1
|
Morales-Martínez M, Vega MI. p38 Molecular Targeting for Next-Generation Multiple Myeloma Therapy. Cancers (Basel) 2024; 16:256. [PMID: 38254747 PMCID: PMC10813990 DOI: 10.3390/cancers16020256] [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: 11/21/2023] [Revised: 12/20/2023] [Accepted: 01/04/2024] [Indexed: 01/24/2024] Open
Abstract
Resistance to therapy and disease progression are the main causes of mortality in most cancers. In particular, the development of resistance is an important limitation affecting the efficacy of therapeutic alternatives for cancer, including chemotherapy, radiotherapy, and immunotherapy. Signaling pathways are largely responsible for the mechanisms of resistance to cancer treatment and progression, and multiple myeloma is no exception. p38 mitogen-activated protein kinase (p38) is downstream of several signaling pathways specific to treatment resistance and progression. Therefore, in recent years, developing therapeutic alternatives directed at p38 has been of great interest, in order to reverse chemotherapy resistance and prevent progression. In this review, we discuss recent findings on the role of p38, including recent advances in our understanding of its expression and activity as well as its isoforms, and its possible clinical role based on the mechanisms of resistance and progression in multiple myeloma.
Collapse
Affiliation(s)
- Mario Morales-Martínez
- Molecular Signal Pathway in Cancer Laboratory, UIMEO, Oncology Hospital, Siglo XXI National Medical Center, Mexican Institute of Social Security (IMSS), Mexico City 06720, Mexico
| | - Mario I. Vega
- Molecular Signal Pathway in Cancer Laboratory, UIMEO, Oncology Hospital, Siglo XXI National Medical Center, Mexican Institute of Social Security (IMSS), Mexico City 06720, Mexico
- Department of Medicine, Hematology-Oncology and Clinical Nutrition Division, Greater Los Angeles VA Healthcare Center, UCLA Medical Center, Jonsson Comprehensive Cancer Center, Los Angeles, CA 90095, USA
| |
Collapse
|
2
|
Abstract
There has been a paradigm shift in the treatment of myeloma triggered by intense exploration of the disease biology to understand the basis of disease development and progression and the evolution of newly diagnosed myeloma to a multidrug refractory state that is associated with poor survival. These studies have in turn informed us of potential therapeutic strategies in our ongoing effort to cure this disease, or at a minimum convert it into a chronic disease. Given the clonal evolution that leads to development of drug resistance and treatment failure, identification of specific genetic abnormalities and approaches to target these abnormalities have been on the top of the list for some time. The more recent studies examining the genome of the myeloma cell have led to development of umbrella trials that assigns patients to specific targeted agents based on the genomic abnormality. In addition, other approaches to targeting myeloma such as monoclonal antibodies are already in the clinic and are being used in all stages of disease, typically in combination with other therapies. As the therapeutic strategy evolves and we have a larger arsenal of targeted agents, we will be able to use judicious combination of drugs based on specific tumor characteristics assessed through genomic interrogation or other biologic targets. Such targeted approaches are likely to evolve to become the mainstay of myeloma therapies in the future.
Collapse
|
3
|
Cathepsin K inhibition-induced mitochondrial ROS enhances sensitivity of cancer cells to anti-cancer drugs through USP27x-mediated Bim protein stabilization. Redox Biol 2019; 30:101422. [PMID: 31901727 PMCID: PMC6948260 DOI: 10.1016/j.redox.2019.101422] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 12/26/2019] [Accepted: 12/30/2019] [Indexed: 02/07/2023] Open
Abstract
Cathepsin K (Cat K) is expressed in cancer cells, but the effect of Cat K on apoptosis is still elusive. Here, we showed that inhibition of Cat K sensitized the human carcinoma cells to anti-cancer drug through up-regulation of Bim. Inhibition of Cat K increased USP27x expression, and knock down of USP27x markedly blocked Cat K-induced up-regulation of Bim expression. Furthermore, inhibition of Cat K induced proteasome-dependent degradation of regulatory associated protein of mammalian target of rapamycin (Raptor). Down-regulation of Raptor expression increased mitochondrial ROS production, and mitochondria specific superoxide scavengers prevented USP27x-mediated stabilization of Bim by inhibition of Cat K. Moreover, combined treatment with Cat K inhibitor (odanacatib) and tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) reduced tumor growth and induced cell death in a xenograft model. Our results demonstrate that Cat K inhibition enhances anti-cancer drug sensitivity through USP27x-mediated the up-regulation of Bim via the down-regulation of Raptor. Inhibition of Cat K sensitizes cancer cells to anti-cancer drugs. Reduction of Raptor by inhibition of Cat K induces mitochondria dysfunction. Mitochondrial ROS induction by inhibition of Cat K induces USP27X expression. Up-regulation of USP27X by inhibition of Cat K stabilizes Bim protein.
