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除染廃棄物の焼却灰 容積減らす新施設完成

福島県内の除染廃棄物を燃やして出る、汚染の程度が高い灰の容積を減らすための新しい施設が、福島第一原発の周辺にある中間貯蔵施設の用地に完成しました。

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CXCR4 downregulation of let-7a drives chemoresistance in acute myeloid leukemia.

著者 Chen Y , Jacamo R , Konopleva M , Garzon R , Croce C , Andreeff M
J Clin Invest.2013 May 8 ; ():.
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We examined the role of microRNAs (miRNAs) in targeting the stromal-derived factor 1α/CXCR4 (SDF-1α/CXCR4) axis to overcome chemoresistance of AML cells. Microarray analysis of OCI-AML3 cells revealed that the miRNA let-7a was downregulated by SDF-1α-mediated CXCR4 activation and increased by CXCR4 inhibition. Overexpression of let-7a in AML cell lines was associated with decreased c-Myc and BCL-XL protein expression and enhanced chemosensitivity, both in vitro and in vivo. We identified the transcription factor Yin Yang 1 (YY1) as a link between SDF-1α/CXCR4 signaling and let-7a, as YY1 was upregulated by SDF-1α and downregulated by treatment with a CXCR4 antagonist. ChIP assay confirmed the binding of YY1 to unprocessed let-7a DNA fragments, and treatment with YY1 shRNA increased let-7a expression. In primary human AML samples, high CXCR4 expression was associated with low let-7a levels. Xenografts of primary human AML cells engineered to overexpress let-7a exhibited enhanced sensitivity to cytarabine, resulting in greatly extended survival of immunodeficient mice. Based on these data, we propose that CXCR4 induces chemoresistance by downregulating let-7a to promote YY1-mediated transcriptional activation of MYC and BCLXL in AML cells.
PMID: 23676502 [PubMed - as supplied by publisher]
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