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Suzuki O, Koura M, Takano K, Noguchi Y, Uchio-Yamada K, Matsuda J. 148 PRODUCTION OF PUPS BY OVARIAN TRANSFER IN THE SYRIAN HAMSTER. Reprod Fertil Dev 2008. [DOI: 10.1071/rdv20n1ab148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Instead of gametes, ovaries could be used as alternative resources for cryopreservation. In this study, we attempted to produce pups by transplantation of fresh ovaries to foster mothers as a first step to establish a preservation method of hamster strains on the basis of the cryopreservation of ovaries in combination with ovarian transfers. We also checked the possibility of inter-strain transfers of ovaries, since immunological tolerance among hamster strains is suggested by the fact that most Syrian hamsters were derived from only a small number of animals. Fresh ovaries collected from 3-weekold females of HAW (white coat) and APA (albino) strains were transferred into ovarian bursae of 3-week-old recipient females with agouti-coat (Slc:Syrian) under anesthesia with xylazine and ketamine. Halves of ovaries of recipients were removed immediately before the transfers, i.e., both donor and recipient ovaries were present in each ovarian bursa. Successful transplantation of ovaries was checked by the coat color (non-agouti color) of offspring produced by test matings of recipients with Slc:Syrian males after the recipients became mature. Five and six recipients received HAW and APA ovaries, respectively. All 11 recipients tested became pregnant and delivered pups. According to the coat color of the pups, three of five recipients which received HAW ovaries and one of six recipients which received APA ovaries delivered pups derived from transplanted ovaries (two out of eight pups, one out of seven pups, and three out of 11 pups for HAW; one out of five pups for APA). Our results indicate that transplantation of fresh ovaries to foster mothers could be used for production of pups from grafted ovaries in the Syrian hamster. In particular, immunological tolerance for ovarian transfers among at least three strains suggests that recipient strains might not need to be the same as donor strains for practical ovarian transfers in the Syrian hamster. Our results would facilitate the development of a strain preservation system for the Syrian hamster based on ovarian cryopreservation.
This work was supported by a grant from the Ministry of Health, Labor, and Welfare of Japan.
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Abstract
OBJECTIVE Hydroxiapatite (HA) has been suggested as a useful biomaterial to support the regeneration of tissues. In this study, we investigated the adhesion of periodontal ligament (PDL) cells on octacalcium phosphate (OCP) and its hydrolyzed apatitic product (HL), which are known precursors of HA. METHODS Rat PDL cells were cultured on OCP or HL-coated dishes. Cell proliferation and adhesion and mRNA expression of collagen I, fibronectin integrin subunits were examined. Cell adhesion inhibition assays were carried out by GRGDSPK (Gly-Arg-Gly-Asp-Ser-Pro-Lys). RESULTS In early culture period, the cell number of PDL cells was lower on OCP and HL than that on control without any coating. However, the cell number on OCP or HL caught up with control later period. mRNA expression level of collagen I and fibronectin on OCP and HL were similar among OCP HL and control, although they differed early in the culture period. Integrin subunits were expressed on both OCP and HL as well as on control. Cell adhesion was inhibited by RGD inhibitor peptide. CONCLUSION Our findings indicated that rat PDL cells produce collagen I and fibronectin on OCP and HL, and then show increased cell numbers depending on adhesion to the matrices through integrins.
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Affiliation(s)
- J Hatakeyama
- Division of Craniofacial Development and Regeneration, Tohoku University Graduate School of Dentistry, Sendai, Japan.
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Nakamura S, Tanaka E, Shimamoto S, Suzuki O, Morimoto M, Nishiyama K. Concurrent Chemoradiotherapy With Full-Dose Gemcitabine for Unresectable Pancreatic Cancer. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.1295] [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: 10/22/2022]
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Honda Y, Kamakura S, Sasaki K, Suzuki O. Formation of bone-like apatite enhanced by hydrolysis of octacalcium phosphate crystals deposited in collagen matrix. J Biomed Mater Res B Appl Biomater 2007; 80:281-9. [PMID: 16850470 DOI: 10.1002/jbm.b.30595] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [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: 11/09/2022]
Abstract
It has been shown that granules of synthetic octacalcium phosphate (OCP) or the composites with collagen are capable of enhancing bone regeneration, accompanied by a gradual conversion from OCP to apatite with time. The present study was designed to investigate whether formation of bone-like apatite can be accelerated by OCP deposited throughout collagen matrix (OCP collagen complex, OCC) immersed in simulated body fluid (SBF). The formation of bone-like apatite has been suggested to be essential to induce osteoconductivity of various substrates. The formation of OCP in collagen solution was investigated in calcium or phosphate ions in the range between 22.5 and 142.5 mM and pH 6.26 and 8.56. X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy (SEM) showed that condition to nucleate OCP was limited to that of a solution with Ca/P 0.43 around pH 7.16 in the presence of collagen. OCP was shown to be formed throughout the collagen matrix by SEM observation. The immersion of OCC in SBF up to 10 days enhanced apatite crystal deposition, probably through OCP-apatite conversion: the apatite formation in OCC took place within only 1 day. The present study indicated that the existence of OCP deposited throughout the collagen matrix promotes bone-like apatite formation under physiological condition.
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Affiliation(s)
- Y Honda
- Division of Craniofacial Function Engineering (CFE), Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan
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Maejima K, Suzuki O, Uchida T, Aoki N, Tachibana M, Ishibashi K, Ochiai Y. Raman and Transport Studies in Multi-Walled Carbon Nanotubes. ACTA ACUST UNITED AC 2006. [DOI: 10.1088/1742-6596/38/1/009] [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: 11/11/2022]
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Akiba N, Sasano Y, Suzuki O, Sasaki K. Characterization of dentin formed in transplanted rat molars by electron probe microanalysis. Calcif Tissue Int 2006; 78:143-51. [PMID: 16525750 DOI: 10.1007/s00223-005-0134-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [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] [Received: 06/02/2005] [Accepted: 11/21/2005] [Indexed: 10/24/2022]
Abstract
The present study was designed to characterize dentin formed in transplanted rat molars by investigating calcium (Ca), phosphorus (P), and magnesium (Mg) concentrations using electron probe microanalysis (EPMA) as well as examining the rate of dentin matrix formation by vital staining. The unerupted immature lower right second molar in 2-week-old rats was transplanted into the upper right first molar socket. Rats were injected with oxytetracycline, calcein, and alizarin intraperitoneally at 1 day before and 1 and 2 weeks after transplantation, respectively, for vital staining. The maxillae and mandibles were fixed 3 weeks after transplantation, resected, and embedded in resin. Undemineralized sections were cut and examined by fluorescent microscopy and EPMA. The thickness of dentin formed in the first week after transplantation was significantly less than that of dentin formed in any other 1-week period in the transplanted tooth and was about one-fifth the thickness of dentin formed in control teeth. Formation of dentin recovered in the third week after transplantation. In the first week after transplantation, EPMA demonstrated a sharp increase in Mg concentration with a slight decrease in Ca concentration. Thereafter, no significant difference was identified among Ca, P, or Mg concentrations or the Ca/P ratio between transplanted and control teeth. These results suggest that disruption of the circulation and innervation by transplantation cause a temporary change in the matrix formation rate and elemental distribution of dentin, which is subsequently restored within 2 weeks after transplantation.
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Affiliation(s)
- N Akiba
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
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Imaizumi H, Sakurai M, Kashimoto O, Kikawa T, Suzuki O. Comparative study on osteoconductivity by synthetic octacalcium phosphate and sintered hydroxyapatite in rabbit bone marrow. Calcif Tissue Int 2006; 78:45-54. [PMID: 16397737 DOI: 10.1007/s00223-005-0170-0] [Citation(s) in RCA: 137] [Impact Index Per Article: 7.6] [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] [Received: 09/30/2005] [Accepted: 09/30/2005] [Indexed: 11/29/2022]
Abstract
Octacalcium phosphate (OCP) is thought to be a precursor of the mineral crystals in biological apatite. Synthetic OCP has been shown to be converted into an apatite structure when implanted in murine calvarial bone, to enhance bone regeneration more than synthetic hydroxyapatite (HA), and to degrade faster than biodegradable beta-tricalcium phosphate. This study was designed to investigate whether OCP implantation enhances the formation and resorption of new bone (remodeling) concomitant with OCP degradation when implanted intramedullary in a rabbit femur for 12 weeks, compared to sintered HA ceramic. Histological and histomorphometric analyses using undecalcified specimens showed that the area of bone apposition was significantly higher on OCP than on HA between 2 and 3 weeks, whereas it subsequently became smaller on OCP than on HA. The area attacked by multinucleated giant cells, including tartrate-resistant acid phosphatase (TRAP)-positive cells, was significantly higher for OCP than for HA at 8 weeks. Radiography revealed resorption of OCP but not of HA. The results disclose some osteoconductive characteristics of synthetic OCP in the bone marrow space: (1) enhancement of bone regeneration at the initial bone apposition stage and (2) stimulation of resorption of the newly formed bone coupled with OCP biodegradation mediated by TRAP-positive osteoclast-like cells. These results suggest that synthetic OCP would be a more useful bone substitute than HA in implant applications where rapid bone formation and concomitant implant resorption are important considerations.
