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Kurosu T, Tsuji K, Kida A, Koyama T, Yamamoto M, Miura O. Rottlerin synergistically enhances imatinib-induced apoptosis of BCR/ABL-expressing cells through its mitochondrial uncoupling effect independent of protein kinase C-δ. Oncogene 2006; 26:2975-87. [PMID: 17130834 DOI: 10.1038/sj.onc.1210117] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Although the BCR/ABL tyrosine kinase inhibitor imatinib is highly effective for treatment of chronic myeloid leukemia (CML) and Philadelphia-chromosome positive acute lymphoblastic leukemia (ALL), relapse with emerging imatinib-resistance mutations in the BCR/ABL kinase domain poses a significant problem. Here, we demonstrate that rottlerin, a putative protein kinase C-delta (PKCdelta)-specific inhibitor, acts synergistically with imatinib to induce apoptosis of BCR/ABL-expressing K562 and Ton.B210 cells. However, rottlerin inhibited neither PKCdelta nor BCR/ABL in these cells. On the other hand, rottlerin, previously characterized also as a mitochondrial uncoupler, transiently but significantly reduced mitochondrial membrane potential and gradually induced mitochondrial membrane permeabilization. Moreover, two other mitochondrial uncouplers, FCCP and DNP, very similarly induced apoptosis of BCR/ABL-expressing cells in a synergistic manner with imatinib. Imatinib synergistically enhanced mitochondrial membrane permeabilization induced by mitochondrial uncouplers, which led to release of cytochrome c into the cytoplasm and activation of caspases-3 and -9. Rottlerin also enhanced the cytotoxic effect of imatinib in leukemic cells from patients with CML blast crisis and Ph-positive ALL or a cell line expressing the imatinib-resistant E255K BCR/ABL mutant. The present study indicates that rottlerin synergistically enhances imatinib-induced apoptosis through its mitochondrial uncoupling effect independent of PKCdelta and may contribute to the development of new treatment strategy to overcome the imatinib resistance and to cure the BCR/ABL expressing leukemias.
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Sakaguchi H, Seki S, Iwai S, Kadoya H, Ido K, Isoda N, Tsuji K, Teramoto K, Suzuki M, Kioka K. Endoscopic thermal ablation therapies for hepatocellular carcinoma; multi-center study. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.4147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
4147 Background: Differences of efficacy between radiofrequency ablation (RFA) and microwave coagulation (MWC) for hepatocellular carcinoma (HCC) is still unknown. So we performed multi-center study to assess factors contributing to survival among patients treated by endoscopic thermal ablation for single HCC. Methods: 396 patients in six institutions with single HCC who were firstly treated by endoscopic thermal ablation were enrolled in this study and assessed retrospectively. Among 396 patients, 347 were treated under general anesthesia and 49 were treated local anesthesia. 144 were treated by MWC and 252 were treated by RFA. 383 were ablated laparoscopically and 13 were done thoracoscopically. 230 HCCs were located superficial position of liver and 166 were deep position. Classification with Child-Turcotte-Pugh score, the Japan Integrated Staging score, and the Cancer of the Italian Program scoring system were performed. All patients were analyzed survival rates by Kaplan-Meier method and differences among groups were compared by the log-rank test. Results: Five year survival rates of all 396 patients were 63% and ten year survival rates were 42%. Differences between general and local anesthesia were not significant (p = 0.28). Differences between MWC and RFA were not significant (p = 0.77). Location of HCCs were not significant (p = 0.89). Differences among groups classified by Child-Turcotte-Pugh score were significant (p = 0.017). Classification by the Japan Integrated Staging score was not significant (p = 0.24). However, classification by the Cancer of the Italian Program scoring system were significant (p = 0.001). Conclusions: Endoscopic thermal ablation therapies for HCC was effective. Differences of efficacy between RFA and MWC were not found. No significant financial relationships to disclose.