Collapse
|
4
|
Xu X, Li S, Cui X, Han K, Wang J, Hou X, Cui L, He S, Xiao J, Yang Y. Inhibition of Ubiquitin Specific Protease 1 Sensitizes Colorectal Cancer Cells to DNA-Damaging Chemotherapeutics. Front Oncol 2019; 9:1406. [PMID: 31921663 PMCID: PMC6930197 DOI: 10.3389/fonc.2019.01406] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Accepted: 11/27/2019] [Indexed: 12/31/2022] Open
Abstract
Mutations and altered expression of deubiquitinating enzymes (DUBs) have been found associated with many human diseases including cancers. In this study, Ubiquitin specific protease 1 (USP1) expression was found significantly increased in some colorectal cancers (CRC). The elevated USP1 level was associated with short overall survival of patients and with advanced stages of cancers. In cultured CRC cells, knockdown of USP1 induced growth arrest at G2/M of cell cycle and reduced the expression of anti-apoptotic proteins Bcl-2 and Mcl-1. Its knockdown also led to reduction of DNA-repair related substrates FANCD2 and ID1. Further investigations found that small molecular inhibitor of USP1 ML323 sensitized CRC cells to DNA-targeting chemotherapeutics, including doxorubicin, TOPI/II inhibitors, and PARP inhibitor, but not to 5-Fu. These results indicate that USP1 plays a critical in colorectal cancer cell survival and is a promising target for anti-colorectal cancer chemotherapy. Targeting USP1 may represent an effective strategy to regulate the DNA-repairing system.
Collapse
Affiliation(s)
- Xin Xu
- Center for Systems Medicine, Suzhou Institute of Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China
| | - Shaoyan Li
- Center for Systems Medicine, Suzhou Institute of Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China.,School of Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Ximao Cui
- Department of Colorectal Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Colorectal Cancer Research Center, Shanghai, China
| | - Kunkun Han
- The Asclepius Technology Company Group and Asclepius Cancer Research Center, Suzhou, China
| | - Jun Wang
- The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Xiaodan Hou
- Center for Systems Medicine, Suzhou Institute of Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China
| | - Long Cui
- Department of Colorectal Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Shanghai Colorectal Cancer Research Center, Shanghai, China
| | - Songbing He
- The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Jiecheng Xiao
- The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Yili Yang
- Center for Systems Medicine, Suzhou Institute of Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China.,State Key Laboratory of Innovative Natural Medicine and TCM Injections, Qingfeng Pharmaceutical, Ganzhou, China
| |
Collapse
|
5
|
Anwer F, Gee KM, Iftikhar A, Baig M, Russ AD, Saeed S, Zar MA, Razzaq F, Carew J, Nawrocki S, Al-Kateb H, Cavalcante Parr NN, McBride A, Valent J, Samaras C. Future of Personalized Therapy Targeting Aberrant Signaling Pathways in Multiple Myeloma. CLINICAL LYMPHOMA, MYELOMA & LEUKEMIA 2019; 19:397-405. [PMID: 31036508 PMCID: PMC6626550 DOI: 10.1016/j.clml.2019.03.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 02/19/2019] [Accepted: 03/17/2019] [Indexed: 12/19/2022]
Abstract
Multiple myeloma (MM) is a genetically complex disease. Identification of mutations and aberrant signaling pathways that contribute to the progression of MM and drug resistance has potential to lead to specific targets and personalized treatment. Aberrant signal pathways include RAS pathway activation due to RAS or BRAF mutations (targeted by vemurafenib alone or combined with cobimetinib), BCL-2 overexpression in t(11:14) (targeted by venetoclax), JAK2 pathway activation (targeted by ruxolitinib), NF-κB pathway activation (treated with DANFIN combined with bortezomib), MDM2 overexpression, and PI3K/mTOR pathway activation (targeted by BEZ235). Cyclin D1 (CCND1) and MYC are also emerging as key potential targets. In addition, histone deacetylase inhibitors are already in use for the treatment of MM in combination therapy, and targeted inhibition of FGFR3 (AZD4547) is effective in myeloma cells with t(4;14) translocation. Bromodomain and extra terminal (BET) protein antagonists decrease the expression of MYC and have displayed promising antimyeloma activity. A better understanding of the alterations in signaling pathways that promote MM progression will further inform the development of precision therapy for patients.
Collapse
Affiliation(s)
- Faiz Anwer
- Taussig Cancer Center, Department of Hematology, Medical Oncology, Cleveland Clinic, Cleveland, OH.
