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切除不能膵癌の集学的治療効果判定における18F-fluorodeoxyglucose positron tomographyの有用性 18f -fluorodeoxyglucose positron tomography对无法切除的胰腺炎的集中治疗效果判定的有效性
Pub Date : 2011-12-20 DOI: 10.3191/THERMALMED.27.89
真 村上, 寛次 片山, 明夫 山口, 敦 飯田, 孝憲 五井, 靖夫 廣野, 秀樹 永野, 研司 小練
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引用次数: 0
Effectiveness of Regional Hyperthermia Combined with Lamivudine in Treating Chronic Hepatitis B 局部热疗联合拉米夫定治疗慢性乙型肝炎的疗效
Pub Date : 2011-09-20 DOI: 10.3191/THERMALMED.27.61
Zhang Lin, Shi Deng-Ping, Yang Wen-tao, Hu Bing, Weng Zhi-Ying, Xi Jian-dong, Jiang Shao-Lian, Kong Ya-mei, Li Wen-wen
The aim of this study was to evaluate the effectiveness of regional hyperthermia combined with lamivudine (LAM) for treatment of chronic hepatitis B (CHB) and explore its possible mechanism. Forty CHB patients were randomly divided into the combination group (treated with regional hyperthermia and LAM ; n=17) and control group (treated with LAM alone ; n=23). Laboratory examinations were performed for hepatic function, hepatitis B virus (HBV) markers, and HBV DNA. Lymphocyte subpopulations including CD3+ (total T cells), CD4+CD8- (helper T cells) and CD4-CD8+ (cytotoxic T cells) were detected with flow cytometry. The side effects and tolerance were observed. Aspartate aminotransferase and HBV-DNA levels were significantly lower in the combination group than in the control group (P< 0.05). Hepatitis e antigen/antibody conversion rate was similar between the two groups, whereas the combination group had significantly higher rates of CD4+/CD8+ T cells than the control group (P< 0.05). Regional hyperthermia combined with LAM is superior to LAM alone for treatment of CHB, which may be achieved by enhancing cellular immune function.
本研究旨在评价局部热疗联合拉米夫定(LAM)治疗慢性乙型肝炎(CHB)的疗效,并探讨其可能的机制。40例慢性乙型肝炎患者随机分为联合组(局部热疗+ LAM治疗;n=17)和对照组(仅用LAM治疗;n = 23)。进行肝功能、乙型肝炎病毒(HBV)标志物和HBV DNA的实验室检查。流式细胞术检测淋巴细胞亚群,包括CD3+(总T细胞)、CD4+CD8-(辅助T细胞)和CD4-CD8+(细胞毒性T细胞)。观察两种药物的副作用及耐受性。联合用药组患者的天冬氨酸转氨酶和HBV-DNA水平显著低于对照组(P< 0.05)。两组间戊型肝炎抗原/抗体转化率相近,联合治疗组CD4+/CD8+ T细胞转化率显著高于对照组(P< 0.05)。局部热疗联合LAM治疗CHB优于单独LAM,可能通过增强细胞免疫功能来实现。
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引用次数: 0
限局性前立腺癌に対してアンドロゲン除去療法による体積縮小後に施行した高エネルギー経尿道的マイクロ波高温度療法 : 8 年の治療経験 对局限性前列腺癌采用雄激素清除疗法缩小体积后实施的高能经尿道微波高温疗法:8年治疗经验
Pub Date : 2011-09-20 DOI: 10.3191/THERMALMED.27.69
健 小柴, 裕 重城, 隆大 鈴木, 理 大堀, 正弘 相原, 弘隆 中條, 秀之 溝口, 哲 志村
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引用次数: 1
Selecting Patients for Hyperthermia Treatment Based on Patient Backgrounds 基于患者背景选择患者进行热疗治疗
Pub Date : 2011-01-01 DOI: 10.3191/THERMALMED.27.51
Naoyuki Sakamoto, S. Kokura, T. Ishikawa, M. Tanigawa, Y. Naito, T. Yoshikawa
