101
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Tivey R, Ando T, Antipenkov A, Barabash V, Chiocchio S, Federici G, Ibbott C, Jakeman R, Janeschitz G, Raffray R, Akiba M, Mazul I, Pacher H, Ulrickson M, Vieider G. ITER divertor, design issues and research and development. FUSION ENGINEERING AND DESIGN 1999. [DOI: 10.1016/s0920-3796(99)00047-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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102
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Akiba M, Sameshima T, Miyazawa H, Shinagawa K, Nakazawa M. [Fecal shedding and serum antibody responses of cattle experimentally infected with enterohaemorrhagic Escherichia coli O157:H7]. KANSENSHOGAKU ZASSHI. THE JOURNAL OF THE JAPANESE ASSOCIATION FOR INFECTIOUS DISEASES 1999; 73:1082-3. [PMID: 10565127 DOI: 10.11150/kansenshogakuzasshi1970.73.1082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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103
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Akiba M, Sameshima T, Anzai T, Wada R, Nakazawa M. Salmonella Abortusequi strains of equine origin harbor a 95kb plasmid responsible for virulence in mice. Vet Microbiol 1999; 68:265-72. [PMID: 10510045 DOI: 10.1016/s0378-1135(99)00078-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Most Salmonella choleraesuis subsp. choleraesuis serovar Abortusequi strains of equine origin harbor a 95kb plasmid, pSA95. Results of PCR and Southern blot analysis suggest that pSA95 contains spv genes. A pSA95-cured strain of S. Abortusequi was 48 times less virulent to mice than its parental strain. Virulence was restored by reintroduction of pSA95. These results provide clear evidence that pSA95 confers virulence on S. Abortusequi in mice. This is the first report describing a virulence plasmid of S. Abortusequi.
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104
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Raffray A, Schlosser J, Akiba M, Araki M, Chiocchio S, Driemeyer D, Escourbiac F, Grigoriev S, Merola M, Tivey R, Vieider G, Youchison D. Critical heat flux analysis and R&D for the design of the ITER divertor. FUSION ENGINEERING AND DESIGN 1999. [DOI: 10.1016/s0920-3796(99)00053-8] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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105
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Akiba M, Sameshima T, Nakazawa M. The shift of genetic subtypes of Escherichia coli O157:H7 isolates from cattle. Epidemiol Infect 1999; 122:343-6. [PMID: 10355802 PMCID: PMC2809626 DOI: 10.1017/s0950268899002204] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
A total of 46 Escherichia coli O157:H7 isolates were obtained from sequential faecal samples from seven cattle collected over periods of 2 months. Nine closely related genetic subtypes, determined by pulsed-field gel electrophoresis types using three kinds of restriction endonuclease were observed among the isolates. Distinguishable, but closely related genetic subtypes can be isolated from one farm, or from one cow, should be considered when undertaking an epidemiological survey.
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106
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Akiba M, Masuda T, Sameshima T, Katsuda K, Nakazawa M. Molecular typing of Escherichia coli O157:H7 (H-) isolates from cattle in Japan. Epidemiol Infect 1999; 122:337-41. [PMID: 10355801 PMCID: PMC2809625 DOI: 10.1017/s0950268899002198] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
A total of 77 Escherichia coli O157:H7 (H-) isolates from cattle in Japan were investigated by molecular biological methods. Most of these isolates (43 isolates) possessed the stx-2 gene, but not stx1. Fifteen bacteriophage types and 50 pulsed-field gel electrophoresis (PFGE) profiles were observed. One isolate was indistinguishable from the human outbreak strain by these methods. This indicates that cattle must be considered as a possible source of human E. coli O157:H7 infection in Japan.
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107
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Nakazawa M, Akiba M. Swine as a potential reservoir of shiga toxin-producing Escherichia coli O157:H7 in Japan. Emerg Infect Dis 1999; 5:833-4. [PMID: 10603223 PMCID: PMC2640794 DOI: 10.3201/eid0506.990618] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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108
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Nakamura K, Suzuki S, Tanabe T, Dairaku M, Yokoyama K, Akiba M. Disruption erosions of various kinds of tungsten. FUSION ENGINEERING AND DESIGN 1998. [DOI: 10.1016/s0920-3796(98)00241-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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109
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Akiba M, Suzuki S. Overview of the Japanese mock-up tests for ITER high heat flux components. FUSION ENGINEERING AND DESIGN 1998. [DOI: 10.1016/s0920-3796(98)00107-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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110
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Katsuda K, Sameshima T, Akiba M, Nakazawa M. Characterisation of Escherichia coli O157:H7 (H-) derived from cattle using random amplification of polymorphic DNA analysis. Res Vet Sci 1998; 65:177-8. [PMID: 9839900 DOI: 10.1016/s0034-5288(98)90173-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
One hundred and two isolates of Escherichia coli O157:H7 derived from cattle were characterised by random amplification of polymorphic DNA (RAPD). Four different RAPD profiles were observed. Based on the combined results of RAPD typing and toxin genotyping, the isolates could be divided into six distinct groups.
