoma (MCL), grow and spread aggressively, others, like follicular lymphoma (FL), are indolent in nature. Irrespective of how fast they grow, all NHL subtypes can spread to other organs in the body if not treated. In this study, we have demonstrated that the targeted inhibition of p21-activated kinase 4 (PAK4) and nicotinamide phosphoribosyl transferase (NAMPT) in different NHL subtypes by a novel, orally bioavailable, dual inhibitor KPT-9274 can lead to energy depletion, inhibition of cell proliferation, and ultimately apoptosis. KPT-9274 treatment shows potent anti-tumor effects in DLBCL and MCL subcutaneous xenograft models and enhances mice survival in a systemic FL model. Therefore, this study demonstrates the potential of targeting PAK4 and NAMPT by a small molecule inhibitor KPT-9274 for NHL therapy. Abstract Diffuse large B-cell lymphoma (DLBCL), grade 3b follicular lymphoma (FL), and mantle cell lymphoma (MCL) are aggressive non-Hodgkin’s lymphomas (NHL). Cure rates are suboptimal and novel treatment strategies are needed to improve outcomes. Here, we show that p21-activated kinase 4 (PAK4) and nicotinamide phosphoribosyl transferase (NAMPT) is critical for lymphoma subsistence. Dual targeting of PAK4-NAMPT by the Phase I small molecule KPT-9274 suppressed cell proliferation in DLBCL, FL, and MCL. Growth inhibition was concurrent with apoptosis induction alongside activation of pro-apoptotic proteins and reduced pro-survival markers. We observed NAD suppression, ATP reduction, and consequent cellular metabolic collapse in lymphoma cells due to KPT-9274 treatment. KPT-9274 in combination with standard-of-care chemotherapeutics led to superior inhibition of cell proliferation. In vivo, KPT-9274 could markedly suppress the growth of WSU-DLCL2 (DLBCL), Z-138, and JeKo-1 (MCL) sub-cutaneous xenografts, and a remarkable increase in host life span was shown, with a 50% cure of a systemic WSU-FSCCL (FL) model. Residual tumor analysis confirmed a reduction in total and phosphorylated PAK4 and activation of the pro-apoptotic cascade. This study, using various preclinical experimental models, demonstrates the therapeutic potential of targeting PAK4-NAMPT in DLBCL, FL, and MCL. The orally bioavailable, safe, and efficacious PAK4-NAMPT dual inhibitor KPT-9274 warrants further clinical investigation.
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NAPRT Expression Regulation Mechanisms: Novel Functions Predicted by a Bioinformatics Approach. Genes (Basel) 2021; 12:genes12122022. [PMID: 34946971 PMCID: PMC8700865 DOI: 10.3390/genes12122022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/14/2021] [Accepted: 12/15/2021] [Indexed: 12/13/2022] Open
Abstract
The nicotinate phosphoribosyltransferase (NAPRT) gene has gained relevance in the research of cancer therapeutic strategies due to its main role as a NAD biosynthetic enzyme. NAD metabolism is an attractive target for the development of anti-cancer therapies, given the high energy requirements of proliferating cancer cells and NAD-dependent signaling. A few studies have shown that NAPRT expression varies in different cancer types, making it imperative to assess NAPRT expression and functionality status prior to the application of therapeutic strategies targeting NAD. In addition, the recent finding of NAPRT extracellular form (eNAPRT) suggested the involvement of NAPRT in inflammation and signaling. However, the mechanisms regulating NAPRT gene expression have never been thoroughly addressed. In this study, we searched for NAPRT gene expression regulatory mechanisms in transcription factors (TFs), RNA binding proteins (RBPs) and microRNA (miRNAs) databases. We identified several potential regulators of NAPRT transcription activation, downregulation and alternative splicing and performed GO and expression analyses. The results of the functional analysis of TFs, RBPs and miRNAs suggest new, unexpected functions for the NAPRT gene in cell differentiation, development and neuronal biology.
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12
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Mechanisms of Dangua Recipe in Improving Glycolipid Metabolic Disorders Based on Transcriptomics. Chin J Integr Med 2021; 28:130-137. [PMID: 34755288 DOI: 10.1007/s11655-021-3337-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/13/2020] [Indexed: 10/19/2022]
Abstract
OBJECTIVE To explore the mechanisms of Dangua Recipe (DGR) in improving glycolipid metabolism based on transcriptomics. METHODS Sprague-Dawley rats with normal glucose level were divided into 3 groups according to a random number table, including a conventional diet group (Group A), a DGR group (Group B, high-calorie diet + 20.5 g DGR), and a high-calorie fodder model group (Group C). After 12 weeks of intervention, the liver tissue of rats was taken. Gene sequence and transcriptional analysis were performed to identify the key genes related to glycolipid metabolism reflecting DGR efficacy, and then gene or protein validation of liver tissue were performed. Nicotinamide phosphoribosyl transferase (Nampt) and phosphoenolpyruvate carboxykinase (PEPCK) proteins in liver tissues were detected by enzyme linked immunosorbent assay, fatty acid synthase (FASN) protein was detected by Western blot, and fatty acid binding protein 5 (FABP5)-mRNA was detected by quantitative real-time polymerase chain reaction. Furthermore, the functional verification was performed on the diabetic model rats by Nampt blocker (GEN-617) injected in vivo. Hemoglobin A1c (HbA1c), plasma total cholesterol and triglycerides were detected. RESULTS Totally, 257 differential-dominant genes of Group A vs. Group C and 392 differential-dominant genes of Group B vs. Group C were found. Moreover, 11 Gene Ontology molecular function terms and 7 Kyoto Encyclopedia of Genes and Genomes enrichment pathways owned by both Group A vs. Group C and Group C vs. Group B were confirmed. The liver tissue target validation showed that Nampt, FASN, PEPCK protein and FABP5-mRNA had the same changes consistent with transcriptome. The in vivo functional tests showed that GEN-617 increased body weight, HbA1c, triglyceride and total cholesterol levels in the diabetic rats (P<;0.05 or P<;0.01); while all the above-mentioned levels (except triglyceride) were decreased significantly by GEN-617 combined with DGR intervention (P<;0.05 or P<;0.01). CONCLUSION Nampt activation was one of the mechanisms about DGR regulating glycolipid metabolism.
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13
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Ghanem MS, Monacelli F, Nencioni A. Advances in NAD-Lowering Agents for Cancer Treatment. Nutrients 2021; 13:1665. [PMID: 34068917 PMCID: PMC8156468 DOI: 10.3390/nu13051665] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 05/04/2021] [Accepted: 05/08/2021] [Indexed: 12/13/2022] Open
Abstract
Nicotinamide adenine dinucleotide (NAD) is an essential redox cofactor, but it also acts as a substrate for NAD-consuming enzymes, regulating cellular events such as DNA repair and gene expression. Since such processes are fundamental to support cancer cell survival and proliferation, sustained NAD production is a hallmark of many types of neoplasms. Depleting intratumor NAD levels, mainly through interference with the NAD-biosynthetic machinery, has emerged as a promising anti-cancer strategy. NAD can be generated from tryptophan or nicotinic acid. In addition, the "salvage pathway" of NAD production, which uses nicotinamide, a byproduct of NAD degradation, as a substrate, is also widely active in mammalian cells and appears to be highly exploited by a subset of human cancers. In fact, research has mainly focused on inhibiting the key enzyme of the latter NAD production route, nicotinamide phosphoribosyltransferase (NAMPT), leading to the identification of numerous inhibitors, including FK866 and CHS-828. Unfortunately, the clinical activity of these agents proved limited, suggesting that the approaches for targeting NAD production in tumors need to be refined. In this contribution, we highlight the recent advancements in this field, including an overview of the NAD-lowering compounds that have been reported so far and the related in vitro and in vivo studies. We also describe the key NAD-producing pathways and their regulation in cancer cells. Finally, we summarize the approaches that have been explored to optimize the therapeutic response to NAMPT inhibitors in cancer.
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Affiliation(s)
- Moustafa S. Ghanem
- Department of Internal Medicine and Medical Specialties (DIMI), University of Genoa, Viale Benedetto XV 6, 16132 Genoa, Italy; (M.S.G.); (F.M.)
| | - Fiammetta Monacelli
- Department of Internal Medicine and Medical Specialties (DIMI), University of Genoa, Viale Benedetto XV 6, 16132 Genoa, Italy; (M.S.G.); (F.M.)
- Ospedale Policlinico San Martino IRCCS, Largo Rosanna Benzi 10, 16132 Genova, Italy
| | - Alessio Nencioni
- Department of Internal Medicine and Medical Specialties (DIMI), University of Genoa, Viale Benedetto XV 6, 16132 Genoa, Italy; (M.S.G.); (F.M.)
- Ospedale Policlinico San Martino IRCCS, Largo Rosanna Benzi 10, 16132 Genova, Italy
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Sauer H, Kampmann H, Khosravi F, Sharifpanah F, Wartenberg M. The nicotinamide phosphoribosyltransferase antagonist FK866 inhibits growth of prostate tumour spheroids and increases doxorubicin retention without changes in drug transporter and cancer stem cell protein expression. Clin Exp Pharmacol Physiol 2021; 48:422-434. [PMID: 33349973 DOI: 10.1111/1440-1681.13452] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 12/03/2020] [Indexed: 12/12/2022]
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) is a rate-limiting enzyme for nicotinamide adenine dinucleotide (NAD) synthesis and is involved in cancer cell proliferation through regulation of energy production pathways. Therefore, NAMPT inhibitors are promising drugs for cancer therapy by limiting energy supply of tumours. Herein, we demonstrated that the NAMPT inhibitor FK866 ((E)-N-(4-(1-Benzoylpiperidin-4-yl)butyl)-3-(pyridin-3-yl)acrylamide) dose-dependently inhibited growth and cell motility of DU-145 prostate tumour spheroids and decreased the intracellular ATP concentration. The apoptosis marker cleaved caspase-3 remained unchanged, but the autophagy marker microtubule-associated protein 1A/1B-light chain 3 (LC3) was upregulated. Growth inhibition was reversed upon co-administration of NAD to the cell culture medium. FK866 decreased calcein as well as pheophorbide A efflux from tumour spheroids and increased doxorubicin toxicity, indicating interference with function of drug efflux transporters. DU-145 multicellular tumour spheroids expressed the stem cell associated markers CD133, CD44, Oct4, Nanog, Sox2, and drug transporters ABCB1, ABCG2, and ABCC1 which are associated with stem cell properties in cancer cells. The ABCB1 inhibitor zosuquidar, the ABCG2 inhibitor Ko143, and the ABCC1 inhibitor MK571 increased calcein retention. Neither protein expression of stem cell markers, nor drug transporters was significantly changed upon FK866 treatment. In conclusion, our data suggest that FK866 inhibits prostate cancer cell proliferation by interference with the energy metabolism, and function of drug efflux transporters.
