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Sakurada T, Kojima S, Yamada S, Koitabashi K, Taki Y, Matsui K, Murasawa M, Kawarazaki H, Shimizu S, Kobayashi H, Asai T, Hashimoto K, Hoshino T, Sugitani S, Maoka T, Nagase A, Sato H, Fukuoka K, Sofue T, Koibuchi K, Nagayama K, Washida N, Koide S, Okamoto T, Ishii D, Furukata S, Uchiyama K, Takahashi S, Nishizawa Y, Naito S, Toda N, Naganuma T, Kikuchi H, Suzuki T, Komukai D, Kimura T, Io H, Yoshikawa K, Naganuma T, Morishita M, Oshikawa J, Tamagaki K, Fujisawa H, Ueda A, Kanaoka T, Nakamura H, Yanagi M, Udagawa T, Yoneda T, Sakai M, Gunji M, Osaki S, Saito H, Yoshioka Y, Kaneshiro N. A multi-institutional, observational study of outcomes after catheter placement for peritoneal dialysis in Japan. Perit Dial Int 2023; 43:457-466. [PMID: 37632293 DOI: 10.1177/08968608231193240] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/27/2023] Open
Abstract
BACKGROUND This multi-institutional, observational study examined whether the outcomes after peritoneal dialysis (PD) catheter placement in Japan meet the audit criteria of the International Society for Peritoneal Dialysis (ISPD) guideline and identified factors affecting technique survival and perioperative complications. METHODS Adult patients who underwent first PD catheter placement for end-stage kidney disease between April 2019 and March 2021 were followed until PD withdrawal, kidney transplantation, transfer to other facilities, death, 1 year after PD start or March 2022, whichever came first. Primary outcomes were time to catheter patency failure and technique failure, and perioperative infectious complications within 30 days of catheter placement. Secondary outcomes were perioperative complications. Appropriate statistical analyses were performed to identify factors associated with the outcomes of interest. RESULTS Of the total 409 patients, 8 who underwent the embedded catheter technique did not have externalised catheters. Of the 401 remaining patients, catheter patency failure occurred in 25 (6.2%). Technical failure at 12 months after PD catheter placement calculated from cumulative incidence function was 15.3%. On Cox proportional hazards model analysis, serum albumin (hazard ratio (HR) 0.44; 95% confidence interval (CI) 0.27-0.70) and straight type catheter (HR 2.14; 95% CI 1.24-3.69) were the independent risk factors for technique failure. On logistic regression analysis, diabetes mellitus was the only independent risk factor for perioperative infectious complications (odds ratio 2.70, 95% CI 1.30-5.58). The occurrence rate of perioperative complications generally met the audit criteria of the ISPD guidelines. CONCLUSION PD catheter placement in Japan was proven to be safe and appropriate.
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Affiliation(s)
- Tsutomu Sakurada
- Division of Nephrology and Hypertension, Department of Internal Medicine, St Marianna University School of Medicine, Kanagawa, Japan
| | - Shigeki Kojima
- Division of Nephrology and Hypertension, Department of Internal Medicine, St Marianna University School of Medicine, Kanagawa, Japan
| | - Shohei Yamada
- Division of Nephrology and Hypertension, Department of Internal Medicine, St Marianna University School of Medicine, Kanagawa, Japan
| | | | - Yasuhiro Taki
- Department of Nephrology, Inagi Municipal Hospital, Tokyo, Japan
| | - Katsuomi Matsui
- Division of Nephrology and Hypertension, St Marianna University School of Medicine Yokohama City Seibu Hospital, Kanagawa, Japan
| | - Masaru Murasawa
- Department of Nephrology, Gyotoku General Hospital, Chiba, Japan
| | - Hiroo Kawarazaki
- Department of Internal Medicine, Teikyo University Mizonokuchi Hospital, Kanagawa, Japan
| | - Sayaka Shimizu
- Institute for Health Outcomes and Process Evaluation Research (iHope International), Kyoto University, Japan
| | - Hironori Kobayashi
- Department of Nephrology, Japanese Red Cross Asahikawa Hospital, Hokkaido, Japan
| | - Toshihiro Asai
- Department of Urology, Osaka City General Hospital, Japan
| | - Koji Hashimoto
- Department of Nephrology, Shinshu University School of Medicine, Nagano, Japan
| | - Taro Hoshino
- Department of Nephrology, Japanese Red Cross Saitama Hospital, Japan
| | - Seita Sugitani
- Department of Nephrology, Japanese Red Cross Society Wakayama Medical Center, Japan
| | - Tomochika Maoka
- Department of Nephrology, NTT Medical Center Sapporo, Hokkaido, Japan
| | - Akihiko Nagase
- Department of Nephrology and Hypertension, Dokkyo Medical University, Tochigi, Japan
| | - Hirotaka Sato
- Department of Nephrology, Shimane Prefectural Central Hospital, Japan
| | - Kosuke Fukuoka
- Department of Nephrology, Kurashiki Central Hospital, Okayama, Japan
| | - Tadashi Sofue
- Department of CardioRenal and Cerebrovascular Medicine, Faculty of Medicine, Kagawa University, Japan
| | - Kiyoto Koibuchi
- Department of Nephrology and Dialysis, Saiseikai Yokohamashi Tobu Hospital, Japan
| | | | - Naoki Washida
- Department of Nephrology, International University of Health and Welfare Narita Hospital, Chiba, Japan
| | - Shigehisa Koide
- Department of Nephrology, Fujita Health University School of Medicine, Aichi, Japan
| | - Takayuki Okamoto
- Department of Nephrology, Kyowakai Medical Corporation Kyoritsu Hospital, Hyogo, Japan
| | - Daisuke Ishii
- Department of Urology, School of Medicine, Kitasato University, Kanagawa, Japan
| | - Satoshi Furukata
- Department of Nephrology, Fukaya Red Cross Hospital, Saitama, Japan
