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Funai T, Tagawa C, Nakagawa O, Wada SI, Ono A, Urata H. Enzymatic formation of consecutive thymine–HgII–thymine base pairs by DNA polymerases. Chem Commun (Camb) 2020; 56:12025-12028. [DOI: 10.1039/d0cc04423g] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Ten consecutive T–HgII–T base pairs were successfully formed by DNA polymerase-catalyzed primer extension reactions.
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Affiliation(s)
- Tatsuya Funai
- Department of Bioorganic Chemistry
- Osaka University of Pharmaceutical Sciences
- 4-20-1 Nasahara
- Takatsuki
- Japan
| | - Chizuko Tagawa
- Department of Bioorganic Chemistry
- Osaka University of Pharmaceutical Sciences
- 4-20-1 Nasahara
- Takatsuki
- Japan
| | - Osamu Nakagawa
- Department of Bioorganic Chemistry
- Osaka University of Pharmaceutical Sciences
- 4-20-1 Nasahara
- Takatsuki
- Japan
| | - Shun-ichi Wada
- Department of Bioorganic Chemistry
- Osaka University of Pharmaceutical Sciences
- 4-20-1 Nasahara
- Takatsuki
- Japan
| | - Akira Ono
- Department of Material & Life Chemistry
- Faculty of Engineering, Kanagawa University
- 3-27-1 Rokkakubashi
- Kanagawa-ku
- Japan
| | - Hidehito Urata
- Department of Bioorganic Chemistry
- Osaka University of Pharmaceutical Sciences
- 4-20-1 Nasahara
- Takatsuki
- Japan
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Funai T, Aotani M, Kiriu R, Nakamura J, Miyazaki Y, Nakagawa O, Wada S, Torigoe H, Ono A, Urata H. Silver(I)‐Ion‐Mediated Cytosine‐Containing Base Pairs: Metal Ion Specificity for Duplex Stabilization and Susceptibility toward DNA Polymerases. Chembiochem 2019; 21:517-522. [DOI: 10.1002/cbic.201900450] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Tatsuya Funai
- Department of Bioorganic ChemistryOsaka University of Pharmaceutical Sciences 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan
| | - Megumi Aotani
- Department of Bioorganic ChemistryOsaka University of Pharmaceutical Sciences 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan
| | - Risa Kiriu
- Department of Bioorganic ChemistryOsaka University of Pharmaceutical Sciences 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan
| | - Junko Nakamura
- Department of Bioorganic ChemistryOsaka University of Pharmaceutical Sciences 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan
| | - Yuki Miyazaki
- Department of Bioorganic ChemistryOsaka University of Pharmaceutical Sciences 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan
| | - Osamu Nakagawa
- Department of Bioorganic ChemistryOsaka University of Pharmaceutical Sciences 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan
- Present address: Graduate School of Pharmaceutical SciencesOsaka University 1–6 Yamadaoka, Suita Osaka 565-0871 Japan
| | - Shun‐ichi Wada
- Department of Bioorganic ChemistryOsaka University of Pharmaceutical Sciences 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan
| | - Hidetaka Torigoe
- Department of Applied ChemistryFaculty of ScienceTokyo University of Science 1-3 Kagurazaka, Shinjuku-ku Tokyo 162-8601 Japan
| | - Akira Ono
- Department of Material and Life ChemistryFaculty of EngineeringKanagawa University 3-27-1 Rokkakubashi Kanagawa-ku, Yokohama 221-8686 Japan
| | - Hidehito Urata
- Department of Bioorganic ChemistryOsaka University of Pharmaceutical Sciences 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan
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Funai T, Adachi N, Aotani M, Wada SI, Urata H. Effects of metal ions on thermal stabilities of DNA duplexes containing homo- and heterochiral mismatched base pairs: comparison of internal and terminal substitutions. Nucleosides Nucleotides Nucleic Acids 2019; 39:310-321. [PMID: 31514571 DOI: 10.1080/15257770.2019.1658116] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The effects of metal ions on the stabilities of duplexes containing a D-homochiral and heterochiral mismatched base pairs were studied. In some duplexes containing an internal mismatched base pair, significant stabilization by HgII and AgI ions was observed. While, in duplexes containing a terminal mismatched base pair, only the duplexes containing T-T and LT-T mispairs were significantly stabilized by HgII ions, and the stabilities of the duplexes containing T-T and LT-T mispairs exceeded those of the corresponding homochiral matched duplex. The results suggest that the formation of homo- and heterochiral T-HgII-T base pairs at duplex termini would be useful for the thermal and enzymatic stabilization of DNA-based nanodevice.
