研究者業績

永井 良三

ナガイ リョウゾウ  (Ryozo Nagai)

基本情報

所属
自治医科大学 自治医科大学 学長
学位
博士(医学)

J-GLOBAL ID
200901024033893870
researchmap会員ID
1000190318

受賞

 7

論文

 965
  • Yu Yoshiki, Yukio Ozaki, Mitsuru Abe, Tevfik F Ismail, Hiroshi Takahashi, Masaharu Akao, Hideki Kawai, Takashi Muramatsu, Masahide Harada, Masaya Ohta, Yosuke Hashimoto, Yuichiro Shiki, Masayuki Koshikawa, Keiichi Miyajima, Hidemaro Takatsu, Yudai Niwa, Naoyuki Kawashima, Reina Ozaki, Naotake Tsuboi, Satoshi Iimuro, Hiroshi Iwata, Ichiro Sakuma, Yoshihisa Nakagawa, Kiyoshi Hibi, Takafumi Hiro, Yoshihiro Fukumoto, Seiji Hokimoto, Katsumi Miyauchi, Hisao Ogawa, Hiroyuki Daida, Hiroaki Shimokawa, Hideo Izawa, Takeshi Kimura, Ryozo Nagai
    Journal of the American Heart Association 14(2) e034627 2025年1月21日  
    BACKGROUND: The effect of worsening renal function and baseline chronic kidney disease (CKD) on outcomes in patients with chronic coronary syndrome in the setting of optimal medical therapy remains unknown. METHODS AND RESULTS: The REAL-CAD (Randomized Evaluation of Aggressive or Moderate Lipid Lowering Therapy With Pitavastatin in Coronary Artery Disease) study is a prospective, multicenter, randomized trial of high-dose (pitavastatin 4 mg/day) or low-dose (pitavastatin 1 mg/day) statin therapy in 12 118 patients with chronic coronary syndrome. The primary end point was a composite of cardiovascular death, nonfatal myocardial infarction, stroke, or unstable angina requiring hospitalization (major adverse cardiac and cerebral events [MACCE]). CKD was defined as an estimated glomerular filtration rate [eGFR] <60 mL/min per 1.73 m2. WRF was defined as a decrease in eGFR ≥20% in the initial year; borderline renal function was an annual decrease of 0%<eGFR<20%, and stable renal function was no decrease. Of 12 118 patients, 4340 had baseline CKD and 7778 did not. The rate of MACCE at 5 years was significantly lower in those without (5.5%) versus with CKD (9.5%) (P<0.0001). After excluding 1247 patients who had MACCE, were censored, or missing eGFR within 1 year, 10 871 patients were included. Of these, 3885 were baseline CKD and the remaining 6986 did not have baseline CKD. Of the 10 871 patients, 577 patients had WRF, 6014 patients showed borderline renal function, and the remaining 4280 patients maintained stable renal function. In patients with CKD, WRF was an independent predictor for MACCE at 4 years as compared with stable renal function (hazard ratio [HR]: 1.67; [95% CI, 1.03-2.73; P=0.039]). In patients without CKD, borderline renal function was a significant predictor for MACCE at 4 years compared with stable renal function (HR: 1.40 [95% CI, 1.03-1.91; P=0.032]). CONCLUSIONS: Baseline CKD was an independent predictor for MACCE in patients with CCS. WRF was a significant predictor for MACCE in patients with CKD. Because borderline renal function was an independent predictor for MACCE even in patients without CKD, mild-to-moderate annual declines of eGFR should be carefully monitored (NCT01042730). REGISTRATION: URL: https://www.clinicaltrials.gov; Unique Identifier: NCT01042730.