| | - Kevin Mathew Gee
- Department of Molecular and Cellular Biology, The University of Arizona, Tucson, AZ
| | - Ahmad Iftikhar
- Department of Medicine, The University of Arizona, Tucson, AZ
| | - Mirza Baig
- Department of Medicine, Summit Medical Group, Summit, NJ
| | | | - Sabina Saeed
- College of Public Health, The University of Arizona, Tucson, AZ
| | - Muhammad Abu Zar
- Department of Medicine, Division of Hematology & Oncology, The University of Arizona, Tucson, AZ
| | - Faryal Razzaq
- Department of Medicine, Division of Hematology & Oncology, The University of Arizona, Tucson, AZ
| | - Jennifer Carew
- Department of Medicine, Division of Hematology & Oncology, The University of Arizona, Tucson, AZ
| | - Steffan Nawrocki
- Department of Medicine, Division of Hematology & Oncology, The University of Arizona, Tucson, AZ
| | - Hussam Al-Kateb
- Division of Human Genetics, Children's Hospital, Cincinnati, OH
| | | | - Ali McBride
- College of Pharmacy, The University of Arizona, Tucson, AZ
| | - Jason Valent
- Taussig Cancer Center, Department of Hematology, Medical Oncology, Cleveland Clinic, Cleveland, OH
| | - Christy Samaras
- Taussig Cancer Center, Department of Hematology, Medical Oncology, Cleveland Clinic, Cleveland, OH
| |
Collapse
|
6
|
Huang Z, Ge H, Yang C, Cai Y, Chen Z, Tian W, Tao J. MicroRNA‐26a‐5p inhibits breast cancer cell growth by suppressing RNF6 expression. Kaohsiung J Med Sci 2019; 35:467-473. [PMID: 31063232 DOI: 10.1002/kjm2.12085] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 04/22/2019] [Indexed: 02/06/2023] Open
Affiliation(s)
- Zi‐Ming Huang
- Department of Emergency SurgeryThe Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University Huai'an Jiangsu China
| | - Heng‐Fa Ge
- Department of Emergency SurgeryThe Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University Huai'an Jiangsu China
| | - Chen‐Chen Yang
- Department of Emergency SurgeryThe Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University Huai'an Jiangsu China
| | - Yong Cai
- Department of Emergency SurgeryThe Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University Huai'an Jiangsu China
| | - Zhen Chen
- Department of Emergency SurgeryThe Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University Huai'an Jiangsu China
| | - Wen‐Ze Tian
- Department of Cardio‐Thoracic SurgeryThe Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University Huai'an Jiangsu China
| | - Jia‐Li Tao
- Department of EmergencyThe Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University Huai'an Jiangsu China
| |
Collapse
|
7
|
Yu J, Ji C, Shi M. Nitroxoline induces cell apoptosis by inducing MDM2 degradation in small‐cell lung cancer. Kaohsiung J Med Sci 2019; 35:202-208. [PMID: 30896891 DOI: 10.1002/kjm2.12051] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 01/06/2019] [Indexed: 12/12/2022] Open
Affiliation(s)
- Jin‐Guo Yu
- Department of Respiratory MedicineThe Second Affiliated Hospital of Soochow University Suzhou China
| | - Cheng‐Hong Ji
- Department of Respiratory MedicineThe Second Affiliated Hospital of Soochow University Suzhou China
| | - Min‐Hua Shi
- Department of Respiratory MedicineThe Second Affiliated Hospital of Soochow University Suzhou China
| |
Collapse
|
8
|
Xu YY, Song YQ, Huang ZM, Zhang HB, Chen M. MicroRNA-26a inhibits multiple myeloma cell growth by suppressing cyclin-dependent kinase 6 expression. Kaohsiung J Med Sci 2019; 35:277-283. [PMID: 30897301 DOI: 10.1002/kjm2.12057] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 02/25/2019] [Indexed: 12/28/2022] Open
Abstract
MicroRNA-26a (miR-26a) has been reported to be involved in the tumorigenesis of several tumors, but its biological function and molecular mechanism in multiple myeloma (MM) are still unknown. In this study, we found that overexpression of miR-26a obviously inhibited MM cell growth, and delayed tumor growth in xenografts. Further studies showed that overexpression of miR-26a induced cell cycle arrest at G0/G1 phase in MM cells. MiR-26a mimic down-regulated the expression levels of CDK6 and E2F1, but up-regulated p53 and p21 expression. In contrast, overexpression of CDK6 decreased the effect of miR-26a mimic on MM cell survival. Moreover, miR-26a targeted CDK6 mRNA and thus suppressed CDK6 protein expression. Overexpression of miR-26a also enhanced the cytotoxic action of doxorubicin against MM. These results demonstrated that miR-26a was involved in the development of MM through regulating CDK6 signaling pathway, and indicated that miR-26a could be as a novel target for anti-tumor therapy in clinic as a single strategy or in combination with other anti-tumor drugs in MM.
Collapse
Affiliation(s)
- Ying-Ying Xu
- Department of Radiation Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China.,Department of Radiation Oncology, Zhejiang Cancer Hospital, Hangzhou, China.,Department of Radiotherapy, The Affiliated Huai'an NO. 1 People's Hospital of Nanjing Medical University, Huai'an, Jiangsu, China
| | - Ya-Qi Song
- Department of Radiotherapy, The Affiliated Huai'an NO. 1 People's Hospital of Nanjing Medical University, Huai'an, Jiangsu, China
| | - Zi-Ming Huang
- Department of Emergency Medicine, The Affiliated Huai'an NO.1 People's Hospital of Nanjing Medical University, Huai'an, Jiangsu, China
| | - Hai-Bing Zhang
- Department of Radiotherapy, Huzhou Central Hospital, Huzhou, Zhejiang, China
| | - Ming Chen
- Department of Radiation Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China.,Department of Radiation Oncology, Zhejiang Cancer Hospital, Hangzhou, China
| |
Collapse
|
9
|
Endo S, Nishimura N, Kawano Y, Ueno N, Ueno S, Tatetsu H, Komohara Y, Takeya M, Hata H, Mitsuya H, Masao M, Okuno Y. MUC1/KL-6 expression confers an aggressive phenotype upon myeloma cells. Biochem Biophys Res Commun 2018; 507:246-252. [PMID: 30420285 DOI: 10.1016/j.bbrc.2018.11.016] [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: 10/25/2018] [Accepted: 11/04/2018] [Indexed: 10/27/2022]
Abstract
The sialic glycoprotein, MUC1, is known to be involved in the pathogenesis of various types of cancers. KL-6 is one of the surface antigens of MUC1 and also a marker of interstitial pneumonitis. A fraction of patients with myeloma (3.9%) have elevated serum KL-6 levels without any evidence of interstitial pneumonitis and their myeloma cells have high MUC1 expression. We established a myeloma cell line designated EMM1 from a patient with multiple myeloma accompanied with elevated serum KL-6. EMM1 cells expressed high levels of MUC1 compared with other myeloma cell lines. Knockdown of MUC1 in EMM1 cells induced cell cycle arrest during S phase and apoptosis, suggesting that the MUC1 expression is involved in accelerated growth of EMM1 cells. RNA-seq analysis suggests that MUC1 expression activates k-ras and TNFα-induced NFκB pathways in EMM1 cells. We injected EMM1 cells subcutaneously into Rag2-/-Jak3-/- Balb/c mice to establish a mouse xenograft model. These mice had aggressive tumor growth that was accompanied by high serum KL-6 levels. In addition, MUC1 knockdown in EMM1 cells led to inhibited tumor growth. These findings demonstrate that MUC1 serves as a potential target for developing drugs for treatment of patients with KL-6+ myeloma, and EMM1 cells and EMM1-engrafted mice are useful tools for the development of such novel agents.