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Affiliation(s)
- Tatsuya Funai
- Department of Bioorganic Chemistry, Osaka University of Pharmaceutical Sciences, Takatsuki, Osaka, Japan
| | - Nahomi Adachi
- Department of Bioorganic Chemistry, Osaka University of Pharmaceutical Sciences, Takatsuki, Osaka, Japan
| | - Megumi Aotani
- Department of Bioorganic Chemistry, Osaka University of Pharmaceutical Sciences, Takatsuki, Osaka, Japan
| | - Shun-Ichi Wada
- Department of Bioorganic Chemistry, Osaka University of Pharmaceutical Sciences, Takatsuki, Osaka, Japan
| | - Hidehito Urata
- Department of Bioorganic Chemistry, Osaka University of Pharmaceutical Sciences, Takatsuki, Osaka, Japan
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Funai T, Nakamura J, Miyazaki Y, Kiriu R, Nakagawa O, Wada SI, Ono A, Urata H. Back Cover: Regulated Incorporation of Two Different Metal Ions into Programmed Sites in a Duplex by DNA Polymerase Catalyzed Primer Extension (Angew. Chem. Int. Ed. 26/2014). Angew Chem Int Ed Engl 2014. [DOI: 10.1002/anie.201401152] [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: 11/06/2022]
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Funai T, Nakamura J, Miyazaki Y, Kiriu R, Nakagawa O, Wada SI, Ono A, Urata H. Rücktitelbild: Regulated Incorporation of Two Different Metal Ions into Programmed Sites in a Duplex by DNA Polymerase Catalyzed Primer Extension (Angew. Chem. 26/2014). Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201401152] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Funai T, Nakamura J, Miyazaki Y, Kiriu R, Nakagawa O, Wada SI, Ono A, Urata H. Regulated Incorporation of Two Different Metal Ions into Programmed Sites in a Duplex by DNA Polymerase Catalyzed Primer Extension. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201311235] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Funai T, Nakamura J, Miyazaki Y, Kiriu R, Nakagawa O, Wada SI, Ono A, Urata H. Regulated Incorporation of Two Different Metal Ions into Programmed Sites in a Duplex by DNA Polymerase Catalyzed Primer Extension. Angew Chem Int Ed Engl 2014; 53:6624-7. [DOI: 10.1002/anie.201311235] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Indexed: 12/17/2022]
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Funai T, Miyazaki Y, Aotani M, Yamaguchi E, Nakagawa O, Wada SI, Torigoe H, Ono A, Urata H. AgI Ion Mediated Formation of a C-A Mispair by DNA Polymerases. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201109191] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Funai T, Miyazaki Y, Aotani M, Yamaguchi E, Nakagawa O, Wada SI, Torigoe H, Ono A, Urata H. AgI Ion Mediated Formation of a C-A Mispair by DNA Polymerases. Angew Chem Int Ed Engl 2012; 51:6464-6. [DOI: 10.1002/anie.201109191] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Revised: 04/16/2012] [Indexed: 01/13/2023]
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Urata H, Yamaguchi E, Funai T, Matsumura Y, Wada SI. Incorporation of thymine nucleotides by DNA polymerases through T-Hg(II)-T base pairing. Angew Chem Int Ed Engl 2011; 49:6516-9. [PMID: 20602391 DOI: 10.1002/anie.201002142] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hidehito Urata
- Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan.
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Urata H, Yamaguchi E, Funai T, Matsumura Y, Wada SI. Incorporation of Thymine Nucleotides by DNA Polymerases through T-HgII-T Base Pairing. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201002142] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Oda T, Mizuno T, Ito K, Funai T, Ichiyama A, Miura S. Peroxisomal and mitochondrial targeting of serine:pyruvate/alanine:glyoxylate aminotransferase in rat liver. Cell Biochem Biophys 2001; 32 Spring:277-81. [PMID: 11330058 DOI: 10.1385/cbb:32:1-3:277] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Serine:pyruvate/alanine:glyoxylate aminotransferase (SPT or SPT/AGT) of rat liver is a unique enzyme of dual subcellular localization, and exists in both mitochondria and peroxisomes. To characterize a peroxisomal targeting signal of rat liver SPT, a number of C-terminal mutants were constructed and their subcellular localization in transfected COS-1 cells was examined. Deletion of C-terminal NKL, and point mutation of K2 (the second Lys from the C-terminus), K4 and E15 caused accumulation of translated products in the cytoplasm. This suggests that the PTS of SPT is not identical to PTS1 (the C-terminal SKL motif) in that it is not restricted to the C-terminal tripeptide. In vitro synthesized precursor for mitochondrial SPT was highly sensitive to the proteinase K digestion, whereas peroxisomal SPT (SPTp) was fairly resistant to the protease. In in vitro import experiment with purified peroxisomes, however, SPTp recovered in the peroxisomal fraction was very sensitive to the protease. These results suggest that the mitochondrial precursor is synthesized as an unfolded form and is translocated into the mitochondrial matrix, whereas SPTp is synthesized as a folded form and its conformation changes to an unfolded form just before translocation into peroxisomes.
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Affiliation(s)
- T Oda
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
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Abstract
BACKGROUND The preoperative evaluation of lymphatic metastasis in patients with oesophageal cancer is of vital importance in determining a therapeutic strategy. The aim of this study was to establish criteria for the preoperative diagnosis of lymph node metastases based on the size and shape of nodes. METHODS Some 123 patients with intrathoracic oesophageal cancer were studied and 6822 nodes were obtained by extended lymphadenectomy. The nodes were classified anatomically and their size was measured by the operating surgeon during or immediately after operation. All were examined histologically and criteria for the diagnosis of metastasis were evaluated. RESULTS The size of the lymph nodes varied by anatomical site. Nodes were smallest in the neck and largest at the tracheal bifurcation. The cut-off value for the diagnosis of metastasis was 5 mm in the neck, 6 mm in the abdomen and 8 mm in the mediastinum, except for tracheal nodes. Lymph nodes 10 mm or larger tended to become spherical when involved by metastasis. CONCLUSION The incidence of metastasis in each lymph node can be estimated by its size. Discounting nodes less than 10 mm can lead to an underestimation of the stage of oesophageal cancer during preoperative evaluation.