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Affiliation(s)
- Heinrich Sauer
- Department of Physiology, Faculty of Medicine, Justus Liebig University, Gießen, Germany
| | - Henning Kampmann
- Department of Physiology, Faculty of Medicine, Justus Liebig University, Gießen, Germany
| | - Farhad Khosravi
- Department of Physiology, Faculty of Medicine, Justus Liebig University, Gießen, Germany
| | - Fatemeh Sharifpanah
- Department of Physiology, Faculty of Medicine, Justus Liebig University, Gießen, Germany
| | - Maria Wartenberg
- Department of Cardiology, University Heart Center, Jena University Hospital, Jena, Germany
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15
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Audrito V, Messana VG, Deaglio S. NAMPT and NAPRT: Two Metabolic Enzymes With Key Roles in Inflammation. Front Oncol 2020; 10:358. [PMID: 32266141 PMCID: PMC7096376 DOI: 10.3389/fonc.2020.00358] [Citation(s) in RCA: 109] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 03/02/2020] [Indexed: 12/13/2022] Open
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) and nicotinate phosphoribosyltransferase (NAPRT) are two intracellular enzymes that catalyze the first step in the biosynthesis of NAD from nicotinamide and nicotinic acid, respectively. By fine tuning intracellular NAD levels, they are involved in the regulation/reprogramming of cellular metabolism and in the control of the activity of NAD-dependent enzymes, including sirtuins, PARPs, and NADases. However, during evolution they both acquired novel functions as extracellular endogenous mediators of inflammation. It is well-known that cellular stress and/or damage induce release in the extracellular milieu of endogenous molecules, called alarmins or damage-associated molecular patterns (DAMPs), which modulate immune functions through binding pattern recognition receptors (PRRs), such as Toll-like receptors (TLRs), and activate inflammatory responses. Increasing evidence suggests that extracellular (e)NAMPT and eNAPRT are novel soluble factors with cytokine/adipokine/DAMP-like actions. Elevated eNAMPT were reported in several metabolic and inflammatory disorders, including obesity, diabetes, and cancer, while eNAPRT is emerging as a biomarker of sepsis and septic shock. This review will discuss available data concerning the dual role of this unique family of enzymes.
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Affiliation(s)
- Valentina Audrito
- Laboratory of Tumor Immunogenetics, Department of Medical Sciences, University of Turin, Turin, Italy
| | - Vincenzo Gianluca Messana
- Laboratory of Tumor Immunogenetics, Department of Medical Sciences, University of Turin, Turin, Italy
| | - Silvia Deaglio
- Laboratory of Tumor Immunogenetics, Department of Medical Sciences, University of Turin, Turin, Italy
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16
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Murphy JP, Giacomantonio MA, Paulo JA, Everley RA, Kennedy BE, Pathak GP, Clements DR, Kim Y, Dai C, Sharif T, Gygi SP, Gujar S. The NAD + Salvage Pathway Supports PHGDH-Driven Serine Biosynthesis. Cell Rep 2020; 24:2381-2391.e5. [PMID: 30157431 DOI: 10.1016/j.celrep.2018.07.086] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Revised: 07/13/2018] [Accepted: 07/26/2018] [Indexed: 01/13/2023] Open
Abstract
NAD+ is a key metabolic redox cofactor that is regenerated from nicotinamide through the NAD+ salvage pathway. Here, we find that inhibiting the NAD+ salvage pathway depletes serine biosynthesis from glucose by impeding the NAD+-dependent protein, 3-phosphoglycerate dehydrogenase (PHGDH). Importantly, we find that PHGDHhigh breast cancer cell lines are exquisitely sensitive to inhibition of the NAD+ salvage pathway. Further, we find that PHGDH protein levels and those of the rate-limiting enzyme of NAD+ salvage, NAMPT, correlate in ER-negative, basal-like breast cancers. Although NAD+ salvage pathway inhibitors are actively being pursued in cancer treatment, their efficacy has been poor, and our findings suggest that they may be effective for PHGDH-dependent cancers.
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Affiliation(s)
- J Patrick Murphy
- Department of Pathology, Dalhousie University, Halifax, NS, Canada; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
| | | | - Joao A Paulo
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Robert A Everley
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Barry E Kennedy
- Department of Pathology, Dalhousie University, Halifax, NS, Canada; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
| | - Gopal P Pathak
- Department of Pathology, Dalhousie University, Halifax, NS, Canada; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
| | - Derek R Clements
- Department of Pathology, Dalhousie University, Halifax, NS, Canada
| | - Youra Kim
- Department of Pathology, Dalhousie University, Halifax, NS, Canada
| | - Cathleen Dai
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
| | - Tanveer Sharif
- Department of Pathology, Dalhousie University, Halifax, NS, Canada; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
| | - Steven P Gygi
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA.
| | - Shashi Gujar
- Department of Pathology, Dalhousie University, Halifax, NS, Canada; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada; Centre for Innovative and Collaborative Health Services Research, IWK Health Centre, Halifax, NS, Canada; Department of Biology, Dalhousie University, Halifax, NS, Canada.
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17
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Wu Y, Wang L, Huang Y, Chen S, Wu S, Dong G, Sheng C. Nicotinamide Phosphoribosyltransferase (NAMPT) Is a New Target of Antitumor Agent Chidamide. ACS Med Chem Lett 2020; 11:40-44. [PMID: 31938461 DOI: 10.1021/acsmedchemlett.9b00407] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 12/13/2019] [Indexed: 02/07/2023] Open
Abstract
Chidamide is a histone deacetylase (HDAC) inhibitor that is currently used to treat cutaneous T-cell lymphoma in clinic. Herein nicotinamide phosphoribosyltransferase (NAMPT) was identified to be a new target of chidamide on the basis of the pharmacophore analysis, molecular docking, biological assays, inhibitor design, and structure-activity relationship study. The polypharmacology of chidamide will provide important information for better understanding its antitumor mechanism. Also, design of dual NAMPT/HDAC inhibitors may serve as an effective strategy to develop novel antitumor agents.
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Affiliation(s)
- Ying Wu
- Department of Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Lei Wang
- Department of Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Yahui Huang
- Department of Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Shuqiang Chen
- Department of Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Shanchao Wu
- Department of Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Guoqiang Dong
- Department of Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Chunquan Sheng
- Department of Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, China
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18
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Korotchkina L, Kazyulkin D, Komarov PG, Polinsky A, Andrianova EL, Joshi S, Gupta M, Vujcic S, Kononov E, Toshkov I, Tian Y, Krasnov P, Chernov MV, Veith J, Antoch MP, Middlemiss S, Somers K, Lock RB, Norris MD, Henderson MJ, Haber M, Chernova OB, Gudkov AV. OT-82, a novel anticancer drug candidate that targets the strong dependence of hematological malignancies on NAD biosynthesis. Leukemia 2020; 34:1828-1839. [PMID: 31896781 DOI: 10.1038/s41375-019-0692-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 11/23/2019] [Accepted: 12/06/2019] [Indexed: 02/06/2023]
Abstract
Effective treatment of some types of cancer can be achieved by modulating cell lineage-specific rather than tumor-specific targets. We conducted a systematic search for novel agents selectively toxic to cells of hematopoietic origin. Chemical library screenings followed by hit-to-lead optimization identified OT-82, a small molecule with strong efficacy against hematopoietic malignancies including acute myeloblastic and lymphoblastic adult and pediatric leukemias, erythroleukemia, multiple myeloma, and Burkitt's lymphoma in vitro and in mouse xenograft models. OT-82 was also more toxic towards patients-derived leukemic cells versus healthy bone marrow-derived hematopoietic precursors. OT-82 was shown to induce cell death by inhibiting nicotinamide phosphoribosyltransferase (NAMPT), the rate-limiting enzyme in the salvage pathway of NAD synthesis. In mice, optimization of OT-82 dosing and dietary niacin further expanded the compound's therapeutic index. In toxicological studies conducted in mice and nonhuman primates, OT-82 showed no cardiac, neurological or retinal toxicities observed with other NAMPT inhibitors and had no effect on mouse aging or longevity. Hematopoietic and lymphoid organs were identified as the primary targets for dose limiting toxicity of OT-82 in both species. These results reveal strong dependence of neoplastic cells of hematopoietic origin on NAMPT and introduce OT-82 as a promising candidate for the treatment of hematological malignancies.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | - Jean Veith
- Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | | | | | | | | | - Murray D Norris
- Children's Cancer Institute, Sydney, NSW, Australia.,University of New South Wales Centre for Childhood Cancer Research, Sydney, NSW, Australia
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19
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Managò A, Audrito V, Mazzola F, Sorci L, Gaudino F, Gizzi K, Vitale N, Incarnato D, Minazzato G, Ianniello A, Varriale A, D'Auria S, Mengozzi G, Politano G, Oliviero S, Raffaelli N, Deaglio S. Extracellular nicotinate phosphoribosyltransferase binds Toll like receptor 4 and mediates inflammation. Nat Commun 2019; 10:4116. [PMID: 31511522 PMCID: PMC6739309 DOI: 10.1038/s41467-019-12055-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 08/14/2019] [Indexed: 12/17/2022] Open
Abstract
Damage-associated molecular patterns (DAMPs) are molecules that can be actively or passively released by injured tissues and that activate the immune system. Here we show that nicotinate phosphoribosyltransferase (NAPRT), detected by antibody-mediated assays and mass spectrometry, is an extracellular ligand for Toll-like receptor 4 (TLR4) and a critical mediator of inflammation, acting as a DAMP. Exposure of human and mouse macrophages to NAPRT activates the inflammasome and NF-κB for secretion of inflammatory cytokines. Furthermore, NAPRT enhances monocyte differentiation into macrophages by inducing macrophage colony-stimulating factor. These NAPRT-induced effects are independent of NAD-biosynthetic activity, but rely on NAPRT binding to TLR4. In line with our finding that NAPRT mediates endotoxin tolerance in vitro and in vivo, sera from patients with sepsis contain the highest levels of NAPRT, compared to patients with other chronic inflammatory conditions. Together, these data identify NAPRT as a endogenous ligand for TLR4 and a mediator of inflammation. The enzyme nicotinate phosphoribosyltransferase (NAPRT) mediates the rate-limiting step in NAD salvage pathway starting from nicotinic acid. Here the authors show that NAPRT can be detected extracellularly, binds to Toll like receptor 4, and activates NF-kB signaling and cytokine production in macrophage via NAD synthesis-independent pathways.
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Affiliation(s)
- Antonella Managò
- Department of Medical Sciences, University of Turin, Turin, Italy
| | | | - Francesca Mazzola
- Department of Clinical Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Leonardo Sorci
- Department of Materials, Environmental Sciences and Urban Planning, Division of Bioinformatics and Biochemistry, Polytechnic University of Marche, Ancona, Italy
| | - Federica Gaudino
- Department of Medical Sciences, University of Turin, Turin, Italy
| | | | - Nicoletta Vitale
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - Danny Incarnato
- Department of Molecular Genetics, Groningen Biomolecular Sciences and Biotechnology Institute (GBB), University of Groningen, Groningen, The Netherlands
| | - Gabriele Minazzato
- Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Alice Ianniello
- Department of Laboratory Medicine, Azienda Ospedaliero-Universitaria Città della Salute e della Scienza, Turin, Italy
| | | | | | - Giulio Mengozzi
- Department of Laboratory Medicine, Azienda Ospedaliero-Universitaria Città della Salute e della Scienza, Turin, Italy
| | - Gianfranco Politano
- Department of Control and Computer Engineering, Polytechnic University of Turin, Turin, Italy
| | - Salvatore Oliviero
- Italian Institute for Genomic Medicine, Turin, Italy.,Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
| | - Nadia Raffaelli
- Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Silvia Deaglio
- Department of Medical Sciences, University of Turin, Turin, Italy.