| | - Kiyotaka Uchiyama
- Department of Nephrology, International University of Health and Welfare Narita Hospital, Chiba, Japan
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Shunsuke Takahashi
- Department of Nephrology, National Hospital Organization Kure Medical Center, Hiroshima, Japan
| | - Yoshiko Nishizawa
- Department of Nephrology, Ichiyokai Harada Hospital, Hiroshima, Japan
| | - Shotaro Naito
- Department of Nephrology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Japan
| | - Naohiro Toda
- Department of Nephrology, Kansai Electric Power Hospital, Osaka, Japan
| | - Tsukasa Naganuma
- Department of Nephrology, Yamanashi Prefectural Central Hospital, Japan
| | - Hidetoshi Kikuchi
- Department of Nephrology, National Hospital Organization Beppu Medical Center, Oita, Japan
| | - Tomo Suzuki
- Department of Nephrology, Kameda Medical Center, Chiba, Japan
| | - Daisuke Komukai
- Department of Nephrology, Kawasaki-Saiwai Hospital, Kanagawa, Japan
| | - Takahide Kimura
- Department of Nephrology, International University of Health and Welfare Atami Hospital, Shizuoka, Japan
| | - Hiroaki Io
- Department of Nephrology, Juntendo University Nerima Hospital, Tokyo, Japan
| | - Kazuhiro Yoshikawa
- Division of Nephrology and Hypertension, Department of Internal Medicine, Iwate Medical University School of Medicine, Japan
| | | | | | - Jin Oshikawa
- Department of Nephrology, Yokohama Sakae Kyosai Hospital, Kanagawa, Japan
| | - Keiichi Tamagaki
- Division of Nephrology, Department of Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Hajime Fujisawa
- Department of Nephrology, Yokohama City Minato Red Cross Hospital, Kanagawa, Japan
| | - Atsushi Ueda
- Department of Nephrology, Hitachi General Hospital, Ibaraki, Japan
| | - Tomohiko Kanaoka
- Department of Medical Science and Cardiorenal Medicine, Graduate School of Medicine, Yokohama City University, Kanagawa, Japan
| | | | - Mai Yanagi
- Department of Nephrology, Japanese Red Cross Medical Center, Tokyo, Japan
| | - Takashi Udagawa
- Department of Nephrology, Nippon Koukan Hospital, Kanagawa, Japan
| | - Tatsuo Yoneda
- Department of Urology, Nara Medical University, Japan
| | - Masashi Sakai
- Department of Nephrology, Fujisawa City Hospital, Kanagawa, Japan
| | - Masanobu Gunji
- Department of Nephrology, Mito Saiseikai General Hospital, Ibaraki, Japan
| | - Shinichi Osaki
- Department of Surgery, Gengendo Kimitsu Hospital, Chiba, Japan
| | - Hisako Saito
- Department of Nephrology, Showa General Hospital, Tokyo, Japan
| | - Yuuki Yoshioka
- Department of Nephrology, Tachikawa General Hospital, Niigata, Japan
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Hidaka S, Ohtake T, Oka M, Ozawa K, Tamura T, Shibata K, Nishihara M, Kuji T, Oshikawa J, Satta H, Imoto K, Kunieda T, Kobayashi S. FP742MILD COGNITIVE IMPAIRMENT IS ASSOCIATED WITH SARCOPENIA IN HEMODIALYSIS PATIENTS. Nephrol Dial Transplant 2019. [DOI: 10.1093/ndt/gfz106.fp742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Sumi Hidaka
- Shonan Kamakura General Hospital, Kamakura, Japan
| | | | - Machiko Oka
- Shonan Fujisawa Tokushukai Hospital, Fujisawa, Japan
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Tamura K, Yutoh J, Matsushita K, Sakai M, Oshikawa J. [Hypertension with chronic kidney disease: anti-hypertensive therapy recommended for the management of hypertension with CKD in JSN-CKD GL 2013 and JSH2014]. Nihon Rinsho 2015; 73:1876-1884. [PMID: 26619662] [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: 06/05/2023]
Abstract
For clinical practice guidelines for the management of hypertension with CKD, the Japanese Society of Nephrology (JSN) and the Japanese Society of Hypertension (JSH) evaluated recently published evidence in corporation with each other. After considerable and careful discussion, both JSN and JSH revised their respective guidelines [the Evidence-based Clinical Practice Guideline for CKD 2013 (JSN-CKD GL 2013) and JSH2014]. This section will mainly introduce anti-hypertensive therapy recommended for the management of hypertension with CKD in both guidelines. Recommendation statements for the Management of Hypertension with CKD are as follows: 1) Anti-hypertensive therapy in CKD is strongly recommended to inhibit or prevent the progression of renal dysfunction and to prevent the occurrence or recurrence of CVD by reducing blood pressure (BP) (Grade A). 2) In all diabetic CKD, the target level of clinic BP is recommended as < 130/80 mmHg, irrespective of the presence or absence of albuminuria/proteinuria (Grade B). 3) In all non-diabetic CKD, the target level of clinic BP is strongly recommended as consistently < 140/90 mmHg, irrespective of the presence or absence of albuminuria/proteinuria (Grade A). 4) In non-diabetic CKD with A2 and A3 categories, the target level of clinic BP can be set as < 130/80 mmHg (Grade C1). 5) In diabetic CKD with A1 category, ARBs and ACE inhibitors are suggested as first-line anti-hypertensive drugs(Grade C1). 6) In diabetic CKD with A2 and A3 categories, ARBs and ACE inhibitors are recommended as first-line anti-hypertensive drugs (Grade A). 7) In non-diabetic CKD with A1 category, ARBs, ACE inhibitors, calcium channel blockers (CCBs) and diuretics are recommended as first-line anti-hypertensive drugs (Grade B). 8) In non-diabetic CKD with A2 and A3 categories, ARBs and ACE inhibitors are recommended as first-line anti-hypertensive drugs (Grade B).