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Affiliation(s)
- T Funai
- Second Department of Surgery, Osaka City University Medical School, 1-4-3, Asahi-machi, Abeno-ku, Osaka 545-8585, Japan
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Oda T, Funai T, Ichiyama A. Induction by peroxisome proliferators and triiodothyronine of serine:pyruvate/alanine:glyoxylate aminotransferase of rat liver. FEBS Lett 1997; 418:265-8. [PMID: 9428725 DOI: 10.1016/s0014-5793(97)01396-3] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In rat liver, a single serine:pyruvate/alanine:glyoxylate aminotransferase (SPT or SPT/AGT) gene is transcribed from two transcription initiation sites. Transcription from the upstream site generates the mRNA encoding the precursor for mitochondrial SPT (pSPTm) and is markedly enhanced by the administration of glucagon or cAMP. In this report we show the increase in the downstream transcript, the peroxisomal SPT (SPTp) mRNA, caused by peroxisome proliferators and triiodothyronine (T3). In the case of T3, the pSPTm mRNA was also increased 72 h after a single administration of the hormone in addition to an earlier increase in SPTp mRNA.
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Affiliation(s)
- T Oda
- Department of Biochemistry, Hamamatsu University School of Medicine, Shizuoka, Japan.
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Oda T, Funai T, Miura S. In vitro association with peroxisomes and conformational change of peroxisomal serine:pyruvate/alanine:glyoxylate aminotransferase in rat and human livers. Biochem Biophys Res Commun 1996; 228:341-6. [PMID: 8920916 DOI: 10.1006/bbrc.1996.1663] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
To understand the targeting mechanisms of peroxisomal serine:pyruvate aminotransferase, in vitro import experiments were carried out using this 43 kDa peroxisomal enzyme, which was synthesized in a coupled transcription/translation system. Being different from other peroxisomal enzymes, such as acyl-CoA oxidase and urate oxidase used in previous in vitro import experiment, the soluble form of peroxisomal serine:pyruvate aminotransferase was fairly resistant to proteinase K digestion. However, the enzyme recovered in the peroxisomal fraction was proteinase K sensitive. This indicates that the association of peroxisomal serine:pyruvate aminotransferase with the peroxisomal membrane causes a marked conformational change in the structure of this protein.
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Affiliation(s)
- T Oda
- Department of Biochemistry, Hamamatsu University School of Medicine, Shizuoka, Japan.
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Suzuki T, Nishiyama K, Funai T, Tanaka K, Ichihara A, Ichiyama A. Energy-dependent degradation of a mutant serine: pyruvate/alanin: glyoxylate aminotransferase in a primary hyperoxaluria type 1 case. Adv Exp Med Biol 1996; 389:137-40. [PMID: 8861003 DOI: 10.1007/978-1-4613-0335-0_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- T Suzuki
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu, Japan
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Funai T, Ichiyama A. Fidelity of translation initiation of mRNA for the precursor of rat mitochondrial serine:pyruvate/alanine:glyoxylate aminotransferase. J Biochem 1995; 117:1008-16. [PMID: 8586612 DOI: 10.1093/oxfordjournals.jbchem.a124799] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Serine:pyruvate/alanine:glyoxylate aminotransferase (SPT/AGT) of rat liver is localized in both mitochondria and peroxisomes. The rat SPT/AGT gene is single, but there are two species of mRNA which differ at their 5' termini due to transcription from two alternative initiation sites. The longer mRNA is translated from the first AUG codon and thereby directs synthesis of the 45 kDa precursor of mitochondrial SPT/AGT, which includes a mitochondria-targeting N-terminal signal sequence. Peroxisomal SPT/AGT is synthesized as a product of mature size (43 kDa) from the shorter mRNA, which starts 3' to the first AUG codon and thus is translated from a downstream AUG codon. In our previous immunocytochemical study, SPT/AGT was found to be localized only in peroxisomes, when a cDNA encoding 43 kDa SPT/AGT was expressed in COS cells. When a cDNA encoding the 45 kDa precursor was expressed, on the other hand, SPT/AGT was localized mostly in mitochondria, but a small number of peroxisomes were also positively stained [Yokota, S., Funai, T., and Ichiyama, A. (1991) Biomed. Res. 12, 53-59]. We show in this paper that 43 kDa SPT/AGT is also synthesized from the longer mRNA in an in vitro translation system through a leaky scanning mechanism. Although the first AUG initiator codon is in a suboptimal context, the amount of 43 kDa SPT/AGT synthesized from the longer mRNA was small, probably because a downstream stem-loop structure facilitates recognition of the first AUG initiator codon.
