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MicroRNAs

MicroRNAs

MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...

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Disruption of the Mouse Blood-Brain Barrier by Small Extracellular Vesicles from Hypoxic Human Placentas

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MicroRNA expression profiles in placenta with severe preeclampsia using a PNA-based microarray.

S-Y Choi¹, J Yun, O-J Lee

¹Department of Pathology, Chungbuk National University Hospital, Cheongju, South Korea.

|July 9, 2013

Summary

This summary is machine-generated.

Preeclampsia (PE) is linked to altered placental miRNA profiles. Dysregulated miRNAs, including miR-26b and miR-223, are associated with PE pathogenesis, suggesting potential diagnostic markers.

Keywords:

MicroRNAs Placenta Preeclampsia

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Area of Science:

Reproductive Biology
Molecular Genetics
Biochemistry

Background:

Preeclampsia (PE) is a major global cause of maternal and neonatal mortality.
The precise pathophysiology of PE remains incompletely understood.
MicroRNAs (miRNAs) are implicated in gene regulation and potentially in PE pathogenesis via placental dysregulation.

Purpose of the Study:

To investigate miRNA expression profiles in placental tissue from patients with severe preeclampsia.
To identify specific miRNAs associated with the pathogenesis of preeclampsia.
To understand the role of miRNA dysregulation in the early development of PE.

Main Methods:

MiRNA profiling was conducted on 20 placental samples (10 severe PE, 10 control).
Formalin-fixed, paraffin-embedded tissues were analyzed using a hybridization-based microarray with a PNA-probe targeting 158 miRNAs.
Computational algorithms predicted target genes and associated signaling pathways.

Main Results:

Thirteen miRNAs were significantly overexpressed (e.g., miR-92b, miR-26b) and two were underexpressed (miR-21, miR-223) in PE placentas compared to controls.
Expression levels of miR-26b, miR-296-5p, and miR-223 aligned with previous research findings.
Predicted target genes were involved in pathways such as adherens junction and focal adhesion.

Conclusions:

Dysregulated miRNAs are present in the placentas of PE patients.
These miRNA alterations are closely associated with the early stages of PE pathogenesis.
Further research is warranted for developing diagnostic and management tools for PE.