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Jin A, Kurosu T, Tsuji K, Mizuchi D, Arai A, Fujita H, Hattori M, Minato N, Miura O. BCR/ABL and IL-3 activate Rap1 to stimulate the B-Raf/MEK/Erk and Akt signaling pathways and to regulate proliferation, apoptosis, and adhesion. Oncogene 2006; 25:4332-40. [PMID: 16518411 DOI: 10.1038/sj.onc.1209459] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The Ras family small GTPase Rap1 is activated by hematopoietic cytokines, such as interleukin (IL)-3, to induce beta1 integrin-mediated cell adhesion or by the BCR/ABL fusion tyrosine kinase to stimulate the MEK/Erk signaling pathway. Here, we demonstrate that the abrogation of Rap1 activation by SPA-1, a Rap1-specific GAP, inhibits activation of B-Raf, MEK, Erk, and Akt in a murine hematopoietic cell line, Ton.B210, stimulated with IL-3 or inducibly expressing BCR/ABL. Furthermore, Rap1 inactivation had an inhibitory effects on proliferation and survival of Ton.B210 cells, which were more remarkable when cells were stimulated by BCR/ABL than by IL-3. Induction of BCR/ABL expression increased adhesion of Ton.B210 cells to fibronectin in a manner at least partly dependent on its kinase activity, and Rap1 inhibition by SPA-1 partially inhibited BCR/ABL-induced adhesion of cells. Thus, IL-3- or BCR/ABL-induced activation of Rap1 may play important roles in regulation of cell proliferation and survival through activation of the B-Raf/MEK/Erk and Akt signaling pathways and in induction of integrin-mediated cell adhesion. Furthermore, as compared with IL-3, BCR/ABL is more dependent on Rap1-mediated signaling to induce cell proliferation and survival and, thus, Rap1 may represent an attractive target for novel therapies for leukemias caused by BCR/ABL.
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Nakase K, Tsuji K, Nagaya S, Tamaki S, Tanigawa M, Ikeda T, Miyanishi E, Shiku H. Acute interstitial pneumonitis during chemotherapy for haematological malignancy. Eur J Cancer Care (Engl) 2006; 14:336-41. [PMID: 16098118 DOI: 10.1111/j.1365-2354.2005.00589.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fourteen adult patients with haematological malignancies (eight non-Hodgkin's lymphoma, one multiple myeloma, one chronic lymphocytic leukaemia, two acute lymphoblastic leukaemia and two acute myeloid leukaemia) developed acute interstitial pneumonitis (IP) during the course of chemotherapy. All patients manifested high fever over 38 degrees C, bilateral diffuse pulmonary interstitial infiltrates in the chest radiograph and severe hypoxia without hypercapnia in the arterial blood gas analysis. Pathogenic microorganisms were not detected in repeated examinations in any patient. Chemotherapy given included various anti-neoplastic drugs. Five patients had received granulocyte colony-stimulating factor (G-CSF) for chemotherapy-induced leucopenia. The onset was associated with an increase of leucocytes in 10 patients. All patients were treated with high dose steroid hormone and broad spectrum antibiotics with or without anti-fungal agents, and three required mechanical ventilation. Eleven patients quickly recovered from these situations, whereas three died. Autopsies were done in two patients and disclosed pneumocystis carinii (PC) pneumonitis in one and non-specific pulmonary congestive oedema and fibrosis in the other. In conclusion, IP of unknown cause could develop in patients with various haematological malignancies especially at the recovery phase of chemotherapy-induced leucopenia irrespective of the previous G-CSF administration. High dose steroid hormone should be used as therapy for such patients as soon as possible after exclusion of an infective aetiology.