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20
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Li XQ, Lei J, Mao LH, Wang QL, Xu F, Ran T, Zhou ZH, He S. NAMPT and NAPRT, Key Enzymes in NAD Salvage Synthesis Pathway, Are of Negative Prognostic Value in Colorectal Cancer. Front Oncol 2019; 9:736. [PMID: 31448236 PMCID: PMC6691178 DOI: 10.3389/fonc.2019.00736] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 07/22/2019] [Indexed: 12/28/2022] Open
Abstract
Nicotinamide adenine dinucleotide (NAD) is a profoundly important cofactor in redox reactions. Nicotinamide phosphoribosyltransferase (NAMPT) and nicotinate phosphoribosyltransferase (NAPRT) are key enzymes for NAD salvage biosynthesis pathway, which reciprocally synthesize NAD to supply the main source of NAD biosythesis. However, the prognostic value of NAMPT and NAPRT in colorectal cancer (CRC) remains largely unknown. Our present study detected NAMPT and NAPRT protein expression in cancer and adjacent tissues from 261 CRC using immunohistochemical staining. We found that high expression of NAMPT or NAPRT was associated with vascular invasion, invasion depth and advanced TNM stage in CRC. High expression of NAMPT or NAPRT predicts short overall survival and disease-free survival time in CRC patients, which were further confirmed by public datasets. Furthermore, positive correlation between expression of NAMPT and NAPRT was revealed in CRC tissues and cell lines. NAPRThigh/NAMPThigh patients tended to have the shortest survival time. Using the TCGA RNA-sequencing data, we showed that gene amplification, mutation, and methylation of NAPRT are more common than NAMPT. On the other hand, NAMPT gene might be targeted by more miRNAs. Finally, genes that are correlated with NAPRT or NAMPT are enriched in different pathways. In conclusion, we found that high expression of NAMPT or NAPRT predicts poor prognosis of CRC patients, but the regulatory mechanism might be distinct from each other.
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Affiliation(s)
- Xiao-Qin Li
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jing Lei
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Lin-Hong Mao
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Qing-Liang Wang
- Department of Pathology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Feng Xu
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Tao Ran
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zhi-Hang Zhou
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Song He
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
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21
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Yamaguchi D, Imaizumi T, Yagi K, Matsumoto Y, Nakashima T, Hirose A, Kashima N, Nosaka Y, Hamada T, Okawa K, Nishiya Y, Kubo K. Nicotinamide phosphoribosyltransferase is a molecular target of potent anticancer agents identified from phenotype-based drug screening. Sci Rep 2019; 9:7742. [PMID: 31123329 PMCID: PMC6533267 DOI: 10.1038/s41598-019-43994-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 04/26/2019] [Indexed: 12/30/2022] Open
Abstract
Phenotypic screening in drug discovery has been revived with the expectation of providing promising lead compounds and drug targets and improving the success rate of drug approval. However, target identification remains a major bottleneck in phenotype-based drug discovery. We identified the lead compounds K542 and K405 with a selective inhibition of cell viability against sphingosine-1-phosphate lyase 1 (SGPL1)-transduced ES-2 cells by phenotypic screening. We therefore performed an in vivo pharmacological examination and observed the antitumor activity of K542 in an HT-1080 tumor-bearing mouse xenograft model. SGPL1 was expected to be a therapeutic target in some cancers, suggesting that these lead molecules might be promising candidates; however, their mechanisms of action still remain unexplained. We therefore synthesized the affinity probe Ind-tag derived from K542 and identified the proteins binding to Ind-tag via a pull-down experiment. Proteomics and biochemical analyses revealed that the target molecule of these lead compounds was Nicotinamide phosphoribosyltransferase (NAMPT). We established K542-resistant DLD-1 and HT-1080 cells, and genetic analyses of these cells identified a missense mutation in the NAMPT-encoding gene. This enzymatic experiment clearly showed that K393 exerts enzymatic inhibition against NAMPT. These proteomics, genetics and biochemical analyses clarified that compounds K542 and K405 were NAMPT inhibitors.
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Affiliation(s)
- Daisuke Yamaguchi
- Small Molecule Drug Research Laboratories, Research Functions Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., 1188, Shimotogari, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8731, Japan.
| | - Takamichi Imaizumi
- Small Molecule Drug Research Laboratories, Research Functions Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., 1188, Shimotogari, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8731, Japan
| | - Kaori Yagi
- Corporate Social Responsibility Management Department, Kyowa Hakko Kirin Co., Ltd., 1-9-2, Ote-machi, Chiyoda-ku, Tokyo, 100-0004, Japan
| | - Yuichi Matsumoto
- Corporate Strategy & Planning Department, Kyowa Hakko Kirin Co., Ltd., 1-9-2, Ote-machi, Chiyoda-ku, Tokyo, 100-0004, Japan
| | - Takayuki Nakashima
- Research Core Function Laboratories, Research Functions Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., 1188, Shimotogari, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8731, Japan
| | - Akiyo Hirose
- Open Innovation Department, R&D Division, Kyowa Hakko Kirin Co., Ltd., 3-6-6, Asahi-machi, Machida-shi, Tokyo, 194-8533, Japan
| | - Naomi Kashima
- Clinical Sciences Research Laboratories, Translational Research Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., 1188, Shimotogari, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8731, Japan
| | - Yukino Nosaka
- Research Core Function Laboratories, Research Functions Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., 1188, Shimotogari, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8731, Japan
| | - Tomoko Hamada
- Small Molecule Drug Research Laboratories, Research Functions Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., 1188, Shimotogari, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8731, Japan
| | - Katsuya Okawa
- Fuji Research Park, R&D Division, Kyowa Hakko Kirin Co., Ltd., 1188, Shimotogari, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8731, Japan
| | - Yoichi Nishiya
- Small Molecule Drug Research Laboratories, Research Functions Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., 1188, Shimotogari, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8731, Japan
| | - Kazuo Kubo
- R&D Planning Department, R&D Division, Kyowa Hakko Kirin Co., Ltd., 1-9-2, Ote-machi, Chiyoda-ku, Tokyo, 100-0004, Japan.,Department of Biosciences & Informatics, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama-shi, Kanagawa, 223-8522, Japan
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22
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Audrito V, Managò A, Gaudino F, Deaglio S. Targeting metabolic reprogramming in metastatic melanoma: The key role of nicotinamide phosphoribosyltransferase (NAMPT). Semin Cell Dev Biol 2019; 98:192-201. [PMID: 31059816 DOI: 10.1016/j.semcdb.2019.05.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 05/02/2019] [Accepted: 05/02/2019] [Indexed: 12/13/2022]
Abstract
Cancer cells rewire their metabolism to support proliferation, growth and survival. In metastatic melanoma the BRAF oncogenic pathway is a master regulator of this process, highlighting the importance of metabolic reprogramming in the pathogenesis of this tumor and offering potential therapeutic approaches. Metabolic adaptation of melanoma cells generally requires increased amounts of NAD+, an essential redox cofactor in cellular metabolism and a signaling molecule. Nicotinamide phosphoribosyltransferase (NAMPT) is the most important NAD+ biosynthetic enzyme in mammalian cells and a direct target of the BRAF oncogenic signaling pathway. These findings suggest that NAMPT is an attractive new therapeutic target, particularly in combination strategies with BRAF or MEK inhibitors. Here we review current knowledge on how oncogenic signaling reprograms metabolism in BRAF-mutated melanoma, and discuss how NAMPT/NAD+ axis contributes to these processes. Lastly, we present evidence supporting a role of NAMPT as a novel therapeutic target in metastatic melanoma.
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Affiliation(s)
- Valentina Audrito
- Department of Medical Sciences, University of Turin, Turin, Italy; Italian Institute for Genomic Medicine, Turin, Italy.
| | - Antonella Managò
- Department of Medical Sciences, University of Turin, Turin, Italy; Italian Institute for Genomic Medicine, Turin, Italy
| | - Federica Gaudino
- Department of Medical Sciences, University of Turin, Turin, Italy; Italian Institute for Genomic Medicine, Turin, Italy
| | - Silvia Deaglio
- Department of Medical Sciences, University of Turin, Turin, Italy; Italian Institute for Genomic Medicine, Turin, Italy.
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23
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Liederer BM, Cheong J, Chou KJ, Dragovich PS, Le H, Liang X, Ly J, Mukadam S, Oeh J, Sampath D, Wang L, Wong S. Preclinical assessment of the ADME, efficacy and drug-drug interaction potential of a novel NAMPT inhibitor. Xenobiotica 2019; 49:1063-1077. [PMID: 30257601 DOI: 10.1080/00498254.2018.1528407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
GNE-617 (N-(4-((3,5-difluorophenyl)sulfonyl)benzyl)imidazo[1,2-a]pyridine-6-carboxamide) is a potent, selective nicotinamide phosphoribosyltransferase (NAMPT) inhibitor being explored as a potential treatment for human cancers. Plasma clearance was low in monkeys and dogs (9.14 mL min-1 kg-1 and 4.62 mL min-1 kg-1, respectively) and moderate in mice and rats (36.4 mL min-1 kg-1 and 19.3 mL min-1 kg-1, respectively). Oral bioavailability in mice, rats, monkeys and dogs was 29.7, 33.9, 29.4 and 65.2%, respectively. Allometric scaling predicted a low clearance of 3.3 mL min-1 kg-1 and a volume of distribution of 1.3 L kg-1 in human. Efficacy (57% tumor growth inhibition) in Colo-205 CRC tumor xenograft mice was observed at an oral dose of 15 mg/kg BID (AUC = 10.4 µM h). Plasma protein binding was moderately high. GNE-617 was stable to moderately stable in vitro. Main human metabolites identified in human hepatocytes were formed primarily by CYP3A4/5. Transporter studies suggested that GNE-617 is likely a substrate for MDR1 but not for BCRP. Simcyp® simulations suggested a low (CYP2C9 and CYP2C8) or moderate (CYP3A4/5) potential for drug-drug interactions. The potential for autoinhibition was low. Overall, GNE-617 exhibited acceptable preclinical properties and projected human PK and dose estimates.
