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Iguchi T, Iseda N, Hirose K, Ninomiya M, Honboh T, Maeda T, Sawada F, Tachibana YI, Akashi T, Sekiguchi N, Sadanaga N, Matsuura H. Indocyanine green fluorescence to ensure perfusion in middle segment-preserving pancreatectomy: a case report. Surg Case Rep 2021; 7:262. [PMID: 34928447 PMCID: PMC8688606 DOI: 10.1186/s40792-021-01344-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 12/04/2021] [Indexed: 12/02/2022] Open
Abstract
Background Middle segment-preserving pancreatectomy (MSPP) is an alternative to total pancreatectomy that allows for the preservation of the endocrine and exocrine functions of the pancreas. However, maintaining perfusion to the pancreatic remnant is of critical importance. We describe the first case to our knowledge in which indocyanine green (ICG) fluorescence was used to confirm perfusion to the pancreatic remnant during MSPP. Case presentation A 79-year-old man with diabetes mellitus was referred to our hospital for treatment of a pancreatic tumor. Computed tomography revealed a hypovascular mass in the uncus of the pancreas and dilatation of the main pancreatic duct, measuring 13 mm in the tail of the pancreas. He was diagnosed with cancer of the pancreatic uncus via endoscopic ultrasound and fine-needle aspiration revealed a mixed-type intraductal papillary mucinous neoplasm (IPMN), along with high-risk stigmata in the tail of the pancreas. We performed MSPP and the length of the pancreatic remnant was 4.6 cm. The dorsal pancreatic artery was preserved and perfusion to the pancreatic remnant was confirmed by ICG fluorescence. Histopathological examination showed a pancreatic ductal adenocarcinoma in the uncus (pT1cN1M0, pStage 2B) and IPMN in the tail of the pancreas. The postoperative course was complicated by a grade B pancreatic fistula, but this was successfully treated with conservative management. The patient was transferred to a hospital 33 days after surgery. Insulin administration was necessary, but C-peptide was detectable and blood glucose was relatively well-controlled. He did not exhibit any exocrine dysfunction when pancreatic enzyme supplementation was administered. Conclusion ICG fluorescence can be used to evaluate perfusion to the pancreatic remnant during MSPP.
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Affiliation(s)
- Tomohiro Iguchi
- Department of Surgery, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan.
| | - Norifumi Iseda
- Department of Surgery, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan
| | - Kosuke Hirose
- Department of Surgery, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan
| | - Mizuki Ninomiya
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higasi-ku, Fukuoka, 812-8582, Japan
| | - Takuya Honboh
- Department of Surgery, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan
| | - Takashi Maeda
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higasi-ku, Fukuoka, 812-8582, Japan
| | - Fumi Sawada
- Department of Internal Medicine, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan
| | - Yu-Ichi Tachibana
- Department of Internal Medicine, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan
| | - Tetsuro Akashi
- Department of Internal Medicine, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan
| | - Naotaka Sekiguchi
- Department of Internal Medicine, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan
| | - Noriaki Sadanaga
- Department of Surgery, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan
| | - Hiroshi Matsuura
- Department of Surgery, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan
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Nakano T, Motoshita J, Sawada F, Okabe M, Tamae A, Hiramatsu S, Kodama S, Shiratsuchi H, Yasumatsu R, Nakashima T, Nakagawa T. Syndrome of inappropriate antidiuretic hormone secretion in a case of olfactory neuroblastoma without anti-diuretic hormone immunoreactivity: A case report and review of the literature. Auris Nasus Larynx 2016; 44:771-774. [PMID: 28010942 DOI: 10.1016/j.anl.2016.11.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 11/12/2016] [Accepted: 11/28/2016] [Indexed: 11/25/2022]
Abstract
Olfactory neuroblastoma (ONB) is a relatively rare nasal or paranasal malignant tumor. This tumor is rarely accompanied by paraneoplastic syndromes such as syndrome of inappropriate antidiuretic hormone secretion (SIADH). Here, we report a 31-year-old female with histologically confirmed ONB who had been diagnosed with SIADH three years prior. She was treated with surgery followed by concurrent chemoradiotherapy. SIADH resolved immediately after surgical tumor resection. Immunohistochemically, both biopsy and resected specimens from the nasal cavity had been negative for ADH. Although extremely rare, ONB may be associated with SIADH, and the possibility of this cancer should be taken into account during the follow-up of idiopathic SIADH.
