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Cytotoxicity Assessment of a New Design for a Biodegradable Ureteral Mitomycin Drug-Eluting Stent in Urothelial Carcinoma Cell Culture. Polymers (Basel) 2022; 14:polym14194081. [PMID: 36236029 PMCID: PMC9570871 DOI: 10.3390/polym14194081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 09/10/2022] [Accepted: 09/24/2022] [Indexed: 11/29/2022] Open
Abstract
Urothelial tumour of the upper urinary tract is a rare neoplasm, but unfortunately, it has a high recurrence rate. The reduction of these tumour recurrences could be achieved by the intracavitary instillation of adjuvant chemotherapy after nephron-sparing treatment in selected patients, but current instillation methods are ineffective. Therefore, the aim of this in vitro study is to evaluate the cytotoxic capacity of a new instillation technology through a biodegradable ureteral stent/scaffold coated with a silk fibroin matrix for the controlled release of mitomycin C as an anti-cancer drug. Through a comparative study, we assessed, in urothelial carcinoma cells in a human cancer T24 cell culture for 3 and 6 h, the cytotoxic capacity of mitomycin C by viability assay using the CCK-8 test (Cell counting Kit-8). Cell viability studies in the urothelial carcinoma cell line confirm that mitomycin C embedded in the polymeric matrix does not alter its cytotoxic properties and causes a significant decrease in cell viability at 6 h versus in the control groups. These findings have a clear biomedical application and could be of great use to decrease the recurrence rate in patients with upper tract urothelial carcinomas by increasing the dwell time of anti-cancer drugs.
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2
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Chen X, Wang D, Wang G, Huang Y, Yu X, Lu J, Zhai X, Xu H, Li Z. Optimization of Initial Dose Regimen for Sirolimus in Pediatric Patients With Lymphangioma. Front Pharmacol 2021; 12:668952. [PMID: 34819851 PMCID: PMC8606893 DOI: 10.3389/fphar.2021.668952] [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: 02/17/2021] [Accepted: 10/26/2021] [Indexed: 12/14/2022] Open
Abstract
Sirolimus is an effective oral treatment for pediatric patients with lymphangioma. The present clinical study in 15 children (0.12–16.39 years of age) examines the effects of underlying factors on sirolimus concentrations through application of a population pharmacokinetic model. Using Monte Carlo simulation, an initial dose regimen for sirolimus in pediatric patients with lymphangioma is presented. It is found that the lower the body weight, the higher the clearance rate and sirolimus clearances are 0.31–0.17 L/h/kg in pediatric patients with lymphangioma whose weights are 5–60 kg, respectively. The doses of sirolimus, 0.07, 0.06, 0.05 mg/kg/day are recommended for weights of 5–10, 10–24.5 and 24.5–60 kg in children with lymphangioma. This study is the first to establish a population pharmacokinetic model for sirolimus and to recommend initial doses in pediatric patients with lymphangioma. Large scale, prospective studies are needed in the future.
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Affiliation(s)
- Xiao Chen
- Department of Pharmacy, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Dongdong Wang
- Department of Pharmacy, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Guangfei Wang
- Department of Pharmacy, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Yidie Huang
- Department of Pharmacy, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Xin Yu
- Department of Pharmacy, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Jinmiao Lu
- Department of Pharmacy, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Xiaowen Zhai
- Department of Hematology and Oncology, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Hong Xu
- Department of Nephrology, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Zhiping Li
- Department of Pharmacy, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
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3
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Non-muscle-invasive bladder cancer: An overview of potential new treatment options. Urol Oncol 2021; 39:642-663. [PMID: 34167873 DOI: 10.1016/j.urolonc.2021.05.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 04/29/2021] [Accepted: 05/09/2021] [Indexed: 01/22/2023]
Abstract
AIM This review article summarizes the current clinical practice guidelines around disease definitions and risk stratifications, and the treatment of non-muscle-invasive bladder cancer (NMIBC). Recently completed and ongoing clinical trials of novel and investigational therapies in Bacillus Calmette-Guérin (BCG)-naïve, BCG-recurrent, and BCG-unresponsive patient populations are also described, e.g., those involving immune checkpoint inhibitors, targeted therapies, other chemotherapy regimens, vaccines, and viral- or bacterial-based treatments. Finally, a brief overview of enhanced cystoscopy and drug delivery systems for the diagnosis and treatment of NMIBC is provided. BACKGROUND A global shortage of access to BCG is affecting the management of BCG-naïve and BCG-recurrent/unresponsive NMIBC; hence, there is an urgent need to assist patients and urologists to enhance the treatment of this disease. METHODS Searches of ClinicalTrials.gov, PubMed, and Google Scholar were conducted. Published guidance and conference proceedings from major congresses were reviewed. CONCLUSION Treatment strategies for NMIBC are generally consistent across guidelines. Several novel therapies have demonstrated promising antitumor activity in clinical trials, including in high-risk or BCG-unresponsive disease. The detection, diagnosis, surveillance, and treatment of NMIBC have also been improved through enhanced disease detection.
