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Department of Medicine and Clinical Science (K.T., H.A., N.K., H.I., A.Y., M.H., K.M., Y.K., Y.O., K.H., T.A., K.N.), Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan; Clinical Research Institute Center for Endocrine and Metabolic Diseases (T.U., A.S.), Kyoto National Hospital, Kyoto 612-8555, Japan; and Department of Biochemistry, National Cardiovascular Center Research Institute (M.K., K.K.), Osaka 565-8565, Japan
Abstract
Ghrelin is a recently identified endogenous ligand for the GH secretagogue receptor and is involved in a novel system for regulating GH release. However, little is known about its GH-releasing activity and other endocrine effects in humans. To address this issue, we studied the GH, ACTH, cortisol, PRL, LH, FSH, and TSH responses to synthetic human ghrelin. In four normal male adults (2837 yr), iv ghrelin administration released GH in a dose-dependent manner and 0.2, 1.0, and 5.0 µg/kg ghrelin produced 43.3 ± 6.0, 81.5 ± 12.7, and 107.0 ± 10.7 ng/mL of the GH peak values at 30 min, respectively. ACTH, cortisol, and PRL levels were also elevated after ghrelin injection, while the lowest dose (0.2 µg/kg) resulted in only minimum peak values of these hormones (22.8 ± 3.0 pg/mL, 9.4 ± 1.9 µg/dL, and 4.6 ± 0.6 ng/mL, respectively). There were no significant changes in LH, FSH, or TSH levels. This is the first study showing evidence that ghrelin strongly stimulates GH release in humans.
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T Akamizu, T Murayama, S Teramukai, K Miura, I Bando, T Irako, H Iwakura, H Ariyasu, H Hosoda, H Tada, et al. Plasma ghrelin levels in healthy elderly volunteers: the levels of acylated ghrelin in elderly females correlate positively with serum IGF-I levels and bowel movement frequency and negatively with systolic blood pressure J. Endocrinol., February 1, 2006; 188(2): 333 - 344. [Abstract] [Full Text] [PDF] |
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J. Iqbal, Y. Kurose, B. Canny, and I. J. Clarke Effects of Central Infusion of Ghrelin on Food Intake and Plasma Levels of Growth Hormone, Luteinizing Hormone, Prolactin, and Cortisol Secretion in Sheep Endocrinology, January 1, 2006; 147(1): 510 - 519. [Abstract] [Full Text] [PDF] |
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N Govoni, R De Iasio, C Cocco, A Parmeggiani, G Galeati, U Pagotto, C Brancia, M Spinaci, C Tamanini, R Pasquali, et al. Gastric immunolocalization and plasma profiles of acyl-ghrelin in fasted and fasted-refed prepuberal gilts J. Endocrinol., September 1, 2005; 186(3): 505 - 513. [Abstract] [Full Text] [PDF] |
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N. Nagaya, T. Itoh, S. Murakami, H. Oya, M. Uematsu, K. Miyatake, and K. Kangawa Treatment of Cachexia With Ghrelin in Patients With COPD Chest, September 1, 2005; 128(3): 1187 - 1193. [Abstract] [Full Text] [PDF] |
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M. Misra, K. K. Miller, V. Stewart, E. Hunter, K. Kuo, D. B. Herzog, and A. Klibanski Ghrelin and Bone Metabolism in Adolescent Girls with Anorexia Nervosa and Healthy Adolescents J. Clin. Endocrinol. Metab., September 1, 2005; 90(9): 5082 - 5087. [Abstract] [Full Text] [PDF] |
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Y. Date, K. Toshinai, S. Koda, M. Miyazato, T. Shimbara, T. Tsuruta, A. Niijima, K. Kangawa, and M. Nakazato Peripheral Interaction of Ghrelin with Cholecystokinin on Feeding Regulation Endocrinology, August 1, 2005; 146(8): 3518 - 3525. [Abstract] [Full Text] [PDF] |
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M. Misra, K. K. Miller, K. Kuo, K. Griffin, V. Stewart, E. Hunter, D. B. Herzog, and A. Klibanski Secretory dynamics of ghrelin in adolescent girls with anorexia nervosa and healthy adolescents Am J Physiol Endocrinol Metab, August 1, 2005; 289(2): E347 - E356. [Abstract] [Full Text] [PDF] |
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C Dornonville de la Cour, A Lindqvist, E Egecioglu, Y C L Tung, V Surve, C Ohlsson, J-O Jansson, C Erlanson-Albertsson, S L Dickson, and R Hakanson Ghrelin treatment reverses the reduction in weight gain and body fat in gastrectomised mice Gut, July 1, 2005; 54(7): 907 - 913. [Abstract] [Full Text] [PDF] |
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G Natalucci, S Riedl, A Gleiss, T Zidek, and H Frisch Spontaneous 24-h ghrelin secretion pattern in fasting subjects: maintenance of a meal-related pattern Eur. J. Endocrinol., June 1, 2005; 152(6): 845 - 850. [Abstract] [Full Text] [PDF] |
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U. Jaakkola, T. Kuusela, T. Jartti, U. Pesonen, M. Koulu, T. Vahlberg, and J. Kallio The Leu7Pro Polymorphism of PreproNPY Is Associated with Decreased Insulin Secretion, Delayed Ghrelin Suppression, and Increased Cardiovascular Responsiveness to Norepinephrine during Oral Glucose Tolerance Test J. Clin. Endocrinol. Metab., June 1, 2005; 90(6): 3646 - 3652. [Abstract] [Full Text] [PDF] |
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A. M. Avram, C. A. Jaffe, K. V. Symons, and A. L. Barkan Endogenous Circulating Ghrelin Does Not Mediate Growth Hormone Rhythmicity or Response to Fasting J. Clin. Endocrinol. Metab., May 1, 2005; 90(5): 2982 - 2987. [Abstract] [Full Text] [PDF] |
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