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Azushima K, Tamura K, Haku S, Wakui H, Kanaoka T, Ohsawa M, Uneda K, Kobayashi R, Ohki K, Dejima T, Maeda A, Hashimoto T, Oshikawa J, Kobayashi Y, Nomura K, Azushima C, Takeshita Y, Fujino R, Uchida K, Shibuya K, Ando D, Tokita Y, Fujikawa T, Toya Y, Umemura S. Effects of the oriental herbal medicine Bofu-tsusho-san in obesity hypertension: A multicenter, randomized, parallel-group controlled trial (ATH-D-14-01021.R2). Atherosclerosis 2015; 240:297-304. [DOI: 10.1016/j.atherosclerosis.2015.01.025] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 01/10/2015] [Accepted: 01/16/2015] [Indexed: 12/20/2022]
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Wakui H, Hosokawa Y, Oshikawa J, Tamura K, Toya Y, Yabana M, Furihata S, Sugano T, Umemura S. Endovascular treatment of renal artery stenosis improves contralateral renal hypertrophy with nephrotic syndrome. CEN Case Rep 2014; 3:53-55. [PMID: 28509242 DOI: 10.1007/s13730-013-0085-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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: 04/13/2013] [Accepted: 05/29/2013] [Indexed: 11/24/2022] Open
Abstract
Nephrotic syndrome due to renovascular hypertension is uncommon. We herein report a case of nephrotic syndrome associated with unilateral atherosclerotic renal artery stenosis. A 76-year-old woman who had been taking antihypertensive medication for more than 15 years was referred to our hospital for treatment of uncontrolled hypertension and massive proteinuria in the nephrotic range. An abdominal bruit was heard, and laboratory findings showed high plasma renin activity and hypokalemia. Renal computed tomography angiography showed severe stenosis of the ostium of the right renal artery and an atrophic right kidney. The left renal artery was normal and the left kidney was compensatorily enlarged. After admission, we started treatment with an angiotensin II receptor blocker and subsequently performed percutaneous transluminal renal angioplasty with renal artery stent placement. As a result, her blood pressure became well controlled and the massive proteinuria disappeared. In addition, her stenotic-side renal atrophy was resolved, concomitant with an improvement in her renal function. The contralateral renal hypertrophy was also resolved.
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Affiliation(s)
- Hiromichi Wakui
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan.
| | - Yuki Hosokawa
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Jin Oshikawa
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Kouichi Tamura
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Yoshiyuki Toya
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Machiko Yabana
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Shuta Furihata
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Teruyasu Sugano
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Satoshi Umemura
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
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Sudhahar V, Urao N, Oshikawa J, McKinney RD, Llanos RM, Mercer JF, Ushio-Fukai M, Fukai T. Copper transporter ATP7A protects against endothelial dysfunction in type 1 diabetic mice by regulating extracellular superoxide dismutase. Diabetes 2013; 62:3839-50. [PMID: 23884884 PMCID: PMC3806617 DOI: 10.2337/db12-1228] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Oxidative stress and endothelial dysfunction contribute to vascular complication in diabetes. Extracellular superoxide dismutase (SOD3) is one of the key antioxidant enzymes that obtains copper via copper transporter ATP7A. SOD3 is secreted from vascular smooth muscles cells (VSMCs) and anchors at the endothelial surface. The role of SOD3 and ATP7A in endothelial dysfunction in type 1 diabetes mellitus (T1DM) is entirely unknown. Here we show that the specific activity of SOD3, but not SOD1, is decreased, which is associated with increased O2(•-) production in aortas of streptozotocin-induced and genetically induced Ins2(Akita) T1DM mice. Exogenous copper partially rescued SOD3 activity in isolated T1DM vessels. Functionally, acetylcholine-induced, endothelium-dependent relaxation is impaired in T1DM mesenteric arteries, which is rescued by SOD mimetic tempol or gene transfer of SOD3. Mechanistically, ATP7A expression in T1DM vessels is dramatically decreased whereas other copper transport proteins are not altered. T1DM-induced endothelial dysfunction and decrease of SOD3 activity are rescued in transgenic mice overexpressing ATP7A. Furthermore, SOD3-deficient T1DM mice or ATP7A mutant T1DM mice augment endothelial dysfunction and vascular O2(•-) production versus T1DM mice. These effects are in part due to hypoinsulinemia in T1DM mice, since insulin treatment, but not high glucose, increases ATP7A expression in VSMCs and restores SOD3 activity in the organoid culture of T1DM vessels. In summary, a decrease in ATP7A protein expression contributes to impaired SOD3 activity, resulting in O2(•-) overproduction and endothelial dysfunction in blood vessels of T1DM. Thus, restoring copper transporter function is an essential therapeutic approach for oxidant stress-dependent vascular and metabolic diseases.
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Affiliation(s)
- Varadarajan Sudhahar
- Section of Cardiology, Department of Medicine, and Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois
| | - Norifumi Urao
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois
- Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois
| | - Jin Oshikawa
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois
- Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois
| | - Ronald D. McKinney
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois
- Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois
- Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois
| | - Roxana M. Llanos
- Centre for Cellular and Molecular Biology, School of Life and Environmental Sciences, Deakin University, Burwood, Australia
| | - Julian F.B. Mercer
- Centre for Cellular and Molecular Biology, School of Life and Environmental Sciences, Deakin University, Burwood, Australia
| | - Masuko Ushio-Fukai
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois
- Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois
| | - Tohru Fukai
- Section of Cardiology, Department of Medicine, and Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois
- Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois
- Corresponding author: Tohru Fukai,
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Oshikawa J, Toya Y, Morita S, Taguri M, Hanaoka K, Hasegawa T, Kaizu K, Kamata K, Kobayashi S, Ohtake T, Sato T, Yasuda G, Kimura K, Umemura S. Angiotensin receptor blocker (ARB)-diuretic versus ARB-calcium channel blocker combination therapy for hypertension uncontrolled by ARB monotherapy. Clin Exp Hypertens 2013; 36:244-50. [PMID: 23848219 DOI: 10.3109/10641963.2013.810227] [Citation(s) in RCA: 10] [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] [Indexed: 11/13/2022]
Abstract
Diuretics or calcium channel blockers (CCBs) are used concomitantly with an angiotensin II receptor blocker (ARB). However, it is not established which ARB-based combination therapy is the most effective and safe. This prospective randomized open-label study compared the efficacy and safety of a fixed-dose tablet of losartan (LST)-hydrochlorothiazide (HCTZ) (n = 99) and LST-amlodipine (AML) (n = 77) in Japanese patients whose hypertension was uncontrolled by ARB monotherapy. Blood pressure changed similarly over the 12-month study period. Only LST-HCTZ significantly increased serum uric acid (SUA) in patients with low baseline SUA (<5.6 mg/dL) but not in patients with high baseline SUA.