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4
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Mollaei M, Hassan ZM, Khorshidi F, Langroudi L. Chemotherapeutic drugs: Cell death- and resistance-related signaling pathways. Are they really as smart as the tumor cells? Transl Oncol 2021; 14:101056. [PMID: 33684837 PMCID: PMC7938256 DOI: 10.1016/j.tranon.2021.101056] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/05/2021] [Accepted: 02/22/2021] [Indexed: 02/07/2023] Open
Abstract
Chemotherapeutic drugs kill cancer cells or control their progression all over the patient's body, while radiation- and surgery-based treatments perform in a particular site. Based on their mechanisms of action, they are classified into different groups, including alkylating substrates, antimetabolite agents, anti-tumor antibiotics, inhibitors of topoisomerase I and II, mitotic inhibitors, and finally, corticosteroids. Although chemotherapeutic drugs have brought about more life expectancy, two major and severe complications during chemotherapy are chemoresistance and tumor relapse. Therefore, we aimed to review the underlying intracellular signaling pathways involved in cell death and resistance in different chemotherapeutic drug families to clarify the shortcomings in the conventional single chemotherapy applications. Moreover, we have summarized the current combination chemotherapy applications, including numerous combined-, and encapsulated-combined-chemotherapeutic drugs. We further discussed the possibilities and applications of precision medicine, machine learning, next-generation sequencing (NGS), and whole-exome sequencing (WES) in promoting cancer immunotherapies. Finally, some of the recent clinical trials concerning the application of immunotherapies and combination chemotherapies were included as well, in order to provide a practical perspective toward the future of therapies in cancer cases.
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Affiliation(s)
- Mojtaba Mollaei
- Department of Immunology, School of Medicine, Tarbiat Modares University, Tehran, Iran.
| | | | - Fatemeh Khorshidi
- Department of Immunology, School of Medicine, Tarbiat Modares University, Tehran, Iran; Department of Immunology, Pasteur Institute of Iran, Tehran, Iran
| | - Ladan Langroudi
- Department of Immunology, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
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5
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Achkar IW, Abdulrahman N, Al-Sulaiti H, Joseph JM, Uddin S, Mraiche F. Cisplatin based therapy: the role of the mitogen activated protein kinase signaling pathway. J Transl Med 2018; 16:96. [PMID: 29642900 PMCID: PMC5896132 DOI: 10.1186/s12967-018-1471-1] [Citation(s) in RCA: 117] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 04/02/2018] [Indexed: 12/19/2022] Open
Abstract
Cisplatin is a widely used chemotherapeutic agent for treatment of various cancers. However, treatment with cisplatin is associated with drug resistance and several adverse side effects such as nephrotoxicity, reduced immunity towards infections and hearing loss. A Combination of cisplatin with other drugs is an approach to overcome drug resistance and reduce toxicity. The combination therapy also results in increased sensitivity of cisplatin towards cancer cells. The mitogen activated protein kinase (MAPK) pathway in the cell, consisting of extracellular signal regulated kinase, c-Jun N-terminal kinase, p38 kinases, and downstream mediator p90 ribosomal s6 kinase (RSK); is responsible for the regulation of various cellular events including cell survival, cell proliferation, cell cycle progression, cell migration and protein translation. This review article demonstrates the role of MAPK pathway in cisplatin based therapy, illustrates different combination therapy involving cisplatin and also shows the importance of targeting MAPK family, particularly RSK, to achieve increased anticancer effect and overcome drug resistance when combined with cisplatin.
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Affiliation(s)
- Iman W Achkar
- Translational Research Institute, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar
| | | | - Hend Al-Sulaiti
- College of Pharmacy, Qatar University, P.O. Box 2713, Doha, Qatar
| | | | - Shahab Uddin
- Translational Research Institute, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar
| | - Fatima Mraiche
- College of Pharmacy, Qatar University, P.O. Box 2713, Doha, Qatar.
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6
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Pinto-Leite R, Arantes-Rodrigues R, Sousa N, Oliveira PA, Santos L. mTOR inhibitors in urinary bladder cancer. Tumour Biol 2016; 37:11541-11551. [PMID: 27235118 DOI: 10.1007/s13277-016-5083-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 05/15/2016] [Indexed: 02/07/2023] Open
Abstract
Despite the great scientific advances that have been made in cancer treatment, there is still much to do, particularly with regard to urinary bladder cancer. Some of the drugs used in urinary bladder cancer treatment have been in use for more than 30 years and show reduced effectiveness and high recurrence rates. There have been several attempts to find new and more effective drugs, to be used alone or in combination with the drugs already in use, in order to overcome this situation.The biologically important mammalian target of rapamycin (mTOR) pathway is altered in cancer and mTOR inhibitors have raised many expectations as potentially important anticancer drugs. In this article, the authors will review the mTOR pathway and present their experiences of the use of some mTOR inhibitors, sirolimus, everolimus and temsirolimus, in isolation and in conjunction with non-mTOR inhibitors cisplatin and gemcitabine, on urinary bladder tumour cell lines. The non-muscle-invasive cell line, 5637, is the only one that exhibits a small alteration in the mTOR and AKT phosphorylation after rapalogs exposure. Also, there was a small inhibition of cell proliferation. With gemcitabine plus everolimus or temsirolimus, the results were encouraging as a more effective response was noticed with both combinations, especially in the 5637 and T24 cell lines. Cisplatin associated with everolimus or temsirolimus also gave promising results, as an antiproliferative effect was observed when the drugs were associated, in particular on the 5637 and HT1376 cell lines. Everolimus or temsirolimus in conjunction with gemcitabine or cisplatin could have an important role to play in urinary bladder cancer treatment, depending on the tumour grading.
