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Tamakuma Y, Yamada R, Suzuki T, Kuroki T, Saga R, Mizuno H, Sasaki H, Iwaoka K, Hosoda M, Tokonami S. COMPARATIVE STUDY ON PERFORMANCE OF VARIOUS ENVIRONMENTAL RADIATION MONITORS. Radiat Prot Dosimetry 2019; 184:307-310. [PMID: 31330024 DOI: 10.1093/rpd/ncz104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 04/07/2019] [Indexed: 06/10/2023]
Abstract
After the Fukushima Daiichi Nuclear Power Plant accident, the radiation dose for first responders was not evaluated accurately due to lack of the monitoring data. It has been important to evaluate a radiation dose for workers in emergency response at a nuclear accident. In this study, a new device which can evaluate both of external and internal exposure doses was developed and the performance of various environmental radiation monitors including commercially available monitors were tested and compared from the viewpoint of an environmental monitoring at emergency situation. Background counts of the monitors and the ambient dose equivalent rate were measured in Fukushima Prefecture. The detection limit for beta particles was evaluated by the method of ISO11929. The sensitivity for gamma-rays of the dust monitor using a ZnS(Ag) and a plastic scintillator was high, but that of the external exposure monitor using a silicon photodiode with CsI(Tl) crystal was relatively low. The detection limit ranged 190-280 Bq m-3 at 100 μSv h-1, exceeding the detection limit of 100 Bq m-3 in the minimum requirement by the National Regulation Authority in Japan. Use of the shielding with lead is necessary to achieve the minimum requirement. These results indicate that the dust monitor using a ZnS(Ag) scintillator and a plastic scintillator is suitable for the external exposure monitor and the developed internal exposure monitor is for the internal exposure monitor at emergency situation among the evaluated monitors. In the future study, the counting efficiency, the relative uncertainty and the performance of the detection for alpha particles will be evaluated, and it will be considered which type of a monitor is suitable after taking the portability into account.
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Affiliation(s)
- Y Tamakuma
- Departmenet of Radiation Sciences, Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori, Japan
| | - R Yamada
- Departmenet of Radiation Sciences, Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori, Japan
| | - T Suzuki
- Departmenet of Radiation Sciences, Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori, Japan
| | - T Kuroki
- Fuji Electric Co. Ltd., 11-2 Osaki, Shinagawa, Tokyo, Japan
| | - R Saga
- Fuji Electric Co. Ltd., 11-2 Osaki, Shinagawa, Tokyo, Japan
| | - H Mizuno
- Fuji Electric Co. Ltd., 11-2 Osaki, Shinagawa, Tokyo, Japan
| | - H Sasaki
- Fuji Electric Co. Ltd., 11-2 Osaki, Shinagawa, Tokyo, Japan
| | - K Iwaoka
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba, Japan
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori, Japan
| | - M Hosoda
- Departmenet of Radiation Sciences, Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori, Japan
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori, Japan
| | - S Tokonami
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori, Japan
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Kamo H, Miyamoto N, Tanaka R, Ueno Y, Watanabe M, Kurita N, Hira K, Shimada Y, Kuroki T, Yamashiro K, Urabe T, Hattori N. Analysis for usefulness of worsen score; The predicting score for the deterioration of acute ischemic stroke. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kurita N, Yamashiro K, Kuroki T, Tanaka R, Ueno Y, Urabe T, Nomoto K, Takahashi T, Tsuji H, Asahara T, Yamashiro Y, Hattori N. Gut dysbiosis induces lipopolysaccharide-mediated inflammation after cerebral ischemia in type 2 diabetic mice. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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4
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Ogawa T, Kajimoto Y, Kuroki T, Eguchi H, Hattori N, Miwa H. Secondary cervical dystonia associated with Opalski’s syndrome following acute medullary infarction: A possible relationship between the lateral-caudal medulla and cervical dystonia. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kuroki T, Tanaka R, Shimada Y, Yamashiro K, Ueno Y, Shimura H, Urabe T, Hattori N. Exendin-4 inhibits MMP-9 activation and reduces infarct growth after focal cerebral ischemia in hyperglycemic mice. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ishiguro Y, Kuroki T, Eguchi H, Machida Y, Hattori N, Miwa H. Pseudogout as a complication of acute ischemic stroke. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Tamai S, Tanaka C, Abe T, Kuroki T, Ishikawa J. Preparation and Properties of Optically Clear Poly[(Arylenedioxy)(Diphenylsilylene)]s and Poly[(Alkylenedioxy)(Diphenylsilylene)]. HIGH PERFORM POLYM 2016. [DOI: 10.1177/0954008303015003011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Several types of poly[(arylenedioxy)(diphenylsilylene)]s and poly[(alkylenedioxy)(diphenylsilylene)] were synthesized from various diols and dichlorodiphenylsilane by the step polymerization method. The thermal properties, solubility in organic solvents and optical properties of the obtained polymers were investigated by focusing on the chemical structures of their repeating structural units. The weight-average molecular weight ( Mw) of the obtained polymers based on polystyrene ranged from 43000 to 194000. High molecular weight, ductile materials with a high degree of optical clarity were obtained. These polymers display glass transition temperatures ( Tg) between 96 and 130°C. The obtained poly[(arylenedioxy) (diphenylsilylene)]s and poly[(alkylenedioxy)(diphenylsilylene)] were soluble in chloroform and toluene. The refractive index ( nd) was 1.64 for a biphenol-based poly[(arylenedioxy)(diphenylsilylene)] and 1.61 for a bisphenol-A based poly[(arylenedioxy)(diphenylsilylene)]. The poly[(arylenedioxy)(diphenylsilylene)]s and poly[(alkylenedioxy)(diphenylsilylene)] display very low birefringence (Δ n) between 0.0005 and 0.0022. The 70 μm thick film transmission of bicyclohexanol-based poly[(alkylenedioxy)(diphenylsilylene)] was 91% at a 350 nm wavelength.
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Affiliation(s)
- S. Tamai
- Advanced Materials Group Materials Science Laboratory, Mitsui Chemicals Inc., 580-32 Nagaura, Sodegaura-City, Chiba 229-0265, Japan
| | - C. Tanaka
- Advanced Materials Group Materials Science Laboratory, Mitsui Chemicals Inc., 580-32 Nagaura, Sodegaura-City, Chiba 229-0265, Japan
| | - T. Abe
- Advanced Materials Group Materials Science Laboratory, Mitsui Chemicals Inc., 580-32 Nagaura, Sodegaura-City, Chiba 229-0265, Japan
| | - T. Kuroki
- Advanced Materials Group Materials Science Laboratory, Mitsui Chemicals Inc., 580-32 Nagaura, Sodegaura-City, Chiba 229-0265, Japan
| | - J. Ishikawa
- Advanced Materials Group Materials Science Laboratory, Mitsui Chemicals Inc., 580-32 Nagaura, Sodegaura-City, Chiba 229-0265, Japan
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Sakimura C, Eguchi S, Yamanouchi K, Minami S, Kuba S, Hayashida N, Soyama A, Hidaka M, Takatsuki M, Maeda S, Kuroki T. The first report of the thyroid function of haemophilic patients with HIV/HCV co-infection in Japan. Haemophilia 2016; 22:e130-3. [PMID: 27167093 DOI: 10.1111/hae.12930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/21/2016] [Indexed: 11/28/2022]
Abstract
INTRODUCTION A high incidence of thyroid dysfunction is reported in patients with HIV or HCV mono-infection. We have conducted a periodic medical examination including the thyroid function for haemophilic patients with HIV/HCV co-infection due to contaminated blood products. METHODS We examined the thyroid function (as assessed by the FT3, FT4 and TSH levels) in 45 haemophilic patients, including thyroglobulin and auto-antibody, antithyroglobulin antibody, antithyroid peroxidase antibody and anti-TSH receptor antibody in 28 patients. RESULTS All the patients were males (median age: 42 years; range: 29-66). The median values of thyroid function were FT3 3.36 pg mL(-1) , FT4 1.125 ng mL(-1) and TSH 1.65 μIU mL(-1) . Five patients (11.1%) had high TSH levels. In 28 patients in whom the presence of auto-antibodies was examined, the median age was 47 years of age. The median value of thyroglobulin was 16 ng mL(-1) and two patients showed high levels of thyroglobulin. The presence of anti-TSH receptor antibody of all the patients was negative, but one patient (3.5%) was positive of antithyroid peroxidase antibody and antithyroglobulin antibody. CONCLUSIONS Since 0.68-3.6% of the general healthy population is reported to show hypothyroidism, our data showed that the proportion of hypothyroidism in haemophilic patients with HIV/HCV co-infection was more frequent than that of the normal population.
