Papers - KITAMURA Kazuo
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Immunohistochemical identification of adrenomedullin in human, rat, and porcine tissue Reviewed
Washimine H., Asada Y., Kitamura K., Ichiki Y., Hara S., Yamamoto Y., Kangawa K., Sumiyoshi A., Eto T.
Histochemistry and Cell Biology 103 ( 4 ) 251 - 254 1995.4
Publishing type：Research paper (scientific journal) Publisher：Histochemistry and Cell Biology
The histological localization was investigated of adrenomedullin (AM), a novel vasorelaxant peptide originally isolated from human pheochromocytoma. The immunohistological distribution was examined of AM in human, rat, and procine tissues using a polyclonal antibody to a fragment comprising C-terminal amino acids 40-52 of human adrenomedullin [AM(40-52)NH2]. Almost all of the human pheochromocytoma and normal adrenal medullary cells of all three species were immunostained and found to be intensely positive for AM. Furthermore, AM-immunoreactive cells were present in the pancreatic islets, gastrointestinal neuroendocrine system, anterior pituitary, and choroid plexus with some degree of interspecies heterogeneity. These findings indicate that AM-immunoreactive cells are widely distributed in the endocrine and neuroendocrine system, suggesting that AM plays some important role in the control of systemic and local circulation and also of humoral secretion. © 1995 Springer-Verlag.
DOI： 10.1007/BF01457408
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Mechanisms of adrenomedullin-induced vasodilation in the rat kidney Reviewed
Hirata Y., Hayakawa H., Suzuki Y., Suzuki E., Ikenouchi H., Kohmoto O., Kimura K., Kitamura K., Eto T., Kangawa K., Matsuo H., Omata M.
Hypertension 25 ( 4 II ) 790 - 795 1995.4
Publishing type：Research paper (scientific journal) Publisher：Hypertension
To explore the mechanism of adrenomedullin-induced vasorelaxation, we tested the effects of adrenomedullin on renal function in rats in vivo and measured the release of endothelium-derived nitric oxide from isolated perfused rat kidney (using a chemiluminescence assay) and the diameters of the glomerular arterioles in the hydronephrotic kidney. Adrenomedullin decreased blood pressure in a dose-dependent manner (3 nmol/kg: -29±2% [SEM]; P<.01) and slightly increased the glomerular filtration rate and urinary sodium excretion (+108%; P<.05). These changes were associated with significant increases in urinary excretion of cyclic AMP (+54%; P<.05). Adrenomedullin decreased renal vascular resistance (10-7 mol/L adrenomedullin: -41 ± 2%; P<.001) and increased release of nitric oxide (+5.1±0.7 fmol/min per gram kidney weight; P<.001) in the isolated kidney. This increase in nitric oxide release was abolished by the inhibitor N(G)- monomethyl-L-arginine, and it also reversed the decrease in renal vascular resistance seen with adrenomedullin. Renal responses of deoxycorticosterone acetate-salt hypertensive rats to adrenomedullin were significantly smaller than those of control rats for both release of nitric oxide (10-7 mol/L adrenomedullin: +0.8±0.2 fmol/min per gram kidney weight; P<.01 versus control) and renal vasodilation (-28±6%; P<.05). Videomicroscopic analysis revealed that adrenomedullin increased the diameters of both afferent and efferent arterioles (3 nmol/kg: +11%; P<.05). Thus, adrenomedullin-induced renal vasodilation is partially endothelium dependent and is attenuated in deoxycorticosterone acetate-salt hypertension, probably due to endothelial damage.
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Molecular forms of human brain natriuretic peptide (BNP) in plasma of patients on hemodialysis (HD) Reviewed
Y Ishizaka 1, Y Yamamoto, M Tanaka, F Kato, Y Ishizaka, N Yokota, J Kato, K Kitamura, T Eto, K Kangawa, et al.
Clin Nephrol . 1995 Apr;43(4):237-42. 43 ( 4 ) 237 - 242 1995.4
Publishing type：Research paper (scientific journal)
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Adrenomedullin: Implications for Hypertension Research Reviewed
Kitamura K., Kangawa K., Matsuo H., Eto T.
Drugs 49 ( 4 ) 485 - 495 1995.4
Publishing type：Research paper (scientific journal) Publisher：Drugs
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Shimekake Y., Nagata K., Ohta S., Kambayashi Y., Teraoka H., Kitamura K., Eto T., Kangawa K., Matsuo H.
