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Irie T, Kigawa J, Minagawa Y, Oishi T, Takahashi M, Shimada M, Kamazawa S, Sato S, Terakawa N. Alteration of a p53 gene status affects outcome of patients with recurrent ovarian cancer. Oncology 2000; 58:237-41. [PMID: 10765126 DOI: 10.1159/000012106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The aim of this longitudinal study was to examine whether and how the p53 gene is altered in patients with recurrent ovarian cancer and to determine the significance of p53 mutation in recurrent tumors. The primary and recurrent tumors were examined in 15 patients who had recurrent epithelial ovarian cancer, and whose primary tumor contained a wild-type p53 gene. The interval between cytoreductive surgery and the appearance of recurrence ranged from 5. 2 to 63.6 months (mean 23.4 months). Mutations in the p53 gene were screened by polymerase chain reaction single strand conformation polymorphism analysis and determined by cycle sequencing. Mutation of the p53 gene in the recurrent tumor was found in 7 of the 15 patients (46.7%). Estimated 3- and 5-year survival rates were 57.1 and 0%, respectively, for patients with p53 gene mutation detected in the recurrence tumor, and 75.0% and 37.5% for patients without the mutation (p = 0.0155). The interval between cytoreductive surgery and the appearance of recurrence did not differ between those groups (549.7 +/- 102.2 vs. 832.9 +/- 283.8 days). Mean survival time after recurrence was significantly better in the patients without mutation (438.6 +/- 56.4 vs. 873.0 +/- 157.5 days, p = 0.0125). The present study suggests that p53 gene mutation frequently occurs in recurrent ovarian cancer and that alteration of p53 gene status affects salvage chemotherapy. This phenomenon affects the prognosis of recurrent disease and may predict outcome.
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Irie T, Kajitani M, Yoshioka H, Matsueda K, Inaba Y, Arai Y, Nakajima K, Nozawa K, Itai Y. CT fluoroscopy for lung nodule biopsy: a new device for needle placement and a phantom study. J Vasc Interv Radiol 2000; 11:359-64. [PMID: 10735432 DOI: 10.1016/s1051-0443(07)61430-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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78
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Irie T, Ohdaira E, Ide M, Itoh K, Nagai H. Improved detection of echo signals from inside bone. ULTRASONICS 2000; 38:698-702. [PMID: 10829755 DOI: 10.1016/s0041-624x(99)00161-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The purpose of the study was to obtain useful information for diagnosing internal abnormalities of bones by ultrasound. We fabricated a transmitting and receiving system mainly targeting the bone and an image processing system using a computer, and studied the attenuation of ultrasound in animal bone (in vitro). The average value was about 37 dB. The examination was able to determine successfully the proper dynamic range for detection, and a B-mode image of the inside of the bone could be displayed. Here we describe a new transmitting and receiving system developed to improve the detection of echo signals from inside bones. In this method, two kinds of high sensitivity transducer were made as follows: (1) 5 HMz frequency, 6.5 mm diameter; (2) 10 HMz frequency, 13 mm diameter. By using this method, detectability of the echo signals can be increased more than with the former system. The results showed that the structure of the bones could be clearly seen in the B-mode images.
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79
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Honda Y, Matsuyama T, Irie T, Watanabe T, Kuwahara M. Carboxin resistance transformation of the homobasidiomycete fungus Pleurotus ostreatus. Curr Genet 2000; 37:209-12. [PMID: 10794179 DOI: 10.1007/s002940050521] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A novel selection marker gene for transformation of the white-rot basidiomycete Pleurotus ostreatus was developed by introducing a point mutation in a gene which encodes the iron-sulfur protein (Ip) subunit of succinate dehydrogenase. The mutant gene, CbxR, encodes a modified Ip subunit with an amino-acid substitution (His239 to Leu) and confers resistance to the systemic fungicide, carboxin. The DNA sequence was integrated ectopically in the chromosome of the transformants. This is the first report of a homologous marker gene which is available for the molecular breeding of an edible mushroom.
