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Nakai K, Endo K, Yoshida F, Koka M, Yamada N, Satoh T, Tsurubuchi T, Matsumura A, Matsumoto Y, Sakurai H. Boron analysis and imaging of cells with 2-hr BPA exposure by using micro-proton particle-induced gamma-ray emission (PIGE). Appl Radiat Isot 2020; 165:109334. [PMID: 32739796 DOI: 10.1016/j.apradiso.2020.109334] [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: 08/31/2019] [Revised: 07/05/2020] [Accepted: 07/08/2020] [Indexed: 10/23/2022]
Abstract
Particle-induced gamma-ray emission (PIGE), which measures prompt gamma rays at 428 keV from 10B (p, p'γ) 7Be, was used to confirm the boron distribution within 2hr-BPA-exposed cells. Distribution images of potassium, phosphate, and boron and the whole spectrum showed the ratios of boron counts to total (%) as follows: control group: 1.35 ± 0.073%; 2hr boron exposure group: 2.33 ± 0.35%; and boron exposure/wash group: 1.58 ± 0.095%. Micro-beam PIXE/PIGE can be a promising tool for visualization of intracellular Boron.
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Affiliation(s)
- Kei Nakai
- Ibaraki Prefectural University of Health Sciences, 4669-2 Ami, Inashiki, Ibaraki, 300-0331, Japan; Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan; Department of Radiation Oncology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
| | - Keita Endo
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan
| | - Fumiyo Yoshida
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan
| | - Masashi Koka
- Takasaki Advanced Radiation Research Institute, National Institute for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma, 370-1292, Japan
| | - Naoto Yamada
- Takasaki Advanced Radiation Research Institute, National Institute for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma, 370-1292, Japan
| | - Takahiro Satoh
- Takasaki Advanced Radiation Research Institute, National Institute for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma, 370-1292, Japan
| | - Takao Tsurubuchi
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
| | - Akira Matsumura
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan
| | - Yoshitaka Matsumoto
- Department of Radiation Oncology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan
| | - Hideyuki Sakurai
- Department of Radiation Oncology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan
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Liu Y, Duan L, Tian J, Song D, Zhang M, Zhao S, Yin Z, Xiang X, Li X. Role of the Akt/mTOR signaling pathway in human papillomavirus-associated nasal and sinonasal inverted papilloma. Acta Biochim Biophys Sin (Shanghai) 2017; 49:1067-1074. [PMID: 29040365 DOI: 10.1093/abbs/gmx108] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Indexed: 11/12/2022] Open
Abstract
Nasal and sinonasal inverted papilloma (NSIP) is a benign tumor in which surface epithelial cells grow downward into the underlying supportive tissue with varying degrees of metaplasia. Human papillomavirus (HPV) has been proposed as the causal agent in the pathogenesis of this disease. Many studies have shown that HPV can activate the Akt/mechanistic target of rapamycin (mTOR) signaling pathway, but the role of this pathway in HPV-associated NSIP is largely unknown. In this study, we enrolled 40 control tissue samples and 80 NSIP tissue samples. HPV genotyping showed that 47 of the 80 examined cases of NSIP were HPV-positive (58.8%), and the most common subtype was HPV11 (20/53, 37.7%). The immunohistochemistry showed statistically significant differences in phosphorylated Akt and phosphorylated S6 ribosomal protein staining among control samples, HPV-positive NSIP and HPV-negative NSIP. The HPV11 L1-L2 plasmid increased the proliferation of normal human nasopharyngeal epithelial NP69-SV40T cells and human nasopharyngeal cancer CNE1 cells. Meanwhile, rapamycin, an mTOR inhibitor, reversed the increased cell proliferation induced by the HPV11 L1-L2 plasmid. Western blot analysis showed that Akt/mTOR/S6 were overexpressed in NP69-SV40T cells and CNE1 cells infected with the HPV11 L1-L2 plasmid. These data demonstrate that HPV promotes cell proliferation through the Akt/mTOR signaling pathway in NSIP.