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Affiliation(s)
- Jin Oshikawa
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine , Yokohama , Japan
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Ishiguro H, Hashimoto T, Akata M, Suzuki S, Azushima K, Kobayashi Y, Kanaoka T, Yoshida S, Wakui H, Oshikawa J, Nagahama K, Inayama Y, Tamura K, Toya Y, Umemura S. Rituximab treatment for adult purpura nephritis with nephrotic syndrome. Intern Med 2013; 52:1079-83. [PMID: 23676594 DOI: 10.2169/internalmedicine.52.9325] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The case of a 68-year-old woman with purpura nephritis associated with nephrotic syndrome is herein described. The patient's clinical course and the findings of a renal biopsy study revealed purpura nephritis. Following treatment with corticosteroids and intravenous cyclophosphamide accompanied by an angiotensin II type I receptor-blocker, an anti-platelet drug and an hydroxymethylglutaryl (HMG)-CoA, the proteinuria mildly decreased. Additional rituximab therapy led to a complete remission. This report describes our successful experience using rituximab to treat refractory nephrotic syndrome of purpura nephritis. Further studies are required to confirm the efficacy of rituximab as an alternative therapy for nephrotic syndrome.
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Affiliation(s)
- Hiroaki Ishiguro
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University School of Medicine, Japan
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Kanaoka T, Tamura K, Ohsawa M, Wakui H, Maeda A, Dejima T, Azushima K, Haku S, Mitsuhashi H, Yanagi M, Oshikawa J, Uneda K, Aoki K, Fujikawa T, Toya Y, Uchino K, Umemura S. Effects of Aliskiren-Based Therapy on Ambulatory Blood Pressure Profile, Central Hemodynamics, and Arterial Stiffness in Nondiabetic Mild to Moderate Hypertensive Patients. J Clin Hypertens (Greenwich) 2012; 14:522-9. [DOI: 10.1111/j.1751-7176.2012.00640.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Varadarajan S, Urao N, Oshikawa J, Llanos RM, Mckinney RD, Ushio-Fukai M, Fukai T. Novel Role of the ATP7A Copper‐transporting ATPase and Extracellular SOD in Endothelial Dysfunction in Type I Diabetes Mellitus. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.1057.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 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]
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Ichikawa Y, Yokoyama U, Iwamoto M, Oshikawa J, Okumura S, Sato M, Yokota S, Masuda M, Asou T, Ishikawa Y. Inhibition of Phosphodiesterase Type 3 Dilates the Rat Ductus Arteriosus Without Inducing Intimal Thickening. Circ J 2012; 76:2456-64. [DOI: 10.1253/circj.cj-12-0215] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yasuhiro Ichikawa
- Cardiovascular Research Institute, Yokohama City University
- Department of Pediatrics, Yokohama City University
| | - Utako Yokoyama
- Cardiovascular Research Institute, Yokohama City University
| | - Mari Iwamoto
- Department of Pediatrics, Yokohama City University
| | - Jin Oshikawa
- Medical Science and Cardiorenal Medicine, Yokohama City University
| | | | - Motohiko Sato
- Cardiovascular Research Institute, Yokohama City University
| | | | | | - Toshihide Asou
- Department of Cardiovascular Surgery, Kanagawa Children’s Medical Center
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Oshikawa J, Kim SJ, Furuta E, Caliceti C, Chen GF, McKinney RD, Kuhr F, Levitan I, Fukai T, Ushio-Fukai M. Novel role of p66Shc in ROS-dependent VEGF signaling and angiogenesis in endothelial cells. Am J Physiol Heart Circ Physiol 2011; 302:H724-32. [PMID: 22101521 DOI: 10.1152/ajpheart.00739.2011] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
p66Shc, a longevity adaptor protein, is demonstrated as a key regulator of reactive oxygen species (ROS) metabolism involved in aging and cardiovascular diseases. Vascular endothelial growth factor (VEGF) stimulates endothelial cell (EC) migration and proliferation primarily through the VEGF receptor-2 (VEGFR2). We have shown that ROS derived from Rac1-dependent NADPH oxidase are involved in VEGFR2 autophosphorylation and angiogenic-related responses in ECs. However, a role of p66Shc in VEGF signaling and physiological responses in ECs is unknown. Here we show that VEGF promotes p66Shc phosphorylation at Ser36 through the JNK/ERK or PKC pathway as well as Rac1 binding to a nonphosphorylated form of p66Shc in ECs. Depletion of endogenous p66Shc with short interfering RNA inhibits VEGF-induced Rac1 activity and ROS production. Fractionation of caveolin-enriched lipid raft demonstrates that p66Shc plays a critical role in VEGFR2 phosphorylation in caveolae/lipid rafts as well as downstream p38MAP kinase activation. This in turn stimulates VEGF-induced EC migration, proliferation, and capillary-like tube formation. These studies uncover a novel role of p66Shc as a positive regulator for ROS-dependent VEGFR2 signaling linked to angiogenesis in ECs and suggest p66Shc as a potential therapeutic target for various angiogenesis-dependent diseases.
