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Kato H, Kanematsu M, Ando K, Mizuta K, Ito Y, Hirose Y, Hoshi H. Ossifying pleomorphic adenoma of the parotid gland: a case report and review. ACTA ACUST UNITED AC 2008; 51 Suppl:B173-5. [PMID: 17991056 DOI: 10.1111/j.1440-1673.2007.01795.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pleomorphic adenoma is the most common parotid gland neoplasm and occasionally arises from the deep lobe of the parotid gland with extension into the parapharyngeal space. However, ossification of pleomorphic adenoma is rare, although chondroid and myxochondroid tissue formation is frequently seen histologically. We report an unusual case of ossifying pleomorphic adenoma arising from the deep lobe of the parotid gland in the parapharyngeal space.
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Affiliation(s)
- H Kato
- Department of Radiology, Gifu University School of Medicine, Gifu, Japan.
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52
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Saijo M, Suzutani T, Mizuta K, Kurane I, Morikawa S. Characterization and susceptibility to antiviral agents of herpes simplex virus type 1 containing a unique thymidine kinase gene with an amber codon between the first and the second initiation codons. Arch Virol 2007; 153:303-14. [DOI: 10.1007/s00705-007-1096-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2007] [Accepted: 10/29/2007] [Indexed: 11/29/2022]
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53
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Abstract
An elevation of plasma vasopressin levels has been frequently observed in Meniere's disease patients. However, little is known regarding the mechanism behind this elevation. The plasma vasopressin levels and plasma osmolality were therefore determined in 18 diagnosed Meniere's disease patients and 20 patients with other types of vertigo, who required admission for severe vertigo attacks. All participants were given questionnaires regarding their clinical and psychological status, including their stress levels and depression status, to evaluate environmental stress events. The plasma vasopressin levels of Meniere's disease patients in the acute phase (4.1 +/- 1.37 pg/ml) were significantly higher compared with with those of other vertigo patients in the acute phase (2.1 +/- 0.41 pg/ml) (P < 0.01). The average plasma osmolality of the Meniere's disease group was higher than that of the other vertigo patients group (P < 0.05). No significant difference in reported stress levels, depression status and prevalence of primary headache between the groups was observed. The plasma vasopressin showed no significant correlation with the patients' clinical data (occurrence of emesis or nausea, prevalence of primary headache, depression status and stress). No correlation between the plasma vasopressin and the plasma osmolarity was observed in the Meniere's disease group. These results suggest that the elevation of plasma vasopressin in the acute phase of Meniere's disease is therefore related to the pathogenesis of Meniere's attacks, and the results obtained may provide helpful information for distinguishing between Meniere's disease and other various inner ear diseases.
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Affiliation(s)
- M Aoki
- Department of Otolaryngology, Gifu University Graduate School of Medicine, Gifu City, Japan.
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54
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Abiko C, Mizuta K, Itagaki T, Katsushima N, Ito S, Matsuzaki Y, Okamoto M, Nishimura H, Aoki Y, Murata T, Hoshina H, Hongo S, Ootani K. Outbreak of human metapneumovirus detected by use of the Vero E6 cell line in isolates collected in Yamagata, Japan, in 2004 and 2005. J Clin Microbiol 2007; 45:1912-9. [PMID: 17460056 PMCID: PMC1933089 DOI: 10.1128/jcm.01251-06] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A number of epidemiological studies have shown human metapneumovirus (hMPV) to be one of the most important viral agents associated with acute respiratory infections in humans. However, due to the difficulty in growing the virus, all epidemiological studies of hMPV infection have been performed on the basis of the molecular method. Thus, the development of a cell line suitable for the isolation of hMPV from clinical specimens is a crucial step for further research. Using the Vero E6 cell line, which could be stably maintained for 1 month without passage or medium change, we succeeded in isolating 79 strains from 4,112 specimens obtained in Yamagata, Japan, in 2004 and 2005. The total isolation rate was 1.9% (79/4,112). The monthly distribution revealed that hMPV infections occurred between February and April in 2004 and throughout most of the year in 2005. Phylogenetic analysis indicated that subgenogroup B2 was predominant in 2004, whereas three subgenogroups, A2, B1, and B2, had cocirculated in 2005. Although multiple subgenogroups cocirculated in 2005, each individual subgenogroup strain was found to predominate at specific sites. An infectivity assay of hMPV strains also indicated that the infection efficiency in Vero E6 cells was better than that in LLC-MK2 cells. Finally, we found that Vero E6 cells are useful for the isolation of hMPVs and that this utility might aid further research into hMPVs beyond the epidemiological data shown in this study.
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Affiliation(s)
- C Abiko
- Department of Microbiology, Yamagata Prefectural Institute of Public Health, Tokamachi, Yamagata 990-0031, Japan
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55
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Mizuta K, Mizuta F, Takahashi M, Ishii H, Niioka T, Izumi H. Effects of isoflurane on parasympathetic vasodilatation in the rat submandibular gland. J Dent Res 2006; 85:379-83. [PMID: 16567563 DOI: 10.1177/154405910608500419] [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: 11/16/2022] Open
Abstract
Volatile anesthetics have been known to suppress parasympathetic reflex vasodilatation in the lower lip and palate. However, in the submandibular gland, little is known about the effects of these anesthetics on the parasympathetic vasodilatation elicited by reflex and direct (i.e., non-reflex) activation of the parasympathetic vasodilator mechanisms. Although both parasympathetic vasodilatations were inhibited by isoflurane in a concentration- and time-dependent manner, the effects of continuous administration of the alpha(1)-adrenoceptor agonist methoxamine were markedly different: The reflex vasodilatation was not affected by methoxamine, while the direct vasodilatation was significantly reduced. Picrotoxin (GABA(A) receptor antagonist) attenuated the inhibitory effect of isoflurane on direct vasodilatation and the systemic arterial blood pressure. These findings suggest that the isoflurane-induced inhibitory effects on direct vasodilatation are produced by a decrease of peripheral vascular tone by GABAergic mechanisms, whereas those on the reflex vasodilatation are produced exclusively by the inhibition of the reflex center.
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Affiliation(s)
- K Mizuta
- Division of Dento-Oral Anesthesiology, Tohoku University Graduate School of Dentistry, Aoba, Sendai, 980-8575, Japan
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Abstract
OBJECTIVES An elevation of the plasma antidiuretic hormone (ADH) levels has frequently been observed in Meniere's disease patients. However, little is known regarding the mechanism behind such an elevation of ADH level in Meniere's disease patients. Therefore, we measured the plasma ADH in Meniere's disease patients and other vertigo patients to elucidate the association between the ADH levels, stress levels and the development of Meniere's symptom. DESIGN AND SETTING The plasma ADH levels and plasma osmotic pressure were determined in 23 definite Meniere's disease patients and 160 patients with other types of vertigo/dizziness. All participants were administered questionnaire regarding their psychological status including their stress levels. RESULTS The ADH levels of Meniere's disease patients in the acute phase (5.80 +/- 1.37 pg/mL) were significantly higher in comparison with that of Meniere's disease patients in the remission phase (2.26 +/- 0.41 pg/mL) (P < 0.05). In other peripheral vertigo patients, the ADH level in the acute phase (1.71 +/- 0.23 pg/mL) was not significantly different from that in the remission phase (1.45 +/- 0.15 pg/mL). Meniere's disease patients in the acute phase had a significantly higher stress score (114 +/- 23) than Meniere's disease patients in the remission phase (56 +/- 13) (P < 0.05). However, there was no significant correlation between their stress score and the ADH levels. CONCLUSIONS These results suggest that the elevation of the plasma ADH levels in Meniere's disease patients in the acute phase is, therefore, associated with the pathogenesis of Meniere's disease attacks rather than with stress.