  • Kosuke Nagaoka, Natsuka Kimura, Satoru Inoda, Takuya Takayama, Yusuke Arai, Yasuo Yanagi, Takashi Shimada, Ryozo Nagai, Hidenori Takahashi, Kenichi Aizawa
    International Journal of Molecular Sciences 26(2) 556-556 2025年1月10日  査読有り
  • Yasuhiro Hitomi, Yasushi Imai, Masanari Kuwabara, Yusuke Oba, Tomoyuki Kabutoya, Kazuomi Kario, Hisaki Makimoto, Takahide Kohro, Eiichi Shiraki, Naoyuki Akashi, Hideo Fujita, Tetsuya Matoba, Yoshihiro Miyamoto, Arihiro Kiyosue, Kenichi Tsujita, Masaharu Nakayama, Ryozo Nagai
    IJC Heart &amp; Vasculature 54 101507-101507 2024年10月  
  • Yusuke Oba, Tomoyuki Kabutoya, Takahide Kohro, Yasushi Imai, Kazuomi Kario, Hisahiko Sato, Kotaro Nochioka, Masaharu Nakayama, Naoyuki Akashi, Hideo Fujita, Yoshiko Mizuno, Arihiro Kiyosue, Takamasa Iwai, Yoshihiro Miyamoto, Yasuhiro Nakano, Masanobu Ishii, Taishi Nakamura, Kenichi Tsujita, Tetsuya Matoba, Ryozo Nagai
    Hypertension research : official journal of the Japanese Society of Hypertension 2024年9月19日  
    The Japanese Society of Hypertension have established a blood pressure (BP) target of 130/80 mmHg for patients with coronary artery disease (CAD). We evaluated the data of 8793 CAD patients in the Clinical Deep Data Accumulation System database who underwent cardiac catheterization at six university hospitals and the National Cerebral and Cardiovascular Center (average age 70 ± 11 years, 78% male, 43% with acute coronary syndrome [ACS]). Patients were divided into two groups based on whether or not they achieved the guideline-recommended BP of <130/80 mmHg. We analyzed the relationship between BP classification and major adverse cardiac and cerebral event (MACCE) separately in two groups: those with ACS and those with chronic coronary syndrome (CCS). During an average follow-up period of 33 months, 710 MACCEs occurred. A BP below 130/80 mmHg was associated with fewer MACCEs in both the overall (hazard ratio [HR] 0.83, 95% confidence interval [CI] 0.70-1.00, p = 0.048) and the ACS group (HR 0.67, 95%CI 0.51-0.88, p = 0.003). In particular, stroke events were also lower among those with a BP below 130/80 mmHg in both the overall (HR 0.69, 95%CI 0.53-0.90, p = 0.006) and ACS groups (HR 0.44, 95%CI 0.30-0.67, p < 0.001). In conclusion, the achievement of BP guidelines was associated with improved outcomes in CAD patients, particularly in reducing stroke risk among those with ACS.
  • 西田 翔, 石間 環, 木村 夏花, 岩見 大基, 永井 良三, 今井 靖, 相澤 健一
    移植 59(総会臨時) 292-292 2024年9月  

MISC

 1923
  • 増田 浩明, 松村 穣, 黒尾 誠, 相澤 宏樹, 永井 良三, 荒川 絵美, 鍋島 陽一
    Japanese circulation journal 62 317-317 1998年2月28日  
  • 松村 穣, 増田 浩明, 鍋島 陽一, 黒尾 誠, 相澤 宏樹, 永井 良三, 飯田 卓子, 荒川 絵美
    Japanese circulation journal 62 317-317 1998年2月28日  
  • 飯田 卓子, 荒川 絵美, 相澤 宏樹, 永井 良三, 松村 穣, 増田 浩明, 鍋島 陽一, 黒尾 誠
    Japanese circulation journal 62 317-317 1998年2月28日  
  • 大山 良雄, 相澤 宏樹, 相原 康, 倉林 正彦, 永井 良三, 増田 浩明, 松村 穣, 黒尾 誠, 鍋島 陽一
    Japanese circulation journal 62 314-314 1998年2月28日  
  • 外山 卓二, 星崎 洋, 磯部 直樹, 小板橋 紀通, 直田 匡彦, 中津川 昌利, 富田 智之, 川上 武, 堀江 康人, 夛田 浩, 櫻井 繁樹, 安達 仁, 内藤 滋人, 野上 昭彦, 大島 茂, 谷口 興一, 永井 良三
    Japanese circulation journal 62 261-261 1998年2月28日  
  • 坂本 浩之助, 中村 哲也, 阿久澤 暢洋, 角野 博之, 斉藤 勇一郎, 倉品 年成, 小野 善平, 永井 良三
    Japanese circulation journal 62 283-283 1998年2月28日  
  • 中村 哲也, 相澤 宏樹, 大山 良雄, 斉藤 勇一郎, 倉品 年成, 角野 博之, 星野 仁, 倉林 正彦, 永井 良三, 黒尾 誠, 松村 穣, 増田 浩明, 鍋島 陽一
    Japanese circulation journal 62 282-282 1998年2月28日  
  • 小和瀬 桂子, 倉林 正彦, 坂本 浩之助, 星野 洋一, 大山 良雄, 相澤 宏樹, 相原 康, 田中 亨, 内山 強, 阿久澤 暢洋, 都丸 浩一, 関口 賢一, 永井 良三, 神田 享勉
    Japanese circulation journal 62 370-370 1998年2月28日  
  • 都丸 浩一, 倉林 正彦, 新井 昌史, 大山 良雄, 相澤 宏樹, 関口 賢一, 相原 康, 田中 亨, 横山 知行, 永井 良三
    Japanese circulation journal 62 366-366 1998年2月28日  
  • 新井 昌史, 関口 賢一, 都丸 浩一, 滝沢 敬子, 横山 知行, 倉林 正彦, 永井 良三
    Japanese circulation journal 62 379-379 1998年2月28日  
  • 坂本 浩之助, 倉林 正彦, 岡本 栄一, 星野 洋一, 大山 良雄, 相原 康, 都丸 浩一, 関口 賢一, 田中 亨, 内山 強, 小和瀬 桂子, 阿久澤 暢洋, 神田 享勉, 永井 良三
    Japanese circulation journal 62 372-372 1998年2月28日  
  • 相原 康, 倉林 正彦, 新井 昌史, 大山 良雄, 相澤 宏樹, 都丸 浩一, 関口 賢一, 田中 亨, 内山 強, 小和瀬 桂子, 阿久澤 暢洋, 永井 良三
    Japanese circulation journal 62 369-369 1998年2月28日  
  • 小池 弘人, 神田 享勉, 永井 良三
    Japanese circulation journal 62 373-373 1998年2月28日  