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Affiliation(s)
- Jin Oshikawa
- Department of Pharmacology, Center for Lung and Vascular Biology, University of Illinois, Chicago, IL 60612, USA
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Urao N, Razvi M, Oshikawa J, McKinney RD, Chavda R, Bahou WF, Fukai T, Ushio-Fukai M. IQGAP1 is involved in post-ischemic neovascularization by regulating angiogenesis and macrophage infiltration. PLoS One 2010; 5:e13440. [PMID: 20976168 PMCID: PMC2955540 DOI: 10.1371/journal.pone.0013440] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2010] [Accepted: 09/24/2010] [Indexed: 11/18/2022] Open
Abstract
Background Neovascularization is an important repair mechanism in response to ischemic injury and is dependent on inflammation, angiogenesis and reactive oxygen species (ROS). IQGAP1, an actin-binding scaffold protein, is a key regulator for actin cytoskeleton and motility. We previously demonstrated that IQGAP1 mediates vascular endothelial growth factor (VEGF)-induced ROS production and migration of cultured endothelial cells (ECs); however, its role in post-ischemic neovascularization is unknown. Methodology/Principal Findings Ischemia was induced by left femoral artery ligation, which resulted in increased IQGAP1 expression in Mac3+ macrophages and CD31+ capillary-like ECs in ischemic legs. Mice lacking IQGAP1 exhibited a significant reduction in the post-ischemic neovascularization as evaluated by laser Doppler blood flow, capillary density and α-actin positive arterioles. Furthermore, IQGAP1−/− mice showed a decrease in macrophage infiltration and ROS production in ischemic muscles, leading to impaired muscle regeneration and increased necrosis and fibrosis. The numbers of bone marrow (BM)-derived cells in the peripheral blood were not affected in these knockout mice. BM transplantation revealed that IQGAP1 expressed in both BM-derived cells and tissue resident cells, such as ECs, is required for post-ischemic neovascularization. Moreover, thioglycollate-induced peritoneal macrophage recruitment and ROS production were inhibited in IQGAP1−/− mice. In vitro, IQGAP1−/− BM-derived macrophages showed inhibition of migration and adhesion capacity, which may explain the defective macrophage recruitment into the ischemic tissue in IQGAP1−/− mice. Conclusions/Significance IQGAP1 plays a key role in post-ischemic neovascularization by regulating, not only, ECs-mediated angiogenesis but also macrophage infiltration as well as ROS production. Thus, IQGAP1 is a potential therapeutic target for inflammation- and angiogenesis-dependent ischemic cardiovascular diseases.
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Affiliation(s)
- Norifumi Urao
- Department of Pharmacology, Center for Lung and Vascular Biology, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Masooma Razvi
- Department of Pharmacology, Center for Lung and Vascular Biology, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Jin Oshikawa
- Department of Pharmacology, Center for Lung and Vascular Biology, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Ronald D. McKinney
- Department of Pharmacology, Center for Lung and Vascular Biology, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Rupal Chavda
- Department of Pharmacology, Center for Lung and Vascular Biology, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Wadie F. Bahou
- Department of Medicine, State University of New York at Stony Brook, Stony Brook, New York, United States of America
| | - Tohru Fukai
- Departments of Medicine and Pharmacology, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Masuko Ushio-Fukai
- Department of Pharmacology, Center for Lung and Vascular Biology, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
- * E-mail:
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14
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Ashino T, Sudhahar V, Urao N, Oshikawa J, Chen GF, Wang H, Huo Y, Finney L, Vogt S, McKinney RD, Maryon EB, Kaplan JH, Ushio-Fukai M, Fukai T. Unexpected role of the copper transporter ATP7A in PDGF-induced vascular smooth muscle cell migration. Circ Res 2010; 107:787-99. [PMID: 20671235 DOI: 10.1161/circresaha.110.225334] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
RATIONALE Copper, an essential nutrient, has been implicated in vascular remodeling and atherosclerosis with unknown mechanism. Bioavailability of intracellular copper is regulated not only by the copper importer CTR1 (copper transporter 1) but also by the copper exporter ATP7A (Menkes ATPase), whose function is achieved through copper-dependent translocation from trans-Golgi network (TGN). Platelet-derived growth factor (PDGF) promotes vascular smooth muscle cell (VSMC) migration, a key component of neointimal formation. OBJECTIVE To determine the role of copper transporter ATP7A in PDGF-induced VSMC migration. METHODS AND RESULTS Depletion of ATP7A inhibited VSMC migration in response to PDGF or wound scratch in a CTR1/copper-dependent manner. PDGF stimulation promoted ATP7A translocation from the TGN to lipid rafts, which localized at the leading edge, where it colocalized with PDGF receptor and Rac1, in migrating VSMCs. Mechanistically, ATP7A small interfering RNA or CTR small interfering RNA prevented PDGF-induced Rac1 translocation to the leading edge, thereby inhibiting lamellipodia formation. In addition, ATP7A depletion prevented a PDGF-induced decrease in copper level and secretory copper enzyme precursor prolysyl oxidase (Pro-LOX) in lipid raft fraction, as well as PDGF-induced increase in LOX activity. In vivo, ATP7A expression was markedly increased and copper accumulation was observed by synchrotron-based x-ray fluorescence microscopy at neointimal VSMCs in wire injury model. CONCLUSIONS These findings suggest that ATP7A plays an important role in copper-dependent PDGF-stimulated VSMC migration via recruiting Rac1 to lipid rafts at the leading edge, as well as regulating LOX activity. This may contribute to neointimal formation after vascular injury. Our findings provide insight into ATP7A as a novel therapeutic target for vascular remodeling and atherosclerosis.