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Affiliation(s)
- M Aoki
- Otolaryngology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu, Gifu 501-1194, Japan.
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Abstract
OBJECTIVES Stress is involved in the development of symptoms of Meniere's disease (MD). Stress-related disease has been reported to be associated with disorders in the circadian rhythm of melatonin (MEL) which regulates that rhythm. We therefore investigated MEL circadian rhythm of patients with MD. PATIENTS AND METHODS A comparison of 13 MD patients was made with age-matched controls. Saliva samples were collected every 3 h. A statistical analysis of the circadian rhythm of saliva MEL was performed for a circadian rhythm by the fit of a 24- and 12-h composite cosine model. In addition, we assessed the stress and depression status of the two groups. RESULTS The rhythmic amplitude of MEL in the MD group was significantly lower than that in the control group (P < 0.05). The acrophase in the MD group was significantly earlier than that in the control group (P < 0.05). MD patients had significantly higher stress score and depression score than control subjects (P < 0.05). The amplitude in MD patients had no significant correlation with their otologic clinical data. CONCLUSIONS These results suggest that MD patients have a MEL deficiency, which is related to their stress and depression status rather than the otologic pathological status of MD.
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Affiliation(s)
- M Aoki
- Department of Otolaryngology, Gifu University Graduate School of Medicine, Gifu, Japan.
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58
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Mizuta K, Abiko C, Murata T, Matsuzaki Y, Itagaki T, Sanjoh K, Sakamoto M, Hongo S, Murayama S, Hayasaka K. Frequent importation of enterovirus 71 from surrounding countries into the local community of Yamagata, Japan, between 1998 and 2003. J Clin Microbiol 2006; 43:6171-5. [PMID: 16333123 PMCID: PMC1317214 DOI: 10.1128/jcm.43.12.6171-6175.2005] [Citation(s) in RCA: 135] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Phylogenetic analysis of 45 enterovirus 71 (EV71) isolates for 6 years in Yamagata, Japan, clarified that the annual outbreak of hand-foot-and-mouth disease was due to four genetically distinct subgenogroups, including a novel "B5." Our results suggest that the importation of EV71 from surrounding countries has had a major epidemiological impact on the local community used in our study.
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Affiliation(s)
- K Mizuta
- Department of Microbiology, Yamagata Prefectural Institute of Public Health, Tokamachi 1-6-6, Yamagata, 990-0031 Japan.
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59
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Kido K, Mizuta K, Mizuta F, Yasuda M, Igari T, Takahashi M. Coronary vasospasm during the reversal of neuromuscular block using neostigmine. Acta Anaesthesiol Scand 2005; 49:1395-6. [PMID: 16146484 DOI: 10.1111/j.1399-6576.2005.00832.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Murata K, Mizuta K, Imazu K, Terasawa F, Taki M, Endoh T. The prevalence of Toxoplasma gondii antibodies in wild and captive cetaceans from Japan. J Parasitol 2004; 90:896-8. [PMID: 15357097 DOI: 10.1645/ge-197r] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The seroprevalence of Toxoplasma gondii was investigated in wild and captive cetaceans from Japan. Antibodies against T. gondii were examined by both latex agglutination test (LAT) and indirect hemagglutination test (IHAT) for 77 serum or plasma samples obtained from 59 individuals of 6 species, including 2 hybrids. Antibody titers greater than 1:64 in LAT and greater than 1:640 in IHAT, indicative of the presence of T. gondii, were found in 11.9% of 59 individuals. In 7 samples that showed a positive reaction by IHAT, T. gondii titers were examined for each immunoglobulin (Ig) fraction separated by sucrose gradient centrifugation. The antibody peaks in each fraction were divided into 3 types, thought to be a reaction of IgM (type 1), IgG (type 2), and IgM with IgG (type 3). Type 1 was found in serum from a bottle-nosed dolphin (Tursiops truncatus) and a killer whale (Orcinus orca) sampled soon after capture off the Japanese coast in 1988; it was concluded that infection in the wild had occurred less than 15 yr before the study was performed. The prevalence of putative IgM and IgG antibodies from a captive-bred T. truncatus suggested that T. gondii infection also occurred in the aquarium.
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Affiliation(s)
- K Murata
- Department of Wildlife Science, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-8510, Japan.
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61
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Mizuta K, Itagaki T, Abiko C, Murata T, Takahashi T, Murayama S. Epidemics of two Victoria and Yamagata influenza B lineages in Yamagata, Japan. Epidemiol Infect 2004; 132:721-6. [PMID: 15310174 PMCID: PMC2870153 DOI: 10.1017/s0950268804002237] [Citation(s) in RCA: 3] [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: 11/07/2022] Open
Abstract
We attempted to predict epidemics of influenza B, focusing on B/Victoria/2/87-like (V) and B/Yamagata/16/88-like (Y) lineages, in Yamagata, Japan. We collected 9624 nasopharyngeal swabs for virus isolation from patients with respiratory infections between 1996 and 2003 and 237 sera for seroepidemiological analysis by haemagglutination-inhibition test in 2001. We isolated 424 V-lineage and 246 Y-lineage viruses during the study period. Three herald viruses in the 2000--2001 season enabled us to predict a V-lineage epidemic in the following season. However, another V-lineage epidemic occurred in the 2002--2003 season, although we caught four herald Y-lineage viruses, whose antigenic drift was suggested by seroepidemiological study, at the end of the previous season. Since the epidemiology of the two influenza B lineages remains unclear, a careful watch should be kept on these lineages in order to provide effective public-health strategies against future epidemics.
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Affiliation(s)
- K Mizuta
- Department of Microbiology, Yamagata Prefectural Institute of Public Health, Tokamachi, Yamagata, Japan
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62
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Matsuzaki Y, Takao S, Shimada S, Mizuta K, Sugawara K, Takashita E, Muraki Y, Hongo S, Nishimura H. Characterization of antigenically and genetically similar influenza C viruses isolated in Japan during the 1999-2000 season. Epidemiol Infect 2004; 132:709-20. [PMID: 15310173 PMCID: PMC2870152 DOI: 10.1017/s0950268804002146] [Citation(s) in RCA: 22] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Between October 1999 and May 2000, a total of 28 strains of influenza C virus were isolated in four Japanese prefectures: Yamagata, Miyagi, Saitama and Hiroshima. Antigenic analysis showed that the 28 isolates were divided into three distinct antigenic groups, and viruses belonging to different antigenic groups were co-circulating in each of the four prefectures. Phylogenetic analysis of the seven protein genes demonstrated that the viruses having a similar genome composition spread in various areas of Japan during the same period. Furthermore, phylogenetic analysis showed that most of the influenza C viruses isolated in various areas of the world between the 1970s and 1980s were closely related to the contemporary Japanese viruses in all gene segments. These observations suggest that the influenza C viruses cause epidemics in some communities during the same season and that antigenically and genetically similar influenza C viruses spread throughout Japan and may be circulating worldwide.
