1
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Niizeki H, Tanaka R, Nomura T, Seki A, Miyasaka M, Matsumoto Y, Ishibashi M, Narumi S, Nakabayashi K, Yoshida K. Lack of cutis verticis gyrata is associated with c.1279_1290del12 of SLCO2A1 in 43 Japanese patients with pachydermoperiostosis. J Dermatol Sci 2024:S0923-1811(24)00054-9. [PMID: 38644096 DOI: 10.1016/j.jdermsci.2024.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 02/22/2024] [Accepted: 03/21/2024] [Indexed: 04/23/2024]
Affiliation(s)
- H Niizeki
- Division of Dermatology, National Center for Child Health and Development, Tokyo, Japan.
| | - R Tanaka
- Division of Dermatology, National Center for Child Health and Development, Tokyo, Japan
| | - T Nomura
- Department of Dermatology, Graduate School of Medicine and Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - A Seki
- Division of Orthopedics, National Center for Child Health and Development, Tokyo, Japan
| | - M Miyasaka
- Division of Radiology, National Center for Child Health and Development, Tokyo, Japan
| | - Y Matsumoto
- Division of Dermatology, National Center for Child Health and Development, Tokyo, Japan
| | - M Ishibashi
- Department of Dermatology, Graduate School of Medicine and Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - S Narumi
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - K Nakabayashi
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - K Yoshida
- Division of Dermatology, National Center for Child Health and Development, Tokyo, Japan.
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2
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Shiiya C, Aoki S, Nakabayashi K, Hata K, Amagai M, Kubo A. Linear and disseminated porokeratosis in one family showing identical and independent second hits in MVD among skin lesions, respectively: a proof-of-concept study. Br J Dermatol 2021; 184:1209-1212. [PMID: 33481264 DOI: 10.1111/bjd.19824] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 01/17/2021] [Accepted: 01/18/2021] [Indexed: 12/24/2022]
Affiliation(s)
- C Shiiya
- Department of Dermatology, Keio University School of Medicine, Tokyo, Japan
| | - S Aoki
- Department of Dermatology, Keio University School of Medicine, Tokyo, Japan
| | - K Nakabayashi
- Department of Maternal-Fetal Biology, National Centre for Child Health and Development, Tokyo, Japan
| | - K Hata
- Department of Maternal-Fetal Biology, National Centre for Child Health and Development, Tokyo, Japan
| | - M Amagai
- Department of Dermatology, Keio University School of Medicine, Tokyo, Japan
| | - A Kubo
- Department of Dermatology, Keio University School of Medicine, Tokyo, Japan
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3
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Fujita H, Sasaki T, Miyamoto T, Mori T, Nakabayashi K, Hata K, Matsuura S, Matsubara Y, Amagai M, Kubo A. 733 Identification and molecular characterization of a CDC20 mutation in a novel mosaic variegated aneuploidy syndrome with premature aging phenotypes. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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4
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Okuno M, Ayabe T, Yokota I, Musha I, Shiga K, Kikuchi T, Kikuchi N, Ohtake A, Nakamura A, Nakabayashi K, Okamura K, Momozawa Y, Kubo M, Suzuki J, Urakami T, Kawamura T, Amemiya S, Ogata T, Sugihara S, Fukami M. Protein-altering variants of PTPN2 in childhood-onset Type 1A diabetes. Diabet Med 2018; 35:376-380. [PMID: 29247561 DOI: 10.1111/dme.13566] [Citation(s) in RCA: 4] [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] [Accepted: 12/12/2017] [Indexed: 12/31/2022]
Abstract
AIM To examine the contribution of PTPN2 coding variants to the risk of childhood-onset Type 1A diabetes. METHODS PTPN2 mutation analysis was carried out for 169 unrelated Japanese people with childhood-onset Type 1A diabetes. We searched for coding variants that were absent or extremely rare in the general population and were scored as damaging by multiple in silico programs. We performed mRNA analysis and three-dimensional structural prediction of the detected variants, when possible. We also examined possible physical links between these variants and previously reported risk SNPs as well as clinical information from variant-positive children. RESULTS One frameshift variant (p.Q286Yfs*24) and two probably damaging missense substitutions (p.C232W and p.R350Q) were identified in one child each. Of these, p.Q286Yfs*24 and p.C232W were hitherto unreported, while p.R350Q accounted for 2/121,122 alleles of the exome datasets. The p.Q286Yfs*24 variant did not encode stable mRNA, and p.C232W appeared to affect the structure of the tyrosine-protein phosphatase domain. The three variants were physically unrelated to known risk SNPs. The variant-positive children manifested Type 1A diabetes without additional clinical features and invariably carried risk human leukocyte antigen alleles. CONCLUSIONS The results provide the first indication that PTPN2 variants contribute to the risk of Type 1A diabetes, independently of known risk SNPs. PTPN2 coding variants possibly induce non-specific Type 1A diabetes phenotypes in individuals with human leukocyte antigen-mediated disease susceptibility. Our findings warrant further validation.
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Affiliation(s)
- M Okuno
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo
- Department of Paediatrics and Child Health, Nihon University School of Medicine, Tokyo
| | - T Ayabe
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo
| | - I Yokota
- Department of Paediatrics, Division of Paediatric Endocrinology and Metabolism, Shikoku Medical Centre for Children and Adults, Kagawa
| | - I Musha
- Department of Paediatrics, Saitama Medical University, Faculty of Medicine, Saitama
| | - K Shiga
- Department of Paediatrics, Children's Medical Centre, Yokohama City University Medical Centre, Yokohama
| | - T Kikuchi
- Department of Paediatrics, Saitama Medical University, Faculty of Medicine, Saitama
| | - N Kikuchi
- Department of Paediatrics, Yokohama City Minato Red Cross Hospital, Yokohama
| | - A Ohtake
- Department of Paediatrics, Saitama Medical University, Faculty of Medicine, Saitama
| | - A Nakamura
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo
| | - K Nakabayashi
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo
| | - K Okamura
- Systems BioMedicine, National Research Institute for Child Health and Development, Tokyo
| | - Y Momozawa
- Laboratory for Genotyping Development, Riken Centre for Integrative Medical Sciences, Kanagawa
| | - M Kubo
- Laboratory for Genotyping Development, Riken Centre for Integrative Medical Sciences, Kanagawa
| | - J Suzuki
- Department of Paediatrics and Child Health, Nihon University School of Medicine, Tokyo
| | - T Urakami
- Department of Paediatrics and Child Health, Nihon University School of Medicine, Tokyo
| | - T Kawamura
- Department of Paediatrics, Osaka City University School of Medicine, Osaka
| | - S Amemiya
- Department of Paediatrics, Saitama Medical University, Faculty of Medicine, Saitama
| | - T Ogata
- Department of Paediatrics, Hamamatsu University School of Medicine, Hamamatsu
| | - S Sugihara
- Department of Paediatrics, Tokyo Women's Medical University Medical Centre East, Tokyo, Japan
| | - M Fukami
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo
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5
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Nakamura S, Miyado M, Saito K, Katsumi M, Nakamura A, Kobori Y, Tanaka Y, Ishikawa H, Yoshida A, Okada H, Hata K, Nakabayashi K, Okamura K, Ogata H, Matsubara Y, Ogata T, Nakai H, Fukami M. Next-generation sequencing for patients with non-obstructive azoospermia: implications for significant roles of monogenic/oligogenic mutations. Andrology 2018; 5:824-831. [PMID: 28718531 DOI: 10.1111/andr.12378] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 03/29/2017] [Accepted: 04/09/2017] [Indexed: 11/29/2022]
Abstract
Azoospermia affects up to 1% of adult men. Non-obstructive azoospermia is a multifactorial disorder whose molecular basis remains largely unknown. To date, mutations in several genes and multiple submicroscopic copy-number variations (CNVs) have been identified in patients with non-obstructive azoospermia. The aim of this study was to clarify the contribution of nucleotide substitutions in known causative genes and submicroscopic CNVs in the genome to the development of non-obstructive azoospermia. To this end, we conducted sequence analysis of 25 known disease-associated genes using next-generation sequencing and genome-wide copy-number analysis using array-based comparative genomic hybridization. We studied 40 Japanese patients with idiopathic non-obstructive azoospermia. Functional significance of molecular alterations was assessed by in silico analyses. As a result, we identified four putative pathogenic mutations, four rare polymorphisms possibly associated with disease risk, and four probable neutral variants in 10 patients. These sequence alterations included a heterozygous splice site mutation in SOHLH1 and a hemizygous missense substitution in TEX11, which have been reported as causes of non-obstructive azoospermia. Copy-number analysis detected five X chromosomal or autosomal CNVs of unknown clinical significance, in addition to one known pathogenic Y chromosomal microduplication. Five patients carried multiple molecular alterations. The results indicate that monogenic and oligogenic mutations, including those in SOHLH1 and TEX11, account for more than 10% of cases of idiopathic non-obstructive azoospermia. Furthermore, this study suggests possible contributions of substitutions in various genes as well as submicroscopic CNVs on the X chromosome and autosomes to non-obstructive azoospermia, which require further validation.