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Morizane S, Suzuki D, Tsuji K, Oono T, Iwatsuki K. The role of CD4 and CD8 cytotoxic T lymphocytes in the formation of viral vesicles. Br J Dermatol 2006; 153:981-6. [PMID: 16225610 DOI: 10.1111/j.1365-2133.2005.06849.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Herpetic vesicles caused by herpes simplex virus and varicella zoster virus, and hydroa vacciniforme (HV) are characterized by umbilicated vesicule formation. OBJECTIVES To understand the histogenesis of umbilicated vesicles in herpetic vesicles and HV, we demonstrated the presence of the virus-associated molecules in the lesions, and the pathogenic role of cytotoxic T-lymphocyte (CTL) immune responses. METHODS Phenotyping of infiltrating cells was carried out in biopsy specimens from herpes simplex, varicella, herpes zoster and HV, and compared with nonviral contact dermatitis. Viral antigens and Epstein-Barr virus-encoded small nuclear RNA (EBER) were detected by immunostaining and by in situ hybridization, respectively. Infiltrating CTLs expressing granzyme B and granulysin were determined by double immunostaining using confocal laser scanning microscopy. RESULTS In all herpetic vesicles, the corresponding viral antigens were observed in the cytopathic keratinocytes, and infiltration of lymphoid cells was present in the upper dermis and around the vessels. In all HV lesions studied, EBER+ T cells made up 5-10% of the dermal infiltrates and the dermal infiltrates contained almost no CD56 cells. CTLs expressing granzyme B and granulysin were present in both herpetic and HV lesions, in which they made up 10-30% of the total dermal infiltrates, whereas they comprised less than 5% of the infiltrates of biopsy specimens from nonviral contact dermatitis. Confocal laser microscopic examination demonstrated that both CD4+ and CD8+ T cells expressed granzyme B and granulysin. CONCLUSIONS CD4+ and/or CD8+ CTLs reactive to the virus-infected cells might be responsible for the histogenesis of herpetic and HV lesions characterized by umbilicated vesicles.
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Amoh Y, Li L, Tsuji K, Moossa A, Katsuoka K, Hoffman R, Bouvet M. Dual-color imaging of nascent angiogenesis of pancreatic cancer in an orthotopic model. J Surg Res 2006. [DOI: 10.1016/j.jss.2005.11.296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Tsuji K, Yamaguchi T, Onodera N, Saruwatari M. Filter-free wavelength converter using Sagnac loop and delayed interferometer. OPTICS EXPRESS 2006; 14:575-580. [PMID: 19503373 DOI: 10.1364/opex.14.000575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A filter-free fiber-XPM-based wavelength converter is proposed and experimentally demonstrated without conventional bandpass optical filters used to filter out the converted signal. The converter is constructed with a propagation-diversity Sagnac loop to separate a converted signal from a pump signal and a delayed interferometer to covert the XPM signal into intensity modulation. We show that 10-Gbit/s input signals are successfully converted to signals with allotted wavelengths by our proposed scheme.
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Tsuji K, Yamamoto S, Ou W, Nishi N, Kobayashi I, Zaitsu M, Muro E, Sadakane Y, Ichimaru T, Hamasaki Y. dsRNA enhances eotaxin-3 production through interleukin-4 receptor upregulation in airway epithelial cells. Eur Respir J 2006; 26:795-803. [PMID: 16264039 DOI: 10.1183/09031936.05.00010805] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The exacerbation of asthma during viral infections is mainly explained by neutrophils infiltrating into the airways. However, enhanced functions of eosinophils are also observed. The aim of this study was to reveal the mechanism of how eosinophils are activated during and after viral infection of the airways, using a model of viral infection. A synthetic double-stranded RNA, poly inosinic-cytidyric acid (poly(IC)), was transfected to a human airway epithelial cell line (BEAS-2B) and the primary bronchial epithelial cells, to mimic a viral infection. The production of chemokines from the cells was investigated. The transfection of poly(IC), alone, marginally affected the eotaxin-3 production of the cells. However, the transfection of poly(IC) prior to interleukin (IL)-4 stimulation enhanced eotaxin-3 production. Poly(IC) transfection increased mRNA and protein expressions of IL-4 receptor (R)alpha and IL-2Rgamma, components of the IL-4R. In BEAS-2B cells, IL-4-mediated phosphorylation of signal transducer and activator of transcription six was enhanced in poly(IC) transfected cells. This was reversed by the addition of anti-IL-4Ralpha antibody, suggesting the role of an increased number of IL-4 receptors in enhanced IL-4-induced eotaxin-3 production. Poly(IC)-induced upregulation of IL-4Ralpha was inhibited by treatment with cycloheximide or dexamethasone. In conclusion, these results suggest that viral airway infection may enhance interleukin-4-induced eotaxin-3 production through upregulation of the interleukin-4 receptor in airway epithelial cells.
