Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA116507 | ENA |
REPOSITORIES: ENA
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Project description:MicroRNAs (miRNAs) influence cancer development through post-transcriptional negative regulation of both tumor suppressors and oncogenes. We subjected melanoma cell lines, normal melanocytes, and keratinocytes to array based miRNA profiling, and identified several distinct miRNAs with differential expression. Specifically, miR-211 levels were depleted in all eight melanoma cell lines examined, and also in 23 of 30 distinct patient melanoma samples (graded as primary in situ, regional metastatic, distant metastatic and nodal metastatic). Putative target genes of miR-211 were identified, and their anticipated increased expression levels were confirmed in melanoma cell lines, which were reduced in two melanoma cell lines that artificially over-expressed miR-211. Four such target genes (TCF12, RAB22A, KCNMA1 and SLC37A3) were confirmed by a target cleavage assay. Stable over-expression of miR-211 in two melanoma cell lines caused significant growth inhibition and reduced invasiveness. The differential expression of miR-211 in a variety of melanoma cell lines and clinical samples, consistent inverse correlation between miR-211 and its target mRNA levels, and growth retardation and reduced invasiveness of melanoma cell lines by miR-211 are all consistent with the idea that the depletion of miR-211 is a key step in melanoma development and/or progression The 15 Samples in this submission represent gene-level expression profiling of isolated total RNA from WM1552C, WM1552+miRNA211, A375, A375+miRNA211 and melanocytes hybridized to Affymetrix exon ararys.
2010-05-20 | E-GEOD-15281 | biostudies-arrayexpress
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2013-03-31 | E-GEOD-43962 | biostudies-arrayexpress
Project description:Purpose:To indentify downtream effectors of JMJD3, we performed microarray profiling in vector- or JMJD3-expressing A375-LM3 and those in freshly isolated melanoma cells from tumors formed by aforementioned cell lines Results: we identifed 31 genes whose expression increased in WT JMJD3 expression cells at least by over 1.5-fold.
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Project description:To discover potential biomarkers of melanoma development and progression, we embarked on studies comparing the glycomic gene profiles of normal human epidermal melanocytes with human metastatic melanoma (MM) cells represented by A375 and G361 cell lines. Glycomic features embody all of those enzymatic, membranous and regulatory proteins that influence glycan ‘sugar’ formation/degradation on a cell. Comparative expression profiling of glycomic genes indicated that several genes were differentially expressed between normal melanocytes and MM cells. We speculate that glycome genes differentially expressed in MM cells help drive malignant and metastatic behavior of MM cells and could potentially serve as a biomarker(s) of melanoma progression.
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Project description:Super-enhancers (SEs) are large genomic regions with high density of enhancer marks. In cancer, SEs are found near oncogenes and dictate cancer gene expression. However, how oncogenic SEs are regulated remains poorly understood. Here, we show that INO80, a chromatin remodeling complex, is required for SE-mediated oncogenic transcription and tumor growth in melanoma. The expression of Ino80, the SWI/SNF ATPase, is elevated in melanoma cells and patient melanomas compared to normal melanocytes and benign nevi. Furthermore, Ino80 silencing selectively inhibits melanoma cell proliferation, anchorage-independent growth, as well as tumorigenesis and tumor maintenance in mouse xenografts. Mechanistically, Ino80 occupies more than 90% of SEs, and its occupancy is dependent on transcription factors such as MITF and Sox9. Ino80 binding reduces nucleosome occupancy and facilitates Mediator recruitment, thus promoting oncogenic transcription. Consistently, genes co-occupied by Ino80 and Med1 are specifically expressed in melanomas compared to melanocytes. Together, our results reveal an essential role of INO80-dependent chromatin remodeling in SE function, and suggest a novel strategy for disrupting SEs in cancer treatment. Human melanoma cell line A375 cells were infected with shNT or shIno80, and total RNA was extracted 2, 3, 4 days after infection. The RNA was submitted to RNA-Seq subsequently. For ChIP-Seq, either wild type A375 and SK-MEL-147, or A375 infected with shNT or shIno80, was used for ChIP-Seq for corresponding factors.