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Affiliation(s)
- T Funai
- Department of Biochemistry, Hamamatsu University School of Medicine, Shizuoka
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Miura S, Oda T, Funai T, Ito M, Okada Y, Ichiyama A. Urate oxidase is imported into peroxisomes recognizing the C-terminal SKL motif of proteins. Eur J Biochem 1994; 223:141-6. [PMID: 8033887 DOI: 10.1111/j.1432-1033.1994.tb18975.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Rat liver urate oxidase synthesized from cDNA through coupled transcription and translation was incubated at 26 degrees C for 60 min with purified peroxisomes from rat liver. Urate oxidase was efficiently imported into the peroxisomes, as determined by resistance to externally added proteinase K. The amount of imported urate oxidase increased with time and the import was temperature dependent. A synthetic peptide composed of the C-terminal 10 amino acid residues of acyl-CoA oxidase (the C-terminal tripeptide is Ser-Lys-Leu) inhibited the import of urate oxidase, whereas other peptides, in which the C-terminal Ser-Lys-Leu (SKL) sequence was deleted or mutated, were not effective. Two mutant urate oxidase proteins in which the C-terminal Ser-Arg-Leu (SRL) sequence was deleted or mutated to Ser-Glu-Leu (SEL) were not imported into peroxisomes. With substitution of a lysine residue for arginine in the SRL tripeptide at the C-terminus the import activity was retained. These results show that urate oxidase is important into peroxisomes via a common pathway with acyl-CoA oxidase, and that the C-terminal SRL sequence functions as a peroxisomal-targeting signal.
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Affiliation(s)
- S Miura
- Radioisotope Research Center, Yokohama City University School of Medicine, Japan
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Uchida C, Funai T, Oda T, Ohbayashi K, Ichiyama A. Regulation by glucagon of serine: pyruvate/alanine: glyoxylate aminotransferase gene expression in cultured rat hepatocytes. J Biol Chem 1994; 269:8849-56. [PMID: 8132620] [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: 01/29/2023] Open
Abstract
The effects of glucagon on serine: pyruvate/alanine: glyoxylate aminotransferase (SPT/AGT) gene expression were studied in primary cultured rat hepatocytes. When hepatocytes had been precultured for 16-18 h under serum- and hormone-free conditions, the addition of glucagon caused (after a lag period of about 2 h) a remarkable increase in the cellular level of SPT/AGT mRNA by 4 h in a time- and dose-dependent manner. The induced mRNA was that for mitochondrial SPT/AGT, as judged by ribonuclease protection analysis. A nuclear run-on assay revealed that activation of transcription is responsible for the increase in mitochondrial SPT/AGT mRNA and that the maximal rate of transcription occurs 1.5 h after glucagon addition. The effect of glucagon was mimicked by 8-bromo-cAMP and suppressed by N-[2-(p-bromocinnamylamino)ethyl]-5-isoquinolinesulfonamide, an inhibitor of cAMP-dependent protein kinase (protein kinase A), while both 12-O-tetradecanoylphorbol-13-acetate and A23187 were without effect in elevating the SPT/AGT mRNA level, suggesting that the cAMP/protein kinase A system is involved in the regulation of SPT/AGT gene expression. In hepatocytes precultured for 16-18 h under serum- and hormone-free conditions, the glucagon-induced transcription was severely inhibited by cycloheximide. When the preculture was for 2 h, on the other hand, the activation of transcription by glucagon was more rapid, and the inhibition by cycloheximide was less than that observed with cells precultured for 16-18 h, suggesting that a short-lived protein factor is involved in the hormonal regulation. The glucagon-induced expression of the SPT/AGT gene was also turned off by dexamethasone.
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Affiliation(s)
- C Uchida
- Department of Biochemistry, Hamamatsu University School of Medicine, Shizuoka, Japan
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Uchida C, Funai T, Oda T, Ohbayashi K, Ichiyama A. Regulation by glucagon of serine: pyruvate/alanine: glyoxylate aminotransferase gene expression in cultured rat hepatocytes. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)37046-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Nishiyama K, Funai T, Yokota S, Ichiyama A. ATP-dependent degradation of a mutant serine: pyruvate/alanine:glyoxylate aminotransferase in a primary hyperoxaluria type 1 case. J Cell Biol 1993; 123:1237-48. [PMID: 8245128 PMCID: PMC2119878 DOI: 10.1083/jcb.123.5.1237] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Primary hyperoxaluria type 1 (PH 1), an inborn error of glyoxylate metabolism characterized by excessive synthesis of oxalate and glycolate, is caused by a defect in serine:pyruvate/alanine:glyoxylate aminotransferase (SPT/AGT). This enzyme is peroxisomal in human liver. Recently, we cloned SPT/AGT-cDNA from a PH 1 case, and demonstrated a point mutation of T to C in the coding region of the SPT/AGT gene encoding a Ser to Pro substitution at residue 205 (Nishiyama, K., T. Funai, R. Katafuchi, F. Hattori, K. Onoyama, and A. Ichiyama. 1991. Biochem. Biophys. Res. Commun. 176:1093-1099). In the liver of this patient, SPT/AGT was very low with respect to not only activity but also protein detectable on Western blot and immunoprecipitation analyses. Immunocytochemically detectable SPT/AGT labeling was also low, although it was detected predominantly in peroxisomes. On the other hand, the level of translatable SPT/AGT-mRNA was higher than normal, indicating that SPT/AGT had been synthesized in the patient's liver at least as effectively as in normal liver. Rapid degradation of the mutant SPT/AGT was then demonstrated in transfected COS cells and transformed Escherichia coli, accounting for the low level of immunodetectable mutant SPT/AGT in the patient's liver. The mutant SPT/AGT was also degraded much faster than normal in an in vitro system with a rabbit reticulocyte extract, and the degradation in vitro was ATP dependent. These results indicate that a single amino acid substitution in SPT/AGT found in the PH1 case leads to a reduced half-life of this protein. It appears that the mutant SPT/AGT is recognized in cells as an abnormal protein to be eliminated by degradation.