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Affiliation(s)
- Takafumi Nakano
- Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-3-1, Higashi-ku, Fukuoka 812-8582, Japan; Department of Otolaryngology, Hamanomachi Hospital, Nagahama 3-3-1, Chuo-ku, Fukuoka 810-8539, Japan.
| | - Junichi Motoshita
- Department of Pathology, Hamanomachi Hospital, Nagahama 3-3-1, Chuo-ku, Fukuoka 810-8539, Japan
| | - Fumi Sawada
- Department of Endocrine and Metabolic Diseases/Diabetes Mellitus, Hamanomachi Hospital, Nagahama 3-3-1, Chuo-ku, Fukuoka 810-8539, Japan
| | - Midori Okabe
- Department of Otolaryngology, Hamanomachi Hospital, Nagahama 3-3-1, Chuo-ku, Fukuoka 810-8539, Japan
| | - Akihiro Tamae
- Department of Otolaryngology, Hamanomachi Hospital, Nagahama 3-3-1, Chuo-ku, Fukuoka 810-8539, Japan
| | - Shinsuke Hiramatsu
- Department of Endocrine and Metabolic Diseases/Diabetes Mellitus, Hamanomachi Hospital, Nagahama 3-3-1, Chuo-ku, Fukuoka 810-8539, Japan
| | - Satoru Kodama
- Department of Otolaryngology, Graduate School of Medical Sciences, Oita University, Idaigaoka 1-1, Hazama-machi, Oita 879-5593, Japan
| | - Hideki Shiratsuchi
- Department of Otolaryngology, Hamanomachi Hospital, Nagahama 3-3-1, Chuo-ku, Fukuoka 810-8539, Japan
| | - Ryuji Yasumatsu
- Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-3-1, Higashi-ku, Fukuoka 812-8582, Japan
| | - Torahiko Nakashima
- Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-3-1, Higashi-ku, Fukuoka 812-8582, Japan
| | - Takashi Nakagawa
- Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-3-1, Higashi-ku, Fukuoka 812-8582, Japan
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Maeda Y, Inoguchi T, Takei R, Sawada F, Sasaki S, Fujii M, Kobayashi K, Urata H, Nishiyama A, Takayanagi R. Inhibition of chymase protects against diabetes-induced oxidative stress and renal dysfunction in hamsters. Am J Physiol Renal Physiol 2010; 299:F1328-38. [PMID: 20881036 DOI: 10.1152/ajprenal.00337.2010] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Accumulating evidence suggests that the intrarenal renin-angiotensin system may be involved in the progression of diabetic nephropathy. Chymase is a potent local angiotensin II-forming enzyme in several species, including humans and hamsters. However, the pathophysiological role of chymase is not fully understood. Here, we report a causal role of chymase in diabetic nephropathy and the therapeutic effectiveness of chymase inhibition. In the present study, renal chymase expression was markedly upregulated in streptozotocin-induced diabetic hamsters. Oral administration of a specific chymase inhibitor, TEI-F00806, completely ameliorated proteinuria, the overexpression of transforming growth factor-β and fibronectin in glomeruli, and renal mesangial expansion, by normalizing the increase in intrarenal angiotensin II levels in diabetic hamsters independently of blood pressure levels. In contrast, ramipril did not show such sufficient effects. These effects occurred in parallel with improvements in superoxide production and expression of NAD(P)H oxidase components [NAD(P)H oxidase 4 and p22(phox)] in glomeruli. This study showed for the first time that chymase inhibition may protect against elevated intrarenal angiotensin II levels, oxidative stress, and renal dysfunction in diabetes. These findings suggest that chymase offers a new therapeutic target for diabetic nephropathy.