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Affiliation(s)
- Takashi Ashino
- Department of Medicine, Section of Cardiology, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, IL 60612, USA
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15
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Oshikawa J, Urao N, Kim HW, Kaplan N, Razvi M, McKinney R, Poole LB, Fukai T, Ushio-Fukai M. Extracellular SOD-derived H2O2 promotes VEGF signaling in caveolae/lipid rafts and post-ischemic angiogenesis in mice. PLoS One 2010; 5:e10189. [PMID: 20422004 PMCID: PMC2858087 DOI: 10.1371/journal.pone.0010189] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2010] [Accepted: 03/25/2010] [Indexed: 12/23/2022] Open
Abstract
Reactive oxygen species (ROS), in particular, H(2)O(2), is essential for full activation of VEGF receptor2 (VEGFR2) signaling involved in endothelial cell (EC) proliferation and migration. Extracellular superoxide dismutase (ecSOD) is a major secreted extracellular enzyme that catalyzes the dismutation of superoxide to H(2)O(2), and anchors to EC surface through heparin-binding domain (HBD). Mice lacking ecSOD show impaired postnatal angiogenesis. However, it is unknown whether ecSOD-derived H(2)O(2) regulates VEGF signaling. Here we show that gene transfer of ecSOD, but not ecSOD lacking HBD (ecSOD-DeltaHBD), increases H(2)O(2) levels in adductor muscle of mice, and promotes angiogenesis after hindlimb ischemia. Mice lacking ecSOD show reduction of H(2)O(2) in non-ischemic and ischemic limbs. In vitro, overexpression of ecSOD, but not ecSOD-DeltaHBD, in cultured medium in ECs enhances VEGF-induced tyrosine phosphorylation of VEGFR2 (VEGFR2-pY), which is prevented by short-term pretreatment with catalase that scavenges extracellular H(2)O(2). Either exogenous H(2)O(2) (<500 microM), which is diffusible, or nitric oxide donor has no effect on VEGF-induced VEGFR2-pY. These suggest that ecSOD binding to ECs via HBD is required for localized generation of extracellular H(2)O(2) to regulate VEGFR2-pY. Mechanistically, VEGF-induced VEGFR2-pY in caveolae/lipid rafts, but non-lipid rafts, is enhanced by ecSOD, which localizes at lipid rafts via HBD. One of the targets of ROS is protein tyrosine phosphatases (PTPs). ecSOD induces oxidation and inactivation of both PTP1B and DEP1, which negatively regulates VEGFR2-pY, in caveolae/lipid rafts, but not non-lipid rafts. Disruption of caveolae/lipid rafts, or PTPs inhibitor orthovanadate, or siRNAs for PTP1B and DEP1 enhances VEGF-induced VEGFR2-pY, which prevents ecSOD-induced effect. Functionally, ecSOD promotes VEGF-stimulated EC migration and proliferation. In summary, extracellular H(2)O(2) generated by ecSOD localized at caveolae/lipid rafts via HBD promotes VEGFR2 signaling via oxidative inactivation of PTPs in these microdomains. Thus, ecSOD is a potential therapeutic target for angiogenesis-dependent cardiovascular diseases.
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Affiliation(s)
- Jin Oshikawa
- Center for Lung and Vascular Biology, Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Norifumi Urao
- Center for Lung and Vascular Biology, Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Ha Won Kim
- Department of Medicine and Pharmacology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Nihal Kaplan
- Center for Lung and Vascular Biology, Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Masooma Razvi
- Center for Lung and Vascular Biology, Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Ronald McKinney
- Center for Lung and Vascular Biology, Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Department of Medicine and Pharmacology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Leslie B. Poole
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina, United States of America
| | - Tohru Fukai
- Department of Medicine and Pharmacology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Masuko Ushio-Fukai
- Center for Lung and Vascular Biology, Department of Pharmacology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois, United States of America
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16
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Otsu K, Toya Y, Oshikawa J, Kurotani R, Yazawa T, Sato M, Yokoyama U, Umemura S, Minamisawa S, Okumura S, Ishikawa Y. Caveolin gene transfer improves glucose metabolism in diabetic mice. Am J Physiol Cell Physiol 2009; 298:C450-6. [PMID: 19923424 DOI: 10.1152/ajpcell.00077.2009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [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]
Abstract
Caveolin, a member of the membrane-anchoring protein family, accumulates various growth receptors in caveolae and inhibits their function. Upregulation of caveolin attenuates cellular proliferation and growth. However, the role of caveolin in regulating insulin signals remains controversial. Here, we demonstrate that caveolin potently enhances insulin receptor (IR) signaling when overexpressed in the liver in vivo. Adenovirus-mediated gene transfer was used to overexpress caveolin specifically in the liver of diabetic obese mice, which were generated with a high-fat diet. Expression of molecules involved in IR signaling, such as IR or Akt, remained unchanged after gene transfer. However, hepatic glycogen synthesis was markedly increased with a decrease in phosphoenolpyruvate carboxykinase protein expression. Insulin sensitivity was increased after caveolin gene transfer as determined by decreased blood glucose levels in response to insulin injection and fasting blood glucose levels. Glucose tolerant test performance was also improved. Similar improvements were obtained in KKA(y) genetically diabetic mice. Adenovirus-mediated overexpression of caveolin-3 in hepatic cells also enhanced IR signaling, as shown by increased phosphorylation of IR in response to insulin stimulation and higher glycogen synthesis at baseline. These effects were attributed mostly to increased insulin receptor activity and caveolin-mediated, direct inhibition of protein tyrosine phosphatase 1B, which was increased in obese mouse livers. In conclusion, our results suggest that caveolin is an important regulator of glucose metabolism that can enhance insulin signals.