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Affiliation(s)
- C Sakimura
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - S Eguchi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - K Yamanouchi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - S Minami
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - S Kuba
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - N Hayashida
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - A Soyama
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - M Hidaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - M Takatsuki
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - S Maeda
- National Hospital Nagasaki Medical Center, Omura, Japan
| | - T Kuroki
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
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Soyama A, Takatsuki M, Hidaka M, Adachi T, Kitasato A, Kinoshita A, Natsuda K, Baimakhanov Z, Kuroki T, Eguchi S. Hybrid procedure in living donor liver transplantation. Transplant Proc 2015; 47:679-82. [PMID: 25891710 DOI: 10.1016/j.transproceed.2015.02.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 02/15/2015] [Accepted: 02/25/2015] [Indexed: 01/07/2023]
Abstract
BACKGROUND We have previously reported a hybrid procedure that uses a combination of laparoscopic mobilization of the liver and subsequent hepatectomy under direct vision in living donor liver transplantation (LDLT). We present the details of this hybrid procedure and the outcomes of the procedure. METHODS Between January 1997 and August 2014, 204 LDLTs were performed at Nagasaki University Hospital. Among them, 67 recent donors underwent hybrid donor hepatectomy. Forty-one donors underwent left hemihepatectomy, 25 underwent right hemihepatectomy, and 1 underwent posterior sectionectomy. First, an 8-cm subxiphoid midline incision was made; laparoscopic mobilization of the liver was then achieved with a hand-assist through the midline incision under the pneumoperitoneum. Thereafter, the incision was extended up to 12 cm for the right lobe and posterior sector graft and 10 cm left lobe graft procurement. Under direct vision, parenchymal transection was performed by means of the liver-hanging maneuver. The hybrid procedure for LDLT recipients was indicated only for selected cases with atrophic liver cirrhosis without a history of upper abdominal surgery, significant retroperitoneal collateral vessels, or hypertrophic change of the liver (n = 29). For total hepatectomy and splenectomy, the midline incision was sufficiently extended. RESULTS All of the hybrid donor hepatectomies were completed without an extra subcostal incision. No significant differences were observed in the blood loss or length of the operation compared with conventional open procedures. All of the donors have returned to their preoperative activity level, with fewer wound-related complaints compared with those treated with the use of the conventional open procedure. In recipients treated with the hybrid procedure, no clinically relevant drawbacks were observed compared with the recipients treated with a regular Mercedes-Benz-type incision. CONCLUSIONS Our hybrid procedure was safely conducted with the same quality as the conventional open procedure in both LDLT donors and recipients.
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Affiliation(s)
- A Soyama
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - M Takatsuki
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - M Hidaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - T Adachi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - A Kitasato
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - A Kinoshita
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - K Natsuda
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Z Baimakhanov
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - T Kuroki
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - S Eguchi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
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Kono T, Ro H, Murakami N, Kochi M, Kuroki T, Tosa Y, Yoshimoto S. Accessory auricles affecting the tragus and cheek occurring with cervical chondrocutaneous branchial remnants: A case report. JPRAS Open 2015. [DOI: 10.1016/j.jpra.2015.09.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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11
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Kugiyama T, Hidaka M, Soyama A, Takatsuki M, Natsuda K, Kinoshita A, Carpenter I, Adachi T, Kitasato A, Kuroki T, Eguchi S. E-cadherin expression in hepatocellular carcinoma treated with previous local treatment in patients undergoing living donor liver transplantation. Transplant Proc 2015; 47:700-2. [PMID: 25891714 DOI: 10.1016/j.transproceed.2015.02.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Revised: 02/14/2015] [Accepted: 02/25/2015] [Indexed: 12/01/2022]
Abstract
BACKGROUND The aim of this study was to evaluate the influence of previous local treatment on the E-cadherin (E-cad) expression in cases of hepatocellular carcinoma (HCC) after living donor liver transplantation (LDLT) within the Milan criteria. METHODS Seventy-four of 204 patients with HCC underwent LDLT between 1997 and 2014. Previous local treatment for HCC was performed for 121 lesions in 47 patients (47/74, 63.5%). Histological and immunohistochemical E-cad expression analyses were conducted on the basis of the whole-liver histological examination technique. RESULTS The interval to LDLT after the initial and last treatments was 24 months (2-206) and 10.5 months (1-58), respectively. Preoperative imaging showed necrosis in 92 (92/121, 76.0%) lesions caused by the effects of local treatment, whereas the histological examinations revealed viable HCC cells in 22 (22/92, 23.9%) lesions, demonstrating well or moderate differentiation without vascular invasion. Immunohistochemically, the expression of E-cad was maintained in 17 viable (17/22, 77.3%) lesions. There were no signs of malignant transformation or sarcomatous changes in the HCCs treated with previous therapy. The recipients who maintained an E-cad expression in the lesion with local treatment showed no recurrence or distant metastasis after LDLT. CONCLUSIONS HCC cells remained in approximately 20% of the evaluated lesions, even those exhibiting necrosis on imaging of the explanted cirrhotic liver. However, the expression of E-cad was maintained in most of these lesions. Furthermore, there were no significant differences in the rate of recurrence after LDLT between the patients who did and those did not receive previous local treatment for HCC.
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Affiliation(s)
- T Kugiyama
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - M Hidaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - A Soyama
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - M Takatsuki
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - K Natsuda
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - A Kinoshita
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - I Carpenter
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - T Adachi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - A Kitasato
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - T Kuroki
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - S Eguchi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
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Takaori M, Kuroki T. Preoperative hemodilution for autotransfusion. Bibl Haematol 2015:270-8. [PMID: 7337666 DOI: 10.1159/000402236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Yamanouchi K, Minami S, Kuba S, Sakimura C, Hayashida N, Kawakami F, Kuroki T, Eguchi S. Evaluation of the operative methods for Graves' disease. MINERVA CHIR 2015; 70:77-81. [PMID: 25312017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
AIM In Japan, surgery for Graves' disease (GD), which is considered to be a radical therapy, has been restricted by various guidelines. Nevertheless, some patients benefit from surgery. We sought to identify a reasonable operative method for GD by comparing the efficacy and safety among patients undergoing different extents of thyroidectomy. METHODS A total of 162 patients underwent thyroidectomy for GD between 2003 and 2012 in our department. We compared the clinical factors among those who underwent subtotal thyroidectomy (ST), near-total thyroidectomy (NTT), and total thyroidectomy (TT). RESULTS The ST, NTT, and TT groups included 111, 21, and 30 patients, respectively. The patient sex, period between disease onset and surgery, and preoperative thyroidal function were not substantially different among the three groups. With regard to surgical variables, the duration of surgery, amount of blood loss, and postoperative length of hospitalization were not substantially different among the three groups. Postoperative recurrent laryngeal nerve (RLN) palsy was transient in all cases, but the rate was significantly higher in the TT group compared to the other two groups (P<0.001). The incidences of transient hypocalcemia and permanent hypoparathyroidism were not substantially different among the groups. The proportion of patients who required the postoperative administration of levothyroxine was significantly lower in the ST group compared to the TT and NTT groups. Hyperthyroidism recurrence was noted in eight patients in the ST group (7.2%). CONCLUSION NTT for GD is thus considered to be a reasonable operative method regarding both efficacy and safety.
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Affiliation(s)
- K Yamanouchi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan -
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Kuba S, Yamanouchi K, Sakimura C, Kawakami F, Minami S, Fujita F, Takatsuki M, Kobayashi K, Kanetaka K, Kuroki T, Eguchi S. Total Versus Hemithyroidectomy for Well Differentiated Thyroid Cancer. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu340.49] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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15
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Affiliation(s)
- K Kume
- Third Department of Internal Medicine, University of Occupational and Environmental Health, Japan, School of Medicine, Kitakyusyu, Japan.
