Cancer-Specific Loss of Urocortin 3 in Human Renal Cancer.

The corticotropin-releasing hormone (CRH) system, its receptors corticotropin-releasing hormone receptor 1 (CRHR1) and 2 (CRHR2), and its corresponding binding protein corticotropin-releasing hormone-binding protein (CRHBP) as well as the urocortin proteins-structural homologues to CRH, which are included in this peptide family-have become interesting oncological targets recently. Carcinogenesis of various human tumors has been reported with an altered presence of members of this system. The aim of the present study was to examine the role of urocortin 3 (UCN3) in renal cell carcinoma (RCC).

Therefore, tumoral tissues of 106 patients with RCC and available corresponding normal tissues were analyzed using qPCR for quantitative mRNA expression analysis. Tissue localization and protein signals of UCN3 in normal and tumoral renal specimens were evaluated using western blot and immunohistochemistry. In addition, correlation studies of UCN3 mRNA expression with clinicopathological parameters of patients with RCC and different histological subtypes were evaluated.

UCN3 mRNA was significantly downregulated in nearly all tumoral tissues (p = 7.92 × 10-13). The same effect was observed at protein level using immunohistochemistry. Level of UCN3 mRNA expression was not directly correlated with clinicopathological parameters.

We report for the first time the significant downregulation of UCN3 in RCC. These results demonstrate a possible involvement of the CRH system and its significance in carcinogenesis of RCC.

Advances in therapy. 2019 Nov 13 [Epub ahead of print]

Pouriya Faraj Tabrizi, Anahit Mohebbi Tafrechi, Inga Peters, Faranaz Atschekzei, Markus Antonius Kuczyk, Jürgen Serth, Hossein Tezval

Department of Urology and Urological Oncology, Hannover Medical School, Hannover, Germany., Department of Psychosomatic Medicine and Psychotherapy, University Medicine Göttingen, Göttingen, Germany., Department of Clinical Immunology and Rheumatology, Hannover Medical School, Hannover, Germany., Department of Urology and Urological Oncology, Hannover Medical School, Hannover, Germany. .