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Affiliation(s)
- Koji Otsu
- Cardiovascular Research Institute, Yokohama City University Graduate School of Medicine 3-9 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan
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17
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Ozawa M, Tamura K, Okano Y, Matsushita K, Yanagi M, Tsurumi-Ikeya Y, Oshikawa J, Hashimoto T, Masuda S, Wakui H, Shigenaga AI, Azuma K, Ishigami T, Toya Y, Ishikawa T, Umemura S. Identification of an Increased Short-Term Blood Pressure Variability on Ambulatory Blood Pressure Monitoring as a Coronary Risk Factor in Diabetic Hypertensives. Clin Exp Hypertens 2009; 31:259-70. [DOI: 10.1080/10641960902822518] [Citation(s) in RCA: 31] [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: 10/20/2022]
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18
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Hashimoto T, Toya Y, Kihara M, Yabana M, Inayama Y, Tanaka KI, Iwatsubo K, Yanagi M, Oshikawa J, Kokuho T, Kuji T, Yoshida SI, Tamura K, Umemura S. Behçet's disease complicated by IgA nephropathy with nephrotic syndrome. Clin Exp Nephrol 2008; 12:224-7. [PMID: 18224274 DOI: 10.1007/s10157-008-0029-6] [Citation(s) in RCA: 5] [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: 07/09/2007] [Accepted: 12/09/2007] [Indexed: 01/05/2023]
Abstract
A 65-year-old woman with a 48-year history of Behçet's disease associated with nephrotic syndrome is described. Immunofluorescence study revealed IgA nephropathy. Following treatment with an angiotensin II type-I receptor-blocker, an anti-platelet drug, and an HMG-CoA reductase inhibitor, accompanied by dietary restrictions of protein and sodium, proteinuria was markedly decreased. This report describes our experience with a rare entity of Behçet's disease complicated by nephrotic syndrome due to IgA nephropathy. Routine urine examination and renal biopsy are needed for the detection and diagnosis of renal problems with Behçet's disease.
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Affiliation(s)
- Tatsuo Hashimoto
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama 236-0004, Japan.
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19
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Fujita T, Otsu K, Oshikawa J, Hori H, Kitamura H, Ito T, Umemura S, Minamisawa S, Ishikawa Y. Caveolin-3 inhibits growth signal in cardiac myoblasts in a Ca2+-dependent manner. J Cell Mol Med 2006; 10:216-24. [PMID: 16563233 PMCID: PMC3933113 DOI: 10.1111/j.1582-4934.2006.tb00302.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2006] [Accepted: 02/01/2006] [Indexed: 01/19/2023] Open
Abstract
Caveolin, a major protein component of caveolae, directly interacts with multiple signaling molecules, such as Ras and growth factor receptors, and inhibits their function. However, the role of the second messenger system in mediating this inhibition by caveolin remains poorly understood. We examined the role of Ca2+-dependent signal in caveolin- mediated growth inhibition using a rat cardiac myoblast cell line (H9C2), in which the expression of caveolin- 3, the muscle specific subtype, can be induced using the LacSwitch system. Upon induction with IPTG and serum-starvation, the expression of caveolin-3 was increased by 3.3-fold relative to that of mock-induced cells. The recombinant caveolin-3 was localized to the same subcellular fraction as endogenous caveolin-3 after sucrose gradient purification. Angiotensin II enhanced ERK phosphorylation, but this enhancement was significantly decreased in caveolin-3-induced cells in comparison to that in mock-induced cells. Similarly, when cells were stimulated with fetal calf serum, DNA synthesis, as determined by [3H]-thymidine incorporation, was significantly decreased in caveolin- 3-induced cells. When cells were treated with Ca2+ chelator (BAPTA and EGTA), however, this attenuation was blunted. Calphostin (PKC inhibitor), but not cyclosporine A treatment (calcineurin inhibitor), blunted this attenuation in caveolin-3 induced cells. Our findings suggest that caveolin exhibits growth inhibition in a Ca2+-dependent manner, most likely through PKC, in cardiac myoblasts.
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Affiliation(s)
- Takayuki Fujita
- Cardiovascular Research Institute, Department of Pathology and Department of Medicine, Yokohama City University Graduate School of Medical ScienceYokohama, Japan
| | - Kouji Otsu
- Cardiovascular Research Institute, Department of Pathology and Department of Medicine, Yokohama City University Graduate School of Medical ScienceYokohama, Japan
| | - Jin Oshikawa
- Cardiovascular Research Institute, Department of Pathology and Department of Medicine, Yokohama City University Graduate School of Medical ScienceYokohama, Japan
| | - Hideaki Hori
- Cardiovascular Research Institute, Department of Pathology and Department of Medicine, Yokohama City University Graduate School of Medical ScienceYokohama, Japan
| | - Hitoshi Kitamura
- Cardiovascular Research Institute, Department of Pathology and Department of Medicine, Yokohama City University Graduate School of Medical ScienceYokohama, Japan
| | - Takaaki Ito
- Cardiovascular Research Institute, Department of Pathology and Department of Medicine, Yokohama City University Graduate School of Medical ScienceYokohama, Japan
| | - Satoshi Umemura
- Cardiovascular Research Institute, Department of Pathology and Department of Medicine, Yokohama City University Graduate School of Medical ScienceYokohama, Japan
| | - Susumu Minamisawa
- Cardiovascular Research Institute, Department of Pathology and Department of Medicine, Yokohama City University Graduate School of Medical ScienceYokohama, Japan
| | - Yoshihiro Ishikawa
- Cardiovascular Research Institute, Department of Pathology and Department of Medicine, Yokohama City University Graduate School of Medical ScienceYokohama, Japan
- Cardiovascular Research Institute, Department of Cell Biology & Molecular Medicine and Medicine (Cardiology), New Jersey Medical SchoolNewark, NJ, USA
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20
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Abstract
Caveolae, discovered by electron microscope in the 1950s, are membrane invaginations that accommodate various molecules that are involved in cellular signaling. Caveolin, a major protein component of caveolae identified in 1990s, has been known to inhibit the function of multiple caveolar proteins, such as kinases, which are involved in cell growth and proliferation, and thus considered to be a general growth signal inhibitor. Recent studies using transgenic mouse models have suggested that insulin signal may be exempted from this inhibition, which rather requires the presence of caveolin for proper signaling. Caveolin may stabilize insulin receptor protein or directly stimulate insulin receptors. Other studies have demonstrated that caveolae provide the TC10 complex with cellular microdomains for glucose transportation through Glut4. These findings suggest that caveolin plays an important role in insulin signal to maintain glucose metabolism in intact animals. However, the role of caveolin in insulin signal may differ from that in other transmembrane receptor signals.