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111
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Ise H, Satoh S, Yamazaki S, Akiba M, Nakamura K, Suzuki S, Araki M. Development of fabrication technologies for the ITER divertor. FUSION ENGINEERING AND DESIGN 1998. [DOI: 10.1016/s0920-3796(98)00257-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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112
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Oya T, Kumon H, Kobayashi H, Akiba M, Hosokawa T, Kakimoto N, Nakamura K, Morimitsu Y, Osawa T. A novel biomarker for hyperglycemia, MRX isolated from hydrolysate of glycated proteins. Biochem Biophys Res Commun 1998; 246:267-71. [PMID: 9600104 DOI: 10.1006/bbrc.1998.8595] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Long-lived proteins can undergo non-enzymatic glycation to form highly crosslinked structures with characteristic fluorescence during aging and diabetes processes. In this paper, a typical fluorophore, named Maillard reaction product X (MRX), was isolated from the hydrolysate of glycated proteins. MRX could be formed by incubation of bovine serum albumin with glucose, followed by acid hydrolysis. The structure of MRX was determined to be 8-hydroxy-5-methyldihydrothiazolo[3,2-alpha] pyridinium-3-carboxylate. MRX was also found to be formed by the incubation of cysteine and arginine with glucose, followed by hydrolysis. We found the formation of MRX in the recently developed genetically diabetic Otsuka Long-Evans Tokushima Fatty (OLETF) rats and compared them with that in the control Long-Evans Tokushima Otsuka (LETO) rats. Significantly higher levels of MRX were observed from the serum (p < 0.005) and urinary protein (p < 0.001) of OLETF rats in comparison with those of LETO rats. MRX must be a potential candidate as a biomarker for hyperglycemia.
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113
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Akiba M, Sameshima T, Nakazawa M. [Carrier state of escherichia coli O157:H7 in cattle]. KANSENSHOGAKU ZASSHI. THE JOURNAL OF THE JAPANESE ASSOCIATION FOR INFECTIOUS DISEASES 1998; 72:167-8. [PMID: 9545695 DOI: 10.11150/kansenshogakuzasshi1970.72.167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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114
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Koyama K, Imaizumi T, Akiba M, Kinoshita K, Takahashi K, Suzuki A, Yano S, Horie S, Watanabe K, Naoi Y. Antinociceptive components of Ganoderma lucidum. PLANTA MEDICA 1997; 63:224-227. [PMID: 9225603 DOI: 10.1055/s-2006-957658] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The antinociceptive effects 134 extracts prepared from 45 species of mushrooms were examined by the acetic acid-induced writhing method. From the CH2Cl2 extract of Ganoderma lucidum among the active extracts, ganoderic acids A, B, G and H and compound C6 were isolated as the antinociceptive components.
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115
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Jin HY, Akiba M, Umakoshi K, Sasaki Y, Kabuto K. Dichloro[N,N,N',N'-tetrakis(2-pyridylmethyl)ethylenediamine]samarium(III) Perchlorate. Acta Crystallogr C 1997. [DOI: 10.1107/s0108270196009924] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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116
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117
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Hino T, Akiba M. Summary of Japan-US workshop on high heat flux components and plasma surface interactions for next fusion devices. FUSION ENGINEERING AND DESIGN 1996. [DOI: 10.1016/0920-3796(95)00427-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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118
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Akiba M, Yoshida I, Suzutani T, Ogasawara M, Azuma M. Relationship of the strain and the intraocular amount of herpes simplex virus types 1 and 2 in the induction of anterior-chamber-associated immune deviation. Ophthalmic Res 1996; 28:289-95. [PMID: 8979277 DOI: 10.1159/000267917] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We investigated the induction of anterior-chamber-associated immune deviation (ACAID) by herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2). Two strains of HSV-1 (VR-3 and F) and four strains of HSV-2 (UW-268, 186, SL, and MS) were inactivated with ultraviolet light, and the anterior chamber of BALB/c mice was inoculated with a viral strain. Immunization against delayed-type hypersensitivity (DTH) was done subcutaneously on day 7 after anterior chamber inoculation. On day 10 after DTH immunization, each virus was inoculated into the foot pad. DTH was evaluated by measuring the foot pad thickness at 24 h after the inoculation into the foot pad. DTH was suppressed by anterior chamber inoculation with more than 10(3) plaque-forming units (PFU) of the VR-3, UW-268, 186, and SL strains, and with 10(5) PFU of the F strain, but not by the MS strain. Until now, HSV-2 was believed not to induce ACAID, however, our results indicate that some HSV-2 strains induce ACAID.ACAID induction by HSV-1 and HSV-2 may depend on both the viral strain and the amount of ocular viral antigen.
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119
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Nakamura K, Akiba M, Araki M, Dairaku M, Sato K, Suzuki S, Yokoyama K, Ando T, Jimbou R, Saidoh M, Fukaya K, Bolt H, Linke J. Thermal tests on B4C-overlaid carbon fibre reinforced composites under disruption heat load conditions. FUSION ENGINEERING AND DESIGN 1995. [DOI: 10.1016/0920-3796(94)00231-u] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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120
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Wakamiya H, Suzuki E, Yamamoto I, Akiba M, Arakawa N. In situ intestinal absorption of 2-O-alpha-D-glucopyranosyl-L-ascorbic acid in guinea pigs. J Nutr Sci Vitaminol (Tokyo) 1995; 41:265-72. [PMID: 7562119 DOI: 10.3177/jnsv.41.265] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The intestinal absorption efficacy of 2-O-alpha-D-glucopyranosyl-L-ascorbic acid (AA-2G), which has been recently synthesized and characterized as a stable ascorbate (AsA), was determined in guinea pigs by the perfusion technique. Perfusion of AA-2G in isotonic phosphate buffer to the small intestine resulted in a decrease of AA-2G accompanied by an increase of AsA in the perfusate. The results showed that intact AA-2G was not detected in the plasma of the portal vein of guinea pigs at 2 h after perfusion. The disappearance of AA-2G from perfusate was completely inhibited by the addition of castanospermine, a specific alpha-glucosidase inhibitor, or by carbohydrates such as maltose. These results indicate that ascorbic acid released from AA-2G by alpha-glucosidase on the brush border membrane is effectively taken up across the intestinal ascorbate transport channels, into a serosal site, whereas AA-2G permeation was poor via the passive transport system.