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Affiliation(s)
- Yongliang Liu
- Department of Otolaryngolgogy, Qilu Hospital of Shandong University, Jinan, China
- Department of Otolaryngolgogy, Zibo Central Hospital affiliated to Shandong University, Zibo, China
| | - Lihua Duan
- Department of Otolaryngolgogy, Zibo Central Hospital affiliated to Shandong University, Zibo, China
| | - Jie Tian
- Department of Otolaryngolgogy, Zibo Central Hospital affiliated to Shandong University, Zibo, China
| | - Daoliang Song
- Department of Otolaryngolgogy, Zibo Central Hospital affiliated to Shandong University, Zibo, China
| | - Min Zhang
- Department of Otolaryngolgogy, Zibo Central Hospital affiliated to Shandong University, Zibo, China
| | - Shenlin Zhao
- Department of Otolaryngolgogy, Zibo Central Hospital affiliated to Shandong University, Zibo, China
| | - Zhaofu Yin
- Department of Otolaryngolgogy, Zibo Central Hospital affiliated to Shandong University, Zibo, China
| | - Xinxin Xiang
- Central of Translation Medicine, Zibo Central Hospital affiliated to Shandong University, Zibo, China
| | - Xuezhong Li
- Department of Otolaryngolgogy, Qilu Hospital of Shandong University, Jinan, China
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Nakai K, Yamamoto Y, Okamoto E, Yamamoto T, Yoshida F, Matsumura A, Yamada N, Kitamura A, Koka M, Satoh T. Boron analysis for neutron capture therapy using particle-induced gamma-ray emission. Appl Radiat Isot 2015; 106:166-70. [PMID: 26242558 DOI: 10.1016/j.apradiso.2015.07.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 06/23/2015] [Accepted: 07/25/2015] [Indexed: 10/23/2022]
Abstract
The neutron source of BNCT is currently changing from reactor to accelerator, but peripheral facilities such as a dose-planning system and blood boron analysis have still not been established. To evaluate the potential application of particle-induced gamma-ray emission (PIGE) for boron measurement in clinical boron neutron capture therapy, boronophenylalanine dissolved within a cell culture medium was measured using PIGE. PIGE detected 18 μgB/mL f-BPA in the culture medium, and all measurements of any given sample were taken within 20 min. Two hours of f-BPA exposure was required to create a boron distribution image. However, even though boron remained in the cells, the boron on the cell membrane could not be distinguished from the boron in the cytoplasm.
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Affiliation(s)
- Kei Nakai
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan.
| | - Yohei Yamamoto
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Emiko Okamoto
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan; Master's Program in Medical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Tetsuya Yamamoto
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Fumiyo Yoshida
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Akira Matsumura
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Naoto Yamada
- Department of Advanced Radiation Technology, Takasaki Advanced Radiation Research Institute (TIARA), Japan Atomic Energy Agency (JAEA), 1233 Watanuki, Takasaki, Gunma 379-1292, Japan
| | - Akane Kitamura
- Department of Advanced Radiation Technology, Takasaki Advanced Radiation Research Institute (TIARA), Japan Atomic Energy Agency (JAEA), 1233 Watanuki, Takasaki, Gunma 379-1292, Japan
| | - Masashi Koka
- Department of Advanced Radiation Technology, Takasaki Advanced Radiation Research Institute (TIARA), Japan Atomic Energy Agency (JAEA), 1233 Watanuki, Takasaki, Gunma 379-1292, Japan
| | - Takahiro Satoh
- Department of Advanced Radiation Technology, Takasaki Advanced Radiation Research Institute (TIARA), Japan Atomic Energy Agency (JAEA), 1233 Watanuki, Takasaki, Gunma 379-1292, Japan
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Chino H, Hagiwara E, Sugisaki M, Baba T, Koga Y, Hisada T, Kaira K, Okudela K, Takemura T, Dobashi K, Ogura T. Pulmonary Aluminosis Diagnosed with In-air Microparticle Induced X-ray Emission Analysis of Particles. Intern Med 2015; 54:2035-40. [PMID: 26278298 DOI: 10.2169/internalmedicine.54.4246] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We herein present a case of pulmonary aluminosis diagnosed with in-air microparticle induced X-ray emission (in-air micro-PIXE) analysis. The diagnosis of pulmonary aluminosis was supported by the occupational exposure to aluminum, ground glass opacity and ill-defined centrilobular nodular opacities seen in high resolution CT, and respiratory bronchioles accompanied by pigmented dust by histological examination by in-air micro-PIXE analysis of the lung tissues. The possibility of developing this rare condition should not be underestimated in workers at high-risk jobs. This is an important report showing the usefulness of an in-air micro-PIXE analysis for the early diagnosis of aluminosis.
