Identification of miR-145 or miR-133a target genes in squamous cell carcinoma
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE20028 | GEO | 2010/01/26
SECONDARY ACCESSION(S): PRJNA124113
REPOSITORIES: GEO
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Project description:We recently identified a subset of down-regulated miRNAs such as miR-145 and miR-133a in bladder cancer. Cell growth inhibitions occurred in miR-145 and miR-133a transfectants compared with the controls, suggesting that both miRNAs function as tumor suppressors. The aims of our expression studies were identification of these miRNAs target genes.
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Project description:miR-145 is downregulated in multiple cancers. The introduction of miR-145 could alleviate the tumor burden in the pancreatic cancer mouse model. However, how miR-145 mediates the tumor suppression is still an open question. In this study, we aimed to identify the targets of miR-145 using a SILAC approach.
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Project description:miR-145 is a tumor suppressor miRNA in various malignancies including pancreatic cancer. How miR-145 regulates expression of other miRNAs could provide a panoramic view of the development of pancreatic cancer. Therefore, in this project, we aimed to characterize how other miRNAs are affected by miR-145 in hope for understanding proteomic changes that are not explained by miR-145 alone.
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Project description:Through small RNA sequencing, we finded that a total of 8 miRNAs, including miR-133a-3p and miR-1a-3p cluster, showed differential expression after guanidineacetic acid supplement. To further study the function of miR-133a-3p and miR-1a-3p in guanidineacetic acid induce myotube hypertrophy, we transfected miR-133a-3p and miR-1a-3p mimics, that also induce myotube hypertrophy. Through bioinformatics and dual-luciferase reporter system, the target gene of miR-133a-3p and miR-1a-3p were respectively determined. Meanwhile, miR-133a-3p and miR-1a-3p modulate PI3K-Akt-mTOR signaling pathway by restraining target gene expression.
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Project description:miR-145 is a tumor suppressor miRNA in various malignancies including pancreatic cancer. How miR-145 regulates expression of other miRNAs could provide a panoramic view of the development of pancreatic cancer. Therefore, in this project, we aimed to characterize how other miRNAs are affected by miR-145 in hope for understanding proteomic changes that are not explained by miR-145 alone. miRNA microarray was used to compare expression of all miRNAs 48 hr after transfection of miR-145 mimics or control scramble RNA in a pancreatic cancer cell line, Mia-PaCa2.
2013-03-19 | E-GEOD-45246 | biostudies-arrayexpress
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Project description:Liposarcomas are rare, heterogeneous and malignant tumors that can be divided into five histological subtypes with different characteristics and clinical behavior. Treatment consists of surgery in combination with systemic chemotherapy, but nevertheless mortality rates are high. More insight into the biology of liposarcoma tumorigenesis is needed to devise novel therapeutic approaches. MicroRNAs (miRNAs) have been associated with carcinogenesis in many tumors and may function as tumor suppressor or oncogene. In this study we examined miRNA expression in an initial series of 57 human liposarcomas (including all subtypes), lipomas and normal fat by miRNA microarrays. Supervised hierarchical clustering of the most differentially expressed miRNAs (p<0.0002) distinguished most liposarcoma subtypes and control tissues. The distinction between well differentiated liposarcomas and benign lipomas was blurred, suggesting these tumor types may represent a biological continuum. MiRNA signatures of liposarcoma subtypes were established and validated in an independent series of 58 liposarcomas and control tissues. The expression of the miR-143/145 and miR-144/451 cluster members was clearly reduced in liposarcomas compared to normal fat. Overexpression of miR-145 and miR-451 in liposarcoma cell lines decreased cellular proliferation rate, impaired cell cycle progression and induced apoptosis. In conclusion, we show that miRNA expression profiling can be used to discriminate liposarcoma subtypes, which could aid in objective diagnostic decision making. In addition, our data indicate that miR-145 and miR-451 act as tumor suppressors in adipose tissue and show that re-expression of these miRNAs could be a promising therapeutic strategy for liposarcomas.
2014-03-01 | GSE45359 | GEO
Project description:Liposarcomas are rare, heterogeneous and malignant tumors that can be divided into five histological subtypes with different characteristics and clinical behavior. Treatment consists of surgery in combination with systemic chemotherapy, but nevertheless mortality rates are high. More insight into the biology of liposarcoma tumorigenesis is needed to devise novel therapeutic approaches. MicroRNAs (miRNAs) have been associated with carcinogenesis in many tumors and may function as tumor suppressor or oncogene. In this study we examined miRNA expression in an initial series of 57 human liposarcomas (including all subtypes), lipomas and normal fat by miRNA microarrays. Supervised hierarchical clustering of the most differentially expressed miRNAs (p<0.0002) distinguished most liposarcoma subtypes and control tissues. The distinction between well differentiated liposarcomas and benign lipomas was blurred, suggesting these tumor types may represent a biological continuum. MiRNA signatures of liposarcoma subtypes were established and validated in an independent series of 58 liposarcomas and control tissues. The expression of the miR-143/145 and miR-144/451 cluster members was clearly reduced in liposarcomas compared to normal fat. Overexpression of miR-145 and miR-451 in liposarcoma cell lines decreased cellular proliferation rate, impaired cell cycle progression and induced apoptosis. In conclusion, we show that miRNA expression profiling can be used to discriminate liposarcoma subtypes, which could aid in objective diagnostic decision making. In addition, our data indicate that miR-145 and miR-451 act as tumor suppressors in adipose tissue and show that re-expression of these miRNAs could be a promising therapeutic strategy for liposarcomas. 57 samples discovery set, 58 samples in validation set, subdivided in 5 liposarcoma subtypes plus lipomas and normal fat as control samples. Each sample was analysed on one array. All array probes are present in duplicate.
2014-03-01 | E-GEOD-45363 | biostudies-arrayexpress