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Affiliation(s)
- Bianca M Liederer
- a Genentech, Inc., Drug Metabolism and Pharmacokinetics , South San Francisco , CA , USA
| | - Jonathan Cheong
- a Genentech, Inc., Drug Metabolism and Pharmacokinetics , South San Francisco , CA , USA
| | - Kang-Jye Chou
- b Genentech, Inc., Pharmaceutical Sciences , South San Francisco , CA , USA
| | - Peter S Dragovich
- c Genentech, Inc., Medicinal Chemistry , South San Francisco , CA , USA
| | - Hoa Le
- a Genentech, Inc., Drug Metabolism and Pharmacokinetics , South San Francisco , CA , USA
| | - Xiaorong Liang
- a Genentech, Inc., Drug Metabolism and Pharmacokinetics , South San Francisco , CA , USA
| | - Justin Ly
- a Genentech, Inc., Drug Metabolism and Pharmacokinetics , South San Francisco , CA , USA
| | - Sophie Mukadam
- a Genentech, Inc., Drug Metabolism and Pharmacokinetics , South San Francisco , CA , USA
| | - Jason Oeh
- d Genentech, Inc., Translational Oncology , South San Francisco , CA , USA
| | - Deepak Sampath
- d Genentech, Inc., Translational Oncology , South San Francisco , CA , USA
| | - Leslie Wang
- a Genentech, Inc., Drug Metabolism and Pharmacokinetics , South San Francisco , CA , USA
| | - Susan Wong
- a Genentech, Inc., Drug Metabolism and Pharmacokinetics , South San Francisco , CA , USA
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24
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Yaku K, Okabe K, Hikosaka K, Nakagawa T. NAD Metabolism in Cancer Therapeutics. Front Oncol 2018; 8:622. [PMID: 30631755 PMCID: PMC6315198 DOI: 10.3389/fonc.2018.00622] [Citation(s) in RCA: 133] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Accepted: 11/30/2018] [Indexed: 12/15/2022] Open
Abstract
Cancer cells have a unique energy metabolism for sustaining rapid proliferation. The preference for anaerobic glycolysis under normal oxygen conditions is a unique trait of cancer metabolism and is designated as the Warburg effect. Enhanced glycolysis also supports the generation of nucleotides, amino acids, lipids, and folic acid as the building blocks for cancer cell division. Nicotinamide adenine dinucleotide (NAD) is a co-enzyme that mediates redox reactions in a number of metabolic pathways, including glycolysis. Increased NAD levels enhance glycolysis and fuel cancer cells. In fact, nicotinamide phosphoribosyltransferase (Nampt), a rate-limiting enzyme for NAD synthesis in mammalian cells, is frequently amplified in several cancer cells. In addition, Nampt-specific inhibitors significantly deplete NAD levels and subsequently suppress cancer cell proliferation through inhibition of energy production pathways, such as glycolysis, tricarboxylic acid (TCA) cycle, and oxidative phosphorylation. NAD also serves as a substrate for poly(ADP-ribose) polymerase (PARP), sirtuin, and NAD gylycohydrolase (CD38 and CD157); thus, NAD regulates DNA repair, gene expression, and stress response through these enzymes. Thus, NAD metabolism is implicated in cancer pathogenesis beyond energy metabolism and considered a promising therapeutic target for cancer treatment. In this review, we present recent findings with respect to NAD metabolism and cancer pathogenesis. We also discuss the current and future perspectives regarding the therapeutics that target NAD metabolic pathways.
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Affiliation(s)
- Keisuke Yaku
- Department of Metabolism and Nutrition, Graduate School of Medicine and Pharmaceutical Science for Research, University of Toyama, Toyama, Japan
| | - Keisuke Okabe
- Department of Metabolism and Nutrition, Graduate School of Medicine and Pharmaceutical Science for Research, University of Toyama, Toyama, Japan.,First Department of Internal Medicine, Graduate School of Medicine and Pharmaceutical Science for Research, University of Toyama, Toyama, Japan
| | - Keisuke Hikosaka
- Department of Metabolism and Nutrition, Graduate School of Medicine and Pharmaceutical Science for Research, University of Toyama, Toyama, Japan
| | - Takashi Nakagawa
- Department of Metabolism and Nutrition, Graduate School of Medicine and Pharmaceutical Science for Research, University of Toyama, Toyama, Japan.,Institute of Natural Medicine, University of Toyama, Toyama, Japan
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25
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Tripathi SC, Fahrmann JF, Vykoukal JV, Dennison JB, Hanash SM. Targeting metabolic vulnerabilities of cancer: Small molecule inhibitors in clinic. Cancer Rep (Hoboken) 2018; 2:e1131. [PMID: 32721114 DOI: 10.1002/cnr2.1131] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 07/12/2018] [Accepted: 07/13/2018] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Altered cell metabolism is an established hallmark of cancer. Advancement in our understanding of dysregulated cellular metabolism has aided drastically in identifying metabolic vulnerabilities that can be exploited therapeutically. Indeed, this knowledge has led to the development of a multitude of agents targeting various aspects of tumor metabolism. RECENT FINDINGS The intent of this review is to provide insight into small molecule inhibitors that target tumor metabolism and that are currently being explored in active clinical trials as either preventive, stand-alone, or adjuvant therapies for various malignancies. For each inhibitor, we outline the mechanism (s) of action, preclinical/clinical findings, and limitations. Sections are divided into three aspects based on the primary target of the small molecule inhibitor (s): those that impact (1) cancer cells directly, (2) immune cells present in the tumor microenvironment, or (3) both cancer cells and immune cells. We highlight small molecule targeting of metabolic pathways including de novo fatty acid synthesis, NAD+ biosynthesis, 2-hydroxyglutarate biosynthesis, polyamine metabolism, the kynurenine pathway, as well as glutamine and arginine metabolism. CONCLUSIONS Use of small molecule inhibitors aimed at exploiting tumor metabolic vulnerabilities continues to be an active area of research. Identifying metabolic dependencies specific to cancer cells and/or constituents of the tumor microenvironment is a viable area of therapeutic intervention that holds considerable clinical potential.
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Affiliation(s)
- Satyendra C Tripathi
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX, 77030, USA
| | - Johannes F Fahrmann
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX, 77030, USA
| | - Jody V Vykoukal
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX, 77030, USA
| | - Jennifer B Dennison
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX, 77030, USA
| | - Samir M Hanash
- Department of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX, 77030, USA
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26
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Neumann CS, Olivas KC, Anderson ME, Cochran JH, Jin S, Li F, Loftus LV, Meyer DW, Neale J, Nix JC, Pittman PG, Simmons JK, Ulrich ML, Waight AB, Wong A, Zaval MC, Zeng W, Lyon RP, Senter PD. Targeted Delivery of Cytotoxic NAMPT Inhibitors Using Antibody-Drug Conjugates. Mol Cancer Ther 2018; 17:2633-2642. [PMID: 30242091 DOI: 10.1158/1535-7163.mct-18-0643] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 07/24/2018] [Accepted: 09/14/2018] [Indexed: 11/16/2022]
Abstract
Antibody-drug conjugates (ADCs) are a therapeutic modality that enables the targeted delivery of cytotoxic drugs to cancer cells. Identification of active payloads with unique mechanisms of action is a key aim of research efforts in the field. Herein, we report the development of inhibitors of nicotinamide phosphoribosyltransferase (NAMPT) as a novel payload for ADC technology. NAMPT is a component of a salvage biosynthetic pathway for NAD, and inhibition of this enzyme results in disruption of primary cellular metabolism leading to cell death. Through derivatization of the prototypical NAMPT inhibitor FK-866, we identified potent analogues with chemical functionality that enables the synthesis of hydrophilic enzyme-cleavable drug linkers. The resulting ADCs displayed NAD depletion in both cell-based assays and tumor xenografts. Antitumor efficacy is demonstrated in five mouse xenograft models using ADCs directed to indication-specific antigens. In rat toxicology models, a nonbinding control ADC was tolerated at >10-fold the typical efficacious dose used in xenografts. Moderate, reversible hematologic effects were observed with ADCs in rats, but there was no evidence for the retinal and cardiac toxicities reported for small-molecule inhibitors. These findings introduce NAMPT inhibitors as active and well-tolerated payloads for ADCs with promise to improve the therapeutic window of NAMPT inhibition and enable application in clinical settings.
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Affiliation(s)
| | | | | | | | - Steven Jin
- Seattle Genetics, Inc., Bothell, Washington
| | - Fu Li
- Seattle Genetics, Inc., Bothell, Washington
| | | | | | | | - Jay C Nix
- Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California
| | | | | | | | | | - Abbie Wong
- Seattle Genetics, Inc., Bothell, Washington
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27
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Lee J, Kim H, Lee JE, Shin SJ, Oh S, Kwon G, Kim H, Choi YY, White MA, Paik S, Cheong JH, Kim HS. Selective Cytotoxicity of the NAMPT Inhibitor FK866 Toward Gastric Cancer Cells With Markers of the Epithelial-Mesenchymal Transition, Due to Loss of NAPRT. Gastroenterology 2018; 155:799-814.e13. [PMID: 29775598 DOI: 10.1053/j.gastro.2018.05.024] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 05/03/2018] [Accepted: 05/09/2018] [Indexed: 01/06/2023]
Abstract
BACKGROUND & AIMS Markers of the epithelial-to-mesenchymal transition (EMT) in gastric tumor tissues are associated with poor patient outcomes. We performed a screen to identify pharmacologic compounds that kill gastric cancer cells with EMT-associated gene expression patterns and investigate their mechanisms. METHODS We identified 29 gastric cancer cell lines with a gene expression signature previously associated with an EMT subtype, based on data from RNA sequence analyses, and confirmed the mesenchymal phenotypes of 7 lines (Hs746T, SNU1750, MKN1, SK4, SNU484, SNU668, and YCC11), based on invasive activity and protein markers. We screened 1,345 compounds for their ability to kill cells with the EMT signature compared with cell lines without this pattern. We tested the effects of identified compounds in BALB/c nude mice bearing GA077 tumors; mice were given intraperitoneal injections of the compound or vehicle (control) twice daily for 24 days and tumor growth was monitored. Proteins associated with the toxicity of the compounds were overexpressed in MKN1 and SNU484 cells or knocked down in MKN45 and SNU719 using small interfering RNAs. We performed immunohistochemical analyses of 942 gastric cancer tissues and investigated associations between EMT markers and protein expression patterns. RESULTS The nicotinamide phosphoribosyltransferase inhibitor FK866 killed 6 of 7 gastric cancer cell lines with EMT-associated gene expression signatures but not gastric cancer cells without this signature. The 6 EMT-subtype gastric cell lines expressed significantly low levels of nicotinic acid phosphoribosyltransferase (NAPRT), which makes the cells hypersensitive to nicotinamide phosphoribosyltransferase inhibition. Gastric cell lines that expressed higher levels of NAPRT, regardless of EMT markers, were sensitized to FK866 after knockdown of NAPRT, whereas overexpression of NAPRT in deficient EMT cell lines protected them from FK866-mediated toxicity. Administration of FK866 to nude mice with tumors grown from GA077 cells (human gastric cancer tumors of the EMT subtype) led to tumor regression in 2 weeks; FK866 did not affect tumors grown from MKN45 cells without the EMT expression signature. Loss of NAPRT might promote the EMT, because it stabilizes β-catenin. We correlated the EMT gene expression signature with lower levels of NAPRT in 942 gastric tumors from patients; we also found lower levels of NAPRT mRNA in colorectal, pancreatic, and lung adenocarcinoma tissues with the EMT gene expression signature. CONCLUSIONS FK866 selectively kills gastric cancer cells with an EMT gene expression signature by inhibiting nicotinamide phosphoribosyltransferase in cells with NAPRT deficiency. Loss of NAPRT expression, frequently through promoter hypermethylation, is observed in many gastric tumors of the EMT subtype. FK866 might be used to treat patients with tumors of this subtype.