  • Kurabayashi Masahiko, Arai Masashi, Aihara Yasushi, Ohyama Yoshio, Tanaka Toru, Tomaru Kouichi, Sekiguchi Ken-ichi, Nagai Ryozo
    Japanese circulation journal 62 15-15 1998年2月28日  
  • Yamazaki Tsutomu, Komuro Issei, Zou Yunzeng, Kudoh Sumiyo, Aikawa Ryuichi, Uozumi Hiroki, Nagai Ryozo, Yazaki Yoshio
    Japanese circulation journal 62 27-27 1998年2月28日  
  • 金古 善明, 谷口 靖広, 間仁田 守, 中島 忠, 伊藤 敏夫, 永井 良三
    Japanese circulation journal 62 550-550 1998年2月28日  
  • 倉品 年成, 中村 哲也, 星野 仁, 斉藤 勇一郎, 角野 博之, 小野 善平, 坂本 浩之助, 永井 良三
    Japanese circulation journal 62 131-131 1998年2月28日  
  • 相澤 宏樹, 中村 哲也, 大山 良雄, 今成 哲朗, 長谷川 昭, 倉林 正彦, 永井 良三, 木村 健二郎, 黒尾 誠, 松村 穣, 増田 浩明, 鍋島 陽一
    Japanese circulation journal 62 133-133 1998年2月28日  
  • 黒尾 誠, 松村 穣, 増田 浩明, 鍋島 陽一, 川口 浩, 相澤 宏樹, 須賀 達夫, 大山 良雄, 宇津木 敏浩, 倉林 正彦, 永井 良三
    Japanese circulation journal 62 61-61 1998年2月28日  
  • 倉林 正彦, 星野 洋一, 坂本 浩之助, 大山 良雄, 小和瀬 桂子, 神田 享勉, 渡辺 徳, 真鍋 一郎, 下村 行生, 永井 良三
    Japanese circulation journal 62 55-55 1998年2月28日  
  • 藤原 久義, 永井 良三
    Japanese circulation journal 62 51-51 1998年2月28日  
  • 鈴木 亨, 加藤 裕久, 矢崎 義雄, 内藤 滋人, 土尾 泰弘, 倉林 正彦, 永井 良三
    Japanese circulation journal 62 204-204 1998年2月28日  
  • 鈴木 亨, 加藤 裕久, 矢崎 義雄, 倉林 正彦, 永井 良三
    Japanese circulation journal 62 204-204 1998年2月28日  
  • 岩崎 俊弥, 岩崎 勉, 永井 良三, 遠藤 啓吾, 鈴木 亨, 加藤 裕久
    Japanese circulation journal 62 391-391 1998年2月28日  
  • 新井 昌史, 都丸 浩一, 滝沢 敬子, 関口 賢一, 横山 知行, 倉林 正彦, 永井 良三
    Japanese circulation journal 62 440-440 1998年2月28日  
  • 宮嶋 玲人, 長谷川 昭, 青柳 恵子, 星野 洋一, 山岸 高宏, 岡本 栄一, 倉林 正彦, 永井 良三
    Japanese circulation journal 62 465-465 1998年2月28日  
  • 倉林 正彦, 坂本 浩之助, 星野 洋一, 大山 良雄, 相澤 宏樹, 相原 康, 都丸 浩一, 関口 賢一, 田中 亨, 内山 強, 小和瀬 桂子, 神田 享勉, 永井 良三
    Japanese circulation journal 62 356-356 1998年2月28日  
  • 中島 忠, 平岡 昌和, 古川 哲史, 田中 敏博, 中村 祐輔, 永井 良三
    Japanese circulation journal 62(SupplementI) 1998年2月28日  
  • M Arai, K Tomaru, T Takizawa, K Sekiguchi, T Yokoyama, T Suzuki, R Nagai
    Journal of molecular and cellular cardiology 30(2) 243-54 1998年2月  査読有り
    The clinical utility of doxorubicin, an antineoplastic agent, is limited by its cardiotoxicity. Our objective was to determine whether expression of genes encoding proteins that affect Ca2+ homeostasis were altered in the hearts of rabbits chronically treated with doxorubicin. Twelve male New Zealand white rabbits received an injection of doxorubicin (2.5 mg/kg i.v.) once a week for 8 weeks. Eight rabbits were similarly injected with saline as controls. The cardiac function of both groups was evaluated 8 weeks after the final injection, as were the levels of expression of mRNA for Ca2+ transport proteins in the sarcoplasmic reticulum and plasma membrane. The amount of the sarcoplasmic reticulum Ca2+-ATPase and the Ca2+ uptake capacity of the protein were also quantitated. Cardiac output was significantly decreased in the doxorubicin-treated group (71+/-21 ml/min, P<0.05) compared with the control group (118+/-15 ml/min). The mRNA levels for the sarcoplasmic reticulum proteins were significantly diminished in the doxorubicin-treated hearts: ryanodine receptor-2 (relative expression level compared with controls, 0.35+/-0.13, P<0.01), sarcoplasmic reticulum Ca2+-ATPase (0.56+/-0.13, P<0.01), phospholamban (0.62+/-0.20, P<0.01) and cardiac calsequestrin (0. 57+/-0.26, P<0.01). In addition, both relative amount of sarcoplasmic reticulum Ca2+-ATPase protein (doxorubicin-treated group, 69+/-17% of control, P<0.01) and the Ca2+ uptake capacity (46. 9+/-9.8 nmol Ca2+/mg protein-5 min in doxorubicin group v 63.2+/-10. 4 in the control group, P<0.01) were concomitantly decreased with its mRNA expression level. Conversely, the mRNA levels for the plasma membrane proteins did not differ from those of control rabbits: the dihydropyridine receptor (relative expression level, 1. 03+/-0.30, N.S.), plasma membrane Ca2+-ATPase (0.93+/-0.33, N.S.) and the Na+/Ca2+ exchanger (0.87+/-0.34, N.S.). These findings suggest that a selective decrease in mRNA expression for sarcoplasmic reticulum Ca2+ transport proteins is responsible for the impaired Ca2+ handling, and thus, for the reduced cardiac function seen in the cardiomyopathy induced in rabbits by the long-term treatment with doxorubicin.