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Kuroki T, Ikeda S, Okada T, Maoka T, Kitamura A, Sugimoto M, Kume S. Astaxanthin ameliorates heat stress-induced impairment of blastocyst development in vitro:--astaxanthin colocalization with and action on mitochondria--. J Assist Reprod Genet 2013; 30:623-31. [PMID: 23536152 DOI: 10.1007/s10815-013-9987-z] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 03/18/2013] [Indexed: 11/28/2022] Open
Abstract
PURPOSE The effects of astaxanthin (Ax) on the in vitro development of bovine embryos cultured under heat stress were investigated in combination with the assessment of its cellular accumulation and action on mitochondrial membrane potential (ΔΨm). METHODS Bovine ≥8-cell embryos were collected on day 3 after in vitro fertilization and exposed to single (day 4) or repeated (day 4 and 5) heat stress (10 h/day at 40.5 °C). Ax was added into culture medium under the repeated heat stress and blastocyst development was evaluated. The cellular uptake of Ax in embryos was examined using bright-field and confocal laser-scanning microscopy, and high-performance liquid chromatography. The relationship between Ax and mitochondria localization was assessed using MitoTracker dye. The effects of Ax on ΔΨm were investigated using JC-1 dye. RESULTS Blastocyst development in the repeated heat stress treatment decreased significantly (P < 0.05) compared with those in single heat stress or normal thermal treatment. The addition of Ax into culture medium did lead to a significant recovery in blastocyst development in the repeated heat-treated group. Ax was detected in cytoplasm of embryos and observed to colocalize with mitochondria. Ax recovered ΔΨm in embryos that was decreased by the heat treatment. CONCLUSIONS Ax ameliorated the heat stress-induced impairment of blastocyst development. Our results suggest that the direct action of Ax on mitochondrial activity via cellular uptake is a mechanism of the ameliorating effects.
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Affiliation(s)
- T Kuroki
- Laboratory of Animal Physiology and Functional Anatomy, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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Okubo M, Fujishima H, Yamato Y, Kuroki T, Tanaka A, Otsuka K. Towards Ideal NOx and CO2 Emission Control Technology for Bio-Oils Combustion Energy System Using a Plasma-Chemical Hybrid Process. ACTA ACUST UNITED AC 2013. [DOI: 10.1088/1742-6596/418/1/012115] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hidaka M, Takatsuki M, Soyama A, Tanaka T, Muraoka I, Hara T, Kuroki T, Kanematsu T, Eguchi S. Intraoperative portal venous pressure and long-term outcome after curative resection for hepatocellular carcinoma. Br J Surg 2012; 99:1284-9. [PMID: 22864890 DOI: 10.1002/bjs.8861] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Outcomes of liver resection for hepatocellular carcinoma (HCC) have improved owing to better surgical techniques and patient selection. Portal hypertension may influence outcome but the preoperative definition and role of portal hypertension are far from clear. The aim of this study was to elucidate the influence of portal venous pressure (PVP) measured directly during surgery on outcomes of liver resection in patients with HCC. METHODS Patients who had resection of HCC between 1997 and 2009, and who underwent direct measurement of PVP immediately after laparotomy were enrolled. These patients were divided into groups with high (at least 20 cmH(2)O) and low (less than 20 cmH(2)O) PVP. The influence of PVP on overall and recurrence-free survival was analysed and prognostic factors were identified. RESULTS A total of 177 patients were enrolled, 129 in the low-PVP group and 48 in the high-PVP group. The 5-year overall survival rate (63·7 versus 31 per cent; P < 0·001) and recurrence-free survival rate (52·5 versus 12 per cent; P < 0·001) were significantly higher in patients with low PVP. In multivariable analysis, two or more tumours, tumour diameter at least 5 cm, high PVP, grade B liver damage and Hepatic Activity Index (HAI) grade 7 or more were significant predictors of poorer survival after liver resection. Two or more tumours, tumour diameter at least 5 cm and HAI grade 7 or more were significant predictors of poorer recurrence-free survival. CONCLUSION High PVP was associated with poor long-term outcome after liver resection for HCC.
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Affiliation(s)
- M Hidaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Japan
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Nakamura D, Yoshimitsu M, Kawada H, Inoue H, Kuroki T, Kaieda T, Fujino S, Hamada H, Suzuki S, Matsushita K, Uozumi K, Arima N. Recombinant human soluble thrombomodulin for the treatment of hepatic sinusoidal obstructive syndrome post allogeneic hematopoietic SCT. Bone Marrow Transplant 2011; 47:463-4. [DOI: 10.1038/bmt.2011.103] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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20
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Iida T, Kato M, Komiyama O, Suzuki H, Asano T, Kuroki T, Kaneda T, Svensson P, Kawara M. Comparison of cerebral activity during teeth clenching and fist clenching: a functional magnetic resonance imaging study. Eur J Oral Sci 2010; 118:635-41. [DOI: 10.1111/j.1600-0722.2010.00784.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kosaka T, Tajima Y, Kuroki T, Mishima T, Adachi T, Tsuneoka N, Fukuda K, Kanematsu T. Helicobacter bilis colonization of the biliary system in patients with pancreaticobiliary maljunction. Br J Surg 2010; 97:544-9. [PMID: 20155791 DOI: 10.1002/bjs.6907] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Helicobacter bilis is considered to be a causative factor in the pathogenesis of biliary cancer. This study investigated the prevalence of H. bilis colonization of the biliary system of patients with pancreaticobiliary maljunction (PBM). METHODS Bile juice and biliary tissue samples were collected from 17 patients with PBM and 27 controls who had benign biliary disease without PBM. DNA extracted from each biliary sample was subjected to polymerase chain reaction (PCR) analysis for H. bilis and Helicobacter pylori. RESULTS PCR assays revealed that 12 of the 17 patients with PBM were positive for H. bilis DNA, compared with eight of 27 patients without PBM (P = 0.009). Among patients with PBM, H. bilis DNA was identified in six of eight children, including a 2-month-old infant, and in six of nine adults. The high prevalence of H. bilis DNA in the biliary system of patients with PBM was independent of age, sex, common bile duct dilatation, configuration of the pancreatic and bile ducts, and amylase activity in bile. CONCLUSION H. bilis colonization of the biliary system is extremely common in patients with PBM. This may point to a role in the pathogenesis of biliary cancer.
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Affiliation(s)
- T Kosaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8501, Japan.
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Kosaka T, Tajima Y, Kuroki T, Mishima T, Adachi T, Tsuneoka N, Fukuda K, Kanematsu T. Helicobacter bilis colonization of the biliary system in patients with pancreaticobiliary maljunction. Br J Surg 2010. [PMID: 20155791 DOI: 10.1002/bjs6907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Helicobacter bilis is considered to be a causative factor in the pathogenesis of biliary cancer. This study investigated the prevalence of H. bilis colonization of the biliary system of patients with pancreaticobiliary maljunction (PBM). METHODS Bile juice and biliary tissue samples were collected from 17 patients with PBM and 27 controls who had benign biliary disease without PBM. DNA extracted from each biliary sample was subjected to polymerase chain reaction (PCR) analysis for H. bilis and Helicobacter pylori. RESULTS PCR assays revealed that 12 of the 17 patients with PBM were positive for H. bilis DNA, compared with eight of 27 patients without PBM (P = 0.009). Among patients with PBM, H. bilis DNA was identified in six of eight children, including a 2-month-old infant, and in six of nine adults. The high prevalence of H. bilis DNA in the biliary system of patients with PBM was independent of age, sex, common bile duct dilatation, configuration of the pancreatic and bile ducts, and amylase activity in bile. CONCLUSION H. bilis colonization of the biliary system is extremely common in patients with PBM. This may point to a role in the pathogenesis of biliary cancer.
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Affiliation(s)
- T Kosaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8501, Japan.