Use of hyperthermia as cancer treatment has often been impossible to continue at once following exacerbation of general condition due to cancer growth. However, no formal consensus has yet been defined regarding the acceptability of hyperthermia, so selection of patients for hyperthermia is not based on agreed clinical criteria. Aiming at the establishment of agreed clinical criteria concerning the selection of patients for hyperthermia, this report examined the treatment acceptability of hyperthermia based on patient backgrounds before advanced cancer treatment. Subjects comprised 45 patients with various advanced cancers treated with regional hyperthermia combined with chemo- or immunotherapy who visited our clinic between July 2008 and May 2009. Group A (n=24) underwent hyperthermia ≥ 8 times, while Group B (n=21) underwent hyperthermia ≤ 7 times (mean, 4.19 times). We investigated pretreatment laboratory data, body mass index, performance status (PS), Glasgow prognostic score (GPS), and quality of life (QOL). Patients with poor scores for both PS and GPS dropped out early. In these patients, elevations in both lactate dehydrogenase (LDH) and C-reactive protein (CRP) levels tended to be present in addition to hypoalbuminemia. QOL in Group B was already impaired before initiation of hyperthermia. PS and GPS appear to represent the most important factors when judging the acceptability of hyperthermia, while LDH, CRP, and albumin levels may help such judgments. The acceptability of hyperthermia can be predicted using patient background as evidenced by laboratory data and general conditions, including QOL, before cancer treatment. The results justified further examination in a large number of patients to aim the establishment of agreed clinical criteria concerning the selection of patients for hyperthermia.
使用热疗作为癌症治疗通常是不可能立即继续由于癌症生长的一般情况恶化。然而,关于热疗的可接受性还没有正式的共识,因此热疗患者的选择并不是基于商定的临床标准。本报告旨在建立关于热疗患者选择的一致临床标准,在癌症晚期治疗前根据患者背景检查热疗的治疗可接受性。研究对象包括45名在2008年7月至2009年5月期间就诊的各种晚期癌症患者,他们接受了局部热疗联合化疗或免疫治疗。A组(n=24)热疗≥8次,B组(n=21)热疗≤7次(平均4.19次)。我们调查了预处理实验室数据、体重指数、运动状态(PS)、格拉斯哥预后评分(GPS)和生活质量(QOL)。PS和GPS评分均较差的患者较早退出。在这些患者中,除了低白蛋白血症外,乳酸脱氢酶(LDH)和c反应蛋白(CRP)水平也趋于升高。B组患者的生活质量在热疗开始前就已受损。在判断热疗的可接受性时,PS和GPS似乎是最重要的因素,而LDH、CRP和白蛋白水平可能有助于这种判断。热疗的可接受性可以通过实验室数据和癌症治疗前的一般情况(包括生活质量)证明的患者背景来预测。结果证明了在大量患者中进一步检查的理由,目的是建立关于热疗患者选择的一致临床标准。
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引用次数: 0
Silencing heat shock transcription factor 1 using small interfering RNA enhances mild hyperthermia and hyperthermia sensitivity in human oral squamous cell carcinoma cells 使用小干扰RNA沉默热休克转录因子1增强人口腔鳞状细胞癌细胞的轻度热疗和热疗敏感性
Pub Date : 2011-01-01 DOI: 10.3191/THERMALMED.27.99
Y. Tabuchi, Yukihiro Furusawa, S. Wada, K. Ohtsuka, T. Kondo
Hyperthermia(HT)for various types of malignant tumor is a promising agent in anti-tumor action. However,the acquisition of thermotolerance in carcinoma cells due to the induction of heat shock proteins(HSPs)makes HT less effective. Recent findings suggest that a decrease in heat shock transcription factor 1 (HSF1) elicits sensitivity to HT in some kinds of carcinoma cells. Here we evaluated the effects of knockdown of HSF1 by small interfering RNA(siRNA)on the sensitivity to mild hyperthermia (MHT) and HT in human oral squamous cell carcinoma (OSCC) cells. Treatment