  • H Sumino, K Sato, T Sakamaki, H Masuda, T Nakamura, T Kanda, R Nagai
    Chest 113(2) 317-22 1998年2月  査読有り
    STUDY OBJECTIVES: The pathophysiologic role of nitric oxide (NO) released in the lung is not well understood. To determine whether the production of endogenous NO is correlated with any hemodynamic parameters, we measured the amount of NO released from the lung tissue of patients with heart disease. METHODS: Twenty patients (14 with ischemic heart disease, 4 with dilated cardiomyopathy, and 2 with mitral stenosis) and 16 normal control subjects were enrolled in the study. We measured exhaled air samples by using a method developed in our laboratory. The NO release rate from the lungs was calculated from the amount of exhaled NO and the duration of the exhalation. RESULTS: The rate of NO release was significantly lower in the patients with moderate-to-severe heart failure (New York Heart Association [NYHA] II or III) than in those with mild heart failure (NYHA I) or in normal control subjects. The rate of NO release was positively correlated with the cardiac index (r=0.50, p<0.05), and was negatively correlated with either the systemic (r= -0.58, p<0.01) or pulmonary vascular resistance (r=-0.45, p<0.05). In the patients with moderate-to-severe heart failure, the amount of NO released and the oxygen tension in the pulmonary artery were significantly lower compared with those parameters in patients with mild heart failure. CONCLUSIONS: Results suggest that the basal production of endogenous NO in the lung tissue of patients with heart failure is impaired, perhaps leading to the elevated pulmonary vascular tone seen in patients with moderate-to-severe heart failure.
  • T Kanda, S Kogure, M Nara, S Tsukui, T Utsugi, S Tomono, S Kawazu, R Nagai, I Kobayashi
    European journal of pharmacology 342(2-3) 297-302 1998年1月26日  査読有り
    We investigated the therapeutic effects of OK432 (picibanil; CAS39325-1-4), an immunomodulator that is derived from the Su strain of Streptococcus pyogenes. This agent was administered alone or combined with human interferon-alpha in a murine model of insulin-dependent diabetes mellitus. Interferon-alpha inhibits viral replication, reducing the incidence of virus-induced IDDM. Groups of DBA/2 mice (N = 25 per group) received an intraperitoneal injection of OK432 and interferon-alpha daily for 16 d beginning 1 d after inoculation with 500 plaque-forming units of encephalomyocarditis virus (EMCV). The dose of OK432 was one clinical unit (corresponding to 0.1 mg dried cells) per mouse, and that of interferon-alpha was 1 x 10(4) u/g. The animals were killed at random at 3 or 7 d after inoculation with EMCV. The survival rate of mice treated with the combination of OK432 and with interferon-alpha was significantly greater than that of the non-treated infected control animals (P < 0.01). Fasting levels of blood glucose were significantly lower in the mice administered the combination, than in the controls, both on day 3 (68 +/- 21 mg/dl vs. 270 +/- 135 mg/dl, P < 0.01) and on day 7 (101 +/- 29 mg/dl vs. 219 +/- 112 mg/dl, P < 0.01). Serum levels of insulin were significantly higher in the treated mice than in the controls (65 +/- 5 vs. 55 +/- 1 microU/ml, P < 0.05). However, in the mice treated with OK432 or interferon-alpha alone, the survival rate and the blood level of glucose and insulin did not differ from those of infected controls. Natural killer (NK) cell activity was significantly higher in the mice treated with the drug combination than in the controls on both days evaluated: day 3, 65 +/- 5 vs. 55 +/- 1%, n = 3, P < 0.05; day 7, 44 +/- 3 vs. 22 +/- 8%, n = 3, P < 0.05). Serum levels of murine interferon in the treated mice exceeded those in controls on both days evaluated (day 3, 671 U/ml vs. 442 U/ml; day 7, 57 U/ml vs. 43 U/ml). There were no significant differences in NK cell activity or in the interferon level in mice treated with either OK432 or interferon-alpha alone as compared with the infected, non-treated controls. Results suggest that the combination of OK432 and interferon-alpha protects against virally induced IDDM by increasing the activity of NK cells as well as the plasma level of interferon.