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Affiliation(s)
- Yasutaka Maeda
- Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Maeda Y, Inoguchi T, Tsubouchi H, Sawada F, Sasaki S, Fujii M, Saito R, Yanase T, Shimabukuro M, Nawata H, Takayanagi R. High prevalence of peripheral arterial disease diagnosed by low ankle-brachial index in Japanese patients with diabetes: the Kyushu Prevention Study for Atherosclerosis. Diabetes Res Clin Pract 2008; 82:378-82. [PMID: 18930561 DOI: 10.1016/j.diabres.2008.09.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2007] [Revised: 07/04/2008] [Accepted: 09/01/2008] [Indexed: 11/20/2022]
Abstract
We examined the prevalence of peripheral arterial disease (PAD) in Japanese diabetic patients with ankle-brachial index (ABI). Outpatients with diabetes (n=4249) who were regularly visiting Kyushu University Hospital, its 17 related hospitals, Ryukyu University Hospital and its 6 related hospitals were enrolled in the Kyushu Prevention Study for Atherosclerosis from 2001 to 2003. At baseline, ABI was measured using a device "form PWV/ABI". Valid information was available for 3906 diabetic patients (mean age: 60.8 years) including 1612 elderly patients (>65 years). Patients with a low ABI (<0.9) on either side or on both sides were considered to have PAD. The prevalence of PAD patients with ABI<0.9 was 7.6% in all diabetic subjects. Elderly patients (>65 years) had a higher prevalence of PAD (12.7%) compared with younger patients (<65 years) (4.0%). In addition, the rate of patients who had been diagnosed accurately as having PAD before enrollment was low (24.4%). The prevalence of PAD was high in Japanese patients with diabetes, especially in elderly patients, in contrast to low rates of accurate diagnosis. Better diagnostic efforts and more intensive treatments are needed to improve quality of life and the overall prognosis of life in Japanese diabetic patients.
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Affiliation(s)
- Yasutaka Maeda
- Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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Sawada F, Inoguchi T, Tsubouchi H, Sasaki S, Fujii M, Maeda Y, Morinaga H, Nomura M, Kobayashi K, Takayanagi R. Differential effect of sulfonylureas on production of reactive oxygen species and apoptosis in cultured pancreatic beta-cell line, MIN6. Metabolism 2008; 57:1038-45. [PMID: 18640379 DOI: 10.1016/j.metabol.2008.01.038] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Accepted: 01/10/2008] [Indexed: 01/09/2023]
Abstract
Sulfonylureas are considered to cause beta-cell apoptosis. However, it is unclear how this occurs and whether there is a difference in such effects among various sulfonylureas. Here, we examined the effects of various sulfonylureas and a short-acting insulin secretagogue, nateglinide, on oxidative stress and apoptosis using the beta-cell line MIN6. After cultured MIN6 cells were exposed to various concentrations of sulfonylureas (glibenclamide, glimepiride, and gliclazide) or nateglinide, intracellular production of reactive oxygen species (ROS) was evaluated by staining with 2',7'-dichlorofluorescein diacetate. The effect of these agents on apoptosis was also evaluated by the terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate-biotin nick-end labeling technique. Exposure of beta-cells to glibenclamide, glimepiride, and nateglinide significantly increased intracellular ROS production in a concentration-dependent manner (0.1-10 micromol/L). These effects were completely blocked by nicotinamide adenine dinucleotide phosphate [NAD(P)H] oxidase inhibitors (diphenylene iodonium or apocynin) or a protein kinase C inhibitor (calphostin C). After exposure to these agents for 48 hours, the numbers of apoptotic cells were also significantly increased. These effects were significantly blocked by apocynin and antioxidant N-acetyl-L-cysteine. In contrast, exposure to any concentrations of gliclazide did not affect either intracellular ROS production or the numbers of apoptotic cells. Sulfonylureas (glibenclamide and glimepiride, but not gliclazide) and nateglinide stimulated ROS production via protein kinase C-dependent activation of NAD(P)H oxidase and consequently caused beta-cell apoptosis in vitro. Because of the lack of such adverse effects, gliclazide may have a benefit in the preservation of functional beta-cell mass.