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Affiliation(s)
- Y Matsuzaki
- Department of Bacteriology, Yamagata University School of Medicine, Iida-Nishi, Yamagata, Japan
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63
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Kaneko J, Sugawara Y, Akamatsu N, Kishi Y, Niiya T, Kokudo N, Makuuchi M, Mizuta K. Prediction of hepatic artery thrombosis by protocol Doppler ultrasonography in pediatric living donor liver transplantation. ACTA ACUST UNITED AC 2004; 29:603-5. [PMID: 15162231 DOI: 10.1007/s00261-003-0156-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [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: 11/24/2022]
Abstract
Hepatic arterial thrombosis (HAT) after liver transplantation is a life-threatening event. Previous reports have suggested that the resistive index (RI) of the hepatic artery predicts HAT. Doppler ultrasonography (US) to measure RI, however, is not routinely performed. The subjects were 70 pediatric patients who underwent living donor liver transplantation (LDLT). Protocol Doppler US was performed once or twice a day for 2 weeks postoperatively and 692 records were examined. Changes in RI values were examined separately in patients with and without HAT complications. The incidence of HAT was 10% (seven of 70). HAT was diagnosed an average of 6.2 days after LDLT. In patients without HAT complications ( n = 63), average RI levels at 14 days after LDLT were 0.71 +/- 0.1 (records, n = 625). In patients with HAT complications, RI decreased gradually within 2 days before the onset of HAT. RI values of less than 0.6 predicted HAT within 2 days before onset, with 83% sensitivity and 85% specificity. RI during the first 2 weeks after LDLT is a sensitive predictor for HAT. Thrombectomy and reanastomosis should be considered when RI values are less than 0.6 in Doppler US.
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Affiliation(s)
- J Kaneko
- Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
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Kitamura T, Mizuta K, Kawarasaki H, Sugawara Y, Makuuchi M. Severe hemolytic anemia related to production of cold agglutinins following living donor liver transplantation: a case report. Transplant Proc 2003; 35:399-400. [PMID: 12591458 DOI: 10.1016/s0041-1345(02)03816-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- T Kitamura
- Department of Pediatric Surgery and Transplantation Surgery, Jichi Medical School, Tochigi, Japan
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65
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Affiliation(s)
- K Mizuta
- Department of Pediatric Surgery and Transplantation Surgery, Center for Molecular Medicine, Jichi Medical School, Tochigi, Japan.
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66
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Matsuzaki Y, Mizuta K, Sugawara K, Tsuchiya E, Muraki Y, Hongo S, Suzuki H, Nishimura H. Frequent reassortment among influenza C viruses. J Virol 2003; 77:871-81. [PMID: 12502803 PMCID: PMC140804 DOI: 10.1128/jvi.77.2.871-881.2003] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2002] [Accepted: 10/04/2002] [Indexed: 11/20/2022] Open
Abstract
In a 9-year survey from December 1990 to December 1999 in Sendai City, Japan, we succeeded in isolating a total of 45 strains of influenza C virus. These 45 strains were isolated in clusters within 4 months in a year, especially from winter to early summer. Previous studies of the hemagglutinin-esterase genes of various influenza C virus isolates revealed the existence of five distinct virus lineages (Aichi/1/81-, Yamagata/26/81-, Mississippi/80-, Sao Paulo/82-, and Kanagawa/1/76-related lineage) in Japan between 1970 and the early 1990s (Y. Matsuzaki, K. Mizuta, H. Kimura, K. Sugawara, E. Tsuchiya, H. Suzuki, S. Hongo, and K. Nakamura, J. Gen. Virol. 81:1447-1452, 2000). Antigenic and genetic analyses of the 45 strains showed that they could be divided into these five virus lineages and a few antigenic groups were cocirculating in Sendai City. In 1990 and 1991 the dominant antigenic group was the Aichi/1/81 virus group, and in 1992 it was Yamagata/26/81 virus group. The Mississippi/80 virus group was isolated from 1993 to 1996, and the Yamagata/26/81 virus group reemerged in 1996 and continued to circulate until 1999. This finding led us to a speculation that the replacement of the dominant antigenic groups had occurred by immune selection within the human population in the restricted area. Phylogenetic analysis of seven RNA segments showed that 44 viruses among the 45 strains isolated in our surveillance work were reassortant viruses that have various genome compositions distinguishable from those of the reference strains of the each lineage. This observation suggests that the reassortment between two different influenza C virus strains occurs frequently in nature and the genome composition of influenza C viruses may influence their ability to spread in humans.
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Affiliation(s)
- Y Matsuzaki
- Department of Bacteriology, Yamagata University School of Medicine, Japan.
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68
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Mizuta K, Hishikawa S, Hirota M, Miyamoto G, Fujimura A, Hakamata Y, Kobayashi E. Fluoroquinolone concentrations in plasma, urine, and bile after oral administration in rats with renal failure: useful technique for long-term bile collection. J Med 2002; 32:311-20. [PMID: 11958277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Using a previously reported technique for bile collection, we studied the pharmacokinetics of levofloxacin (LVFX) and grepafloxacin (GPFX) in normal rats and in animals with renal failure. Continuous bile drainage was performed using normal and renal-failure Wistar rats. Oral GPFX or LVFX (40 mg/Kg) was administered. The drug concentrations in plasma, urine, and bile were determined by high-performance liquid chromatography. The area under the blood concentration-time curve (AUC) in each renal-failure rat was calculated. There were no significant differences in GPFX concentrations in the serum, urine, and bile between the renal-failure and normal rats, but the LVFX level in the urine of the renal-failure group was statistically significantly lower than in the normal group. The AUC of GPFX had an opposite correlation with the degree of renal failure, but that of LVFX was correlated.
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Affiliation(s)
- K Mizuta
- Department of Clinical Pharmacology, Center for Molecular Medicine, Jichi Medical School, Tochigi, Japan
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69
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Matsuzaki Y, Sugawara K, Mizuta K, Tsuchiya E, Muraki Y, Hongo S, Suzuki H, Nakamura K. Antigenic and genetic characterization of influenza C viruses which caused two outbreaks in Yamagata City, Japan, in 1996 and 1998. J Clin Microbiol 2002; 40:422-9. [PMID: 11825952 PMCID: PMC153379 DOI: 10.1128/jcm.40.2.422-429.2002] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2001] [Revised: 09/11/2001] [Accepted: 11/29/2001] [Indexed: 11/20/2022] Open
Abstract
During the 3 years from January 1996 to December 1998, a total of 33 strains of influenza C virus were isolated from 10,726 throat swab specimens collected from children with acute respiratory illness who visited two pediatric clinics in Yamagata City, Japan. These 33 strains were isolated in clusters during two different periods, 20 strains in May to August 1996 and the remaining 13 in March to June 1998. Antigenic analysis with monoclonal antibodies to the hemagglutinin-esterase (HE) glycoprotein and phylogenetic analysis of seven RNA segments showed that the 33 influenza C viruses isolated were antigenically and genetically similar and that they were reassortant viruses which had obtained PB2, PB1, HE, M, and NS genes from a C/pig/Beijing/115/81-like virus and P3 and NP genes from a C/Mississippi/80-like virus. These observations suggest strongly that during the survey period of 3 years, two outbreaks of influenza C occurred in Yamagata City, both of which were caused by a reassortant virus having the genome composition described above.