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Affiliation(s)
- S Nakamura
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan.,Department of Pediatric Urology, Jichi Medical University, Children's Medical Center Tochigi, Tochigi, Japan
| | - M Miyado
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - K Saito
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan.,Department of Comprehensive Reproductive Medicine, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - M Katsumi
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan.,Department of NCCHD Child Health and Development, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - A Nakamura
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - Y Kobori
- Department of Urology, Dokkyo Medical University Koshigaya Hospital, Koshigaya, Japan
| | - Y Tanaka
- Department of Pediatrics, Tokyo Dental College Ichikawa General Hospital, Ichikawa, Japan
| | - H Ishikawa
- Reproduction Center, Tokyo Dental College Ichikawa General Hospital, Ichikawa, Japan
| | - A Yoshida
- Reproduction Center, Kiba Park Clinic, Tokyo, Japan
| | - H Okada
- Department of Urology, Dokkyo Medical University Koshigaya Hospital, Koshigaya, Japan
| | - K Hata
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - K Nakabayashi
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - K Okamura
- Department of Systems BioMedicine, National Research Institute for Child Health and Development, Tokyo, Japan
| | - H Ogata
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - Y Matsubara
- National Research Institute for Child Health and Development, Tokyo, Japan
| | - T Ogata
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan.,Department of Pediatrics, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - H Nakai
- Department of Pediatric Urology, Jichi Medical University, Children's Medical Center Tochigi, Tochigi, Japan
| | - M Fukami
- Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo, Japan
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6
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Lewis J, Caldara A, Strong N, Wahl J, Mattheyses A, Amagai M, Sasaki T, Nakabayashi K, Hata K, Matsubara Y, Kubo A, Stahley S, Kowalczyk A. 544 A mutation in the desmoglein 1 transmembrane domain abrogates lipid raft targeting and causes severe dermatitis, multiple allergies, and metabolic wasting (SAM) syndrome. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Miyamoto Y, Nasu T, Ozaki N, Umeta Y, Tokoro H, Nakabayashi K, Ohkoshi S. Photo-induced magnetization and first-principles calculations of a two-dimensional cyanide-bridged Co–W bimetal assembly. Dalton Trans 2016; 45:19249-19256. [DOI: 10.1039/c6dt03793c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
First-principles calculations show the optical transition from WIV to CoIII, which causes photo-induced magnetization of a Co–W bimetal assembly.
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Affiliation(s)
- Y. Miyamoto
- Department of Chemistry
- School of Science
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - T. Nasu
- Department of Chemistry
- School of Science
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - N. Ozaki
- Department of Chemistry
- School of Science
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - Y. Umeta
- Department of Chemistry
- School of Science
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - H. Tokoro
- Department of Chemistry
- School of Science
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - K. Nakabayashi
- Department of Chemistry
- School of Science
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - S. Ohkoshi
- Department of Chemistry
- School of Science
- The University of Tokyo
- Tokyo 113-0033
- Japan
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Ishikawa K, Nagasawa T, Nakabayashi K, Fukui H, Shimada H. An influence of hemodialysis upon electrocardiographic waveforms. Adv Cardiol 2015; 21:210-3. [PMID: 619541 DOI: 10.1159/000400451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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9
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Nakabayashi K, Hirata T, Oka T. Left atrium compression due to oesophageal dilation can induce acute heart failure. Case Reports 2015; 2015:bcr-2014-209233. [DOI: 10.1136/bcr-2014-209233] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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10
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Kon M, Suzuki E, Dung V, Hasegawa Y, Mitsui T, Muroya K, Ueoka K, Igarashi N, Nagasaki K, Oto Y, Hamajima T, Yoshino K, Igarashi M, Kato-Fukui Y, Nakabayashi K, Hayashi K, Hata K, Matsubara Y, Moriya K, Ogata T, Nonomura K, Fukami M. Molecular basis of non-syndromic hypospadias: systematic mutation screening and genome-wide copy-number analysis of 62 patients. Hum Reprod 2015; 30:499-506. [DOI: 10.1093/humrep/deu364] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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11
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Akaishi R, Yamada T, Nakabayashi K, Nishihara H, Furuta I, Kojima T, Morikawa M, Yamada T, Fujita N, Minakami H. Autophagy in the placenta of women with hypertensive disorders in pregnancy. Placenta 2014; 35:974-80. [DOI: 10.1016/j.placenta.2014.10.009] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 10/16/2014] [Accepted: 10/18/2014] [Indexed: 01/26/2023]
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12
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Niizeki H, Shiohama A, Sasaki T, Seki A, Kabashima K, Otsuka A, Kosaki K, Ogo A, Yamada T, Miyasaka M, Matsuoka K, Hirakiyama A, Okuyama T, Matsuda M, Nakabayashi K, Tanese K, Ishiko A, Amagai M, Kudoh J. The complete type of pachydermoperiostosis: a novel nonsense mutation p.E141* of the SLCO2A1 gene. J Dermatol Sci 2014; 75:193-5. [PMID: 24929850 DOI: 10.1016/j.jdermsci.2014.05.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 05/02/2014] [Accepted: 05/23/2014] [Indexed: 10/25/2022]
Affiliation(s)
- H Niizeki
- Department of Dermatology, National Center for Child Health and Development, 2-10-1 Okura, Setagaya-ku, Tokyo 157-8535, Japan.
| | - A Shiohama
- Department of Dermatology, Keio University School of Medicine, Tokyo, Japan; Laboratory of Gene Medicine, Keio University School of Medicine, Tokyo, Japan
| | - T Sasaki
- Center for Integrated Medical Research, Keio University School of Medicine, Tokyo, Japan
| | - A Seki
- Department of Orthopedics, National Center for Child Health and Development, Tokyo, Japan
| | - K Kabashima
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - A Otsuka
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - K Kosaki
- Department of Orthopedic Surgery, University of Tokyo, Tokyo, Japan
| | - A Ogo
- Department of Metabolism and Endocrinology, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, Fukuoka, Japan
| | - T Yamada
- Department of Dermatology, Himeji Red Cross Hospital, Hyogo, Japan
| | - M Miyasaka
- Department of Radiology, National Center for Child Health and Development, Tokyo, Japan
| | - K Matsuoka
- Department of Pathology, National Center for Child Health and Development, Tokyo, Japan
| | - A Hirakiyama
- Department of Laboratory Medicine, National Center for Child Health and Development, Tokyo, Japan
| | - T Okuyama
- Department of Laboratory Medicine, National Center for Child Health and Development, Tokyo, Japan
| | - M Matsuda
- Department of Dermatology, National Center for Child Health and Development, Tokyo, Japan
| | - K Nakabayashi
- Department of Reproductive Biology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - K Tanese
- Department of Dermatology, Keio University School of Medicine, Tokyo, Japan
| | - A Ishiko
- Department of Dermatology, School of Medicine, Toho University, Ota-ku, Tokyo, Japan
| | - M Amagai
- Department of Dermatology, Keio University School of Medicine, Tokyo, Japan
| | - J Kudoh
- Laboratory of Gene Medicine, Keio University School of Medicine, Tokyo, Japan
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Nakabayashi K, Yanagi H, Atobe M. Preparation of W/O nanoemulsion using tandem acoustic emulsification and its novel utilization as a medium for phase-transfer catalytic reaction. RSC Adv 2014. [DOI: 10.1039/c4ra09452b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We have successfully demonstrated that W/O nanoemulsion prepared by the tandem acoustic emulsification is extremely useful medium for enhancing the rate of phase-transfer catalytic reactions.