of human OSCC HSC-3 cells with siHSF1-2,a siRNA for HSF1,effectively decreased the protein expression level of HSF1 in a time-dependent manner at 37°C, and almost complete knockdown of HSF1 was observed at 48 h post treatment. Moreover,although a remarkable elevation of protein expression of HSPs such as Hsp70,Hsp40 and Hsp27 was detected in HSC-3 cells treated with MHT at 42°C and HT at 44°C for 90 min,expression of these HSPs was significantly decreased in HSF1-silenced cells under normal and hyperthermic conditions. In HSC-3 cells,knockdown of HSF1 significantly decreased the number of viable cells at 37°C, suggesting that HSF1 may be required for normal cell growth. In addition,sensitivity to MHT or HT was markedly enhanced in HSF1-silenced HSC-3 cells. Moreover, we observed an increase in sensitivity to these hyperthermic treatments by silencing of HSF1 in human OSCC cell lines HO-1-N-1,HO-1-u-1 and SAS. These findings indicate that silencing of HSF1 enhances sensitivity to MHT and HT in human OSCC cells,and that hyperthermic treatment combined with HSF1 silencing has potential significance in OSCC therapy. HSF1 siRNA enhances thermosensitivity・Y.Tabuchi et al. ― ― 99 Received 22 November,2011,Accepted 1 December,2011. Corresponding author;Tel,+81-76-434-7185;Fax,+81-76-434-5176; e-mail,ytabu@cts.u-toyama.ac.jp doi:10.3191/thermalmed.27.99 ©2011 Japanese Society for Thermal Medicine
热疗治疗各种类型的恶性肿瘤是一种很有前途的抗肿瘤药物。然而,由于热休克蛋白(HSPs)的诱导,癌细胞获得了耐热性,使得高温疗法的效果降低。最近的研究结果表明,热休克转录因子1 (HSF1)的降低引起某些类型的癌细胞对热休克的敏感性。本研究评估了小干扰RNA(siRNA)敲低HSF1对人口腔鳞状细胞癌(OSCC)细胞对轻度高温(MHT)和高温敏感性的影响。用HSF1的siRNA sihsf1 - 1-2处理人OSCC HSC-3细胞,在37℃时,HSF1蛋白的表达水平呈时间依赖性降低,在处理后48 h, HSF1几乎完全被敲除。此外,尽管在42°C MHT和44°C HT处理90 min的hsf1 -3细胞中检测到Hsp70、Hsp40和Hsp27等热休克蛋白的表达显著升高,但在正常和高温条件下,hsf1沉默细胞中这些热休克蛋白的表达显著降低。在HSC-3细胞中,37°C时敲低HSF1显著降低活细胞数量,提示正常细胞生长可能需要HSF1。此外,hsf1沉默的HSC-3细胞对MHT或HT的敏感性显著增强。此外,我们通过沉默人OSCC细胞系HO-1-N-1、HO-1-u-1和SAS中的HSF1,观察到对这些高温处理的敏感性增加。这些发现表明,HSF1沉默可增强人OSCC细胞对MHT和HT的敏感性,热疗联合HSF1沉默在OSCC治疗中具有潜在意义。HSF1 siRNA增强热敏性。Tabuchi et al. 2011年11月22日收稿,2011年12月1日收稿。通讯作者,电话+ 81-76-434-7185,传真+ 81-76-434-5176;e-mail,ytabu@cts.u-toyama.ac.jp doi:10.3191/thermalmed.27.99©2011日本热医学学会
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引用次数: 9
Whole body hyperthermiaによる間質コラゲナーゼ活性の変化と間質リモデリング仮説 Whole body hyperthermia引起的间质聚合酶活性的变化和间质改造假说
Pub Date : 2010-12-20 DOI: 10.3191/THERMALMED.26.109
晃久 竹内, 蓮村 ひろみ, 関谷 巳知秋, 正一 白髭, 恵美 原山, 幸子 琴寄, 隆子 竹内
Matrix metalloproteinase-1 (MMP-1) has received a considerable attention as one of factors, enhancing tumor infiltration and metastasis. We determined serum levels of MMP-1 and TIMP-2, a tissue inhibitor of metalloproteinase-2 (a protein that suppresses all MMPs activity). Furthermore, we monitored changes in serum levels of MMP-1 and TIMP-2 after Whole Body Hyperthermia (WBH). Samples were collected from 46 patients with advanced cancers and 20 healthy volunteers were also examined for MMP-1 and TIMP-2. Furthermore, they were monitored for 36 patients