  • M Inoue, T Kanda, M Arai, T Suga, T Suzuki, I Kobayashi, R Nagai
    Experimental and clinical endocrinology & diabetes : official journal, German Society of Endocrinology [and] German Diabetes Association 106(6) 484-8 1998年  査読有り
    Accordingly, we induced streptozotocin diabetes in rats and evaluated the effects of ligating the coronary artery to produce myocardial infarct by analyzing hemodynamics and the expression of brain natriuretic peptide (BNP) messenger (m) RNA. Eight-week diabetic rats and age-matched nondiabetic rats underwent ligation of the coronary artery for 1 week. Left ventricular end-diastolic pressure (LVEDP) was not statistically different between diabetic rats (15+/-6 mmHg) and nondiabetic rats (13+/-9 mmHg) 1 week after coronary ligation, size of infarct, systolic blood pressure were also similar in both groups after coronary ligation. The BNP mRNA/beta-actin mRNA ratio in right ventricle of nondiabetic rats with MI was increased to 350+/-60%, however, in diabetic rats with MI, that was slightly increased to 200+/-50% (P < 0.01). The level of BNP mRNA in the left ventricle of diabetic rats with MI was not increased significantly (120+/-30% versus that in diabetic rats without MI), although that in left ventricle of nondiabetic rats with MI was increased to 280+/-40% versus nondiabetic rats without MI (P < 0.01). Cardiac BNP synthesis in diabetic rats completely reverted to control levels after insulin therapy.
  • K Tamama, T Kanda, M Osada, R Nagai, T Suzuki, I Kobayashi
    Journal of medicine 29(3-4) 231-6 1998年  査読有り
    Cardiomegaly is one of the commonest findings encountered in daily clinical practice, and its differential diagnosis is a common clinical problem. There are many electrocardiological (ECG) criteria known for left ventricular hypertrophy (LVH), but its limitations have also been suggested. We evaluated 102 patients fulfilling the ECG criteria of precordial and limb lead for LVH with echocardiographic findings as a gold standard. Among these 102 patients, the echocardiogram revealed 38 subjects with LVH, 26 subjects with left ventricular dilatation (LVD), 7 subjects with both findings, and 31 subjects with neither findings. Precordial criteria such as SV1+RV5 or RV6 > 30 mm, SV1 or SV2+RV5 > 35 mm, R+S > 40 mm, SV1 or SV2+RV5 or RV6 > 35 mm, SV2+RV4 or RV5 > 35 mm, high in sensitivity and low in specificity for LVD and LVH, are appropriate for screening LVD and LVH. Cornell limb lead criterion, SV3+RaVL > 28 mm (male), SV3+RaVL > 20 mm (female), high in sensitivity and specificity only for LVH, is the best elecrocardiographic criterion to evaluate LVH. Precordial and limb lead criteria such as R> 13 mm, RaVL > 12 mm, RaVF > 20 mm, onset of intrinsicoid deflection in V5 or V6> 0.05 sec, left axis deviation -30 degrees to -90 degrees, low in sensitivity, and high in specificity, are useful to rule out LVH and/or LVD. Our findings suggest LVD and LVH can be evaluated by ECG, but similar sensitivity and specificity for both LVH and LVD makes separation of LVH from LVD unattainable.
  • H Aizawa, A Hasegawa, M Arai, F Naganuma, M Hatori, T Kanda, T Suzuki, K Murata, Y Satoh, S Ishikawa, Y Morishita, R Nagai
    Internal medicine (Tokyo, Japan) 37(1) 56-9 1998年1月  査読有り
    Coronary ostial stenosis in otherwise normal coronary vessels, is a rare complication of syphilitic aortitis, and most of the cases are found at autopsy. We report here a case in which bilateral coronary ostial stenosis and aortic regurgitation due to syphilitic aortitis was diagnosed; coronary artery bypass graft and aortic valve replacement were then performed. The macroscopic finding and the histopathological examination of the ascending aorta revealed the presence of syphilitic aortitis. It is important to note that syphilis is one of the causes of coronary ostial stenosis in young adults associated with aortic regurgitation.