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80
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Sugahara S, Ohara K, Takahashi A, Irie T, Watanabe T, Tanaka N, Nozawa K, Nakajima K, Itai Y. Prognostic significance of the PC10 index for patients with stage II and III oesophageal cancer treated with radiotherapy. Acta Oncol 2000; 38:1057-62. [PMID: 10665763 DOI: 10.1080/028418699432365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
The monoclonal antibody PC10 is used for immunohistochemical staining of the proliferating cell nuclear antigen (PCNA). The percentage of PC10-positive cancer cells is defined as the PC10 index. We evaluated the relationship between the PC10 index in pretreatment endoscopic biopsies and the prognoses of 47 patients with Stage II-III oesophageal squamous cell carcinoma treated with radiotherapy. The patients with a PC10 index > 40% had significantly poorer prognoses than the other patients (p = 0.0007). Proportional hazards model analysis indicated that only the PC10 index was a prognostic factor (p = 0.0009). The patient group of complete responders showed significantly lower PC10 indices compared to patients with a partial response or no change (p = 0.049). The PC10 index can be a good predictive indicator of the prognosis in patients with Stage II-III oesophageal cancer treated with radiotherapy.
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81
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Irie T, Muta T, Takeshige K. TAK1 mediates an activation signal from toll-like receptor(s) to nuclear factor-kappaB in lipopolysaccharide-stimulated macrophages. FEBS Lett 2000; 467:160-4. [PMID: 10675530 DOI: 10.1016/s0014-5793(00)01146-7] [Citation(s) in RCA: 152] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Stimulation of monocytes/macrophages with lipopolysaccharide (LPS) results in activation of nuclear factor-kappaB (NF-kappaB), which plays crucial roles in regulating expression of many genes involved in the subsequent inflammatory responses. Here, we investigated roles of transforming growth factor-beta activated kinase 1 (TGF-TAK1), a mitogen-activated protein kinase kinase kinase (MAPKKK), in the LPS-induced signaling cascade. A kinase-negative mutant of TAK1 inhibited the LPS-induced NF-kappaB activation both in a macrophage-like cell line, RAW 264.7, and in human embryonic kidney 293 cells expressing toll-like receptor 2 or 4. Furthermore, we demonstrated that endogenous TAK1 is phosphorylated upon simulation of RAW 264.7 cells with LPS. These results indicate that TAK1 functions as a critical mediator in the LPS-induced signaling pathway.
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Irie T, Oshida T, Hasegawa H, Matsuoka Y, Li T, Oya Y, Tanaka T, Tsujimoto G, Kambara H. Automated DNA fragment collection by capillary array gel electrophoresis in search of differentially expressed genes. Electrophoresis 2000; 21:367-74. [PMID: 10675017 DOI: 10.1002/(sici)1522-2683(20000101)21:2<367::aid-elps367>3.0.co;2-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
An automatic DNA fragment collector using capillary array gel electrophoresis has been developed. A sheath flow technique is used for not only detection but also collection of DNA fragments. In a sheath flow cell, the DNA fragments separated by 16 capillaries flow independently into corresponding sampling capillaries. The fraction collector consists of 16 sampling trays and each sampling tray is set beneath each end of the sampling capillaries to collect the flow-through DNA fragments. Certain DNA fragments are automatically sorted by controlling the movement of the sampling trays according to the signals from the system. The collector experimentally separated two mixtures of polymerase chain reaction (PCR) products: one prepared by using eight different sizes (base lengths from 161 to 562) of DNAs; and the other prepared by a differential display (DD) method with cDNA fragments. Collected DNA fragments are amplified by PCR and measured by electrophoresis. DNA fragments with base length differences of one (base lengths 363 and 364) were successfully separated. A separated DNA fragment from the DD sample was also successfully sequenced. In addition, differentially expressed DNA fragments were automatically sorted by comparative analysis, in which two similar cDNA fragment groups, labeled by two different fluorophores, respectively, were analyzed in the same gel-filled capillary. These results show that the automatic DNA fragment collector is useful for gene hunting in research fields such as drug discovery and DNA diagnostics.