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Affiliation(s)
- Jooyoung Lee
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Hyosil Kim
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Jae Eun Lee
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea; Department of Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Su-Jin Shin
- Department of Pathology, Hanyang University College of Medicine, Seoul, Korea
| | - Sejin Oh
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea; Brain Korea 21 Plus Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Gino Kwon
- Graduate Program for Nanomedical Science, Yonsei University, Seoul, Korea
| | - Hakhyun Kim
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea; Brain Korea 21 Plus Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Yoon Young Choi
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea; Department of Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Michael A White
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Soonmyung Paik
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Jae-Ho Cheong
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea; Department of Surgery, Yonsei University College of Medicine, Seoul, Korea; Brain Korea 21 Plus Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.
| | - Hyun Seok Kim
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea; Brain Korea 21 Plus Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.
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28
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Kong J, Du C, Jiang L, Jiang W, Deng P, Shao X, Zhang B, Li Y, Zhu R, Zhao Q, Fu D, Gu H, Luo L, Long H, Zhao Y, Cen X. Nicotinamide phosphoribosyltransferase regulates cocaine reward through Sirtuin 1. Exp Neurol 2018; 307:52-61. [DOI: 10.1016/j.expneurol.2018.05.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2017] [Revised: 05/05/2018] [Accepted: 05/09/2018] [Indexed: 12/21/2022]
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29
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Targeting glucose transport and the NAD pathway in tumor cells with STF-31: a re-evaluation. Cell Oncol (Dordr) 2018; 41:485-494. [PMID: 29949049 DOI: 10.1007/s13402-018-0385-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2018] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Targeting glucose metabolism is a promising way to interfere with tumor cell proliferation and survival. However, controversy exists about the specificity of some glucose metabolism targeting anticancer drugs. Especially the potency of STF-31 has been debated. Here, we aimed to assess the impact of the glucose transporter (GLUT) inhibitors fasentin and WZB117, and the nicotinamide phosphoribosyltransferase (NAMPT) inhibitors GMX1778 and STF-31 on tumor cell proliferation and survival, as well as on glucose uptake. METHODS Tumor-derived A172 (glioblastoma), BHY (oral squamous cell carcinoma), HeLa (cervix adenocarcinoma), HN (head neck cancer), HT-29 (colon carcinoma) and MG-63 (osteosarcoma) cells were treated with fasentin, WZB117, GMX1778 and STF-31. Proliferation rates and cell viabilities were assessed using XTT, crystal violet and LDH assays. mRNA and protein expression of GLUT1 and NAPRT were assessed using qPCR and Western blotting, respectively. The effects of inhibiting compounds on glucose uptake were measured using [18F]-fluoro-deoxyglucose uptake experiments. RESULTS Stimulation of tumor-derived cells with the different inhibitors tested revealed a complex pattern, whereby proliferation inhibiting and survival reducing concentrations varied in [18F]-fluoro-deoxyglucose uptake experiments more than one order of magnitude among the different cells tested. We found that the effects of GMX1778 and STF-31 could be partially abolished by (i) nicotinic acid (NA) only in nicotinic acid phosphoribosyltransferase (NAPRT) expressing cells and (ii) nicotinamide mononucleotide (NMN) in all cells tested, supporting the classification of these compounds as NAMPT inhibitors. In short-time [18F]-fluoro-deoxyglucose uptake experiments the application of WZB-117 was found to lead to an almost complete uptake inhibition in all cells tested, whereas the effect of fasentin was found to be cell type dependent with a maximum value of ~35% in A172, BHY, HeLa and HT-29 cells. We also found that STF-31 inhibited glucose uptake in all cells tested in a range of 25-50%. These data support the classification of STF-31 as a GLUT inhibitor. CONCLUSIONS Our data reveal a dual mode of action of STF-31, serving either as a NAMPT or as a GLUT inhibitor, whereby the latter seems to be apparent only at higher STF-31 concentrations. The molecular basis of such a dual function and its appearance in compounds previously designated as NAMPT-specific inhibitors requires further investigation.
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30
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Hosein AN, Beg MS. Pancreatic Cancer Metabolism: Molecular Mechanisms and Clinical Applications. Curr Oncol Rep 2018; 20:56. [PMID: 29752600 DOI: 10.1007/s11912-018-0699-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
PURPOSE OF REVIEW Pancreatic adenocarcinoma is a leading cause of cancer mortality in western countries with a uniformly poor prognosis. Unfortunately, there has been little in the way of novel therapeutics for this malignancy over the last several decades. Derangements in metabolic circuitry favoring excess glycolysis are increasingly recognized as a key hallmark of cancer. RECENT FINDINGS The role of alterations in glutamine metabolism in pancreatic tumor progression has been elucidated in animal models and human cells lines, and there has been considerable interest in exploiting these aberrations for the treatment of pancreatic cancer. Other strategies targeting NQO1/GLS1 inhibition, NAD+ synthesis, and TCA cycle intermediates are being actively studied in the clinic. Aberrant metabolism in pancreatic cancer poses a unique therapeutic strategy. We review preclinical and clinical studies looking to exploit alterations in the metabolic circuitry of pancreatic cancer.
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Affiliation(s)
- Abdel Nasser Hosein
- Department of Internal Medicine, Division of Hematology and Oncology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Muhammad Shaalan Beg
- Department of Internal Medicine, Division of Hematology and Oncology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
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31
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Misner DL, Kauss MA, Singh J, Uppal H, Bruening-Wright A, Liederer BM, Lin T, McCray B, La N, Nguyen T, Sampath D, Dragovich PS, O'Brien T, Zabka TS. Cardiotoxicity Associated with Nicotinamide Phosphoribosyltransferase Inhibitors in Rodents and in Rat and Human-Derived Cells Lines. Cardiovasc Toxicol 2018; 17:307-318. [PMID: 27783203 DOI: 10.1007/s12012-016-9387-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) is a pleiotropic protein that functions as an enzyme, cytokine, growth factor and hormone. As a target for oncology, NAMPT is particularly attractive, because it catalyzes the rate-limiting step in the salvage pathway to generate nicotinamide adenine dinucleotide (NAD), a universal energy- and signal-carrying molecule involved in cellular energy metabolism and many homeostatic functions. Inhibition of NAMPT generally results in NAD depletion, followed by ATP reduction and loss of cell viability. Herein, we describe NAMPT inhibitor (NAMPTi)-induced cardiac toxicity in rodents following short-term administration (2-7 days) of NAMPTi's. The cardiac toxicity was interpreted as a functional effect leading to congestive heart failure, characterized by sudden death, thoracic and abdominal effusion, and myocardial degeneration. Based on exposures in the initial in vivo safety rodent studies and cardiotoxicity observed, we conducted studies in rat and human in vitro cardiomyocyte cell systems. Based on those results, combined with human cell line potency data, we demonstrated the toxicity is both on-target and likely human relevant. This toxicity was mitigated in vitro by co-administration of nicotinic acid (NA), which can enable NAD production through the NAMPT-independent pathway; however, this resulted in only partial mitigation in in vivo studies. This work also highlights the usefulness and predictivity of in vitro cardiomyocyte assays using human cells to rank-order compounds against potency in cell-based pharmacology assays. Lastly, this work strengthens the correlation between cardiomyocyte cell viability and functionality, suggesting that these assays together may enable early assessment of cardiotoxicity in vitro prior to conduct of in vivo studies and potentially reduce subsequent attrition due to cardiotoxicity.
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Affiliation(s)
- D L Misner
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA.
| | - M A Kauss
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - J Singh
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - H Uppal
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | | | - B M Liederer
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - T Lin
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - B McCray
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - N La
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - T Nguyen
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - D Sampath
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - P S Dragovich
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - T O'Brien
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
| | - T S Zabka
- Genentech, 1 DNA Way, M/S 59, South San Francisco, CA, 94080, USA
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Zhao G, Green CF, Hui YH, Prieto L, Shepard R, Dong S, Wang T, Tan B, Gong X, Kays L, Johnson RL, Wu W, Bhattachar S, Del Prado M, Gillig JR, Fernandez MC, Roth KD, Buchanan S, Kuo MS, Geeganage S, Burkholder TP. Discovery of a Highly Selective NAMPT Inhibitor That Demonstrates Robust Efficacy and Improved Retinal Toxicity with Nicotinic Acid Coadministration. Mol Cancer Ther 2017; 16:2677-2688. [PMID: 29054982 DOI: 10.1158/1535-7163.mct-16-0674] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 04/13/2017] [Accepted: 09/21/2017] [Indexed: 11/16/2022]
Abstract
NAMPT, an enzyme essential for NAD+ biosynthesis, has been extensively studied as an anticancer target for developing potential novel therapeutics. Several NAMPT inhibitors have been discovered, some of which have been subjected to clinical investigations. Yet, the on-target hematological and retinal toxicities have hampered their clinical development. In this study, we report the discovery of a unique NAMPT inhibitor, LSN3154567. This molecule is highly selective and has a potent and broad spectrum of anticancer activity. Its inhibitory activity can be rescued with nicotinic acid (NA) against the cell lines proficient, but not those deficient in NAPRT1, essential for converting NA to NAD+ LSN3154567 also exhibits robust efficacy in multiple tumor models deficient in NAPRT1. Importantly, this molecule when coadministered with NA does not cause observable retinal and hematological toxicities in the rodents, yet still retains robust efficacy. Thus, LSN3154567 has the potential to be further developed clinically into a novel cancer therapeutic. Mol Cancer Ther; 16(12); 2677-88. ©2017 AACR.
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Affiliation(s)
- Genshi Zhao
- Cancer Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
| | - Colin F Green
- Toxicology, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Yu-Hua Hui
- Drug Disposition, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Lourdes Prieto
- Discovery Chemistry Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Robert Shepard
- Cancer Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Sucai Dong
- Cancer Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Tao Wang
- Cancer Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Bo Tan
- Toxicology, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Xueqian Gong
- Cancer Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Lisa Kays
- Cancer Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Robert L Johnson
- Toxicology, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Wenjuan Wu
- Cancer Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Shobha Bhattachar
- Product Design and Developability, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Miriam Del Prado
- Discovery Chemistry Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - James R Gillig
- Discovery Chemistry Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Maria-Carmen Fernandez
- Discovery Chemistry Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Ken D Roth
- Discovery Chemistry Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Sean Buchanan
- Cancer Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Ming-Shang Kuo
- Discovery Chemistry Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Sandaruwan Geeganage
- Cancer Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Timothy P Burkholder
- Discovery Chemistry Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
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Novel NAPRT specific antibody identifies small cell lung cancer and neuronal cancers as promising clinical indications for a NAMPT inhibitor/niacin co-administration strategy. Oncotarget 2017; 8:77846-77859. [PMID: 29100430 PMCID: PMC5652819 DOI: 10.18632/oncotarget.20840] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 08/17/2017] [Indexed: 12/17/2022] Open
Abstract
Tumor cells are particularly dependent on NAD+ due to higher rates of metabolism, DNA synthesis and repair. Nicotinamide phosphoribosyltransferase inhibitors (NAMPTis) inhibit NAD+ biosynthesis and represent promising new anti-cancer agents. However, clinical efficacy has been limited by toxicities demonstrating the need for drug combinations to broaden the therapeutic index. One potential combination involves niacin/NAMPTi co-administration. Niacin can rescue NAD+ biosynthesis through a parallel pathway that depends on nicotinic acid phosphoribosyltransferase (NAPRT) expression. Most normal tissues express NAPRT while a significant proportion of malignant cells do not, providing a possible selection marker for patients to achieve NAMPTi efficacy while minimizing toxicities. Here we identify and validate a novel highly NAPRT-specific monoclonal antibody (3C6D2) that detects functional NAPRT in paraffin embedded tissue sections by immunohistochemistry (IHC). NAPRT detection by 3C6D2 coincides with the ability of niacin to rescue cells from NAMPTi induced cytotoxicity in cell lines and animal xenograft models. 3C6D2 binds to an epitope that is unique to NAPRT among phosphoribosyltransferases. In a series of primary tumor samples from lung and brain cancer patients, we demonstrate that >70 % of human small cell lung carcinomas, glioblastomas and oligodendrogliomas lack NAPRT identifying them as potentially suitable indications for the NAMPT/niacin combination.