undergoing one cycle of WBH, three weeks after completion of WBH. Mean serum level of MMP-1 in patients was increased to a significant extent whereas mean serum level of TIMP-2 was markedly lowered, compared to healthy individuals. MMP-1 activity was assessed by MMP-1/TIMP-2 ratio, and the ratio was 0.43 for cancer patients and 0.15 for healthy individuals, thus showing that cancer patients exhibited an apparently higher MMP-1/TIMP-2 ratio than healthy individuals. MMP-1 activity was nearly normalized in 9 responders after WBH, i .e ., from 0.37 (before) to 0.21 (after), whereas MMP-1 activity was increased from 0.43 (before) to 0.51 (after) in 27 non-responders. MMP-1 activity was increased approximately by 3-fold in patients, compared to healthy individuals. MMP-1 activity was normalized in WBH-responders.
基质金属蛋白酶-1 (Matrix metalloproteinase-1, MMP-1)作为促进肿瘤浸润转移的因素之一,受到了广泛关注。我们测定了血清中MMP-1和TIMP-2的水平,TIMP-2是金属蛋白酶-2(一种抑制所有MMPs活性的蛋白质)的组织抑制剂。此外,我们监测了全身热疗(WBH)后血清MMP-1和TIMP-2水平的变化。从46名晚期癌症患者和20名健康志愿者中收集样本,同时检测MMP-1和TIMP-2。此外,他们还监测了36名患者在完成whbh后三周进行一个周期的whbh。与健康个体相比,患者血清MMP-1平均水平显著升高,而TIMP-2平均水平显著降低。通过MMP-1/TIMP-2比值评估MMP-1活性,癌症患者的MMP-1/TIMP-2比值为0.43,健康个体为0.15,表明癌症患者的MMP-1/TIMP-2比值明显高于健康个体。WBH后,9名应答者的MMP-1活性几乎恢复正常,即从0.37(治疗前)到0.21(治疗后),而27名无应答者的MMP-1活性从0.43(治疗前)增加到0.51(治疗后)。与健康个体相比,患者的MMP-1活性增加了约3倍。wbh应答者的MMP-1活性恢复正常。
{"title":"Whole body hyperthermiaによる間質コラゲナーゼ活性の変化と間質リモデリング仮説","authors":"晃久 竹内, 蓮村 ひろみ, 関谷 巳知秋, 正一 白髭, 恵美 原山, 幸子 琴寄, 隆子 竹内","doi":"10.3191/THERMALMED.26.109","DOIUrl":"https://doi.org/10.3191/THERMALMED.26.109","url":null,"abstract":"Matrix metalloproteinase-1 (MMP-1) has received a considerable attention as one of factors, enhancing tumor infiltration and metastasis. We determined serum levels of MMP-1 and TIMP-2, a tissue inhibitor of metalloproteinase-2 (a protein that suppresses all MMPs activity). Furthermore, we monitored changes in serum levels of MMP-1 and TIMP-2 after Whole Body Hyperthermia (WBH). Samples were collected from 46 patients with advanced cancers and 20 healthy volunteers were also examined for MMP-1 and TIMP-2. Furthermore, they were monitored for 36 patients undergoing one cycle of WBH, three weeks after completion of WBH. Mean serum level of MMP-1 in patients was increased to a significant extent whereas mean serum level of TIMP-2 was markedly lowered, compared to healthy individuals. MMP-1 activity was assessed by MMP-1/TIMP-2 ratio, and the ratio was 0.43 for cancer patients and 0.15 for healthy individuals, thus showing that cancer patients exhibited an apparently higher MMP-1/TIMP-2 ratio than healthy individuals. MMP-1 activity was nearly normalized in 9 responders after WBH, i .e ., from 0.37 (before) to 0.21 (after), whereas MMP-1 activity was increased from 0.43 (before) to 0.51 (after) in 27 non-responders. MMP-1 activity was increased approximately by 3-fold in patients, compared to healthy individuals. MMP-1 activity was normalized in WBH-responders.","PeriodicalId":23299,"journal":{"name":"Thermal Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83783522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
