Abstract
Androgen deprivation therapy (ADT) remains a key approach in the treatment of prostate cancer (PCa). However, PCa inevitably relapses and becomes ADT resistant. Besides androgens, there is evidence that thyroid hormone thyroxine (T4) and its active form 3,5,3’-triiodo-L-thyronine (T3) are involved in the progression of PCa. Epidemiologic evidence indicates a higher incidence of PCa in men with elevated thyroid hormone levels. The thyroid hormone binding protein μ-Crystallin (CRYM) mediates intracellular thyroid hormone action by sequestering T3 and blocks its binding to cognate receptors (TRa/TRb) in target tissues. We show in this study that low CRYM expression levels in PCa patient samples are associated with early BCR and poor prognosis. Moreover, we found a disease stage-specific expression of CRYM in PCa. CRYM counteracted thyroid and androgen signaling and blocked intracellular choline uptake. CRYM inversely correlated with [18F]fluoromethylcholine (FMC) levels in PET/MRI imaging of PCa patients. Our data suggest CRYM as a novel antagonist of T3 and androgen-mediated signalling. The role of CRYM could therefore be an essential control mechanism for the prevention of aggressive PCa growth.
Highlights
Thyroid and androgen hormone driven pathways in prostate cancer (PCa) are antagonized by μ- Crystallin (CRYM).
[18F]fluoromethylcholine uptake and prognostic values in PCa correlate with CRYM protein levels.
Reduced CRYM expression predicts early biochemical recurrence (BCR) in PCa patients.
Footnotes
↵20 Lead Contact
Conflict of interest statement: The authors declare no conflict of interest regarding the work presented in this study.
https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE101525