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Affiliation(s)
- Y Matsuzaki
- Department of Bacteriology, Yamagata University School of Medicine, Iida-Nishi, Yamagata 990-9585, Japan.
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Muyanga J, Matsuzaki Y, Sugawara K, Kimura K, Mizuta K, Ndumba I, Muraki Y, Tsuchiya E, Hongo S, Kasolo FC, Numazaki Y, Nakamura K. Antigenic and genetic analyses of influenza B viruses isolated in Lusaka, Zambia in 1999. Arch Virol 2002; 146:1667-79. [PMID: 11699954 DOI: 10.1007/s007050170055] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Previous studies of the hemagglutinin (HA) genes of various influenza B virus isolates demonstrated the existence of two antigenically distinct virus lineages represented by B/Victoria/2/87 and B/Yamagata/16/88, respectively. Here, we investigated the antigenic and genetic characteristics of influenza B viruses isolated from children living in Lusaka, Zambia between January and May 1999. Antigenic analysis with chicken antiviral sera showed that all the Zambian isolates had the HA protein belonging to B/Yamagata/16/88-related lineage. Furthermore, phylogenetic analyses of the eight RNA segments performed by using the total or partial nucleotide sequences of the two representative Zambian strains (B/Lusaka/270/99 and B/Lusaka/432/99) as well as the previously reported sequences suggested that the Zambian viruses are closely related to the recently circulating reassortants represented by B/Shiga/T30/98 and B/Yamanashi/166/98 which acquired the genes coding for three polymerase proteins (PB2, PB1, and PA), HA, nucleoprotein, and matrix protein from a B/Yamagata/16/88-like parent and the gene encoding nonstructural proteins (NS1 and NS2) from a B/Guandong/8/93-like parent.
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Affiliation(s)
- J Muyanga
- Department of Microbiology and Pathology, University Teaching Hospital, Lusaka, Zambia
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Sugawara Y, Mizuta K, Kawarasaki H, Takayama T, Imamura H, Makuuchi M. Risk factors for acute rejection in pediatric living related liver transplantation: the impact of HLA matching. Liver Transpl 2001; 7:769-73. [PMID: 11552209 DOI: 10.1053/jlts.2001.27089] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The influence of HLA compatibility on acute rejection in cadaveric liver transplantation is not clearly defined, and that in living related liver transplantation (LRLT) has only been poorly examined. Few studies have focused solely on a pediatric population. Fifty-eight cases of pediatric LRLT were analyzed. Patient and graft survival rates and postoperative complications were assessed. The relationship between the incidence of acute rejection and HLA matching and some preoperative and intraoperative transplant recipient factors, including age, preoperative aspartate aminotransferase level, total bilirubin level, prothrombin time, ascites, donor-recipient blood group type and sex match, donor age, surgical time, anhepatic phase duration, volume of blood loss, and graft weight to standard liver volume, was examined. Patients with HLA-A zero mismatching (P =.04) or a greater volume of blood loss per body weight (P =.004) had a significantly lower chance of rejection within 6 weeks after LRLT. Our results show that in LRLT, a graft from an HLA-A zero-mismatched donor may be advantageous because it provides a lower chance of early acute rejection.
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Affiliation(s)
- Y Sugawara
- Liver Transplantation Team, University of Tokyo, Tokyo, Japan.
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72
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Abstract
Congenital anatomic anomalies often present technical obstacles during liver transplantation. Biliary atresia (BA) is the most common indication for liver transplantation in children, and up to 28% of children with situs inversus are complicated by BA. A boy aged 2 years 11 months with BA, situs inversus, and dextrocardia received a liver transplant from his father. The donor also had situs inversus and dextrocardia without other anomalies. Graft function was excellent postoperatively, and no significant complications were encountered. This is only the second report of the successful use of a living related donor graft for a patient with BA and situs inversus. This case was particularly rare because the donor also had situs inversus, which made the present procedure more feasible.
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Affiliation(s)
- Y Sugawara
- Liver Transplant Team, University of Tokyo, Tokyo, Japan.
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73
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Miyoshi K, Miyakawa T, Mizuta K. Repression of rRNA synthesis due to a secretory defect requires the C-terminal silencing domain of Rap1p in Saccharomyces cerevisiae. Nucleic Acids Res 2001; 29:3297-303. [PMID: 11504866 PMCID: PMC55856 DOI: 10.1093/nar/29.16.3297] [Citation(s) in RCA: 18] [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] [Indexed: 11/13/2022] Open
Abstract
A secretory defect causes specific transcriptional repression of both ribosomal protein and ribosomal RNA genes, suggesting the coupling of plasma membrane and ribosome syntheses. We previously reported that the rap1-17 allele, which produced C-terminally truncated Rap1p, derepressed transcription of ribosomal protein genes when the secretory pathway was blocked. In this paper, we demonstrate that the rap1-17 mutation also leads to significant attenuation of transcriptional repression of rRNA genes due to a secretory defect. In contrast, the rap1-2 temperature-sensitive allele containing a unique missense mutation in the middle of the coding sequence has only a weak effect on repression. These results suggest that the C-terminal silencing domain of Rap1p is required for transcriptional repression of rDNA in response to a secretory defect. We also demonstrated that transcriptional regulation of ribosomal protein genes in response to nitrogen limitation was not affected by the rap1-17 allele, suggesting that the mechanism of nitrogen response is distinct from that of the secretory response.
