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Molecular and Cellular Biology, June 2003, p. 3951-3964, Vol. 23, No. 11
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.11.3951-3964.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Activin Induces x-Zone Apoptosis That Inhibits Luteinizing Hormone-Dependent Adrenocortical Tumor Formation in Inhibin-Deficient Mice

Felix Beuschlein,1 Brendan D. Looyenga,1 Stephanie E. Bleasdale,1 Chris Mutch,1 David L. Bavers,1 Albert F. Parlow,2 John H. Nilson,3 and Gary D. Hammer1*

Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan,1 National Hormone and Pituitary Program, Harbor-University of California—Los Angeles Medical Center, Torrance, California,2 Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio3

Received 14 November 2002/ Returned for modification 13 January 2003/ Accepted 17 March 2003

Inhibin and activin are members of the transforming growth factor ß (TGF-ß) family of ligands produced and secreted primarily by the gonads and adrenals. Inhibin-null (INH-/-) mice develop gonadal tumors and—when gonadectomized—adrenocortical carcinoma. The mechanisms leading to adrenal tumorigenesis have been proposed to involve the lack of a gonadal factor and/or a compensatory increase in gonadotropins. In order to achieve elevation of gonadotropins without the concomitant loss of a gonadal hormone, we crossed INH-/- mice with a transgenic mouse strain that has chronically elevated luteinizing hormone (LH) levels (LH-CTP). Compound INH-/--LH-CTP mice die within 6 weeks of age from severe cancer cachexia induced by large, activin-secreting ovarian tumors. Unexpectedly, INH-/--LH-CTP mice not only fail to develop adrenal tumors but have smaller adrenals, with a regressed x zone, indicating that elevated LH levels are not sufficient to induce adrenal tumor formation. However, following gonadectomy, INH-/--LH-CTP mice develop large, sex steroid-producing adrenal tumors that arise from the x zone, indicating a growth-promoting effect of high levels of LH on the adrenal cortex in the absence of ovarian tumors. In addition, in vivo and in vitro data indicate that activin induces apoptosis specifically in the adrenal x zone. The restricted expression of activin receptor subunits and Smad2 in cells of the adrenal x zone, together with the elevated activin levels in INH-/--LH-CTP mice, supports the conclusion that activin inhibits adrenal tumor growth by inducing x-zone regression.

* Corresponding author. Mailing address: Division of Endocrinology and Metabolism, Department of Internal Medicine, 5560A MSRB II, 1150 W. Medical Center Dr., University of Michigan, Ann Arbor, MI 48109-0678. Phone: (734) 936-5033. Fax: (734) 936-6684. E-mail: ghammer{at}umich.edu.

Molecular and Cellular Biology, June 2003, p. 3951-3964, Vol. 23, No. 11
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.11.3951-3964.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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