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23
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Kubota Y, Koizumi T, Udagawa A, Kuroki T. Prevention of tourniquet pain by subcutaneous injection into the posterior half of the axilla. J Plast Reconstr Aesthet Surg 2008; 61:595-7. [PMID: 18342592 DOI: 10.1016/j.bjps.2007.08.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2007] [Revised: 08/12/2007] [Accepted: 08/14/2007] [Indexed: 10/22/2022]
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Ohmori T, Hosaka T, Ishida H, Ando K, Okuda K, Hirose T, Horichi N, Adachi M, Saijo N, Kuroki T. 548 POSTER Active mutant epidermal growth factor receptor undergoes less protein degradation due to diminished binding to c-Cbl ubiquitin ligase. EJC Suppl 2006. [DOI: 10.1016/s1359-6349(06)70553-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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25
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Tajima Y, Tomioka T, Ikematsu Y, Yamanaka S, Kuroki T, Kitajima T, Fukuda K, Tsuneoka N, Kitazato A, Adachi T, Kanematsu T. Experimental study on pathogenesis and histomorphology of early carcinoma of the extrahepatic bile duct in the Syrian hamster. J Exp Clin Cancer Res 2005; 24:475-82. [PMID: 16270535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
To elucidate the pathogenesis of carcinomas in the extrahepatic bile duct, we investigated the histomorphological characteristics of adenomas and early carcinomas induced in the extrahepatic bile duct of hamsters. Syrian hamsters underwent a cholecystoduodenostomy along with a dissection of the common duct, while also being administered N-nitrosobis(2-oxopropyl)amine (BOP). The tumors that arose from the extrahepatic bile duct included 10 adenomas and 55 early carcinomas in 56 of the 156 hamsters sacrificed. All the adenomas were found to be polypoid in shape. The early carcinomas, which were restricted within the mucosal layer of the bile duct, showed the following three different growth patterns: (1) protruding type in 41 (75%), consisting of 27 polypoid and 14 papillary tumors; (2) superficial spreading type in 9 (16%); and (3) periductal glandular type in 5 (9%). There were no depressed tumors observed. Carcinomas existing either alone or associated with adenomas were evident in 12 (22%) tumors, and 11 of these were polypoid. Atypical papillary hyperplasia within the tumor mass was noted in 22 early carcinomas (40%) and was particularly prominent in papillary type tumors. These results support the concept of an adenoma-carcinoma sequence in the majority of polypoid tumors of the extrahepatic bile duct. Atypical papillary hyperplasia might also be premalignant, and these precursor lesions should reflect the growth patterns of tumors, at least in the early stage of tumorigenesis.
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Affiliation(s)
- Y Tajima
- Dept. of Transplantation and Digestive Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
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26
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Masamoto I, Arimura K, Matsushita K, Kuroki T, Uozumi K, Arima N. P-27 Quantitative and easy evaluationof apoptosis using Annexin-V by flow cytometry in myelodysplastic syndrome. Leuk Res 2005. [DOI: 10.1016/s0145-2126(05)80091-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Takahashi H, Kuroki T, Watanabe Y, Tanaka H, Inouye H, Yamai S, Watanabe H. Characterization of Neisseria meningitidis isolates collected from 1974 to 2003 in Japan by multilocus sequence typing. J Med Microbiol 2004. [DOI: 10.1099/0022-1317-53-11-1175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Tajima Y, Kuroki T, Fukuda K, Tsuneoka N, Furui J, Kanematsu T. An intraductal papillary component is associated with prolonged survival after hepatic resection for intrahepatic cholangiocarcinoma. Br J Surg 2004; 91:99-104. [PMID: 14716802 DOI: 10.1002/bjs.4366] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND The outcome after surgery for intrahepatic cholangiocarcinoma (ICC) is dismal and data on long-term survival are not available. This study evaluated prognostic indicators and characteristic features of long-term survivors after hepatic resection for ICC. METHODS Thirty-one patients who had undergone hepatic resection for ICC were studied. Univariate and multivariate survival analyses of clinicopathological data included an intraductal papillary carcinoma component (IDPCC) in the tumour, which was defined as the histological demonstration of cancer cells growing in a papillary fashion into the lumen of the large bile duct. RESULTS The overall cumulative survival rate after hepatic resection for ICC was 51.2 per cent at 1 year and 24.5 per cent at 5 years, with a mean(s.d.) survival time of 11(4) months. The presence of IDPCC (P = 0.003), curative resection (P = 0.009) and the absence of perineural invasion (P = 0.040) were identified as favourable independent prognostic factors in multivariate analysis. Eight patients with IDPCC had a 5-year survival rate of 87.5 per cent and a mean(s.d.) survival time of 69(13) months. All seven patients who survived for more than 5 years after surgery had IDPCC, regardless of the gross appearance of the tumour. CONCLUSION An IDPCC in the tumour resulted in long-term survival after hepatic resection for ICC.
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Affiliation(s)
- Y Tajima
- Department of Surgery II, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
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Vidal S, Horvath E, Kovacs K, Kuroki T, Lloyd RV, Scheithauer BW. Expression of hypoxia-inducible factor-1alpha (HIF-1alpha) in pituitary tumours. Histol Histopathol 2003; 18:679-86. [PMID: 12792878 DOI: 10.14670/hh-18.679] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The present study was performed to investigate HIF-1alpha (hypoxia-inducible factor-1alpha) expression in a large number of immunohistochemically and ultrastructurally characterized surgically removed pituitary tumours. The potential relation of HIF-1alpha with outcome variables as well as the presence of HIF-1alpha expression in the tumours treated with dopamine agonists and octreotide, a long-acting somatostatin analogue was also investigated. HIF-1alpha immunoreactivity was confined to the nucleoplasm whereas the nucleoli were unconspicuous. The distribution of HIF-1alpha was evident in the tumours whereas normal adenohypophysial cells showed no HIF-1alpha staining. HIF-1alpha expression was detected not only in the tumour cells but also in endothelial cells lining the blood vessels within the tumour. ACTH producing adenomas showed the lowest level of HIF-1alpha expression whereas pituitary carcinomas and GH producing adenomas had the highest counts. The statistical study demonstrated no significant correlation between HIF-1alpha expression, patient age, gender, tumour, size, invasiveness, cell proliferation rate and vascularity. These results suggest that the behaviour of pituitary tumours does not primarily depend of HIF-1alpha expression. Our study demonstrated an increase HIF-1alpha expression in bromocriptine treated PRL producing pituitary adenomas compared with untreated tumours but no increase in octreotide treated tumours.
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Affiliation(s)
- S Vidal
- Department of Anatomy, Laboratory of Histology, University of Santiago de Compostela, Lugo, Spain
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30
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Nakahara T, Kuroki T, Ohta E, Kajihata T, Yamada H, Yamanaka M, Hashimoto K, Tsutsumi T, Hirano M, Uchimura H. Effect of the neurotoxic dose of methamphetamine on gene expression of parkin and Pael-receptors in rat striatum. Parkinsonism Relat Disord 2003; 9:213-9. [PMID: 12618056 DOI: 10.1016/s1353-8020(02)00052-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We previously reported that haloperidol, a dopamine-D(2) receptor antagonist, induced striatal expression of parkin gene, which mutations cause autosomal recessive juvenile parkinsonism. Because of an involvement of the parkin gene defect in selective degeneration of dopaminergic neurons, we herein examined the effect of the neurotoxic dose of methamphetamine (METH; 40 mg/kg, i.p.) on gene expression of parkin and its substrate Pael-receptor (R) in the dopamine-rich areas of the rat brain, using reverse transcription-polymerase chain reaction. parkin mRNA levels in the striatum, but not in other regions, decreased at 1 and 2 h and returned to the pre-drug basal levels at 4 h after METH administration. METH also decreased Pael-R mRNA levels in the striatum and substantia nigra within 2 h after METH, while haloperidol (2 mg/kg, s.c.) increased Pael-R mRNA levels in the substantia nigra at 2 h after administration. These results suggest that temporary suppression of gene expression of parkin and Pael-R may be associated with the METH-induced dopaminergic neurotoxicity. Taken together with our previous report, dopaminergic modulation of the expression of parkin and Pael-R genes in the nigro-striatal pathway may have significant implication for pathophysiology and treatment of parkinson disease.
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Affiliation(s)
- T Nakahara
- Department of Chemistry, Faculty of Science, Kyushu University, Ropponmatsu, Fukuoka 810-8560, Japan.