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83
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Sato Y, Yamazaki T, Yasukawa K, Kaneita Y, Mochimaru J, Hanai M, Irie T, Kura Y, Sawada U, Horie T. [Merocyanine 540-mediated photodynamic therapy inhibits P-glycoprotein (P-gp) activity in adriamycin-resistant K562 cells]. Gan To Kagaku Ryoho 1999; 26:2195-200. [PMID: 10635304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
The photosensitizing dye merocyanine 540 (MC540) has been used in preclinical models and in a phase I clinical trial in the U.S.A. for the extracorporeal purging of autologous bone marrow grafts contaminated with leukemia or lymphoma. In this communication, we report MC540-mediated photodynamic therapy (PDT) was effective in purging leukemic cells expressing P-gp. When K562 and K562/ADM were exposed to MC540 (15 micrograms/ml) and white light (145.8 kJ/m2), the concentration of K562 and K 562/ADR was reduced by 1.8 and 3.0 log, respectively. Using flow cytometry and confocal laser scan microscopy, MC540 and calcein-AM were bound intracellularly and effluxed by P-gp in K562/ADM. In K562/ADM, calcein-AM efflux was inhibited by P-gp modulator, cyclosporin A (5 microM) and verapamil (15 micrograms/ml). In contrast, MC540 efflux was inhibited by cyclosporin A but not verapamil. Furthermore, MC540-mediated PDT inhibited efflux of calcein-AM and MC540, and induced the accumulation of dyes in K562/ADM. We conclude that MC540 is a substrate of P-gp and that MC540-mediated PDT is useful for purging MDR cells through inhibition of P-gp activity.
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Maruyama M, Irie T, Yoshida T, Nagahama T, Sugano N, Ebuchi M. [Hemodynamics at hepatoarterial infusion of 5-FU in a chronic renal failure patient maintained by hemodialysis]. Gan To Kagaku Ryoho 1999; 26:2241-5. [PMID: 10635312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
The authors studied the hemodynamics of 5-FU hepatoarterial infusion in a colorectal cancer patient with multiple liver metastases, who had chronic renal failure maintained by hemodialysis. Under weekly high dose 5-FU hepatoarterial infusion (1,000 mg/m2, 5 hours), on a non-dialysis day, serum 5-FU concentration was 1,090 ng/ml just after the 5 h infusion, 391 ng/ml at 15 min, 217 ng/ml at 30 min, 47 ng/ml at 60 min, and < 4 ng/ml at 120 min after infusion. On a dialysis day it was 1,500 ng/ml just after infusion, 41 ng/ml at 15 min, 5 ng/ml at 30 min, and < 4 ng/ml at 60 and 120 min after infusion. A control group (n = 4), who had liver metastases from colorectal cancers and normal renal functions, showed 5-FU serum concentration of 987 +/- 384 ng/ml just after infusion, 226 +/- 117 ng/ml at 15 min, 18.5 +/- 5.8 ng/ml at 30 min, < 4 ng/ml at 60 and 120 min after infusion. The serum 5-FU concentration of the patient was maintained higher on non-dialysis days, while it decreased more rapidly on dialysis days than that of the control group. There were no clinical complications due to the weekly high dose 5-FU hepatoarterial infusion. Under the treatment of continuous 5-FU hepatoarterial infusion (500 mg/day), the serum 5-FU concentration of this patient was kept under 115 ng/ml. After hemodialysis, the concentration decreased. The serum 5-FU concentration of the control group (n = 4) was under 66 ng/ml. There were no side effects under the protocol of continuous 5-FU hepatoarterial infusion. 5-FU hepatoarterial infusion for liver metastasis was a safe treatment for a renal failure patient with hemodialysis.