Collapse
Affiliation(s)
- Shinya Endo
- Departments of Hematology, Rheumatology, and Infectious Disease, Kumamoto University Graduate School of Medicine, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan
| | - Nao Nishimura
- Departments of Hematology, Rheumatology, and Infectious Disease, Kumamoto University Graduate School of Medicine, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan
| | - Yawara Kawano
- Departments of Hematology, Rheumatology, and Infectious Disease, Kumamoto University Graduate School of Medicine, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan
| | - Niina Ueno
- Departments of Hematology, Rheumatology, and Infectious Disease, Kumamoto University Graduate School of Medicine, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan
| | - Shikiko Ueno
- Departments of Hematology, Rheumatology, and Infectious Disease, Kumamoto University Graduate School of Medicine, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan
| | - Hiro Tatetsu
- Departments of Hematology, Rheumatology, and Infectious Disease, Kumamoto University Graduate School of Medicine, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan
| | - Yoshihiro Komohara
- Department of Cell Pathology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto, 860-8556, Japan
| | - Motohiro Takeya
- Department of Cell Pathology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto, 860-8556, Japan
| | - Hiroyuki Hata
- Division of Informative Clinical Sciences, Faculty of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Hiroaki Mitsuya
- Departments of Hematology, Rheumatology, and Infectious Disease, Kumamoto University Graduate School of Medicine, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan
| | - Matsuoka Masao
- Departments of Hematology, Rheumatology, and Infectious Disease, Kumamoto University Graduate School of Medicine, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan
| | - Yutaka Okuno
- Departments of Hematology, Rheumatology, and Infectious Disease, Kumamoto University Graduate School of Medicine, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan.
| |
Collapse
|
10
|
Liu Y, Wang X, Zeng S, Zhang X, Zhao J, Zhang X, Chen X, Yang W, Yang Y, Dong Z, Zhu J, Xu X, Tian F. The natural polyphenol curcumin induces apoptosis by suppressing STAT3 signaling in esophageal squamous cell carcinoma. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2018; 37:303. [PMID: 30518397 PMCID: PMC6280482 DOI: 10.1186/s13046-018-0959-0] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 11/13/2018] [Indexed: 12/12/2022]
Abstract
Background We and others have previously shown that the STAT3 signaling pathway is activated in some esophageal squamous cell carcinoma (ESCC) cells and is required for the survival and growth of these primary ESCC-derived xenografts. It has also been shown that the natural polyphenol curcumin is an effective anti-tumor agent. Methods Luciferase assay and immunoblotting were performed to examine whether curcumin suppressed STAT3 signaling. CCK-8 assay and xenografts were utilized for analyzing ESCC cell growth in culture and mice. Soft agar assay was carried out to determine the colony formation ability of ESCC cells in the presence or absence of curcumin. Cell death and cell cycle were assessed by In CELL Analyzer 2000. Immunohistochemistry and TUNEL assay were used for detecting apoptosis in ESCC tisuses. Molecular docking was performed to evaluate the interaction of curcumin with JAK2. JAK2 activity was assessed using an in vitro cell-free system. HE staining was used to evaluate the ESCC tissues. Results The natural polyphenol curcumin inhibited STAT3 phosphorylation rapidly and blocked STAT3-mediated signaling in ESCC cells. It also induced growth arrest and apoptosis in cultured ESCC cells, which were attenuated by enforced expression of STAT3. Furthermore, curcumin preferentially blocked the growth of primary ESCC-derived xenografts that harbored activated STAT3. Conclusions Curcumin is able to exert anti-tumor action through inhibiting the STAT3 signaling pathway. Giving its wide use in traditional medicines with low toxicity and few adverse reactions, it is conceivable that curcumin might be further explored as a unique STAT3 inhibitor for anti-cancer therapies.
