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Tang H, Wu K, Wang J, Vinjamuri S, Gu Y, Song S, Wang Z, Zhang Q, Balistrieri A, Ayon RJ, Rischard F, Vanderpool R, Chen J, Zhou G, Desai AA, Black SM, Garcia JGN, Yuan JXJ, Makino A. Pathogenic Role of mTORC1 and mTORC2 in Pulmonary Hypertension. JACC Basic Transl Sci 2018; 3:744-762. [PMID: 30623134 PMCID: PMC6314964 DOI: 10.1016/j.jacbts.2018.08.009] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 06/23/2018] [Accepted: 08/16/2018] [Indexed: 01/07/2023]
Abstract
G protein-coupled receptors and tyrosine kinase receptors signal through the phosphoinositide 3-kinase/Akt/mTOR pathway to induce cell proliferation, survival, and growth. mTOR is a kinase present in 2 functionally distinct complexes, mTORC1 and mTORC2. Functional disruption of mTORC1 by knockout of Raptor (regulatory associated protein of mammalian target of rapamycin) in smooth muscle cells ameliorated the development of experimental PH. Functional disruption of mTORC2 by knockout of Rictor (rapamycin insensitive companion of mammalian target of rapamycin) caused spontaneous PH by up-regulating platelet-derived growth factor receptors. Use of mTOR inhibitors (e.g., rapamycin) to treat PH should be accompanied by inhibitors of platelet-derived growth factor receptors (e.g., imatinib).
Concentric lung vascular wall thickening due to enhanced proliferation of pulmonary arterial smooth muscle cells is an important pathological cause for the elevated pulmonary vascular resistance reported in patients with pulmonary arterial hypertension. We identified a differential role of mammalian target of rapamycin (mTOR) complex 1 and complex 2, two functionally distinct mTOR complexes, in the development of pulmonary hypertension (PH). Inhibition of mTOR complex 1 attenuated the development of PH; however, inhibition of mTOR complex 2 caused spontaneous PH, potentially due to up-regulation of platelet-derived growth factor receptors in pulmonary arterial smooth muscle cells, and compromised the therapeutic effect of the mTOR inhibitors on PH. In addition, we describe a promising therapeutic strategy using combination treatment with the mTOR inhibitors and the platelet-derived growth factor receptor inhibitors on PH and right ventricular hypertrophy. The data from this study provide an important mechanism-based perspective for developing novel therapies for patients with pulmonary arterial hypertension and right heart failure.
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Key Words
- EC, endothelial cell
- FOXO3a, Forkhead box O3a
- GPCR, G protein-coupled receptor
- HPH, hypoxia-induced pulmonary hypertension
- PA, pulmonary artery
- PAEC, pulmonary arterial endothelial cell
- PAH, pulmonary arterial hypertension
- PASMC, pulmonary arterial smooth muscle cell
- PDGF, platelet-derived growth factor
- PDGFR, platelet-derived growth factor receptor
- PH, pulmonary hypertension
- PI3K, phosphoinositide 3-kinase
- PTEN, phosphatase and tensin homolog
- PVR, pulmonary vascular resistance
- RVH, right ventricular hypertrophy
- RVSP, right ventricular systolic pressure
- Raptor
- Raptor, regulatory associated protein of mammalian target of rapamycin
- Rictor
- Rictor, rapamycin insensitive companion of mammalian target of rapamycin
- SM, smooth muscle
- TKR, tyrosine kinase receptor
- WT, wild-type
- mTOR
- mTORC1, mammalian target of rapamycin complex 1
- mTORC2, mammalian target of rapamycin complex 2
- pAKT, phosphorylated AKT
- pulmonary hypertension
- right ventricle
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Affiliation(s)
- Haiyang Tang
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Kang Wu
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Jian Wang
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Sujana Vinjamuri
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona
| | - Yali Gu
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona
| | - Shanshan Song
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona
| | - Ziyi Wang
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Qian Zhang
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China.,Department of Physiology, The University of Arizona College of Medicine, Tucson, Arizona
| | - Angela Balistrieri
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona
| | - Ramon J Ayon
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona
| | - Franz Rischard