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Affiliation(s)
- R Pinto-Leite
- Genetic Service, Cytogenetic Laboratory, Hospital Center of Trás-os-Montes and Alto Douro, Vila Real, Portugal. .,Experimental Pathology and Therapeutics Group, Portuguese Institute of Oncology, Porto, Portugal.
| | - R Arantes-Rodrigues
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), University of Trás-os-Montes and Alto Douro, Vila Real, Portugal.,QOPNA, Mass Spectrometry Center, Department of Chemistry, University of Aveiro, Aveiro, Portugal.,Institute for Research and Innovation in Health (I3S), Porto, Portugal
| | - Nuno Sousa
- Health School, University Fernando Pessoa, Porto, Portugal
| | - P A Oliveira
- Experimental Pathology and Therapeutics Group, Portuguese Institute of Oncology, Porto, Portugal
| | - L Santos
- Experimental Pathology and Therapeutics Group, Portuguese Institute of Oncology, Porto, Portugal.,Health School, University Fernando Pessoa, Porto, Portugal.,Medical Oncology Department, Portuguese Institute of Oncology, Porto, Portugal
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7
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Xie L, Huang J, Chen X, Yu H, Li K, Yang D, Chen X, Ying J, Pan F, Lv Y, Cheng Y. Synthesis of Rapamycin Derivatives Containing the Triazole Moiety Used as Potential mTOR-Targeted Anticancer Agents. Arch Pharm (Weinheim) 2016; 349:428-41. [DOI: 10.1002/ardp.201500457] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 04/06/2016] [Accepted: 04/11/2016] [Indexed: 01/06/2023]
Affiliation(s)
- Lijun Xie
- Fujian Provincial Key Laboratory of Screening for Novel Microbial Products; Fujian Institute of Microbiology; Changshang District Fuzhou P. R. China
| | - Jie Huang
- Fujian Provincial Key Laboratory of Screening for Novel Microbial Products; Fujian Institute of Microbiology; Changshang District Fuzhou P. R. China
| | - Xiaoming Chen
- Fujian Provincial Key Laboratory of Screening for Novel Microbial Products; Fujian Institute of Microbiology; Changshang District Fuzhou P. R. China
| | - Hui Yu
- Fujian Provincial Key Laboratory of Screening for Novel Microbial Products; Fujian Institute of Microbiology; Changshang District Fuzhou P. R. China
| | - Kualiang Li
- Fujian Provincial Key Laboratory of Screening for Novel Microbial Products; Fujian Institute of Microbiology; Changshang District Fuzhou P. R. China
| | - Dan Yang
- Fujian Provincial Key Laboratory of Screening for Novel Microbial Products; Fujian Institute of Microbiology; Changshang District Fuzhou P. R. China
| | - Xiaqin Chen
- Fujian Provincial Key Laboratory of Screening for Novel Microbial Products; Fujian Institute of Microbiology; Changshang District Fuzhou P. R. China
| | - Jiayin Ying
- Fujian Provincial Key Laboratory of Screening for Novel Microbial Products; Fujian Institute of Microbiology; Changshang District Fuzhou P. R. China
| | - Fusheng Pan
- Hangzhou Huadong Medicine Group Pharmaceutical Research Institute Co. Ltd.; Xihu District Hangzhou P. R. China
| | - Youbing Lv
- Hangzhou Huadong Medicine Group Pharmaceutical Research Institute Co. Ltd.; Xihu District Hangzhou P. R. China
| | - Yuanrong Cheng
- Fujian Provincial Key Laboratory of Screening for Novel Microbial Products; Fujian Institute of Microbiology; Changshang District Fuzhou P. R. China
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8
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Yu R, Yu BX, Chen JF, Lv XY, Yan ZJ, Cheng Y, Ma Q. Anti-tumor effects of Atractylenolide I on bladder cancer cells. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2016; 35:40. [PMID: 26931119 PMCID: PMC4774103 DOI: 10.1186/s13046-016-0312-4] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 02/23/2016] [Indexed: 12/12/2022]
Abstract
BACKGROUND Atractylenolide I (ATR-1), an active component of Rhizoma Atractylodis Macrocephalae, possesses cytotoxicity against various carcinomas. However, little is known about the effects of ATR-1on bladder cancer. In the present study, the anti-tumor activity of ATR-1 was examined on bladder cancer cells both in vivo and in vitro. METHODS MTT assay was used to assess the cytotoxic effect of ATR-1. Cell cycle distribution and apoptosis levels were evaluated using flow cytometry. Western blotting assay was applied to measure the levels of proteins associated with the apoptotic pathway, cell cycle progression and PI3K/Akt/mTOR signaling pathway. Tumor models in nude mice were induced by injection of T-24 and 253J human bladder cancer cells. RESULTS ATR-1 inhibited bladder cancer cell proliferation, arrested cell cycle in G2/M phase through up-regulation of p21 and down-regulation of cyclin B1, CDK1 and Cdc25c. Meanwhile, ATR-1 also triggered cellular apoptosis depending on the activation of mitochondrial apoptotic pathway. Mechanism investigation indicated that ATR-1 exerts its anti-tumor effect also relies on the inhibition of PI3K/Akt/mTOR signaling pathway. Finally, mice studies showed that ATR-1 blocked the T-24 or 253J-induced xenograft tumor growth without noticeable toxicity. CONCLUSIONS ATR-1 may be served as a potential therapeutic agent for the treatment of bladder cancer.