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Affiliation(s)
- Fumi Sawada
- Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
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Kobayashi K, Inoguchi T, Maeda Y, Nakashima N, Kuwano A, Eto E, Ueno N, Sasaki S, Sawada F, Fujii M, Matoba Y, Sumiyoshi S, Kawate H, Takayanagi R. The lack of the C-terminal domain of adipose triglyceride lipase causes neutral lipid storage disease through impaired interactions with lipid droplets. J Clin Endocrinol Metab 2008; 93:2877-84. [PMID: 18445677 DOI: 10.1210/jc.2007-2247] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
CONTEXT The molecular mechanisms by which triglycerides in lipid droplets (LDs) are synthesized, stored, and degraded need to be elucidated. OBJECTIVE The objectives were to report siblings with neutral lipid storage disease with myopathy (NLSDM) with a novel mutation of adipose triglyceride lipase (ATGL) and determine whether the C-terminal part of ATGL containing the hydrophobic region plays a role in the interaction with LDs. DESIGN AND PATIENTS Skin fibroblasts and peripheral blood leukocytes were obtained from NLSDM patients. In vitro experiments were performed with fibroblasts and COS7 cells. MAIN OUTCOME MEASURES Transfection studies were used to assess the effects of various recombinant ATGL proteins on lipase activities and lipid contents. Fluorescence microscopy were used for determination of intracellular distribution of ATGL proteins. RESULTS The direct sequence of ATGL cDNA reveals that a patient is a homozygote for the 4-bp deletion, leading to a premature stop codon and causes the lack of the C terminus of the protein including the hydrophobic domain. Overexpressed control ATGL in NLSDM fibroblasts was found around the rims of LDs and caused significantly reduced cellular lipid accumulation. In contrast, NLSDM ATGL was homogeneously located in the cytoplasm despite the presence of LDs and had almost no effect on LD degradation despite its similar lipase activity. A series of C-terminal truncated ATGLs without the intact hydrophobic domain failed to localize around and degrade LDs. CONCLUSIONS These findings indicate that the domain including the hydrophobic region of ATGL was essential for association with LDs.
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Affiliation(s)
- Kunihisa Kobayashi
- Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Japan.
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Fujii M, Inoguchi T, Maeda Y, Sasaki S, Sawada F, Saito R, Kobayashi K, Sumimoto H, Takayanagi R. Pitavastatin ameliorates albuminuria and renal mesangial expansion by downregulating NOX4 in db/db mice. Kidney Int 2007; 72:473-80. [PMID: 17568784 DOI: 10.1038/sj.ki.5002366] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Recent studies have uncovered various pleiotrophic effects of 3-hydroxy-3-methylglutaryl coenzyme A reductase-inhibiting drugs (statins). Several studies have identified a beneficial effect of statins on diabetic nephropathy; however, the molecular mechanisms are unclear. In this study, we show that statin ameliorates nephropathy in db/db mice, a rodent model of type 2 diabetes, via downregulation of NAD(P)H oxidase NOX4, which is a major source of oxidative stress in the kidney. Pitavastatin treatment for 2 weeks starting at 12 weeks of age significantly reduced albuminuria in the db/db mice concomitant with a reduction of urinary 8-hydroxy-2'-deoxyguanosine and 8-epi-prostaglandin F(2alpha). Immunohistochemical analysis found increased amounts of 8-hydroxy-2'-deoxyguanosine and NOX4 protein in the kidney of db/db mice. Quantitative reverse transcription-polymerase chain reaction also showed increased levels of NOX4 mRNA. Pitavastatin normalized all of these changes in the kidneys of diabetic animals. Additionally, 12-week treatment with the statin completely normalized the levels of transforming growth factor-beta1 and fibronectin mRNA as well as the mesangial expansion characteristic of diabetic nephropathy. Our study demonstrates that pitavastatin ameliorates diabetic nephropathy in db/db mice by minimizing oxidative stress by downregulating NOX4 expression. These findings may provide insight into the mechanisms of statin therapy in early stages of diabetic nephropathy.