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MESH Headings
- Alleles
- DNA, Ribosomal/genetics
- DNA-Binding Proteins/chemistry
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/metabolism
- Fungal Proteins/chemistry
- Fungal Proteins/genetics
- Fungal Proteins/metabolism
- Gene Expression Regulation, Fungal
- Gene Silencing
- Genes, Fungal/genetics
- Mutation/genetics
- Nitrogen/metabolism
- Protein Structure, Tertiary
- Protein Transport
- RNA, Fungal/analysis
- RNA, Fungal/biosynthesis
- RNA, Fungal/genetics
- RNA, Ribosomal/analysis
- RNA, Ribosomal/biosynthesis
- RNA, Ribosomal/genetics
- Saccharomyces cerevisiae/genetics
- Saccharomyces cerevisiae/growth & development
- Saccharomyces cerevisiae/metabolism
- Saccharomyces cerevisiae Proteins
- Shelterin Complex
- Telomere-Binding Proteins
- Temperature
- Transcription Factors
- Transcription, Genetic/genetics
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Affiliation(s)
- K Miyoshi
- Graduate School of Biosphere Sciences and Graduate School of Advanced Sciences of Matter, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Japan
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74
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Sugawara Y, Makuuchi M, Takayama T, Imamura H, Dowaki S, Mizuta K, Kawarasaki H, Hashizume K. Small-for-size grafts in living-related liver transplantation. J Am Coll Surg 2001; 192:510-3. [PMID: 11294408 DOI: 10.1016/s1072-7515(01)00800-6] [Citation(s) in RCA: 170] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND The problems associated with small-for-size grafts in living-related liver transplantation are not fully understood. STUDY DESIGN A consecutive series of 79 patients underwent 80 living-related liver transplantation procedures, including one retransplant, at the University of Tokyo from January 1996 to January 2000. They were divided into two groups by graft size: graft weight/recipient standard liver volume ratios of 40% or less (n = 24), and more than 40% (n = 56). Preoperative status, mortality, morbidity, duration of hospital stay, and postoperative graft function were examined and compared between the groups. RESULTS The rate of patients who were restricted to the intensive care unit preoperatively was comparable between the groups (33% versus 21%, p = 0.27). The mean standard liver volume ratios were 37% in the small graft group and 84% in the large group. Survival rates were 80% (5 of 24) for the small graft group, which was significantly lower than that for the large group (96%, 54 of 56, p = 0.02). The rate of acute rejection was comparable between the groups (33% versus 43%, p = 0.47). Vascular complication was observed in 17% of the small graft group patients and 23% of the large group (p = 0.77). No difference was observed in the frequency of bile leakage or bile duct stenosis (25% versus 21%, p=0.77). Hyper-bilirubinemia and elongation of prothrombin time persisted longer in the small graft group than in the large group (p < 0.0001 for both). CONCLUSIONS Our surgical results may suggest that a graft weight ratio of 40% or less provides a lower chance of survival after living-related liver transplantation.
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Affiliation(s)
- Y Sugawara
- Liver Transplant Team, University of Tokyo, Japan
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75
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Abstract
This study was designed to evaluate the role of endogenous nitric oxide (NO) in focal microcirculation disorder of the guinea pig cochlea. Focal microcirculation disorder was induced by a photochemical reaction at the lateral wall of the second cochlear turn. Saline or N omega-nitro-L-arginine methyl ester (L-NAME) was administered before the onset of photochemical reaction. Cochlear blood flow (CBF) was measured at the focal lesion (ischemic core), 1 mm from the lesion in the apical and basal direction (ischemic border zone) by using a novel non-contact laser blood flowmeter. NO synthase activities were measured by radioenzymeassay. In the saline pretreatment group, CBF was significantly decreased to 58.8+/-4.4% of the baseline at the ischemic core 30 min after the onset of photochemical reaction (P<0.01), while CBF showed no significant change at the ischemic border zone. In the L-NAME pretreatment group, CBF was significantly decreased not only at the focal lesion (48.3+/-6.5%, P<0.01), but also at the ischemic border zone (apical, 49.3+/-2.3%, P<0.05; basal, 58.7+/-7.1%, P<0.05, respectively). NO synthase III activity of cochlea was increased significantly (P<0.01) 15 min after microcirculation disorder. These findings suggest that formation of endogenous NO plays a key role in the maintenance of CBF in acute focal cochlear microcirculation disorder.
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Affiliation(s)
- M Nagura
- Department of Otolaryngology, Hamamatsu University School of Medicine, Japan.
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76
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Hirata M, Harihara Y, Kitamura T, Hisatomi S, Kato M, Dowaki S, Mizuta K, Sugawara Y, Kita Y, Kubota K, Takayama T, Kawarasaki H, Hashizume K, Makuuchi M. The influence of donor age to graft volume increase rate in living donor liver transplantation. Transplant Proc 2001; 33:1416-7. [PMID: 11267353 DOI: 10.1016/s0041-1345(00)02534-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- M Hirata
- Liver Transplantation Team, University of Tokyo, Tokyo, Japan
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77
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Sugawara Y, Makuuchi M, Takayama T, Mizuta K, Kawarasaki H, Imamura H, Hashizume K. Liver transplantation using a right lateral sector graft from a living donor to her granddaughter. Hepatogastroenterology 2001; 48:261-3. [PMID: 11268980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
One of the major concerns regarding living-related liver transplantation is graft-size disparity. The left liver graft is too small while the right is too large in some recipients. To overcome this problem, the right lateral sector (Segments VI and VII) was transplanted from a living donor (55 kg) to her granddaughter (17 kg). The common hepatic trunk had to be anastomosed end-to-end to the graft hepatic vein without being compressed by the graft overriding the vena cava and without unfavorable tension of the anastomosis. The anterior wall of the hepatic vein of the donor was resected as much as possible. The superficial left, left, middle and right hepatic veins of the recipient were made confluent by incision of the intervening venous walls, and the nicks were sutured to form a wide and long common venous trunk. The recipient received a graft corresponding to 75% of her standard liver volume. She was complicated with gastric dilation and acute rejection, but recovered with no signs of anastomotic stricture. Right lateral sector graft obtained by this innovative procedure may be useful for overcoming borderline graft-recipient size and shape differences.