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Endo H, Utani A, Matsumoto F, Kuroki T, Yoshimoto S, Ichinose M, Shinkai H. A possible paracrine hedgehog signalling pathway in neurofibromas from patients with neurofibromatosis type 1. Br J Dermatol 2003; 148:337-41. [PMID: 12588389 DOI: 10.1046/j.1365-2133.2003.05178.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Hedgehogs (Hhs) and their receptors are involved in organ development as well as in tumorigenesis observed in basal cell carcinoma. Among Hhs, Desert hedgehog secreted from Schwann cells mediates the formation of peripheral nerve sheaths. However, there has been no study on the role of Hhs and their receptors in tumorigenesis of neurofibromas in neurofibromatosis type 1 (NF1). OBJECTIVES To clarify the expression and localization of Hhs and their receptors in neurofibromas of NF1 patients. METHODS Expression of Hhs and their receptors was studied by immunohistochemistry using neurofibromas from NF1 patients and control normal skin samples. RESULTS In neurofibromas, CD57-positive tumour cells with delicate elongated processes were positive for the receptor PTCH2. Perineurial cells of involved nerves within neurofibromas as well as those of normal cutaneous nerves expressed Indian hedgehog and Sonic hedgehog. Schwann cells of normal cutaneous nerves were positive for PTCH2. CONCLUSIONS Our study suggests that a paracrine Hh signalling pathway may be involved in tumorigenesis of neurofibromas in NF1.
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Affiliation(s)
- H Endo
- Department of Clinical Biology of Extracellular Matrix, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan.
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Abstract
During a search for causative genes in patients with concurrent multiple primary colon tumours, we found a novel case with a germline mutation of the p53 gene, from GCC (Ala) to GTC (Val) at codon 189. Of the six primary colon tumours that this patient had, one large advanced carcinoma exhibited a somatic p53 mutation and a somatic APC mutation, in addition to the germline p53 mutation. Two early carcinomas and three adenomas had somatic APC mutations but no somatic p53 mutation or loss of the p53 allele. K-ras-2 mutations were detected in an advanced carcinoma and an early carcinoma. The present results suggest that a patient with a certain type of germline p53 mutation is predisposed to concurrent multiple colon tumours. It is also suggested that in such a patient, a somatic APC mutation is involved in tumour formation and that an additional somatic p53 mutation contributes to tumour progression.
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Affiliation(s)
- M Miyaki
- Hereditary Tumor Research Project, Tokyo Metropolitan Komagome Hospital, Tokyo, Japan
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Tamai S, Kamada J, Ono T, Kuroki T, Goto K, Yamaguchi A. Synthesis of photoreactive polyimide having indan structure. ACTA ACUST UNITED AC 2002. [DOI: 10.1002/pola.10124] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Wakino S, Kintscher U, Liu Z, Kim S, Yin F, Ohba M, Kuroki T, Schönthal AH, Hsueh WA, Law RE. Peroxisome proliferator-activated receptor gamma ligands inhibit mitogenic induction of p21(Cip1) by modulating the protein kinase Cdelta pathway in vascular smooth muscle cells. J Biol Chem 2001; 276:47650-7. [PMID: 11598137 DOI: 10.1074/jbc.m108719200] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The cyclin-dependent kinase inhibitor p21(Cip1) is up-regulated in response to mitogenic stimulation in various cells. PPARgamma ligands troglitazone (TRO, 10 microm) and rosiglitazone (RSG, 10 microm) attenuated the induction of p21(Cip1) protein by platelet-derived growth factor (PDGF) and insulin without affecting cognate mRNA levels in rat aortic smooth muscle cells (RASMC). The protein kinase Cdelta (PKCdelta) inhibitor rottlerin also blocked the induction of p21(Cip1) protein, whereas the conventional PKC isotype inhibitor Gö 6976 had no effect. Kinetic studies using the protein synthesis inhibitor cycloheximide showed that TRO, RSG, and rottlerin shortened the half-life of p21(Cip1) protein. TRO, RSG, and rottlerin inhibited PDGF-induced expression of p21(Cip1), but they did not affect insulin-induced expression of p21(Cip1). Both ligands inhibited PKCdelta enzymatic activity in PDGF-stimulated RASMC but not in insulin-stimulated cells. Adenovirus-mediated overexpression of PKCdelta rescued the down-regulation of p21(Cip1) expression both by TRO and RSG in PDGF-treated RASMC. These data suggested that the PKCdelta pathway plays a critical role in PDGF-induced expression of p21(Cip1) in RASMC and may be the potential target for PPARgamma ligand effects. Src kinase-dependent tyrosine phosphorylation of PKCdelta was decreased substantially by TRO and RSG. Tyrosine phosphorylation and activation of c-Src in response to PDGF were unaffected by either PPARgamma ligand. Protein-tyrosine-phosphatase inhibitors sodium orthovanadate and dephostatin prevented PPARgamma ligand effects on PKCdelta tyrosine phosphorylation and enzymatic activity. Both inhibitors also reversed PPARgamma ligand effects on p21(Cip1) expression in PDGF-treated RASMC. PPARgamma ligands enhanced protein-tyrosine-phosphatase activity in RASMC, which may be the mechanism for decreased PKCdelta tyrosine phosphorylation and activity. PPARgamma ligands regulate p21(Cip1) at a post-translational level by blocking PKCdelta signaling and accelerating p21(Cip1) turnover.
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MESH Headings
- Acetophenones/pharmacology
- Adenoviridae/genetics
- Animals
- Aorta, Thoracic/cytology
- Apoptosis
- Benzopyrans/pharmacology
- Blotting, Western
- Carbazoles/pharmacology
- Cell Division
- Cells, Cultured
- Chromans/pharmacology
- Cyclin-Dependent Kinase Inhibitor p21
- Cyclins/metabolism
- Cycloheximide/pharmacology
- Dose-Response Relationship, Drug
- Down-Regulation
- Enzyme Inhibitors/pharmacology
- Hydroquinones/pharmacology
- Indoles/pharmacology
- Insulin/metabolism
- Isoenzymes/metabolism
- Kinetics
- Ligands
- Mice
- Mitogens/pharmacology
- Models, Biological
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/enzymology
- Phosphorylation
- Platelet-Derived Growth Factor/pharmacology
- Precipitin Tests
- Protein Kinase C/metabolism
- Protein Kinase C-delta
- Protein Processing, Post-Translational
- Protein Synthesis Inhibitors/pharmacology
- Protein Tyrosine Phosphatases/antagonists & inhibitors
- RNA/metabolism
- Rats
- Rats, Sprague-Dawley
- Receptors, Cytoplasmic and Nuclear/metabolism
- Recombinant Proteins/metabolism
- Rosiglitazone
- Signal Transduction
- Thiazoles/pharmacology
- Thiazolidinediones
- Time Factors
- Transcription Factors/metabolism
- Troglitazone
- Tyrosine/metabolism
- Up-Regulation
- Vanadates/pharmacology
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Affiliation(s)
- S Wakino
- Division of Endocrinology, Diabetes, and Hypertension, School of Medicine, 142-8555 UCLA, 900 Veteran Ave., Los Angeles, CA 90095, USA
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35
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Kuroki T, Tashiro N. [Clinical and pharmacological studies of the second generation antipsychotics]. Fukuoka Igaku Zasshi 2001; 92:365-9. [PMID: 11813688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/17/2023]
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36
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Braiman L, Alt A, Kuroki T, Ohba M, Bak A, Tennenbaum T, Sampson SR. Activation of protein kinase C zeta induces serine phosphorylation of VAMP2 in the GLUT4 compartment and increases glucose transport in skeletal muscle. Mol Cell Biol 2001; 21:7852-61. [PMID: 11604519 PMCID: PMC99955 DOI: 10.1128/mcb.21.22.7852-7861.2001] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Insulin stimulates glucose uptake into skeletal muscle tissue mainly through the translocation of glucose transporter 4 (GLUT4) to the plasma membrane. The precise mechanism involved in this process is presently unknown. In the cascade of events leading to insulin-induced glucose transport, insulin activates specific protein kinase C (PKC) isoforms. In this study we investigated the roles of PKC zeta in insulin-stimulated glucose uptake and GLUT4 translocation in primary cultures of rat skeletal muscle. We found that insulin initially caused PKC zeta to associate specifically with the GLUT4 compartments and that PKC zeta together with the GLUT4 compartments were then translocated to the plasma membrane as a complex. PKC zeta and GLUT4 recycled independently of one another. To further establish the importance of PKC zeta in glucose transport, we used adenovirus constructs containing wild-type or kinase-inactive, dominant-negative PKC zeta (DNPKC zeta) cDNA to overexpress this isoform in skeletal muscle myotube cultures. We found that overexpression of PKC zeta was associated with a marked increase in the activity of this isoform. The overexpressed, active PKC zeta coprecipitated with the GLUT4 compartments. Moreover, overexpression of PKC zeta caused GLUT4 translocation to the plasma membrane and increased glucose uptake in the absence of insulin. Finally, either insulin or overexpression of PKC zeta induced serine phosphorylation of the GLUT4-compartment-associated vesicle-associated membrane protein 2. Furthermore, DNPKC zeta disrupted the GLUT4 compartment integrity and abrogated insulin-induced GLUT4 translocation and glucose uptake. These results demonstrate that PKC zeta regulates insulin-stimulated GLUT4 translocation and glucose transport through the unique colocalization of this isoform with the GLUT4 compartments.