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Affiliation(s)
- K. Nakabayashi
- Department of Environment and System Sciences
- Yokohama National University
- Yokohama 240-8501, Japan
| | - H. Yanagi
- Department of Electronic Chemistry
- Tokyo Institute of Technology
- Yokohama 226-8502, Japan
| | - M. Atobe
- Department of Environment and System Sciences
- Yokohama National University
- Yokohama 240-8501, Japan
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14
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Yoshida K, Nishimura H, Miyawaki D, Muraoka O, Harada A, Sulaiman N, Nakabayashi K, Yoshida S, Sasaki R, Sugimura K. 8020 POSTER Radiotherapy for Elderly Patients With Cervical Cancer. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)72108-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Yamazawa K, Nakabayashi K, Kagami M, Sato T, Saitoh S, Horikawa R, Hizuka N, Ogata T. Parthenogenetic chimaerism/mosaicism with a Silver-Russell syndrome-like phenotype. J Med Genet 2010; 47:782-5. [PMID: 20685670 PMCID: PMC2976035 DOI: 10.1136/jmg.2010.079343] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Introduction We report a 34-year-old Japanese female with a Silver-Russell syndrome (SRS)-like phenotype and a mosaic Turner syndrome karyotype (45,X/46,XX). Methods/Results Molecular studies including methylation analysis of 17 differentially methylated regions (DMRs) on the autosomes and the XIST-DMR on the X chromosome and genome-wide microsatellite analysis for 96 autosomal loci and 30 X chromosomal loci revealed that the 46,XX cell lineage was accompanied by maternal uniparental isodisomy for all chromosomes (upid(AC)mat), whereas the 45,X cell lineage was associated with biparentally derived autosomes and a maternally derived X chromosome. The frequency of the 46,XX upid(AC)mat cells was calculated as 84% in leukocytes, 56% in salivary cells, and 18% in buccal epithelial cells. Discussion The results imply that a parthenogenetic activation took place around the time of fertilisation of a sperm missing a sex chromosome, resulting in the generation of the upid(AC)mat 46,XX cell lineage by endoreplication of one blastomere containing a female pronucleus and the 45,X cell lineage by union of male and female pronuclei. It is likely that the extent of overall (epi)genetic aberrations exceeded the threshold level for the development of SRS phenotype, but not for the occurrence of other imprinting disorders or recessive Mendelian disorders.
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Affiliation(s)
- K Yamazawa
- Department of Endocrinology and Metabolism, National Research Institute for Child Health and Development, 2-10-1 Ohkura, Setagaya, Tokyo 157-8535, Japan
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16
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Yata A, Nakabayashi K, Wakahashi S, Maruo N, Ohara N, Maruo T. Suppression of progesterone production by stresscopin/urocortin 3 in cultured human granulosa-lutein cells. Hum Reprod 2009; 24:1748-53. [DOI: 10.1093/humrep/dep063] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Nakabayashi K, Makino S, Minagawa S, Smith AC, Bamforth JS, Stanier P, Preece M, Parker-Katiraee L, Paton T, Oshimura M, Mill P, Yoshikawa Y, Hui CC, Monk D, Moore GE, Scherer SW. Genomic imprinting of PPP1R9A encoding neurabin I in skeletal muscle and extra-embryonic tissues. J Med Genet 2004; 41:601-8. [PMID: 15286155 PMCID: PMC1735868 DOI: 10.1136/jmg.2003.014142] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
MESH Headings
- Alleles
- Animals
- Cell Line, Tumor
- Crosses, Genetic
- DNA Methylation
- DNA, Neoplasm/genetics
- Embryo, Mammalian/chemistry
- Embryo, Mammalian/metabolism
- Female
- Fetus/chemistry
- Fetus/metabolism
- Gene Expression Regulation, Developmental/genetics
- Genomic Imprinting/genetics
- Humans
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Inbred Strains
- Microfilament Proteins/genetics
- Muscle, Skeletal/chemistry
- Muscle, Skeletal/metabolism
- Nerve Tissue Proteins/genetics
- Protein Isoforms/genetics
- T-Lymphocytes/chemistry
- T-Lymphocytes/metabolism
- T-Lymphocytes/pathology
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18
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Kojima T, Miyachi S, Negoro M, Nakabayashi K, Fukui K, Takahashi I, Sahara Y, Suzuki O, Hattori K, Kobayashi N, Hattori K, Nakai K, Yoshida J. Coil retrieval following embolization of cerebral aneurysms. Interv Neuroradiol 2003; 9:149-55. [PMID: 20591245 DOI: 10.1177/15910199030090s121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2003] [Accepted: 02/06/2003] [Indexed: 11/15/2022] Open
Abstract
SUMMARY Failed coil embolization of cerebral aneurysms may be occasionally followed by direct surgical treatment. We had 5 patients who underwent coil retrieval and surgical clipping after coil embolization because of periprocedural complications. The patients, ranging in age from 40 to 71, had wide-neck aneurysms located at the anterior communicating artery (AcomA) in 3 patients, the middle cerebral artery (MCA) in 1, and the internal carotidophthalmic artery (IC-Ophthalmic) in 1. They were embolized with Guglielmi detachable coils (GDCs), which had to be retrieved within 8 days because of coil protrusion and migration in 3 patients, aneurysm rupture in 1, and increased mass effect due to coil compaction in 1. Coils were successfully removed with aneurysmotomy or arteriotomy under temporary trapping, aneurysms were then clipped or trapped. Three patients had a good outcome, but one suffered permanent visual disturbance and the other had a motor deficit. Our study revealed that a small AcomA aneurysm had a high risk of complication in a case of complex anatomy of the AcomA-A1-A2 complex with its difficult access. In addition, insufficient packing of the inflow zone in a large and symptomatic aneurysm may cause coil compaction and regrow with increasing mass effect. The indication and treatment strategy for these aneurysms should be carefully determined.
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Affiliation(s)
- T Kojima
- Department of Neurosurgery, Nagoya University School of Medicine, Nagoya; Japan
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19
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Miyachi S, Negoro M, Sahara Y, Suzuki O, Hattori K, Kobayashi N, Kojima T, Handa T, Nakabayashi K, Takahashi I, Fukui K, Iwakoshi T, Hattori T, Okamoto T, Yoshida J. Treatment Strategy for Cerebral Aneurysms Based on the Evidence of the Efficacy of GDC Embolization. Interv Neuroradiol 2003; 9:51-5. [PMID: 20591230 DOI: 10.1177/15910199030090s106] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2003] [Accepted: 02/06/2003] [Indexed: 11/16/2022] Open
Abstract
SUMMARY The authors reviewed 531 patients with cerebral aneurysms treated with Guglielmi detachable coils (GDCs) over 5 years to clarify both the advantages and disadvantages of embolization based on the evidence of complications by aneurysm profile. There were 52 technical complications, 25 of which resulted in unfavorable patient outcomes. Intraoperative rupture, the most serious complication exacerbating the patient's condition, occurred in 19 patients, 4 of whom expired. All of these aneurysms were very small and were mostly located in the AcomA and PICA portions. Thirteen patients encountered thromboembolic complications, 6 of whom were elderly with acute ruptured aneurysms at MCA and the tip of BA. For large or giant aneurysms manifesting the mass effect, particularly those in the ICA-C2 portion compressing the optic nerve, the saccular packing did little to ameliorate the symptoms, and subsequent surgical or endovascular trapping was needed. Therefore, saccular embolization of endovascularly difficult, very small AcomA aneurysms and large C2 aneurysm with visual symptoms should be used sparingly based on a risk-benefit assessment.