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Affiliation(s)
- H Imaizumi
- Department of Orthopedic Surgery, Furukawa City Hospital, Furukawa, Japan
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Aoki M, Kimura K, Suzuki O. Predicting time of parturition from changing vaginal temperature measured by data-logging apparatus in beef cows with twin fetuses. Anim Reprod Sci 2005; 86:1-12. [PMID: 15721655 DOI: 10.1016/j.anireprosci.2004.04.046] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2003] [Revised: 01/22/2004] [Accepted: 04/15/2004] [Indexed: 11/25/2022]
Abstract
Vaginal temperatures (VT) of crossbred (Japanese Black crossed Holstein-Friesian) beef cows (n = 31) were measured by a data-logging apparatus to obtain serial data from days 0 to 6 before parturition. For both single and twin pregnancies, no significant differences were observed in VT during days 3-6 before parturition. Maternal VT was not affected by maternal weight just after parturition, parity, fetal sex, or total fetal litter weight. Average of twin litter weights for two males (MM) and two females (FF) had the strong positive correlations (r = 0.84; P < 0.05) with maternal VT, whereas twin weights of mixed-gender twins (FM) did not correlate with maternal VT (r = -0.26; P = 0.61). Maternal temperature decreased as weights of the female fetus of FM twins became heavier (r = -0.82; P < 0.05). In contrast, maternal VT of FF and MM twins increased as twin weights increased. We defined when the VT began to decrease before parturition by two different methods. One was the "same hours method" where differences in VT between a particular time of day and the corresponding time of the preceding day were compared when the VT was consistently > or =0.3 or > or =0.5 degrees C for more than 3h. The second method was the "maximum-minimum method" where decreased in the maximum or the minimum values of the day over > or =0.3 and > or =0.5 degrees C were compared to values of preceding day. Onset of decreased VT before expulsion was not different between singletons and twins. In an attempt to define the critical condition in predicting parturition, we estimated assumable predicting probability using the 31 cows that were collected VT. When the parturition occurred within 60 h in the "same hours method" and 72 h since VT was > or =0.3 degrees C and in the "maximum-minimum method", the assumable probability was 100%. In verification experiment under these condition, the "same hours method" had a higher probability of predicting the time of parturition than the "maximum-minimum method", and it was possible to detect the onset of decreased VT at the correct time by the minutes. We concluded that "same hours method" was useful for predicting parturition time in cattle with single and twin pregnancies by the serial measurement of vaginal temperature.
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Affiliation(s)
- M Aoki
- Department of Animal Breeding and Reproduction, National Institute of Livestock and Grassland Science, National Agricultural Research Organization, 768 Senbonmatsu, Nishinasuno, Tochigi 329-2793, Japan.
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Arnold JW, Boothe DH, Suzuki O, Bailey GW. Multiple imaging techniques demonstrate the manipulation of surfaces to reduce bacterial contamination and corrosion. J Microsc 2004; 216:215-21. [PMID: 15566492 DOI: 10.1111/j.0022-2720.2004.01415.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [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: 11/28/2022]
Abstract
Surface imaging techniques were combined to determine appropriate manipulation of technologically important surfaces for commercial applications. The complementarity of the microscopy methods, scanning electron microscopy, electron probe microanalysis and atomic force microscopy assessed and correlated form and function of the surface modifications. Stainless steel disks (1 cm in diameter) were laser-cut from the same sheets of stainless steel and treated by electropolishing or left untreated for controls. Each treatment was analysed separately using each technique. First, the disks were examined by visual inspection and electron probe microanalysis for surface characteristics and elemental composition, respectively. Aliquots of bacterial suspensions (saline rinses of poultry carcasses from a commercial broiler processing plant) were then diluted in broth and monitored for growth by spectrophotometry. Stainless steel disks (1 cm in diameter) were added and the cultures were grown to sufficient density to allow attachment of bacterial cells to test surfaces. Relative differences in the surface morphology shown by atomic force microscopy, including Z ranges, roughness and other measurements, corresponded by treatment with the differences in reduction of bacterial counts shown by scanning electron microscopy. A model of wet-processing conditions tested the effects of corrosive treatment of surfaces. Less bacterial attachment occurred after corrosive treatment on controls and electropolished samples. Electropolishing significantly reduced bacterial numbers and the effects of corrosive action compared to the controls. Thus, the multiple imaging techniques showed that engineered changes on stainless steel surfaces improved the resistance of the surface finish to bacterial attachment, biofilm formation, and corrosive action.
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Affiliation(s)
- J W Arnold
- USDA-ARS, Russell Research Center, Athens, Georgia, USA
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Sahara Y, Miyachi S, Nagasaka T, Negoro M, Suzuki O, Hattori K, Kobayashi N, Kojima T, Yoshida J. Radiological and pathological changes in the sinus of an experimental arteriovenous fistula of the rat. Interv Neuroradiol 2004; 9:101-5. [PMID: 20591237 DOI: 10.1177/15910199030090s113] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2003] [Accepted: 02/06/2003] [Indexed: 11/15/2022] Open
Abstract
SUMMARY The object of this study is to evaluate the radiological and pathological changes in the sinus of an experimental arteriovenous fistula of the rat. Twenty-five male Sprague-Dawley rats, including two control rats, were used for this study. A venous hypertension model in the transverse sinus was induced by means of anastomosis of a common carotid artery (CCA) to the ipsilateral external jugular vein (EJV). Rats were sacrificed 11 to 42 weeks after the procedure, then histopathological and immunohistopathological examinations were performed for the resected transverse sinus. Follow-up angiography was performed two to three weeks after the anastomosis in every case, and five months later in two rats. Patency of the anastomosed portion was confirmed in 12 of the 23 anastomosed rats. An ipsilateral carotid angiogram demonstrated a highflow arteriovenous (AV) shunt from the CCA to the sigmoid-to-transverse sinus and draining into the contralateral juglar vein. A contralateral angiogram displayed a steal phenomenon via the communicating artery. Histopathologically, the vein of the anastomosed portion and the transverse sinus were markedly dilated in with cases. There was a thickening the connecting tissue and a proliferation of fibroblast in four (50%) of the eight cases. Thrombus formation in the transverse sinus was found in one case. VEGF stained strongly in the endothelial hypertrophied area and in fibrous connective tissue around the transverse sinus compared to the control sinuses. Our results from this long-term observation of the radiological and pathological changes in the sinus exposed to hypertension resembled the clinical findings of a dural AV fistula.
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Affiliation(s)
- Y Sahara
- Department of Neurosurgery, Chubu-Rosai Hospital; Japan
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Suzuki O, Miyachi S, Negoro M, Okamoto T, Sahara Y, Hattori K, Kobayashi N, Kojima T, Yoshida J. Treatment strategy for aneurysms of the posterior cerebral artery. Interv Neuroradiol 2004; 9:83-8. [PMID: 20591234 DOI: 10.1177/15910199030090s110] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2003] [Accepted: 02/06/2003] [Indexed: 11/17/2022] Open
Abstract
SUMMARY The authors carried out a retrospective review of the records of 12 patients with aneurysms of the posterior cerebral artery (PCA). Four were asymptomatic, 1 presented with a mass effect, and 7 with a subarachnoid haemorrhage (SAH). Of the 7 ruptured aneurysms, 3 were embolized and 2 were clipped. However, 2 patients died from rebleeding before any treatment. Of the 5 unruptured aneurysms, 1 was embolized with coils but the remaining 4 have been conservatively observed. No aneurysms have ruptured during the follow-up period, and 3 have thrombosed spontaneously. According to our results, the PCA aneurysms should be treated aggressively in the early phase. Although the preservation of the anatomical integrity of the PCA should naturally be one of the prime objectives, PCA occlusion may sometimes be inevitable when treating large or fusiform aneurysms. On the other hand, conservative therapy is one of the options for the treatment of incidentally encountered unruptured ones, because these have the possibility of spontaneous thrombosis.