術前温熱化学放射線療法が著効し組織学的に完全奏功が証明された原発性肺癌の一例(A Case of Lung Cancer with Chest Wall Invasion Showed a Pathologically Complete Response to Preoperative Thermo-chemo-radiotherapy) 术前温热化学放射线疗法有效,组织学证明完全奏效的原发性肺癌一例(A Case of Lung Cancer with Chest Wall Invasion Showed APathologically Complete Response to Preoperative Thermo-chemo-radiotherapy)
Pub Date : 2010-01-01 DOI: 10.3191/THERMALMED.27.25
K. Terashima, Y. Shioyama, S. Nomoto, Saiji Ohga, Takeshi Nonoshita, Tadamasa Yoshitake, K. Ohnishi, K. Asai, Keiji Matsumoto, Koichi Takayama, Katsumasa Nakamura, Hiromi Terashima, H. Honda
A case of lung cancer with chest wall invasion treated by preoperative thermo-chemo-radiotherapy revealed a histologically complete response after complete resection is reported. A 55-year-old male was diagnosed as primary lung cancer originating from the right upper lobe, cT3N0M0, stage IIB. The tumor invaded the right chest wall accompanied with obstructive pneumonia at its dorsal side and was rapidly growing. Thus, preoperative thermo-chemo-radiotherapy was performed. He was treated with conventional irradiation with a 10 MV X-ray, a total dose of 40 Gy, and concurrent chemotherapy with cisplatin (CDDP) and vinorelbine (VNR). Hyperthermia was applied within 30 min after each radiotherapy with a RF-capacitive heating apparatus (Thermotron RF-8, Ymamamoto Vinyter, Osaka, Japan), 40 min/time, once a week, for a total of 4 times. The tumor revealed necrotic change on CT images after thermo-chemo-radiotherapy and was completely resected. No viable cancer cells were observed in the histological examination (Ef 3). Even 17 months later, there was no recurrence.
本文报告一例肺癌侵袭胸壁术前热化疗放射治疗在完全切除后组织学完全缓解。55岁男性,诊断为原发性肺癌,起源于右上肺叶,cT3N0M0,分期IIB。肿瘤侵犯右胸壁,并伴背侧梗阻性肺炎,生长迅速。因此,术前进行热化疗放疗。患者接受10 MV x线常规照射,总剂量40 Gy,同时联合顺铂(CDDP)和长春瑞滨(VNR)化疗。每次放疗后30分钟内使用射频容性加热装置(Thermotron RF-8, Ymamamoto Vinyter, Osaka, Japan)进行热疗,40分钟/次,每周1次,共4次。经热化疗放疗后,肿瘤在CT上显示坏死改变,并被完全切除。组织学检查未见活的癌细胞(Ef 3),即使在17个月后也未复发。
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引用次数: 0
A Fundamental Numerical Analysis for Noninvasive Thermometry Integrated in a Heating Applicator Based on the Reentrant Cavity 基于可重入腔的加热器无创测温的基本数值分析
Pub Date : 2010-01-01 DOI: 10.3191/THERMALMED.26.51
H. Ohwada, Y. Ishihara
To improve the efficacy of hyperthermia treatment, a novel method of noninvasive measurement of body temperature change is proposed. The proposed technology, thermometry, is based on changes in the electromagnetic field distribution inside the heating applicator with temperature changes and the temperature dependence of the dielectric constant. In addition, an image of the temperature change distribution inside a body is reconstructed by applying a computed tomography (CT) algorithm. The proposed thermometry method can serve as a possible noninvasive method to monitor the temperature change distribution inside the body without