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Affiliation(s)
- Rui Yu
- Department of Biochemistry and Molecular Biology, Zhejiang Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Fenghua St., 315211, Ningbo, China
| | - Bi-Xia Yu
- Translational Research Laboratory for Urology, Ningbo First Hospital, The Affiliated Hospital of Ningbo University, Liuting St., 315010, Ningbo, China
| | - Jun-Feng Chen
- Translational Research Laboratory for Urology, Ningbo First Hospital, The Affiliated Hospital of Ningbo University, Liuting St., 315010, Ningbo, China
| | - Xiu-Yi Lv
- Translational Research Laboratory for Urology, Ningbo First Hospital, The Affiliated Hospital of Ningbo University, Liuting St., 315010, Ningbo, China
| | - Ze-Jun Yan
- Translational Research Laboratory for Urology, Ningbo First Hospital, The Affiliated Hospital of Ningbo University, Liuting St., 315010, Ningbo, China.,Department of Urology, Ningbo First Hospital, The Affiliated Hospital of Ningbo University, Liuting St., 315010, Ningbo, China
| | - Yue Cheng
- Translational Research Laboratory for Urology, Ningbo First Hospital, The Affiliated Hospital of Ningbo University, Liuting St., 315010, Ningbo, China. .,Department of Urology, Ningbo First Hospital, The Affiliated Hospital of Ningbo University, Liuting St., 315010, Ningbo, China.
| | - Qi Ma
- Translational Research Laboratory for Urology, Ningbo First Hospital, The Affiliated Hospital of Ningbo University, Liuting St., 315010, Ningbo, China. .,Department of Urology, Ningbo First Hospital, The Affiliated Hospital of Ningbo University, Liuting St., 315010, Ningbo, China.
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9
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Xie L, Huang J, Chen X, Yu H, Li K, Yang D, Chen X, Ying J, Pan F, Lv Y, Cheng Y. Design, Synthesis and Biological Evaluation of Novel Rapamycin Benzothiazole Hybrids as mTOR Targeted Anti-cancer Agents. Chem Pharm Bull (Tokyo) 2016; 64:346-55. [DOI: 10.1248/cpb.c15-01016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | | | | | - Hui Yu
- Fujian Institute of Microbiology
| | | | - Dan Yang
- Fujian Institute of Microbiology
| | | | | | - Fusheng Pan
- Hangzhou Huadong Medicine Group Pharmaceutical Research Institute Co., Ltd
| | - Youbing Lv
- Hangzhou Huadong Medicine Group Pharmaceutical Research Institute Co., Ltd
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10
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Kim SJ, Kim JH, Jung HS, Lee TJ, Lee KM, Chang IH. Phosphorylated p70S6K in noninvasive low-grade urothelial carcinoma of the bladder: correlation with tumor recurrence. Asian J Androl 2015; 16:611-7. [PMID: 24625880 PMCID: PMC4104092 DOI: 10.4103/1008-682x.123675] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
We investigated whether inhibiting phosphorylated p70S6K (p-p70S6K) suppresses the proliferation and growth of noninvasive low-grade urothelial carcinoma (LG-URCa) in vitro and whether p-p70S6K can serve as a predictive biomarker for the recurrence of noninvasive LG-URCa of the bladder in patients. We constructed a tissue microarray (TMA) for 95 LG-URCa and 35 benign urothelium samples and performed immunohistochemical staining for p-p70S6K and p-4E-BP1. A Cox regression model was used to investigate the predictive factors for recurrence of LG-URCa. We investigated the dose-dependent antiproliferative effect of rapamycin, its antiproliferative effect and the growth-inhibition effect of p70S6K siRNA transfection in RT4 and 253J cell lines. The pT1 staged group (P < 0.05; hazard ratio (HR), 2.415) and the high p-p70S6K staining group (P < 0.05; HR, 2.249) were independent factors for predicting recurrence. Rapamycin inhibited RT4 and 253J cell proliferation in a dose-dependent manner (r = −0.850, P < 0.001 in RT4 cells; r = −0.835, P < 0.001 in 253J cells). RT4 and 253J cell proliferation and growth were inhibited by the transfection of p70S6K siRNA and rapamycin, respectively (P < 0.05). Transfection of p70S6K siRNA resulted in inhibitory effects on cell proliferation and growth that were similar to those of rapamycin. Our results suggest that inhibiting p70S6K phosphorylation is important to prevent recurrence and that p70S6K phosphorylation can be used as a molecular biomarker to predict recurrence of certain LG-URCa of the bladder.
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Affiliation(s)
| | | | | | | | | | - In Ho Chang
- Department of Urology, Chung-Ang University College of Medicine, Korea
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11
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Afonso J, Longatto-Filho A, DA Silva VM, Amaro T, Santos LL. Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients. Oncol Lett 2014; 8:1447-1454. [PMID: 25202348 PMCID: PMC4156165 DOI: 10.3892/ol.2014.2392] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 06/24/2014] [Indexed: 12/28/2022] Open
Abstract
Urothelial bladder carcinoma (UBC) is heterogeneous in its pathology and clinical behaviour. Evaluation of prognostic and predictive biomarkers is necessary, in order to produce personalised treatment options. The present study used immunohistochemistry to evaluate UBC sections containing tumour and non-tumour areas from 76 patients, for the detection of p-mTOR, CD31 and D2-40 (blood and lymphatic vessels identification, respectively). Of the non-tumour and tumour sections, 36 and 20% were scored positive for p-mTOR expression, respectively. Immunoexpression was observed in umbrella cells from non-tumour urothelium, in all cell layers from non-muscle-invasive (NMI) tumours (including expression in superficial cells), and in spots of cells from muscle-invasive (MI) tumours. Positive expression decreased from non-tumour to tumour urothelium, and from pT1/pTis to pT3/pT4 tumours; however, the few pT3/pT4 positive cases had worse survival rates, with 5-year disease-free survival being significantly lower. Angiogenesis occurrence was impaired in pT3/pT4 tumours that did not express p-mTOR. In conclusion, p-mTOR expression in non-tumour umbrella cells is likely a reflection of their metabolic plasticity, and extension to the inner layers of the urothelium in NMI tumours is consistent with an enhanced malignant potential. The expression in cell spots in a few MI tumours and absence of expression in the remaining tumours is intriguing and requires further research. Additional studies regarding the up- and downstream effectors of the mTOR pathway should be conducted.
