Abstract:For approximately a decade, chemotherapy has been shown to prolong life in patients with metastatic castration-resistant prostate cancer (mCRPC). Since that time, however, only two agents have proven to prolong life (docetaxel and cabazitaxel). However, in the last year, the addition of chemotherapy to primary hormonal therapy became a standard of care for high-volume castration-sensitive metastatic disease. Here I will review current prostate cancer chemotherapies, mechanisms of resistance to those therapies,… Show more
“…Although the clinical outcome has improved, most patients with advanced PCa treated with HT eventually relapse and they develop castration-resistant PCa (CRPC) [11,12]. CRPC could be treated with sipuleucel-T, docetaxel, cabazitaxel, or abiraterone acetate plus prednisone, which was shown to prolong the survival in patients; however, CRPC is generally incurable [10][11][12][13][14]. There is therefore an urgent need for novel therapeutic strategies for CRPC.…”
“…Although the clinical outcome has improved, most patients with advanced PCa treated with HT eventually relapse and they develop castration-resistant PCa (CRPC) [11,12]. CRPC could be treated with sipuleucel-T, docetaxel, cabazitaxel, or abiraterone acetate plus prednisone, which was shown to prolong the survival in patients; however, CRPC is generally incurable [10][11][12][13][14]. There is therefore an urgent need for novel therapeutic strategies for CRPC.…”
“…1, 2), an advanced form of prostate cancer that develops when the disease progresses after initial treatment with surgery and/or medical castration using androgen deprivation therapy (ADT). Docetaxel and cabazitaxel are 2 taxane chemotherapies that are approved for treatment of metastatic CRPC (3). Recent studies have reported benefits when docetaxel was combined with ADT during the hormone-sensitive stage of the disease (3,4).…”
Purpose: Targeted therapies that use the signaling pathways involved in prostate cancer are required to overcome chemoresistance and improve treatment outcomes for men. Molecular chaperones play a key role in the regulation of protein homeostasis and are potential targets for overcoming chemoresistance. Experimental Design: We established 4 chemoresistant prostate cancer cell lines and used image-based high-content siRNA functional screening, based on gene-expression signature, to explore mechanisms of chemoresistance and identify new potential targets with potential roles in taxane resistance. The functional role of a new target was assessed by in vitro and in vivo silencing, and mass spectrometry analysis was used to identify its downstream effectors. Results: We identified FKBP7, a prolyl-peptidyl isomerase overexpressed in docetaxel-resistant and in cabazitaxelresistant prostate cancer cells. This is the first study to characterize the function of human FKBP7 and explore its role in cancer. We discovered that FKBP7 was upregulated in human prostate cancers and its expression correlated with the recurrence observed in patients receiving docetaxel. FKBP7 silencing showed that FKBP7 is required to maintain the growth of chemoresistant cell lines and chemoresistant tumors in mice. Mass spectrometry analysis revealed that FKBP7 interacts with eIF4G, a component of the eIF4F translation initiation complex, to mediate the survival of chemoresistant cells. Using small-molecule inhibitors of eIF4A, the RNA helicase component of eIF4F, we were able to kill docetaxel-and cabazitaxelresistant cells. Conclusions: Targeting FKBP7 or the eIF4G-containing eIF4F translation initiation complex could be novel therapeutic strategies to eradicate taxane-resistant prostate cancer cells.
“…androgen deprivation therapy reduces tumor progression, relapse frequently occurs following surgical or chemical castration. Over a decade, docetaxel is the first-line systemic chemotherapy used for metastatic castration-resistant prostate cancer (mCRPC) (2).…”
Metastatic castration resistant prostate cancer (mCRPC) relapse due to acquired resistance to chemotherapy, such as docetaxel, remains a major threat to patient survival. Resistance of mCRPC to docetaxel can be associated with elevated levels of soluble clusterin (sCLU) and growth differentiation factor-15 (GDF-15). Any strategies aiming to modulate sCLU and/or GDF-15 in docetaxel-resistant prostate cancer cells present a therapeutic interest. The present study reports the cytotoxic effect of a nitric oxide donor, glyceryl trinitrate (GTN), on docetaxel-resistant mCRPC human cell lines and demonstrates that GTN displays greater inhibition of cell viability toward docetaxel-resistant mCRPC cells than on mCRPC cells. It is also demonstrated that GTN modulates the level of expression of clusterin (CLU) which is dependent of GDF-15, two markers associated with docetaxel resistance in prostate cancer. The results indicate that GTN represses the level of expression of the cytoprotective isoform of CLU (sCLU) and can increase the level of expression of the cytotoxic isoform (nuclear CLU) in docetaxel resistant cells. Furthermore, it was observed that GTN differentially regulates the level of the precursor form of GDF-15 between resistant and parental cells, and that recombinant GDF-15 can modulate the expression of CLU isoforms and counteract GTN-induced cytotoxicity in resistant cells. A link was established between GDF-15 and the expression of CLU isoforms. The present study thus revealed GTN as a potential therapeutic strategy to overcome docetaxel-resistant mCRPC.
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