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Affiliation(s)
- Y Sugawara
- Liver Transplant Team, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
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78
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Harihara Y, Makuuchi M, Kawarasaki H, Takayama T, Kubota K, Ito M, Mizuta K, Yoshino H, Hirata M, Kita Y, Sano K, Hisatomi S, Kusaka K, Miura Y, Taniai N, Asato H, Nakatsuka T, Hashizume K. Living-related liver transplantation in adults compared with children. Transplant Proc 2000; 32:2160-1. [PMID: 11120113 DOI: 10.1016/s0041-1345(00)01615-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Y Harihara
- Liver Transplant Team, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan
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79
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Hirata M, Harihara Y, Kita Y, Hisatomi S, Miura Y, Yoshino H, Mizuta K, Ito M, Sano K, Kusaka K, Kawarasaki H, Kubota K, Takayama T, Hashizume K, Makuuchi M. Impact of HLA matching in living-related liver transplantation. Transplant Proc 2000; 32:2108-9. [PMID: 11120090 DOI: 10.1016/s0041-1345(00)01591-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- M Hirata
- Liver Transplantation Team, Faculty of Medicine, University of Tokyo, Tokyo, Japan
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80
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Harihara Y, Sano K, Makuuchi M, Kawarasaki H, Takayama T, Kubota K, Ito M, Mizuta K, Yoshino H, Hirata M, Kita Y, Hisatomi S, Kusaka K, Miura Y, Hashizume K. Correlation between graft size and necessary tacrolimus dose after living-related liver transplantation. Transplant Proc 2000; 32:2166-7. [PMID: 11120116 DOI: 10.1016/s0041-1345(00)01618-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Y Harihara
- Liver Transplant Team, University of Tokyo, Bunkyo-ku, Tokyo, Japan
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81
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Harihara Y, Sano K, Makuuchi M, Kawarasaki H, Takayama T, Kubota K, Ito M, Mizuta K, Yoshino H, Hirata M, Kita Y, Hisatomi S, Kusaka K, Miura Y, Hashizume K. Influence of donor age on the graft function after living-related liver transplantation. Transplant Proc 2000; 32:2164-5. [PMID: 11120115 DOI: 10.1016/s0041-1345(00)01617-1] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Y Harihara
- Liver Transplant Team, University of Tokyo, Bunkyo-Ku, Tokyo, Japan
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82
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Hirata M, Harihara Y, Hisatomi S, Miura Y, Yoshino H, Mizuta K, Ito M, Sano K, Taniai N, Kusaka K, Kita Y, Kawarasaki H, Kubota K, Takayama T, Makuuchi M. A case of esophageal variceal rupture following acute portal vein thrombosis three days after living-related liver transplantation. Transplant Proc 2000; 32:2266-8. [PMID: 11120160 DOI: 10.1016/s0041-1345(00)01659-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- M Hirata
- Department of Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
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83
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Hirata M, Harihara Y, Hisatomi S, Miura Y, Yoshino H, Mizuta K, Ito M, Sano K, Taniai N, Kusaka K, Kita Y, Kawarasaki H, Kubota K, Takayama T, Hashizume K, Makuuchi M. Living-related liver transplantation for patients with primary biliary cirrhosis. Transplant Proc 2000; 32:2208-9. [PMID: 11120135 DOI: 10.1016/s0041-1345(00)01637-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- M Hirata
- Faculty of Medicine, Liver Transplantation Team, University of Tokyo, Tokyo, Japan
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84
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Harihara Y, Makuuchi M, Kawasaki S, Hashikura Y, Kawarasaki H, Takayama T, Kubota K, Ito M, Mizuta K, Yoshino H, Hirata M, Kita Y, Sano K, Hisatomi S, Kusaka K, Hashizume K. Influence of HLA compatibility on living-related liver transplantation. Transplant Proc 2000; 32:2107. [PMID: 11120089 DOI: 10.1016/s0041-1345(00)01590-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Y Harihara
- Liver Transplant Team, University of Tokyo, Tokyo, Japan
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85
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Imai Y, Mizuta K. Measurements of thermal effects on four-photon mixing conversion efficiency in an optical fiber. Opt Lett 2000; 25:1412-1414. [PMID: 18066232 DOI: 10.1364/ol.25.001412] [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] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Thermal effects on the conversion efficiency of four-photon mixing (FPM) power in a silica optical fiber are measured. When the temperature of the fiber changes from 9 to 350 degrees C, the first Stokes power decreases with a temperature coefficient of -0.33%/ degrees C as the temperature increases to 200 degrees C and then becomes saturated with a further increase in temperature. This temperature characteristic of the first Stokes power reflects the temperature characteristics of the nonlinear refractive index of the fiber, which are similar to its FPM temperature dependence.
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86
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Abstract
The present study was designed to investigate 1) whether parasympathetic reflex vasodilatation occurs in the submandibular gland (SMG) in deeply urethan-anesthetized, cervically vagotomized, and sympathectomized rats when the central cut end of the lingual nerve (LN) is electrically stimulated and 2) to what extent the neural mechanisms underlying such responses are the same as those involved in the response to direct stimulation of the chorda-LN (CLN). Stimulation of each nerve separately elicited a marked blood flow increase in SMG. Section of the chorda tympani abolished the SMG blood flow response but had no effect on the lip blood flow increase evoked by LN stimulation. Section of the CLN abolished the SMG blood flow increases evoked by stimulation of either nerve. The SMG blood flow increases (regardless of whether they were evoked by LN or CLN stimulation) were markedly reduced by the autonomic cholinergic ganglion blocker hexamethonium. The present study demonstrates that a parasympathetic reflex vasodilator mechanism is present in the rat SMG and that it can express its effects under deep general anesthesia.
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Affiliation(s)
- K Mizuta
- Departments of Orofacial Functions and Pediatric Dentistry, Tohoku University School of Dentistry, Sendai, Japan
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87
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Tsujii R, Miyoshi K, Tsuno A, Matsui Y, Toh-e A, Miyakawa T, Mizuta K. Ebp2p, yeast homologue of a human protein that interacts with Epstein-Barr virus nuclear antigen 1, is required for pre-rRNA processing and ribosomal subunit assembly. Genes Cells 2000; 5:543-53. [PMID: 10947841 DOI: 10.1046/j.1365-2443.2000.00346.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [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: 02/01/2023]
Abstract
BACKGROUND A defect in the secretory pathway causes the transcriptional repression of both rRNA and ribosomal protein genes in Saccharomyces cerevisiae, suggesting a coupling of ribosome synthesis and plasma membrane synthesis. Rrs1p, an essential nuclear protein, is required for the secretory response. RESULTS EBP2, encoding the yeast homologue of a human protein that interacts with Epstein-Barr virus Nuclear Antigen 1, was cloned in a two-hybrid screen using RRS1 as a bait. The rrs1-1 mutation, which produces Rrs1p without the C-terminal half and causes a defect in the secretory response, almost abolished the interaction with Ebp2p. Ebp2p is essential for growth and is mainly localized in the nucleolus. The effects of Ebp2p depletion on ribosome biogenesis is quite similar to that of Rrs1p depletion; in the Ebp2p-depleted cells, the rate of pre-rRNA processing is slower, and significantly less mature 25S rRNA is produced compared to those in wild-type cells. The polysome pattern indicates that Ebp2p-depletion causes a decrease of 80S monosomes and polysomes, an accumulation of 40S subunits, and the appearance of half-mer polysomes. CONCLUSIONS Ebp2p is required for the maturation of 25S rRNA and 60S subunit assembly. Ebp2p may be one of the target proteins of Rrs1p for executing the signal to regulate ribosome biogenesis.
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Affiliation(s)
- R Tsujii
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Kagamiyama 1-4-1, Higashi-Hiroshima 739-8527, Japan
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88
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Mizuta K, Furuta M, Ito Y, Sawai S, Fujigaki M, Horibe M, Miyata H. A case of Meniere's disease with vertical nystagmus after administration of glycerol. Auris Nasus Larynx 2000; 27:271-4. [PMID: 10808118 DOI: 10.1016/s0385-8146(00)00050-x] [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: 10/18/2022]
Abstract
A 62-year-old woman who complained of repetitive vertigo with a left fluctuating hearing loss was admitted to our hospital three times. A glycerol test was done on the third admission. Two hours after the administration of glycerol, the patient complained of rotatory vertigo with a downbeat vertical nystagmus. This nystagmus then changed its direction upward. Her left hearing loss was improved during the glycerol test. On the day after the glycerol test, a caloric test was done. The caloric response of the right ear was remarkably improved. Although she had not felt a hearing loss in the right ear, an overwritten audiogram showed a fluctuation of hearing in the right ear. The bilateral caloric responses fluctuated. From these findings, it appears that the function of the inner ear on both sides fluctuating. We speculate that the administration of glycerol elicited an asymmetry in the function of the inner ear on both sides and ocuured vertigo with vertical nystagmus because of the irritation of both ears.