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Sugahara S, Ohara K, Okumura T, Irie T, Nakajima K, Itai Y. [Patterns of initial treatment failure of esophageal cancer following radiotherapy]. NIHON IGAKU HOSHASEN GAKKAI ZASSHI. NIPPON ACTA RADIOLOGICA 1999; 59:754-9. [PMID: 10614106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Sixty patients with stage I-III esophageal squamous cell cancer treated by definitive radiotherapy (RT) were analyzed for patterns of treatment failure. Patients were treated by external RT alone (n = 45) or in combination with intraluminal RT (N = 15) when suitable, with prescribed total doses ranging from 59.4 to 104.4 Gy. Concurrent chemotherapy consisting of cisplatin and/or 5-fluorouracil was administered to 19 patients. The two-year actuarial survival rate and two-year disease-free survival rate were 29.5% and 18.3%, respectively. Two-year failure rates were 66.5%, 36.9%, and 3.8%, for the esophagus, lymph nodes, and other sites, respectively. Two-year esophageal failure rates for patients with T1-2 (n = 8), T3 (n = 30), and T4 disease (n = 22) were 14.3%, 64.7%, and 87.9%, respectively (p < 0.05). A multivariate analysis of esophageal failure with descriptive variables of T classification, tumor length, and performance of intraluminal RT revealed that only T classification was an independent factor (p = 0.021). Two-year lymph node failure rates were 24.8% and 33.6% for patients with N0 (n = 36) and N1 disease (n = 24), respectively (p = 0.0035). Lymph node failure in N0 patients was found exclusively outside the treatment field. These results suggest that inclusion of potential lymph node metastases in the radiation field could lessen the lymph node failure rate in T1-3N0M0 patients.
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86
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Maruyama M, Nagahama T, Ebuchi M, Irie T, Yoshida T, Kure M. [Experimental study on intraperitoneal and intravenous administration of anti-tumor agents for liver metastasis]. Gan To Kagaku Ryoho 1999; 26:1782-5. [PMID: 10560394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Intraperitoneal chemotherapy has been the treatment for peritoneal seedings. Most of the anti-tumor agent administered intraperitoneally is absorbed from visceral peritoneum, gets into the portal vein system and reaches the liver. Theoretically, intraperitoneal administration of anti-tumor agents must show equivalent effects on the liver metastasis to portal vein infusion. We compared the efficacy of intraperitoneal and intravenous administration of 5-FU, CDDP and CPT-11, using colon 26 mouse liver metastasis model. Intraperitoneal administration of 5-FU or CPT-11 was statistically superior to intravenous administration to diminish the liver metastatic deposits. CDDP experiment did not show a statistical difference, but the superiority intraperitoneal administration was recognized. Intraperitoneal administration of anti-tumor agents is more effective for not only peritoneal seedings but also liver metastases than intravenous administration. Intraperitoneal chemotherapy might be an effective adjuvant chemotherapy for gastrointestinal malignancies.
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87
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Shimada M, Kigawa J, Minagawa Y, Irie T, Takahashi M, Terakawa N. Significance of cytoreductive surgery including bowel resection for patients with advanced ovarian cancer. Am J Clin Oncol 1999; 22:481-4. [PMID: 10521063 DOI: 10.1097/00000421-199910000-00012] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The aim of this study was to determine the significance of bowel resection in advanced ovarian cancer. A total of 64 women with stage IIIc or IV epithelial ovarian cancer, who consecutively received primary treatment between 1991 and 1995, were entered in this prospective study. The outcome of the patients undergoing bowel resection was evaluated. Thirty-nine patients underwent cytoreductive surgery at initial surgery. Of them, 16 patients could undergo optimal operation without bowel resection. Twenty-three patients received bowel resection at initial surgery. Of these 23 patients, 16 underwent optimal operation and 7 did not. Among 25 patients judged as inoperable cases at initial surgery, 21 responded to chemotherapy and underwent second surgery. Of 21 patients receiving second surgery, 15 underwent optimal operation (7 without bowel resection and 8 with bowel resection). The 3-year survival rate for 24 patients undergoing optimal operation with bowel resection (46.8%) was not significantly different from that for 23 patients without bowel resection (59.1%). Postoperative complications were seen in 8 patients (21.6%) of the patients receiving bowel resection and 3 (13.0%) of those without bowel resection. Cytoreductive surgery including bowel resection is effective for an improvement of the survival in patients with advanced ovarian cancer, if an optimal operation can be performed.
