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• W2169383425 startingPage "1845" @default.
• W2169383425 abstract "Androgen receptor (AR) signaling is a key pathway modulating prostate cancer (PCa) progression. Several steps in this pathway have been investigated in order to propose novel treatment strategies for advanced PCa. Total osteopontin (OPN) has been described as a biomarker for PCa, in addition to its role in activating the progression of this tumor. Based on the known effects of the OPNc splice variant on PCa progression, the present study investigated whether this isoform can also modulate AR signaling. In order to test this, an in vitro model was used in which LNCaP cells were cultured in the presence of conditioned medium (CM) secreted by PCa cells overexpressing OPNc (OPNc‑CM). The activation of AR signaling was evaluated by measuring the expression levels of AR‑responsive genes (ARGs) using quantitative polymerase chain reaction and specific oligonucleotides. The data demonstrated that all nine tested ARGs (Fgf8, TMPRSS2, Greb1, Cdk2, Ndrg1, Cdk1, Pmepa1, Psa and Ar) are significantly upregulated in response to OPNc‑CM compared with LNCaP cells cultured in CM secreted by control cells transfected with empty expression vector. The specific involvement of OPNc was demonstrated by depleting OPNc from OPNc‑CM using an anti‑OPNc neutralizing antibody. In addition, by using a phosphoinositide 3-kinase (PI3K)‑specific inhibitor and AR antagonists, such as flutamide and bicalutamide, it was also observed that upregulation of ARGs in response to OPNc‑CM involves PI3K signaling and depends on the AR. In conclusion, these data indicated that OPNc is able to activate AR signaling through the PI3K pathway and the AR. These data further corroborate our previous data, revealing the OPNc splice variant to be a key molecule that is able to modulate key signaling pathways involved in PCa progression." @default.
• W2169383425 created "2016-06-24" @default.
• W2169383425 creator A5007744198 @default.
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• W2169383425 date "2015-02-06" @default.
• W2169383425 modified "2023-09-27" @default.
• W2169383425 title "Osteopontin-c mediates the upregulation of androgen responsive genes in LNCaP cells through PI3K/Akt and androgen receptor signaling" @default.
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• W2169383425 doi "https://doi.org/10.3892/ol.2015.2939" @default.
• W2169383425 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4356391" @default.
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