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Affiliation(s)
- O Suzuki
- Department of Neurosurgery, Nagoya Ekisaikai Hospital, Nagoya; Japan -
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Kobori RF, Suzuki O, Wierzbicki R, Della Vecchia PT, Camargo LEA. Occurrence of Podosphaera xanthii Race 2 on Cucumis melo in Brazil. Plant Dis 2004; 88:1161. [PMID: 30795263 DOI: 10.1094/pdis.2004.88.10.1161a] [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] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Powdery mildew is an important disease of melons (Cucumis melo L.) cultivated in greenhouses in Brazil. Currently, there are 5 races of Podosphaera xanthii (formerly known as Sphaerotheca fuliginea) and 2 races of Golovinomyces cichoracearum (formerly known as Erysiphe cichoracearum) described on melons worldwide, but only race 1 of P. xanthii has been reported in Brazil (1). However, typical whitish powdery fungal growth was observed on an experimental hybrid yellow melon resistant to race 1 of P. xanthii during the summer of 2000 in a greenhouse in Bragança Paulista, State of São Paulo. Conidia collected from diseased leaves were spread onto 0.5% water agar medium and maintained at 22°C for 24 h with 12 h of light and 12 h of darkness. Most of the germinated conidia displayed fibrosin inclusion bodies when observed in a solution of 3% potassium hydroxide (KOH), and approximately 1 of 50 also displayed forked germ tubes. These features allowed us to identify P. xanthii as the causal agent. Conidia raised on the susceptible yellow melon 'Amarelo CAC' were used to inoculate cotyledons of the differential melon lines (2) 'Hale's Best Jumbo' (susceptible to races 1, 2, and 3 of P. xanthii), 'PMR-45' (resistant to race 1 and susceptible to races 2 and 3), and 'PMR-6' (resistant to races 1 and 2 and susceptible to race 3). Inoculations were performed on 10 plants of each differential line and replicated four times. The presence or absence of symptoms was evaluated 18 days after inoculation. 'Hale's Best Jumbo' and 'PMR-45' were rated as susceptible while 'PMR-6' was rated as resistant, thus indicating the presence of race 2 of P. xanthii in Brazil. During field surveys from 2001 to 2003, this race was found on squash (Cucurbita moschata), summer squash (C. pepo), and melons in São Paulo. References: (1) F. J. B. Reifschneider et al. Plant Dis. 69:1069, 1985. (2) C. E. Thomas et al. Cucurbit Genet. Coop. 7:126, 1984.
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Affiliation(s)
- R F Kobori
- Sakata Seed Sudamerica Ltda., C. P. 427, CEP - 12906-840, Bragança Paulista, SP, Brazil
| | - O Suzuki
- Sakata Seed Sudamerica Ltda., C. P. 427, CEP - 12906-840, Bragança Paulista, SP, Brazil
| | - R Wierzbicki
- Sakata Seed Sudamerica Ltda., C. P. 427, CEP - 12906-840, Bragança Paulista, SP, Brazil
| | - P T Della Vecchia
- Sakata Seed Sudamerica Ltda., C. P. 427, CEP - 12906-840, Bragança Paulista, SP, Brazil
| | - L E A Camargo
- Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, 13418-900, Piracicaba, SP, Brazil
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Suzuki O, Miyachi S, Okamoto T, Ito A, Shinkai M, Honda H, Kobayashi T, Negoro M, Yoshida J. Local hyperthermia enhances thrombosis in aneurysms containing platinum coils. Interv Neuroradiol 2004; 10:203-11. [PMID: 20587232 PMCID: PMC3463249 DOI: 10.1177/159101990401000302] [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] [Received: 07/08/2004] [Accepted: 07/18/2004] [Indexed: 03/19/2024] Open
Abstract
SUMMARY Despite recent technical advances in embolization of cerebral aneurysms with platinum coils, some aneurysms eventually resulted in incomplete packing with remnant neck or dome filling. Such a situation with a remaining inflow zone may pose a risk of rupture and subsequent regrowth. Metals characteristically generate heat under high-frequency alternating magnetic fields (AMF). We used this property to induce local hyperthermia and promote thrombogenesis in incompletely packed aneurysms. Glass model aneurysms packed with coils were subjected to AMF to investigate the correlation between weight of platinum and temperature elevation and the correlation between flow rates of water through the model and temperature elevation. Next, activated coagulation time (ACT) of blood obtained from dogs was studied at various temperatures. Finally, side-wall aneurysms created in the canine carotid artery using a venous patch were packed with platinum coils. Change in temperature and angiographic changes were investigated after AMF application. In the glass model, the weight of platinum was correlated with elevation of temperature, and a negative logarithmic correlation was evident between flow rate and elevation of temperature. Elevation of blood sample temperature tended to shorten ACT. In canine carotid aneurysms, elevation of intra-aneurysmal temperature was confirmed and sufficient elevation of temperature was found to promote angiographically evident thrombogenesis of the remnant space after AMF application. Local hyperthermia may be useful in completing luminal obliteration of aneurysms after coil embolization. It may particularly useful for ruptured aneurysms to prevent the early rerupture.
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Affiliation(s)
- O Suzuki
- Department of Neurosurgery, Nagoya University Graduate School of Medicine; Nagoya, Japan -
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Fukui K, Suzuki O, Ito S, Miyazaki M, Hattori K, Osawa H. Comparison of Endovascular and Surgical Treatment for Ruptured Cerebral Aneurysms with respect to Short and Long-Term Outcome. Interv Neuroradiol 2004; 10:129-34. [PMID: 20587224 DOI: 10.1177/159101990401000204] [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] [Received: 03/14/2004] [Accepted: 03/21/2004] [Indexed: 12/13/2022] Open
Abstract
SUMMARY We compared the treatment for ruptured aneurysms from the clinical and radiological follow-ups after endovascular (GDC) or surgical treatment. There were 142 surgically treated cases and 38 endovascular treated cases from May 1997 to December 2001. In endovascular cases there were four A-com, four MCA, 12 ICA and 18 posterior circulation aneurysms. In surgical cases, there were 53 A-com ACA, 51 MCA, 36 ICA and two posterior circulation aneurysms. The clinical outcomes of endovascular and surgical treatments were correlated with the H & H grades before treatments. At short stage, 71% of endovascular and 78.2% of surgical cases showed a favorable outcome (GOS GR or MD) (p=0.3). Long-term clinical follow ups (14.5 to 58 months) showed 77.7% of endovascular and 87.7% of surgical cases resulted in GR or MD (p=0.17). In endovascular cases, 22.2% showed recurrence during the follow-up period and five of them needed re-treatment. We experienced failed endovascular approach at acute stage in seven cases which changed to surgery. In conclusion, the short and long term clinical results of endovascular treatment were acceptable comparing surgical clipping. High recurrence rate after GDC treatment did not permit future completeness of the treatment. Still the treatment alternative between endovascular or surgical treatment may change depending on the criteria of each institution, attention should be paid to the disadvantages of endovascular treatment as the first choice for ruptured aneurysms.
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Affiliation(s)
- K Fukui
- Department of Neurosurgery, Nagoya Ekisaikai Hospoital, Nagoya, Japan
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Miyachi S, Okamoto T, Kobayashi N, Kojima T, Hattori KI, Nakai K, Suzuki O, Sahara Y, Hattori K, Yoshida J. Nagoya university training system for neuroendovascular therapists. Interv Neuroradiol 2004; 10 Suppl 1:103-6. [PMID: 20587283 DOI: 10.1177/15910199040100s117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2004] [Accepted: 01/20/2004] [Indexed: 11/16/2022] Open
Abstract
SUMMARY It is very important to train more neuroendovascular therapists (NETists) in response to Japan's growing social needs. Since the supply of qualified NETists is still insufficient to cover Japanese institutions, therefore some emergency cases with indications for endovascular therapy may be overlooked, untreated or treated by other methods resulting in unfavorable outcomes. Thus, neuroendovascular therapies are situated as one of the important tratment modalities for neurosurgical diseases (1,2). We studied our present states of the endovascular neurosurgery and introduce our training system.
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Affiliation(s)
- S Miyachi
- Division of Endovascular Neurosurgery, Department of Neurosurgery, Nagoya University Graduate School of Medicine, Nagoya; Japan -
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Suzuki O, Hata T, Koura M, Noguchi Y, Takano K, Yamamoto Y, Matsuda J. 251SEARCH FOR GENES INVOLVED IN DEVELOPMENTAL COMPETENCE IN
MOUSE OOCYTES USING SUPPRESSION SUBTRACTIVE HYBRIDIZATION. Reprod Fertil Dev 2004. [DOI: 10.1071/rdv16n1ab251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
During the first month after birth, synchronous follicular growth occurs in the ovary of immature mice (first wave). Previously, we showed that mouse oocytes during the first wave were more competent developmentally in older females (Suzuki O et al., 2002 Theriogenology 57, 628 abst), although the numbers of mature oocytes did not differ with female age (17, 18, and 24 days old). In this study, we examined the genetic factors that affect the developmental competence of mouse oocytes during the first wave using suppression subtractive hybridization (SSH). Oocytes collected from 17- and 24-day-old B6D2F1 females (D17 and D24, respectively) without hormonal treatment were matured in Waymouth medium supplemented with pyruvate (0.23mM), antibiotics, bovine fetuin (1mgmL−1), and polyvinylpyrrolidone (3mgmL−1). After 17-h culture at 37°C in an atmosphere of 5% CO2, 5% O2, and 90% N2, total RNA was isolated from oocytes whose germinal vesicles had broken down (mature oocytes), separately, in three independent culture groups per age (each group contained oocytes from four animals) using Cell-to-cDNA Cell Lysis Buffer (Ambion, Austin, TX, USA). Some of the total RNA from each independent group was pooled by age (total of RNA from approximately 100 oocytes per age) and used for SSH. A SMART cDNA Synthesis Kit (Clontech, Palo Alto, CA, USA) was used to reverse-transcribe total RNA to cDNA. SSH was performed with a PCR-Select cDNA Subtraction Kit (Clontech). The subtracted PCR products were cloned into pGEM-T vector (Promega, Madison, WI, USA). Clones from the subtracted library (D24−D17) were sequenced and their identities were examined using the NCBI BLAST search. The differential expression of candidate genes preferentially expressed in mature D24 oocytes suggested by SSH was confirmed with cDNA transcribed separately in the three independent culture groups per age using real-time quantitative PCR with an ABI Prism 7900HT with TaqMan technology (Applied Biosystems, Foster City, CA, USA). Of 513 clones sequenced, the top six preferentially-expressed candidate genes in more developmentally-competent D24 oocytes were spindlin (20 clones), bmi-1 (4 clones), cyclin B1 (4 clones), E330034G19Rik (4 clones), Jagged1 (4 clones), and Ndfip2 (4 clones). The expression of spindlin in mature D24 oocytes (relative threshold cycle: −3.8±0.7, mean±SD) was confirmed to be approximately 11-fold higher than in D17 oocytes (−0.3±1.5) when GAPDH was used as an internal control (P<0.05, t-test). Quantitative analyses of mRNA expression of the remaining genes are now under way. Our results suggest that spindlin is one of the key factors leading to the acquisition of developmental competence in mouse oocytes during folliculogenesis. Supported by JSPS KAKENHI (No.145716000) and MHLW.