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Affiliation(s)
- Haruka Chino
- Department of Respiratory Medicine, Kanagawa Cardiovascular and Respiratory Center, Japan
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Yamamoto Y, Yamamoto T, Horiguchi Y, Shirakawa M, Satoh T, Koka M, Nagasaki Y, Nakai K, Matsumura A. Intra-tumor distribution of metallofullerene using micro-particle induced X-ray emission (PIXE). Appl Radiat Isot 2014; 88:114-7. [DOI: 10.1016/j.apradiso.2013.12.037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2013] [Revised: 12/27/2013] [Accepted: 12/27/2013] [Indexed: 11/28/2022]
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Mehta R, Chandler-Brown D, Ramos FJ, Shamieh LS, Kaeberlein M. Regulation of mRNA translation as a conserved mechanism of longevity control. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2010; 694:14-29. [PMID: 20886753 DOI: 10.1007/978-1-4419-7002-2_2] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Appropriate regulation of mRNA translation is essential for growth and survival and the pathways that regulate mRNA translation have been highly conserved throughout eukaryotic evolution. Translation is controlled by a complex set of mechanisms acting at multiple levels, ranging from global protein synthesis to individual mRNAs. Recently, several mutations that perturb regulation of mRNA translation have also been found to increase longevity in three model organisms: the buddingyeast Saccharomyces cerevisiae, the nematode Caenorhabditis elegans and the fruit fly Drosophila melanogaster. Many of these translation control factors can be mapped to a single pathway downstream of the nutrient responsive target of rapamycin (TOR) kinase. In this chapter, we will review the data suggesting that mRNA translation is an evolutionarily conserved modifier of longevity and discuss potential mechanisms by which mRNA translation could influence aging and age-associated disease in different species.
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Affiliation(s)
- Ranjana Mehta
- Department of Pathology, University of Washington, Seattle, Washington, USA
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Abstract
A complex equilibrium of biological signals exists within the human body to regulate normal cellular function and growth. Unfortunately, there are various ways in which disruption of these signaling pathways can result in uncontrollable cell growth--an important element in oncogenesis. In particular, the mammalian target of rapamycin (mTOR) pathway appears to play a central role in the development of multiple cancers, including urothelial cell carcinoma (UCC). Although often called 'a master regulator,' mTOR is but one signal in an intricate signaling cascade that controls cell growth and angiogenesis in both normal and cancerous conditions. Other important factors in this pathway include upstream activators such as phosphatidylinositol 3 kinase (PI3K) and Akt, negative regulators such as the tuberous sclerosis complex (TSC) 1/2, and downstream effectors such as p70 S6 kinase and eukaryotic initiation factor eIF4E. On the basis of its important role in tumor growth, efforts have focused on developing means to effectively target the mTOR pathway in hopes of designing new treatments for various tumor types. To address the role of mTOR pathway activity in UCC, we will first review the basic elements of the PI3K/Akt/mTOR pathway and then apply this pathway to bladder cancer oncogenesis. As will be evident, significant progress has been made in defining the role of this pathway in UCC; however, continued research into the nuances of pathway regulation and the usage of targeted inhibition in bladder cancer patients is necessary to define mTOR as a promising target in this disease.
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Kim MK, Kim TJ, Sung CO, Choi CH, Lee JW, Kim BG, Bae DS. High expression of mTOR is associated with radiation resistance in cervical cancer. J Gynecol Oncol 2010; 21:181-5. [PMID: 20922141 DOI: 10.3802/jgo.2010.21.3.181] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2010] [Revised: 06/16/2010] [Accepted: 06/30/2010] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVE Mammalian target of rapamycin (mTOR) is known to promote cell proliferation, survival, and resistance to radiation. The aim of this study was to determine whether mTOR expression was associated with survival and the response to radiation in patients with cervical cancer. METHODS After reviewing 119 patients treated by primary radiotherapy for stage IIB-IVA cervical cancer, a case-control study was performed. The cases (n=12) with local recurrence or radiation failure after primary radiation therapy were selected. For each case, two controls that had no recurrence were selected. Using pretreatment paraffin-embedded tissues, the cytoplasmic expression of phosphorylated-mTOR (p-mTOR) was evaluated by immunohistochemistry. Staining was scored based on intensity (intensity score [IS] 0-3) and proportion (proportion score [PS] 0-100). The progression free survival (PFS) was defined from the end of treatment to the day of recurrence by imaging studies or biopsy. The staining distribution and PFS were compared between the two groups. The results were analyzed by the Student t-test, Mann-Whitney U-test, Fisher's exact test, and Cox proportional hazards regression model. RESULTS The p-mTOR cytoplasmic expression was significantly associated with a poor response to radiotherapy (p<0.01). With respect to survival, a higher cytoplasmic expression of p-mTOR was associated with a worse outcome (p=0.02). The hazard ratio for recurrence or radiation failure was 6.18 for mTOR IS and 1.04 for mTOR PS (p<0.05 for both), indicating that the degree of p-mTOR staining correlated with the recurrence risk. CONCLUSION High expression of p-mTOR was associated with radiation resistance; therefore p-mTOR may be a prognostic marker for response to radiotherapy in patients with cervical cancer.