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Affiliation(s)
- K Nishiyama
- Department of Biochemistry, Hamamatsu University School of Medicine, Shizuoka, Japan
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Komatsu K, Tanaka I, Funai T, Ichiyama A, Yoshimi T. Increased level of atrial natriuretic peptide messenger RNA in the hypothalamus and brainstem of spontaneously hypertensive rats. J Hypertens 1992; 10:17-23. [PMID: 1312545 DOI: 10.1097/00004872-199201000-00004] [Citation(s) in RCA: 11] [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: 12/26/2022]
Abstract
OBJECTIVE The aim of this study was to investigate atrial natriuretic peptide (ANP) gene expression in the central nervous system (CNS) during hypertension. METHODS We measured and compared immunoreactive atrial natriuretic peptide (irANP) and ANP messenger RNA (mRNA) in the hypothalamus and brainstem of 17-week-old spontaneously hypertensive rats (SHR) with those of age-matched Wistar-Kyoto (WKY) rats using ribonuclease (RNase) protection assay for ANP mRNA and a specific radioimmunoassay for irANP. RESULTS RNase protection assay revealed that the concentrations of ANP mRNA in the hypothalamus and brainstem of SHR were higher than those of WKY rats. IrANP concentrations in the hypothalamus and brainstem of SHR were determined by a specific radioimmunoassay and found to be higher than those of WKY rats. Elevated mRNA levels in the hypothalamus and brainstem of SHR indicated that increased level of irANP in the CNS resulted from increased synthesis of ANP. CONCLUSION We propose that increased synthesis of brain ANP in SHR may reflect a compensatory mechanism induced by hypertension.
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Affiliation(s)
- K Komatsu
- Second Department of Internal Medicine, Hamamatsu University School of Medicine, Japan
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Yodozawa S, Tsunoda Y, Funai T, Tashiro Y. Dynamics of Ca2+ transients in norepinephrine-stimulated individual H-35 hepatoma cells: fura-2 digital imaging microscopy and high time-resolution microspectrofluorometry. J Histochem Cytochem 1991; 39:1311-9. [PMID: 1940304 DOI: 10.1177/39.10.1940304] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
We investigated spatiotemporal changes in cytoplasmic free Ca2+ concentration ([Ca2+]i) in norepinephrine (NE)-stimulated and fura-2-loaded individual H-35 rat hepatoma cells, using digital imaging microscopy and high time-resolution microspectrofluorometry. Application of NE (5 x 10(-6) M) resulted in an initial transient increase in [Ca2+]i, followed by a small sustained [Ca2+]i plateau above the pre-stimulation level. The initial peak and the small sustained plateau originated from intracellular stores and the extracellular space, respectively. The initial transient evoked by NE was totally blocked by phentolamine, an alpha-adrenergic antagonist, but was not blocked by either pre-incubation with nominally Ca(2+)-free medium or by pre-treatment of cells with La3+. On the other hand, the sustained plateau was eliminated by Ca(2+)-free medium or La3+. Therefore, H-35 cells have a Ca(2+)-signaling pathway which is activated via alpha-adrenergic receptors. Mn2+ entered the cytosol after NE stimulation, as shown by quenching of fura-2. This indicates that H-35 hepatoma cells possess Mn(2+)-permeable Ca2+ channels at the plasma membrane. In addition, the Ca2+ efflux pattern from H-35 cells to the extracellular space during NE stimulation was visualized by digital imaging microscopy when free fura-2 was equilibrated between the cells and the extracellular space. The efflux of Ca2+ from H-35 begins between the initial [Ca2+]i transient and the sustained [Ca2+]i plateau.
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Affiliation(s)
- S Yodozawa
- Department of Physiology, Kansai Medical University, Osaka, Japan
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Funai T, Yodozawa S, Tashiro Y. Ca2+ dynamics in rat pancreatic AR-42J and AR-IP cells. Cell Struct Funct 1991; 16:411-7. [PMID: 1769073 DOI: 10.1247/csf.16.411] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Spatiotemporal change of the cytosolic free Ca2+ concentration ([Ca2+]i) in response to a variety of secretagogues was examined in rat pancreatoma AR-42J and AR-IP cells by microspectroflurometry and digital imaging microscopy after loading with fura-2. In the presence of external Ca2+, carbachol, CCK-OP (cholecystokinin-octapeptide), gastrin, norepinephrine or high K+ evoked a large transient increase in [Ca2+]i in AR-42J cells which declined to a sustained level before slowly declining towards the resting level. In the absence of external Ca2+, a transient increase in [Ca2+]i were evoked by all the ligands except for high K+ stimulation, which declined rapidly towards the resting level. The [Ca2+]i increase caused by carbachol and high K+ treatment was inhibited by muscarinic receptor antagonist, atropine, and by L-type Ca2+ channel blocker, nifedipine, respectively. The transient [Ca2+]i increase induced by gastrin stimulation was not blocked by Ca2+ channel blocker, lanthanum. In the AR-IP cells, which are non-differentiated pancreatoma cell line, all stimulations including high K+ treatment have failed to evoke [Ca2+]i response. These intracellular Ca2+ mobilizations in response to ligands in AR-42J cells were displayed by digital imaging microscopy. From these results we conclude that AR-42J cells has an alpha-adrenergic receptor, in addition to muscarinic acetylcholine receptor, CCK-OP receptor, gastrin receptor and voltage dependent Ca2+ channel. In marked contrast, AR-IP cells have neither any hormone receptor for the above ligands nor voltage dependent Ca2+ channel.