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Affiliation(s)
- S Miyachi
- Division of Endovascular Neurosurgery, Department of Neursosurgery, Study Group of Endovascualr Neurosurgery, Nagoya University Graduate School of Medicine; JShowa-ku, Nagoya; Japan -
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20
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Bentley L, Nakabayashi K, Monk D, Beechey C, Peters J, Birjandi Z, Khayat FE, Patel M, Preece MA, Stanier P, Scherer SW, Moore GE. The imprinted region on human chromosome 7q32 extends to the carboxypeptidase A gene cluster: an imprinted candidate for Silver-Russell syndrome. J Med Genet 2003; 40:249-56. [PMID: 12676894 PMCID: PMC1735416 DOI: 10.1136/jmg.40.4.249] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Imprinted gene(s) on human chromosome 7q32-qter have been postulated to be involved in intrauterine growth restriction associated with Silver-Russell syndrome (SRS) as 7-10% of patients have mUPD(7). Three imprinted genes, MEST, MESTIT1, and COPG2IT1 on chromosome 7q32, are unlikely to cause SRS since epigenetic and sequence mutation analyses have not shown any changes. One hundred kilobases proximal to MEST lies a group of four carboxypeptidase A (CPA) genes. Since most imprinted genes are found in clusters, this study focuses on analysing these CPAs for imprinting effects based on their proximity to an established imprinted domain. Firstly, a replication timing study across 7q32 showed that an extensive genomic region including the CPAs, MEST, MESTIT1, and COPG2IT1 replicates asynchronously. Subsequently, SNP analysis by sequencing RT-PCR products of CPA1, CPA2, CPA4, and CPA5 indicated preferential expression of CPA4. Pyrosequencing was used as a quantitative approach, which confirmed predominantly preferential expression of the maternal allele and biallelic expression in brain. CPA5 expression levels were too low to allow reliable evaluation of allelic expression, while CPA1 and CPA2 both showed biallelic expression. CPA4 was the only gene from this family in which an imprinting effect was shown despite the location of this family of genes next to an imprinted cluster. As CPA4 has a potential role in cell proliferation and differentiation, two preferentially expressed copies in mUPD patients with SRS syndrome would result in excess expression and could alter the growth profiles of these subjects and give rise to intrauterine growth restriction.
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Affiliation(s)
- L Bentley
- Department of Fetal and Maternal Medicine, Institute of Reproductive and Developmental Biology, Faculty of Medicine, Imperial College, London, UK.
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21
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Hirayanagi K, Nakabayashi K, Okonogi K, Ohiwa H. Autonomic nervous activity and stress hormones induced by hyperbaric saturation diving. Undersea Hyperb Med 2003; 30:47-55. [PMID: 12841608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This study describes the changes in autonomic nervous activity and stress hormones during a hyperbaric saturation dive up to 4.1 MPa in six subjects. Their autonomic nervous activity was assessed by a power spectrum analysis of heart rate variability (HRV). The levels of plasma epinephrine (E) and norepinephrine (NE), and those of salivary chromogranin A and cortisol, were compared with the pre-dive control levels. Restrained activity of the cardiac vagal nerve was recognized in the early post-dive period by a decrease in high frequency power and by the standard deviation of the HRV. By contrast, enhanced activity of sympathetic nerve was recognized in the early post-dive period by an elevated plasma E, and also in the late 3.1 MPa, 4.1 MPa, and post-dive periods by elevated plasma NE. The levels of plasma E and NE were the most sensitive indicators of sympathetic nervous activity. A joint utilization of HRV parameters with stress hormones may be an effective means of estimating the adaptive responses between hyperbaric and normobaric environments.
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Affiliation(s)
- K Hirayanagi
- Department of Hygiene and Space Medicine, Nihon University School of Medicine, Itabashi-ku, Tokyo 173-8610, Japan
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22
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Abstract
A 35-year-old woman who had been suffering from ascites more than 3 months after the delivery of her first baby, developed generalized edema, pyrexia, pleural effusion, and right lower abdominal pain. The laboratory data revealed 5.6 g of 24-hour urinary protein, increased ESR and CRP, a positive skin test for tuberculosis, and a positive culture fortuberculous bacilli from pleural effusion. A renal biopsy showed mild proliferative glomerulonephritis, IgA and C3 depositions along the capillary loop, in the mesangium and also in the focal tubular basement membrane, and scattered membranolysis of the glomerular basement membrane in addition to paramesangial and intramembranous electron-dense deposits. A positive culture of tuberculous bacilli led anti-tuberculous drugs resulted in the complete disappearance of proteinuria, inflammation, and various organ manifestations. As far as we know, the association of tuberculosis with glomerulonephritis is an uncommon occurrence. In addition to describing this case, we also discussed the role of tuberculosis in the pathogenesis of glomerulonephritis, and reviewed the pertinent literature.
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Affiliation(s)
- N Matsuzawa
- First Department of Internal Medicine, Kyorin University School of Medicine, Tokyo, Japan
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23
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Nakayama M, Iwasaki S, Hayashi M, Nakabayashi K, Satoh O, Yamamoto S, Ichinose H. [Efficacy of bispectral index for anesthetic management of combined off-pump coronary artery bypass grafting and abdominal aortic aneurysm replacement]. Masui 2001; 50:1342-4. [PMID: 11797363] [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: 02/23/2023]
Abstract
A 57-year-old female patient underwent combined off-pump coronary artery bypass grafting and abdominal aortic aneurysm replacement. Anesthesia was maintained with propofol, fentanyl, and thoracic epidural anesthesia. Propofol doses were adjusted to maintain bispectral index (BIS) between 40-60. Despite the remarkable hemodynamic changes, BIS remained stable at about 50 during the surgery. The average dose of propofol was 3.3 mg.kg-1.hr-1. The patient awoke an hour after the surgery and was extubated 1.5 hours thereafter. This case report suggests that BIS is a useful index to determine the depth of anesthesia during surgeries which induce marked hemodynamic changes.
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Affiliation(s)
- M Nakayama
- Division of Anesthesia, Obihiro Kosei Hospital, Obihiro 080-0016
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24
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Nakayama M, Ichinose H, Yamamoto S, Satoh O, Nakabayashi K, Hayashi M, Iwasaki S, Namiki A. [The effect of lidocaine on the bispectral index during anesthesia induction with propofol]. Masui 2001; 50:1213-6. [PMID: 11758326] [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: 02/23/2023]
Abstract
We investigated the effect of premixing lidocaine with propofol on a bispectral index (BIS) during propofol infusion. We studied 40 adult patients given mixture of 1% propofol 20 ml with 2 ml of normal saline (control group) or 2% lidocaine (lidocaine group) infused at 2 ml.kg-1.hr-1 for 10 minutes. Heart rate, mean arterial pressure, and BIS were measured every minute. The addition of lidocaine to propofol reduced the incidence of injection pain from 85% to 10% but did not change the induction time. Propofol significantly decreased mean arterial pressure and BIS but there was no difference between the groups. In conclusion, premixing lidocaine with propofol reduces injection pain without affecting the hypnotic effect.
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Affiliation(s)
- M Nakayama
- Division of Anesthesia, Obihiro Kosei Hospital, Obihiro 080-0016
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25
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Cheung J, Petek E, Nakabayashi K, Tsui LC, Vincent JB, Scherer SW. Identification of the human cortactin-binding protein-2 gene from the autism candidate region at 7q31. Genomics 2001; 78:7-11. [PMID: 11707066 DOI: 10.1006/geno.2001.6651] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Human chromosome 7q31 contains putative susceptibility loci for autism (AUTS1) and speech and language disorder (SPCH1). We report here the identification and characterization of a novel gene encoding cortactin-binding protein-2 (CORTBP2), which is located 45 kb telomeric to the cystic fibrosis transmembrane conductance regulator gene (CFTR) at 7q31.3. The full-length (5975-bp) gene was isolated and found to be composed of 23 exons encompassing 170 kb of DNA. In addition to being a positional candidate for AUTS1, CORTBP2 was expressed at highest levels in the brain, as shown by northern blot analysis. Subsequent mutation analysis of CORTBP2 in 90 autistic patients identified two polymorphisms, including a leucine to valine change caused by a T to G substitution in exon 15. However, comparison of allele frequencies between autistic and control populations (n=96) showed no significant difference, suggesting that this variant is not a susceptibility factor for autism.