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Affiliation(s)
- Min-Kyu Kim
- Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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Watari H, Kanuma T, Ohta Y, Hassan MK, Mitamura T, Hosaka M, Minegishi T, Sakuragi N. Clusterin expression inversely correlates with chemosensitivity and predicts poor survival in patients with locally advanced cervical cancer treated with cisplatin-based neoadjuvant chemotherapy and radical hysterectomy. Pathol Oncol Res 2010; 16:345-52. [PMID: 20058210 DOI: 10.1007/s12253-009-9235-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2009] [Accepted: 12/01/2009] [Indexed: 12/24/2022]
Abstract
Overexpression of clusterin, an antiapoptotic molecule, has been reported to induce resistance to chemotherapy in a variety of cancer cell types. The aim of this study was to evaluate the significance of clusterin expression to predict response to platinum-based neoadjuvant chemotherapy and survival of patients with invasive cervical cancer who subsequently underwent radical hysterectomy. Biopsy specimens of invasive cervical cancer before neoadjuvant chemotherapy were obtained from 46 patients who subsequently underwent radical hysterectomy at Hokkaido University Hospital and Gunma University Hospital from 1994 to 2007. The expression of clusterin protein was analyzed by immunohistochemistry. Findings were evaluated in relation to several clinicopathological factors. Survival analyses were performed by the Kaplan-Meier curves and the log-rank test. Independent prognostic factors were determined by multivariate Cox regression analysis. Clusterin protein was mainly present in the cytoplasm of cervical cancer cells. The expression of clusterin protein in cervical cancer tissues before neoadjuvant chemotherapy was significantly related to poor response to chemotherapy among factors analyzed. Univariate analysis on prognostic factors showed that response to chemotherapy (p = 0.01), lymph node metastasis (p = 0.02), and clusterin expression (p = 0.02) were related to survival. Multivariate analysis revealed that lymph node metastasis (p = 0.03), and clusterin expression (p = 0.03) were independent prognostic factors for survival of cervical cancer patients. We conclude that clusterin expression could be a new molecular marker to predict response to platinum-based chemotherapy and survival of patients with cervical cancer treated with neoadjuvant chemotherapy and radical hysterectomy.
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Affiliation(s)
- Hidemichi Watari
- Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, North 15 West 7 Kita-Ku, Sapporo, Japan.
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Ortega R, Devès G, Carmona A. Bio-metals imaging and speciation in cells using proton and synchrotron radiation X-ray microspectroscopy. J R Soc Interface 2009; 6 Suppl 5:S649-58. [PMID: 19605403 DOI: 10.1098/rsif.2009.0166.focus] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The direct detection of biologically relevant metals in single cells and of their speciation is a challenging task that requires sophisticated analytical developments. The aim of this article is to present the recent achievements in the field of cellular chemical element imaging, and direct speciation analysis, using proton and synchrotron radiation X-ray micro- and nano-analysis. The recent improvements in focusing optics for MeV-accelerated particles and keV X-rays allow application to chemical element analysis in subcellular compartments. The imaging and quantification of trace elements in single cells can be obtained using particle-induced X-ray emission (PIXE). The combination of PIXE with backscattering spectrometry and scanning transmission ion microscopy provides a high accuracy in elemental quantification of cellular organelles. On the other hand, synchrotron radiation X-ray fluorescence provides chemical element imaging with less than 100 nm spatial resolution. Moreover, synchrotron radiation offers the unique capability of spatially resolved chemical speciation using micro-X-ray absorption spectroscopy. The potential of these methods in biomedical investigations will be illustrated with examples of application in the fields of cellular toxicology, and pharmacology, bio-metals and metal-based nano-particles.
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Affiliation(s)
- Richard Ortega
- Cellular Chemical Imaging and Speciation Group, CNAB, CNRS UMR 5084, University of Bordeaux, 33175 Gradignan, France.