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Nagahama T, Maruyama M, Irie T, Yoshida T, Kure N, Ebuchi M. [Pharmaco-dynamic study of methotrexate (MTX) during intraperitoneal MTX/5-FU sequential therapy after gastric surgery]. Gan To Kagaku Ryoho 1999; 26:1786-9. [PMID: 10560395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
A pharmaco dynamic study of Methotrexate (MTX) during intraperitoneal MTX/5-FU sequential therapy was carried out after gastric surgery. A comparative study of the route of MTX administration and its dose was also done. 1) Comparative study of the serum concentration of MTX between i.p. and i.v. administration revealed a similar MTX concentration except immediately after administration. 2) A comparative study of the serum concentration of MTX administered i.p. between patients with and without malignant ascites was conducted. Immediate elevation of the serum concentration of MTX was observed in patients without malignant ascites. On the other hand, the MTX concentration was slowly elevated and washed out in patients with malignant ascites. 3) The MTX concentration in the intraperitoneal fluid was compared between patient with and without malignant ascites. In patients without malignant ascites, MTX disappeared quickly from the intraperitoneal fluid. However, the MTX concentration lasted long in the malignant ascites cases. These results were similar with a low-dose MTX (30 mg/body) or moderate dose (100 mg/body). MTX/5-FU sequential i.p. therapy can thus be an effective treatment for patients after gastric surgery, though clearance of MTX was slow in cases with malignant ascites.
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Nagahama T, Maruyama M, Nakamura N, Irie T, Yoshida T, Kure N, Ebuchi M. [Intrabiliary administration of doxorubicin for pancreaticobiliary cancer]. Gan To Kagaku Ryoho 1999; 26:1849-52. [PMID: 10560410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
UNLABELLED The effect and drug absorbtion of intrabiliary chemotherapy with Doxorubicin for pancreaticobiliary cancer with PTCD was investigated. Doxorubicin (DXR: 20 mg) was administered intrabiliary for 3 hours by PTCD catheter. Radiographic evaluation of the bile duct before and after chemotherapy and measurement of DXR concentration in the serum and bile were carried out. RESULTS Intrabiliary administration of DXR was completed without any significant complications other than epigastric pain. Radiographic study of the bile duct of a patient with pancreatic cancer who could successfully complete DXR administration showed improvement of bile duct passage. The placement of biliary stent could be achieved. Concentration of DXR in the serum after administration was below the lowest determinable level while those in the bile maintained a considerably high concentration 4 hours after the administration. With negligible absorption from bile, intrabiliary chemotherapy with DXR was thought to be an acceptable palliative treatment for pancreaticobiliary cancer.
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Tokutake N, Hiratake J, Irie T, Yamano A, Oda J. The absolute configuration of an intermediate cyclic sulfoximine in the asymmetric synthesis of transition-state analog inhibitors of γ-glutamylcysteine synthetase. Acta Crystallogr C 1999. [DOI: 10.1107/s0108270198016436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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91
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Ganaha F, Yamada T, Yorozu N, Ujita M, Irie T, Fukuda Y, Fukuda K, Tada S. Vascular access system for continuous arterial infusion of a protease inhibitor in acute necrotizing pancreatitis. Cardiovasc Intervent Radiol 1999; 22:436-8. [PMID: 10501901 DOI: 10.1007/s002709900423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We used a vascular access system (VAS) for continuous arterial infusion (CAI) of a protease inhibitor in two patients with acute necrotizing pancreatitis. The infusion catheter was placed into the dorsal pancreatic artery in the first patient and into the gastroduodenal artery in the second, via a femoral artery approach. An implantable port was then connected to the catheter and was secured in a subcutaneous pocket prepared in the right lower abdomen. No complications related to the VAS were encountered. This system provided safe and uncontaminated vascular access for successful CAI for acute pancreatitis.