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MESH Headings
- Amino Acid Sequence
- Autistic Disorder/genetics
- Blotting, Northern
- Carrier Proteins/genetics
- Chromosomes, Human, Pair 7/genetics
- DNA Mutational Analysis
- DNA, Complementary/chemistry
- DNA, Complementary/genetics
- Female
- Gene Expression
- Gene Frequency
- Genetic Predisposition to Disease
- Genotype
- Humans
- Membrane Transport Proteins
- Molecular Sequence Data
- Nerve Tissue Proteins/genetics
- Point Mutation
- Polymorphism, Genetic
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Sequence Alignment
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Tissue Distribution
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Affiliation(s)
- J Cheung
- Department of Genetics, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, M5G 1X8, Canada
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26
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Kanamaru K, Nagashima A, Fujiwara M, Shimada H, Shirano Y, Nakabayashi K, Shibata D, Tanaka K, Takahashi H. An Arabidopsis sigma factor (SIG2)-dependent expression of plastid-encoded tRNAs in chloroplasts. Plant Cell Physiol 2001; 42:1034-43. [PMID: 11673617 DOI: 10.1093/pcp/pce155] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
A eubacteria-type RNA polymerase (PEP) plays crucial roles for chloroplast development in higher plants. The core subunits are encoded on plastid DNA (rpo genes) while the regulatory sigma factors are encoded on the nuclear DNA (SIG genes). However, the definite gene specificity of each sigma factor is unknown. We recently identified an Arabidopsis recessive pale-green mutant abc1 in which T-DNA is inserted in SIG2 (sigB). In this mutant, almost normal etioplasts were developed under dark conditions while the small chloroplasts with poor thylakoid membranes and stacked lamellar were developed under light conditions. The sig2-1 mutant was deficient in accumulating enough photosynthetic and photosynthesis-related proteins as well as chlorophyll. However, mRNAs of their structural genes were not significantly reduced. Further analyses revealed that several plastid-encoded tRNAs including trnE-UUC that has dual function for protein and ALA biosyntheses were drastically reduced in the sig2-1 mutant. In contrast, nucleus-encoded T7 phage-type RNA polymerase (NEP)-dependent gene transcripts were steadily accumulated in the mutant. These results indicate that progress of chloroplast development requires SIG2-dependent expression of plastid genes, particularly some of the tRNA genes.
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Affiliation(s)
- K Kanamaru
- Laboratory of Molecular Genetics, Department of Molecular Biology, Institute of Molecular and Cellular Biosciences, The University of Tokyo, Tokyo, 113-0032 Japan
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27
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Fujii Y, Arimura Y, Waku M, Fujii A, Nakabayashi K, Nagasawa T. [A case of IgA nephropathy associated with silicosis]. Nihon Jinzo Gakkai Shi 2001; 43:613-8. [PMID: 11725560] [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: 02/22/2023]
Abstract
A 51-year-old male who had been working as a building wrecker for 20 years, was admitted to our hospital in June 1999 for proteinuria and hematuria examination. He started this work in 1978. Twelve years later, severe coughing and bloody sputum began and he was diagnosed as having silicosis in 1995. Urinalysis on admission showed proteinuria(294 mg/day), microhematuria(20-30/hpf), RBC cast and granular cast. High serum IgA(770 mg/dl) and high serum interleukin-6(IL-6) (3,280 pg/dl) were found. A renal biopsy showed mild mesangial matrix expansion and mesangial cell proliferation with IgA deposition, which was diagnosed as IgA nephropathy. Chest X-rays showed multiple small nodular lesions on both lung fields indicating silicosis. In Nov. 1999, he resigned from his job as a building wrecker because of increasing coughing and bloody sputum associated with body weight loss. Within 3 months after stopping this work, coughing and bloody sputum disappeared and the abnormal urinalysis findings returned to normal. Serum IgA and serum IL-6 data improved to 462 mg/dl and 2.5 pg/dl, respectively. It is suggested that silicon exposure might be related to the pathogenesis of IgA nephropathy in this patient.
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Affiliation(s)
- Y Fujii
- First Department of Internal Medicine, School of Medicine, Kyorin University, Tokyo, Japan
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28
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Kobayashi S, Yano T, Ebitsuka T, Yshida M, Nakabayashi K, Matsumoto Y, Hashimoto H. [Basic epidemiological features, treatment and prognosis of angiitis syndrome]. Nihon Naika Gakkai Zasshi 2001; 90:1708-12. [PMID: 11681047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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29
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Arimura Y, Marumo T, Fujii A, Nakabayashi K, Nagasawa T. [Anti-neutrophil cytoplasmic antibody--enzyme immunosorbent assay]. Rinsho Byori 2001; 49:571-4. [PMID: 11452543] [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: 02/20/2023]
Abstract
Enzyme immunosorbent assay(ELISA) is a very useful method to determine anti-neutrophil cytoplasmic antibody(ANCA), which is an important serological marker for pauci-immune type systemic vasculitis and necrotizing glomerulonephritis. A test was made using new myeloperoxidase(MPO)-ANCA ELISA(A), employing native MPO purified from the neutrophils in sputum as a liquid phase antigen. Furthermore, the ELISA(B) using MPO, composed of one large and one small subunit, was tested as solid phase antigen. The intra-assay and inter-assay CV of the new ELISA(A) were 3.92 to 6.75% and 5.0 to 8.1%, respectively. Close ANCA titer correlation was shown between the new MPO-ANCA ELISA(A) and the conventional ELISA, using native MPO from peripheral neutrophils as solid phase antigen. ELISA(B) showed low MPO-ANCA detection sensitivity compared to ELISA(A) and to conventional ELISA. ELISA using native MPO from neutrophils in sputum as liquid phase antigen is useful for MPO-ANCA detection. There might be an ANCA which recognizes only native form MPO.
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Affiliation(s)
- Y Arimura
- First Department of Internal Medicine, Kyorin University, School of Medicine, Mitaka 181-8614
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30
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Fukui K, Negoro M, Takahashi I, Fukasaku K, Nakabayashi K, Yoshida J. Usefulness of intravascular Doppler flow measurements in cerebral endovascular treatment. A comparison with trans cranial Doppler. Interv Neuroradiol 2001; 2:103-10. [PMID: 20682123 DOI: 10.1177/159101999600200203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/1996] [Accepted: 05/02/1996] [Indexed: 11/15/2022] Open
Abstract
SUMMARY Measurement of cerebral blood flow in cerebral endovascular procedures is useful for the assessment of treatment effects. We used transcranial Doppler sonography (TCD) and Doppler guide wires (SmartWire((R)), Cardiometries Co.) in intravascular treatment. The cases were 6 brain arteriovenous malformations (AVM), 2 carotid cavernous fistulas (CCF), 2 facial angiomas, and 2 carotid stenoses. Intravascular cerebral blood flow measurements with the SmartWire were performed during the endovascular procedure. TCD was used pre- and post-endovascular treatment, and velocity, pulsatility index (PI) and resistance index (RI) were compared with the SmartWire. For both TCD and Smart Wire, blood velocity of the main artery decreased, and PI and RI were improved after embolisation of AVM. In angioplasty cases, post stenotic flow velocity, as measured by SmartWire, was improved, and the flow of MCA measured with TCD was also improved after treatment. The SmartWire is useful to assess cerebral blood flow changes during the neuroendovascular procedure. Combined with repeated follow up with TCD, Doppler flow measurements are useful to assess the effect of endovascular treatment.
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Affiliation(s)
- K Fukui
- Department of Neurosurgery, Nagoya University; Nagoya, Japan
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31
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Adam Z, Adamska I, Nakabayashi K, Ostersetzer O, Haussuhl K, Manuell A, Zheng B, Vallon O, Rodermel SR, Shinozaki K, Clarke AK. Chloroplast and mitochondrial proteases in Arabidopsis. A proposed nomenclature. Plant Physiol 2001; 125:1912-8. [PMID: 11299370 PMCID: PMC88846 DOI: 10.1104/pp.125.4.1912] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2000] [Revised: 10/23/2000] [Accepted: 11/21/2000] [Indexed: 05/18/2023]
Abstract
The identity and scope of chloroplast and mitochondrial proteases in higher plants has only started to become apparent in recent years. Biochemical and molecular studies suggested the existence of Clp, FtsH, and DegP proteases in chloroplasts, and a Lon protease in mitochondria, although currently the full extent of their role in organellar biogenesis and function remains poorly understood. Rapidly accumulating DNA sequence data, especially from Arabidopsis, has revealed that these proteolytic enzymes are found in plant cells in multiple isomeric forms. As a consequence, a systematic approach was taken to catalog all these isomers, to predict their intracellular location and putative processing sites, and to propose a standard nomenclature to avoid confusion and facilitate scientific communication. For the Clp protease most of the ClpP isomers are found in chloroplasts, whereas one is mitochondrial. Of the ATPase subunits, the one ClpD and two ClpC isomers are located in chloroplasts, whereas both ClpX isomers are present in mitochondria. Isomers of the Lon protease are predicted in both compartments, as are the different forms of FtsH protease. DegP, the least characterized protease in plant cells, has the most number of isomers and they are predicted to localize in several cell compartments. These predictions, along with the proposed nomenclature, will serve as a framework for future studies of all four families of proteases and their individual isomers.