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Affiliation(s)
- Julieta Afonso
- Life and Health Sciences Research Institute (ICVS), School of Healh Sciences (ECS) University of Minho, Braga 4710-057, Portugal ; ICVS/3B's, PT Government Associate Laboratory, Braga 4710-057/Guimarães 4806-909, Portugal
| | - Adhemar Longatto-Filho
- Life and Health Sciences Research Institute (ICVS), School of Healh Sciences (ECS) University of Minho, Braga 4710-057, Portugal ; ICVS/3B's, PT Government Associate Laboratory, Braga 4710-057/Guimarães 4806-909, Portugal ; Laboratory of Medical Investigation (LIM 14), Faculty of Medicine, São Paulo State University, São Paulo 01246-000, Brazil ; Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, São Paulo 14784-400, Brazil
| | | | - Teresina Amaro
- Experimental Pathology and Therapeutics Research Center, Portuguese Institute of Oncology (IPO), Porto 4200-072, Portugal
| | - Lúcio L Santos
- Department of Surgical Oncology, Portuguese Institute of Oncology (IPO), Porto 4200-072, Portugal ; Faculty of Health Sciences, University Fernando Pessoa, Porto 4200-150, Portugal
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12
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Moon DG, Lee SE, Oh MM, Lee SC, Jeong SJ, Hong SK, Yoon CY, Byun SS, Park HS, Cheon J. NVP-BEZ235, a dual PI3K/mTOR inhibitor synergistically potentiates the antitumor effects of cisplatin in bladder cancer cells. Int J Oncol 2014; 45:1027-35. [PMID: 24969552 PMCID: PMC4121414 DOI: 10.3892/ijo.2014.2505] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Accepted: 05/19/2014] [Indexed: 11/28/2022] Open
Abstract
The PI3K/Akt/mTOR pathway is a prototypic survival pathway and constitutively activated in many malignant conditions. Moreover, activation of the PI3K/Akt/mTOR pathway confers resistance to various cancer therapies and is often associated with a poor prognosis. In this study, we explored the antitumor effect of NVP-BEZ235, a dual PI3K/mTOR inhibitor in cisplatin-resistant human bladder cancer cells and its synergistic interaction with cisplatin. A human bladder cancer cell line with cisplatin resistance was exposed to escalating doses of NVP-BEZ235 alone or in combination with cisplatin and antitumor effects was determined by the CCK-8 assay. Based on a dose-response study, synergistic interaction between NVP-BEZ235 and cisplatin was evaluated by combination index (CI), three-dimensional model and clonogenic assay. The combination of NVP-BEZ235 and cisplatin caused significant synergistic antitumor effect in cisplatin-resistant bladder cancer cells over a wide dose range and reduced the IC50 of NVP-BEZ235 and cisplatin by 5.6- and 3.6-fold, respectively. Three-dimensional synergy analysis resulted in a synergy volume of 388.25 μM/ml2% indicating a strong synergistic effect of combination therapy. The combination therapy caused cell cycle arrest and caspase-dependent apoptosis. Although NVP-BEZ235 suppressed PI3K/mTOR signaling without any paradoxical induction of Akt activity, it caused MEK/ERK pathway activation. The present study demonstrated that the PI3K/mTOR dual inhibitor NVP-BEZ235 can synergistically potentiate the antitumor effects of cisplatin in cisplatin-resistant bladder cancer cells though the suppression of cell cycle progression and the survival pathway as well as induction of caspase-dependent apoptosis.
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Affiliation(s)
- Du G Moon
- Department of Urology, College of Medicine, Korea University, Guro Hospital, Seoul, Republic of Korea
| | - Sang E Lee
- Department of Urology, School of Medicine, Seoul National University, Bundang Hospital, Gyeonggi‑do, Seoul, Republic of Korea
| | - Mi M Oh
- Department of Urology, College of Medicine, Korea University, Guro Hospital, Seoul, Republic of Korea
| | - Sang C Lee
- Department of Urology, School of Medicine, Seoul National University, Bundang Hospital, Gyeonggi‑do, Seoul, Republic of Korea
| | - Seong J Jeong
- Department of Urology, School of Medicine, Seoul National University, Bundang Hospital, Gyeonggi‑do, Seoul, Republic of Korea
| | - Sung K Hong
- Department of Urology, School of Medicine, Seoul National University, Bundang Hospital, Gyeonggi‑do, Seoul, Republic of Korea
| | - Cheol Y Yoon
- Department of Urology, College of Medicine, Korea University, Guro Hospital, Seoul, Republic of Korea
| | - Seok S Byun
- Department of Urology, School of Medicine, Seoul National University, Bundang Hospital, Gyeonggi‑do, Seoul, Republic of Korea
| | - Hong S Park
- Department of Urology, College of Medicine, Korea University, Guro Hospital, Seoul, Republic of Korea
| | - Jun Cheon
- Department of Urology, College of Medicine, Korea University, Anam Hospital, Seoul, Republic of Korea
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13
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Dual inhibition by S6K1 and Elf4E is essential for controlling cellular growth and invasion in bladder cancer. Urol Oncol 2014; 32:51.e27-35. [DOI: 10.1016/j.urolonc.2013.08.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Revised: 08/09/2013] [Accepted: 08/12/2013] [Indexed: 11/17/2022]
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Zhang T, Guo P, Zhang Y, Xiong H, Yu X, Xu S, Wang X, He D, Jin X. The antidiabetic drug metformin inhibits the proliferation of bladder cancer cells in vitro and in vivo. Int J Mol Sci 2013; 14:24603-18. [PMID: 24351837 PMCID: PMC3876131 DOI: 10.3390/ijms141224603] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 11/21/2013] [Accepted: 12/04/2013] [Indexed: 01/03/2023] Open
Abstract
Recent studies suggest that metformin, a widely used antidiabetic agent, may reduce cancer risk and improve prognosis of certain malignancies. However, the mechanisms for the anti-cancer effects of metformin remain uncertain. In this study, we investigated the effects of metformin on human bladder cancer cells and the underlying mechanisms. Metformin significantly inhibited the proliferation and colony formation of 5637 and T24 cells in vitro; specifically, metformin induced an apparent cell cycle arrest in G0/G1 phases, accompanied by a strong decrease of cyclin D1, cyclin-dependent kinase 4 (CDK4), E2F1 and an increase of p21waf-1. Further experiments revealed that metformin activated AMP-activated protein kinase (AMPK) and suppressed mammalian target of rapamycin (mTOR), the central regulator of protein synthesis and cell growth. Moreover, daily treatment of metformin led to a substantial inhibition of tumor growth in a xenograft model with concomitant decrease in the expression of proliferating cell nuclear antigen (PCNA), cyclin D1 and p-mTOR. The in vitro and in vivo results demonstrate that metformin efficiently suppresses the proliferation of bladder cancer cells and suggest that metformin may be a potential therapeutic agent for the treatment of bladder cancer.