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69
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Abstract
A bioactive and resorbable scaffold is necessary to exhibit the osteoinductive potency of recombinant human bone morphogenetic protein-2 (rhBMP-2). In a previous study, we found that synthetic octacalcium phosphate (OCP) enhances bone regeneration and is replaced by newly formed bone after it is resorbed. We hypothesized that OCP may be useful as an effective scaffold for rhBMP-2 to enhance bone regeneration. To test this hypothesis, the present study was designed to investigate whether an OCP/BMP composite implant could more effectively enhance bone regeneration. A critical-sized defect was made in a rat calvarium and 1. 15 mg of OCP combined with 10 microg of rhBMP-2 (OCP/BMP 10 microg), 2. 15 mg of OCP combined with 1 microg of rhBMP-2 (OCP/BMP 1 microg), or 3. OCP (OCP alone) was implanted into the defect and fixed at 4 or 8 weeks after implantation. The percentage of newly formed bone (n-Bone%) in the defect was determined by a histomorphometrical analysis. A statistical analysis showed that n-Bone% with OCP/BMP was significantly higher than that with OCP at both time points, whereas the difference in n-Bone% between OCP/BMP 10 microg and OCP/BMP 1 microg was not significant. The present results suggest that OCP can be used as an effective scaffold for rhBMP-2 and this OCP delivery system may be able to reduce the standard effective dose of rhBMP-2, which would be beneficial because low doses (<100 microg/g OCP) of rhBMP-2 enhance bone regeneration.
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Affiliation(s)
- S Kamakura
- Division of Clinical Cell Therapy, Department of Translational Research, Center for Translational and Advanced Animal Research, Tohoku University School of Medicine, 2-1 Seiryo-Machi, Aoba-Ku, Sendai 980-8574, Japan.
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70
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Michinaka Y, Aki T, Shimauchi T, Nakajima T, Kawamoto S, Shigeta S, Suzuki O, Ono K. Differential response to low temperature of two Delta6 fatty acid desaturases from Mucor circinelloides. Appl Microbiol Biotechnol 2003; 62:362-8. [PMID: 12728343 DOI: 10.1007/s00253-003-1326-3] [Citation(s) in RCA: 29] [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] [Received: 09/09/2002] [Revised: 02/21/2003] [Accepted: 03/16/2003] [Indexed: 11/27/2022]
Abstract
A recently identified Delta6 fatty acid desaturase in Mucor rouxii shows a low sequence homology (approximately 24% at the amino acid level) to that isolated from Mortierella alpina, but is phylogenetically closer to a plant enzyme, suggesting the occurrence of Delta6 desaturase isozymes in Mucorales molds. In the present study, two types of Delta6 desaturases, mcD6-1 ( Mo. alpina type) and mcD6-2 ( M. rouxii type), were cloned from Mucor circinelloides. When the cloned genes were expressed in the yeast Saccharomyces cerevisiae in the presence of a linoleic acid substrate (C18:2Delta9, 12), a newly generated gamma-linolenic acid (C18:3Delta6, 9, 12) was detected in the cells, which confirmed the suspected enzymatic function of the recombinant protein. This is the first report of Delta6 desaturase isozymes present in one organism. Northern analysis demonstrated that the amount of mcD6-2 mRNA was less than half of that of mcD6-1 mRNA in cells grown at 28 degrees C. However, upon cultivation of the cells at 15 degrees C for 0.5-1 h, mcD6-2 mRNA rapidly increased by up to 1.5-fold and then gradually decreased. By contrast, mcD6-1 transcripts levels did not fluctuate significantly for 1 h after the temperature shift, but declined by 75% over the next 2 h. The gamma-linolenic acid content in total fatty acid from M. circinelloides decreased at 28 degrees C, but was maintained at approximately 30% at 15 degrees C. These data suggest that Delta6 desaturase isozymes play physiologically distinct roles in the maintenance of cellular lipids and adaptation to low temperature.
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Affiliation(s)
- Y Michinaka
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, 739-8530 Higashi-Hiroshima, Japan
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71
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Kojima T, Miyachi S, Negoro M, Nakabayashi K, Fukui K, Takahashi I, Sahara Y, Suzuki O, Hattori K, Kobayashi N, Hattori K, Nakai K, Yoshida J. Coil retrieval following embolization of cerebral aneurysms. Interv Neuroradiol 2003; 9:149-55. [PMID: 20591245 DOI: 10.1177/15910199030090s121] [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] [Subscribe] [Scholar Register] [Received: 01/30/2003] [Accepted: 02/06/2003] [Indexed: 11/15/2022] Open
Abstract
SUMMARY Failed coil embolization of cerebral aneurysms may be occasionally followed by direct surgical treatment. We had 5 patients who underwent coil retrieval and surgical clipping after coil embolization because of periprocedural complications. The patients, ranging in age from 40 to 71, had wide-neck aneurysms located at the anterior communicating artery (AcomA) in 3 patients, the middle cerebral artery (MCA) in 1, and the internal carotidophthalmic artery (IC-Ophthalmic) in 1. They were embolized with Guglielmi detachable coils (GDCs), which had to be retrieved within 8 days because of coil protrusion and migration in 3 patients, aneurysm rupture in 1, and increased mass effect due to coil compaction in 1. Coils were successfully removed with aneurysmotomy or arteriotomy under temporary trapping, aneurysms were then clipped or trapped. Three patients had a good outcome, but one suffered permanent visual disturbance and the other had a motor deficit. Our study revealed that a small AcomA aneurysm had a high risk of complication in a case of complex anatomy of the AcomA-A1-A2 complex with its difficult access. In addition, insufficient packing of the inflow zone in a large and symptomatic aneurysm may cause coil compaction and regrow with increasing mass effect. The indication and treatment strategy for these aneurysms should be carefully determined.
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Affiliation(s)
- T Kojima
- Department of Neurosurgery, Nagoya University School of Medicine, Nagoya; Japan
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72
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Miyachi S, Negoro M, Sahara Y, Suzuki O, Hattori K, Kobayashi N, Kojima T, Handa T, Nakabayashi K, Takahashi I, Fukui K, Iwakoshi T, Hattori T, Okamoto T, Yoshida J. Treatment Strategy for Cerebral Aneurysms Based on the Evidence of the Efficacy of GDC Embolization. Interv Neuroradiol 2003; 9:51-5. [PMID: 20591230 DOI: 10.1177/15910199030090s106] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2003] [Accepted: 02/06/2003] [Indexed: 11/16/2022] Open
Abstract
SUMMARY The authors reviewed 531 patients with cerebral aneurysms treated with Guglielmi detachable coils (GDCs) over 5 years to clarify both the advantages and disadvantages of embolization based on the evidence of complications by aneurysm profile. There were 52 technical complications, 25 of which resulted in unfavorable patient outcomes. Intraoperative rupture, the most serious complication exacerbating the patient's condition, occurred in 19 patients, 4 of whom expired. All of these aneurysms were very small and were mostly located in the AcomA and PICA portions. Thirteen patients encountered thromboembolic complications, 6 of whom were elderly with acute ruptured aneurysms at MCA and the tip of BA. For large or giant aneurysms manifesting the mass effect, particularly those in the ICA-C2 portion compressing the optic nerve, the saccular packing did little to ameliorate the symptoms, and subsequent surgical or endovascular trapping was needed. Therefore, saccular embolization of endovascularly difficult, very small AcomA aneurysms and large C2 aneurysm with visual symptoms should be used sparingly based on a risk-benefit assessment.