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Piacente F, Caffa I, Ravera S, Sociali G, Passalacqua M, Vellone VG, Becherini P, Reverberi D, Monacelli F, Ballestrero A, Odetti P, Cagnetta A, Cea M, Nahimana A, Duchosal M, Bruzzone S, Nencioni A. Nicotinic Acid Phosphoribosyltransferase Regulates Cancer Cell Metabolism, Susceptibility to NAMPT Inhibitors, and DNA Repair. Cancer Res 2017; 77:3857-3869. [PMID: 28507103 DOI: 10.1158/0008-5472.can-16-3079] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 04/06/2017] [Accepted: 05/12/2017] [Indexed: 11/16/2022]
Abstract
In the last decade, substantial efforts have been made to identify NAD+ biosynthesis inhibitors, specifically against nicotinamide phosphoribosyltransferase (NAMPT), as preclinical studies indicate their potential efficacy as cancer drugs. However, the clinical activity of NAMPT inhibitors has proven limited, suggesting that alternative NAD+ production routes exploited by tumors confer resistance. Here, we show the gene encoding nicotinic acid phosphoribosyltransferase (NAPRT), a second NAD+-producing enzyme, is amplified and overexpressed in a subset of common types of cancer, including ovarian cancer, where NAPRT expression correlates with a BRCAness gene expression signature. Both NAPRT and NAMPT increased intracellular NAD+ levels. NAPRT silencing reduced energy status, protein synthesis, and cell size in ovarian and pancreatic cancer cells. NAPRT silencing sensitized cells to NAMPT inhibitors both in vitro and in vivo; similar results were obtained with the NAPRT inhibitor 2-hydroxynicotinic acid. Reducing NAPRT levels in a BRCA2-deficient cancer cell line exacerbated DNA damage in response to chemotherapeutics. In conclusion, NAPRT-dependent NAD+ biosynthesis contributes to cell metabolism and to the DNA repair process in a subset of tumors. This knowledge could be used to increase the efficacy of NAMPT inhibitors and chemotherapy. Cancer Res; 77(14); 3857-69. ©2017 AACR.
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Affiliation(s)
- Francesco Piacente
- Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa, Italy
| | - Irene Caffa
- Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa, Italy
| | - Silvia Ravera
- Department of Pharmacy, Biochemistry Lab, Genoa, Italy
| | - Giovanna Sociali
- Department of Experimental Medicine, University of Genoa, Genoa, Italy
| | - Mario Passalacqua
- Department of Experimental Medicine, University of Genoa, Genoa, Italy
| | - Valerio G Vellone
- Department of Integrated, Surgical and Diagnostic Sciences, University of Genoa, Genoa, Italy.,Ospedale Policlinico San Martino, I.R.C.C.S. per l'Oncologia, Genoa, Italy
| | - Pamela Becherini
- Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa, Italy
| | - Daniele Reverberi
- Ospedale Policlinico San Martino, I.R.C.C.S. per l'Oncologia, Genoa, Italy
| | - Fiammetta Monacelli
- Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa, Italy
| | - Alberto Ballestrero
- Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa, Italy.,Ospedale Policlinico San Martino, I.R.C.C.S. per l'Oncologia, Genoa, Italy
| | - Patrizio Odetti
- Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa, Italy.,Ospedale Policlinico San Martino, I.R.C.C.S. per l'Oncologia, Genoa, Italy
| | - Antonia Cagnetta
- Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa, Italy.,Ospedale Policlinico San Martino, I.R.C.C.S. per l'Oncologia, Genoa, Italy
| | - Michele Cea
- Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa, Italy.,Ospedale Policlinico San Martino, I.R.C.C.S. per l'Oncologia, Genoa, Italy
| | - Aimable Nahimana
- Service and Central Laboratory of Hematology, University Hospital of Lausanne, Lausanne, Switzerland
| | - Michel Duchosal
- Service and Central Laboratory of Hematology, University Hospital of Lausanne, Lausanne, Switzerland
| | - Santina Bruzzone
- Department of Experimental Medicine, University of Genoa, Genoa, Italy
| | - Alessio Nencioni
- Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa, Italy. .,Ospedale Policlinico San Martino, I.R.C.C.S. per l'Oncologia, Genoa, Italy
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35
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Fahrmann JF, Grapov DD, Wanichthanarak K, DeFelice BC, Salemi MR, Rom WN, Gandara DR, Phinney BS, Fiehn O, Pass H, Miyamoto S. Integrated Metabolomics and Proteomics Highlight Altered Nicotinamide- and Polyamine Pathways in Lung Adenocarcinoma. Carcinogenesis 2017; 38:271-280. [PMID: 28049629 PMCID: PMC5862279 DOI: 10.1093/carcin/bgw205] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 12/02/2016] [Accepted: 12/20/2016] [Indexed: 01/11/2023] Open
Abstract
Lung cancer is the leading cause of cancer mortality in the United States with non-small cell lung cancer (NSCLC) adenocarcinoma being the most common histological type. Early perturbations in cellular metabolism are a hallmark of cancer, but the extent of these changes in early stage lung adenocarcinoma remains largely unknown. In the current study, an integrated metabolomics and proteomics approach was utilized to characterize the biochemical and molecular alterations between malignant and matched control tissue from 27 subjects diagnosed with early stage lung adenocarcinoma. Differential analysis identified 71 metabolites and 1102 proteins that delineated tumor from control tissue. Integrated results indicated four major metabolic changes in early stage adenocarcinoma: (1) increased glycosylation and glutaminolysis; (2) elevated Nrf2 activation; (3) increase in nicotinic and nicotinamide salvaging pathways; and (4) elevated polyamine biosynthesis linked to differential regulation of the SAM/nicotinamide methyl-donor pathway. Genomic data from publicly available databases were included to strengthen proteomic findings. Our findings provide insight into the biochemical and molecular biological reprogramming that may accompanies early stage lung tumorigenesis and highlight potential therapeutic targets.
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Affiliation(s)
- Johannes F Fahrmann
- University of California, Davis, West Coast Metabolomics Center, Davis, California
| | | | | | - Brian C DeFelice
- University of California, Davis, West Coast Metabolomics Center, Davis, California
| | | | - William N Rom
- Division of Pulmonary, Critical Care, and Sleep, NYU School of Medicine, New York, NY, USA
| | - David R Gandara
- Division of Hematology and Oncology, Department of Internal Medicine, School of Medicine, University of California, Davis Medical Center, Sacramento, California
| | | | - Oliver Fiehn
- University of California, Davis, West Coast Metabolomics Center, Davis, California
- Department of Biochemistry, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi-Arabia
| | - Harvey Pass
- Division of Thoracic Surgery, Department of Cardiothoracic Surgery, Langone Medical Center, New York University, New York, NY, USA
| | - Suzanne Miyamoto
- Division of Hematology and Oncology, Department of Internal Medicine, School of Medicine, University of California, Davis Medical Center, Sacramento, California
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36
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Sociali G, Raffaghello L, Magnone M, Zamporlini F, Emionite L, Sturla L, Bianchi G, Vigliarolo T, Nahimana A, Nencioni A, Raffaelli N, Bruzzone S. Antitumor effect of combined NAMPT and CD73 inhibition in an ovarian cancer model. Oncotarget 2016; 7:2968-84. [PMID: 26658104 PMCID: PMC4823084 DOI: 10.18632/oncotarget.6502] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/16/2015] [Indexed: 12/02/2022] Open
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) is a crucial enzyme in the biosynthesis of intracellular NAD+. NAMPT inhibitors have potent anticancer activity in several preclinical models by depleting NAD+ and ATP levels. Recently, we demonstrated that CD73 enables the utilization of extracellular NAD+/nicotinamide mononucleotide (NMN) by converting them to Nicotinamide riboside (NR), which can cross the plasmamembrane and fuel intracellular NAD+ biosynthesis in human cells. These processes are herein confirmed to also occur in a human ovarian carcinoma cell line (OVCAR-3), by means of CD73 or NRK1 specific silencing. Next, we investigated the anti-tumor activity of the simultaneous inhibition of NAMPT (with FK866) and CD73 (with α, β-methylene adenosine 5′-diphosphate, APCP), in an in vivo human ovarian carcinoma model. Interestingly, the combined therapy was found to significantly decrease intratumor NAD+, NMN and ATP levels, compared with single treatments. In addition, the concentration of these nucleotides in ascitic exudates was more remarkably reduced in animals treated with both FK866 and APCP compared with single treatments. Importantly, tumors treated with FK866 in combination with APCP contained a statistically significant lower proportion of Ki67 positive proliferating cells and a higher percentage of necrotic area. Finally, a slight but significant increase in animal survival in response to the combined therapy, compared to the single agents, could be demonstrated. Our results indicate that the pharmacological inhibition of CD73 enzymatic activity could be considered as a means to potentiate the anti-cancer effects of NAMPT inhibitors.