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Affiliation(s)
- Tao Zhang
- Minimally Invasive Urology Center, Provincial Hospital Affiliated to Shandong University, Jinan 250021, China; E-Mails: (T.Z.); (Y.Z.); (H.X.); (X.Y.)
| | - Peng Guo
- Department of Urology, the First Hospital of Xi’an Jiaotong University, Xi’an 710061, China; E-Mails: (P.G.); (S.X.); (X.W.)
- Oncology Research Laboratory, Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University, Xi’an 710061, China
| | - Yinan Zhang
- Minimally Invasive Urology Center, Provincial Hospital Affiliated to Shandong University, Jinan 250021, China; E-Mails: (T.Z.); (Y.Z.); (H.X.); (X.Y.)
| | - Hui Xiong
- Minimally Invasive Urology Center, Provincial Hospital Affiliated to Shandong University, Jinan 250021, China; E-Mails: (T.Z.); (Y.Z.); (H.X.); (X.Y.)
| | - Xiao Yu
- Minimally Invasive Urology Center, Provincial Hospital Affiliated to Shandong University, Jinan 250021, China; E-Mails: (T.Z.); (Y.Z.); (H.X.); (X.Y.)
| | - Shan Xu
- Department of Urology, the First Hospital of Xi’an Jiaotong University, Xi’an 710061, China; E-Mails: (P.G.); (S.X.); (X.W.)
- Oncology Research Laboratory, Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University, Xi’an 710061, China
| | - Xinyang Wang
- Department of Urology, the First Hospital of Xi’an Jiaotong University, Xi’an 710061, China; E-Mails: (P.G.); (S.X.); (X.W.)
- Oncology Research Laboratory, Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University, Xi’an 710061, China
| | - Dalin He
- Department of Urology, the First Hospital of Xi’an Jiaotong University, Xi’an 710061, China; E-Mails: (P.G.); (S.X.); (X.W.)
- Oncology Research Laboratory, Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University, Xi’an 710061, China
- Authors to whom correspondence should be addressed; E-Mails: (D.H.); (X.J.); Tel.: +86-29-8532-3661 (D.H.); +86-138-0892-7088 (X.J.); Fax: +86-29-8532-3203 (D.H.); +86-531-8706-8707 (X.J.)
| | - Xunbo Jin
- Minimally Invasive Urology Center, Provincial Hospital Affiliated to Shandong University, Jinan 250021, China; E-Mails: (T.Z.); (Y.Z.); (H.X.); (X.Y.)
- Authors to whom correspondence should be addressed; E-Mails: (D.H.); (X.J.); Tel.: +86-29-8532-3661 (D.H.); +86-138-0892-7088 (X.J.); Fax: +86-29-8532-3203 (D.H.); +86-531-8706-8707 (X.J.)
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Cheng PH, Lian S, Zhao R, Rao XM, McMasters KM, Zhou HS. Combination of autophagy inducer rapamycin and oncolytic adenovirus improves antitumor effect in cancer cells. Virol J 2013; 10:293. [PMID: 24059864 PMCID: PMC3850263 DOI: 10.1186/1743-422x-10-293] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Accepted: 08/21/2013] [Indexed: 02/07/2023] Open
Abstract
Background Combination of oncolytic adenoviruses (Ads) and chemotherapy drugs has shown promising therapeutic results and is considered as a potential approach for cancer therapy. We previously have shown that autophagy may generate decomposed cellular molecules that can be used as nutrition to support virus replication in cancer cells. In this study, we evaluated a unique combination of the novel oncolytic Ad-cycE with rapamycin, an autophagy inducer and first-line chemotherapeutic drug. Methods The combination of oncolytic Ad-cycE and the autophagy inducer rapamycin was assessed for enhanced antitumor effect. We also evaluated the combined effects of rapamycin and Ad-cycE on cancer cell viability. The interaction between Ad-cycE and rapamycin was analyzed with Calcusyn (Biosoft, Ferguson, MO). Results We show that rapamycin induces autophagy, enhances Ad E1A expression and increases Ad oncolytic replication. Combination of rapamycin and Ad-cycE elicits stronger cytotoxicity than single treatment alone. The analyzed data indicates that the Ad-cycE and rapamycin combination has a significantly synergistic antitumor effect. Conclusions Our study provides a new insight into vector development and demonstrates the novel roles of autophagy in adenovirus replication. The combination of autophagy-induced chemotherapy and oncolytic virotherapy may be a new approach to improve future cancer treatment.