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Affiliation(s)
- T Funai
- Department of Physiology, Kansai Medical University, Osaka, Japan
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Nakanishi T, Funahashi S, Funai T, Hashimoto T, Shimizu A. Chemical diagnosis of Fabry's disease by fluorometric assay and fast atom bombardment/mass spectrometry. Ann Clin Biochem 1991; 28 ( Pt 4):368-72. [PMID: 1654042 DOI: 10.1177/000456329102800410] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We report the results of a fluorometric assay for alpha-galactosidase A (EC.3.2.1.22) in plasma and leukocytes, and fast atom bombardment/mass spectrometry (FAB/MS) analysis of glycosphingolipids in urine sediments from a patient with Fabry's disease. In plasma, this patient had only 5.0% of the normal amount of alpha-galactosidase A, and his brother and mother had 11.0% and 25.0%, respectively. In leukocytes, the activities were below 8.0%. Glycosphingolipids from urine sediments were partially purified using a Sep-Pack C18 cartridge. The chemical diagnosis of Fabry's disease can be made more rapidly and accurately using fluorometric and FAB/MS analyses.
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Affiliation(s)
- T Nakanishi
- Research and Clinical Laboratory, Osaka National Hospital, Japan
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Nishiyama K, Funai T, Katafuchi R, Hattori F, Onoyama K, Ichiyama A. Primary hyperoxaluria type I due to a point mutation of T to C in the coding region of the serine:pyruvate aminotransferase gene. Biochem Biophys Res Commun 1991; 176:1093-9. [PMID: 2039493 DOI: 10.1016/0006-291x(91)90396-o] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [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: 12/29/2022]
Abstract
cDNA clones for serine:pyruvate aminotransferase (SPT, alternative name: alanine:glyoxylate aminotransferase) were obtained from a cDNA library constructed from the liver of a primary hyperoxaluria type I (PH1) case in which the SPT activity was approximately one-hundredth that in control liver. Six clones were isolated from 100,000 transformants and all of them contained an approximately 1.5 kbp insert which included the whole coding region for human SPT. Nucleotide sequence analysis revealed a point mutation of T to C at position 634 (relative to the 5'-end of the cDNA) encoding a Ser to Pro substitution at residue 205. The T to C conversion created a new SmaI site, which enabled us to demonstrate that the point mutation had occurred in the patient's SPT gene. SmaI digestion of genomic DNA may be useful for the diagnostic gene analysis of this type of PH1.
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Affiliation(s)
- K Nishiyama
- Department of Biochemistry, Hamamatsu University School of Medicine, Shizuoka, Japan
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27
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Oda T, Funai T, Ichiyama A. Generation from a single gene of two mRNAs that encode the mitochondrial and peroxisomal serine:pyruvate aminotransferase of rat liver. J Biol Chem 1990; 265:7513-9. [PMID: 2332438] [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: 12/31/2022] Open
Abstract
In rat liver there are two types of serine:pyruvate aminotransferase (SPT) whose natures are indistinguishable but whose subcellular localization are different. One is a mitochondrial enzyme (SPTm) and the other a peroxisomal enzyme (SPTp). We compared, in this study, the structure of mRNAs encoding SPTm and SPTp by comparison of the sizes after removal of poly(A) tail by ribonuclease H and by means of RNA blot analysis and S1 nuclease protection assay. No differences were detected between these two mRNAs other than that about 100 nucleotides of the 5'-terminal sequence of SPTm mRNA are lacking in SPTp mRNA, and the length of the poly(A) tail is different. Southern blot analysis of rat genomic DNA showed that the SPT gene is single. Primer extension and S1 nuclease mapping analyses, using a DNA fragment of a genomic clone, revealed that the SPTm and SPTp mRNAs are transcribed from different initiation sites, about 70 nucleotides apart, in the same exon, exon 1. Ribonuclease protection assay performed with RNA hybridization probe corresponding to 5'-terminal portion of SPTm mRNA also showed that the 5'-terminal sequence of SPTp mRNA is about 70 nucleotides shorter than that of hormone-responsive SPTm mRNA. These results indicate that the different organelle distribution of SPTm and SPTp, the products of the same SPT gene, arises from transcription from different initiation sites, conferring N-terminal extension peptide, the mitochondrial targeting signal, only on the translation product of SPTm mRNA.
