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Ardjmand D, Kubota Y, Sato M, Han Q, Mizuta K, Morinaga S, Hoffman RM. Selective Synergy of Rapamycin Combined With Methioninase on Cancer Cells Compared to Normal Cells. Anticancer Res 2024; 44:929-933. [PMID: 38423628 DOI: 10.21873/anticanres.16887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 12/21/2023] [Accepted: 01/10/2024] [Indexed: 03/02/2024]
Abstract
BACKGROUND/AIM Rapamycin and recombinant methioninase (rMETase) have both shown efficacy to target cancer cells. Rapamycin prevents cancer-cell growth by inhibition of the mTOR protein kinase. rMETase, by degrading methionine, targets the methionine addiction of cancer and has been shown to improve the efficacy of chemotherapy drugs. In the present study, we aimed to determine if a synergy exists between rapamycin and rMETase when used in combination against a colorectal-carcinoma cell line, compared to normal fibroblasts, in vitro. MATERIALS AND METHODS The half-maximal inhibitory concentrations (IC50) of rapamycin alone and rMETase alone against the HCT-116 human colorectal-cancer cell line and Hs-27 human fibroblasts were determined using the CCK-8 Cell Viability Assay. After calculating the IC50 of each drug, we determined the efficacy of rapamycin and rMETase combined on both HCT-116 and Hs-27. RESULTS Hs-27 normal fibroblasts were more sensitive to rapamycin than HCT-116 colon-cancer cells (IC50=0.37 nM and IC50=1.38 nM, respectively). HCT-116 cells were more sensitive to rMETase than Hs-27 cells (IC50 0.39 U/ml and IC50 0.96 U/ml, respectively). The treatment of Hs-27 cells with the combination of rapamycin (IC50=0.37 nM) and rMETase (IC50=0.96 U/ml) showed no significant difference in their effect on Hs-27 cell viability compared to the two drugs being used separately. However, the treatment of HCT-116 cells with the combination of rapamycin (IC50=1.38 nM) and rMETase (IC50=0.39 U/ml) was able to decrease cancer-cell viability significantly more than either single-drug treatment. CONCLUSION Rapamycin and rMETase, when used in combination against colorectal-cancer cells, but not normal fibroblasts, in vitro, have a cancer-specific synergistic effect, suggesting that the combination of these drugs can be used as an effective, targeted cancer therapy.
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Affiliation(s)
| | - Yutaro Kubota
- AntiCancer Inc., San Diego, CA, U.S.A
- Department of Surgery, University of California San Diego, San Diego, CA, U.S.A
| | - Motokazu Sato
- AntiCancer Inc., San Diego, CA, U.S.A
- Department of Surgery, University of California San Diego, San Diego, CA, U.S.A
| | | | - Kohei Mizuta
- AntiCancer Inc., San Diego, CA, U.S.A
- Department of Surgery, University of California San Diego, San Diego, CA, U.S.A
| | - Sei Morinaga
- AntiCancer Inc., San Diego, CA, U.S.A
- Department of Surgery, University of California San Diego, San Diego, CA, U.S.A
| | - Robert M Hoffman
- AntiCancer Inc., San Diego, CA, U.S.A.;
- Department of Surgery, University of California San Diego, San Diego, CA, U.S.A
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Rathore R, Caldwell KE, Schutt C, Brashears CB, Prudner BC, Ehrhardt WR, Leung CH, Lin H, Daw NC, Beird HC, Giles A, Wang WL, Lazar AJ, Chrisinger JSA, Livingston JA, Van Tine BA. Metabolic compensation activates pro-survival mTORC1 signaling upon 3-phosphoglycerate dehydrogenase inhibition in osteosarcoma. Cell Rep 2021; 34:108678. [PMID: 33503424 PMCID: PMC8552368 DOI: 10.1016/j.celrep.2020.108678] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 11/03/2020] [Accepted: 12/20/2020] [Indexed: 12/11/2022] Open
Abstract
Osteosarcoma is the most common pediatric and adult primary malignant bone cancer. Curative regimens target the folate pathway, downstream of serine metabolism, with high-dose methotrexate. Here, the rate-limiting enzyme in the biosynthesis of serine from glucose, 3-phosphoglycerate dehydrogenase (PHGDH), is examined, and an inverse correlation between PHGDH expression and relapse-free and overall survival in osteosarcoma patients is found. PHGDH inhibition in osteosarcoma cell lines attenuated cellular proliferation without causing cell death, prompting a robust metabolic analysis to characterize pro-survival compensation. Using metabolomic and lipidomic profiling, cellular response to PHGDH inhibition is identified as accumulation of unsaturated lipids, branched chain amino acids, and methionine cycle intermediates, leading to activation of pro-survival mammalian target of rapamycin complex 1 (mTORC1) signaling. Increased mTORC1 activation sensitizes cells to mTORC1 pathway inhibition, resulting in significant, synergistic cell death in vitro and in vivo. Identifying a therapeutic combination for PHGDH-high cancers offers preclinical justification for a dual metabolism-based combination therapy for osteosarcoma.