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Affiliation(s)
- Pei-Hsin Cheng
- Department of Surgery, University of Louisville School of Medicine, Louisville, KY 40292, USA.
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16
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Temsirolimus improves cytotoxic efficacy of cisplatin and gemcitabine against urinary bladder cancer cell lines. Urol Oncol 2013; 32:41.e11-22. [PMID: 24035472 DOI: 10.1016/j.urolonc.2013.04.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Revised: 04/25/2013] [Accepted: 04/26/2013] [Indexed: 12/26/2022]
Abstract
OBJECTIVES To analyze the cytotoxic action of temsirolimus using 3 established human bladder cancer cell lines and to assess whether temsirolimus potentiates the anticancer activity of gemcitabine and cisplatin. METHODS Temsirolimus (500, 1,000, 2,000, and 4,000 nM), in isolation, and combined with gemcitabine (100 nM) and cisplatin (2.5 µg/ml), was given to 5637, T24, and HT1376 bladder cancer cell lines. Cell proliferation, autophagy, early apoptosis, and cell cycle distribution were analyzed after a 72-hour period. The expression of mammalian target of rapamycin baseline, Akt, and their phosphorylated forms, before and after treatment with temsirolimus, was evaluated by immunoblotting. RESULTS Temsirolimus slightly decreased the bladder cancer cell proliferation in all 3 cell lines. No significant differences in the expression of mammalian target of rapamycin, Akt, and their phosphorylated forms because of temsirolimus exposure were found in the 3 cell lines. As part of a combined regime along with gemcitabine, and especially with cisplatin, there was a more pronounced antiproliferative effect. This pattern of response was similar to the other parameters analyzed (increased autophagy and apoptosis). Also, in the combined regime, an enhanced cell cycle arrest in the G0/G1 phase was observed. The non-muscle invasive 5637 bladder cancer cell line was most sensitive to both combinations. CONCLUSIONS Temsirolimus makes a moderate contribution in terms of cell proliferation, apoptosis, and autophagy. However, it does potentiate the activity of gemcitabine and particularly cisplatin. Therefore, cisplatin- or gemcitabine-based chemotherapy regimen used in combination with temsirolimus to treat bladder cancer represents a novel and valuable treatment option, which should be tested for future studies in urinary bladder xenograft models.
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Wu MJ, Chang CH, Chiu YT, Wen MC, Shu KH, Li JR, Chiu KY, Chen YT. Rictor-dependent AKT activation and inhibition of urothelial carcinoma by rapamycin. Urol Oncol 2012; 30:69-77. [DOI: 10.1016/j.urolonc.2009.11.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2009] [Revised: 11/08/2009] [Accepted: 11/10/2009] [Indexed: 11/27/2022]
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Pinto-Leite R, Arantes-Rodrigues R, Palmeira C, Gaivão I, Cardoso ML, Colaço A, Santos L, Oliveira P. Everolimus enhances gemcitabine-induced cytotoxicity in bladder-cancer cell lines. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2012; 75:788-799. [PMID: 22788366 DOI: 10.1080/15287394.2012.690325] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The purpose of this study was to determine whether everolimus, a rapamycin derivative, might significantly enhance the cytotoxicity of gemcitabine, an antitumor drug, in two human bladder-cancer cell lines. Human bladder-cancer T24 and 5637 cells were incubated with gemcitabine and everolimus in a range of concentrations either alone or in combination for 72 h. Flow cytometry, comet assay, MTT method and optical microscopy were used to assess cell proliferation, cell cycle, DNA damage, and morphological alterations. Gemcitabine exerted an inhibitory effect on T24 and 5637 cell proliferation, in a concentration-dependent manner. Everolimus significantly reduced proliferation of 5637 bladder cancer cells (IC₃₀) at 1 μM), whereas T24 demonstrated marked resistance to everolimus treatment. A significant antiproliferative effect was obtained combining gemcitabine (100 nM) with everolimus (0.05-2 μM) with an arrest of cell cycle at S phase. Furthermore, an increase in frequency of DNA damage, apoptotic bodies, and apoptotic cells was observed when T24 and 5637 cancer cells were treated simultaneously with both drugs. Data show that in vitro combination produced a more potent antiproliferative effect when compared with single drugs.
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Affiliation(s)
- Rosário Pinto-Leite
- Genetic Service, Cytogenetic Laboratory, Hospital Center of Trás-os-Montes and Alto Douro, Vila Real, Portugal
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19
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Vasconcelos-Nóbrega C, Pinto-Leite R, Arantes-Rodrigues R, Ferreira R, Brochado P, Cardoso ML, Palmeira C, Salvador A, Guedes-Teixeira CI, Colaço A, Palomino LF, Lopes C, Santos L, Oliveira PA. In vivo and in vitro effects of RAD001 on bladder cancer. Urol Oncol 2011; 31:1212-21. [PMID: 22169072 DOI: 10.1016/j.urolonc.2011.11.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 10/24/2011] [Accepted: 11/02/2011] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To evaluate the influence of Everolimus (RAD001) on chemically induced urothelial lesions in mice and its influence on in vitro human bladder cancer cell lines. METHODS ICR male mice were given N-butyl-N-(4-hydroxybutyl) nitrosamine in drinking water for a period of 12 weeks. Subsequently, RAD001 was administered via oral gavage, for 6 weeks. At the end of the experiment, all the animals were sacrificed and tumor development was determined by means of histopathologic evaluation; mammalian target of rapamycin (mTOR) expressivity was evaluated by immunohistochemistry. Three human bladder cancer cell lines (T24, HT1376, and 5637) were treated using a range of RAD001 concentrations. MTT assay, terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL), and flow cytometry were used to assess cell proliferation, apoptosis index, and cell cycle analysis, respectively. Immunoblotting analysis of 3 cell line extracts using mTOR and Akt antibodies was performed in order to study the expression of Akt and mTOR proteins and their phosphorylated forms. RESULTS The incidence of urothelial lesions in animals treated with RAD001 was similar to those animals not treated. RAD001 did not block T24 and HT1376 cell proliferation or induce apoptosis. A reduction in cell proliferation rate and therefore G0/G1 phase arrest, as well as a statistically significant induction of apoptosis (P = 0.001), was only observed in the 5637 cell line. CONCLUSION RAD001 seems not to have a significant effect on chemically induced murine bladder tumors. The effect of RAD001 on tumor proliferation and apoptosis was achieved only in superficial derived bladder cancer cell line, no effect was observed in invasive cell lines.