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Affiliation(s)
- L Braiman
- Faculty of Life Sciences, Gonda-Goldschmied Center, Bar-Ilan University, Ramat-Gan 52900, Israel
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Yagita K, Izumiyama S, Tachibana H, Masuda G, Iseki M, Furuya K, Kameoka Y, Kuroki T, Itagaki T, Endo T. Molecular characterization of Cryptosporidium isolates obtained from human and bovine infections in Japan. Parasitol Res 2001; 87:950-5. [PMID: 11728022 DOI: 10.1007/s004360100480] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Cryptosporidium oocysts, morphologically identified as Cryptosporidium parvum, were isolated from 22 human and 14 bovine cases in Japan, and were genotyped by means of a PCR/RFLP analysis of the polythreonine gene. DNA profiles of human isolates gave three distinct genotypes, namely an anthroponotic genotype 1, zoonotic genotype 2 and a new genotype. Isolates from bovine samples gave zoonotic genotype 2. The unusual genotype of Cryptosporidium was isolated from the feces of three immunologically healthy adults, and was further characterized by the sequence analysis of the 18S rRNA gene. The third genotype was identified as Crypto sporidium meleagridis, demonstrating that C. meleagridis, which occurs worldwide, has the potential to infect humans regardless of their immunological condition.
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Affiliation(s)
- K Yagita
- Department of Parasitology, National Institute of Infectious Diseases, Tokyo, Japan
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Abstract
A comparative study chiefly of the recurrence rate of chronic subdural haematoma after two treatment modalities was conducted. Patients were divided into a burr hole strict closed-system drainage group (SCD group; n=56) and a burr hole closed-system drainage with irrigation group (CDI group; n=45). The burr hole strict closed-system drainage involved simply inserting a drainage tube into the haematoma cavity as quickly as possible after minimally incising the haematoma capsule. The introduction of air into the haematoma cavity was prevented, and irrigation was not performed. Symptoms in both groups disappeared soon after surgery, with no postoperative complications. Haematoma recurred in one patient (1.8%) of the SCD group compared with 5 (11.1%) of the CDI group. The rate of recurrence was significantly lower for the SCD than for the CDI group (p<0.05). In 4 of 5 recurrences in the CDI group, the volume of residual intracapsular air was sufficient after initial surgery. These results suggested that postoperative residual intracapsular air is a factor contributing to recurrence. Burr hole strict closed-system drainage is a simple, less invasive procedure with which to treat chronic subdural haematoma and the outcome is excellent. Furthermore, prevention of intracapsular air intrusion during surgery might help prevent recurrence.
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Affiliation(s)
- T Kuroki
- Department of Neurosurgery, Sakura Hospital, Toho University School of Medicine, Chiba, Japan
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Niino YS, Irie T, Takaishi M, Hosono T, Huh N, Tachikawa T, Kuroki T. PKCtheta II, a new isoform of protein kinase C specifically expressed in the seminiferous tubules of mouse testis. J Biol Chem 2001; 276:36711-7. [PMID: 11470790 DOI: 10.1074/jbc.m104348200] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Protein kinase C (PKC) theta, a Ca(2+)-independent isoform of PKC, has been known to be expressed in skeletal muscle and T cells. In the present study, we isolated and characterized a smaller transcript expressed in the mouse testis, the cDNA of which is referred hereafter as PKCthetaII and the original PKCtheta as PKCthetaI. The cDNA clone of PKCthetaII has 2184 base pairs and 464 amino acids in the possible open reading frame, consisting of the 5' unique sequence of 20 amino acids and the PKCthetaI sequence of 444 amino acids. Genomic DNA analysis revealed that transcription of PKCthetaII is initiated from the PKCthetaII-specific exon, which is located between exons 7 and 8 of the PKCtheta gene, indicating that alternative splicing is the mechanism by which PKCthetaII is generated. PKCthetaII is expressed exclusively in the testis in an age-dependent manner with sexual maturation. In situ hybridization and reverse transcription-polymerase chain reaction of microdissected tissues clearly demonstrated that PKCthetaII is expressed in the seminiferous tubules of the mouse testis. Consistent with its molecular structure lacking the C1 regulatory domain, PKCthetaII is constitutively active as determined by an in vitro kinase assay, being independent of PKC activators, e.g. phosphatidylserine and phorbol ester. PKCthetaII may play a crucial role in spermatogenesis or some related function of the testis.
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Affiliation(s)
- Y S Niino
- Institute of Molecular Oncology, Department of Pathology, Faculty of Dentistry and Center for Biotechnology, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
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Miyaki M, Iijima T, Shiba K, Aki T, Kita Y, Yasuno M, Mori T, Kuroki T, Iwama T. Alterations of repeated sequences in 5' upstream and coding regions in colorectal tumors from patients with hereditary nonpolyposis colorectal cancer and Turcot syndrome. Oncogene 2001; 20:5215-8. [PMID: 11526511 DOI: 10.1038/sj.onc.1204578] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2001] [Revised: 04/12/2001] [Accepted: 04/30/2001] [Indexed: 11/09/2022]
Abstract
One of the characteristics of tumors from patients with germline mutations of DNA mismatch repair genes is instability at microsatellite regions (MSI). We analysed alterations at repeated sequences of coding regions, as well as those of 5' upstream regions, in 29 MSI-High colorectal tumors from patients with hereditary nonpolyposis colorectal cancer (HNPCC) and Turcot syndrome. We found that repeated sequences in 5' upstream regions were altered in these tumors, at considerable frequencies. The (A)10 repeat in the promoter region (position -178 to approximately -169) of the GAPDH gene was altered in 17% of the tumors. The (A)10(TA)9 in the 5' upstream region (position -318 to approximately -291) of the mitochondrial isoleucyl tRNA synthetase gene (IleRS-A), coded in nuclear DNA, was altered in 59% of the tumors, whereas (A)9 in the 5' upstream region (position -859 to approximately -851) of cytoplasmic isoleucyl tRNA synthetase gene (IleRS-B) was not altered. Alteration at repeated sequences in the coding regions were 72% at TGFbetaRII(A)10, 24% at IGFIIR(G)8, 45% at BAX(G)8, 55% at E2F4(CAG)13, 66% at caspase-5 (A)10, 31% at MBD4(A)10, 55% at hMSH3(A)8 and 34% at hMSH6(C)8. The number of altered genes increased with the advancement of carcinoma according to Dukes categories: mean numbers of altered genes within these 10 genes were 2.6 for Dukes A, 4.7 for Dukes B and 7.8 for Dukes C. The mean number for adenomas was 2.0. These results suggest that the MSI phenotype also causes alteration of 5' upstream regions which may affect apoptosis and some mitochondrial functions in HNPCC and Turcot tumors, and that accumulation of altered genes with repeated sequences is associated with the progression of HNPCC and Turcot colorectal tumors.
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Affiliation(s)
- M Miyaki
- Hereditary Tumor Research Project, Tokyo Metropolitan Komagome Hospital, Tokyo 113-8677, Japan.
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41
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Abstract
Functional somatic symptoms are highly associated with hypochondriasis, anxiety, and depressive disorders. Despite the absence of an organic disorder, underlying psychological distress of patients with functional somatic symptoms may result in abnormal illness behavior such as inadequate treatment seeking or overuse of medical services. Using the Illness Behavior Questionnaire (IBQ), we examined the illness behavior of Japanese patients visiting a general medicine clinic whose physical symptoms were considered functional. We used the General Health Questionnaire-30 to classify patients with functional somatic symptoms as those with and without psychological distress. Patients with distress (n=35) reported more physical complaints and higher IBQ scores than did patients without distress (n=22). The IBQ profile of patients with psychological distress was identical to that of patients diagnosed with either hypochondriasis or major depression. The illness behavior of patients without psychological distress was indistinguishable from that of patients whose physical symptoms were attributed to organic disease. These results further support the hypothesis that functional somatic symptoms may be associated with hypochondriasis and major depression, the pathology of which may contribute to the development of abnormal illness behavior.