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92
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Okimoto K, Ohike A, Ibuki R, Aoki O, Ohnishi N, Rajewski RA, Stella VJ, Irie T, Uekama K. Factors affecting membrane-controlled drug release for an osmotic pump tablet (OPT) utilizing (SBE)(7m)-beta-CD as both a solubilizer and osmotic agent. J Control Release 1999; 60:311-9. [PMID: 10425336 DOI: 10.1016/s0168-3659(99)00077-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
PURPOSE The purpose of this study was to define membrane controlling factors responsible for drug release from a controlled-porosity osmotic pump tablet (OPT) that utilizes a sulfobutyl ether-beta-cyclodextrin, (SBE)(7m)-beta-CD, as both a solubilizing and osmotic agent. METHOD The OPT was spray coated with cellulose acetate solutions varying the amount and size of micronized lactose, the amount of triethyl citrate (TEC) and the composition ratio of dichlormethane to ethanol. Chlorpromazine (CLP) was used as a model drug. The release of CLP from the OPTs was studied using the Japanese Pharmacopoeia dissolution method. The membrane surface area of the OPTs were measured with multi-point analysis by the gas absorption method. RESULTS The release rate of CLP from OPTs containing (SBE)(7m)-beta-CD increased with increasing amounts of micronized lactose and decreasing amounts of TEC and lactose particle size in the membrane. Also, the CLP release rates from the spray-coated OPTs using mixtures of varying ratios of dichlormethane to ethanol were almost identical. The membrane surface area of the OPTs following release of membrane components had a linear relationship to CLP release rates from the OPTs. CONCLUSION The present results confirmed that the membrane controlling factors responsible for the drug release were the amount and size of micronized lactose and the amount of TEC in the membrane.
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Izumi K, Nakajima T, Maeda T, Irie T, Murata M, Saku T. Polypoid mass of the gingiva. ORAL SURGERY, ORAL MEDICINE, ORAL PATHOLOGY, ORAL RADIOLOGY, AND ENDODONTICS 1999; 88:117-21. [PMID: 10468450 DOI: 10.1016/s1079-2104(99)70102-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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94
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Kai Y, Miyako K, Muta T, Umeda S, Irie T, Hamasaki N, Takeshige K, Kang D. Mitochondrial DNA replication in human T lymphocytes is regulated primarily at the H-strand termination site. BIOCHIMICA ET BIOPHYSICA ACTA 1999; 1446:126-34. [PMID: 10395925 DOI: 10.1016/s0167-4781(99)00015-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The most unique feature in the replication of mitochondrial DNA (mtDNA) is that most of the newly synthesized heavy strands (H-strands) terminate prematurely, resulting in the formation of displacement loop (D-loop) strands. Only the H-strand which proceeds past the termination site is a true nascent H-strand leading to the overall replication on a circular mtDNA molecule. The physiological significance of the D-loop formation has long been unclear. To examine the role of premature termination in mtDNA replication, we therefore developed a method for selectively measuring both the total amount of nascent H-strands and the amount of true nascent H-strands using ligation-mediated polymerase chain reaction, which, for the first time, enabled us to estimate the frequency of premature termination. The stimulation of cell proliferation with interleukin 2 and phytohemagglutinin in human peripheral T lymphocytes caused an increase in the net replication rate of mtDNA. In stimulated cells, in comparison to resting ones, the amount of true nascent H-strands increased approx. 2.6-fold while the total amount of nascent H-strands remained unchanged, indicating that premature termination decreased while the initiation of replication remained the same. Our findings thus demonstrate the first clear example that premature termination plays a primary role in the up-regulation of the net rate of mtDNA replication in human cells.
