کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2039990 | 1073093 | 2016 | 9 صفحه PDF | دانلود رایگان |
• EGFR/PI3K signaling enhances miR-29 expression via upregulation of SCAP/SREBP-1
• SREBP-1 transcriptionally activates miR-29 expression via binding to its promoter
• miR-29 suppresses SCAP and SREBP-1 expression by interacting with their 3′ UTRs
• miR-29 transfection inhibits GBM growth in vivo via suppression of SCAP/SREBP-1
SummaryDysregulated lipid metabolism is a characteristic of malignancies. Sterol regulatory element binding protein 1 (SREBP-1), a transcription factor playing a central role in lipid metabolism, is highly activated in malignancies. Here, we unraveled a link between miR-29 and the SCAP (SREBP cleavage-activating protein)/SREBP-1 pathway in glioblastoma (GBM) growth. Epidermal growth factor receptor (EGFR) signaling enhances miR-29 expression in GBM cells via upregulation of SCAP/SREBP-1, and SREBP-1 activates miR-29 expression via binding to specific sites in its promoter. In turn, miR-29 inhibits SCAP and SREBP-1 expression by interacting with their 3′ UTRs. miR-29 transfection suppressed lipid synthesis and GBM cell growth, which were rescued by the addition of fatty acids or N-terminal SREBP-1 expression. Xenograft studies showed that miR-29 mimics significantly inhibit GBM growth and prolong the survival of GBM-bearing mice. Our study reveals a previously unrecognized negative feedback loop in SCAP/SREBP-1 signaling mediated by miR-29 and suggests that miR-29 treatment may represent an effective means to target GBM.
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Journal: - Volume 16, Issue 6, 9 August 2016, Pages 1527–1535