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Affiliation(s)
- Y Guo
- Department of General Medicine, Saga Medical School, Nabeshima 5-1-1, Saga 849-8501, Japan.
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Shinohara H, Kayagaki N, Yagita H, Oyaizu N, Ohba M, Kuroki T, Ikawa Y. A protective role of PKCepsilon against TNF-related apoptosis-inducing ligand (TRAIL)-induced apoptosis in glioma cells. Biochem Biophys Res Commun 2001; 284:1162-7. [PMID: 11414705 DOI: 10.1006/bbrc.2001.5104] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
To elucidate the molecular mechanism(s) involved in the TRAIL-induced apoptosis sensitivity, we conducted the following experiments utilizing TRAIL-sensitive and -resistant glioma cells. We examined the expression of TRAIL receptors mRNA, but no significant differences were detected in those cells. TRAIL-resistant cells were sensitized to TRAIL-induced apoptosis by staurosporine pretreatment and preferentially expressed PKCepsilon. Since several lines of evidence suggest that PKC may play a protective role for apoptosis, we analyzed the involvement of PKCepsilon in TRAIL-induced apoptosis by an adenovirus vector expression system. We found that TRAIL susceptibility was augmented by the expression of a dominant negative PKCepsilon in TRAIL-resistant cells. Conversely, PKCepsilon introduction in TRAIL-sensitive cells resulted in the reduction of TRAIL-induced apoptosis. Taken together, these data suggest that PKCepsilon may be a regulator of susceptibility to TRAIL-induced apoptosis in gliomas and probably other malignancies.
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Affiliation(s)
- H Shinohara
- Department of Retroviral Regulation, Medical Research Division, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, 113-8519, Japan
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Abstract
Tumor growth depends on several factors, including angiogenesis. Tumors cannot grow if new vessels are not formed to supply the cells with oxygen and other nutrients and to remove waste products. Increased angiogenesis can be correlated with tumor growth and metastatic potential in many tumor types, indicating that neoformation of vessels is a prognostic indicator of tumor behavior. We evaluated microvessel densities in 157 various pituitary adenoma types and seven pituitary carcinomas using immunocytochemistry for CD-34 antigen, a reliable marker of endothelial cells. The lowest percentage of microvessel density was found in growth hormone-producing adenomas, the highest level in pituitary carcinomas. In general, no major correlation was found between MIB-1 index (an indicator of cell proliferation) and microvessel density. The statistical study also demonstrated no gender-dependent changes in the microvessel density of pituitary tumors. Although the microvessel density was not significantly different in relation to invasiveness of pituitary tumors, our results demonstrate a tendency of invasive pituitary tumors to be more highly vascularized than non-invasive ones. Dopamine agonist and long-acting somatostatin analog treatment compared with untreated tumors did not significantly affect microvessel densities. Statistical differences were demonstrated in the microvessel density of macroadenomas between patients older and patients younger than 40 years. Significant differences were also apparent in the microvessel densities between microadenomas and macroadenomas diagnosed in young patients but not in the older age group. The strongly positive correlation observed between microvessel density and age is consistent with the view that age of the host may have an influence on the extent of neovascularization of pituitary adenomas.
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Affiliation(s)
- S Vidal
- Department of Anatomy, Campus Universitario de Lugo, Spain.
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Alt A, Ohba M, Li L, Gartsbein M, Belanger A, Denning MF, Kuroki T, Yuspa SH, Tennenbaum T. Protein kinase Cdelta-mediated phosphorylation of alpha6beta4 is associated with reduced integrin localization to the hemidesmosome and decreased keratinocyte attachment. Cancer Res 2001; 61:4591-8. [PMID: 11389095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
In mammalian epidermis, expression of the alpha6beta4 integrin is restricted to the hemidesmosome complexes, which connect the proliferative basal cell layer with the underlying basement membrane. Keratinocyte differentiation is associated with down-regulation of alpha6beta4 expression and detachment of keratinocytes from the basement membrane. Neoplastic keratinocytes delay maturation, proliferate suprabasally, and retain the expression of the alpha6beta4 integrin in suprabasal cells disassociated from the hemidesmosomes. We now show that the alpha6beta4 integrin is a substrate for serine phosphorylation by protein kinase C in keratinocytes. Furthermore, protein kinase C-mediated phosphorylation of alpha6beta4 is associated with redistribution of this integrin from the hemidesmosome to the cytosol. Specifically, in vitro kinase assays identified the protein kinase Cdelta as the primary isoform phosphorylating alpha6 and beta4 integrin subunits. Using recombinant protein kinase C adenoviruses, overexpression of protein kinase Cdelta but not protein kinase Calpha in primary keratinocytes increased beta4 serine phosphorylation, decreased alpha6beta4 localization to the hemidesmosome complexes, and reduced keratinocyte attachment. Taken together, these results establish a link between protein kinase Cdelta-mediated serine phosphorylation of alpha6beta4 integrin and its effects on alpha6beta4 subcellular localization and keratinocyte attachment to the laminin underlying matrix.
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Affiliation(s)
- A Alt
- Faculty of Life Sciences, Bar Ilan University, Ramat-Gan 52900, Israel
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Fujimoto S, Yano Y, Nishiguchi S, Koh N, Tamori A, Shiomi S, Kuroki T, Otani S. Identification of genes differentially expressed by putrescine in HepG2 hepatoblastoma cells. Hepatol Res 2001; 20:207-215. [PMID: 11348855 DOI: 10.1016/s1386-6346(00)00138-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
In order to identify genes differentially expressed by putrescine, a polyamine, which play important roles in the regulation of cell proliferation and the development of cancer, we performed mRNA differential display analysis using total RNA extracted from HepG2 cells (human hepatoblastoma cell line) treated with a specific inhibitor of polyamine biosynthesis, alpha-difluorometylornithine (DFMO). A total of 25 genes were up-regulated and 32 genes down-regulated by putrescine. Of the genes differentially expressed by putrescine, we chose three that were related to the respiratory chain and oxidative phosphorylation and analyzed them by Northern blot analysis. Cytochrome oxidase subunit 1, low molecular mass ubiquinone-binding protein, and NADH dehydrogenase subunit 2 were found to be down-regulated by putrescine. We examined intracellular ATP level in HepG2 cells, and found that ATP level in DFMO-treated cells was increased by exogenous putrescine.
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Affiliation(s)
- S Fujimoto
- Department of Biochemistry, Osaka City University Medical School, Asahimachi, Abeno-ku, 545-8585, Osaka, Japan
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Inoguchi T, Yu HY, Imamura M, Kakimoto M, Kuroki T, Maruyama T, Nawata H. Altered gap junction activity in cardiovascular tissues of diabetes. Medical Electron Microscopy 2001; 34:86-91. [PMID: 11685657 DOI: 10.1007/s007950170002] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2001] [Accepted: 07/06/2001] [Indexed: 10/27/2022]
Abstract
Hyperglycemia appears to be an important etiologic factor in the development of micro- and macrovascular complications in diabetic patients. However, its detailed molecular mechanism remains unclear. Among various possible mechanisms, it is widely accepted that high glucose level and a diabetic state induce protein kinase C (PKC) activation in vascular cells in cultured and vascular tissues of diabetic animals. Gap junctions are clusters of membrane channels that permit the intercellular exchange of ions and second messengers between adjacent cells. Gap junctional intercellular communication (GJIC) plays an important role in cardiovascular tissue homeostasis. Here we report that GJIC in cultured vascular cells such as endothelial cells and smooth muscle cells is inhibited by high glucose level. Furthermore, we show that it is mediated by PKC-dependent excessive phosphorylation of connexin-43 which is the main functional component of gap junction in vascular cells. In addition, we also show that in diabetic rats, PKC-dependent excessive phosphorylation of connexin-43 induces the impairment of ventricular conduction in the heart. These results suggest that PKC-dependent impairment of GJIC may lead to various disorders of cardiovascular homeostasis and contribute to cardiovascular dysfunctions associated with diabetes.