  • T Kanda, T Utsugi, S Kawazu, J E Wilson, D Yang, A Suarez, B M McManus, R Nagai, I Kobayashi
    Life sciences 63(1) 33-40 1998年  査読有り
    The role of lymphocytes in the pathogenesis of viral-induced insulin dependent diabetes mellitus (IDDM) is controversial. To better understand how a virus-induced IDDM depends on the infiltrating lymphocytes, encephalomyocarditis virus (EMCV) was inoculated intraperitoneally into three kinds of mice; virus-susceptible C57BL/6, virus-resistant 129/SV and recombination activity gene-2 (Rag2) knockout 129/SV mice. Pancreatic inflammation and beta cell necrosis were evaluated after EMCV, D variant (10(3) pfu/mouse) inoculation. On post-inoculation day 14, the lethal rates of C57BL/6, 129/SV and Rag2 knockout mice were 52, 10 and 100%, respectively. The blood glucose in Rag2KO mice on day 8 was significantly elevated as compared with 129SV mice (231 +/- 49 vs 169 +/- 32 mg/dl, P<0.05). In situ hybridization demonstrated the EMCV genome in the pancreas of Rag2 knockout and C57BL/6 mice, but not in 129/SV mice. Beta cell necrosis were more severe in Rag-2 knockout mice than in wild type 129/SV mice, but lymphocyte infiltration was less severe than C57BL/6. Pancreas in Rag2 knockout mice infected with virus were affected more severely than the virus-resistant strain of mice. Diabetogenic virus induced IDDM in virus-resistant mice without mature lymphocytes.
  • T. Hatori, T. Iwasaki, R. Seki, T. Yamagishi, T. Toyama, Y. Kaneko, A. Hasegawa, R. Nagai
    Journal of Cardiology 31(6) 381-384 1998年  
  • T Takahashi, T Kanda, M Inoue, H Sumino, I Kobayashi, A Iwamoto, R Nagai
    Life sciences 63(10) PL137-43-PL143 1998年  査読有り
    We evaluated the effects of FR901533, endothelin converting enzyme inhibitor, on development of right ventricular overload and medial thickening of pulmonary arteries in rats with monocrotaline-induced pulmonary hypertension. Pulmonary hypertension was induced by a single injection of monocrotaline (80 mg/kg). Twenty-four hours later (day 1), continuous subcutaneous injection of FR901533 (100 mg/kg/day) was started. Right ventricular systolic pressure, mass ratio of right ventricle to left ventricle, right ventricular wall thickness, right ventricular myocardial fiber diameter, percent medial thickness, and percent smooth muscle area in pulmonary arteries were significantly less in rats that received FR901533 than in the control with monocrotaline on day 28. Both immunoreactivities of endothelin-1 in pulmonary arteries and plasma endothelin-1 levels were observed significantly less in rats treated with FR901533 than in the control with monocrotaline. There were significant increased immunoreactivities of endothelin-B receptor in pulmonary arteries in rats that received FR901533 as compared with those in the control with monocrotaline. FR901533 (100 mg/kg/day), protected the development of right ventricular overload and medial thickening of pulmonary arteries in a rat model of pulmonary hypertension.
  • T Yamazaki, I Komuro, Y Zou, S Kudoh, I Shiojima, T Mizuno, Y Hiroi, R Nagai, Y Yazaki
    Hypertension (Dallas, Tex. : 1979) 31(1) 32-8 1998年1月  査読有り
    The purpose of the present study was to examine the effects of a long-acting calcium antagonist, amlodipine, on the development of cardiac remodeling. Dihydropyridine calcium antagonists have been used widely for many years in the treatment of hypertension and angina pectoris. It has been reported, however, that a prototype of dihydropyridines, nifedipine, does not reduce mortality of patients with ischemic heart disease, possibly because of reflex stimulation of the sympathetic nervous system. A calcium antagonist, amlodipine, has been reported to have potential benefits by virtue of a gradual onset of action and a long duration of effects. Amlodipine (8 mg/kg per day, once a day) or nifedipine (24 mg/kg per day, three times a day) was administered to spontaneously hypertensive 12-week-old rats for 12 weeks. Left ventricular wall thickness was measured by echocardiography, and relative amounts of myosin heavy chain isoforms were assessed by pyrophosphate gels. Expressions of "fetal type" genes and type 1 collagen gene were examined by Northern blot analysis. Amlodipine and nifedipine both markedly reduced systolic blood pressure. However, the decrease in systolic blood pressure caused by nifedipine continued for no more than 8 hours, whereas the blood pressure-lowering effect of amlodipine continued for more than 16 hours post dose. Amlodipine markedly reduced left ventricular wall thickness, whereas nifedipine only weakly attenuated an increase in the wall thickness. Amlodipine, but not nifedipine, prevented an increase in the relative amount of V3 myosin heavy chain isoform and suppressed an increase in mRNA levels of beta-myosin heavy chain, skeletal alpha-actin, and type 1 collagen. Unlike nifedipine, amlodipine effectively prevented cardiac remodeling secondary to high blood pressure at biochemical levels and morphological levels. These results suggest that a long-acting calcium antagonist is more effective than a short-acting one in preventing organ injury in hypertensive subjects.