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Affiliation(s)
- Z Adam
- Department of Agricultural Botany, The Hebrew University of Jerusalem, Rehovot 76100, Israel.
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32
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Domoto H, Nakabayashi K, Hashimoto A, Suzuki S, Kitamura T. Decrease in platelet count during saturation diving. Aviat Space Environ Med 2001; 72:380-4. [PMID: 11318019] [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
BACKGROUND The change in platelet count (PC) occurring during saturation diving has rarely been discussed. We set out to clarify the details of this change in PC, and its relationship with: i) the storage depth and duration of the saturation dive, and ii) the presence of decompression bubbles. METHODS In a total of 42 divers, the change in PC was measured in 8 simulated saturation dives (1992-1998) using a Deep Diving Simulator with decompression procedures based on the modified DUKE-GKSS schedule. Blood samples were taken before the dive, at the bottom (twice), during decompression, on surfacing, and about 1 wk after surfacing. Decompression bubbles were examined by ultrasonic M-mode echocardiography. RESULTS PC (mean +/- SD x 10(4) x microl(-1)) was 23.9 +/- 4.85, 24.9 +/- 4.9, 24.2 +/- 4.8, 19.2 +/- 4.4*, 20.1 +/- 4.5*, 25.0 +/- 5.1 on the occasions listed above (*= p < 0.05 vs. pre-dive). The PC showed no correlation with either storage depth or dive duration. Decompression bubbles were detected during decompression in only 2 divers (4.8%), and the bubbles disappeared immediately after surfacing. In these 2 divers the decreases in PC values from baseline to the middle of decompression and on surfacing were 2 and 2.7 x 10(4) x microl(-1), and 3.4 and 1.7 x 10(4) x microl(-1) respectively. No diver complained of decompression sickness. CONCLUSION The magnitude of the decrease in PC (< 5 x 10(4) x microl(-1)) and the time to recover to the pre-dive value (< 1 wk) suggests that changes in PC during saturation diving should not cause any clinical problems. The mechanisms underlying the decrease in PC remain unclear.
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Affiliation(s)
- H Domoto
- Japan Maritime Self-Defense Force Undersea Medical Center, Yokosuka, Kanagawa.
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33
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Fröhling S, Nakabayashi K, Scherer SW, Döhner H, Döhner K. Mutation analysis of the origin recognition complex subunit 5 (ORC5L) gene in adult patients with myeloid leukemias exhibiting deletions of chromosome band 7q22. Hum Genet 2001; 108:304-9. [PMID: 11379876 DOI: 10.1007/s004390100498] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The ORC5L gene encoding a subunit of the human origin recognition complex (ORC) maps to chromosome band 7q22, a region frequently deleted in adult acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS). Because of its localization within a region that is commonly deleted in patients with myeloid malignancies and because of the implication of its protein product in cell cycle control (DNA replication) and regulation of gene expression (transcriptional silencing), ORC5L appeared to be a candidate tumor suppressor gene for myeloid disorders associated with 7q22 deletions. Polymerase chain reaction amplification and sequencing analysis of the coding region of the remaining ORC5L allele has not revealed any mutations in nine patients with AML or MDS exhibiting 7q22 deletions. Allelic expression analysis indicates that ORC5L is not imprinted. These data suggest that ORC5L does not function as a tumor suppressor in patients with myeloid neoplasms.
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Affiliation(s)
- S Fröhling
- Abteilung Innere Medizin III, Medizinische Universitätsklinik und Poliklinik, Universität, Ulm, Germany
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Abstract
Contactin-associated genes are members of the neurexin superfamily that encode a group of transmembrane proteins that mediate cell-cell interactions in the nervous system. To study the human contactin-associated protein-like 2 gene (CNTNAP2), we have determined its complete DNA sequence and its genomic organization to comprise 25 exons spanning greater than 2.0 Mb of DNA at 7q35. Our results indicate that CNTNAP2 encompasses almost 1.5% of chromosome 7 and is one of the largest genes in the human genome.
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Affiliation(s)
- K Nakabayashi
- Department of Genetics, University of Toronto, Toronto, Ontario, M5G 1X8, Canada
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35
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Nakayama M, Ichinose H, Yamamoto S, Nakabayashi K, Satoh O, Namiki A. Perioperative intravenous flurbiprofen reduces postoperative pain after abdominal hysterectomy. Can J Anaesth 2001; 48:234-7. [PMID: 11305822 DOI: 10.1007/bf03019751] [Citation(s) in RCA: 26] [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: 10/20/2022] Open
Abstract
PURPOSE To assess whether perioperative intravenous administration of flurbiprofen, a non-steroidal anti-inflammatory drug, reduced postoperative pain after abdominal hysterectomy. METHODS Forty-five patients undergoing abdominal hysterectomy were randomly assigned to one of three groups of equal size. A control group (CONT) received a placebo 30 min before and at the end of surgery. The other two groups, PRE and POST, received 1 mg x kg(-1) flurbiprofen iv 30 min before and at the end of surgery, respectively. All patients received identical general and epidural anesthesia. Postoperatively, 50 mg diclofenac pr was given for pain relief on patient demand. One of the authors assessed pain using a 10 cm visual analog scale at rest and during coughing at the first request for diclofenac, and at 15, 24, 48, and 72 hr after surgery. The number of times diclofenac was required during the first 24 hr after surgery was also recorded. RESULTS The number of diclofenac requests in the PRE (1.8 +/- 0.4) and POST groups (2.0 +/- 0.4) were less than in the CONT group (3.0 +/- 0.4). The PRE group showed lower visual analog scale at rest at 15 and 24 hr and on coughing at 24, 48, and 72 hr after surgery than the CONT and POST groups. CONCLUSION Intravenous 1 mg x kg(-1) flurbiprofen administered during anesthesia reduces postoperative rescue analgesic requirement after abdominal hysterectomy. Moreover, flurbiprofen is more effective when given before than after surgery.
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Affiliation(s)
- M Nakayama
- Division of Anesthesia, Obihiro Kosei Hospital, Japan.
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Abstract
STUDY OBJECTIVE To evaluate the effects of epidurally administered neostigmine on pain after abdominal hysterectomy. DESIGN Prospective, randomized, double-blind study. SETTING Teaching hospital. PATIENTS 45 ASA physical status I adult patients scheduled for abdominal hysterectomy. INTERVENTIONS All patients received identical general and epidural anesthesia. At the end of the surgery, they received epidural bupivacaine (10 mg) with either saline (control group, n = 15), 5 micro g/kg (5-micro g group, n = 15), or 10 micro g/kg neostigmine (10-micro g group, n = 15). Postoperatively, 50 mg diclofenac suppository was given for pain relief on patient demand. MEASUREMENTS AND MAIN RESULTS The time to first diclofenac administration and the number of times diclofenac was required during the first 24 postoperative hours were recorded. Pain was assessed using a 10-cm visual analog pain scale (VAS) at rest at the first diclofenac request, and at 15 and 24 hours after surgery. The time to first diclofenac administration was significantly longer (p < 0.05) in the 10-micro g group (223 +/- 15 min) than in the control (78 +/- 17 min) or 5-micro g groups (88 +/- 18 min). However, epidural neostigmine at both doses did not reduce the number of postoperative diclofenac administrations. There were no differences in VAS among the three groups. CONCLUSIONS Epidural neostigmine of 10 micro g/kg in bupivacaine provides a longer duration of analgesia than does bupivacaine alone or with 5 micro g/kg of neostigmine after abdominal hysterectomy.
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Affiliation(s)
- M Nakayama
- Department of Anesthesiology, Obihiro Kosei Hospital, Obihiro, Japan.