Collapse
Affiliation(s)
- Ying Liu
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China.,Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, 450001, People's Republic of China.,Clinical Research Center, People's Hospital of Zhengzhou, Zhengzhou, Henan, 450001, People's Republic of China
| | - Xinhua Wang
- Department of Histology and Embryology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China
| | - Shuang Zeng
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China.,Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, 450001, People's Republic of China
| | - Xiane Zhang
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China.,Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, 450001, People's Republic of China
| | - Jimin Zhao
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China.,Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, 450001, People's Republic of China
| | - Xiaoyan Zhang
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China.,Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, 450001, People's Republic of China
| | - Xinhuan Chen
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China.,Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, 450001, People's Republic of China
| | - Wanjing Yang
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China.,Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, 450001, People's Republic of China
| | - Yili Yang
- Suzhou Institute of Systems Medicine, Center for Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, Jiangsu, 215123, People's Republic of China
| | - Ziming Dong
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China.,Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, 450001, People's Republic of China
| | - Jingyu Zhu
- School of Medicine and Pharmaceutics, Jiangnan University, Wuxi, Jiangsu, 214000, People's Republic of China
| | - Xin Xu
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China. .,Suzhou Institute of Systems Medicine, Center for Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, Jiangsu, 215123, People's Republic of China.
| | - Fang Tian
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, 450001, People's Republic of China. .,Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, 450001, People's Republic of China.
| |
Collapse
|
11
|
Huang Z, Cai Y, Yang C, Chen Z, Sun H, Xu Y, Chen W, Xu D, Tian W, Wang H. Knockdown of RNF6 inhibits gastric cancer cell growth by suppressing STAT3 signaling. Onco Targets Ther 2018; 11:6579-6587. [PMID: 30323630 PMCID: PMC6178940 DOI: 10.2147/ott.s174846] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Background and objective RNF6, an E3 ligase, has been reported to play an important role in the tumorigenesis in several tissues, but its role in gastric cancer is still unknown. In this study, we aimed to investigate the biological function and molecular mechanisms of RNF6 in gastric cancer. Materials and methods The expression levels of RNF6 were detected by quantitative real-time PCR (qRT-PCR) and immunoblotting in gastric cancer tissues and cell lines. Cell Counting Kit-8 assay was performed to evaluate cell proliferation. Cell apoptosis was analyzed by flow cytometer and immunoblotting. Luciferase assay, immunoblotting and qRT-PCR were performed to explore the activation of STAT3. Immunoprecipitation was performed to evaluate the ubiquitination of SHP-1. Results In this study, RNF6 was found to be upregulated in both primary tissues and cell lines of gastric cancer. Knockdown or overexpression of RNF6 inhibited or promoted cell growth of gastric cancer cells. Knockdown of RNF6 also induced the cleavage of PARP and promoted cell apoptosis in gastric cancer cells. In addition, knockdown of RNF6 also increased the cytotoxicity of doxorubicin against gastric cancer. Moreover, knockdown of RNF6 inhibited STAT3-derived luciferase activity and downregulated the phosphorylation of STAT3, but upregulated the protein level of SHP-1. Knockdown of RNF6 downregulated the expression of MCL1 and XIAP, which are target genes of STAT3. Further studies showed that RNF6 regulated the stability of SHP-1 by inducing its polyubiquitination. Conclusion These results demonstrated that RNF6 was highly expressed in gastric cancer and regulated the growth of gastric cancer cells by affecting SHP-1/STAT3 signaling, which suggested that RNF6 could be a novel target for gastric cancer therapy.
Collapse
Affiliation(s)
- Ziming Huang
- Department of Emergency Surgery, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China,
| | - Yong Cai
- Department of Emergency Surgery, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China,
| | - Chenchen Yang
- Department of Emergency Surgery, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China,
| | - Zhen Chen
- Department of Emergency Surgery, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China,
| | - Hong Sun
- Department of Emergency Surgery, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China,
| | - Yingying Xu
- Department of Radiotherapy, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China
| | - Wei Chen
- Department of Respiratory Care, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China
| | - Dafu Xu
- Department of Cardiothoracic Surgery, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China
| | - Wenze Tian
- Department of Cardiothoracic Surgery, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China
| | - Haixiao Wang
- Department of General Surgery, The Affiliated Huaian No 1 People's Hospital of Nanjing Medical University, Huai'an 223300, Jiangsu, China,
| |
Collapse
|
12
|
Protein targeting chimeric molecules specific for bromodomain and extra-terminal motif family proteins are active against pre-clinical models of multiple myeloma. Leukemia 2018; 32:2224-2239. [PMID: 29581547 PMCID: PMC6160356 DOI: 10.1038/s41375-018-0044-x] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 12/03/2017] [Accepted: 01/02/2018] [Indexed: 12/12/2022]
Abstract
Bromodomain and extraterminal (BET) domain containing protein (BRD)-4 modulates the expression of oncogenes such as c-myc, and is a promising therapeutic target in diverse cancer types. We performed pre-clinical studies in myeloma models with bi-functional protein-targeting chimeric molecules (PROTACs) which target BRD4 and other BET family members for ubiquitination and proteasomal degradation. PROTACs potently reduced the viability of myeloma cell lines in a time- and concentration-dependent manner associated with G0/G1 arrest, reduced levels of CDKs 4 and 6, increased p21 levels, and induction of apoptosis. These agents specifically decreased cellular levels of downstream BRD4 targets, including c-MYC and N-MYC, and a Cereblon-targeting PROTAC showed downstream effects similar to those of an immunomodulatory agent. Notably, PROTACs overcame bortezomib, dexamethasone, lenalidomide, and pomalidomide resistance, and their activity was maintained in otherwise isogenic myeloma cells with wild-type or deleted TP53. Combination studies showed synergistic interactions with dexamethasone, BH3 mimetics, and Akt pathway inhibitors. BET-specific PROTACs induced a rapid loss of viability of primary cells from myeloma patients, and delayed growth of MM1.S-based xenografts. Our data demonstrate that BET degraders have promising activity against pre-clinical models of multiple myeloma, and support their translation to the clinic for patients with relapsed and/or refractory disease.