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Faried LS, Faried A, Kanuma T, Aoki H, Sano T, Nakazato T, Tamura T, Kuwano H, Minegishi T. Expression of an activated mammalian target of rapamycin in adenocarcinoma of the cervix: A potential biomarker and molecular target therapy. Mol Carcinog 2008; 47:446-57. [PMID: 18058806 DOI: 10.1002/mc.20402] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Alterations of the Akt/mTOR pathway have been observed in numerous types of cancer, thus this pathway represents an exciting new target for molecular therapeutics. We investigated the expression of activated Akt (p-Akt) and mTOR (p-mTOR) in patients with adenocarcinoma of the cervix and the involvement of the p-Akt/p-mTOR pathway in response to combination of inhibitor agents, rapamycin and LY294002, with conventional therapy, cisplatin, in vitro. Immunohistochemistry analysis of p-Akt and p-mTOR was conducted in 26 patients with adenocarcinoma of the cervix. Western blot analysis was performed to determine the protein expression involved in response to chemotherapy in cervical cancer cell lines. The results showed that p-Akt and p-mTOR were identified in 50% and 53.8% of adenocarcinoma of the cervix. The expression of p-mTOR was a significant independent marker for prognosis. A significant correlation between p-Akt and p-mTOR was observed. There was no correlation between their expressions with any of clinicopathological factors. In the in vitro study, cisplatin at CPI(50) targets both the apoptosis and survival pathway by activating the caspase-cascade; inhibiting Akt, mTOR, p70S6K, and 4EBP1. Combination of rapamycin with cisplatin induced synergistic interaction. On the other hand, combination with LY294002 resulted in either synergistic or antagonistic effect depending on the doses given. Rapamycin pretreatment potentiated cisplatin-induced apoptosis cell death and enhanced blocking of the survival pathway. Overall, the expression of p-mTOR is a significant prognostic marker of adenocarcinoma of the cervix and a potential molecular target for the treatment of cervical cancer. Inhibition of the mTOR pathway contributes to cisplatin-induced apoptosis in cervical cancer cell lines.
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Affiliation(s)
- Leri S Faried
- Department of Gynecology and Reproductive Medicine, Graduate School of Medicine, Gunma University, Gunma, Japan
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Shimizu Y, Dobashi K, Kusakbe T, Nagamine T, Oikawa M, Satoh T, Haga J, Ishii Y, Ohkubo T, Kamiya T, Arakawa K, Sano T, Tanaka S, Shimizu K, Matsuzaki S, Utsugi M, Mori M. In-Air Micro-Particle Induced X-ray Emission Analysis of Asbestos and Metals in Lung Tissue. Int J Immunopathol Pharmacol 2008; 21:567-76. [DOI: 10.1177/039463200802100309] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Inhalation of asbestos increases the risk of lung cancer and pulmonary fibrosis. It is difficult to directly assess the distribution and content of inhaled particles in lung tissue sections. The purpose of this study is to employ an in-air micro particle induced X-ray emission (in-air micro-PIXE) system for assessment of the spatial distribution and content of asbestos and other metals in lung tissue. A proton ion-microbeam from this system was applied to irradiate lung tissue of patients with or without asbestosis, tumor tissue from both groups, and asbestos fibers ( in vitro). The content of each element composing asbestos and those of other metals were calculated and their distribution was assessed from the characteristic X-ray pattern for each element obtained after irradiation. This in-air micro-PIXE system could identify the location of asbestos bodies composed of Si, Mg, and Fe in lung tissue sections. Macrophage and lymphocytes accumulated in that area. This new system also revealed deposits of titanium, nickel, and cobalt in the lung tissues, in addition to asbestos bodies. The Si and Fe content were higher in lungs with asbestosis than in lungs without asbestosis or in tumor tissue. Analysis of asbestos fibers composed of chrysotile, crocidolite, and amosite showed that the ratios of Si, Fe, and Mg corresponded with those for the chemical structures. In-air micro-PIXE analysis is useful for assessing the distribution and quantities of asbestos bodies and also other metals in lung tissue comparing to immune-related cell localizations, and is also useful for analysis of standard asbestos fibers.
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Affiliation(s)
| | - K. Dobashi
- Gunma University Faculty of Health Science
| | - T. Kusakbe
- 21st Century COE Program, Gunma University Faculty of Health Science, Gunma
| | - T. Nagamine
- 21st Century COE Program, Gunma University Faculty of Health Science, Gunma
| | - M. Oikawa
- 21st Century COE Program, Gunma University Faculty of Health Science, Gunma
| | - T. Satoh
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, Gunma
| | - J. Haga
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, Gunma
| | - Y. Ishii
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, Gunma
| | - T. Ohkubo
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, Gunma
| | - T. Kamiya
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, Gunma
| | - K. Arakawa
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, Gunma
| | - T. Sano
- Department of Tumor Pathology, Gunma University Graduate School of Medicine
| | - S. Tanaka
- Department of General Surgical Science, Gunma University Graduate School of Medicine
| | - K. Shimizu
- Divisiont of Thoracic and Visceral Organ Surgery, Gunma University Graduate School of Medicine, Gunma, Japan
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