  • T Nakamura, AM Alberola, FJ Salazar, Y Saito, T Kurashina, JP Granger, R Nagai
    NEPHRON 78(1) 104-111 1998年1月  
    The purpose of this study was to examine the role of endothelium-derived nitric oxide in modulating the effect of renal perfusion pressure (RPP) on renal interstitial hydrostatic pressure (RIHP) and urinary Na+ excretion (UNaV). The effects of RPP on renal hemodynamics, RIHP, and Na+ and Li+ excretions were determined in control Sprague-Dawley rats, in Sprague-Dawley rats pretreated with intravenous infusion of N-G-nitro-L-arginine methyl ester (L-NAME) at doses of 1, 5, and 50 mu g/kg/min, and in rats pretreated with L-NAME (5 mu g/kg/min) plus L-arginine (10 mg/kg/min). The RPP was changed from 95 to 135 mm Hg by an electronically servo-controlled aortic occluder above the renal arteries in all groups. Increasing RPP in control rats from 95 to 135 mm Hg increased RIHP (from 4.4 +/- 0.5 to 8.7 +/- 1.2 mm Hg), UNaV (from 2.37 +/- 0.61 to 8.29 +/- 1.59 mu Eq/min), and fractional excretion of Li+ (from 38.0 +/- 2.5 to 51.4 +/- 6.0%). In rats pretreated with L-NAME (5 mu g/kg/min), increases in RPP from 95 to 135 mm Hg had no effect on RIHP (from 1.6 +/- 0.4 to 2.2 +/- 0.6 mm Hg) or fractional excretion of Li+ and markedly attenuated pressure-natriuresis relationship (from 1.84 +/- 0.50 to 2.88 +/- 0.65 mu Eq/min). Although L-NAME did reduce renal plasma flow and glomerular filtration rate, the autoregulatory responses to RPP were maintained. In rats pretreated with L-NAME plus L-arginine, RIHP, UNaV, and fractional excretion of Li+ responses to RPP were similar to the control rats. The results of this study indicate that endothelium-derived nitric oxide plays an important role in modulating the effect of RPP on Na+ excretion by enhancing the transmission of RPP into the renal interstitium.
  • Y Matsumura, H Aizawa, T Shiraki-Iida, R Nagai, M Kuro-o, Y Nabeshima
    BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS 242(3) 626-630 1998年1月  
    Inactivation of the klotho (kl) gene in mice results in multiple disorders that resemble human aging. The mouse hi gene encodes a novel single-pass membrane protein with homology to beta-glucosidases. In this study, we have isolated a human homologue of the kl gene and determined its gene structure. The human kl gene is composed of 5 exons and ranges over 50 kb on chromosome 13q12. We have further identified two transcripts that encode a membrane or secreted protein. These transcripts arise from a single kl gene through alternative RNA splicing. Expression of the putative secreted form predominates over that of the membrane form. The present study provides fundamental information necessary for further analyses of the human kl gene and its functions. (C) 1998 Academic Press.
  • M Kuro-o, Y Matsumura, H Aizawa, H Kawaguchi, T Suga, T Utsugi, Y Ohyama, M Kurabayashi, T Kaname, E Kume, H Iwasaki, A Iida, T Shiraki-Iida, S Nishikawa, R Nagai, Y I Nabeshima
    Nature 390(6655) 45-51 1997年11月6日  
    A new gene, termed klotho, has been identified that is involved in the suppression of several ageing phenotypes. A defect in klotho gene expression in the mouse results in a syndrome that resembles human ageing, including a short lifespan, infertility, arteriosclerosis, skin atrophy, osteoporosis and emphysema. The gene encodes a membrane protein that shares sequence similarity with the beta-glucosidase enzymes. The klotho gene product may function as part of a signalling pathway that regulates ageing in vivo and morbidity in age-related diseases.
  • 永井 良三, 星野 洋一, 倉林 正彦, 黒尾 誠
    循環器専門医 : 日本循環器学会専門医誌 5(2) 263-273 1997年10月22日  
  • I Manabe, M Kurabayashi, Y Shimomura, M Kuro-o, N Watanabe, M Watanabe, M Aikawa, T Suzuki, Y Yazaki, R Nagai
    Biochemical and biophysical research communications 239(2) 598-605 1997年10月20日  査読有り
    To examine the molecular mechanisms that regulate the expression of the SMemb/NMHC-B gene, a nonmuscle myosin heavy chain isoform predominantly expressed in fetal aorta, we have isolated and characterized the 5'-flanking region of the rabbit SMemb/NMHC-B gene. Transient transfection experiments demonstrated that 105 base pairs of 5'-flanking sequence was necessary to direct high level transcription in C2/2 cells, vascular smooth muscle cells derived from rabbit aorta. An essential cis-regulatory element was localized between -100 and -91 base pairs from the transcription start site based on the results that replacement mutagenesis within this region significantly reduced promoter activity. Sequence of this region is completely conserved between mouse and rabbit and fits no known DNA binding consensus. Gel mobility shift assays revealed that a specific DNA-protein complex was formed at this site with nuclear extracts from C2/2 cells, which can be competed by H-2Kb CCAAT box but not by Hsp70 CCAAT box or other CCAAT-containing sequences. We conclude that expression of the SMemb/NMHC-B gene is regulated through an interaction between a sequence element located at -100 and a distinct member of CCAAT-binding proteins.