Collapse
|
13
|
Xu X, Wang J, Han K, Li S, Xu F, Yang Y. Antimalarial drug mefloquine inhibits nuclear factor kappa B signaling and induces apoptosis in colorectal cancer cells. Cancer Sci 2018; 109:1220-1229. [PMID: 29453896 PMCID: PMC5891192 DOI: 10.1111/cas.13540] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Revised: 02/08/2018] [Accepted: 02/10/2018] [Indexed: 12/15/2022] Open
Abstract
Nuclear factor kappa B (NF‐κB) signaling pathway is activated in many colorectal cancer (CRC) cells and in the tumor microenvironment, which plays a critical role in cancer initiation, development, and response to therapies. In the present study, we found that the widely used antimalarial drug mefloquine was a NF‐κB inhibitor that blocked the activation of IκBα kinase, leading to reduction of IκBα degradation, decrease of p65 phosphorylation, and suppressed expression of NF‐κB target genes in CRC cells. We also found that mefloquine induced growth arrest and apoptosis of CRC cells harboring phosphorylated p65 in culture and in mice. Furthermore, expression of constitutive active IKKβ kinase significantly attenuated the cytotoxic effect of the compound. These results showed that mefloquine could exert antitumor action through inhibiting the NF‐κB signaling pathway, and indicated that the antimalarial drug might be repurposed for anti‐CRC therapy in the clinic as a single agent or in combination with other anticancer drugs.
Collapse
Affiliation(s)
- Xin Xu
- Suzhou Institute of Systems Medicine, Center for Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China
| | - Jun Wang
- Department of Emergency Medicine, First Affiliated Hospital, Soochow University, Suzhou, China
| | - Kunkun Han
- The Asclepius Technology Company Group and Asclepius Cancer Research Center, Suzhou, China
| | - Shaoyan Li
- Suzhou Institute of Systems Medicine, Center for Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China
| | - Feng Xu
- Department of Emergency Medicine, First Affiliated Hospital, Soochow University, Suzhou, China
| | - Yili Yang
- Suzhou Institute of Systems Medicine, Center for Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China.,State Key Laboratory of Innovative Natural Medicine and TCM Injections, Jiangxi Qingfeng Pharmaceutical Co. Ltd, Ganzhou, China
| |
Collapse
|
14
|
Xu X, Han K, Zhu J, Mao H, Lin X, Zhang Z, Cao B, Zeng Y, Mao X. An inhibitor of cholesterol absorption displays anti-myeloma activity by targeting the JAK2-STAT3 signaling pathway. Oncotarget 2018; 7:75539-75550. [PMID: 27705908 PMCID: PMC5342759 DOI: 10.18632/oncotarget.12265] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 09/16/2016] [Indexed: 01/08/2023] Open
Abstract
The activated JAK2-STAT3 signaling pathway is a high risk factor for multiple myeloma (MM), a fatal malignancy of plasma cells. In the present study, SC09, a potential inhibitor of cholesterol absorption, was identified in a STAT3-targeted drug screen. SC09 suppressed the activation of STAT3 in a time-course and concentration-dependent manner but did not affect its family members STAT1 and STAT5. SC09 inhibited STAT3 transcriptional activity and downregulated the expression of STAT3-regulated genes. Further studies showed that SC09 selectively inhibited JAK2 activation but not other kinases including c-Src, ERK, p38 and mTOR that are all associated with STAT3 activation. Moreover, SC09 obviously induced MM cell death in vitro and delayed MM tumor growth in vivo. SC09-induced MM cell death was dependent on the endogenous STAT3 status, and this effect could be attenuated by enforced expression of STAT3. All the results collectively indicated that SC09 blocks the JAK2-STAT3 signaling thus displaying anti-MM activity. Given its well tolerance and anti-MM potency, SC09 is credited for further investigation as a promising drug for MM treatment.
Collapse
Affiliation(s)
- Xin Xu
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Kunkun Han
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Jingyu Zhu
- School of Pharmaceutical Sciences, Jiangnan University, Wuxi, China
| | - Hongwu Mao
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Xu Lin
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Zubin Zhang
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Biyin Cao
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Yuanying Zeng
- Department of Oncology, Suzhou Municipal Hospital East Campus, Suzhou, China
| | - Xinliang Mao
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, China.,Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases, Soochow University, Suzhou, China
| |
Collapse
|
15
|
Abramson HN. Kinase inhibitors as potential agents in the treatment of multiple myeloma. Oncotarget 2018; 7:81926-81968. [PMID: 27655636 PMCID: PMC5348443 DOI: 10.18632/oncotarget.10745] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 06/30/2016] [Indexed: 12/13/2022] Open
Abstract
Recent years have witnessed a dramatic increase in the number of therapeutic options available for the treatment of multiple myeloma (MM) - from immunomodulating agents to proteasome inhibitors to histone deacetylase (HDAC) inhibitors and, most recently, monoclonal antibodies. Used in conjunction with autologous hematopoietic stem cell transplantation, these modalities have nearly doubled the disease's five-year survival rate over the last three decades to about 50%. In spite of these advances, MM still is considered incurable as resistance and relapse are common. While small molecule protein kinase inhibitors have made inroads in the therapy of a number of cancers, to date their application to MM has been less than successful. Focusing on MM, this review examines the roles played by a number of kinases in driving the malignant state and the rationale for target development in the design of a number of kinase inhibitors that have demonstrated anti-myeloma activity in both in vitro and in vivo xenograph models, as well as those that have entered clinical trials. Among the targets and their inhibitors examined are receptor and non-receptor tyrosine kinases, cell cycle control kinases, the PI3K/AKT/mTOR pathway kinases, protein kinase C, mitogen-activated protein kinase, glycogen synthase kinase, casein kinase, integrin-linked kinase, sphingosine kinase, and kinases involved in the unfolded protein response.