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Hino K, Nifuji A, Morinobu M, Tsuji K, Ezura Y, Nakashima K, Yamamoto H, Noda M. Unloading-induced bone loss was suppressed in gold-thioglucose treated mice. J Cell Biochem 2006; 99:845-52. [PMID: 16721830 DOI: 10.1002/jcb.20935] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Loss of mechanical stress causes bone loss. However, the mechanisms underlying the unloading-induced bone loss are largely unknown. Here, we examined the effects of gold-thioglucose (GTG) treatment, which destroys ventromedial hypothalamus (VMH), on unloading-induced bone loss. Unloading reduced bone volume in control (saline-treated) mice. Treatment with GTG-reduced bone mass and in these GTG-treated mice, unloading-induced reduction in bone mass levels was not observed. Unloading reduced the levels of bone formation rate (BFR) and mineral apposition rate (MAR). GTG treatment also reduced these parameters and under this condition, unloading did not further reduce the levels of BFR and MAR. Unloading increased the levels of osteoclast number (Oc.N/BS) and osteoclast surface (Oc.S/BS). GTG treatment did not alter the basal levels of these bone resorption parameters. In contrast to control, GTG treatment suppressed unloading-induced increase in the levels of Oc.N/BS and Oc.S/BS. Unloading reduced the levels of mRNA expression of the genes encoding osteocalcin, type I collagen and Cbfa1 in bone. In contrast, GTG treatment suppressed such unloading-induced reduction of mRNA expression. Unloading also enhanced the levels of fat mass in bone marrow and mRNA expression of the genes encoding PPARgamma2, C/EBPalpha, and C/EBPbeta in bone. In GTG-treated mice, unloading did not increase fat mass and the levels of fat-related mRNA expression. These results indicated that GTG treatment suppressed unloading-induced alteration in bone loss.
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Tsuji E, Takahashi M, Kinoshita S, Tanaka M, Tsuji K. We-P14:398 Additive effects of sterols to rice bran oil on serum cholesterol levels in rats. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)81751-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Morizane S, Yamamoto T, Hisamatsu Y, Tsuji K, Oono T, Hashimoto T, Iwatsuki K. Pemphigus vegetans with IgG and IgA antidesmoglein 3 antibodies. Br J Dermatol 2005; 153:1236-7. [PMID: 16307672 DOI: 10.1111/j.1365-2133.2005.06956.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hirakawa E, Inada K, Tsuji K. Asymptomatic dissecting aneurysm of the coeliac artery: a variant of segmental arterial mediolysis. Histopathology 2005; 47:544-6. [PMID: 16242010 DOI: 10.1111/j.1365-2559.2005.02149.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Tsuji K, Ikeda H, Saito M. [Diaphragmatic eventration with paroxysmal supraventricular tachycardia; report of a case]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 2005; 58:1006-9. [PMID: 16235852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A 68-year-old man visited our hospital complaining of chest discomfort and palpitation and was hospitalized under the diagnosis of diaphragmatic eventration. The chest X-ray showed an elevated left hemidiaphragm including air bubbles. The chest computed tomography (CT) and magnetic resonance imaging (MRI) showed a very high position of the left hemidiaphragm and displacement of the abdominal organs into the left thoracic cavity. The Holter electrocardiogram showed paroxysmal supraventricular tachycardia. The procedure was performed under video-assisted thoracoscopic surgery with a minithoracotomy (7 cm) in the 8th intercostal space. The left diaphragm appeared loose and reduced in thickness, the diaphragm was incised and longitudinal plication 12cm in diameter was accomplished with a series of U-stitches with Teflon-felt. Furthermore, the suture line was reinforced by prolene mesh. Postoperative course was uneventful, and the chest symptom and arrhythmia were resolved immediately.
