Metabolic Sabotage of the Vitamin D Axis: Transcriptomic Rewiring of CYP24A1 and CYP27A1 Drives Endocrine Resistance in Castration-Resistant Prostate Cancer
Öz
Prostate cancer frequently progresses to an aggressive, castration-resistant (CRPC) stage with limited therapeutic options. Despite the tumor-suppressive potential of active Vitamin D (calcitriol), CRPC clinical trials have yielded disappointing results, suggesting tumors possess specialized evasion mechanisms. This study investigates whether this resistance is driven by genomic mutations or dynamic metabolic rewiring. We performed targeted transcriptomic profiling of the core Vitamin D signaling network, comparing normal prostate epithelial cells (RWPE-1) with metastatic CRPC cells (PC3). We also conducted an Over-Representation Analysis (ORA) targeting lipid and steroid metabolic networks. Clinical relevance was validated using the TCGA Prostate Adenocarcinoma cohort. This validation revealed that structural genomic alterations across the Vitamin D network are exceedingly rare (mutation frequencies ≤1.4% for VDR, CYP24A1, CYP27A1, and CDKN1A). Instead, in vitro analysis demonstrated that aggressive cells utilize dynamic transcriptomic rewiring to construct a "metabolic barrier." While maintaining a stable Vitamin D Receptor (VDR) profile, PC3 cells synchronously suppress the biosynthetic enzyme CYP27A1 and upregulate the catabolic enzyme CYP24A1. Furthermore, ORA highlighted significant enrichment of altered lipid and steroid metabolic networks. Ultimately, CRPC evades Vitamin D suppression through a non-mutational "metabolic sabotage" strategy, actively starving the intact receptor of its ligand via a highly restrictive catabolic microenvironment. Overcoming this endocrine resistance likely requires combining Vitamin D therapies with potent catabolic inhibitors.
Anahtar Kelimeler
- Prostate Adenocarcinoma
- Androgen-Independent
- Vitamin D Axis
- Metabolic Sabotage
- Transcriptomic Rewiring
Destekleyen Kurum
Proje Numarası
Etik Beyan
Teşekkür
Kaynakça
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Ayrıntılar
Birincil Dil
İngilizce
Konular
Üroloji
Bölüm
Araştırma Makalesi
Yayımlanma Tarihi
22 Eylül 2026
Gönderilme Tarihi
18 Haziran 2026
Kabul Tarihi
24 Ağustos 2026
Yayımlandığı Sayı
Yıl 2026 Cilt: 48 Sayı: 6