  • H Masuda, M Kurabayashi, M Watanabe, Y Ohyama, Y Aihara, N Watanabe, R Nagai
    CIRCULATION 96(8) 1316-1316 1997年10月  
  • M Kuroo, Y Matsumura, H Aizawa, R Nagai, Y Nabeshima
    CIRCULATION 96(8) 2297-2297 1997年10月  
  • T Tanaka, T Itoh, R Nagai, Y Yazaki, Y Nakamura
    AMERICAN JOURNAL OF HUMAN GENETICS 61(4) A115-A115 1997年10月  
  • M Aikawa, E Rabkin, H Shing, SJ Voglic, R Nagai, FJ Schoen, P Libby
    CIRCULATION 96(8) 1275-1275 1997年10月  
  • H Sakamoto, M Kurabayashi, N Watanabe, M Kuroo, Manabe, I, E Okamoto, Y Hoshino, T Kanda, R Nagai
    CIRCULATION 96(8) 3368-3368 1997年10月  
  • Y Sando, T Inoue, R Nagai, K Endo
    EUROPEAN JOURNAL OF NUCLEAR MEDICINE 24(10) 1237-1244 1997年10月  
    To date, there has been neither a good method to clarify the three-dimensional distribution of pulmonary ventilation/perfusion ((V) over dot(A)/(Q) over dot) ratios, nor a convenient way to assess (V) over dot(A)/(Q) over dot inequality, The purpose of this study was to develop a functional image of pulmonary (V) over dot(A)/(Q) over dot over dot ratios based on data acquired with simultaneous dual-radionuclide single-photon emission tomography (SPET) and to assess (V) over dot(A)/(Q) over dot unevenness through the (V) over dot(A)/(Q) over dot histogram in patients with various pulmonary diseases. Dual-radionuclide SPET was performed with technetium-99m macroaggregated albumin (MAA) and krypton-81m, with the patient in the supine position, Af ter correction for linear cross-talk, the total acquisition counts of both radionuclides were equalized, The (V) over dot(A)/(Q) over dot ratio, which was calculated in each pixel by dividing the Kr-81m count by the Tc-99m-MAA count, was expressed as a (V) over dot(A)/(Q) over dot image. A histogram of the pixel number plotted against the (V) over dot(A)/(Q) over dot ratios was then produced and its centre of weight (CW) and standard deviation (SD) determined, Ten healthy volunteers and 46 patients [seven with pulmonary vascular disease (PVD), nine with pulmonary emphysema (PE), 18 with bronchogenic carcinoma and 12 with miscellaneous diseases] participated in this study, In normal volunteers, (V) over dot(A)/(Q) over dot ratios were generally even, but were slightly lower in dorsal regions, Patients with PVD had lobar and/or segmental areas with a high (V) over dot(A)(Q) over dot ratio, Low (V) over dot(A)(Q) over dot areas extended widely in patients with PE, Bronchogenic carcinoma exceeding 3 cm in diameter was detected as a very low (V) over dot(A)/(Q) over dot area, The SD of (V) over dot(A)/(Q) over dot ratios had a significant positive correlation both with A-aDO(2) (r=0.64, P&lt;0.001) and with cigarette smoking history (r=0.72, P&lt;0.001), It is concluded that the (V) over dot(A)/(Q) over dot ratio image produced with simultaneous dual-radionuclide SPET using Tc-99m-MAA and Kr-81m is a unique and simple method for demonstrating the three-dimensional distribution of (V) over dot(A)/(Q) over dot ratios, The unevenness of (V) over dot(A)/(Q) over dot distribution can be assessed through the SD of the (V) over dot(A)/(Q) over dot histogram.
  • K Kowase, T Nakamura, W Okumura, E Okamoto, E Yamaguchi, H Sato, M Arai, S Imai, A Hasegawa, R Nagai
    JAPANESE CIRCULATION JOURNAL-ENGLISH EDITION 61(10) 882-885 1997年10月  
    We describe the novel karyotype of a 33-year-old woman with severe mental retardation and multiple cardiac anomalies, including patent ductus arteriosus, a ventricular septal defect, pulmonary atresia, and an overriding aorta. Her karyotype was 46, XX, add(17)(p13). The short arm of chromosome 17 was slightly elongated owing to the deletion of the distal portion of that chromosome and the addition of extra material from another chromosome. Miller-Dieker syndrome is characterized by a patent ductus arteriosus, lissencephaly, and the deletion of chromosome 17p13.3; however, as the patient's brain surface appeared normal on computed tomography, Miller-Dieker syndrome was excluded. The breakpoint in her chromosome 17 was probably located distal to band 17p13.3. In fact, fluorescence in situ hybridization analysis demonstrated that band 17p13.3 was intact. To date, genes distal to 17p13.3 have not been implicated in cardiac anomalies. This patient probably carries a novel deletion on the short arm of chromosome 17.

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 91