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121
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Linke J, Akiba M, Araki M, Bolt H, Breitbach G, Duwe R, Nakamura K, You J. Evaluation of cooling concepts and specimen geometries for high heat flux tests on neutron irradiated divertor elements. FUSION ENGINEERING AND DESIGN 1995. [DOI: 10.1016/0920-3796(95)90023-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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122
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Yoshida I, Akiba M, Hoq MM, Azuma M. Formation of anti-sense RNA to IFN mRNA in poly (rI):(rC) induced HEL cells. [HOKKAIDO IGAKU ZASSHI] THE HOKKAIDO JOURNAL OF MEDICAL SCIENCE 1994; 69:1365-71. [PMID: 7535729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
To elucidate the mechanism of super induction of IFN, mRNA and anti-sense RNA were analyzed by using reverse transcription-polymerase chain reaction (RT-PCR) method, and following results were obtained. (1) When human embryonic lung fibroblast cells (HEL cells) were exposed to poly (rI):(rC) for 1 hr, treated with cycloheximide for 3 hr, treated with actinomycin-D for 30 min at the final period of cycloheximide treatment, then washed and replenished with maintenance medium, (HEL-I:C/CH/Act. D), they produced much higher amount of IFN and IFN production continued for longer period when compared to the HEL cells which were not treated with actinomycin-D (HEL-I:C/CH). In agreement with these IFN production kinetics, HuIFN-beta mRNA was stabilized in HEL-I:C/CH/Act. D. In HEL-I:C/CH/Act.D, the mRNA was detected at the end of cloheximide treatment (4 hr after induction) and 6 hr after induction, however, it was not detected at 6 hr after induction in HEL-I:C/CH. (2) Anti-sense RNA was detected in HEL-I:C/CH/Act.D at 4 hr and 6 hr after induction, and also in HEL-I:C/CH at 4 hr after induction, however, it was not detected at 6 hr after induction in HEL-I:C/CH. These results indicated that an anti-sense RNA to HuIFN-beta mRNA was formed in poly (rI):(rC) induced HEL cells, and that aRNA had the same fate as mRNA, suggesting it's role in the regulation of IFN production. Possible role of aRNA in the regulation mechanism of IFN production was discussed.
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123
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Yoshimura Y, Iwashita M, Karube M, Oda T, Akiba M, Shiokawa S, Ando M, Yoshinaga A, Nakamura Y. Growth hormone stimulates follicular development by stimulating ovarian production of insulin-like growth factor-I. Endocrinology 1994; 135:887-94. [PMID: 8070383 DOI: 10.1210/endo.135.3.8070383] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The present study was undertaken to investigate the effects of GH on follicular growth, oocyte maturation, ovulation, and production of insulin-like growth factor-I (IGF-I) in the in vitro perfused rabbit ovaries. Ovulation did not occur in any ovaries perfused with GH at a concentration of 1, 10, 100, or 200 ng/ml, but the addition of GH to the perfusate increased the follicle diameter in a dose-dependent manner. The production of IGF-I by ovaries perfused with medium alone was very low throughout the perfusion period. The addition of 100 ng/ml GH to the perfusate significantly increased ovarian production of IGF-I at 4, 6, 8, and 12 h compared with the contralateral control ovaries. Changes in the tissue concentrations of IGF-I in ovaries perfused with 100 ng/ml GH paralleled those triggered by exposure to 50 IU human CG (hCG). When the effect of GH on the tissue concentration of IGF-I was determined at 4 h, GH stimulated the tissue concentration of IGF-I in perfused rabbit ovaries in a dose-dependent manner. The percent increase in follicle diameter in ovaries treated with GH was significantly correlated with the intraovarian IGF-I content. The mean number of ovulations per ovary and the ovulatory efficiency were significantly reduced in ovaries perfused with 5 IU hCG, compared with those in ovaries perfused with 50 IU hCG. The addition of 100 ng/ml GH to the perfusate significantly increased the ovulatory efficiency and follicle diameter in the 5 IU hCG-treated ovaries. Exposure to GH significantly stimulated the resumption of meiosis in the follicular oocytes compared with that in ovaries perfused with medium alone. Furthermore, GH significantly stimulated the resumption of meiosis in ovulated ova and follicular oocytes in ovaries treated with 5 IU hCG. Thus, exposure to GH-stimulated follicular growth, oocyte maturation, and production of IGF-I in the in vitro perfused rabbit ovaries, which indicates that the ovary is in fact a site of GH reception and action. Additionally, GH enhanced the effects of gonadotropins, acting synergistically to promote the ovulatory process. These observations suggest that GH may amplify gonadotropin actions in the process of follicular development and ovulation, at least in part, by stimulating ovarian IGF-I production.