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Affiliation(s)
- K Mizuta
- Department of Otorhinolaryngology, Gifu University School of Medicine, 40 Tsukasa-machi, Gifu, Japan
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89
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Matsuzaki Y, Mizuta K, Kimura H, Sugawara K, Tsuchiya E, Suzuki H, Hongo S, Nakamura K. Characterization of antigenically unique influenza C virus strains isolated in Yamagata and Sendai cities, Japan, during 1992-1993. J Gen Virol 2000; 81:1447-52. [PMID: 10811928 DOI: 10.1099/0022-1317-81-6-1447] [Citation(s) in RCA: 27] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Three influenza C virus strains (C/Yamagata/1/92, C/Yamagata/1/93 and C/Miyagi/5/93) isolated in Yamagata and Sendai Cities, Japan, between June 1992 and May 1993 were found to possess haemagglutinin-esterase glycoproteins that were antigenically indistinguishable from one another but were clearly different from any previous Japanese isolates. To investigate the origin of the 1992/1993 strains, their antigenic and genetic properties were compared with those of eight strains isolated outside Japan between 1967 and 1982. The results showed that the 1992/1993 isolates were closely related to a virus isolated in Brazil in 1982 (C/SaoPaulo/378/82) and that these viruses (including C/SaoPaulo/378/82) are reassortants that had obtained PB1 and NP genes from a C/Yamagata/26/81-like parent and the other genes from another as yet unidentified parent.
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Affiliation(s)
- Y Matsuzaki
- Department of Bacteriology, Yamagata University School of Medicine, Iida-Nishi, Yamagata 990-9585, Japan.
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90
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Tsuno A, Miyoshi K, Tsujii R, Miyakawa T, Mizuta K. RRS1, a conserved essential gene, encodes a novel regulatory protein required for ribosome biogenesis in Saccharomyces cerevisiae. Mol Cell Biol 2000; 20:2066-74. [PMID: 10688653 PMCID: PMC110823 DOI: 10.1128/mcb.20.6.2066-2074.2000] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A secretory defect causes specific and significant transcriptional repression of both ribosomal protein and rRNA genes (K. Mizuta and J. R. Warner, Mol. Cell. Biol. 14:2493-2502, 1994), suggesting the coupling of plasma membrane and ribosome syntheses. In order to elucidate the molecular mechanism of the signaling pathway, we isolated a cold-sensitive mutant with a mutation in a gene termed RRS1 (regulator of ribosome synthesis), which appeared to be defective in the signaling pathway. The rrs1-1 mutation greatly reduced transcriptional repression of both rRNA and ribosomal protein genes that is caused by a secretory defect. RRS1 is a novel, essential gene encoding a nuclear protein of 203 amino acid residues that is conserved in eukaryotes. A conditional rrs1-null mutant was constructed by placing RRS1 under the control of the GAL1 promoter. Rrs1p depletion caused defects in processing of pre-rRNA and assembly of ribosomal subunits.
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Affiliation(s)
- A Tsuno
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
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91
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Uchida H, Tanaka H, Kitoh Y, Yanagisawa K, To H, Tago K, Mizuta K, Fujimura A, Tominaga S, Hashizume K, Kobayashi E. Mechanisms of immunomodulation induced by blood transfusion: identification of humoral factors. Transplant Proc 2000; 32:255-6. [PMID: 10715408 DOI: 10.1016/s0041-1345(99)00948-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- H Uchida
- Department of Clinical Pharmacology, Jichi Medical School, Tochigi, Japan
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92
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Abstract
White spotting (Ws) rats possess a c-kit gene mutation at the W locus, resulting in a variety of characteristics including a lack of intermediate cells of the stria vascularis. The present study employs a light microscope (LM), scanning (SEM) and transmission electron microscopes (TEM), diaminobenzidine (DAB) staining techniques and auditory brainstem response (ABR) to investigate the structure and function of the cochlea in 26 homozygous Ws/Ws rats aged 1-6 months. A slight thinning of the stria vascularis and moderate elevation of ABR threshold were about the only defects noted in 1 month animals, while older animals displayed various defects that tended to worsen with age. At 3 months LM revealed pigment granules in the basal turn of most animals, with a loss of pigmentation in the upper turns. The stria vascularis and organ of Corti tended to be well preserved in the lower, pigmented portion, while the upper, unpigmented portion showed severe strial degeneration and some outer hair cell loss. DAB staining revealed a well developed strial capillary net throughout the pigmented portion of the cochlea, with severe degradation in the unpigmented apical portion. ABR thresholds were slightly elevated over 1 month values. At 6 months great differences in degeneration were noted between right and left ears of the same animal.
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MESH Headings
- 3,3'-Diaminobenzidine
- Animals
- Auditory Threshold
- Cochlea/pathology
- Cochlea/physiopathology
- Cochlea/ultrastructure
- Evoked Potentials, Auditory, Brain Stem
- Hair Cells, Auditory, Outer/pathology
- Hair Cells, Auditory, Outer/ultrastructure
- Heterozygote
- Homozygote
- Microscopy, Electron
- Microscopy, Electron, Scanning
- Proto-Oncogene Proteins c-kit/genetics
- Rats
- Rats, Mutant Strains
- Staining and Labeling
- Stria Vascularis/pathology
- Stria Vascularis/ultrastructure
- Time Factors
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Affiliation(s)
- T Hoshino
- Department of Otolaryngology, Hamamatsu University School of Medicine, 3600 Handa-cho, Hamamatsu, Japan.
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93
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Okamoto T, Mizuta K, Mizobuchi S, Usui A, Takahashi T, Fujimoto S, Kishi T. Decreased serum ubiquinol-10 levels in healthy subjects during exercise at maximal oxygen uptake. Biofactors 2000; 11:31-3. [PMID: 10705954 DOI: 10.1002/biof.5520110109] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- T Okamoto
- Faculty of Pharmaceutical Sciences, Kobe Gakuin University, Japan.
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94
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Mizuta K, Ohmori M, Miyashita F, Kitoh Y, Fujimura A, Mori M, Kanno T, Hashizume K, Kobayashi E. Effect of pretreatment with FTY720 and cyclosporin on ischaemia-reperfusion injury of the liver in rats. J Pharm Pharmacol 1999; 51:1423-8. [PMID: 10678498 DOI: 10.1211/0022357991777065] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
The effect of pretreatment with FTY720 (2-amino-2-[2-(4-octylphenyl)ethyl]-1,3-propanediol hydrochloride) or cyclosporin, or both, on neutrophil-mediated injury has been examined by use of a rat model of transient clamping of hepatic flow. Pretreatment with FTY720 alone or with cyclosporin induced a marked reduction of circulatory lymphocytes, whereas the use of these drugs in combination was very effective at suppressing the elevation of the number of peripheral polymorphonuclear neutrophils (PMN) after reperfusion. Pretreatment with cyclosporin, with or without FTY720, significantly reduced hepatic damage, whereas FTY720 alone tended to prolong hepatic damage. Pretreatment of cyclosporin alone, but not in combination with FTY720, significantly reduced the accumulation of PMN and led to lower myeloperoxidase levels in the damaged liver. In conclusion, pretreatment with cyclosporin, with or without FTY720, reduced hepatic damage after warm ischaemia-reperfusion, whereas pretreatment with FTY720 alone tended to prolong this damage.