Collapse
Affiliation(s)
- Hanley N Abramson
- Department of Pharmaceutical Sciences, Wayne State University, Detroit, MI, USA
| |
Collapse
|
16
|
Abstract
The aim of this study was to identify the most potent quinoline-based anti-infectives for the treatment of multiple myeloma (MM) and to understand the molecular mechanisms. A small-scale screen against a panel of marketed quinoline-based drugs was performed in MM cell lines. Cell apoptosis was examined by flow cytometry. Anti-MM activity was also evaluated in nude mice. Western blotting was performed to investigate mechanisms. Nitroxoline (NXQ) was the most effective in suppressing MM cell proliferation. NXQ induced more than 40% MM cell apoptosis within 24 h and potentiated anti-MM activities of current major drugs including doxorubicin and lenalidomide. This finding was shown by activation of caspase-3, a major executive apoptotic enzyme, and by inactivation of PARP, a major enzyme in DNA damage repair. NXQ also suppressed prosurvival proteins Bcl-xL and Mcl-1. Moreover, NXQ suppressed the growth of myeloma xenografts in nude mice models. In the mechanistic study, NXQ was found to downregulate TRIM25, a highly expressed ubiquitin ligase in MM. Notably, NXQ upregulated tumor suppressor p53, but not PTEN. Furthermore, overexpression of TRIM25 decreased p53 protein. This study indicated that the long-term use of anti-infective NXQ has potential for MM treatment by targeting the TRIM25/p53 axle.
Collapse
|
17
|
Zeng Y, Xu X, Wang S, Zhang Z, Liu Y, Han K, Cao B, Mao X. Ring finger protein 6 promotes breast cancer cell proliferation by stabilizing estrogen receptor alpha. Oncotarget 2017; 8:20103-20112. [PMID: 28223545 PMCID: PMC5386747 DOI: 10.18632/oncotarget.15384] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 01/22/2017] [Indexed: 12/19/2022] Open
Abstract
Ring finger protein 6 (RNF6) is a key oncogene in both prostate cancer and leukemia, but its role is elusive in breast cancer. In the present study, we found that RNF6 was overexpressed in more than 70% of breast cancer tissues and it was associated with overall survival. RNF6 increased breast cancer cell proliferation, migration and reduced cell sensitivity to doxorubicin. Further studies showed that RNF6 was closely associated with increased expression of estrogen receptor, a critical factor in the development of breast cancers. RNF6 was found to induce ERα expression and increased its stability. In doxorubicin-resistant breast cancer cells, RNF6 was found to be elevated in association with increased ERα and anti-apoptotic Bcl-xL, but not pro-apoptotic Bim-1. In consistence with this finding, overexpression of ERα led to increased Bcl-xL but had no effects on Bim-1. Therefore, this study demonstrated that there exists an RNF6/ERα/Bcl-xL axle in breast cancer which promotes cancer cell proliferation and survival. Targeting the RNF6/ERα/Bcl-xL axle could be a promising strategy in the treatment of breast cancer.
Collapse
Affiliation(s)
- Yuanying Zeng
- Jiangsu Key Laboratory for Translational Research and Therapeutics of Neuro-Psycho- Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, 215123, P. R. China.,Department of Oncology, Suzhou Municipal Hospital East Campus, Suzhou, 215100, P.R. China
| | - Xin Xu
- Jiangsu Key Laboratory for Translational Research and Therapeutics of Neuro-Psycho- Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, 215123, P. R. China.,Suzhou Institute of Systems Medicine, Center of Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, 215123, P. R. China
| | - Siyu Wang
- Jiangsu Key Laboratory for Translational Research and Therapeutics of Neuro-Psycho- Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Zubin Zhang
- Jiangsu Key Laboratory for Translational Research and Therapeutics of Neuro-Psycho- Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Yan Liu
- Jiangsu Key Laboratory for Translational Research and Therapeutics of Neuro-Psycho- Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Kunkun Han
- Jiangsu Key Laboratory for Translational Research and Therapeutics of Neuro-Psycho- Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Biyin Cao
- Jiangsu Key Laboratory for Translational Research and Therapeutics of Neuro-Psycho- Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Xinliang Mao
- Jiangsu Key Laboratory for Translational Research and Therapeutics of Neuro-Psycho- Diseases, Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, 215123, P. R. China.,Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases, Soochow University, Suzhou, 215123, P. R. China.,Key Laboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou 511436, P. R. China
| |
Collapse
|
18
|
Hodson N, McGlory C, Oikawa SY, Jeromson S, Song Z, Rüegg MA, Hamilton DL, Phillips SM, Philp A. Differential localization and anabolic responsiveness of mTOR complexes in human skeletal muscle in response to feeding and exercise. Am J Physiol Cell Physiol 2017; 313:C604-C611. [PMID: 28971834 DOI: 10.1152/ajpcell.00176.2017] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 09/22/2017] [Accepted: 09/23/2017] [Indexed: 12/31/2022]
Abstract