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Yoshimura Y, Jinno M, Oda T, Shiokawa S, Yoshinaga A, Hanyu I, Akiba M, Nakamura Y. Prolactin inhibits ovulation by reducing ovarian plasmin generation. Biol Reprod 1994; 50:1223-30. [PMID: 8080910 DOI: 10.1095/biolreprod50.6.1223] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The present study was undertaken to investigate the effects of prolactin (PRL) on gonadotropin-induced ovulation and the biosynthesis of prostaglandin (PG), leukotriene (LT), and plasmin in in vitro perfused rabbit ovaries. The addition of PRL to the perfusate inhibited hCG-induced ovulation in vitro in a dose-dependent manner. Although exposure to hCG significantly increased PGF2 alpha, PGE2, and LTB4 production by perfused rabbit ovaries, PRL did not affect the secretion rates of PGs and LTB4 stimulated by hCG administration. The ovarian plasmin generation was determined by measuring the amount of plasmin bound to its major inhibitor, alpha 2-plasmin inhibitor (alpha 2PI-Plm). Exposure to hCG enhanced biphasically the ovarian secretion rate of alpha 2 PI-Plm, while PRL at a dose of 10(3) ng/ml significantly inhibited the hCG-stimulated generation of alpha 2 PI-Plm in ovaries throughout the entire perfusion period. A significant correlation was observed between ovulatory efficiency and ovarian plasmin generation in the PRL-treated ovaries. Additionally, PRL inhibited intrafollicular concentrations of alpha 2 PI-Plm in hCG-treated ovaries in a dose-dependent manner. These observations substantiate an essential role for a plasma-generating system in the cascade of events leading to ovulation. In conclusion, PRL may act directly on the ovary and block ovulation, at least in part, via the inhibition of ovarian plasmin generation.
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125
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Yoshimura Y, Koyama N, Karube M, Oda T, Akiba M, Yoshinaga A, Shiokawa S, Jinno M, Nakamura Y. Gonadotropin stimulates ovarian renin-angiotensin system in the rabbit. J Clin Invest 1994; 93:180-7. [PMID: 8282785 PMCID: PMC293751 DOI: 10.1172/jci116943] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The present study was undertaken to assess the role of ovarian renin-angiotensin system (RAS) in the preovulatory cascade induced by gonadotropin exposure. In the in vitro perfused rabbit ovaries, exposure to human chorionic gonadotropin (hCG) enhanced the secretion rate of angiotensin II (Ang II) within 1 h. The secretion rate reached maximal levels at 6 h and then declined thereafter. The intrafollicular Ang II content and renin-like activity were also significantly increased at 2 and 4 h after exposure to hCG, compared with control ovaries perfused with medium alone. The level of intrafollicular Ang II after hCG exposure significantly exceeded the concentration of Ang II in an equivalent volume of plasma. The addition of 1 microM captopril to the perfusate significantly inhibited the secretion rate of Ang II stimulated by hCG; however, captopril affected neither the ovulatory efficiency nor prostaglandin production in ovaries treated with hCG. Captopril significantly inhibited the resumption of meiosis in the ovulated ova and follicular oocytes stimulated by hCG. The administration of 100 micrograms Ang II at 2-h intervals to the perfusate reversed the inhibitory effects of captopril on hCG-induced oocyte maturation. In conclusion, these data indicate that gonadotropin stimulates renin-like activity and Ang II production in the rabbit ovary. Ovarian renin-angiotensin system may play an important role in the process of oocyte maturation after exposure to gonadotropin.
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Yoshimura Y, Karube M, Oda T, Koyama N, Shiokawa S, Akiba M, Yoshinaga A, Nakamura Y. Locally produced angiotensin II induces ovulation by stimulating prostaglandin production in in vitro perfused rabbit ovaries. Endocrinology 1993; 133:1609-16. [PMID: 8404601 DOI: 10.1210/endo.133.4.8404601] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The present study was undertaken to investigate the role of exogenous and endogenous angiotensin II (Ang II) in ovarian steroidogenesis and production of prostaglandin (PG) in in vitro perfused rabbit ovaries. The addition of 100 or 10 micrograms Ang II at 2-h intervals to the perfusate did not stimulate progesterone production, but significantly stimulated estradiol (E2) production by perfused rabbit ovaries. When the specific antagonist of Ang II, saralasin at 2 x 10(-6) M, was added to the perfusate 30 min before the onset of Ang II administration, Ang II-stimulated production of E2 was significantly blocked. Ang II also significantly stimulated both PGE2 and PGF2 alpha production, while the addition of saralasin to the perfusate significantly inhibited the Ang II-stimulated production of PG. The levels of PGs in ovaries perfused with saralasin plus 100 micrograms Ang II did not differ significantly from those in control ovaries perfused with medium alone. Exposure to human CG (hCG) significantly stimulated production of progesterone and E2 by perfused rabbit ovaries, while the concomitant administration of 2 x 10(-6) M saralasin significantly reduced only E2 production. Addition of saralasin to the perfusate inhibited hCG-stimulated PG production in a dose-dependent manner. The ovulatory efficiency in ovaries treated with hCG alone or hCG plus saralasin was significantly correlated with PG production by perfused rabbit ovaries at 12 h after exposure to hCG. The production of PG stimulated by Ang II was completely reduced by indomethacin treatment during the entire perfusion period. Indomethacin completely blocked Ang II-induced ovulation, but not Ang II-stimulated oocyte maturation. Concurrent administration of staurosporine, a protein kinase C inhibitor, at 10(-6) M significantly inhibited Ang II-stimulated meiotic maturation of ovulated ova and follicular oocytes. In conclusion, these results indicate that Ang II has a direct role in ovarian production of E2 and PG. An intrinsic renin-angiotensin system in the rabbit ovary may act as an intermediary of gonadotropin-stimulated PG production. Locally produced Ang II may induce ovulation in the rabbit ovary, at least in part, by stimulating PG production.
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Oikawa T, Ogura N, Akiba M, Abiko Y, Takiguchi H, Izumi H. Stimulation of plasmin activity in cultured human fibroblast cells by Porphyromonas endodontalis. THE INTERNATIONAL JOURNAL OF BIOCHEMISTRY 1993; 25:1227-31. [PMID: 8224366 DOI: 10.1016/0020-711x(93)90071-l] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
1. Plasmin activity in the conditioned medium of Gin-1 cells, a human gingival fibroblast cell line, was stimulated by Porphyromonas endodontalis, a putative pathogen of oral submucous abscesses, in a time- and dose-dependent manner. 2. P. endodontalis stimulated the activity of plasminogen activator in both the conditioned medium and the cell lysate. The plasminogen activator in Gin-1 cells was approx. 50 kDa by zymography. 3. The conditioned medium of Gin-1 cells exposed to P. endodontalis stimulated the conversion of human serum prekallikrein to kallikrein. 4. These results suggested that P. endodontalis stimulates the plasminogen activator-plasmin system in Gin-1 cells, and that activated plasmin plays a role in the progress of periodontal tissue inflammation.