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Affiliation(s)
- T Oda
- Department of Biochemistry, Hamamatsu University School of Medicine, Shizuoka, Japan
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Oda T, Funai T, Ichiyama A. Generation from a single gene of two mRNAs that encode the mitochondrial and peroxisomal serine:pyruvate aminotransferase of rat liver. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(19)39143-4] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Zen A, Yamashita N, Ueda M, Asakawa Y, Yoshikawa Y, Funai T, Hashimoto T. [A case of adult Still's disease with pulmonary hypertension]. Ryumachi 1990; 30:45-52. [PMID: 2377940] [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: 12/31/2022]
Abstract
The patient was a 29-year-old woman. She was well until autumn 1983, when she presented with polyarthralgia, fever above 39 degrees C, hepatosplenomegaly, swelling of lymphnode and salmon pink rash. Laboratory tests revealed marked leucocytosis with shift to the left, elevated ESR, strong positivity of CRP and abnormal liver function tests. However, anti-nuclear antibody and RA factor were negative. She was diagnosed as adult onset Still's disease (AOSD) by characteristic clinical course and laboratory data. During her disease course these abnormal findings could be well controlled neither by nonsteroidal anti-inflammatory drugs, immunosuppressive agents nor corticosteroids. Two and half years after the first admission, she began to complain of dry cough, dyspnea on efforts. Auscultation revealed an increased pulmonic sound and systolic murmur of cardiac apex. Chest X-Rays showed enlarged main pulmonary arteries. The lung fields were normal. Pulmonary function tests gave no evidence of a significant obstructive or restrictive defect but showed the low DLco and hypoxemia. Ventilation-perfusion lung scanning failed to reveal pulmonary embolism. Finally, right heart catheterization confirmed the pulmonary precapillary hypertension. Her pulmonary hypertension has progressed rapidly, strongly suggesting poor prognosis. Her pulmonary hypertension associated with no apparent parenchymal involvement was thought to be caused by a pulmonary vascular change probably related to AOSD. This case is a first case of AOSD with pulmonary hypertension.
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Affiliation(s)
- A Zen
- Department of Collagen Disease, Osaka National Hospital
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Kume A, Ueda K, Sano S, Funai T, Kobayashi Y, Hashimoto K, Yoshikawa K. [A case of overlap syndrome of PSS, SLE and Sjögren syndrome treated by cyclosporin A: an improvement of sclerosis of the skin]. Nihon Hifuka Gakkai Zasshi 1989; 99:1191-6. [PMID: 2614988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A 26-year-old female patient complicated with PSS, SLE and Sjögren was treated by combination of medium doses of corticosteroid and cyclosporin A. On admission, she showed many abnormal laboratory findings such as increased serum gammaglobulin level, high anti-DNA antibody titer and low compliment level. This therapy improved not only these laboratory abnormalities but clinical symptoms including sclerosis of the skin and arthritis, without notable side effect due to either of these drugs for the following 10 months so far. On the other hand we haven't acknowledged the effect to internal involvement yet. Since there is no promising therapy to sclerosis of the PSS skin, it is suggested that cyclosporin A can be an effective agent for PSS and should be further evaluated.
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Ichiyama A, Oda T, Miyajima H, Funai T, Itoh T, Nishiyama K. [Serine: pyruvate aminotransferase of rat liver--organelle localization and multihormonal regulation of its synthesis]. Seikagaku 1988; 60:1253-66. [PMID: 3074982] [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: 01/04/2023]
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32
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Ikushima Y, Watanabe T, Funai T, Saotome K. [Endoscopic closure of the postoperative bronchopleural fistula]. Nihon Kyobu Geka Gakkai Zasshi 1988; 36:2521-4. [PMID: 2463320] [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: 01/01/2023]
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33
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Aoki T, Funai T, Kojima M. [Prausnitz-Küstner reaction caused by egg ingestion in atopic dermatitis]. Nihon Hifuka Gakkai Zasshi 1988; 98:981-6. [PMID: 3065538] [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: 01/04/2023]
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34
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Funai T, Serizawa Y, Seki A, Imoto M, Kikawada T, Nozue M. [A strongly suspected case of adult T-cell leukemia/lymphoma manifested as salivary gland tumor]. Nihon Jibiinkoka Gakkai Kaiho 1987; 90:1063-70. [PMID: 2889815 DOI: 10.3950/jibiinkoka.90.1063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Abstract
A high-performance liquid chromatographic method was developed for the determination of glyoxylate in the liver. Alpha-keto acids in charcoal-treated acid-extract of the liver were converted to the corresponding 2,4-dinitrophenylhydrazones and purified as the derivatives by successive extractions with ethyl acetate and sodium bicarbonate solution. The dinitrophenylhydrazones were then quantitatively converted to the corresponding substituted 2-hydroxyquinoxalines by reaction with o-phenylenediamine, followed by analysis by high-performance liquid chromatography with fluorescence detection. As a control to correct the recovery of tissue glyoxylate, an acid-extract of the liver prepared with the addition of standard glyoxylate (25-50 nmol/g wet weight of tissue) was simultaneously subjected to the analytical procedure. The maximum sensitivity of the glyoxylate measurement as 2-hydroxyquinoxaline (the quinoxaline derivative corresponding to glyoxylate) was defined as the peak area reading five times as high as the blank value obtained without sample and was approximately 10 pmol per injection. Glyoxylate in the addition compound with tris(hydroxymethyl)aminomethane was quantitatively recovered as 2-hydroxyquinoxaline. The addition compounds of glyoxylate with bisulfite and cysteine did not react with 2,4-dinitrophenylhydrazine under the conditions employed and were not detectable as glyoxylate by this method, while the adduct-forming substances added to the acid-extract of the liver did not interfere with the glyoxylate determination. No glyoxylate was detected when the liver extract had been incubated at neutral pH with a large excess of cysteine, indicating that little artificial production of glyoxylate occurred during the analytical procedure. Among 64 compounds tested for possible artificial production of glyoxylate or possible interference with the chromatographic determination of 2-hydroxyquinoxaline, p-hydroxyphenylpyruvate was the only compound which was converted to glyoxylate during the procedure. However, p-hydroxyphenylpyruvate was easily removed from the acid-extract of the tissue by charcoal treatment. The amount of glyoxylate in the liver of fasted rat was measured by the present method to be approximately 5 nmol per g of wet weight.
