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Altered Expression of novH Is Associated with Human Adrenocortical Tumorigenesis

INSERM, U-515, Croissance, Differenciation et Processus Tumoraux, Hôpital Saint-Antoine (C.M., C.G., M.L., Y.L.B.), 75571 Paris, France; Service d’Anatomo-Pathologie, Hôpital Cochin (A.L.), Assistance Publique-Hôpitaux de Paris, 75014 Paris, France; and Department of Anatomy, University of Cambridge (P.N.S.), Cambridge, United Kingdom

Address all correspondence and requests for reprints to: Dr. C. Martinerie, INSERM, U-515, Hôpital Saint-Antoine, 184 rue du Faubourg Saint-Antoine, 75571 Paris Cedex 12, France. E-mail: martiner{at}st-antoine.inserm.fr

Abstract

NOVH belongs to the CCN (CTGF/CYR61/NOV) family of proteins, some of which have chemotactic, mitogenic, adhesive, and angiogenic properties. Whereas ctgf and cyr61 are growth factor-inducible, immediate-early genes, nov is expressed in growth-arrested or quiescent cells. As nov expression has been shown to be altered in both avian and human nephroblastomas and to be a target of WT1 regulation, NOV may play important roles in normal nephrogenesis and the development of Wilms’ tumors.

The aim of this study was to determine whether changes in novH expression were associated with tumorigenesis in tissues other than those of the kidney. We showed by Northern blotting and immunohistochemistry that among human adult endocrine tissues, the adrenal gland is a major site of novH expression, and that in adult and fetal adrenal tissue, novH is primarily expressed in the adrenal cortex. Studies with 12 benign and 18 malignant adrenocortical tumors revealed that the levels of novH mRNA and protein decreased significantly (P < 0.004) with progression of adrenocortical tumors from a benign to a malignant state. Although the localization of NOVH did not change, the N-glycosylation profile of benign and malignant tumors differed considerably from that of normal adrenocortical tissue, and these differences may affect the biochemical properties of the molecule. The properties of NOVH here provide the first evidence that this member of the CCN family could be involved in adrenocortical tumor development.

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