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, The University of Arizona College of Medicine, Tucson, Arizona
| | - Rebecca Vanderpool
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona
| | - Jiwang Chen
- Department of Pediatrics, University of Illinois College of Medicine, Chicago, Illinois
| | - Guofei Zhou
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China.,Department of Pediatrics, University of Illinois College of Medicine, Chicago, Illinois
| | - Ankit A Desai
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,Division of Cardiology, Department of Medicine, The University of Arizona College of Medicine, Tucson, Arizona
| | - Stephen M Black
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,Department of Physiology, The University of Arizona College of Medicine, Tucson, Arizona
| | - Joe G N Garcia
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,Department of Physiology, The University of Arizona College of Medicine, Tucson, Arizona.,Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, The University of Arizona College of Medicine, Tucson, Arizona
| | - Jason X-J Yuan
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China.,Department of Physiology, The University of Arizona College of Medicine, Tucson, Arizona
| | - Ayako Makino
- Division of Translational and Regenerative Medicine, The University of Arizona College of Medicine, Tucson, Arizona.,Department of Physiology, The University of Arizona College of Medicine, Tucson, Arizona
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Youssef RF, Cost NG, Darwish OM, Margulis V. Prognostic markers in renal cell carcinoma: A focus on the 'mammalian target of rapamycin' pathway. Arab J Urol 2012; 10:110-7. [PMID: 26558012 PMCID: PMC4442886 DOI: 10.1016/j.aju.2012.02.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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: 02/01/2012] [Revised: 02/23/2012] [Accepted: 02/25/2012] [Indexed: 11/25/2022] Open
Abstract
Objectives Increased knowledge about the molecular pathways involved in tumorigenesis has led to the discovery of new prognostic molecular markers and development of novel targeted therapies for renal cell carcinoma (RCC). In this review we describe the prognostic markers of RCC and highlight the areas of recent discovery with a focus on the mammalian target of rapamycin (mTOR) pathway. Methods We reviewed previous reports, using PubMed with the search terms ‘renal cell carcinoma’, ‘molecular markers’, ‘prognosis’, ‘outcomes’ and ‘mammalian target of rapamycin pathway’ published in the last two decades. We created a library of 100 references and focused on presenting the recent advances in the field. Results Growing evidence suggests that mTOR deregulation is associated with many types of human cancer, including RCC. Consequently, temsirolimus and everolimus, which target mTOR, are approved for treating advanced RCC. There is a demand to integrate clinical, pathological and molecular markers into accurate prognostic models to provide patients with the most personalised cancer care possible. Conclusions The mTOR pathway is highly implicated in RCC tumorigenesis and progression, and its constituents might represent a promising prognostic tool and target for treating RCC. Combining newly discovered molecular markers with classic clinicopathological prognostics might potentially improve the management of RCC.
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Key Words
- 4E-BP1, eukaryotic initiation factor-binding protein-1
- CA-9, carbonic anhydrase 9
- HIF, hypoxia inducible factor
- IRS-1, insulin receptor substrate-1
- LDH, lactate dehydrogenase
- Molecular markers
- PI3k, phosphatidylinositol 3-kinase
- Prognostic
- Renal cell carcinoma
- S6K1, S6 kinase 1
- TKR, tyrosine kinase receptor
- TSC, tuberous sclerosis complex
- VEGF, vascular endothelial growth factor
- VHL, von Hippel-Lindau
- mTOR
- mTOR, mammalian target of rapamycin
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Affiliation(s)
- Ramy F Youssef
- Division of Urologic Oncology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Nicholas G Cost
- Division of Urologic Oncology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Oussama M Darwish
- Division of Urologic Oncology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Vitaly Margulis
- Division of Urologic Oncology, University of Texas Southwestern Medical Center, Dallas, TX, USA
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