Journal of Biological Chemistry 270 ( 9 ) 4412 - 4417 1995.3
Publishing type：Research paper (scientific journal) Publisher：Journal of Biological Chemistry
The biological action of adrenomedullin, a novel hypotensive peptide, on bovine aortic endothelial cells, was examined. The specific binding of adrenomedullin to these cells was observed, and adrenomedullin was found to induce intracellular cAMP accumulation in a dose-dependent manner. EC50 for the cAMP accumulation was about 100 times lower than the apparent IC50 for the binding assay. Adrenomedullin also induced increase of intracellular free Ca2+ in endothelial cells in a dose-dependent manner. The Ca2+ response to adrenomedullin was biphasic with an initial transient increase due to the release from thapsigargin-sensitive intracellular Ca2+ storage and a prolonged increase by influx through the ion channel on the plasma membrane. This intracellular free Ca2+ increase resulted from phospholipase C activation and inositol 1,4,5-trisphosphate formation, and seemed to cause nitric oxide synthase activation by monitoring intracellular cGMP accumulation. Both cAMP accumulation and Ca2+ increased responses to adrenomedullin were mediated by cholera toxin-sensitive G protein, but the two signal transduction pathways were independent. Thus, the results suggest that adrenomedullin elicits the hypotensive effect through at least two mechanisms, a direct action on vascular smooth muscle cells to increase intracellular cAMP and an action on endothelial cells to stimulate nitric oxide release, with both leading to vascular relaxation.
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Katoh F., Kitamura K., Niina H., Yamamoto R., Washimine H., Kangawa K., Yamamoto Y., Kobayashi H., Eto T., Wada A.
Journal of Neurochemistry 64 ( 1 ) 459 - 461 1995.1
Publishing type：Research paper (scientific journal) Publisher：Journal of Neurochemistry
Abstract: In cultured bovine adrenal medullary cells, stimulation of nicotinic receptors by carbachol evoked the Ca2+‐dependent exocytotic cosecretion of proadrenomedullin N‐terminal 20 peptide (PAMP) (EC50 = 50.1 µM) and catecholamines (EC50 = 63.0 µM), with the molar ratio of PAMP/catecholamines secreted being equal to the ratio in the cells. Addition of PAMP[1–20]NH2 inhibited carbachol‐induced 22Na+ influx via nicotinic receptors (IC50 = 2.5 µM) in a noncompetitive manner and thereby reduced carbachol‐induced 45Ca2+ influx via voltage‐dependent Ca2+ channels (IC50 = 1.0 µM) and catecholamine secretion (IC50 = 1.6 µM). It did not alter high K+‐induced 45Ca2+ influx via voltage‐dependent Ca2+ channels or veratridine‐induced 22Na+ influx via voltage‐dependent Na+ channels. PAMP seems to be a novel antinicotinic peptide cosecreted with catecholamines by a Ca2+‐dependent exocytosis in response to nicotinic receptor stimulation. Copyright © 1995, Wiley Blackwell. All rights reserved
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アドレノメデュリン含有細胞がラット視床下部室傍核および視索上核に存在する Reviewed
上田陽一、西野枝子、椛島成利、澁谷泉、北村和雄、寒川賢治、山下博
日本内分泌学会雑誌 71 ( 6 ) 929 - 929 1995
Publishing type：Research paper (scientific journal)
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培養血管内皮細胞におけるアドレノメデュリン(AM)の産生・分泌とその調節機構 Reviewed
庄司浩気、南野直人、諏合伸、北村和雄、江藤胤尚、寒川賢治、松尾壽之
日本内分泌学会雑誌 71 ( 3 ) 361 - 361 1995
Publishing type：Research paper (scientific journal)