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Affiliation(s)
- Giovanna Sociali
- Department of Experimental Medicine, Section of Biochemistry, and CEBR, University of Genova, 16132 Genova, Italy
| | | | - Mirko Magnone
- Department of Experimental Medicine, Section of Biochemistry, and CEBR, University of Genova, 16132 Genova, Italy
| | - Federica Zamporlini
- Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy
| | - Laura Emionite
- Animal Facility, IRCCS AOU San Martino - IST Istituto Nazionale per la Ricerca sul Cancro, 16132 Genova, Italy
| | - Laura Sturla
- Department of Experimental Medicine, Section of Biochemistry, and CEBR, University of Genova, 16132 Genova, Italy
| | - Giovanna Bianchi
- Laboratorio di Oncologia Istituto G. Gaslini, 16147 Genova, Italy
| | - Tiziana Vigliarolo
- Department of Experimental Medicine, Section of Biochemistry, and CEBR, University of Genova, 16132 Genova, Italy
| | - Aimable Nahimana
- Service and Central Laboratory of Hematology, University Hospital of Lausanne, 1011-CHUV, Lausanne, Switzerland
| | - Alessio Nencioni
- Department of Internal Medicine, University of Genova, 16132 Genova, Italy.,IRCCS A.O.U. San Martino IST, Istituto Nazionale per la Ricerca sul Cancro, 16132 Genova, Italy
| | - Nadia Raffaelli
- Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy
| | - Santina Bruzzone
- Department of Experimental Medicine, Section of Biochemistry, and CEBR, University of Genova, 16132 Genova, Italy
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37
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Kennedy BE, Sharif T, Martell E, Dai C, Kim Y, Lee PWK, Gujar SA. NAD + salvage pathway in cancer metabolism and therapy. Pharmacol Res 2016; 114:274-283. [PMID: 27816507 DOI: 10.1016/j.phrs.2016.10.027] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 10/30/2016] [Indexed: 12/22/2022]
Abstract
Nicotinamide adenine dinucleotide (NAD+) is an essential coenzyme for various physiological processes including energy metabolism, DNA repair, cell growth, and cell death. Many of these pathways are typically dysregulated in cancer cells, making NAD+ an intriguing target for cancer therapeutics. NAD+ is mainly synthesized by the NAD+ salvage pathway in cancer cells, and not surprisingly, the pharmacological targeting of the NAD+ salvage pathway causes cancer cell cytotoxicity in vitro and in vivo. Several studies have described the precise consequences of NAD+ depletion on cancer biology, and have demonstrated that NAD+ depletion results in depletion of energy levels through lowered rates of glycolysis, reduced citric acid cycle activity, and decreased oxidative phosphorylation. Additionally, depletion of NAD+ causes sensitization of cancer cells to oxidative damage by disruption of the anti-oxidant defense system, decreased cell proliferation, and initiation of cell death through manipulation of cell signaling pathways (e.g., SIRT1 and p53). Recently, studies have explored the effect of well-known cancer therapeutics in combination with pharmacological depletion of NAD+ levels, and found in many cases a synergistic effect on cancer cell cytotoxicity. In this context, we will discuss the effects of NAD+ salvage pathway inhibition on cancer cell biology and provide insight on this pathway as a novel anti-cancer therapeutic target.
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Affiliation(s)
- Barry E Kennedy
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS, Canada
| | - Tanveer Sharif
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS, Canada
| | - Emma Martell
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS, Canada
| | - Cathleen Dai
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS, Canada
| | - Youra Kim
- Department of Pathology, Dalhousie University, Halifax, NS, Canada
| | - Patrick W K Lee
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS, Canada; Department of Pathology, Dalhousie University, Halifax, NS, Canada
| | - Shashi A Gujar
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS, Canada; Department of Pathology, Dalhousie University, Halifax, NS, Canada; Centre for Innovative and Collaborative Health Systems Research, IWK Health Centre, Halifax, NS, Canada.
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38
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Duarte-Pereira S, Pereira-Castro I, Silva SS, Correia MG, Neto C, da Costa LT, Amorim A, Silva RM. Extensive regulation of nicotinate phosphoribosyltransferase (NAPRT) expression in human tissues and tumors. Oncotarget 2016; 7:1973-83. [PMID: 26675378 PMCID: PMC4811510 DOI: 10.18632/oncotarget.6538] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 11/21/2015] [Indexed: 12/20/2022] Open
Abstract
Nicotinamide adenine dinucleotide (NAD) is a cofactor in redox reactions and a substrate for NAD-consuming enzymes, such as PARPs and sirtuins. As cancer cells have increased NAD requirements, the main NAD salvage enzymes in humans, nicotinamide phosphoribosyltransferase (NAMPT) and nicotinate phosphoribosyltransferase (NAPRT), are involved in the development of novel anti-cancer therapies. Knowledge of the expression patterns of both genes in tissues and tumors is critical for the use of nicotinic acid (NA) as cytoprotective in therapies using NAMPT inhibitors. Herein, we provide a comprehensive study of NAPRT and NAMPT expression across human tissues and tumor cell lines. We show that both genes are widely expressed under normal conditions and describe the occurrence of novel NAPRT transcripts. Also, we explore some of the NAPRT gene expression mechanisms. Our findings underline that the efficiency of NA in treatments with NAMPT inhibitors is dependent on the knowledge of the expression profiles and regulation of both NAMPT and NAPRT.
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Affiliation(s)
- Sara Duarte-Pereira
- IPATIMUP - Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - Isabel Pereira-Castro
- IPATIMUP - Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
- Gene Regulation Group, i3S/IBMC - Instituto de Investigação e Inovação em Saúde/Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal
| | - Sarah S. Silva
- IPATIMUP - Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - Mariana Gonçalves Correia
- IPATIMUP - Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - Célia Neto
- IPATIMUP - Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - Luís Teixeira da Costa
- IPATIMUP - Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
- ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, University of Évora, Évora, Portugal
| | - António Amorim
- IPATIMUP - Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
- Faculty of Sciences, University of Porto, Porto, Portugal
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
| | - Raquel M. Silva
- IPATIMUP - Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
- Institute for Biomedicine - iBiMED & IEETA, University of Aveiro, Aveiro, Portugal
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39
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Sampath D, Zabka TS, Misner DL, O’Brien T, Dragovich PS. Inhibition of nicotinamide phosphoribosyltransferase (NAMPT) as a therapeutic strategy in cancer. Pharmacol Ther 2015; 151:16-31. [DOI: 10.1016/j.pharmthera.2015.02.004] [Citation(s) in RCA: 162] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 02/02/2015] [Indexed: 12/12/2022]
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40
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Roulston A, Shore GC. New strategies to maximize therapeutic opportunities for NAMPT inhibitors in oncology. Mol Cell Oncol 2015; 3:e1052180. [PMID: 27308565 PMCID: PMC4845202 DOI: 10.1080/23723556.2015.1052180] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 05/13/2015] [Indexed: 12/16/2022]
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) is crucial for nicotinamide adenine dinucleotide (NAD(+)) biosynthesis in mammalian cells. NAMPT inhibitors represent multifunctional anticancer agents that act on NAD(+) metabolism to shut down glycolysis, nucleotide biosynthesis, and ATP generation and act indirectly as PARP and sirtuin inhibitors. The selectivity of NAMPT inhibitors preys on the increased metabolic requirements to replenish NAD(+) in cancer cells. Although initial clinical studies with NAMPT inhibitors did not achieve single-agent therapeutic levels before dose-limiting toxicities were reached, a new understanding of alternative rescue pathways and a biomarker that can be used to select patients provides new opportunities to widen the therapeutic window and achieve efficacious doses in the clinic. Recent work has also illustrated the potential for drug combination strategies to further enhance the therapeutic opportunities. This review summarizes recent discoveries in NAD(+)/NAMPT inhibitor biology in the context of exploiting this new knowledge to optimize the clinical outcomes for this promising new class of agents.
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Affiliation(s)
- Anne Roulston
- Laboratory for Therapeutic Development, Rosalind and Morris Goodman Cancer Research Centre, and Dept. Biochemistry, McGill University , Montreal, QC, Canada
| | - Gordon C Shore
- Laboratory for Therapeutic Development, Rosalind and Morris Goodman Cancer Research Centre, and Dept. Biochemistry, McGill University , Montreal, QC, Canada
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41
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Moore Z, Chakrabarti G, Luo X, Ali A, Hu Z, Fattah FJ, Vemireddy R, DeBerardinis RJ, Brekken RA, Boothman DA. NAMPT inhibition sensitizes pancreatic adenocarcinoma cells to tumor-selective, PAR-independent metabolic catastrophe and cell death induced by β-lapachone. Cell Death Dis 2015; 6:e1599. [PMID: 25590809 PMCID: PMC4669762 DOI: 10.1038/cddis.2014.564] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 11/26/2014] [Accepted: 11/28/2014] [Indexed: 01/01/2023]
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) inhibitors (e.g., FK866) target the most active pathway of NAD(+) synthesis in tumor cells, but lack tumor-selectivity for use as a single agent. Reducing NAD(+) pools by inhibiting NAMPT primed pancreatic ductal adenocarcinoma (PDA) cells for poly(ADP ribose) polymerase (PARP1)-dependent cell death induced by the targeted cancer therapeutic, β-lapachone (β-lap, ARQ761), independent of poly(ADP ribose) (PAR) accumulation. β-Lap is bioactivated by NADPH:quinone oxidoreductase 1 (NQO1) in a futile redox cycle that consumes oxygen and generates high levels of reactive oxygen species (ROS) that cause extensive DNA damage and rapid PARP1-mediated NAD(+) consumption. Synergy with FK866+β-lap was tumor-selective, only occurring in NQO1-overexpressing cancer cells, which is noted in a majority (∼85%) of PDA cases. This treatment strategy simultaneously decreases NAD(+) synthesis while increasing NAD(+) consumption, reducing required doses and treatment times for both drugs and increasing potency. These complementary mechanisms caused profound NAD(P)(+) depletion and inhibited glycolysis, driving down adenosine triphosphate levels and preventing recovery normally observed with either agent alone. Cancer cells died through an ROS-induced, μ-calpain-mediated programmed cell death process that kills independent of caspase activation and is not driven by PAR accumulation, which we call NAD(+)-Keresis. Non-overlapping specificities of FK866 for PDA tumors that rely heavily on NAMPT-catalyzed NAD(+) synthesis and β-lap for cancer cells with elevated NQO1 levels affords high tumor-selectivity. The concept of reducing NAD(+) pools in cancer cells to sensitize them to ROS-mediated cell death by β-lap is a novel strategy with potential application for pancreatic and other types of NQO1+ solid tumors.
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Affiliation(s)
- Z Moore
- Pharmacology and Radiation Oncology, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - G Chakrabarti
- Pharmacology and Radiation Oncology, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - X Luo
- Pharmacology and Radiation Oncology, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - A Ali
- Internal Medicine and Touchstone Diabetes Center, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Z Hu
- Children's Medical Center Research Institute, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - F J Fattah
- Pharmacology and Radiation Oncology, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - R Vemireddy
- Pharmacology and Radiation Oncology, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - R J DeBerardinis
- Children's Medical Center Research Institute, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - R A Brekken
- Pharmacology and Radiation Oncology, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
- Surgical Oncology, Department of Surgery and Hamon Center for Therapeutic Oncology Research, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - D A Boothman
- Pharmacology and Radiation Oncology, Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA
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42
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Zabka TS, Singh J, Dhawan P, Liederer BM, Oeh J, Kauss MA, Xiao Y, Zak M, Lin T, McCray B, La N, Nguyen T, Beyer J, Farman C, Uppal H, Dragovich PS, O'Brien T, Sampath D, Misner DL. Retinal toxicity, in vivo and in vitro, associated with inhibition of nicotinamide phosphoribosyltransferase. Toxicol Sci 2014; 144:163-72. [PMID: 25505128 DOI: 10.1093/toxsci/kfu268] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Nicotinamide phosphoribosyltransferase (NAMPT) is a pleiotropic protein with intra- and extra-cellular functions as an enzyme, cytokine, growth factor, and hormone. NAMPT is of interest for oncology, because it catalyzes the rate-limiting step in the salvage pathway to generate nicotinamide adenine dinucleotide (NAD), which is considered a universal energy- and signal-carrying molecule involved in cellular energy metabolism and many homeostatic functions. This manuscript describes NAMPT inhibitor-induced retinal toxicity that was identified in rodent safety studies. This toxicity had a rapid onset and progression and initially targeted the photoreceptor and outer nuclear layers. Using in vivo safety and efficacy rodent studies, human and mouse cell line potency data, human and rat retinal pigmented epithelial cell in vitro systems, and rat mRNA expression data of NAMPT, nicotinic acid phosphoribosyltransferase, and nicotinamide mononucleotide adenylyltransferease (NMNAT) in several tissues from rat including retina, we demonstrate that the retinal toxicity is on-target and likely human relevant. We demonstrate that this toxicity is not mitigated by coadministration of nicotinic acid (NA), which can enable NAD production through the NAMPT-independent pathway. Further, modifying the physiochemical properties of NAMPT inhibitors could not sufficiently reduce retinal exposure. Our work highlights opportunities to leverage appropriately designed efficacy studies to identify known and measurable safety findings to screen compounds more rapidly and reduce animal use. It also demonstrates that in vitro systems with the appropriate cell composition and relevant biology and toxicity endpoints can provide tools to investigate mechanism of toxicity and the human translation of nonclinical safety concerns.