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Allard D, Ito F, Gobin B, Tsuji K, Billen J. Differentiation of the reproductive tract between dominant and subordinate workers in the Japanese queenless ant Diacamma sp. ACTA ZOOL-STOCKHOLM 2005. [DOI: 10.1111/j.1463-6395.2005.00197.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Heller AH, Salzano FM, Barrantes R, Krylov M, Benevolenskaya L, Arnett FC, Munkhbat B, Munkhtuvshin N, Tsuji K, Hutz MH, Carnese FR, Goicoechea AS, Freitas LB, Bonatto SL. Intra- and intercontinental molecular variability of an Alu insertion in the 3' untranslated region of the LDLR gene. Hum Biol 2005; 76:591-604. [PMID: 15754974 DOI: 10.1353/hub.2004.0056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
One-hundred three individuals from two Mongolian, two Siberian, and ten native American populations were studied in relation to a 340-bp sequence from an Alu insertion located in the 3' untranslated region of the LDLR gene. Seven haplotypes have been determined, and haplotype B1 was the most common, accounting for about half the sequences found. In general, diversity values are quite high, about 2.5 times higher than those found in other autosomal Alu sequences. Almost all (93%) of the variability occurs at the intrapopulation level, but the greatest among-group differentiation (6-8%) was found when we grouped in a single population all Native Americans plus Siberian Eskimos and Chukchi and compared them with Mongolians. This result is compatible with earlier mtDNA and Y-chromosome suggestions of a single origin for the first colonizers of the American continent. With this nuclear locus it was not possible to broadly distinguish between Central and South American natives. No evidence of selection or marked demographic changes was obtained with these data.
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Ikeda H, Andou A, Mitani H, Tsuji K. [Successful removal of an intrapulmonary aberrant needle under video-assisted thoracoscopic surgery; report of a case]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 2005; 58:407-9. [PMID: 15881242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Intrapulmonary aberrant needles are rare in clinical practice. We report the successful removal of intrapulmonary aberrant needle. A 59-year-old man, though he was asymptomatic, was referred to our department after an abnormal shadow had been detected on a chest X-ray. Chest X-ray and chest computed tomography (CT) showed a foreign body suspected to be a metal artifact in the left upper lobe. It was diagnosed as an intrapulmonary aberrant needle and an operation under video-assisted thoracoscopic surgery was performed. Using perioperative fluoroscopy, we could confirm the location of the needle and remove it successfully. An intrapulmonary aberrant needle should be removed surgically, even if the patient is asymptomatic, due to the development of lung abscess or pyothorax and the risk containing harmful matter to health.
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Gotoh A, Sameshima S, Tsuji K, Matsumoto T, Miura T. Apoptotic wing degeneration and formation of an altruism-regulating glandular appendage (gemma) in the ponerine ant Diacamma sp. from Japan (Hymenoptera, Formicidae, Ponerinae). Dev Genes Evol 2005; 215:69-77. [PMID: 15647944 DOI: 10.1007/s00427-004-0456-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2004] [Accepted: 11/21/2004] [Indexed: 12/06/2022]
Abstract
We here show an example of morphological novelties, which have evolved from insect wings into the specific structures controlling social behaviour in an ant species. Most ant colonies consist of winged queen(s) and wingless workers. In the queenless ponerine ant Diacamma sp. from Japan, however, all female workers have a pair of small thoracic appendages, called "gemmae", which are homologous to the forewings and acts as an organ regulating altruism expression. Most workers, whose gemmae are clipped off by other colony members, become nonreproductive helpers, while only a single individual with complete gemmae becomes functionally reproductive. We examined histologically the development of gemmae, and compared it with that of functional wings in males. Female larvae had well-developed wing discs for both fore- and hindwings. At pupation, however, the wing discs started to evaginate and later degenerate. The hindwing discs completely degenerated, while the degeneration of forewing discs was incomplete, leading to the formation of gemmae. The degeneration process involved apoptotic cell death as confirmed by TUNEL assay. In addition, glandular cells differentiated from the epithelial cells of the forewing buds after completion of pupation. The mechanism of developmental transition from wing to gemma can be regarded as an evolutionary gain of new function, which can be seen in insect appendages and vertebrate limbs.
