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Prostate cancer is one of the most common types of cancer in men and the leading cause of death in developed countries. With the aid of molecular and genetic profiling of cancers, cancer molecular subtypes are paving the way for tailored cancer therapy. FOXA1 has been identified as one of the seven molecular subtypes of prostate cancer. FOXA1 is involved in a variety of metabolic process such as glucose homeostasis and deregulation of its expression is crucial in prostate cancer progression. In this study, we investigated the effects of FOXA1 gene knock-out on the expression levels of various cancer cell metabolism and cell cycle-related protein expressions. FOXA1 gene was knocked-out by using CRISPR/Cas9 technique. While FOXA1 gene knock-out significantly altered Casp-9, Bax, CCND1, CDK4, and fibronectin protein expressions (P &lt; 0.05, fold change: ∼40, 4.5, 2.5, 4.5, and 4, respectively), it did not affect the protein expression levels of Casp-3, Bcl-2, survivin, β-catenin, c-Myc, and GSK-3B. Knocking-out FOXA1 gene in androgen-dependent LNCaP prostate cancer cells inhibited CCND1 protein expression. Our pre-clinical results demonstrate the importance of FOXA1 as a drug target in the treatment of prostate cancer. Impact statement Knock-out studies offer a unique way of studying the function of genes especially for developmentally lethal genes. FOXA1 has prominent roles both in breast and prostate cancer pathogenesis due to its role in ER receptor signaling pathway. FOXA1 has also been identified as one of the seven molecular subtypes of primary prostate cancer. In the present study, we used an efficient gene knock-out method, CRISPR/Cas9, in order to investigate FOXA1 function on LNCaP prostate cancer cells in vitro. FOXA1 knock-out altered cell-cycle regulator CCND1 protein expression levels. Therefore, our results suggest that FOXA1 might be a plausible drug target for prostate cancer treatment.

FOXA1 knock-out via CRISPR/Cas9 altered Casp-9, Bax, CCND1, CDK4, and fibronectin expressions in LNCaP cells