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ブタ各組織におけるアドレノメヂュリン免疫活性の分子型の同定 Reviewed
市来能成、北村和雄、寒川賢治、江藤胤尚
日本内分泌学会雑誌 71 ( 3 ) 424 - 424 1995
Publishing type：Research paper (scientific journal)
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起立負荷時における血中アドレノメデュリン分泌動態 Reviewed
井手野順一、本多一文、中村友厚、六角久美子、斎藤孝子、北村和雄
日本 71 ( 3 ) 500 - 500 1995
Publishing type：Research paper (scientific journal)
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視索上核神経内分泌細胞におけるアドレノメデュリンの作用：スライスパッチ法による検討 Reviewed
椛島成利,nurhadiibrahim,澁谷泉、野口淳、上田陽一、北村和雄、寒川賢治、山下博
日本内分泌学会雑誌 71 ( 6 ) 930 - 930 1995
Publishing type：Research paper (scientific journal)
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新しい循環調節因子の発見 Reviewed
寒川賢治、南野直人、松尾壽之、北村和雄、江藤胤尚
日本内分泌学会雑誌 71 ( 3 ) 260 - 260 1995
Publishing type：Research paper (scientific journal)
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TANAKA Miho, KITAMURA Kazuo, ISHIZAKA Yuko, ISHIYAMA Yuichiro, KATO Johji, KANGAWA Kenji, ETO Tanenao
Internal Medicine 34 ( 8 ) 728 - 733 1995
Language：English Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Internal Medicine
Adrenomedullin is a novel hypotensive peptide recently discovered in human pheochromocytoma. In the present study, we measured the plasma immunoreactive adrenomedullin of healthy subjects and patients with various diseases. Immunoreactive adrenomedullin was found to circulate in blood of the healthy subjects at a considerable concentration (3.3±0.3 fmol/ml). Plasma adrenomedullin was significantly increased in the patients with congestive heart failure (5.4±0.3 fmol/ml), essential hypertension (5.3±0.4 fmol/ml) and renal disease (4.9±0.4 fniol/ml). In healthy volunteers physical exercise significantly increased the plasma adrenomedullin concentration. The increase of adrenomedullin was inversely related to systolic blood pressure. These findings indicate that adrenomedullin participates in the circulation control in both physiological and diseased conditions. Although the exact origin of circulating adrenomedullin is still unknown, it is thought to be released rapidly by acute exercise, thereby regulating the cardiovascular system by its vasodilating activity.<br>(Internal Medicine 34: 728-733, 1995)
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視索上核神経内分泌細胞におけるアドレノメデュリンの作用：Ca2+画像解析法による検討 Reviewed
椛島成利、nurtiadiIbrahim、澁谷泉、野口淳、上田陽一、北村和雄、寒川賢治、山下博
日本内分泌学会雑誌 71 ( 6 ) 930 - 930 1995
Publishing type：Research paper (scientific journal)
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新しい降圧ペプチド"proadrenomedullin N-terminal 20 peptide(PAMP)"の研究:単離・構造決定, 生体内分布と生物学的活性の検討 Reviewed
北村和雄、鷲峯久紀、市来能成、加藤ふみ、江藤胤尚、和田明彦、寒川賢治、松尾壽之
日本内分泌学会雑誌 71 ( 3 ) 412 - 412 1995
Authorship：Lead author Publishing type：Research paper (scientific journal)
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新しい降圧ペプチド“アドレノメデュリン” Reviewed
北村和雄
医学のあゆみ 173 ( 11 ) 910 - 911 1995
Authorship：Lead author Publishing type：Research paper (scientific journal)
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培養血管平滑筋細胞におけるアドレノメデュリン(AM)の産生調節--血菅作動性物質を中心として Reviewed
諏合伸、南野直人、庄司浩気、北村和雄、江藤胤尚、寒川賢治、松尾壽之
日本内分泌学会 71 ( 3 ) 413 - 413 1995
Publishing type：Research paper (scientific journal)
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Human proadrenomedullin N-terminal 20 peptide in pheochromocytoma and normal adrenal medulla Reviewed
Kuwasako K., Kitamura K., Ichiki Y., Kato J., Kangawa K., Matsuo H., Eto T.