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Affiliation(s)
- S Miyachi
- Division of Endovascular Neurosurgery, Department of Neursosurgery, Study Group of Endovascualr Neurosurgery, Nagoya University Graduate School of Medicine; JShowa-ku, Nagoya; Japan -
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73
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Arinobu T, Hattori H, Ishii A, Kumazawa T, Lee XP, Suzuki O, Seno H. Comparison of sonic spray lonization with atmospheric pressure chemical lonization as an interface of liquid chromatography-mass spectrometry for the analysis of some local anesthetics. Chromatographia 2003. [DOI: 10.1007/bf02492400] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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74
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Minakata K, Nozawa H, Suzuki KW, Suzuki O. Paternity diagnosis by using umbilical cords preserved for periods ranging from 9 months to 44 years. Int J Legal Med 2002; 116:314-5. [PMID: 12376847 DOI: 10.1007/s00414-002-0324-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2001] [Accepted: 06/06/2002] [Indexed: 11/24/2022]
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75
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Watanabe-Suzuki K, Suzuki O, Kosugi I, Seno H, Ishii A. A curious autopsy case of a car crash in which self-strangulation and lung collapse were found: a case report. Med Sci Law 2002; 42:261-264. [PMID: 12201073 DOI: 10.1177/002580240204200312] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A curious autopsy case following the car crash of a 20-year-old male, in which self-strangulation and lung collapse were observed, is presented. His motor vehicle had crashed into a restaurant as a result of self-strangulation using an electrical cord wound four times around his neck. At autopsy, we found small rupture holes of spontaneous bullae in both lung apices, which had probably taken place upon collision during driving, petechial hemorrhages in the face skin and the absence of severe injuries. Since it seemed unlikely that the small holes in both lung apices caused fatal pneumothorax instantly, the cause of his death was judged to be asphyxia due to self-strangulation. It is not clear whether the self-strangulation was suicidal or autoerotic, because neither traces of suicidal intent nor circumstances suggesting either of them were disclosed.
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Affiliation(s)
- K Watanabe-Suzuki
- Department of Legal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu 431-3192, Japan
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76
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Kawamoto S, Fujimura T, Nishida M, Tanaka T, Aki T, Masubuchi M, Hayashi T, Suzuki O, Shigeta S, Ono K. Molecular cloning and characterization of a new Japanese cedar pollen allergen homologous to plant isoflavone reductase family. Clin Exp Allergy 2002; 32:1064-70. [PMID: 12100055 DOI: 10.1046/j.1365-2222.2002.01405.x] [Citation(s) in RCA: 23] [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] [Indexed: 11/20/2022]
Abstract
BACKGROUND Japanese cedar (Cryptomeria japonica) pollen is a major cause of seasonal pollinosis, and more than 10% of Japanese people suffer from this allergic disorder. However, only two major pollen allergens, Cry j 1 and Cry j 2, have been identified and exclusively characterized. OBJECTIVE The aim of this study was to explore and identify important Japanese cedar pollen allergens other than Cry j 1 or Cry j 2. METHODS C. japonica cDNA library was immunoscreened by rabbit antiserum raised against a partially purified cedar pollen allergen fraction. An isolated cDNA clone was inserted into a glutathione S-transferase (GST)-tagged Escherichia coli expression vector to obtain recombinant GST fusion protein. Non-fusion recombinant protein was purified by glutathione Sepharose affinity chromatography in conjunction with factor Xa cleavage of the GST moiety. IgE-binding ability of the recombinant protein was then evaluated by western blot analysis and enzyme-linked immunosorbent assay (ELISA). RESULTS The cDNA encodes 306 amino acids with significant sequence similarity to those of plant isoflavone reductase-like proteins, which include a recently identified birch pollen allergen Bet v 5. Western blot analysis demonstrated that recombinant protein was recognized by cedar pollinosis patient IgE. In contrast to Bet v 5 being reported as a minor allergen, the recombinant protein exhibited 76% IgE binding frequency (19/25) against pollinosis patients. CONCLUSION Here we identified the third member of Japanese cedar pollen allergen homologous to isoflavone reductase. Its high IgE-binding frequency implicates that the isoflavone reductase homologue might be an additional major pollen allergen in C. japonica.
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Affiliation(s)
- S Kawamoto
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Japan. skawa@ hiroshima-u.ac.jp
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77
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Watanabe-Suzuki K, Ishii A, Suzuki O. Cryogenic oven-trapping gas chromatography for analysis of volatile organic compounds in body fluids. Anal Bioanal Chem 2002; 373:75-80. [PMID: 12012175 DOI: 10.1007/s00216-002-1240-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [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: 11/07/2001] [Revised: 01/08/2002] [Accepted: 01/10/2002] [Indexed: 11/24/2022]
Abstract
Cryogenic oven-trapping (COT) with capillary GC has been successfully applied to analysis of chloroform, dichloromethane, trichloroethylene, diethyl ether, the components of solvent thinner (ethyl acetate, benzene, n-butanol, toluene, and others), xylene isomers, cyanide, ethanol, hexanes, general anesthetics, and styrene in human body fluids. This COT-GC technique was compared with headspace solid-phase microextraction (SPME) coupled with GC for some volatile organic compounds (VOC); for all compounds compared the sensitivity achieved using COT-GC was more than ten times higher than for headspace SPME-GC. The COT-GC method is recommended for widespread use in forensic and environmental toxicology, because it is simple, requires no special GC operations, and yet enables high sensitivity and high resolution.
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Affiliation(s)
- K Watanabe-Suzuki
- Department of Legal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu 431-3192, Japan.
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78
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Kamakura S, Sasano Y, Shimizu T, Hatori K, Suzuki O, Kagayama M, Motegi K. Implanted octacalcium phosphate is more resorbable than beta-tricalcium phosphate and hydroxyapatite. J Biomed Mater Res 2002; 59:29-34. [PMID: 11745534 DOI: 10.1002/jbm.1213] [Citation(s) in RCA: 145] [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] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Our previous studies have suggested that synthetic octacalcium phosphate (OCP) could be resorbed and replaced by newly formed bone if implanted in rat skull defects. We hypothesized that the implanted OCP is more resorbable than other commonly used bone graft substitutes of calcium phosphate compounds, such as hydroxyapatite (HA) and beta-tricalcium phosphate (beta-TCP). To test the hypothesis, the present study was designed to compare histomorphometrically resorption of the implanted OCP, HA, and beta-TCP, which were kept in the experimental cranial defect of rats for a long term. A full thickness of standardized trephine defect was made in the rat parietal bone, and the same volume of granules of OCP, HA, and beta-TCP were implanted into the defect. Five specimens of each group were fixed 6 months after implantation. The percentage of remaining implants (r-Imp%) and newly formed bone (n-Bone%) in the defect was analyzed histomorphometrically. The statistical analysis showed that the r-Imp% of OCP was significantly lower than that of HA and beta-TCP. In contrast, the n-Bone% of OCP was significantly higher than that of HA and beta-TCP. The present study has shown that the implanted OCP in the rat cranial defect is more resorbable than the implanted beta-TCP and HA, whereas the implanted OCP enhances bone formation more than the implanted beta-TCP and HA.
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Affiliation(s)
- S Kamakura
- Division of Stomatology and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan.
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79
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Okamoto T, Miyachi S, Negoro M, Suzuki O, Otsuka G, Sahara Y, Hattori K, Ryuke Y, Mizuno M, Yoshida J. Gene transfer for experimental saccular aneurysms. Interv Neuroradiol 2001; 7:131-5. [PMID: 20663390 DOI: 10.1177/15910199010070s119] [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: 09/12/2001] [Accepted: 09/15/2001] [Indexed: 11/16/2022] Open
Abstract
SUMMARY Reinforcing an aneurysmal wall is one possible way to prevent from aneurysm rupture. We preliminarily tried focal gene transfer against the wall of experimental aneurysms to aim the transgene remodeling of aneurysmal wall. Two experimental saccular aneurysms were created on canine common carotid artery with an artificial dissecting method, which resemble clinical aneurysms. Adenovirus vector (AxCALacZ, 10(8) pfu) was slowly injected into the aneurysm cavity for over 30 minutes under the condition of intraaneurysmal flow arrest using balloon-assisted neck-plasty technique. The arteries and aneurysms were evaluated 48 hours after the transduction with X-gal staining, and beta-galactosidase expression was detected mainly in the intima in both cases. No adverse effects on the normal carotid wall and no systemic complications were observed after the procedure. This experimental study suggests the possibility of gene therapy for cerebral aneurysms.
