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MicroRNA expression patterns associated with hyperfunctioning and non-hyperfunctioning phenotypes in adrenocortical
David Velázquez-Fernández1, Stefano Caramuta, Deniz M Özata
1Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden.
Background:
The adrenocortical adenoma (ACA) entity includes aldosterone-producing adenoma (APA), cortisol-producing adenoma (CPA), and non-hyperfunctioning adenoma (NHFA) phenotypes. While gene mutations and mRNA expression profiles have been partly characterized, less is known about the alterations involving microRNA (miRNA) expression.
Aim:
To characterize miRNA expression profile in relation to the subtypes of ACAs.
Subjects And Methods:
miRNA expression profiles were determined in 26 ACAs (nine APAs, ten CPAs, and seven NHFAs) and four adrenal references using microarray-based screening. Significance analysis of microarrays (SAM) was carried out to identify differentially expressed miRNAs between ACA and adrenal cortices or between tumor subtypes. Selected differentially expressed miRNAs were validated in an extended series of 43 ACAs and ten adrenal references by quantitative RT-PCR.
Results:
An hierarchical clustering revealed separate clusters for APAs and CPAs, while the NHFAs were found spread out within the APA/CPA clusters. When NHFA was excluded, the clustering analysis showed a better separation between APA and CPA. SAM analysis identified 40 over-expressed and three under-expressed miRNAs in the adenomas as compared with adrenal references. Fourteen miRNAs were common among the three ACA subtypes. Furthermore, we found specific miRNAs associated with different tumor phenotypes.
Conclusion:
The results suggest that miRNA expression profiles can distinguish different subtypes of ACA, which may contribute to a deeper understanding of ACA development and potential therapeutics.
Insights
MicroRNA (miRNA) expression profiles can differentiate subtypes of adrenocortical adenoma (ACA), including aldosterone-producing adenoma (APA) and cortisol-producing adenoma (CPA). This finding advances understanding of ACA development and potential therapeutic strategies.
Area of Science:
- Endocrinology
- Molecular Biology
- Oncology
Background:
- Adrenocortical adenomas (ACAs) encompass aldosterone-producing adenoma (APA), cortisol-producing adenoma (CPA), and non-hyperfunctioning adenoma (NHFA).
- While genetic and mRNA profiles are partly understood, microRNA (miRNA) expression alterations in ACAs remain largely uncharacterized.
Purpose of the Study:
- To investigate and characterize miRNA expression profiles in relation to ACA subtypes.
- To identify specific miRNA signatures associated with different ACA phenotypes.
Main Methods:
- Microarray analysis of miRNA expression in 26 ACAs (9 APA, 10 CPA, 7 NHFA) and 4 adrenal references.
- Significance Analysis of Microarrays (SAM) to identify differentially expressed miRNAs.
- Validation of selected miRNAs using quantitative RT-PCR in an extended cohort (43 ACAs, 10 references).
Main Results:
- Hierarchical clustering revealed distinct clusters for APA and CPA, with NHFA intermixed.
- Excluding NHFA improved clustering separation between APA and CPA.
- SAM identified 40 over-expressed and 3 under-expressed miRNAs in ACAs compared to controls; 14 miRNAs were common across ACA subtypes.
Conclusions:
- miRNA expression profiles demonstrate potential for distinguishing ACA subtypes.
- These findings contribute to a deeper understanding of ACA pathogenesis.
- Characterizing miRNA profiles may inform the development of novel therapeutic approaches for ACAs.
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