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Affiliation(s)
- Yoshihiro Ishikawa
- Department of Physiology, Yokohama City University School of Medicine, 3-9 Fukuura Kanazawa, Yokohama 236-0004, Japan
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21
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Minamisawa S, Oshikawa J, Takeshima H, Hoshijima M, Wang Y, Chien KR, Ishikawa Y, Matsuoka R. Junctophilin type 2 is associated with caveolin-3 and is down-regulated in the hypertrophic and dilated cardiomyopathies. Biochem Biophys Res Commun 2005; 325:852-6. [PMID: 15541368 DOI: 10.1016/j.bbrc.2004.10.107] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2004] [Indexed: 11/27/2022]
Abstract
Functional coupling between the sarcolemmal membrane and the sarcoplasmic reticulum is based on distinct structures called junctional membrane complexes (JMCs). Recently, junctophilins are found to be responsible for normal formation of JMCs. In the present study, we found that junctophilin type 2 (JP-2), a unique isoform in the heart, was localized in caveolin-rich membranes, and that the expression of JP-2 was up-regulated during normal development and down-regulated in a hypertrophic or a dilated cardiomyopathic mouse model. The expression levels of JP-2 may be associated with the development of T-tubules and impaired Ca(2+)-induced Ca(2+) release in the heart.
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Affiliation(s)
- Susumu Minamisawa
- Department of Physiology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan.
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22
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Oshikawa J, Otsu K, Toya Y, Tsunematsu T, Hankins R, Kawabe JI, Minamisawa S, Umemura S, Hagiwara Y, Ishikawa Y. Insulin resistance in skeletal muscles of caveolin-3-null mice. Proc Natl Acad Sci U S A 2004; 101:12670-5. [PMID: 15314230 PMCID: PMC515114 DOI: 10.1073/pnas.0402053101] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [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: 12/25/2022] Open
Abstract
Type 2 diabetes is preceded by the development of insulin resistance, in which the action of insulin is impaired, largely in skeletal muscles. Caveolin-3 (Cav3) is a muscle-specific subtype of caveolin, an example of a scaffolding protein found within membranes. Cav is also known as growth signal inhibitor, although it was recently demonstrated that the genetic disruption of Cav3 did not augment growth in mice. We found, however, that the lack of Cav3 led to the development of insulin resistance, as exemplified by decreased glucose uptake in skeletal muscles, impaired glucose tolerance test performance, and increases in serum lipids. Such impairments were markedly augmented in the presence of streptozotocin, a pancreatic beta cell toxin, suggesting that the mice were susceptible to severe diabetes in the presence of an additional risk factor. Insulin-stimulated activation of insulin receptors and downstream molecules, such as IRS-1 and Akt, was attenuated in the skeletal muscles of Cav3 null mice, but not in the liver, without affecting protein expression or subcellular localization. Genetic transfer of Cav3 by needle injection restored insulin signaling in skeletal muscles. Our findings suggest that Cav3 is an enhancer of insulin signaling in skeletal muscles but does not act as a scaffolding molecule for insulin receptors.
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Affiliation(s)
- Jin Oshikawa
- Departments of Physiology and Medicine, Yokohama City University School of Medicine, 3-9 Fukuura Kanazawa, Yokohama 236-0004, Japan
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23
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Oshikawa J, Toya Y, Fujita T, Egawa M, Kawabe J, Umemura S, Ishikawa Y. Nicotinic acetylcholine receptor alpha 7 regulates cAMP signal within lipid rafts. Am J Physiol Cell Physiol 2003; 285:C567-74. [PMID: 12748066 DOI: 10.1152/ajpcell.00422.2002] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [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: 11/22/2022]
Abstract
Neuronal nicotinic acetylcholine receptors (nAChRs) are made of multiple subunits with diversified functions. The nAChR alpha 7-subunit has a property of high Ca2+ permeability and may have specific functions and localization within the plasma membrane as a signal transduction molecule. In PC-12 cells, fractionation by sucrose gradient centrifugation revealed that nAChR alpha 7 existed in low-density, cholesterol-enriched plasma membrane microdomains known as lipid rafts where flotillin also exists. In contrast, nAChR alpha 5- and beta2-subunits were located in high-density fractions, out of the lipid rafts. Type 6 adenylyl cyclase (AC6), a calcium-inhibitable isoform, was also found in lipid rafts and was coimmunoprecipitated with nAChR alpha 7. Cholesterol depletion from plasma membranes with methyl-beta-cyclodextrin redistributed nAChR alpha 7 and AC6 diffusely within plasma membranes. Nicotine stimulation reduced forskolin-stimulated AC activity by 35%, and this inhibition was negated by either treatment with alpha-bungarotoxin, a specific antagonist of nAChR alpha 7, or cholesterol depletion from plasma membranes. The effect of cholesterol depletion was negated by the addition of cholesterol. These data suggest that nAChR alpha 7 has a specific membrane localization relative to other nAChR subunits and that lipid rafts are necessary to localize nAChR alpha 7 with AC within plasma membranes. In addition, nAChR alpha 7 may regulate the AC activity via Ca2+ within lipid rafts.
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Affiliation(s)
- Jin Oshikawa
- Department of Physiology and Medicine, Yokohama City University School of Medicine, Yokohama, Japan
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