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Abstract
In order to establish a standard procedure for the spectrophotometric determination of urinary and plasma oxalate with oxalate oxidase (Laker, M.F., et al. (1980) Clin. Chem. 26, 827-830; Sugiura, M., et al. (1980) Clin. Chim. Acta 105, 393-399) and to define the limitations of the method, the procedures and reactions involved in the assay have been examined. Among the chromogenic hydrogen donors for peroxidase tested, a combination of 3-methyl-2-benzothiazolinone hydrazone (MBTH) and sodium N-sulfopropylaniline (HALPS) was found to be best for the oxalate determination under the conditions used. Urine contained substance(s) which were inhibitory to the measurement of hydrogen peroxide by the peroxidase-catalyzed oxidative condensation of MBTH and HALPS, but they were largely removed by charcoal treatment at pH 5.6 without significant loss of oxalate. Deproteinization of plasma was carried out by ultrafiltration through a membrane cone (Centriflo CF-25) at neutral pH. The plasma oxalate ultrafiltrability under the conditions employed was calculated to be approximately 95%. A standard assay system for oxalate in these urine and plasma samples was then set up based on a series of studies on the reactions involved in the assay. In the case of normal plasma, however, the absorbance change was very small due to the low concentration of oxalate, and in addition, pretreatment of plasma with excess oxalate decarboxylase followed by the ultrafiltration and oxalate determination did not abolish completely the oxalate oxidase-dependent absorbance increase. It was concluded that the enzymic method was useful for the assay of urinary oxalate and in detecting elevated levels of plasma oxalate such as those in hemodialysis patients but was not sensitive enough to determine accurately the normal or decreased level of oxalate in plasma. The apparent concentration of oxalate in normal human plasma was measured in this work as 3.5 +/- 0.8 microM (mean +/- S.D., n = 8), and this result was interpreted to mean that the concentration of plasma oxalate was less than approximately 3.5 microM, as estimated by the present method.
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Nishioka K, Funai T, Yokozeki H, Katayama I. Induction of hapten-specific lymphoid cell proliferation by liposome-carrying molecules from haptenated epidermal cells in contact sensitivity. J Invest Dermatol 1984; 83:96-100. [PMID: 6590648 DOI: 10.1111/1523-1747.ep12263183] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Liposomes containing the extract of trinitrophenylated (TNP) epidermal cells stimulated lymph node cells from TNCB-sensitized mice effectively. Optimal stimulation was achieved by the liposome containing 0.06 microgram of the extract of TNP epidermal cells/microgram of phospholipid at a concentration of 20 micrograms phospholipid/ml. The response was hapten-specific and macrophage-dependent. UV irradiation of the epidermal cells abolished their ability to stimulate the lymph node cells. Furthermore, the liposomes containing the extract of TNP epidermal cells treated with anti-Ia and complement failed to stimulate the lymph node cells. The liposomes recovered their reactivity when nonhaptenated Ia antigen-rich epidermal extract was added. Taken together, it is likely that haptenated molecules and Ia antigen on the liposome stimulated T-lymphocytes in the presence of macrophages.
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Funai T. [Antigen specific proliferation of lymphocyte by liposomes bearing the solubilized extracts of hapten conjugated epidermal cells in contact sensitivity]. Nihon Hifuka Gakkai Zasshi 1983; 93:601-11. [PMID: 6194320] [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: 01/18/2023]
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Aoki T, Funai T, Kojima M, Adachi J. Absorption of egg antigens by the gut observed by oral Prausnitz-Küstner (Walzer) reaction in atopic dermatitis. Acta Derm Venereol Suppl (Stockh) 1989; 144:100-4. [PMID: 2800892 DOI: 10.2340/00015555144100104] [Citation(s) in RCA: 1] [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: 01/02/2023]
Abstract
Sera from 50 children (27 boys and 23 girls, under the age of 3 years) with atopic dermatitis allergic or not to hen's egg shown by skin test or radioallergosorbent test (RAST) were passively transferred to recipients which were then challenged with injection of egg antigen (Prausnitz-Küstner (P-K) test) or with ingestion of a raw egg (oral P-K test). Thirty-one patients showed positive P-K reaction with serum titers from 2 to 8,192. Fifteen of the P-K positive cases were also positive in the oral P-K test with titers from 2 to 256. The ratio of the oral P-K titer and the P-K titer in each positive case was from 1:2 to 1:32. The results indicate that a high percentage of atopic dermatitis patients with egg allergy have IgE antibody in the serum capable of reacting with an ingested egg.
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Affiliation(s)
- T Aoki
- Department of Dermatology, Habikino Hospital, Osaka Prefecture, Japan
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