Human DECR1 is an androgen-repressed survival factor that regulates PUFA oxidation to protect prostate tumor cells from ferroptosis.
Zeyad D NassarChui Yan MahJonas DehairsIngrid Jg BurvenichSwati IraniMargaret M CenteneraMadison HelmRaj K ShresthaMax MoldovanAnthony S DonJeff HolstAndrew M ScottLisa G HorvathDavid J LynnLuke A SelthAndrew J HoyJohannes V SwinnenLisa M ButlerPublished in: eLife (2020)
Fatty acid β-oxidation (FAO) is the main bioenergetic pathway in human prostate cancer (PCa) and a promising novel therapeutic vulnerability. Here we demonstrate therapeutic efficacy of targeting FAO in clinical prostate tumors cultured ex vivo, and identify DECR1, encoding the rate-limiting enzyme for oxidation of polyunsaturated fatty acids (PUFAs), as robustly overexpressed in PCa tissues and associated with shorter relapse-free survival. DECR1 is a negatively-regulated androgen receptor (AR) target gene and, therefore, may promote PCa cell survival and resistance to AR targeting therapeutics. DECR1 knockdown selectively inhibited β-oxidation of PUFAs, inhibited proliferation and migration of PCa cells, including treatment resistant lines, and suppressed tumor cell proliferation and metastasis in mouse xenograft models. Mechanistically, targeting of DECR1 caused cellular accumulation of PUFAs, enhanced mitochondrial oxidative stress and lipid peroxidation, and induced ferroptosis. These findings implicate PUFA oxidation via DECR1 as an unexplored facet of FAO that promotes survival of PCa cells.
Keyphrases
- free survival
- prostate cancer
- induced apoptosis
- oxidative stress
- endothelial cells
- hydrogen peroxide
- cell cycle arrest
- cell death
- fatty acid
- cell proliferation
- cancer therapy
- radical prostatectomy
- high glucose
- endoplasmic reticulum stress
- electron transfer
- induced pluripotent stem cells
- climate change
- dna damage
- gene expression
- visible light
- nitric oxide
- small molecule
- transcription factor
- copy number
- genome wide
- pi k akt
- ischemia reperfusion injury
- dna methylation
- drug induced
- heat stress