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Affiliation(s)
- K Mizuta
- Department of Clinical Pharmacology, Centre for Molecular Medicine, Jichi Medical School, Kawachi-gun, Tochigi, Japan
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95
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Mizuta K, Kobayashi E, Uchida H, Fujimura A, Kawarasaki H, Hashizume K. Influence of tacrolimus on bile acid and lipid composition in continuously drained bile using a rat model. Comparative study with cyclosporine. Transpl Int 1999; 12:316-22. [PMID: 10551996 DOI: 10.1007/s001470050234] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Cholestatic effects have been reported for cyclosporine (CsA), but information is still limited for tacrolimus (TCR). The purpose of this study was to investigate the influence of TCR on biliary bile acid and lipid composition as compared with CsA, using a continuously bile-drained rat model. Adult male Wistar rats received TCR (0.4 mg/kg, 1 mg/kg, and 4 mg/kg) or CsA (2.5 mg/kg, 10 mg/kg, and 25 mg/kg) by intramuscular injection (i.m.) daily for 10 days. On day 7, the common bile duct of all rats was cannulated, then bile was continuously collected for the following 3 days. Bile flow, bile acid secretion rate (BASR), and biliary lipids secretion were measured for each of the groups. TCR increased bile acid-dependent flow (BADF) but with no statistical significance. However, this agent did not influence total bile flow and biliary lipids secretion, while bile acid-independent flow (BAIF) was significantly reduced and bile acid synthesis (mainly cholic acid, CA, synthesis) was increased. In contrast, CsA was cholestatic, showing a tendency to reduce both BADF and BAIF. BASR was dose-dependently suppressed, especially in chenodeoxycholic acid (CDCA). Furthermore, biliary lipids secretions were also significantly decreased under a higher dose of CsA. TCR increased BADF with no influence on total bile flow, having a stimulating effect on CA production, although CsA dose-dependently diminishes CDCA production and consequently reduced bile secretion. Our results suggest that TCR is a less effective agent on cholestasis as compared to CsA.
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Affiliation(s)
- K Mizuta
- Department of Clinical Pharmacology, Jichi Medical School, Minamikawachi-machi, Kawachi-gun, Tochigi 329-0498, Japan
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96
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Uchida H, Kobayashi E, Ogino Y, Mizuta K, To H, Okabe R, Hashizume K, Fujimura A. Chronopharmacology of tacrolimus in rats: toxicity and efficacy in a mouse-to-rat intestinal transplant model and its pharmacokinetic profile. Transplant Proc 1999; 31:2751-3. [PMID: 10578276 DOI: 10.1016/s0041-1345(99)00552-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H Uchida
- Division of Organ Replacement Research, Jichi Medical School, Tochigi, Japan
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97
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Uchida H, Kobayashi E, Ogino Y, Mizuta K, Hashizume K, Fujimura A. Experimental intestinal transplantation using mouse fetal intestine in the rat: combination effect of FK 506 with cyclophosphamide. Transplant Proc 1999; 31:2799-800. [PMID: 10578297 DOI: 10.1016/s0041-1345(99)00573-4] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- H Uchida
- Division of Organ Replacement Research, Jichi Medical School, Tokyo, Japan
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98
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Farcasanu IC, Hirata D, Tsuchiya E, Mizuta K, Miyakawa T. Involvement of thioredoxin peroxidase type II (Ahp1p) of Saccharomyces cerevisiae in Mn2+ homeostasis. Biosci Biotechnol Biochem 1999; 63:1871-81. [PMID: 10635552 DOI: 10.1271/bbb.63.1871] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [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
To identify new proteins involved in Mn2+ homeostasis, we isolated Mn(2+)-resistant mutants of Saccharomyces cerevisiae starting from a calcineurin-deficient, Mn2+ hypersensitive strain (delta cmp1 delta cmp2). The mutations were found to lie in the PMR1 gene, known to encode a "P-type" Ca(2+)-ATPase that transports Ca2+ and Mn2+ from the cytosol to the Golgi apparatus. A second gene, AHP1, was cloned as a suppressor of the Mn2+ tolerance of a delta cmp1 delta cmp2 pmr1 mutant. Ahp1p was recently described as a thioredoxin peroxidase type II, an antioxidant protein with alkyl hydroperoxide defense properties in yeast. AHP1 disruption in strain W303 decreased tolerance to Mn2+ and H2O2. We found that a GFP-Ahp1p fusion construct was in the cytosol when cells were grown in glucose, and in the mitochondria when cells were grown in oleate. Based on Mn2+ transport data, we concluded that Ahp1p is involved in cellular Mn2+ homeostasis in trafficking of Mn2+ from cytosol to mitochondria and from cytosol for export across the plasma membrane.
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Affiliation(s)
- I C Farcasanu
- Department of Fermentation Technology, Faculty of Engineering, Hiroshima University, Japan
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99
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Mizuta K, Hishikawa S, Yoshida T, Kobayashi E, Uchida H, Fujimura A, Kawarasaki H, Hashizume K. Survival of rats undergoing continuous bile drainage depends on maintenance of circadian rhythm of bile secretion. Chronobiol Int 1999; 16:759-65. [PMID: 10584176 DOI: 10.3109/07420529909016943] [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: 11/13/2022]
Abstract
It is very difficult to collect bile secretions from animals for extended periods of time. We compared the use of saline or water as drinking fluids to sustain the animals, which were being continuously drained of bile. Complete bile drainage was performed in 16 male Wistar rats by surgical intervention. After surgery, 8 rats were given tap water, and the other 8 were given normal saline for water. The rats that received water rapidly lost weight after bile drainage, and all died within 8 days after the operation. In contrast, all rats that drank saline maintained their body weight and survived 14 days or longer after surgery. Serum biochemistry of the rats with water intake on the third day after bile drainage revealed hyponatremia, hypochloremia, and acute renal failure resulting in hyperkalemia. In contrast, electrolyte balance and renal function were normal in the rats with saline intake, and bile was secreted continuously with a circadian rhythm. These results clearly demonstrate that saline as drinking water is essential to the replacement of lost fluids and loss of electrolytes due to bile drainage. Further, saline proved efficacious for sustaining experimental animals undergoing continuous bile collection.
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Affiliation(s)
- K Mizuta
- Department of Pediatric Surgery, Faculty of Medicine, University of Tokyo, Japan
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100
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Mizuta K, Kobayashi E, Uchida H, Ogino Y, Fujimura A, Kawarasaki H, Hashizume K. Cyclosporine inhibits transport of bile acid in rats: comparison of bile acid composition between liver and bile. Transplant Proc 1999; 31:2755-6. [PMID: 10578278 DOI: 10.1016/s0041-1345(99)00554-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- K Mizuta
- Department of Pediatric Surgery, Faculty of Medicine, University of Tokyo, Japan
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