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Nakamura Y, Yoshimura Y, Oda T, Shiokawa S, Yoshinaga A, Akiba M. Comparative study of hormonal dynamics in pregnant and nonpregnant cycles during pulsatile subcutaneous administration of human menopausal gonadotropin in anovulatory infertile women. Fertil Steril 1993; 60:254-61. [PMID: 8339820 DOI: 10.1016/s0015-0282(16)56093-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
OBJECTIVE To assess the clinical relevance of daily hormonal changes for achieving a successful pregnancy in anovulatory infertile women. DESIGN A comparative study of hormonal dynamics in pregnant and nonpregnant cycles during the pulsatile subcutaneous administration of hMG. Subjects received subcutaneous injection of either 9.375 IU or 14.0625 IU of hMG diluted in 50-microL physiological saline (total daily dose, 150 or 225 IU) at 90-minute intervals by means of a portable peristaltic pump. SETTING Kyorin University Hospital and Ichikawa General Hospital. PATIENTS We analyzed 18 pregnant and 42 nonpregnant cycles in 17 patients with secondary hypothalamic/pituitary amenorrhea who conceived after receiving pulsatile hMG treatment. Another 14 women with normal spontaneous ovulation, including 14 pregnant and 15 nonpregnant cycles, served as controls. MEASUREMENTS Serum concentrations of LH, FSH, E2, and P were measured, and the P:E2 ratio was determined. RESULTS Serum concentrations of LH and FSH did not differ significantly between the pregnant and nonpregnant cycles. Serum levels of P and E2 were significantly higher during the hMG treatments than those of the spontaneous ovulatory cycles throughout the follicular and luteal phases. Up to the midluteal phase, the P and E2 values in the nonpregnant cycles during the hMG treatments did not differ significantly from those in the pregnant cycles. The P:E2 ratios were comparable between the pulsatile stimulatory cycles and the normal spontaneous ovulatory cycles. However, the P:E2 ratio in the early and midluteal phases was significantly greater in the pregnant cycles than in the nonpregnant cycles. CONCLUSION The P:E2 ratio in the early and midluteal phases is a more important indicator of hormonal function for implantation than the absolute levels of either P or E2.
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Shiokawa S, Yoshimura Y, Yoshinaga A, Akiba M, Nakamura Y. [Expression of cell surface extracellular matrix receptor in early human decidua]. NIHON SANKA FUJINKA GAKKAI ZASSHI 1993; 45:673-4. [PMID: 8393469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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130
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Araki M, Akiba M, Sugihara M, Suzuki S, Nishio S, Yokoyama K. Analytical and experimental evaluations of simulated sweeping heat load on the divertor plate for ITER. FUSION ENGINEERING AND DESIGN 1993. [DOI: 10.1016/0920-3796(93)90116-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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131
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Nagata M, Tanioka H, Mibu H, Hikida M, Akiba M, Yamamoto I. Effect of ascorbic acid 2-0-alpha-glucoside on hydrocortisone-induced cataract formation in developing chick embryos: I. Comparison of the preventive effect of ascorbic acid derivatives. JOURNAL OF OCULAR PHARMACOLOGY 1993; 9:59-68. [PMID: 8463733 DOI: 10.1089/jop.1993.9.59] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The effect of ascorbic acid 2-O-alpha-glucoside (AA-2G) on hydrocortisone (HC)-induced lens opacity in developing chick embryo was examined and compared with those of ascorbic acid (AsA) and ascorbic acid 2-phosphate (AA-2P). The opacity was dose-dependently inhibited by a single administration of 10 or 20 mumol/egg of AA-2G and by three repeated administrations of 1, 3 or 10 mumol/egg of AA-2G. AA-2G was the most effective among the three compounds. Glucose did not enhance the preventive effect of AsA against HC-induced opacity, and neither dehydro ascorbic acid nor glucose also prevented HC-induced cataract. In the histological study, we observed many small vacuoles in the nuclear region of the opaque lens treated with HC. AA-2G inhibited the formation of such vacuoles, an effect closely correlated with the prevention of cataract formation.
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Wakamiya H, Suzuki E, Yamamoto I, Akiba M, Otsuka M, Arakawa N. Vitamin C activity of 2-O-alpha-D-glucopyranosyl-L-ascorbic acid in guinea pigs. J Nutr Sci Vitaminol (Tokyo) 1992; 38:235-45. [PMID: 1453234 DOI: 10.3177/jnsv.38.235] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The vitamin C activity of 2-O-alpha-D-glucopyranosyl-L-ascorbic acid (AA-2G), which is one of chemically stable derivatives of L-ascorbic acid (AsA), in guinea pigs was investigated. Male guinea pigs were divided into 9 groups and fed AsA-deficient diet for 24 days with the following supplement: AA-2G- or AsA-supplemented groups were orally supplemented with 0.96, 1.92, 9.6 and 192 AA-2G mg/animal/day or equimolar amounts of AsA (0.5, 1, 5 and 100 mg/animal/day, respectively); AsA-deficient group received neither of them. The body weight gain, serum alkaline phosphatase activity, and the concentration of AsA and AA-2G in the liver, adrenals and urine of the guinea pigs were measured at the end of the experimental period. The AA-2G-supplemented guinea pigs showed similar body weight gain to the animals supplemented with equimolar amount of AsA. Serum alkaline phosphatase activity in both AA-2G- and AsA-supplemented groups was significantly higher than that of AsA-deficient group. But there was no significant difference between the groups supplemented with AA-2G and the equimolar amount of AsA. AA-2G-supplemented guinea pigs showed no apparent symptoms of scurvy. In AA-2G-supplemented groups, AA-2G was not detected in the liver, adrenals and urine, but AsA was found and the AsA concentration increased with increasing AA-2G dosage. The AsA concentration in the tissues of each AA-2G-supplemented groups was higher than that of AsA-deficient group, which was similar to that of the groups supplemented with equimolar amount of AsA. These results showed that AA-2G has the same vitamin C activity as AsA on a molar basis for the orally supplemented guinea pigs.