the use of enormous thermometers such as in the case of magnetic resonance imaging (MRI). Furthermore, this temperature monitoring method can be easily combined with a heating applicator based on a cavity resonator, and the novel integrated treatment system can possibly be used to treat cancer effectively while noninvasively monitoring the heating effect. In this paper, the phase change distributions of the electromagnetic field with temperature changes are simulated by numerical analysis using the finite difference time domain (FDTD) method. Moreover, to estimate the phase change distributions inside a target body, the phase change distributions with temperature changes are reconstructed by a filtered back-projection. In addition, the reconstruction accuracy of the converted temperature change distribution from the phase change is evaluated
为了提高热疗治疗的疗效,提出了一种无创测量体温变化的新方法。所提出的测温技术是基于加热装置内部电磁场分布随温度变化的变化以及介电常数对温度的依赖关系。此外,利用计算机断层扫描(CT)算法重建了人体内部温度变化分布的图像。所提出的测温方法可以作为一种可能的无创方法来监测体内的温度变化分布,而不需要像磁共振成像(MRI)那样使用巨大的温度计。此外,这种温度监测方法可以很容易地与基于腔谐振器的加热应用器相结合,并且新的集成治疗系统可以在无创监测加热效果的同时有效地治疗癌症。本文采用时域有限差分(FDTD)方法,对温度变化时电磁场的相变分布进行了数值模拟。此外,为了估计目标体内部的相变分布,通过滤波后的反投影重建了温度变化时的相变分布。此外,还对相变转换后的温度变化分布重建精度进行了评价
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引用次数: 1
Current Status and Future Directions of Hyperthermia at the University of Occupational and Environmental Health 职业与环境卫生大学热疗的现状与未来方向
Pub Date : 2010-01-01 DOI: 10.3191/THERMALMED.26.87
T. Ohguri, K. Yahara, M. Murakami, H. Imada, H. Terashima, Y. Korogi
Hyperthermia(HT)using a 8-MHz radiofrequency-capacitive heating device at University of Occupational and Environmental Health(UOEH)was initiated in 1988,and over 1000 patients have been treated with HT. The heat had been performed by radiation oncologist for long period. In recent years, it has been supported by medical engineer and nurse as instructed in radiation oncologist. Basically,HT has been performed concurrent with radiotherapy or chemoradiotherapy,and the combined therapy of systemic chemotherapy with regional HT has been increasing since 2004. Recently,advances in physics for radiotherapy cause a significant improvement of tumor control rates. However, a further improvement of the local tumor control rate is still demanded for a lot of locally advanced cancer or loco-regional recurrent cancer. The regional HT may remain important role for those advanced tumors. In the patients with locally advanced lung or esophageal cancers, the combined therapy of chemoradiotherapy and regional HT has been used actively at UOEH. In addition,we have tried the adding of regional HT in the patients with the limited treatment choices,such as re-irradiation for the patients with in-field recurrence, and re-administration of chemotherapy for multidrug-resistant cases. Here,we review current status of HT,especially for heating methods of deep regional HT,at UOEH,and discuss future direction for deep regional HT to improve clinical outcome of HT inclusive therapy.