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Park SJ, Lee TJ, Chang IH. Role of the mTOR Pathway in the Progression and Recurrence of Bladder Cancer: An Immunohistochemical Tissue Microarray Study. Korean J Urol 2011; 52:466-73. [PMID: 21860767 PMCID: PMC3151634 DOI: 10.4111/kju.2011.52.7.466] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Accepted: 06/28/2011] [Indexed: 11/28/2022] Open
Abstract
Purpose Numerous trials have been conducted to develop new treatment regimens for superficial and invasive bladder cancer, because there is an urgent need to identify novel agents to prevent the recurrence and progression of these cancers. We evaluated the prognostic and biological significance of mTOR pathway-related markers in patients with bladder cancer who had undergone transurethral resection of their bladder tumors and radical cystectomy. Materials and Methods We retrieved 208 bladder cancer specimens collected from patients between 1989 and 2007 and constructed a tissue microarray comprising 208 tumor samples and 25 benign urothelium samples. Immunohistochemical staining was performed for mTOR, phosphorylated (phos) S6, and phos4E-BP1. The pattern, percentage, and intensity of staining for all three markers were evaluated. Results The median age at diagnosis of the patient cohort was 67 years (range: 29-87 years), and the median follow-up was 72 months (range: 1-257 months). The expression of phos4E-BP1 was higher in the bladder cancer cohort than in the benign cohort, whereas phosS6 expression was lower in the bladder cancer cohort than in the benign cohort. The expression of phosS6 was significantly higher in high-grade bladder cancer (p<0.01). There was a significant positive correlation between the H-scores of mTOR and phos4E-BP1 (coefficient of correlation, r=0.37, p<0.01) as well as between the H-scores of mTOR and phosS6 (r=0.17, p<0.05). In the multivariate analysis, strong phosS6 expression predicted shorter progression (p<0.01; hazard ratio [HR], 2.516) and disease-specific survival (p<0.01; HR, 2.396) but not overall survival (p=0.112), whereas strong phos4E-BP1 expression was a predictor of disease-specific survival (p<0.05; HR, 2.105). Moreover, strong phosS6 expression predicted shorter recurrence-free (p<0.05) and progression-free (p<0.05) survival in the superficial bladder cancer cohort. Conclusions Our results demonstrate that mTOR pathway activation, as assessed by phos4E-BP1 phosphorylation, is related to bladder cancer tumorigenesis and that S6 protein phosphorylation is associated with a high level of disease recurrence and progression and poor cancer-specific survival.
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Affiliation(s)
- Se Jun Park
- Department of Urology, Chung-Ang University College of Medicine, Seoul, Korea
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Makhlin I, Zhang J, Long CJ, Devarajan K, Zhou Y, Klein-Szanto AJ, Huang M, Chernoff J, Boorjian SA. The mTOR pathway affects proliferation and chemosensitivity of urothelial carcinoma cells and is upregulated in a subset of human bladder cancers. BJU Int 2010; 108:E84-90. [PMID: 21050361 DOI: 10.1111/j.1464-410x.2010.09844.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
OBJECTIVE To investigate whether mammalian target of rapamycin (mTOR) inhibition by rapamycin is therapeutically efficacious in combination with cisplatin for bladder cancer. MATERIALS AND METHODS Using a panel of human urothelial carcinoma cell lines, we determined the effect of rapamycin on cell viability, cell-cycle progression, signalling and apoptosis. The effect of mTOR inhibition on chemosensitivity was investigated by treating cells with rapamycin, alone, or with cisplatin. The effect of rapamycin or cisplatin treatment was assessed in xenograft mice inoculated with urothelial carcinoma cells. Expression of p-mTOR in human bladder cancer specimens was assessed using a tissue microarray. RESULTS Treatment with rapamycin significantly decreased cell viability in UMUC3 (P = 0.004) and 253J (P < 0.001) cells. It induced arrest in the G(0) -G(1) phase and decreased activation of p-mTOR and its downstream effector, p-S6K, in both cell lines. Treatment with rapamycin increased the ability of cisplatin to inhibit cell viability in UMUC3 (P = 0.002) and 253J (P = 0.03) cells. No evidence for apoptosis induction was noted after treatment with rapamycin alone. Mouse xenografts of UMUC3 cells revealed that rapamycin significantly prolonged survival and enhanced the therapeutic efficacy of cisplatin. In patient urothelial carcinoma specimens, p-mTOR expression was increased in cancer vs non-tumour bladder tissue in 65/203 (32.0%) tumours. CONCLUSIONS mTOR blockade inhibits urothelial carcinoma cell proliferation and enhances the effectiveness of cisplatin. Suppression of the mTOR pathway has the potential to be a therapeutic target in bladder cancer for selected patients.
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Affiliation(s)
- Igor Makhlin
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, USA
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