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Affiliation(s)
- T Okamoto
- Department of Neurosurgery, Toyohashi Municipal Hospital; Nagoya, Japan
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80
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Miyachi S, Negoro M, Okamoto T, Otsuka G, Suzuki O, Sahara Y, Yoshida J. Hemodynamic changes in drainage systems following treatment of cerebral arteriovenous malformations. Interv Neuroradiol 2001; 7:89-98. [PMID: 20663384 DOI: 10.1177/15910199010070s113] [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] [Subscribe] [Scholar Register] [Received: 09/12/2001] [Accepted: 09/15/2001] [Indexed: 11/16/2022] Open
Abstract
SUMMARY The authors studied 61 patients undergoing effective embolization for cerebral arteriovenous malformations (AVMs) and analyzed the hemodynamic changes in their drainage systems following embolization. The changes were classified into following 5 types: type A, disappearance of all the draining veins; type B, disappearance of a part of the cortical veins; type C, disappearance of a part of the deep-seated veins; type D, combined type Band C patterns; type E, disappearance of reflux into normal cortical veins. Each case was evaluated on the basis of these criteria from comparing pre- and post-embolization angiograms. The delay and reduction of shunt were observed in all cases. Forty-nine of them showed obvious hemodynamic changes in the draining systems including type A change in 9, type B in 19, C in 5, Din 3 and E in 13 cases, respectively. Two cases showed a spontaneous shift in the dominance of the main drainers. Thirteen of 15 cases showing successful results in subsequent radiosurgery exhibited various changes in draining pattern. Changes in drainage systems may be affected by the compartmentalization of the nidus, reduction in shunt flow, and spontaneous or progressive thromboses. These can be promoted by embolization and may be regarded as one of the indicators of successful pretreatment for radiosurgery.
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Affiliation(s)
- S Miyachi
- Department of Neurosurgery, Nagoya University Graduate School of Medicine, Nagoya; Japan -
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81
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Watanabe-Suzuki K, Nozawa H, Ishii A, Seno H, Suzuki O. A case of death due to rescue action by a power shovel after being buried alive. Leg Med (Tokyo) 2001; 3:241-5. [PMID: 12935702 DOI: 10.1016/s1344-6223(01)00033-5] [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] [Indexed: 11/26/2022]
Abstract
We report a rare case of death due to rescue using a power shovel. A 41-year-old female was accidentally buried alive by a landslide of the earth and sand upon working at a construction site. One of her colleagues started to save her using a power shovel. However, she was dug out dead at the spot about 10 min after the accident with marked head and face injuries. The autopsy disclosed that there was extensive laceration across the face and head with marked skull bone fractures. Around these injuries, extensive hemorrhage could be observed as a vital reaction. Asphyxial death had to be taken into consideration, because she was buried under the earth and sand for about 10 min; but we finally judged that the cause of her death was head injury by the power shovel inflicted during the attempted rescue.
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Affiliation(s)
- K Watanabe-Suzuki
- Department of Legal Medicine, Hamamatsu University School of Medicine, Japan.
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82
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Kamakura S, Sasano Y, Nakajo S, Shimizu T, Suzuki O, Katou F, Kagayama M, Motegi K. Implantation of octacalcium phosphate combined with transforming growth factor-beta1 enhances bone repair as well as resorption of the implant in rat skull defects. J Biomed Mater Res 2001; 57:175-82. [PMID: 11484179 DOI: 10.1002/1097-4636(200111)57:2<175::aid-jbm1156>3.0.co;2-q] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In our previous study, we reported that synthetic octacalcium phosphate (OCP) enhances bone repair if implanted in rat skull defects. We hypothesized that OCP can be used as an effective carrier for transforming growth factor-beta1 (TGF-beta1) to promote bone repair. We designed the present study to investigate histomorphometrically whether combination with recombinant human TGF-beta1 could promote bone repair caused by OCP per se (Control/OCP). A full-thickness standardized trephine defect was made in the rat parietal bone and OCP combined with recombinant human TGF-beta1 (TGF-beta1/OCP) or Control/OCP was implanted into the defect. Four rats from each group were fixed at 2, 4, and 8 weeks after implantation. Histomorphometrical analysis of the percentage of newly formed bone (n-Bone %) and remaining implants (r-Imp %) in the defect was performed. The statistical analysis showed the n-Bone % of TGF-beta1/OCP was significantly higher than that of the Control/OCP in week 4, whereas the r-Imp % of TGF-beta1/OCP was significantly lower than that of the Control/OCP. The present study demonstrated that OCP can be used as an effective carrier for TGF-beta1 and their combination enhances bone repair as well as resorption of the carrier OCP in the early stage of bone formation.
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Affiliation(s)
- S Kamakura
- Division of Stomatology and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, 4-1, Seiryo-Machi, Aoba-Ku, Sendai 980-8575, Japan.
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83
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Iughetti P, Suzuki O, Godoi PH, Alves VA, Sertié AL, Zorick T, Soares F, Camargo A, Moreira ES, di Loreto C, Moreira-Filho CA, Simpson A, Oliva G, Passos-Bueno MR. A polymorphism in endostatin, an angiogenesis inhibitor, predisposes for the development of prostatic adenocarcinoma. Cancer Res 2001; 61:7375-8. [PMID: 11606364] [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: 02/21/2023]
Abstract
We have performed association studies between a novel coding single nucleotide polymorphism (D104N) in endostatin, one of the most potent inhibitors of angiogenesis, and prostate cancer. We observed that heterozygous N104 individuals have a 2.5 times increased chance of developing prostate cancer as compared with homozygous D104 subjects (odds ratio, 2.4; 95% confidence interval, 1.4-4.16). Modeling of the endostatin mutant showed that the N104 protein is stable. These results together with the observation that residue 104 is evolutionary conserved lead us to propose that: (a) the DNA segment containing this residue might contain a novel interaction site to a yet unknown receptor; and (b) the presence of N104 impairs the function of endostatin.
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Affiliation(s)
- P Iughetti
- Centro de Estudos do Genoma Humano, Departamento de Biologia, Instituto de Biociências, USP, São Paulo 05508-900, Brasil
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84
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Kojima T, Ishii A, Watanabe-Suzuki K, Kurihara R, Seno H, Kumazawa T, Suzuki O, Katsumata Y. Sensitive determination of four general anaesthetics in human whole blood by capillary gas chromatography with cryogenic oven trapping. J Chromatogr B Biomed Sci Appl 2001; 762:103-8. [PMID: 11589453 DOI: 10.1016/s0378-4347(01)00348-6] [Citation(s) in RCA: 13] [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] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Four general anaesthetics, sevoflurane, isoflurane, enflurane and halothane, in human whole blood, have been found measurable with very high sensitivity by capillary gas chromatography-flame ionization detection (GC-FID) with cryogenic oven trapping upon injection of headspace (HS) vapor sample. To a 7-ml vial, containing 0.48 ml of distilled water and 20 microl of internal standard solution (5 microg), a 0.5-ml of whole blood sample spiked with or without anaesthetics, was added, and the mixture was heated at 55 degrees C for 15 min. A measure of 10 ml HS vapor was injected into the GC in the splitless mode at -40 degrees C oven temperature, which was programmed up to 250 degrees C. All four peaks were clearly separated; no impurity peaks were found among their peaks. Their extraction efficiencies were about 10%. The calibration curves showed good linearity in the range of 0.5-20 microg/ml; their detection limits were 10-100 ng/ml, which are almost comparable to those by previous reports. The coefficients of intra-day and day-to-day variations were 6.5-9.8 and 7.3-17.2%, respectively. Isoflurane or enflurane was also measured from whole blood samples in which three volunteers inhaled each compound.
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Affiliation(s)
- T Kojima
- Department of Legal Medicine and Bioethics, Nagoya University Graduate School of Medicine, Japan
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85
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Watanabe-Suzuki K, Ishii A, Seno H, Takeuchi Y, Suzuki O. Sensitive determination of styrene and related compounds in human body fluids by headspace capillary gas chromatography with cryogenic oven trapping. Chromatographia 2001. [DOI: 10.1007/bf02491208] [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] [Indexed: 11/29/2022]
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86
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Itoh M, Matsuda J, Suzuki O, Ogura A, Oshima A, Tai T, Suzuki Y, Takashima S. Development of lysosomal storage in mice with targeted disruption of the beta-galactosidase gene: a model of human G(M1)-gangliosidosis. Brain Dev 2001; 23:379-84. [PMID: 11578847 DOI: 10.1016/s0387-7604(01)00244-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [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: 11/28/2022]
Abstract
A deficiency of lysosomal acid beta-galactosidase leads to G(M1)-gangliosidosis in humans, which progressively and profoundly affects the brain and other organs mainly in the early infantile period. We report the pathology of mice with targeted disruption of the beta-galactosidase gene. In the central nervous system, vacuolated neurons appeared in the spinal cord 3 days after birth. The vacuolation extended to neurons in the brainstem, cerebral cortex, hippocampus and thalamus and ballooning neurons became prominent with age. The vacuolation also appeared in Purkinje cells without a marked ballooning change. Reactive astrogliosis in the entire brain was marked at the terminal stage of the disease. Immunohistochemical study using anti-ganglioside G(M1) and G(A1) antibodies revealed extensive accumulation of G(M1) and G(A1) in the cerebral neurons. In the liver, however, accumulation of G(M1) was localized in the cytoplasm of hepatocytes, whereas that of G(A1) was localized in foamy macrophages and Kupffer cells. There were no significant abnormalities in the bone, bone marrow, or cornea at any stage. Although there are some phenotypic and biochemical differences between this knockout mouse and human GM1 gangliosidosis, the mouse will be a useful model for therapeutic trials for the human disease.