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Affiliation(s)
- Tanja S Zabka
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Jatinder Singh
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Preeti Dhawan
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Bianca M Liederer
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Jason Oeh
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Mara A Kauss
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Yang Xiao
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Mark Zak
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Tori Lin
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Bobbi McCray
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Nghi La
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Trung Nguyen
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Joseph Beyer
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Cynthia Farman
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Hirdesh Uppal
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Peter S Dragovich
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Thomas O'Brien
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Deepak Sampath
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
| | - Dinah L Misner
- *Safety Assessment, Genentech, South San Francisco, California 94080, DMPK, Genentech, South San Francisco, California 94080, In-Vivo Pharmacology, Genentech, South San Francisco, California 94080, Translational Oncology, Genentech, South San Francisco, California 94080, Discovery Chemistry, Genentech, South San Francisco, California 94080
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43
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Del Nagro C, Xiao Y, Rangell L, Reichelt M, O'Brien T. Depletion of the central metabolite NAD leads to oncosis-mediated cell death. J Biol Chem 2014; 289:35182-92. [PMID: 25355314 DOI: 10.1074/jbc.m114.580159] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Depletion of the central metabolite NAD in cells results in broad metabolic defects leading to cell death and is a proposed novel therapeutic strategy in oncology. There is, however, a limited understanding of the underlying mechanisms that connect disruption of this central metabolite with cell death. Here we utilize GNE-617, a small molecule inhibitor of NAMPT, a rate-limiting enzyme required for NAD generation, to probe the pathways leading to cell death following NAD depletion. In all cell lines examined, NAD was rapidly depleted (average t½ of 8.1 h) following NAMPT inhibition. Concurrent with NAD depletion, there was a decrease in both cell proliferation and motility, which we attribute to reduced activity of NAD-dependent deacetylases because cells fail to deacetylate α-tubulin-K40 and histone H3-K9. Following depletion of NAD by >95%, cells lose the ability to regenerate ATP. Cell lines with a slower rate of ATP depletion (average t½ of 45 h) activate caspase-3 and show evidence of apoptosis and autophagy, whereas cell lines with rapid depletion ATP (average t½ of 32 h) do not activate caspase-3 or show signs of apoptosis or autophagy. However, the predominant form of cell death in all lines is oncosis, which is driven by the loss of plasma membrane homeostasis once ATP levels are depleted by >20-fold. Thus, our work illustrates the sequence of events that occurs in cells following depletion of a key metabolite and reveals that cell death caused by a loss of NAD is primarily driven by the inability of cells to regenerate ATP.
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Affiliation(s)
| | - Yang Xiao
- From the Departments of Translational Oncology and
| | - Linda Rangell
- Pathology, Genentech Inc., South San Francisco, California 94080
| | - Mike Reichelt
- Pathology, Genentech Inc., South San Francisco, California 94080
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44
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Adams DJ, Ito D, Rees MG, Seashore-Ludlow B, Puyang X, Ramos AH, Cheah JH, Clemons PA, Warmuth M, Zhu P, Shamji AF, Schreiber SL. NAMPT is the cellular target of STF-31-like small-molecule probes. ACS Chem Biol 2014; 9:2247-54. [PMID: 25058389 PMCID: PMC4201331 DOI: 10.1021/cb500347p] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
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The small-molecule probes STF-31
and its analogue compound 146 were discovered while searching for
compounds that kill VHL-deficient renal cell carcinoma cell lines
selectively and have been reported to act via direct inhibition of
the glucose transporter GLUT1. We profiled the sensitivity of 679
cancer cell lines to STF-31 and found that the pattern of response
is tightly correlated with sensitivity to three different inhibitors
of nicotinamide phosphoribosyltransferase (NAMPT). We also performed
whole-exome next-generation sequencing of compound 146-resistant HCT116
clones and identified a recurrent NAMPT-H191R mutation. Ectopic expression
of NAMPT-H191R conferred resistance to both STF-31 and compound 146
in cell lines. We further demonstrated that both STF-31 and compound
146 inhibit the enzymatic activity of NAMPT in a biochemical assay
in vitro. Together, our cancer-cell profiling and genomic approaches
identify NAMPT inhibition as a critical mechanism by which STF-31-like
compounds inhibit cancer cells.
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Affiliation(s)
| | - Daisuke Ito
- H3 Biomedicine, Inc., 300 Technology Square, Cambridge, Massachusetts 02139, United States
| | | | | | - Xiaoling Puyang
- H3 Biomedicine, Inc., 300 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Alex H. Ramos
- H3 Biomedicine, Inc., 300 Technology Square, Cambridge, Massachusetts 02139, United States
| | | | | | - Markus Warmuth
- H3 Biomedicine, Inc., 300 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Ping Zhu
- H3 Biomedicine, Inc., 300 Technology Square, Cambridge, Massachusetts 02139, United States
| | | | - Stuart L. Schreiber
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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45
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Wang W, Elkins K, Oh A, Ho YC, Wu J, Li H, Xiao Y, Kwong M, Coons M, Brillantes B, Cheng E, Crocker L, Dragovich PS, Sampath D, Zheng X, Bair KW, O'Brien T, Belmont LD. Structural basis for resistance to diverse classes of NAMPT inhibitors. PLoS One 2014; 9:e109366. [PMID: 25285661 PMCID: PMC4186856 DOI: 10.1371/journal.pone.0109366] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Accepted: 09/08/2014] [Indexed: 01/07/2023] Open
Abstract
Inhibiting NAD biosynthesis by blocking the function of nicotinamide phosphoribosyl transferase (NAMPT) is an attractive therapeutic strategy for targeting tumor metabolism. However, the development of drug resistance commonly limits the efficacy of cancer therapeutics. This study identifies mutations in NAMPT that confer resistance to a novel NAMPT inhibitor, GNE-618, in cell culture and in vivo, thus demonstrating that the cytotoxicity of GNE-618 is on target. We determine the crystal structures of six NAMPT mutants in the apo form and in complex with various inhibitors and use cellular, biochemical and structural data to elucidate two resistance mechanisms. One is the surprising finding of allosteric modulation by mutation of residue Ser165, resulting in unwinding of an α-helix that binds the NAMPT substrate 5-phosphoribosyl-1-pyrophosphate (PRPP). The other mechanism is orthosteric blocking of inhibitor binding by mutations of Gly217. Furthermore, by evaluating a panel of diverse small molecule inhibitors, we unravel inhibitor structure activity relationships on the mutant enzymes. These results provide valuable insights into the design of next generation NAMPT inhibitors that offer improved therapeutic potential by evading certain mechanisms of resistance.
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Affiliation(s)
- Weiru Wang
- Genentech, Inc., South San Francisco, California, United States of America
| | - Kristi Elkins
- Genentech, Inc., South San Francisco, California, United States of America
| | - Angela Oh
- Genentech, Inc., South San Francisco, California, United States of America
| | - Yen-Ching Ho
- Forma Therapeutics, Inc., Watertown, Massachusetts, United States of America
| | - Jiansheng Wu
- Genentech, Inc., South San Francisco, California, United States of America
| | - Hong Li
- Genentech, Inc., South San Francisco, California, United States of America
| | - Yang Xiao
- Genentech, Inc., South San Francisco, California, United States of America
| | - Mandy Kwong
- Genentech, Inc., South San Francisco, California, United States of America
| | - Mary Coons
- Genentech, Inc., South San Francisco, California, United States of America
| | - Bobby Brillantes
- Genentech, Inc., South San Francisco, California, United States of America
| | - Eric Cheng
- Genentech, Inc., South San Francisco, California, United States of America
| | - Lisa Crocker
- Genentech, Inc., South San Francisco, California, United States of America
| | - Peter S. Dragovich
- Genentech, Inc., South San Francisco, California, United States of America
| | - Deepak Sampath
- Genentech, Inc., South San Francisco, California, United States of America
| | - Xiaozhang Zheng
- Forma Therapeutics, Inc., Watertown, Massachusetts, United States of America
| | - Kenneth W. Bair
- Forma Therapeutics, Inc., Watertown, Massachusetts, United States of America
| | - Thomas O'Brien
- Genentech, Inc., South San Francisco, California, United States of America
| | - Lisa D. Belmont
- Genentech, Inc., South San Francisco, California, United States of America
- * E-mail:
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46
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Oh A, Ho YC, Zak M, Liu Y, Chen X, Yuen PW, Zheng X, Liu Y, Dragovich PS, Wang W. Structural and biochemical analyses of the catalysis and potency impact of inhibitor phosphoribosylation by human nicotinamide phosphoribosyltransferase. Chembiochem 2014; 15:1121-30. [PMID: 24797455 DOI: 10.1002/cbic.201402023] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Indexed: 11/11/2022]
Abstract
Prolonged inhibition of nicotinamide phosphoribosyltransferase (NAMPT) is a strategy for targeting cancer metabolism. Many NAMPT inhibitors undergo NAMPT-catalyzed phosphoribosylation (pRib), a property often correlated with their cellular potency. To understand this phenomenon and facilitate drug design, we analyzed a potent cellularly active NAMPT inhibitor (GNE-617). A crystal structure of pRib-GNE-617 in complex with NAMPT protein revealed a relaxed binding mode. Consistently, the adduct formation resulted in tight binding and strong product inhibition. In contrast, a biochemically equipotent isomer of GNE-617 (GNE-643) also formed pRib adducts but displayed significantly weaker cytotoxicity. Structural analysis revealed an altered ligand conformation of GNE-643, thus suggesting weak association of the adducts with NAMPT. Our data support a model for cellularly active NAMPT inhibitors that undergo NAMPT-catalyzed phosphoribosylation to produce pRib adducts that retain efficient binding to the enzyme.
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Affiliation(s)
- Angela Oh
- Genentech, Inc., Department of Structural Biology, 1 DNA Way, South San Francisco, California 94080 (USA)
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