Biochemical and Biophysical Research Communications 211 ( 2 ) 694 - 699 1995
Publishing type：Research paper (scientific journal) Publisher：Biochemical and Biophysical Research Communications
Proadrenomedullin N-terminal 20 peptide (PAMP) is a novel hypotensive peptide found in adrenomedullin precursor. Using a radioimmunoassay for human PAMP, we purified immunoreactive PAMP (ir-PAMP) from human pheochromocytoma and determined its complete amino acid sequence. The major component of PAMP-like immunoreactivity was found to be PAMP [1-20] NH2 with an amino acid sequence identical to that of the deduced amino acid sequence by cDNA analysis. Both ir-PAMP and ir-adrenomedullin were found to be abundant in normal adrenal medulla as well as pheochromocytoma tissue arising from adrenal medulla, and there was a significantly (p < 0.05) positive correlation between ir-adrenomedullin and ir-PAMP concentrations in these tissues. However, the PAMP/adrenomedullin ratio in pheochromocytoma tissues (0.197 ± 0.013) was significantly (p < 0.005) lower than that in adrenal medullae (0.384 ± 0.041). The present data indicate that PAMP is biosynthesized from adrenomedullin precursor, but the biosynthesis or metabolism of PAMP in pheochromocytoma may be different from that of normal adrenal medulla. © 1995 Academic Press, Inc.
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Endothelin-1 and big endothelin-1 increase in human endometrium during menstruation Reviewed
Ohbuchi H., Nagai K., Yamaguchi M., Ikenoue T., Mori N., Kitamura K., Araki S., Toshimori K.
American Journal of Obstetrics and Gynecology 173 ( 5 ) 1483 - 1490 1995
Publishing type：Research paper (scientific journal) Publisher：American Journal of Obstetrics and Gynecology
OBJECTIVES: Although the physiologic and pathologic roles of endothelin-1 in reproduction have been investigated, little is known about human uterine tissue levels. We studied the levels of immunoreactive endothelin-1 and immunoreactive big endothelin-1 in human endometrium and myometrium during each menstrual phase. STUDY DESIGN: Materials were obtained at hysterectomy (endometrium, n = 33; myometrium, n = 27). We measured immunoreactive endothelin-1 and immunoreactive big endothelin-1 by radioimmunoassay and performed an immunohistochemical study of the tissue. Data were analyzed by the Mann-Whitney U test. RESULTS: We detected larger amounts of immunoreactive endothelin-1 and immunoreactive big endothelin-1 in the endometrium than in the myometrium throughout the menstrual, proliferative, and secretory phases. Endometrial immunoreactive endothelin-1 and immunoreactive endothelin-1 were significantly increased in the menstrual phase (endothelin-1 68.8 ± 23.3 pg/mg protein, n = 5, p < 0.005; big endothelin-1 45.2 ± 5.7 pg/mg protein, n = 5, p < 0.003) compared with the other phases (endothelin-1 30.7 ± 9.5 and 30.5 ± 14.0 pg/mg protein; big endothelin-1 19.9 ± 6.7 and 24.1 ± 7.4 pg/mg protein). Immunohistochemistry demonstrated that the endometrial stromal cells were positive for antiendothelin monoclonal antibody only in the premenstrual and menstrual phases. CONCLUSION: Levels of immunoreactive endothelin-1 and immunoreactive big endothelin-1 are different in each type of uterine tissue and in each phase of the menstrual cycle. These changes may indicate some role of endothelin-1 in menstruation. © 1995, All rights reserved.
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Sugo S., Minamino N., Shoji H., Kangawa K., Kitamura K., Eto T., Matsuo H.
Biochemical and Biophysical Research Communications 207 ( 1 ) 25 - 32 1995
Publishing type：Research paper (scientific journal) Publisher：Biochemical and Biophysical Research Communications
To elucidate physiological functions of adrenomedullin (AM) secreted from vascular smooth muscle cells (VSMCs), we examined the effect of cytokines, growth factors and related substances on AM production in cultured rat VSMC. Among them, interleukin-1α (IL-1α), IL-1β, tumor necrosis factor-α (TNF-α) and TNF-β, as well as lipopolysaccharide (LPS), markedly augmented production and gene expression of AM. Although maximal stimulation levels of these substances were not greatly different, ED50 values of IL-1s (0.3 ng/ml) were about 1/10 that of TNFs and LPS. AM mRNA levels maximized at 3-6 h after stimulation with IL-1β and LPS, while TNF-α increased the AM mRNA level up to 48 h. Furthermore, IL-1α, TNF-α and LPS additively increased AM production in VSMC. AM production was slightly augmented by fibroblast, epidermal and platelet derived growth factors. These results suggest that AM secreted from VSMC actually exerts a vasorelaxant effect under physiological conditions such as endotoxin shock, atherosclerosis and inflammation. © 1995 Academic Press, Inc.