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Affiliation(s)
- M Itoh
- Department of Mental Retardation and Birth Defect Research, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawahigashi, Kodaira, 187-8502, Tokyo, Japan.
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87
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Minakata K, Suzuki O, Horio F. Quantification of copper in biological materials by use of electron spin resonance. Clin Chem 2001; 47:1863-5. [PMID: 11568105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- K Minakata
- Department of Legal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu 431-3192, Japan.
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88
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Iyori K, Kamiya K, Suzuki O, Kojima A, Kubota K, Ishimoto T, Kobayashi M, Shindo S, Tada Y. Identification of the critical spinal arteries with F wave-polysynaptic response complex monitoring: an experimental study. J Vasc Surg 2001; 34:330-6. [PMID: 11496287 DOI: 10.1067/mva.2001.114816] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 11/22/2022]
Abstract
PURPOSE The main cause of paraplegia after surgery for descending thoracic aortic aneurysms and thoracoabdominal aortic aneurysms is spinal cord ischemia caused by ligation of the critical spinal arteries that are associated with the great radicular artery (GRA). In this experimental study, we attempted to identify the critical spinal arteries with F wave-polysynaptic response complex (FPC) monitoring. The FPC, which we are using as a monitor of spinal cord ischemia, is myogenic potentials evoked by the tibial nerve stimulation through the anterior horn cells. METHOD In 18 rabbits, infrarenal lumbar arteries were clamped until there was an FPC amplitude reduction (FPCAR) of at least 60%. The rabbits were classified according to the number of arteries clamped to produce the FPCAR (group A, 1 artery; group B, 2 arteries; group C, 3 arteries). Selective angiography of each lumbar artery was performed in all rabbits. RESULTS An FPCAR was observed in all 18 rabbits. In all nine rabbits in group A, the FPCAR was caused by the clamping of one particular lumbar artery. The GRA was shown by means of selective angiography to originate directly from this lumbar artery. In the nine rabbits in groups B and C, 11 FPCARs were observed. Of these, nine FPCARs in nine rabbits were caused by the clamping of lumbar arteries that included the vessel from which the GRA originated. CONCLUSION Temporary clamping of lumbar arteries with FPC monitoring can be used as a means of detecting the critical spinal arteries from which the GRA originates.
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Affiliation(s)
- K Iyori
- Second Department of Surgery, Yamanashi Medical University, Japan.
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89
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Kimori K, Ikuta Y, Ishida O, Ichikawa M, Suzuki O. Free vascularized toe joint transfer to the hand. A technique for simultaneous reconstruction of the soft tissue. J Hand Surg Br 2001; 26:314-20. [PMID: 11469832 DOI: 10.1054/jhsb.2000.0566] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Twelve patients underwent reconstruction of injured finger joints using our technique of a vascularized transfer of the second toe proximal interphalangeal joint. The age of the patients at operation ranged from 7 to 47 years and the postoperative follow-up was 9 to 48 months. All the joint transfers survived and united with resolution of the preoperative joint pain, deformity and instability. The average range of motion of the reconstructed joints was 59 degrees in the proximal interphalangeal and 54 degrees in the metacarpophalangeal joints. No patient complained of pain or functional deficits in the donor foot.
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Affiliation(s)
- K Kimori
- Hiroshima Hand and Microsurgery Center and the Department of Orthopaedic Surgery, Hiroshima University School of Medicine, Hiroshima, Japan.
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90
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Ishii A, Kurihara R, Watanabe-Suzuki K, Kumazawa T, Seno H, Matsushima H, Suzuki O, Katsumata Y. Sensitive determination of pethidine in body fluids by surface ionization organic mass spectrometry. J Chromatogr B Biomed Sci Appl 2001; 758:117-21. [PMID: 11482730 DOI: 10.1016/s0378-4347(01)00049-4] [Citation(s) in RCA: 17] [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] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We have presented a simple and sensitive method for determining pethidine, a narcotic analgesic drug in body fluids by gas chromatography (GC)/surface ionization organic mass spectrometry (SIOMS). Good linearity was obtained in the range of 0.625-25 ng/ml of whole blood and urine by mass chromatography, and in the range of 0.05-2 ng/ml of whole blood by selected ion monitoring (SIM). Pethidine and diphenylpyraline (internal standard) were extracted from body fluids with Bond Elut Certify cartridges; their recoveries were above 95%. The detection limits (signal-to-noise ratio=3) were estimated to be 0.2 ng/ml of whole blood or urine by mass chromatography, 0.02 ng/ml of whole blood by SIM.
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Affiliation(s)
- A Ishii
- Department of Legal Medicine and Bioethics, Nagoya University Graduate School of Medicine, Japan.
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91
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Kamakura S, Sasano Y, Homma H, Suzuki O, Kagayama M, Motegi K. Implantation of octacalcium phosphate nucleates isolated bone formation in rat skull defects. Oral Dis 2001; 7:259-65. [PMID: 11575878] [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: 02/21/2023]
Abstract
OBJECTIVE Our previous radiographic examinations have indicated that the synthetic octacalcium phosphate (OCP) may provide the core for nucleating multiple osteogenic sites in the experimentally created cranial defect. DESIGN The present study was designed to confirm the possibility that the implanted OCP causes the osteoinduction as well as the osteoconduction in the rat cranial defect. MATERIALS AND METHODS Standardized defects were created in male Wistar rat calvaria, and the OCP granules were implanted into the defect. The sham operated rats were processed in the same way except that nothing was implanted. The rats were fixed at 4 weeks after implantation of OCP or the sham operation. We examined bone formed on the implanted OCP, analyzing serial sections histologically combined with immunohistochemistry for the bone specific protein, osteocalcin. RESULTS In the defects treated with OCP, the radiopacity was scattered throughout the defect besides being observed along the defect margin of the parietal bone. Examination of the serial sections showed that some of new bones on the implanted OCP were formed away from the defect margin of the parietal bone with regard to both histological identification and specific molecular marker. CONCLUSIONS The present study suggested that the implanted OCP can serve as a core for initiating bone formation and cause the osteoinduction as well as the osteoconduction in the defect.
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Affiliation(s)
- S Kamakura
- Division of Stomatology and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, Japan.
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92
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Otsuka G, Miyachi S, Handa T, Negoro M, Okamoto T, Suzuki O, Yoshida J. Endovascular trapping of giant serpentine aneurysms by using Guglielmi detachable coils: successful reduction of mass effect. Report of two cases. J Neurosurg 2001; 94:836-40. [PMID: 11354420 DOI: 10.3171/jns.2001.94.5.0836] [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]
Abstract
Giant serpentine aneurysms (GSAs) are defined as partially thrombosed giant aneurysms with persistent serpentine vascular channels. Surgical management of these rare lesions is difficult because of their large size, complex structure, and unique hemodynamics. The authors report two cases of patients harboring GSAs with mass effect, which were managed effectively with endovascular treatment. The first patient was a 48-year-old man who presented with left homonymous hemianopsia caused by a GSA involving the terminal portion of the right internal carotid artery. The second patient, a 10-year-old boy, presented with tetraparesis from compression of the cervicomedullary junction by a GSA of the right vertebral artery. In each case, after confirming collateral flow by temporarily occluding the proximal artery, the aneurysm was trapped by placement of Guglielmi detachable coils at the sites at which the serpentine channels entered and exited the aneurysm. The midportion of each channel was isolated completely without packing, to maximize resorption of the devascularized mass. Mass effect and clinical symptoms rapidly improved in both cases, with no associated morbidity. We recommend endovascular trapping as a safe and effective therapeutic option for GSAs.
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Affiliation(s)
- G Otsuka
- Department of Neurosurgery, Nagoya University School of Medicine, Japan
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93
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Ohtsuka S, Inagaki Y, Tsukada N, Yonei Y, Maeda N, Nakazawa A, Suzuki O, Kiryu Y, Mizuno Y, Osamura Y. [A case of malignant mesothelioma of the pleura and peritoneum with high serum levels of CA15-3]. Nihon Shokakibyo Gakkai Zasshi 2001; 98:675-80. [PMID: 11436286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Affiliation(s)
- S Ohtsuka
- Department of Internal Medicine, Nippon Kokan Hospital
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94
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Miyachi S, Negoro M, Okamoto R, Otsuka G, Suzuki O, Yoshida J. Embolization of arteriovenous malformations prior to radiosurgery. Interv Neuroradiol 2001; 6 Suppl 1:131-7. [PMID: 20667235 DOI: 10.1177/15910199000060s119] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2000] [Indexed: 11/17/2022] Open
Abstract
SUMMARY Embolization prior to radiosurgery is useful to reduce the AVM nidus for adequate planning for radiosurgery. In 37 cases we encountered, patients with the least radiosurgical effects had diffuse type nidus, where the feeders embolized with absorbable embolic materials had the possibility of recanalization. The main purpose of embolization is to prevent bleeding while the radiosurgical effects are being fully obtained. Thus, nidus embolization and the occlusion of fistulous feeders, meningeal feeders and intranidal aneurysms using permanent embolic materials are essential, since effective and successful embolization can increase the occlusion rate and shorten the period until complete occlusion following radiosurgery.