2016-07-07 | E-GEOD-82333 | biostudies-arrayexpress
Project description:Super-enhancers (SEs) are large genomic regions with high density of enhancer marks. In cancer, SEs are found near oncogenes and dictate cancer gene expression. However, how oncogenic SEs are regulated remains poorly understood. Here, we show that INO80, a chromatin remodeling complex, is required for SE-mediated oncogenic transcription and tumor growth in melanoma. The expression of Ino80, the SWI/SNF ATPase, is elevated in melanoma cells and patient melanomas compared to normal melanocytes and benign nevi. Furthermore, Ino80 silencing selectively inhibits melanoma cell proliferation, anchorage-independent growth, as well as tumorigenesis and tumor maintenance in mouse xenografts. Mechanistically, Ino80 occupies more than 90% of SEs, and its occupancy is dependent on transcription factors such as MITF and Sox9. Ino80 binding reduces nucleosome occupancy and facilitates Mediator recruitment, thus promoting oncogenic transcription. Consistently, genes co-occupied by Ino80 and Med1 are specifically expressed in melanomas compared to melanocytes. Together, our results reveal an essential role of INO80-dependent chromatin remodeling in SE function, and suggest a novel strategy for disrupting SEs in cancer treatment. Human melanoma cell line A375 cells were infected with shNT or shIno80, and total RNA was extracted 2, 3, 4 days after infection. The RNA was submitted to RNA-Seq subsequently. For ChIP-Seq, either wild type A375 and SK-MEL-147, or A375 infected with shNT or shIno80, was used for ChIP-Seq for corresponding factors.
2016-07-07 | E-GEOD-82330 | biostudies-arrayexpress
Project description:Super-enhancers (SEs) are large genomic regions with high density of enhancer marks. In cancer, SEs are found near oncogenes and dictate cancer gene expression. However, how oncogenic SEs are regulated remains poorly understood. Here, we show that INO80, a chromatin remodeling complex, is required for SE-mediated oncogenic transcription and tumor growth in melanoma. The expression of Ino80, the SWI/SNF ATPase, is elevated in melanoma cells and patient melanomas compared to normal melanocytes and benign nevi. Furthermore, Ino80 silencing selectively inhibits melanoma cell proliferation, anchorage-independent growth, as well as tumorigenesis and tumor maintenance in mouse xenografts. Mechanistically, Ino80 occupies more than 90% of SEs, and its occupancy is dependent on transcription factors such as MITF and Sox9. Ino80 binding reduces nucleosome occupancy and facilitates Mediator recruitment, thus promoting oncogenic transcription. Consistently, genes co-occupied by Ino80 and Med1 are specifically expressed in melanomas compared to melanocytes. Together, our results reveal an essential role of INO80-dependent chromatin remodeling in SE function, and suggest a novel strategy for disrupting SEs in cancer treatment. Human melanoma cell line A375 cells were infected with shNT or shIno80, and total RNA was extracted 2, 3, 4 days after infection. The RNA was submitted to RNA-Seq subsequently. For ChIP-Seq, either wild type A375 and SK-MEL-147, or A375 infected with shNT or shIno80, was used for ChIP-Seq for corresponding factors.
2016-07-07 | E-GEOD-82331 | biostudies-arrayexpress
Project description:Super-enhancers (SEs) are large genomic regions with high density of enhancer marks. In cancer, SEs are found near oncogenes and dictate cancer gene expression. However, how oncogenic SEs are regulated remains poorly understood. Here, we show that INO80, a chromatin remodeling complex, is required for SE-mediated oncogenic transcription and tumor growth in melanoma. The expression of Ino80, the SWI/SNF ATPase, is elevated in melanoma cells and patient melanomas compared to normal melanocytes and benign nevi. Furthermore, Ino80 silencing selectively inhibits melanoma cell proliferation, anchorage-independent growth, as well as tumorigenesis and tumor maintenance in mouse xenografts. Mechanistically, Ino80 occupies more than 90% of SEs, and its occupancy is dependent on transcription factors such as MITF and Sox9. Ino80 binding reduces nucleosome occupancy and facilitates Mediator recruitment, thus promoting oncogenic transcription. Consistently, genes co-occupied by Ino80 and Med1 are specifically expressed in melanomas compared to melanocytes. Together, our results reveal an essential role of INO80-dependent chromatin remodeling in SE function, and suggest a novel strategy for disrupting SEs in cancer treatment. Human melanoma cell line A375 cells were infected with shNT or shIno80, and total RNA was extracted 2, 3, 4 days after infection. The RNA was submitted to RNA-Seq subsequently. For ChIP-Seq, either wild type A375 and SK-MEL-147, or A375 infected with shNT or shIno80, was used for ChIP-Seq for corresponding factors.
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