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Affiliation(s)
- Richa Rathore
- Department of Medicine, Division of Medical Oncology, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Katharine E Caldwell
- Department of Surgery, Division of Hepatobiliary Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Charles Schutt
- Department of Medicine, Division of Medical Oncology, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Caitlyn B Brashears
- Department of Medicine, Division of Medical Oncology, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Bethany C Prudner
- Department of Medicine, Division of Medical Oncology, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - William R Ehrhardt
- Department of Medicine, Division of Medical Oncology, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Cheuk Hong Leung
- Department of Biostatistics, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Heather Lin
- Department of Biostatistics, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Najat C Daw
- Division of Pediatrics, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Hannah C Beird
- Department of Genomic Medicine, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Abigail Giles
- Department of Medicine, Division of Medical Oncology, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Wei-Lien Wang
- Department of Pathology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Alexander J Lazar
- Department of Genomic Medicine, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; Department of Pathology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - John S A Chrisinger
- Department of Pathology and Immunology, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - J Andrew Livingston
- Department of Pathology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; Department of Sarcoma Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Brian A Van Tine
- Department of Medicine, Division of Medical Oncology, Washington University in St. Louis, St. Louis, MO 63110, USA; Siteman Cancer Center, St. Louis, MO 63110, USA.
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Kitada M, Xu J, Ogura Y, Monno I, Koya D. Mechanism of Activation of Mechanistic Target of Rapamycin Complex 1 by Methionine. Front Cell Dev Biol 2020; 8:715. [PMID: 32850834 PMCID: PMC7431653 DOI: 10.3389/fcell.2020.00715] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 07/13/2020] [Indexed: 12/25/2022] Open
Abstract
Nutrients are closely involved in the regulation of lifespan and metabolic health. Cellular activities, such as the regulation of metabolism, growth, and aging, are mediated by a network of nutrients and nutrient-sensing pathways. Among the nutrient-sensing pathways, the mechanistic target of rapamycin complex 1 (mTORC1) acts as the central regulator of cellular functions, which include autophagy. Autophagy plays a significant role in the removal of protein aggregates and damaged or excess organelles, including mitochondria, to maintain intracellular homeostasis, which is involved in lifespan extension and cardiometabolic health. Moreover, dietary methionine restriction may have a beneficial effect on lifespan extension and metabolic health. In contrast, methionine may activate mTORC1 and suppress autophagy. As the mechanism of methionine sensing on mTORC1, SAMTOR was identified as a sensor of S-adenosyl methionine (SAM), a metabolite of methionine, in the cytoplasm. Conversely, methionine may activate the mTORC1 signaling pathway through the activation of phosphatase 2A (PP2A) because of increased methylation in response to intracellular SAM levels. In this review, we summarized the recent findings regarding the mechanism via which methionine activates mTORC1.
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Affiliation(s)
- Munehiro Kitada
- Department of Diabetology and Endocrinology, Kanazawa Medical University, Uchinada, Japan.,Division of Anticipatory Molecular Food Science and Technology, Medical Research Institute, Kanazawa Medical University, Uchinada, Japan
| | - Jing Xu
- Department of Diabetology and Endocrinology, Kanazawa Medical University, Uchinada, Japan
| | - Yoshio Ogura
- Department of Diabetology and Endocrinology, Kanazawa Medical University, Uchinada, Japan
| | - Itaru Monno
- Department of Diabetology and Endocrinology, Kanazawa Medical University, Uchinada, Japan
| | - Daisuke Koya
- Department of Diabetology and Endocrinology, Kanazawa Medical University, Uchinada, Japan.,Division of Anticipatory Molecular Food Science and Technology, Medical Research Institute, Kanazawa Medical University, Uchinada, Japan
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