职业与环境卫生大学(UOEH)于1988年开始使用8mhz射频电容加热装置进行热疗(HT),已有1000多名患者接受了热疗治疗。放射肿瘤学家已经进行了很长时间的研究。近年来,在放射肿瘤学家的指导下,它得到了医学工程师和护士的支持。HT基本上与放疗或放化疗同时进行,自2004年以来,全身化疗与局部HT联合治疗的情况有所增加。近年来,放射治疗的物理进展使肿瘤控制率显著提高。然而,对于许多局部晚期肿瘤或局部-区域复发肿瘤,仍需要进一步提高局部肿瘤控制率。局部HT在晚期肿瘤中仍有重要作用。在局部晚期肺癌或食管癌患者中,UOEH积极采用放化疗和局部HT联合治疗。此外,我们还尝试在治疗选择有限的患者中增加局部激素治疗,如对野区复发患者进行再照射,对多药耐药病例进行再化疗。在此,我们回顾了UOEH深部热疗的现状,特别是深部热疗的加热方法,并讨论了深部热疗的未来发展方向,以提高深部热疗包容性治疗的临床效果。
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引用次数: 2
Molecular Chaperone Inducers Facilitate the Functional Restoration of Temperature-sensitive Mutant p53 Protein 分子伴侣诱导剂促进温度敏感突变p53蛋白的功能恢复
Pub Date : 2010-01-01 DOI: 10.3191/THERMALMED.26.1
D. Kawashima, Minoru Soga, Rika Takeuchi, H. Matsumoto, K. Ohtsuka
The tumor suppressor gene p53 encodes a transcription factor and is known to be the most frequently mutated gene (approximately 50%) in human cancer. The functional restoration of mutant p53 protein is considered to be one type of anticancer treatment ; and some chemical compounds, including CP-31398, PRIMA-1 (p53 reactivation and induction of massive apoptosis), and glycerol, have been shown to restore its function. We here investigated whether molecular chaperone inducers such as carbenoxolone (CBX), paeoniflorin (PF), and sodium salicylate (SA) could restore the functional defect of a temperature-sensitive mutant p53 protein (V143A). Functional restoration of p53 was detected by the induction of wild-type p53 activated fragment 1 (WAF1) and mouse double minute 2 (MDM2), both of which are gene products transactivated by an active p53. When H1299/tsp53 cells were cultured continuously at a nonpermissive temperature (37°C), no apparent expression of WAF1 and MDM2 was observed. Upon the temperature shift-down from 37°C to a permissive temperature (32°C), WAF1 and MDM2 gradually accumulated in the cells at 6 to 12 h later, probably owing to the gradual appearance of wild-type p53. When the cells were treated with molecular chaperone inducers at 37°C and then the temperature was shifted down, WAF1 and MDM2 appeared much earlier at 3 to 6 h, and also in much higher amounts than those in the control cells. Inhibition of molecular chaperone induction by quercetin or heat shock factor 1 (HSF1) siRNA diminished the facilitative effect of molecular chaperone inducers. Also, long-term overexpression (48 h) of molecular chaperones by CBX led to the accumulation of wild-type p53 even at 37°C. These results suggested that moderately overexpressed molecular chaperones could facilitate the correct folding and functional restoration of mutant p53 protein.
肿瘤抑制基因p53编码一种转录因子,是人类癌症中最常见的突变基因(约50%)。突变型p53蛋白的功能恢复被认为是一种抗癌治疗方法;一些化合物,包括CP-31398, PRIMA-1 (p53的再激活和诱导大量凋亡)和甘油,已被证明可以恢复其功能。我们在这里研究了分子伴侣诱诱剂如卡贝诺洛酮(CBX)、芍药苷(PF)和水杨酸钠(SA)是否可以恢复温度敏感突变体p53蛋白(V143A)的功能缺陷。通过诱导野生型p53激活片段1 (WAF1)和小鼠双分钟2 (MDM2)来检测p53的功能恢复,这两种基因都是被活性p53反激活的基因产物。H1299/tsp53细胞在非允许温度(37℃)下连续培养,未观察到WAF1和MDM2的明显表达。当温度从37℃降至允许温度(32℃)时,WAF1和MDM2在6 ~ 12 h后逐渐在细胞中积累,这可能是野生型p53逐渐出现的原因。37℃分子伴侣诱导剂处理细胞后,温度降低后,在3 ~ 6 h时,WAF1和MDM2的出现时间明显早于对照细胞,出现量也明显高于对照细胞。槲皮素或热休克因子1 (HSF1) siRNA对分子伴侣诱导的抑制作用减弱了分子伴侣诱导剂的促进作用。此外,CBX长期过表达分子伴侣(48 h)导致野生型p53即使在37°C下也会积累。这些结果表明,适度过表达的分子伴侣可以促进突变p53蛋白的正确折叠和功能恢复。
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引用次数: 2
期刊
Thermal Medicine
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