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Affiliation(s)
- M Fujii
- Department of Internal Medicine and Bioregulatory Science, Graduate School of Medical Science, Kyusyu University, Fukuoka, Japan
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Sawada F, Yoshimura R, Ito K, Nakamura K, Nawata H, Mizumoto K, Shimizu S, Inoue T, Yao T, Tsuneyoshi M, Kondo A, Harada N. Adult case of an omphalomesenteric cyst resected by laparoscopic-assisted surgery. World J Gastroenterol 2006; 12:825-7. [PMID: 16521206 PMCID: PMC4066143 DOI: 10.3748/wjg.v12.i5.825] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
This report describes an extremely rare adult case of an omphalomesenteric cyst resected by laparoscopic-assisted surgery. A 29-years-old Japanese man was referred and admitted to Kyushu University Hospital because of an abdominal mass and an elevated serum CEA (carcinoembryonic antigen) level (21.3 ng/mL) in August 2001. Abdominal CT and US demonstrated a cystic mass with septum and calcification. Laparoscopy showed a large mass to be attached to his abdominal wall, measuring 110 mm x 70 mm x 50 mm and filled with mucus. The mass was resected by laparoscopic-assisted surgery. The histological findings of its wall showed fibromuscular tissue, adipose tissue, calcification, and an intestinal structure. It was finally diagnosed to be an omphalomesenteric cyst.
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Affiliation(s)
- Fumi Sawada
- Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Nakayama M, Inoguchi T, Sonta T, Maeda Y, Sasaki S, Sawada F, Tsubouchi H, Sonoda N, Kobayashi K, Sumimoto H, Nawata H. Increased expression of NAD(P)H oxidase in islets of animal models of Type 2 diabetes and its improvement by an AT1 receptor antagonist. Biochem Biophys Res Commun 2005; 332:927-33. [PMID: 15922295 DOI: 10.1016/j.bbrc.2005.05.065] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2005] [Accepted: 05/10/2005] [Indexed: 11/21/2022]
Abstract
This study was undertaken to reveal the role of NAD(P)H oxidase in increased oxidative stress in islets of Type 2 diabetes. Immunostaining analysis showed that staining intensities of NAD(P)H oxidase components, gp91phox and p22phox, significantly increased in islets of animal models of Type 2 diabetes, OLETF rats (60 weeks of age) and db/db mice (14 weeks of age), compared with age-matched controls, respectively, correlating with increased levels of oxidative stress marker, 8-hydroxy-deoxyguanosine or 4-hydroxy-2-nonenal modified protein. In db/db mice, oral administration of angiotensin II Type 1 receptor antagonist valsartan (5 mg/kg) for 4 weeks significantly attenuated the increased expression of gp91phox and p22phox together with inhibition of oxidative stress and partially restored decreased insulin contents in islets. Angiotensin II-related increased expression of NAD(P)H oxidase may play an important role in increased oxidative stress in islets of Type 2 diabetes. This mechanism may be a novel therapeutic target for preventing beta-cell damage.