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Hasegawa D, Manabe A, Kubota T, Kawasaki H, Ohtsuka Y, Isomura M, Kojima S, Tsuji K, Nakahata T. P-88 Methylation status of the P15 and P16 genes in pediatric myelodysplastic syndrome and juvenile myelomonocytic leukemia. Leuk Res 2005. [DOI: 10.1016/s0145-2126(05)80152-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kando M, Masuda S, Zhidkov A, Yamazaki A, Kotaki H, Kondo S, Homma T, Kanazawa S, Nakajima K, Hayashi Y, Mori M, Kiriyama H, Akahane Y, Inoue N, Ueda H, Nakai Y, Tsuji K, Yamamoto Y, Yamakawa K, Koga J, Hosokai T, Uesaka M, Tajima T. Electron acceleration by a nonlinear wakefield generated by ultrashort (23-fs) high-peak-power laser pulses in plasma. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2005; 71:015403. [PMID: 15697651 DOI: 10.1103/physreve.71.015403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2004] [Indexed: 05/24/2023]
Abstract
We study experimentally the interaction of the shortest at present (23-fs) , relativistically intense (20-TW), tightly focused laser pulses with underdense plasma. MeV electrons constitute a two-temperature distribution due to different plasma wave-breaking processes at a plasma density of 10(20) cm(-3). These two groups of electrons are shown numerically to constitute bunches with very distinctive time durations.
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Miyamoto N, Tsuji K, Sakurai Y, Nishimori H, Kang JH, Mitsui S, Maguchi H. Percutaneous radiofrequency ablation for unresectable large hepatic tumours during hepatic blood flow occlusion in four patients. Clin Radiol 2004; 59:812-8. [PMID: 15351246 DOI: 10.1016/j.crad.2004.03.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2003] [Revised: 02/26/2004] [Accepted: 03/02/2004] [Indexed: 10/26/2022]
Abstract
AIM To evaluate percutaneous radiofrequency (RF) ablation therapy for unresectable large hepatic tumours combined with regional interruption of hepatic blood flow, and to assess the safety and efficacy of this procedure. MATERIALS AND METHODS Four patients with hepatic tumours were enrolled in this study. Patients were treated by a single session of RF ablation during occlusion of both hepatic artery and hepatic vein. Tumour size ranged from 45-57 mm (mean 50.2 mm). Initial therapeutic efficacy was evaluated with helical computed tomography (CT) performed within 9 days after the treatment. CT or magnetic resonance imaging (MRI) was performed every 2-3 months thereafter. RESULTS The largest axis of coagulated lesions after the ablation was 50-60 mm (mean 56.5 mm) in diameter. The ablation therapy was considered complete in three patients; after a mean follow-up of 12.7 months, CT and MRI revealed complete destruction of their tumours. One patient required further treatment. No severe complications occurred. CONCLUSION Although further studies are needed, in this limited clinical trial a local ablation area exceeding 50 mm in diameter was achieved safely.
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Hayakawa Y, Horii R, Tsuji K, Doi H. Phantom experiments for measuring elasticity of breast cancer by the echo technique. Breast Cancer Res 2004. [PMCID: PMC3300398 DOI: 10.1186/bcr857] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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100
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Bevrani H, Mitani Y, Tsuji K. Robust decentralised load-frequency control using an iterative linear matrix inequalities algorithm. ACTA ACUST UNITED AC 2004. [DOI: 10.1049/ip-gtd:20040493] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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