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Kamiya Y, Nakabayashi K, Arimura Y, Nagasawa T. [MPO-ANCA related angiitis]. Nihon Rinsho Meneki Gakkai Kaishi 2000; 23:661-4. [PMID: 11210765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Affiliation(s)
- Y Kamiya
- First Department of Internal Medicine, Kyorin University School of Medicine
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Nakabayashi K, Kudo M, Kobilka B, Hsueh AJ. Activation of the luteinizing hormone receptor following substitution of Ser-277 with selective hydrophobic residues in the ectodomain hinge region. J Biol Chem 2000; 275:30264-71. [PMID: 10889210 DOI: 10.1074/jbc.m005568200] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Glycoprotein hormone receptors are G protein-coupled receptors with ligand-binding ectodomains consisting of leucine-rich repeats. The ectodomain is connected by a conserved cysteine-rich hinge region to the seven transmembrane (TM) region. Gain-of-function mutants of luteinizing hormone (LH) and thyroid-stimulating hormone receptors found in patients allowed identification of residues important for receptor activation. Based on constitutively active mutations at Ser-281 in the hinge region of the thyroid-stimulating hormone receptor, we mutated the conserved serine in the LH (S277I) and follicle-stimulating hormone receptors (S273I) and observed increased basal cAMP production and ligand affinity by mutant receptors. For the LH receptor, conversion of Ser-277 to all natural amino acids led to varying degrees of receptor activation. Hydropathy index analysis indicated that substitution of neutral serine with selective nonpolar hydrophobic residues (Leu>Val>Met>Ile) confers constitutive receptor activation whereas serine deletion or substitution with charged Arg, Lys, or Asp led to defective receptor expression. Furthermore, mutation of the angular proline near Ser-273 to flexible Gly also led to receptor activation. The findings suggest the ectodomain of glycoprotein hormone receptors constrain the TM region. Point mutations in the hinge region of these proteins, or ligand binding to these receptors, could cause conformational changes in the TM region that result in G(s) activation.
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Affiliation(s)
- K Nakabayashi
- Division of Reproductive Biology, Department of Gynecology and Obstetrics and the Department of Medicine, Stanford University School of Medicine, Stanford, California 94305-5317, USA
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Nakabayashi K, Kamiya Y, Nagasawa T. Aortitis syndrome associated with positive perinuclear antineutrophil cytoplasmic antibody: report of three cases. Int J Cardiol 2000; 75 Suppl 1:S89-94; discussion S95-7. [PMID: 10980343 DOI: 10.1016/s0167-5273(00)00176-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We recently experienced three cases of aortitis syndrome that were associated with perinuclear antineutrophil cytoplasmic antibody (ANCA). In the three cases, roentgenographic examination revealed the typical appearance of stenosis or occlusive subclavian arteries. In addition, two cases showed a thickened thoracic aorta wall and the remaining case had irregular stenosis of both common iliac arteries. All three cases had persistently increased ESR and CRP over the years. These findings suggested the diagnosis of aortitis syndrome. ANCA tests were performed because of rapidly progressive glomerulonephritis symptoms in two patients and marked excretion of beta(2)-microglobulin in urine in one patient. The test showed P-ANCA in all three patients, with two patients identified as anti-MPO antibody and the third patient as non-MPO antibody. The implication of ANCA in the pathogenesis of aortitis syndrome is presumed to be: ANCA, which plays an important role in the pathogenesis of small vessel vasculitis, induces vasculitis of the vasa vasorum in the aorta or main branches (or both) and this pathologic process results in the pathogenesis of aortitis syndrome.
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Affiliation(s)
- K Nakabayashi
- First Department of Internal Medicine, Kyorin University School of Medicine, 6-20-2 Shinkawa, Mitaka, Tokyo, Japan
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Hsu SY, Kudo M, Chen T, Nakabayashi K, Bhalla A, van der Spek PJ, van Duin M, Hsueh AJ. The three subfamilies of leucine-rich repeat-containing G protein-coupled receptors (LGR): identification of LGR6 and LGR7 and the signaling mechanism for LGR7. Mol Endocrinol 2000; 14:1257-71. [PMID: 10935549 DOI: 10.1210/mend.14.8.0510] [Citation(s) in RCA: 228] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Glycoprotein hormone receptors, including LH receptor, FSH receptor, and TSH receptor, belong to the large G protein-coupled receptor (GPCR) superfamily but are unique in having a large ectodomain important for ligand binding. In addition to two recently isolated mammalian LGRs (leucine-rich repeat-containing, G protein-coupled receptors), LGR4 and LGR5, we further identified two new paralogs, LGR6 and LGR7, for glycoprotein hormone receptors. Phylogenetic analysis showed that there are three LGR subgroups: the known glycoprotein hormone receptors; LGR4 to 6; and a third subgroup represented by LGR7. LGR6 has a subgroup-specific hinge region after leucine-rich repeats whereas LGR7, like snail LGR, contains a low density lipoprotein (LDL) receptor cysteine-rich motif at the N terminus. Similar to LGR4 and LGR5, LGR6 and LGR7 mRNAs are expressed in multiple tissues. Although the putative ligands for LGR6 and LGR7 are unknown, studies on single amino acid mutants of LGR7, with a design based on known LH and TSH receptor gain-of-function mutations, indicated that the action of LGR7 is likely mediated by the protein kinase A but not the phospholipase C pathway. Thus, mutagenesis of conserved residues to allow constitutive receptor activation is a novel approach for the characterization of signaling pathways of selective orphan GPCRs. The present study also defines the existence of three subclasses of leucine-rich repeat-containing, G protein-coupled receptors in the human genome and allows future studies on the physiological importance of this expanding subgroup of GPCR.
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MESH Headings
- Amino Acid Sequence
- Animals
- Chromosomes, Human, Pair 1
- Chromosomes, Human, Pair 4
- Cloning, Molecular
- Cyclic AMP-Dependent Protein Kinases/metabolism
- GTP-Binding Proteins/metabolism
- Gene Expression Regulation
- Humans
- Mammals
- Membrane Proteins
- Molecular Sequence Data
- Multigene Family
- Mutagenesis, Site-Directed
- Phylogeny
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/metabolism
- Receptors, G-Protein-Coupled
- Receptors, LH/genetics
- Receptors, LH/metabolism
- Receptors, Peptide
- Recombinant Proteins/genetics
- Recombinant Proteins/metabolism
- Repetitive Sequences, Amino Acid
- Sequence Homology, Amino Acid
- Signal Transduction
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Affiliation(s)
- S Y Hsu
- Department of Gynecology and Obstetrics, Stanford University School of Medicine, California 94305-5317, USA
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Nakabayashi K. [Clinical aspects of ANCA-related diseases]. Nihon Naika Gakkai Zasshi 2000; 89:520-3. [PMID: 10804622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Kudo M, Chen T, Nakabayashi K, Hsu SY, Hsueh AJ. The nematode leucine-rich repeat-containing, G protein-coupled receptor (LGR) protein homologous to vertebrate gonadotropin and thyrotropin receptors is constitutively active in mammalian cells. Mol Endocrinol 2000; 14:272-84. [PMID: 10674399 DOI: 10.1210/mend.14.2.0422] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The receptors for LH, FSH, and TSH belong to the large G protein-coupled, seven-transmembrane protein family and are unique in having a large N-terminal extracellular (ecto-) domain containing leucine-rich repeats important for interactions with the large glycoprotein hormone ligands. Recent studies indicated the evolution of an expanding family of homologous leucine-rich repeat-containing, G protein-coupled receptors (LGRs), including the three known glycoprotein hormone receptors; mammalian LGR4 and LGR5; and LGRs in sea anemone, fly, and snail. We isolated nematode LGR cDNA and characterized its gene from the Caenorhabditis elegans genome. This receptor cDNA encodes 929 amino acids consisting of a signal peptide for membrane insertion, an ectodomain with nine leucine-rich repeats, a seven-TM region, and a long C-terminal tail. The nematode LGR has five potential N-linked glycosylation sites in its ectodomain and multiple consensus phosphorylation sites for protein kinase A and C in the cytoplasmic loop and C tail. The nematode receptor gene has 13 exons; its TM region and C tail, unlike mammalian glycoprotein hormone receptors, are encoded by multiple exons. Sequence alignments showed that the TM region of the nematode receptor has 30% identity and 50% similarity to the same region in mammalian glycoprotein hormone receptors. Although human 293T cells expressing the nematode LGR protein do not respond to human glycoprotein hormones, these cells exhibited major increases in basal cAMP production in the absence of ligand stimulation, reaching levels comparable to those in cells expressing a constitutively activated mutant human LH receptor found in patients with familial male-limited precocious puberty. Analysis of cAMP production mediated by chimeric receptors further indicated that the ectodomain and TM region of the nematode LGR and human LH receptor are interchangeable and the TM region of the nematode LGR is responsible for constitutive receptor activation. Thus, the identification and characterization of the nematode receptor provides the basis for understanding the evolutionary relationship of diverse LGRs and for future analysis of mechanisms underlying the activation of glycoprotein hormone receptors and related LGRs.
