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• W1991630894 abstract "Dopamine agonists (DAs) are the first-line treatment for prolactinomas, which account for 25–30% of functioning pituitary adenomas, and bromocriptine (BRC) is the only commercially available DAs in China. However, tumors are resistant to therapy in 5–18% of patients. The exomes of six responsive prolactinomas and six resistant prolactinomas were analyzed by whole-exome sequencing. Using stringent variant calling and filtering parameters, ten somatic variants that were mainly associated with DNA repair or protein metabolic processes were identified. New resistant variants were identified in multiple genes including PRDM2, PRG4, MUC4, DSPP, DPCR1, RP1L1, MX2, POTEF, C1orf170, and KRTAP10-3. The expression of these genes was then quantified by real-time reverse-transcription PCR (RT–qPCR) in 12 prolactinomas and 3 normal pituitary glands. The mRNA levels of PRDM2 were approximately five-fold lower in resistant prolactinomas than in responsive tumors (p < 0.05). PRDM2 protein levels were lower in resistant prolactinomas than in responsive tumors, as determined by Western blotting and immunohistochemical analysis (p < 0.05). Overexpression of PRDM2 upregulated dopamine receptor D2 (D2DR) and inhibited the phosphorylation of ERK1/2 in MMQ cells. PRDM2 showed a synergistic effect with BRC on the inhibition of prolactin (PRL) secretion and MMQ cell viability, and low PRDM2 expression was associated with tumor recurrence. PRDM2 downregulation may play a role in dopamine-agonist resistance and tumor recurrence in prolactinomas." @default.
• W1991630894 created "2016-06-24" @default.
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• W1991630894 date "2015-04-12" @default.
• W1991630894 modified "2023-10-17" @default.
• W1991630894 title "Lower PRDM2 expression is associated with dopamine-agonist resistance and tumor recurrence in prolactinomas" @default.
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• W1991630894 doi "https://doi.org/10.1186/s12885-015-1267-0" @default.
• W1991630894 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4407330" @default.
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