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Cushing's disease adenomas

ABSTRACT: Cushing's disease adenomas

PROVIDER: PRJNA858407 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR20140500.fastq.gz	Fastqsanger.gz
	SRR20140501.fastq.gz	Fastqsanger.gz
	SRR20140502.fastq.gz	Fastqsanger.gz
	SRR20140503.fastq.gz	Fastqsanger.gz
	SRR20140468.fastq.gz	Fastqsanger.gz

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RNA-seq comparing Cushing's disease adenomas and surrounding normal tissues

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Small RNA-seq analysis of circulating miRNAs in Cushing's syndrome

Project description:Patients with Cushing’s syndrome (Cushing's syndrome) in remission show sustained fatigue, myopathy, and an increased prevalence of sarcopenia. The mechanisms that determine these persistent muscle problems are not well known. We aimed to identify circulating microRNAs (miRNAs) with differential expression that could be potential biomarkers for the diagnosis and/or prognosis in Cushing's syndrome. In this data set, we analized thirty-six women in sustained remission for 13 ± 7 years (mean ± SD) from Cushing's syndrome, with a median age (IQ range) of 51 (45.2–60) years and mean ± SD BMI of 27 ± 4 Kg/m2, and 36 matched healthy controls using small RNA-sequencing of small RNA purified from plasma samples of these patients and control. In 7 patients sarcopenia was present according to the European Working Group on Sarcopenia in Older People (EWGSOP) criteria. Validation was carried out using RT-qPCR. For the validation, Taqman probes were performed on QuantStudio 5 equipment (Applied Biosystems). In a first discovery group using RNA-sequencing, plasma samples of 18 Cushing's syndrome patients and 18 healthy subjects were investigated; circulating miR-28-5p, miR-495-3p and miR-654-5p were upregulated in Cushing's syndrome patients as compared with controls (p<0.05). In a validation study of the 3 upregulated miRNAs in 36 patients and 26 controls, no differences were observed by RT-qPCR; however, the expression of circulating miR-28-5p was upregulated in Cushing's syndrome patients with sarcopenia as compared with those without (AUC for fold-change in the ROC analysis, 0.798; p=0.0156). The optimized cut-off value for miR-28-5p to identify Cushing's syndrome patients with sarcopenia was 3.80, which yielded a sensitivity of 86% and a specificity of 69%.

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Project description:Glucocorticoids have major effects on adipose tissue metabolism. To study tissue mRNA expression changes induced by chronic elevated endogenous glucocorticoids, we performed RNA sequencing on subcutaneous adipose tissue from patients with Cushing’s disease (n=5) compared to patients with non-functioning pituitary adenomas (n=11). We found higher expression of transcripts involved in several metabolic pathways, including lipogenesis, proteolysis and glucose oxidation as well as decreased expression of transcripts involved in inflammation and protein synthesis. To further study this in a model system, we subjected mice to dexamethasone treatment for 12 weeks and analyzed their inguinal (subcutaneous) fat pads, which led to similar findings. Additionally, mice treated with dexamethasone showed drastic decreases in lean body mass as well as increased fat mass, further supporting the human transcriptomic data. These data provide insight to transcriptional changes that may be responsible for the co-morbidities associated with chronic elevations of glucocorticoids DESIGN: Patients with cushing's (n=5) or non-functioning pituitary adenoma (n=11) were prospectively observed from March 2011 to June 2012.

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Project description:Recurrent single-nucleotide and small indel somatic mutations were infrequent among the three adenoma subtypes. However, somatic copy-number alterations (SCNA) were identified in all three pituitary adenoma subtypes. Methylation analysis revealed adenoma subtype-specific DNA methylation profiles, with GHsecreting adenomas being dominated by hypomethylated sites. Likewise, gene-expression patterns revealed adenoma subtype-specific profiles. Integrating DNA methylation and gene-expression data revealed that hypomethylation of promoter regions are related with increased expression of GH1 and SSTR5 genes in GH-secreting adenomas and POMC gene in ACTH secreting adenomas. Finally, multispectral IHC staining of immune-related proteins showed abundant expression of PD-L1 among all three adenoma subtypes.

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