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Affiliation(s)
- M Kudo
- Department of Gynecology and Obstetrics, Stanford University School of Medicine, California 94305-5317, USA
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Yoshihara K, Nakabayashi K. [Churg-Strauss syndrome]. Ryoikibetsu Shokogun Shirizu 2000:318-21. [PMID: 11269093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Affiliation(s)
- K Yoshihara
- First Department of Internal Medicine, Kyorin University School of Medicine
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Michishita E, Nakabayashi K, Suzuki T, Kaul SC, Ogino H, Fujii M, Mitsui Y, Ayusawa D. 5-Bromodeoxyuridine induces senescence-like phenomena in mammalian cells regardless of cell type or species. J Biochem 1999; 126:1052-9. [PMID: 10578056 DOI: 10.1093/oxfordjournals.jbchem.a022549] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
5-Bromodeoxyuridine was found to induce flat and enlarged cell shape, characteristics of senescent cells, and senescence-associated beta-galactosidase in mammalian cells regardless of cell type or species. In immortal human cells, fibronectin, collagenase I, and p21(wafl/sdi-1) mRNAs were immediately and very strongly induced, and the mortality marker mortalin changed to the mortal type from the immortal type. Human cell lines lacking functional p21(wafl/sdi-1), p16(ink4a), or p53 behaved similarly. The protein levels of p16(ink4a) and p53 did not change uniformly, while the level of p21(wafl/sdi-1) was increased by varying degrees in positive cell lines. Telomerase activity was suppressed in positive cell lines, but accelerated telomere shortening was not observed in tumor cell lines. These results suggest that 5-bromodeoxyuridine activates a common senescence pathway present in both mortal and immortal mammalian cells.
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Affiliation(s)
- E Michishita
- Kihara Institute for Biological Research and Graduate School of Integrated Science, Yokohama City University, Totsuka-ku, Yokohama, 244-0813, Japan
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Nakabayashi K, Ogino H, Michishita E, Satoh N, Ayusawa D. Introduction of chromosome 7 suppresses telomerase with shortening of telomeres in a human mesothelial cell line. Exp Cell Res 1999; 252:376-82. [PMID: 10527627 DOI: 10.1006/excr.1999.4619] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Introduction of human chromosome 7 by microcell-mediated chromosome transfer induced senescence in a telomerase-positive human mesothelial cell line, MeT5A. In microcell hybrids which underwent senescence, telomerase activity was decreased before entering senescence and telomeric sequences were shortened as cell division proceeded. Concomitantly, expression of the gene encoding telomerase catalytic subunit was abolished, whereas the genes encoding the RNA component of telomerase and its associated protein TEP1 were not affected. In revertants which arose from such microcell hybrids, telomerase activity was restored and the telomeric sequences were elongated. In microcell hybrids which showed no growth arrest, telomerase activity was unaltered. These results suggest that a putative mortality gene on chromosome 7 negatively regulates the telomere maintenance mechanism in MeT5A.
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Affiliation(s)
- K Nakabayashi
- Kihara Institute for Biological Research, Graduate School of Integrated Science, Yokohama City University, Totsuka-ku, Maioka-cho 641-12, Yokohama, 244-0813, Japan
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Aoki F, Nakabayashi K, Wataya Y, Kankawa S, Kaneda S, Ayusawa D, Seno T. Defective DNA replication and repair associated with decreases in deoxyribonucleotide pools in a mouse cell mutant with thermolabile ubiquitin-activating enzyme E1. J Biochem 1999; 126:845-51. [PMID: 10544276 DOI: 10.1093/oxfordjournals.jbchem.a022525] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Upon shift-up in temperature, mouse tsFS20 mutant cells with thermolabile ubiquitin-activating enzyme E1 immediately stopped DNA replication and showed cell cycle arrest in S-phase. In contrast, when the cells were permeabilized with lysolecithin after culture at the nonpermissive temperature, they exhibited a normal level of replicative DNA synthesis in vitro. In agreement with this, intracellular pools of deoxyribonucleoside triphosphates were significantly reduced in the cells cultured at the nonpermissive temperature. Even under the permissive conditions, tsFS20 cells were more sensitive to hydroxyurea and alkylating agents, and induced less mutation than the wild-type cells. These results suggest that the ubiquitin system affects DNA replication and repair.
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Affiliation(s)
- F Aoki
- Laboratory of Mutagenesis, National Institute of Genetics, Yata, Mishima, 411-0801, Japan
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Furukawa Y, Fujisawa Y, Minakata H, Nakamaru K, Wakayama H, Nakabayashi K, Morishita F, Matsushima O, Ellis TA, Dembrow NC, Weiss KR, Vilim FS. The Enterins: A novel family of neuropeptides isolated from the enteric and central nervous system of Aplysia. Comp Biochem Physiol A Mol Integr Physiol 1999. [DOI: 10.1016/s1095-6433(99)90055-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Nakabayashi K. Atypical Wegener's granulomatosis--is there a need of new concept for progressive clinical staging? Intern Med 1999; 38:619. [PMID: 10440495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/13/2023] Open
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Fujii M, Joguchi A, Ogino H, Nakabayashi K, Ayusawa D. Dephosphorylation of specific proteins during induction of senescence in immortal human fibroblasts expressing thermolabile SV40 T antigen. Biosci Biotechnol Biochem 1999; 63:1116-8. [PMID: 10427701 DOI: 10.1271/bbb.63.1116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Particular protein kinase inhibitors block a senescence-like phenomenon in SVts8 cells induced by a shift up in temperature. We characterized cellular proteins with affinity chromatography using one such inhibitor as a ligand. Two proteins of 56 and 100 kDa were found to be dephosphorylated specifically, probably due to induction of a protein phosphatase activity(s).
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Affiliation(s)
- M Fujii
- Division of Biochemistry, Kihara Institute for Biological Research, Yokohama, Japan
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Abstract
Clp protease is a highly selective protease in E. coli, which consists of two types of subunits, the regulatory subunit with ATPase activity, ClpA, and the catalytic subunit, ClpP. In order to examine the possible association of plant Clp protease with the degradation of protein in senescing chloroplasts, we isolated a cDNA clone for ClpC which is a plant homologue of ClpA from Arabidopsis thaliana in addition to ERD1 which we had isolated earlier [Kiyosue et al. (1993) Biochem. Biophys. Res. Commun. 196: 1214]. We also isolated a clone for the plastidic gene, clpP (pclpP) and cDNA clones for putative nuclear clpP genes (nclpP1-6). We analyzed the expression of these clp genes in Arabidopsis leaves after various dark periods and during natural senescence. The expression of erd1 was increased by dark-induced and by natural senescence, as reported earlier [Nakashima et al. (1997) Plant J. 12: 851], while that of AtclpC was decreased. Two catalytic subunits nclpPs (nclpP3 and nclpP5) showed high expression in naturally senescing leaves, but the expression of pclpP and the other nclpPs was not changed. Immunoblot analysis of chloroplast protein and in vitro import analysis demonstrated that both nucleus-encoded regulatory subunits as well as nClpP5 were localized in the chloroplast stroma. These observations suggest that chloroplast Clp protease is composed of very complicated combinations of subunits, and that ERD1, nClpP5 and pClpP have a role in the concerted degradation of protein in senescing chloroplasts.
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Affiliation(s)
- K Nakabayashi
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, Japan
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