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95
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Irie T, Kubushiro K, Suzuki K, Tsukazaki K, Umezawa K, Nozawa S. Inhibition of attachment and chemotactic invasion of uterine endometrial cancer cells by a new vinca alkaloid, conophylline. Anticancer Res 1999; 19:3061-6. [PMID: 10652593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
The effect of conophylline, a new vinca alkaloid that inhibits ras expression, on tumour cell adhesion and infiltration was evaluated using a human endometrial cancer cell line. When SNG-II, a highly differentiated human endometrial cancer cell line, was exposed to conophylline, the cells developed filamentous processes at concentrations which did not affect cell proliferation (0.03-0.3 microgram/ml). After exposure to conophylline (0.3 microgram/ml), cells adherent to matrigel- and type IV collagen-coated wells respectively decreased to 26.9% and 33.3% of the number in the untreated control culture (p < 0.01). In an in vitro invasion assay using a Boyden chamber, infiltration of cells exposed to conophylline decreased to 19.4% (0.3 microgram/ml) (p < 0.01) of the control. In a wound assay, conophylline inhibited the movement of cells at 24 hr after wounding. Flow cytometric analysis revealed that expression of integrin beta 1 was not altered by conophylline, but E-cadherin and CD44 were decreased. The expression of E-cadherin and CD44 could be changed by conophlline.
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96
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Shinotoh H, Namba H, Yamaguchi M, Fukushi K, Nagatsuka S, Iyo M, Asahina M, Hattori T, Tanada S, Irie T. Positron emission tomographic measurement of acetylcholinesterase activity reveals differential loss of ascending cholinergic systems in Parkinson's disease and progressive supranuclear palsy. Ann Neurol 1999; 46:62-9. [PMID: 10401781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
We measured brain acetylcholinesterase activity in 16 patients with Parkinson's disease (PD), 12 patients with progressive supranuclear palsy (PSP), and 13 age-matched controls, using N-methyl-4-[11C]piperidyl acetate and positron emission tomography. Kinetic analysis was performed to calculate k3, an index of acetylcholinesterase activity. In PD patients, there was a significant reduction (-17%) of cerebral cortical k3 compared with normal controls, whereas there was only a nonsignificant reduction (-10%) of cortical k3 in PSP patients. However, there was a prominent reduction (-38%) of thalamic k3 in PSP patients compared with normal controls, whereas there was only a nonsignificant reduction (-13%) of thalamic k3 in PD patients. The results suggest that there is a loss of cholinergic innervation to the cerebral cortex in association with cholinergic innervation to the thalamus in PD, whereas there is a preferential loss of cholinergic innervation to the thalamus in PSP. When the thalamic to cerebral cortical k3 ratio was taken for each subject, PD and PSP were separated, suggesting that positron emission tomography measurement of acetylcholinesterase activity may be useful for differentiating the two similar disorders.
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97
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Okimoto K, Ohike A, Ibuki R, Aoki O, Ohnishi N, Irie T, Uekama K, Rajewski RA, Stella VJ. Design and evaluation of an osmotic pump tablet (OPT) for chlorpromazine using (SBE)7m-beta-CD. Pharm Res 1999; 16:549-54. [PMID: 10227711 DOI: 10.1023/a:1018827214223] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
PURPOSE The purpose of this study was to develop a controlled-porosity osmotic pump tablet (OPT) which exhibits pH-independent release profiles for a basic drug using a sulfobutyl ether-beta-cyclodextrin, (SBE)7m-beta-CD, which acts as both a solubilizer and as an osmotic agent. METHODS Chlorpromazine free base (CLP) was chosen as a model drug for this study. The release of CLP from osmotic pump tablets was studied in vitro. In vivo absorption of CLP from the OPT was evaluated in male beagle dogs. RESULTS The CLP release profile from an OPT prepared from a core tablet composed of a 1:10 molar ratio of CLP to (SBE)7m-beta-CD was pH-independent, and was controlled by modulating the membrane thickness of the OPT. Another cyclodextrin, hydroxypropyl-beta-cyclodextrin (HP-beta-CD), and a sugar mixture of lactose and fructose resulted in pH-dependent release at the same molar ratio. An in vivo absorption study in dogs with an OPT containing (SBE)7m-beta-CD correlated very well with the in vitro release profiles using the Japanese Pharmacopoeia dissolution method. CONCLUSIONS In addition to serving as a solubilizer and osmotic agent, (SBE)7m-beta-CD can also serve as the controlling agent for pH independent release of CLP from OPTs. This system successfully modified the in vivo input rate of CLP without compromising oral bioavailability.