Mechanistic target of rapamycin (mTOR) resides as two complexes within skeletal muscle. mTOR complex 1 [mTORC1-regulatory associated protein of mTOR (Raptor) positive] regulates skeletal muscle growth, whereas mTORC2 [rapamycin-insensitive companion of mTOR (Rictor) positive] regulates insulin sensitivity. To examine the regulation of these complexes in human skeletal muscle, we utilized immunohistochemical analysis to study the localization of mTOR complexes before and following protein-carbohydrate feeding (FED) and resistance exercise plus protein-carbohydrate feeding (EXFED) in a unilateral exercise model. In basal samples, mTOR and the lysosomal marker lysosomal associated membrane protein 2 (LAMP2) were highly colocalized and remained so throughout. In the FED and EXFED states, mTOR/LAMP2 complexes were redistributed to the cell periphery [wheat germ agglutinin (WGA)-positive staining] (time effect; P = 0.025), with 39% (FED) and 26% (EXFED) increases in mTOR/WGA association observed 1 h post-feeding/exercise. mTOR/WGA colocalization continued to increase in EXFED at 3 h (48% above baseline) whereas colocalization decreased in FED (21% above baseline). A significant effect of condition (P = 0.05) was noted suggesting mTOR/WGA colocalization was greater during EXFED. This pattern was replicated in Raptor/WGA association, where a significant difference between EXFED and FED was noted at 3 h post-exercise/feeding (P = 0.014). Rictor/WGA colocalization remained unaltered throughout the trial. Alterations in mTORC1 cellular location coincided with elevated S6K1 kinase activity, which rose to a greater extent in EXFED compared with FED at 1 h post-exercise/feeding (P < 0.001), and only remained elevated in EXFED at the 3 h time point (P = 0.037). Collectively these data suggest that mTORC1 redistribution within the cell is a fundamental response to resistance exercise and feeding, whereas mTORC2 is predominantly situated at the sarcolemma and does not alter localization.
Collapse
Affiliation(s)
- Nathan Hodson
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Chris McGlory
- Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| | - Sara Y Oikawa
- Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| | - Stewart Jeromson
- Faculty of Health Sciences and Sport, University of Stirling, Stirling, United Kingdom; and
| | - Zhe Song
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | | | - D Lee Hamilton
- Faculty of Health Sciences and Sport, University of Stirling, Stirling, United Kingdom; and
| | - Stuart M Phillips
- Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| | - Andrew Philp
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom;
| |
Collapse
|
19
|
Jiang Y, Liu P, Jiao W, Meng J, Feng J. Gax suppresses chemerin/CMKLR1‐induced preadipocyte biofunctions through the inhibition of Akt/mTOR and ERK signaling pathways. J Cell Physiol 2017; 233:572-586. [DOI: 10.1002/jcp.25918] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 03/17/2017] [Indexed: 12/19/2022]
Affiliation(s)
- Yunqi Jiang
- Department of CardiologyThe Second Hospital of Shandong UniversityJinanShandongChina
| | - Ping Liu
- Department of CardiologyThe Second Hospital of Shandong UniversityJinanShandongChina
| | - Wenlin Jiao
- College of PharmacyShandong UniversityJinanShandongChina
| | - Juan Meng
- Department of CardiologyThe Second Hospital of Shandong UniversityJinanShandongChina
| | - Jinbo Feng
- Central LaboratoryThe Qilu Hospital of Shandong UniversityJinanShandongChina
| |
Collapse
|
20
|
Fairfield H, Falank C, Avery L, Reagan MR. Multiple myeloma in the marrow: pathogenesis and treatments. Ann N Y Acad Sci 2016; 1364:32-51. [PMID: 27002787 PMCID: PMC4806534 DOI: 10.1111/nyas.13038] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Multiple myeloma (MM) is a B cell malignancy resulting in osteolytic lesions and fractures. In the disease state, bone healing is limited owing to increased osteoclastic and decreased osteoblastic activity, as well as an MM-induced forward-feedback cycle where bone-embedded growth factors further enhance tumor progression as bone is resorbed. Recent work on somatic mutation in MM tumors has provided insight into cytogenetic changes associated with this disease; the initiating driver mutations causing MM are diverse because of the complexity and multitude of mutations inherent in MM tumor cells. This manuscript provides an overview of MM pathogenesis by summarizing cytogenic changes related to oncogenes and tumor suppressors associated with MM, reviewing risk factors, and describing the disease progression from monoclonal gammopathy of undetermined significance to overt MM. It also highlights the importance of the bone marrow microenvironment (BMM) in the establishment and progression of MM, as well as associated MM-induced bone disease, and the relationship of the bone marrow to current and future therapeutics. This review highlights why understanding the basic biology of the healthy and diseased BMM is crucial in the quest for better treatments and work toward a cure for genetically diverse diseases such as MM.
Collapse
Affiliation(s)
| | | | | | - Michaela R Reagan
- Maine Medical Center Research Institute, Scarborough, Maine
- University of Maine, Orono, Maine
| |
Collapse
|