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van der Laan J, Akiba M, Hassanein A, Seki M, Tanchuk V. Prediction for disruption erosion of ITER plasma facing components; a comparison of experimental and numerical results. FUSION ENGINEERING AND DESIGN 1991. [DOI: 10.1016/0920-3796(91)90119-b] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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134
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Vieider G, Cardella A, Akiba M, Matera R, Watson R. ITER plasma facing components, design and development. FUSION ENGINEERING AND DESIGN 1991. [DOI: 10.1016/0920-3796(91)90180-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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135
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Ioki K, Yamada M, Sakata S, Okada K, Toyoda M, Shimizu K, Tsujimura S, Iimura M, Akiba M, Araki M, Seki M. Development of conductively cooled first wall armor and actively cooled divertor structure for ITER/FER. FUSION ENGINEERING AND DESIGN 1991. [DOI: 10.1016/0920-3796(91)90200-a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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136
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Akiba M, Takatsu H, Kuroda T, Hashizume H, Araki M, Dairaku M, Ise H, Suzuki S, Tanaka S, Yokoyama K, Seki M. Development of plasma facing components at JAERI. FUSION ENGINEERING AND DESIGN 1991. [DOI: 10.1016/0920-3796(91)90114-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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137
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Akiba M, Bolt H, Watson R, Kneringer G, Linke J. The development of divertor and first wall armour parts at JAERI, Sandia N.L. and KFA Jülich. FUSION ENGINEERING AND DESIGN 1991. [DOI: 10.1016/0920-3796(91)90187-u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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138
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Tanaka S, Ohara Y, Akiba M, Araki M, Hanada M, Inoue T, Mizuno M, Okumura Y, Seki M, Watanabe K, Uede T, Yamashita Y, Ozaki A, Saitoh Y. Maintenance of neutral beam injectors for ITER (Japanese proposal). FUSION ENGINEERING AND DESIGN 1991. [DOI: 10.1016/0920-3796(91)90170-u] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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139
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Oku T, Akiba M, Lee MH, Moon SJ, Hosoya N. Metabolic fate of ingested [14C]-maltitol in man. J Nutr Sci Vitaminol (Tokyo) 1991; 37:529-44. [PMID: 1802977 DOI: 10.3177/jnsv.37.529] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Six healthy male subjects were given a single oral dose of 0.4 g of maltitol per kg body weight containing [U-14C]-maltitol (50 microCi) and their breath, urine, feces and blood were collected at appropriate intervals for 48 h to measure the recovery of administered radioactivity. Further, to measure breath hydrogen, 15 healthy male subjects ingested 30 g of maltitol and samples of their breath were collected for a 10-h period. The expired 14CO2 showed a wide peak about 3 h after ingestion and 56% of the administered radioactivity was recovered in 48 h. An additional 0.2% of administered radioactivity was recovered as expired 14CH4, 2.6% in urine and 14.3% in feces, respectively. The obvious increase of breath hydrogen was detected at 1 h after maltitol ingestion and then a big peak at 3.5 h, whereas maltose ingestion did not increase breath hydrogen. Both excretion profiles of breath 14CO2 and hydrogen coincided well. These results demonstrate that a greater part of ingested maltitol is fermented by intestinal microbes than is hydrolyzed by digestive enzymes. Although maltitol is catabolized to carbon dioxide via intestinal microbes, the available energy is much lower than that of digestible sugars such as sucrose.
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Muto N, Ban Y, Akiba M, Yamamoto I. Evidence for the in vivo formation of ascorbic acid 2-O-alpha-glucoside in guinea pigs and rats. Biochem Pharmacol 1991; 42:625-31. [PMID: 1859466 DOI: 10.1016/0006-2952(91)90326-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
In vivo formation of ascorbic acid 2-O-alpha-glucoside (AA-2G) in guinea pigs and rats given ascorbic acid (AA) orally in combination with maltose was examined. A metabolite of AA which has the same HPLC retention characteristics as authentic AA-2G was detected in the blood, urine and liver of guinea pigs 1-2 hr after their administration. The metabolite was isolated from the urine by chromatographic procedures and identified as AA-2G by its UV spectrum, non-reducibility, susceptibility to alpha-glucosidase hydrolysis, HPLC profile and elementary analysis. The same glucoside was also synthesized by rats and found in the urine, although it could not be determined qualitatively in the blood. AA-2G-forming activities of tissue homogenates from both animals were apparently correlated with their alpha-glucosidase activities and, moreover, both activities were completely inhibited by a specific neutral alpha-glucosidase inhibitor. Thus, we conclude that AA-2G is a possible metabolite produced by enzymatic alpha-glucosidation after a combined administration of AA and maltose to guinea pigs and rats.
