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Originally published In Press as doi:10.1074/jbc.M107946200 on December 10, 2001

J. Biol. Chem., Vol. 277, Issue 7, 5529-5540, February 15, 2002
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Distinct Interaction of Cortivazol with the Ligand Binding Domain Confers Glucocorticoid Receptor Specificity
CORTIVAZOL IS A SPECIFIC LIGAND FOR THE GLUCOCORTICOID RECEPTOR*

Noritada YoshikawaDagger §, Yuichi MakinoDagger , Kensaku Okamoto§, Chikao MorimotoDagger , Isao Makino§, and Hirotoshi TanakaDagger

From the Dagger  Division of Clinical Immunology, Advanced Clinical Research Center, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639 and § Second Department of Internal Medicine, Asahikawa Medical College, 2-1-1 Midorigaoka-higashi, Asahikawa 078-0083, Japan

Ligand-receptor coupling is one of the important constituents of signal transduction and is essential for physiological transmission of actions of endogenous substances including steroid hormones. However, molecular mechanisms of the redundancy between glucocorticoid and mineralocorticoid actions remain unknown because of complicated cross-talk among, for example, these adrenal steroids, their cognate receptors, and target genes. Receptor-specific ligand that can distinctly modulate target gene expression should be developed to overcome this issue. In this report, we showed that a pyrazolosteroid cortivazol (CVZ) does not induce either nuclear translocation or transactivation function of the mineralocorticoid receptor (MR) but does both for the glucocorticoid receptor (GR). Moreover, deletion analysis of the C-terminal end of the GR has revealed that CVZ interacts with the distinct portion of the ligand binding domain (LBD) and differentially modulates the ligand-dependent interaction between transcription intermediary factor 2 and the LBD when compared with cortisol, dexamethasone, and aldosterone. Thus, it is indicated that CVZ may not be only a molecular probe for the analysis of the redundancy between the GR and MR in vivo but also a useful reagent to clarify structure-function relationship of the GR LBD.

* This work was supported in part by the grants from the Ministry of Education, Science, Technology, Sports, and Culture, the Ministry of Health, Labor, and Welfare, the Takeda Science Foundation, Suzuken Memorial Foundation, and the Cell Science Research Foundation.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

To whom correspondence should be addressed: Division of Clinical Immunology, Advanced Clinical Research Center, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan. Tel./Fax: 81-3-5449-5547; E-mail: hirotnk@ims.u-tokyo.ac.jp.

Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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