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Affiliation(s)
- S Miyachi
- Department of Neurosurgery and Endovascular Neurosurgery; Nagoya University Graduate School of Medicine; Nagoya, Japan -
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95
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Miyachi S, Negoro M, Okamoto T, Suzuki O, Yoshida J. Effectiveness and pitfall of embolization of cerebral arteriovenous malformations. Interv Neuroradiol 2001; 5 Suppl 1:151-6. [PMID: 20670557 DOI: 10.1177/15910199990050s127] [Citation(s) in RCA: 3] [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] [Received: 09/20/1999] [Accepted: 09/30/1999] [Indexed: 11/17/2022] Open
Abstract
We studied the course ofperisurgical complications of 66 AVMs and discussed the approapriate precautions. Of 66 patients with AVMs, 14 underwent postembolization surgical removal, and 43 underwent radiosurgery. Four patients were cured with total occlusion of their AVM by embolization alone. 48 patients achieved a more than 70% occlusion of the nidus. We observed 12 complications including 3 permanent and 9 temporary. Four complications occurred immediately after the embolization due to overembolization or thromboembolism, and 7 were observed several hours later which might have been caused by retrograde thrombosis or a chemical reaction to the glue. While presurgical embolization deepseated feeders must be embolized along with fistulous or high-flow feeders, 4 cases of 2nd embolization following radiosurgery showed that meningeal feeders developed or recanalized in cases embolized with absorbable particles. Thus, preradiosurgically, fistulous and meningeal feeders should be treated, and the nidus must be packed with embolic materials with no risk of recanalization. Successful nidus packing performed in 10 AVMs yielded a further nidus reduction before radiosurgery. The intranidal aneurysms which pose a high risk of rebleeding were also embolized. In order to avoid complications in the embolization of AVM, the angioarchitecture, hemodynamics and the relationship to brain function should be well recognized by preoperative functional imaging and superselective angiograms, and adequate embolic materials should be properly injected. As an embolization strategy, the priority of the target feeders should depend on the treatment to follow, and aggressive embolization of risky feeders or causing abrupt hemodynamic change should be avoided.
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Affiliation(s)
- S Miyachi
- Department of Neurosurgery, Nagoya University School of medicine; Nagoya, Japan.
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96
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Minakata K, Suzuki O, Saito S, Harada N. A new diquat derivative appropriate for colourimetric measurements of biological materials in the presence of paraquat. Int J Legal Med 2001; 114:1-5. [PMID: 11197611 DOI: 10.1007/s004149900121] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 11/29/2022]
Abstract
A new colourimetric method is described for the quantification of diquat using a yellow-coloured derivative produced by heating diquat in alkaline solution at 80 degrees C. The absorption maximum of the yellow derivative is 420 nm and the molar absorption coefficient is 2.76 x 10(4) (0.15 in 1 microgram diquat/ml with 1 cm light path). The absorption at 420 nm shows a linear concentration dependence in the range 0.1-10 micrograms/ml and fading of the colour is about 5% after 1 h. Under the same conditions, paraquat does not produce any coloured products. The concentration of diquat in the solution containing both diquat and paraquat can be determined by the absorption of diquat derivative at 420 nm without interference from paraquat. By adding sodium dithionite to the solution the concentration of paraquat can be determined by the absorption of paraquat radicals at 600 nm without interference from diquat, because the yellow derivative does not react with dithionite. This yellow diquat derivative can be extracted completely with cyclohexanol by saturating the solution with Na2SO4. The absorption maximum in cyclohexanol shifts to 440 nm with the same molar absorbance and the same half-band width as in water. Fading of the colour is less than 5% after 24 h in cyclohexanol. Perchloric acid (3%) and trichloroacetic acid (4.5%) which are often used for deproteinization of tissue homogenates, do not inhibit production of the coloured derivative at pH 13.5 or extraction of the derivative with cyclohexanol. This method is suitable for a quick determination of small amounts of diquat in tissues, since the extraction with cyclohexanol not only concentrates the derivative rapidly but also quite efficiently eliminates the coloured substances in tissue homogenates. The detection limit of diquat is 0.02 microgram/ml for blood and 0.05 microgram/g for liver when 1 ml or 1 g is used for analysis. In three human cases of fatal intoxication, both paraquat and diquat were quantified using 50 microliters of serum. In non-toxic dosing of diquat to rats for 14 days, the diquat level was highest in the spleen followed by the kidneys.
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Affiliation(s)
- K Minakata
- Department of Legal Medicine, Hamamatsu University School of Medicine, 3600 Handa, Hamamatsu 431-3192, Japan
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97
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Matsuzaki T, Nakazawa A, Otsuka S, Maeda N, Yonei Y, Inagaki Y, Suzuki O, Kiryu Y, Mizuno Y, Ogawa K. [A case of ulcerative colitis (proctitis type) complicated with deep venous thrombosis and treated with heparin successfully]. Nihon Shokakibyo Gakkai Zasshi 2001; 98:300-6. [PMID: 11280908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Affiliation(s)
- T Matsuzaki
- Department of Internal Medidine, Nippon Kokan Hospital
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98
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Abstract
Profenofos and its metabolites were determined in a case of fatal poisoning. Little profenofos and large amounts of metabolites were detected by gas chromatography/flame photometric detection in the acid extracts of blood and urine after methylation with diazomethane. Four major metabolites containing phosphorus were identified with the synthesized metabolites, namely, despropylated profenofos, desethylated profenofos and des-S-propylated profenofos, respectively. 4-Bromo-2-chlorophenol (BCP), an aryl moiety of profenofos, was also determined in blood and urine with high performance liquid chromatograph (HPLC) as free or conjugated metabolites.
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Affiliation(s)
- M Gotoh
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Kanazawa, 061-0293, Ishikari-Tobetsu, Japan
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99
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Kawamoto S, Kita M, Hamada M, Aki T, Shigeta S, Suzuki O, Ono K. Lack of effect of the abnormal fatty acid metabolism in NC/Nga mice on their atopic dermatitis. Biosci Biotechnol Biochem 2001; 65:431-4. [PMID: 11302182 DOI: 10.1271/bbb.65.431] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 11/08/2022]
Abstract
Although clinical evidence has suggested that dysregulated fatty acid metabolism is associated with atopic disorders, the molecular basis for such a correlation remains to be demonstrated. In the present study, we analyzed the fatty acid composition in peripheral blood cells of NC/Nga mice, a model for atopic dermatitis (AD). We found that arachidonic acid significantly accumulated in mice with the AD manifestation. In addition, the leucotriene B4-releasing ability upon calcium ionophore A23187 stimulation was potentiated in blood cells. An arachidonic acid accumulation was not apparent in the non-atopic BALB/c strain, but was still observed in healthy NC/Nga mice fed under specific pathogen-free conditions. These results indicate that a disturbed fatty acid metabolism in NC/Nga mice was not a trigger factor for their dermatitis development.
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Affiliation(s)
- S Kawamoto
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Japan.
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100
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Kondo K, Lee XP, Kumazawa T, Sato K, Watanabe-Suzuki K, Seno H, Suzuki O. Sensitive determination of n-hexane and cyclohexane in human body fluids by capillary gas chromatography with cryogenic oven trapping. J AOAC Int 2001; 84:19-23. [PMID: 11234809] [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: 02/19/2023]
Abstract
A sensitive method was developed for determination of n-hexane and cyclohexane in human body fluids by headspace capillary gas chromatography (GC) with cryogenic oven trapping. Whole blood and urine samples containing n-hexane and cyclohexane were heated in a 7.5 mL vial at 70 degrees C for 15 min, and 5 mL of the headspace vapor was drawn into a glass syringe. All vapor was introduced through an injection port of a GC instrument in the splitless mode into an Rtx-Volatiles middle-bore capillary column at an oven temperature of -40 degrees C for trapping volatile compounds. The oven temperature was programmed to 180 degrees C for GC with flame ionization detection. These conditions gave sharp peaks for both n-hexane and cyclohexane, a good separation of each peak, and low background impurities for whole blood and urine. The extraction efficiencies of n-hexane and cyclohexane were 13.2-30.3% for whole blood and 12.7-20.7% for urine. The coefficients of within-day variation in terms of extraction efficiency of both compounds were 5.0-9.5% for whole blood and 3.8-10.8% for urine; those of day-to-day variation for the compounds were not greater than 16.6%. The regression equations for n-hexane and cyclohexane showed good linearity in the range of 5-500 ng/0.5 mL for whole blood and urine. The detection limits (signal-to-noise ratio = 3) for both compounds were 1.2 and 0.5 ng/0.5 mL for whole blood and urine, respectively. The data on n-hexane or cyclohexane in rat blood after inhalation of each compound are also presented.
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Affiliation(s)
- K Kondo
- Showa University School of Medicine, Department of Legal Medicine, Tokyo, Japan
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