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MiR-200b is associated with cisplatin sensitivity in bladder cancer cells

ABSTRACT: We aimed to clarify the role of miR-200b in cisplatin (CDDP) sensitivity in bladder cancer (BCa). CDDP resistant T24 cells (T24RC) were transfected with a miR mimic negative control (NC) or a miR-200b mimic, after which cells were treated with or without CDDP. We found that ectopic miR-200b expression re-sensitized the T24RC cells to CDDP. Gene expression microarray analysis revealed that the combination of miR-200b and CDDP affected genes involved in CDDP sensitivity and cytotoxicity.

ORGANISM(S): Homo sapiens

PROVIDER: GSE103250 | GEO | 2018/05/31

REPOSITORIES: GEO

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Project description:MiRNA molecules are important post-transcriptional regulators of gene expression in the brain function. Altered miRNA profiles could represent a defensive response against the pathogenesis of neurodegenerative disorders, such as Alzheimer's disease (AD). Endogenous miRNAs have lower toxic effects than other gene silencing methods, thus enhancing the expression of defensive miRNA could be an effective therapy. However, little is known about the potential of targeting miRNAs for the treatment of AD. Here, we examined the function of the miR-200 family (miR-200a, -141, -429, -200b, -200c), identified using miRNA microarray analysis of cortical tissue from Tg2576 transgenic mice. In murine primary neurons, we found that upregulation of miR-200b or -200c was induced by the addition of amyloid beta (Aβ). Neurons transfected with miR-200b or -200c reduced secretion of Aβ in conditioned medium. Moreover, mice infused with miR-200b/c into the brain were relieved of memory impairments induced by intracerebroventricular injection of oligomeric Aβ, and demonstrated proper spatial learning in the Barnes maze. To gain further understanding of the relationship between miR-200b/c and Aβ, we identified target mRNAs via an RNA-binding protein immunoprecipitation-microarray assay. Western blot analysis showed that expression of ribosomal protein S6 kinase B1 (S6K1), a candidate target, was inhibited by miR-200c. S6K1, a downstream effector of mammalian target of rapamycin (mTOR), serves as a negative feedback mediator that phosphorylates insulin receptor substrate 1 at serine residues (IRS-1pSer). S6K1-dependent IRS-1pSer suppresses insulin signaling leading to insulin resistance, which is frequently observed in AD brains. Notably, miR-200b/c transfection of SH-SY5Y cells reduced the levels of IRS-1pSer. This finding indicates that miR-200b/c has the potential to alleviate insulin resistance via modulation of S6K1. Taken together, miR-200b/c may contribute to reduce Aβ secretion and Aβ-induced cognitive impairment by promoting insulin signaling.

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MiR-200b is associated with cisplatin sensitivity in bladder cancer cells

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