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Affiliation(s)
- Mieko Nakayama
- Department of Medicine and Bioregulatory Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
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Doi K, Sawada F, Toda G, Yamachika S, Seto S, Urata Y, Ihara Y, Sakata N, Taniguchi N, Kondo T, Yano K. Alteration of antioxidants during the progression of heart disease in streptozotocin-induced diabetic rats. Free Radic Res 2001; 34:251-61. [PMID: 11264900 DOI: 10.1080/10715760100300231] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Involvement of oxidative stress is implicated in the progression of complication of diabetes mellitus. With respect to heart diseases, we have studied role of oxidative stress/antioxidants using rats treated with streptozotocin to induce diabetes (DM). Hemodynamic and echocardiographic measurements showed thickening of the wall and an increase in the internal dimension of the left ventricle (LV) in DM rats at 8th week. Decrease in diastolic posterior wall velocity and rate of LV pressure change, and increase in LV end diastolic pressures also proved cardiac dysfunction. These changes were further developed in DM rats after 12 weeks. Utilizing rat hearts at 8th and 12th weeks, the following estimations were performed. There was a decrease in the activity of Mn-superoxide dismutase (SOD), suggesting abnormal mitochondrial metabolism of reactive oxygen species. The level of glutathione (GSH) decreased concomitant with a decrease in the expression of gamma-glutamylcysteine synthetase (gamma-GCS). The expression of transforming growth factor-beta1 (TGF-beta1), known as a growth factor and a suppressor of GSH synthesis, elevated in DM rat hearts. Immunohistochemical estimation showed an increase in type IV collagen in DM hearts. Collectively, it was suggested a linkage between mitochondrial damage to generate reactive oxygen species and inactivation of Mn-SOD and elevation of the expression of TGF-beta1 to lead suppression of GSH synthesis and induction of fibrous change for the consequent cardiac dysfunction in DM.
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Affiliation(s)
- K Doi
- Third Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki 852-8501, Japan
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Abstract
Two ribonucleases (RNase Phya and RNase Phyb) were purified to homogeneity on SDS-PAGE from the culture filtrate of the fungus Physarum polycephalum. The apparent molecular weights of RNases Phya and Phyb were about 20,000. The pH optima of these two RNases were around 4.5-4.75. The RNases released mononucleotides from RNA in the order of 3'-GMP, 3'-AMP, and 3'-pyrimidine nucleotides. RNase Phya and RNase Phyb have the N-terminal amino acid sequences STSFD--- and KSTSF--, respectively. This finding and the similar amino acid compositions of both RNases indicated that they might share the same protein moiety except for the N-terminus Lys. The complete primary structure of RNase Phyb was determined, mostly by analysis of the peptides generated by trypsin, V8 protease, and lysylendopeptidase digestions. The molecular weight of the protein moiety was 19,704. The locations of four half cystine residues were almost superimposable on those in five known fungal RNase T2 family RNases, but two others were not. The sequence homology between RNase Phyb and five known fungal RNases amounted to 53-59 residues, which are concentrated around the three histidine residues, supposed to form the active site in enzymes of the RNase T2 family. However, the amino acid sequence of RNase Phyb more closely resembles those of plant RNases such as RNases from Nicotiana alata [McClure, B.A. et al. (1989) Nature 342, 955-957], tomato [RNase Le, Yost et al. (1991) Eur. J. Biochem. 198, 1-6], and Momoridica charantia [RNase MC1, Ide et al. (1991) FEBS Lett. 284, 161-164].
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Affiliation(s)
- N Inokuchi
- Department of Microbiology, College of Pharmacy, Nihon University, Chiba
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Maeda R, Sawada F, Okubo Y, Onishi A, Soma C. [The public health nursing administrator as the key personnel in public health service dealing with the public]. Hokenfu Zasshi 1986; 42:822-37. [PMID: 3642030] [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: 01/06/2023]
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Sawada F. Cell cycle-dependent variations in RNA polymerase activity in the nuclear and cytoplasmic fractions of Physarum polycephalum. Cell Struct Funct 1985; 10:55-62. [PMID: 3995603 DOI: 10.1247/csf.10.55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The RNA polymerase activities of the soluble enzymes from the nuclear and cytoplasmic fractions from synchronous macroplasmodia of Physarum polycephalum were measured. Activity in the nuclear fraction prepared from cells in the G2 phase was several times higher than that at metaphase, and activity in the cytoplasmic fraction was much higher at metaphase than in the G2 phase. The amount of activity was nearly constant during the late G2 phase and early prophase, then rose abruptly just before metaphase, becoming tenfold higher at metaphase then decreasing rapidly during anaphase-telophase. The cytoplasmic activity at metaphase was attributed almost exclusively to the type II (or B) enzyme as shown by alpha-amanitin inhibition and chromatographic analysis of the enzyme. Results indicate that at metaphase RNA polymerase II molecules are loosely associated with condensed chromosomes or that they move from the mitotic nuclei into the cytoplasm.