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Affiliation(s)
- T Inoguchi
- Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
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Kubo S, Nishiguchi S, Hirohashi K, Tanaka H, Shuto T, Yamazaki O, Shiomi S, Tamori A, Oka H, Igawa S, Kuroki T, Kinoshita H. Effects of long-term postoperative interferon-alpha therapy on intrahepatic recurrence after resection of hepatitis C virus-related hepatocellular carcinoma. A randomized, controlled trial. Ann Intern Med 2001; 134:963-7. [PMID: 11352697 DOI: 10.7326/0003-4819-134-10-200105150-00010] [Citation(s) in RCA: 215] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Interferon therapy decreases the incidence of hepatocellular carcinoma in patients with chronic hepatitis C. OBJECTIVE To evaluate effects of interferon-alpha on recurrence after resection of hepatitis C virus-related hepatocellular carcinoma. DESIGN Randomized, controlled trial. SETTING University hospital, medical center, and affiliated hospital in Osaka, Japan. PATIENTS 30 men were randomly allocated after resection to the interferon-alpha group (n = 15) or the control group (n = 15). INTERVENTION Patients in the interferon-alpha group received interferon-alpha, 6 MIU intramuscularly daily for 2 weeks, then three times weekly for 14 weeks, and finally twice weekly for 88 weeks. MEASUREMENTS Recurrence rates after resection. RESULTS Recurrent tumors were detected in 5 patients in the interferon-alpha group and in 12 control patients. The recurrence rate was significantly lower in the interferon-alpha group than in the control group (P = 0.037). CONCLUSION Postoperative interferon-alpha therapy appears to decrease recurrence after resection of hepatitis C virus-related hepatocellular carcinoma.
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Affiliation(s)
- S Kubo
- Second Department of Surgery, Osaka City University Medical School, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan
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48
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Liu YF, Paz K, Herschkovitz A, Alt A, Tennenbaum T, Sampson SR, Ohba M, Kuroki T, LeRoith D, Zick Y. Insulin stimulates PKCzeta -mediated phosphorylation of insulin receptor substrate-1 (IRS-1). A self-attenuated mechanism to negatively regulate the function of IRS proteins. J Biol Chem 2001; 276:14459-65. [PMID: 11278339 DOI: 10.1074/jbc.m007281200] [Citation(s) in RCA: 152] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Incubation of rat hepatoma Fao cells with insulin leads to a transient rise in Tyr phosphorylation of insulin receptor substrate (IRS) proteins. This is followed by elevation in their P-Ser/Thr content, and their dissociation from the insulin receptor (IR). Wortmannin, a phosphatidylinositol 3-kinase (PI3K) inhibitor, abolished the increase in the P-Ser/Thr content of IRS-1, its dissociation from the IR, and the decrease in its P-Tyr content following 60 min of insulin treatment, indicating that the Ser kinases that negatively regulate IRS-1 function are downstream effectors of PI3K. PKCzeta fulfills this criterion, being an insulin-activated downstream effector of PI3K. Overexpression of PKCzeta in Fao cells, by infection of the cells with adenovirus-based PKCzeta construct, had no effect on its own, but it accelerated the rate of insulin-stimulated dissociation of IR.IRS-1 complexes and the rate of Tyr dephosphorylation of IRS-1. The insulin-stimulated negative regulatory role of PKCzeta was specific and could not be mimic by infecting Fao cells with adenoviral constructs encoding for PKC alpha, delta, or eta. Because the reduction in P-Tyr content of IRS-1 was accompanied by a reduced association of IRS-1 with p85, the regulatory subunit of PI3K, it suggests that this negative regulatory process induced by PKCzeta, has a built-in attenuation signal. Hence, insulin triggers a sequential cascade in which PI3K-mediated activation of PKCzeta inhibits IRS-1 functions, reduces complex formation between IRS-1 and PI3K, and inhibits further activation of PKCzeta itself. These findings implicate PKCzeta as a key element in a multistep negative feedback control mechanism of IRS-1 functions.
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Affiliation(s)
- Y F Liu
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 76100, Israel
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49
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Matsumoto M, Ogawa W, Hino Y, Furukawa K, Ono Y, Takahashi M, Ohba M, Kuroki T, Kasuga M. Inhibition of insulin-induced activation of Akt by a kinase-deficient mutant of the epsilon isozyme of protein kinase C. J Biol Chem 2001; 276:14400-6. [PMID: 11278835 DOI: 10.1074/jbc.m011093200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Akt, also known as protein kinase B, is a protein-serine/threonine kinase that is activated by growth factors in a phosphoinositide (PI) 3-kinase-dependent manner. Although Akt mediates a variety of biological activities, the mechanisms by which its activity is regulated remain unclear. The potential role of the epsilon isozyme of protein kinase C (PKC) in the activation of Akt induced by insulin has now been examined. Expression of a kinase-deficient mutant of PKCepsilon (epsilonKD), but not that of wild-type PKCepsilon or of kinase-deficient mutants of PKCalpha or PKClambda, with the use of adenovirus-mediated gene transfer inhibited the phosphorylation and activation of Akt induced by insulin in Chinese hamster ovary cells or L6 myotubes. Whereas the epsilonKD mutant did not affect insulin stimulation of PI 3-kinase activity, the phosphorylation and activation of Akt induced by a constitutively active mutant of PI 3-kinase were inhibited by epsilonKD, suggesting that epsilonKD affects insulin signaling downstream of PI 3-kinase. PDK1 (3'-phosphoinositide-dependent kinase 1) is thought to participate in Akt activation. Overexpression of PDK1 with the use of an adenovirus vector induced the phosphorylation and activation of Akt; epsilonKD inhibited, whereas wild-type PKCepsilon had no effect on, these actions of PDK1. These results suggest that epsilonKD inhibits the insulin-induced phosphorylation and activation of Akt by interfering with the ability of PDK1 to phosphorylate Akt.
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Affiliation(s)
- M Matsumoto
- Second Department of Internal Medicine, Kobe University School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan
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Braiman L, Alt A, Kuroki T, Ohba M, Bak A, Tennenbaum T, Sampson SR. Insulin induces specific interaction between insulin receptor and protein kinase C delta in primary cultured skeletal muscle. Mol Endocrinol 2001; 15:565-74. [PMID: 11266508 DOI: 10.1210/mend.15.4.0612] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Certain protein kinase C (PKC) isoforms, in particular PKCs beta II, delta, and zeta, are activated by insulin stimulation. In primary cultures of skeletal muscle, PKCs beta II and zeta, but not PKC delta, are activated via a phosphatidylinositol 3-kinase (PI3K)-dependent pathway. The purpose of this study was to investigate the possibility that PKC delta may be activated upstream of PI3K by direct interaction with insulin receptor (IR). Experiments were done on primary cultures of newborn rat skeletal muscle, age 5--6 days in vitro. The time course of insulin-induced activation of PKC delta closely paralleled that of IR. Insulin stimulation caused a selective coprecipitation of PKC delta with IR, and these IR immunoprecipitates from insulin-stimulated cells displayed a striking induction of PKC activity due specifically to PKC delta. To examine the involvement of PKC delta in the IR signaling cascade, we used recombinant adenovirus constructs of wild-type (W.T.) or dominant negative (D.N.) PKC delta. Overexpression of W.T.PKC delta induced PKC delta activity and coassociation of PKC delta and IR without addition of insulin. Overexpression of D.N.PKC delta abrogated insulin- induced coassociation of PKC delta and IR. Insulin-induced tyrosine phosphorylation of IR was greatly attenuated in cells overexpressing W.T.PKC delta, whereas in myotubes overexpressing D.N.PKC delta, tyrosine phosphorylation occurred without addition of insulin and was sustained longer than that in control myotubes. In control myotubes IR displayed a low level of serine phosphorylation, which was increased by insulin stimulation. In cells overexpressing W.T.PKC delta, serine phosphorylation was strikingly high under basal conditions and did not increase after insulin stimulation. In contrast, in cells overexpressing D.N.PKC delta, the level of serine phosphorylation was lower than that in nonoverexpressing cells and did not change notably after addition of insulin. Overexpression of W.T.PKC delta caused IR to localize mainly in the internal membrane fractions, and blockade of PKC delta abrogated insulin-induced IR internalization. We conclude that PKC delta is involved in regulation of IR activity and routing, and this regulation may be important in subsequent steps in the IR signaling cascade.
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Affiliation(s)
- L Braiman
- Faculty of Life Sciences, Gonda-Goldschmied Center Bar-Ilan University, Ramat-Gan 52900, Israel
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