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141
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Akiba M, Saeki H, Ishii T, Yamamoto S, Ueda K. Immunological changes in Babesia rodhaini infected BALB/c mice after treated with anti-babesial drug; diminazene diaceturate. J Vet Med Sci 1991; 53:371-7. [PMID: 1832024 DOI: 10.1292/jvms.53.371] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A model system capable of investigating immunological changes was first established in Babesia rodhaini infected mice with an aid of a drug, diminazene diaceturate (DD). Intraperitoneal (ip) inoculation with B. rodhaini resulted in acute death in euthymic (nu/+) and athymic (nu/nu) BALB/c mice. Treatment with DD at an early stage of infection saved both mice from acute death. Parasitemia recurred in some of them but resulted in death only in nu/nu mice. A re-challenge with 10(5) parasitized erythrocytes (PE) on the surviving mice on day 28 post infection revealed resistance in nu/+ but not in nu/nu mice. The results suggested a participation of the thymus in the protective mechanisms. Immunological changes were then observed on nu/+ and nu/nu mice which were inoculated ip with 10(4)PE and treated with the drug, and then challenged with 10(5)PE ip on day 28. An antibody response was measured with immediate reaction by footpad injection of a soluble antigen of B. rodhaini and by ELISA of serum antibody using the antigen and protein A, on day 10 and later, and further a pronounced response was detected after re-challenge in nu/+ mice. No response was detected by ELISA in nu/nu mice. Delayed footpad reaction was seen in nu/+ mice by day 14 and later but it was suppressed after the re-challenge.(ABSTRACT TRUNCATED AT 250 WORDS)
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Akiba M, Kodama T, Ito Y, Obara T, Fujimoto Y. Hypoglycemia induced by excessive rebound secretion of insulin after removal of pheochromocytoma. World J Surg 1990; 14:317-24. [PMID: 2195784 DOI: 10.1007/bf01658514] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
During an 8-year-period from 1981, a total of 6 of 45 patients with pheochromocytoma developed severe hypoglycemia (plasma glucose, 12-50 mg/dl) 2-4 1/2 hours after removal of the tumor. In order to elucidate the pathogenesis of the hypoglycemic attack, the levels of plasma immunoreactive insulin (IRI) and glucose were sequentially measured at surgery in 10 patients with pheochromocytoma, from the beginning of the operation until usually 5 hours after tumor resection. The same examinations were carried out in 4 patients with primary aldosteronism and 1 patient with Cushing's syndrome as controls. The highest plasma IRI levels observed in the 2 patients with postexcisional hypoglycemia were 174 and 2,081 microU/ml and those in the 8 patients without hypoglycemia were 13-222 microU/ml (mean, 77), but they were only 14-33 microU/ml (mean, 22) in the 5 control patients. The mean of the highest plasma IRI/glucose ratios in the immediate postoperative phase was 1.37 +/- 0.87 in the 10 patients with pheochromocytoma but only 0.16 +/- 0.04 in the 5 control patients (p less than 0.01). Review of the clinical data in our series disclosed that patients with higher levels of preoperative urinary epinephrine excretion and those with either diabetes mellitus or impaired glucose tolerance tended to develop postoperative hypoglycemia. These observations suggest that endogenous insulin secretion is suppressed by increase plasma catecholamines, and that excessive rebound secretion of insulin after removal of a pheochromocytoma is a rather common phenomenon. Intravenous infusion of glucose is necessary and plasma glucose levels should be monitored after resection of a pheochromocytoma.
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Akiba M, Kunieda Y, Maeda S, Oita M, Okabe M, Maekawa I, Miyazaki T. [Tumor lysis syndrome at the induction therapy of the first remission in two cases of T-ALL]. [RINSHO KETSUEKI] THE JAPANESE JOURNAL OF CLINICAL HEMATOLOGY 1990; 31:198-203. [PMID: 2184270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The anti-tumor therapy followed by tumor lysis syndrome may cause the metabolic disorders including hyperkalemia, hyperphosphatemia and hyperuricemia. It should be known that it occurs frequently in lymphoproliferative diseases, especially in Burkitt's lymphoma. Two cases of T-ALL accompanied by this syndrome, from which the patients were recovered, at the induction therapy of the first complete remission are reported here. Case 1. A 28-year-old man received VP therapy under the diagnosis of T-ALL with massive hepatosplenomegaly and bilateral enlarged kidneys. During the therapy, metabolic disorders with both renal failure and ventricular tachycardia happened. They were resolved by certain series of treatments. The patient was brought to a complete remission with normal size of liver, spleen and kidneys. Case 2. A boy aged 15 having received the intrasubarachnoidal infusion of MTX and 1-Ad-VP therapy under the diagnosis of T-ALL accompanied by this syndrome which was improved by an appropriate treatment, and the patient was lead to the remission. The risk factors of this syndrome, such as 1-high drug sensitivity of the tumor; 2-renal dysfunction; 3-rapid cytokinetics of the tumor cell; 4-bigger size of the tumor, as well as the preventive treatment of this syndrome are reviewed.