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98
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Miyake K, Irie T, Arima H, Hirayama F, Uekama K, Hirano M, Okamaoto Y. Characterization of itraconazole/2-hydroxypropyl-beta-cyclodextrin inclusion complex in aqueous propylene glycol solution. Int J Pharm 1999; 179:237-45. [PMID: 10053216 DOI: 10.1016/s0378-5173(98)00393-7] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The interaction of itraconazole, a triazole antifungal agent, with 2-hydroxypropyl-beta-cyclodextrin (HP-beta-CyD) in water and 10% v/v propylene glycol/water solution at pH 2.0 was investigated by the solubility method and ultraviolet and 1H-nuclear magnetic resonance (NMR) spectroscopies. The solubility of itraconazole in water significantly increased as the concentrations of HP-beta-CyD were augmented, showing an AP type phase solubility diagram. The upward curvature closely corresponded to the simulation curve which was calculated on the basis of the 1:2 (guest:host) complexation model. The 1:2 complex was formed even in the presence of 10% v/v propylene glycol, although the co-solvent system made the interaction with HP-beta-CyD weaker due to the competitive inclusion. The ultraviolet spectroscopic studies also supported the 1:2 complex formation of itraconazole with HP-beta-CyD in 10% v/v propylene glycol/water solution at pH 2.0. The 1H-NMR spectroscopic studies suggested that the triazole and triazolone moieties of itraconazole are involved in the 1:2 inclusion complexation.
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99
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Yagyu K, Kitagawa K, Irie T, Hattori N, Omori K, Inagaki C. Lithium decreases Cl--ATPase activity and increases intracellular Cl- concentration in cultured rat hippocampal neurons. Brain Res 1999; 821:530-4. [PMID: 10064842 DOI: 10.1016/s0006-8993(99)01132-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Under the conditions of stimulated phosphatidylinositol turnover (0. 1 mM carbachol plus 20 mM KCl), LiCl (0.1-10 mM) reduced the activity of Cl--ATPase in cultured rat hippocampal neurons without affecting Na+/K+- or anion-insensitive Mg2+-ATPase. This inhibition of Cl--ATPase was attenuated by the addition of 0.5 mM inositol to culture media. The intracellular Cl- concentrations of the LiCl-treated neurons increased in an inositol-sensitive manner.
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100
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Irie T, Itai Y, Hatsuse K, Mochizuki H. Does resection of small liver metastases from colorectal cancer improve survival of patients? Br J Radiol 1999; 72:246-9. [PMID: 10396213 DOI: 10.1259/bjr.72.855.10396213] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Because the size of metastases greatly affects their detection, we retrospectively investigated the influence of the size of liver metastases on survival after hepatic surgery. The subject group study consisted of 77 patients who underwent liver surgery for metastases from colorectal cancer. The survival rate after hepatic surgery was analysed using multivariate Cox's proportional hazards model with the following variables: (1) size of dominant metastases (Small: < 3 cm; Medium: > or = 3 cm and < 6 cm; Large: > or = 6 cm); (2) synchronous versus metachronous resection; (3) solitary versus multiple metastases. The size of dominant metastases (p = 0.035) and synchronous versus metachronous resection (p = 0.0009) were independently associated with survival after liver resection. No association was found, however, for solitary versus multiple metastases. The survival of the Large group was much poorer than that of the Small group (p = 0.0168) and that of the Medium group (p = 0.0205), with statistically significant differences. No statistically significant difference was seen between the Small and the Medium groups (p = 0.7963). This study showed that long-term survival following resection of metastases was much poorer when metastases were 6 cm or greater in diameter. With regard to metastases less than 6 cm in diameter, resection of the smallest of these (less than 3 cm) did not appear to improve survival.
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