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Sawada F, Miyauchi Y, Tanaka H, Matsumoto S. Preparation of metaphase chromatin of Physarum polycephalum without the loss of repressed RNA synthesis. Biochem Biophys Res Commun 1982; 104:657-63. [PMID: 7073706 DOI: 10.1016/0006-291x(82)90687-8] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Sawada F, Irie M. Characterization of ribonuclease A irradiated with gamma-rays in the presence of cytidylic acid with respect to the interaction of the enzyme with folic acid. J Radiat Res 1981; 22:367-372. [PMID: 6276537 DOI: 10.1269/jrr.22.367] [Citation(s) in RCA: 2] [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: 05/21/2023]
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Sawada F. Folate-sepharose column as an affinity absorbent for protein fractionation. Anal Biochem 1979; 98:184-9. [PMID: 543553 DOI: 10.1016/0003-2697(79)90724-3] [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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Torii K, Urata Y, Iitaka Y, Sawada F, Mitsui Y. Crystal structure of monoclinic ribonuclease-S at 4 A resolution. The mode of binding of 4-thiouridylic acid and a fragment of folic acid, p-aminobenzoylglutamic acid. J Biochem 1978; 83:1239-47. [PMID: 306995 DOI: 10.1093/oxfordjournals.jbchem.a132031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
A four-A electron density map was calculated for the monoclinic crystal of ribonuclease-S (RNase-S) based on two heavy-atom derivatives. Close geometrical similarity was found between the two crystallographically independent RNase-S molecules (called molecules ZA and ZB) in this crystal and that (called molecule Y) in the trigonal crystal. Using the rotational and translational parameters relating these three molecules, it was established that the crystallographic two-fold symmetry between the two molecules ZA in the monoclinic crystal was exactly identical to that between the two molecules Y in the trigonal crystal, suggesting the tendency of RNase-S molecules to associate in this way although the interaction is weak. The 4-A difference Fourier maps calculated for the monoclinic crystal established the following conclusions. (1) 4-Thiouridine-2'(3')-monophosphates binds to the B1 and R1 sites like other pyrimidine nucleoside-2'(3')-monophosphates as expected from previous spectrophotometric studies, but not to the B2 site even at the concentration of 20 mM. An attempt to visualize the photoproduct generated by irradiation of near-ultraviolet light in this complex failed. (2) p-Aminobenzoylglutamic acid, a fragment of folic acid, seems to bind to RNase-S with its benzene ring close to the B2 site and the alpha-carboxylate group close to the p1 site. The model is compatible with most of the chemical results obtained by Sawada et al. ((1977) Biochim. Biophys. Acta 479, 188-197).
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Sawada F, Samejima T, Saneyoshi M. Interaction of 6-thioguanylic acid homologues with ribonuclease T 1 . Spectrophotometric and gel filtration studies. Biochim Biophys Acta 1973; 299:596-602. [PMID: 4350630 DOI: 10.1016/0005-2787(73)90232-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Samejima T, Kita M, Saneyoshi M, Sawada F. Optical rotatory dispersion and circular dichroism of sulfur-containing nucleosides and nucleotide and of the ribonuclease-thionucleotide complex. Biochim Biophys Acta 1969; 179:1-9. [PMID: 5813844 DOI: 10.1016/0005-2787(69)90115-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Saneyoshi M, Sawada F. Synthetic nucleosides and nucleotides. VI. On the several routes for the syntheses of 4-thiouridylic acid homologues. Chem Pharm Bull (Tokyo) 1969; 17:181-90. [PMID: 5771623 DOI: 10.1248/cpb.17.181] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Sawada F, Ichimura S. [Spectrophotometric determination of the dissociation constant of ribonuclease-nucleotide complexes]. Seikagaku 1967; 39:819-22. [PMID: 5627833] [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: 01/16/2023]
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Affiliation(s)
- F Sawada
- Laboratory of Biochemistry, National Institute of Radiological Sciences, Chiba City, Japan
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