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Shigemi A, Akiba M. [Nursing of an asthmatic child showing an accentuated tendency towards dependency on others]. [KANGO GIJUTSU] : [NURSING TECHNIQUE] 1989; 35:1238-41. [PMID: 2630709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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145
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Hirano T, Oka K, Akiba M. Antiproliferative effects of synthetic and naturally occurring flavonoids on tumor cells of the human breast carcinoma cell line, ZR-75-1. RESEARCH COMMUNICATIONS IN CHEMICAL PATHOLOGY AND PHARMACOLOGY 1989; 64:69-78. [PMID: 2749004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
An examination was made of the effects of 21 synthetic and naturally occurring flavonoids on the in vitro growth of cells of the human breast carcinoma, ZR-75-1. In all cases, antiproliferative effects were noted, with an IC50 ranging from 2.7 to 33.5 micrograms/ml, except for the isoflavonoid, daidzin (IC50 greater than 50 micrograms/ml). No significant structure-activity relationship among the compounds could be found. Flavone, 6-hydroxyflavone and 4',5,7-trihydroxyflavone (apigenin) were the most potent with IC50 of 2.7, 3.4, and 3.5 micrograms/ml, respectively. The flavonoid effects observed here were not due to cytostatic action alone, since cell death was found to increase dose-dependently, according to the results of a dye exclusion test.
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Hirano T, Oka K, Akiba M. Effects of synthetic and naturally occurring flavonoids on Na+,K+-ATPase: aspects of the structure-activity relationship and action mechanism. Life Sci 1989; 45:1111-7. [PMID: 2552245 DOI: 10.1016/0024-3205(89)90168-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A comparative study was made of the effects of 15 synthetic and naturally occurring flavonoids on the hydrolytic activity of Na+, K+-adenosine triphosphatase (ATPase). Twelve of the flavonoids examined were mono-hydroxy or mono-methoxy derivatives. All inhibited Na+, K+-ATPase from dog kidney cortex when present at concentrations from 40-1000 microM. Flavones possessing cyclohexyl instead of the phenyl group (i.e., 2-cyclohexyl-benzopyran-4-one derivatives), were the most potent with IC50 at 257-320 microM. Structure-activity relationships were observed among the following mono-substituted flavones as: i) 2-cyclohexyl-benzopyran-4-one much greater than 2-phenyl-benzopyran-4-one; ii) 2-cyclohexyl-7-hydroxybenzopyran-4-one greater than 2-cyclohexyl-6-hydroxybenzopyran-4-one greater than 2-cyclohexyl-5-hydroxybenzopyran-4-one. Some flavonoids showing potent inhibitory activity were also examined for ouabain-displacement activity on human erythrocytes. Hardly any of the flavonoids were able to block [3H]ouabain binding to erythrocytes. These results suggest that the mechanism by which flavonoid block Na+, K+-ATPase is not related to the cardiac glycoside-specific binding site(s) of this enzyme.
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Hirano T, Oka K, Kawashima E, Akiba M. Effects of synthetic and naturally occurring flavonoids on mitogen-induced proliferation of human peripheral-blood lymphocytes. Life Sci 1989; 45:1407-11. [PMID: 2796610 DOI: 10.1016/0024-3205(89)90028-3] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Examination was made of the effects of 17 synthetic and naturally occurring flavonoids on human lymphocyte proliferation in the presence of concanavalin A as a mitogen. Twelve of the flavonoids examined were mono-hydroxy or methoxy derivatives. The mitogen-induced response of lymphocytes was evaluated from the extent of the incorporation of [3H]thymidine into cells in vitro. All the compounds showed inhibitory effects; 4.5-77.7% of [3H]thymidine incorporation was blocked by an 1.0 micrograms/ml concentration. The viability of lymphocytes before and after treatment, as assessed by a dye exclusion test, indicated no change, and thus the flavonoids may inhibit DNA synthesis. The flavonoids possessing 5-hydroxyl, 5-methoxyl and 6-methoxyl groups, and those with cyclohexyl instead of phenyl substituent (i.e. 2-cyclohexyl-benzopyran-4-one), showed the greatest inhibition. The inhibitory effect of any one of them was less than one half that of prednisolone, but essentially the same or somewhat exceeding that of bredinine or azathioprine. It would thus appear that the well-known anti-inflammatory effects of flavonoids may possibly arise in part from the inhibition of the proliferative response of lymphocytes.
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Akiba M, Akiba K, Kageura T, Suzuki T, Okada E, Hayashi T, Kawabe K, Sato M, Kawana T, Yamaguchi F. [Treatment of the condylar fracture of mandible by surgical method]. NICHIDAI KOKU KAGAKU = NIHON UNIVERSITY JOURNAL OF ORAL SCIENCE 1988; 14:337-49. [PMID: 3253590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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149
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Yashiro T, Ito K, Akiba M, Kanaji Y, Obara T, Fujimoto Y, Hirayama A, Nakajima H. Papillary carcinoma of the thyroid arising from dyshormonogenetic goiter. ENDOCRINOLOGIA JAPONICA 1987; 34:955-64. [PMID: 3450511 DOI: 10.1507/endocrj1954.34.955] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A case of thyroid papillary carcinoma associated with dyshormonogenetic goiter is reported. The patient, a 35-year-old male, has been on thyroid hormone therapy since the age of three because of familial dyshormonogenetic goiter. He developed a distinct tumor in the right lobe, which was suggestive of carcinoma upon physical as well as ultrasonographic examination. Total thyroidectomy was performed, since a frozen section disclosed a focus of papillary carcinoma and the possibility of future development of further malignancy in any remaining thyroid tissue was considered. The patient is currently well with complete thyroid hormone supplementation one and a half years after the operation.
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Matsuda S, Akiba M, Araki M, Dairaku M, Ebisawa N, Horiike H, Itoh T, Kanai T, Kawai M, Komata M, Kuriyama M, Kitamura S, Matsuoka M, Mizuhashi K, Ohga T, Ohhara H, Ohuchi Y, Ohara Y, Okumura Y, Shibanuma K, Shibata T, Shirakata H, Sugawara T, Tanaka S, Watanabe K. The JT-60 neutral beam injection system. FUSION ENGINEERING AND DESIGN 1987. [DOI: 10.1016/s0920-3796(87)90580-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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