University of Veterinary Medicine Vienna Thyroid hormone receptor beta signaling is a targetable driver of prostate cancer growth Thyroid hormone (TH) signaling plays a major role in the development, energy homeostasis, and metabolism of most tissues. Recent studies have identified THs as drivers of prostate cancer (PCa) development and progression. We reported that the T3-scavenger protein µ-crystallin (CRYM) regulates the development and progression of PCa and that this involved crosstalk with androgen receptor (AR) signaling. However, the mechanisms remain incompletely understood. Here, we explored the role of thyroid hormone receptor β (TRβ), which is the main effector of TH signaling, in the context of PCa. The use of the TRβ-selective antagonist NH-3 inhibited PCa cell proliferation in vitro and reduced tumor size in PCa xenograft models in vivo. Notably, NH-3 was highly effective in the engrafted 22Rv1 cell line, a model for castration-resistant PCa (CRPC). Mechanistic studies revealed that NH-3 downregulates AR and the AR target genes Nkx3.1 and KLK3 (PSA). NH-3 was a more effective anticancer agent than enzalutamide, and their combined use was synergistic. Evidence from human datasets corroborates our findings, whereby elevated TRβ expression and mutations in the TH signaling pathway are associated with the onset of PCa. Collectively, these results establish TRβ as a mediator of tumorigenesis in PCa and identify NH-3 as a promising therapeutic agent for targeting AR signaling, particularly in CRPC. en TEXT journal article Wissenschaftlicher Artikel Articolo scientifico Text journal article Documento PDF Articolo scientifico Text Wissenschaftlicher Artikel Thyroid Hormone Receptor β Prostate Cancer NH-3 Androgen Receptor Murine PCa Model 2025 2025 Aleksandra Fesiuk Daniel Pölöske Elvin D. de Araujo Geordon A. Frere Timothy B. Wright Gary Tin Yasir S. Raouf Olasunkanmi O. Olaoye Ji Sung Park Nicolas Blavet Boris Tichý Michaela Schlederer Sandra Högler Michael Wolf Cécile Philippe Osman Aksoy Adam Varady Alejandro Medaglia Mata Maxim Varenicja Boglárka Szabó Theresa Weiss Gabriel Wasinger Torben Redmer Heidi A. Neubauer Martin Susani Clemens P. Spielvogel Jing Ning Maik Dahlhoff Martin Schepelmann Richard Kennedy Richard Moriggl Geoffrey Brown Jenny Persson Christopher Gerner Vojtech Bystry Oldamur Hollóczki David M. Heery Patrick T. Gunning Olaf Merkel Brigitte Hantusch Lukas Kenner Aleksandra Fesiuk Springer