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Department of Medicine and Clinical Science, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama City 700-8558, Japan
Address all correspondence and requests for reprints to: Fumio Otsuka, M.D., Ph.D., Department of Medicine and Clinical Science, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama City, 700-8558. E-mail: fumiotsu{at}md.okayama-u.ac.jp.
Aldosterone production is modified by several growth factors that reside in the adrenal. We have recently reported the existence of a bone morphogenetic protein (BMP) system in human adrenocortical cells, in which BMP-6 augments aldosterone synthesis. Here, we investigated functional roles of BMP-6, focusing on the differential regulation of aldosterone synthesis induced by angiotensin (Ang) II and potassium (K). In human adrenocortical H295R cells, BMP-6 augmented Ang II-induced CYP11B2 transcription and mRNA and aldosterone production but had no effect on K-induced aldosterone production. Inhibition of endogenous BMP-6 action by neutralizing antibodies impaired aldosterone production induced by Ang II but not that induced by K. Blockage of ligand-receptor binding using extracellular domain (ECD) of BMP type I receptors revealed that ECDs to activin receptor-like kinase (ALK)-2 and ALK-3 significantly reduced the aldosterone production induced by Ang II. None of the type I-receptor ECDs tested had any effect on K-induced aldosterone levels. Overexpression of a dominant negative-activin type II receptor construct selectively decreased Ang II-induced aldosterone production without having any effect on K-induced aldosterone production. BMP type II receptor-dominant negative had no effect on aldosterone induced by either Ang II or K. These results infer that BMP-6 acts through ALK-2, ALK-3, and activin type II receptor receptors in adrenocortical cells. BMP-6 pretreatment extends the induction of ERK1/2 phosphorylation by Ang II and treatment with ECDs to ALK-2 and ALK-3 impaired Ang II-induced ERK phosphorylation. The specific inhibitor of ERK activation, U0126, suppressed the activation of CYP11B2 transcription induced by BMP-6 without affecting Smad phosphorylation and Tlx2-Luc activity. Collectively, the endogenous BMP-6 system plays critical roles in aldosterone production between Ang II and K through ERK signaling pathway.
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  H. Otani, F. Otsuka, K. Inagaki, J. Suzuki, T. Miyoshi, Y. Kano, J. Goto, T. Ogura, and H. Makino Aldosterone Breakthrough Caused by Chronic Blockage of Angiotensin II Type 1 Receptors in Human Adrenocortical Cells: Possible Involvement of Bone Morphogenetic Protein-6 Actions Endocrinology, June 1, 2008; 149(6): 2816 - 2825. [Abstract] [Full Text] [PDF]
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 T. Miyoshi, F. Otsuka, H. Otani, K. Inagaki, J. Goto, M. Yamashita, T. Ogura, Y. Iwasaki, and H. Makino Involvement of bone morphogenetic protein-4 in GH regulation by octreotide and bromocriptine in rat pituitary GH3 cells J. Endocrinol., April 1, 2008; 197(1): 159 - 169. [Abstract] [Full Text] [PDF]
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M. Yamashita, F. Otsuka, T. Mukai, H. Otani, K. Inagaki, T. Miyoshi, J. Goto, M. Yamamura, and H. Makino Simvastatin antagonizes tumor necrosis factor-{alpha} inhibition of bone morphogenetic proteins-2-induced osteoblast differentiation by regulating Smad signaling and Ras/Rho-mitogen-activated protein kinase pathway J. Endocrinol., March 1, 2008; 196(3): 601 - 613. [Abstract] [Full Text] [PDF]
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M. Takeda, F. Otsuka, H. Otani, K. Inagaki, T. Miyoshi, J. Suzuki, Y. Mimura, T. Ogura, and H. Makino Effects of peroxisome proliferator-activated receptor activation on gonadotropin transcription and cell mitosis induced by bone morphogenetic proteins in mouse gonadotrope L{beta}T2 cells J. Endocrinol., July 1, 2007; 194(1): 87 - 99. [Abstract] [Full Text] [PDF]
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 H. Otani, F. Otsuka, K. Inagaki, M. Takeda, T. Miyoshi, J. Suzuki, T. Mukai, T. Ogura, and H. Makino Antagonistic effects of bone morphogenetic protein-4 and -7 on renal mesangial cell proliferation induced by aldosterone through MAPK activation Am J Physiol Renal Physiol, May 1, 2007; 292(5): F1513 - F1525. [Abstract] [Full Text] [PDF]
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