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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...
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A Microarray, Validation, and Gene-Enrichment Approach for Assessing Differentially Expressed Circulating miRNAs in

Douglas Dos Santos Soares1,2, Amanda Lopes1,2, Mariana Recamonde-Mendoza3,4

  • 1Experimental and Molecular Cardiovascular Laboratory, Heart Failure and Cardiac Transplant Unit, Cardiology Division, Hospital de Clínicas de Porto Alegre, Porto Alegre 90035-903, Brazil.

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This study identifies specific microRNAs (miRNAs) linked to heart failure (HF) and obesity. These circulating miRNAs may offer insights into the obesity paradox in heart failure patients.

Keywords:
bioinformaticcirculating microRNAheart failuremicroRNAmicroarrayobesity

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Area of Science:

  • Cardiovascular Disease Research
  • Molecular Biology
  • Genetics

Background:

  • Obesity is a known risk factor for cardiovascular diseases, including heart failure (HF).
  • The 'obesity paradox' describes longer survival in overweight/obese HF patients compared to underweight individuals.
  • MicroRNAs (miRNAs) are crucial regulators in gene expression, implicated in both obesity and HF pathogenesis.

Purpose of the Study:

  • To identify and validate differentially expressed circulating miRNAs in patients with heart failure, comparing obese (HF-obese) and lean (HF-lean) groups.
  • To investigate whether observed miRNA expression patterns are independent of obesity status in heart failure.
  • To explore the regulatory roles of identified miRNAs in biological processes relevant to metabolic, morphological, and functional outcomes.

Main Methods:

  • A two-phase case-control study involving plasma samples from heart failure patients and healthy controls.
  • Discovery phase: miRNA 4.0 Affymetrix GeneChip array analysis on 30 samples (20 HF patients, 10 controls).
  • Validation phase: Quantitative PCR (qPCR) analysis of selected miRNAs (-451a, -22-3p, -548ac) in 80 samples (HF-lean, HF-obese, controls). Target and functional enrichment analyses were also performed.

Main Results:

  • MiRNAs -451a and -22-3p were consistently up-regulated in both HF-obese and HF-lean groups compared to controls across discovery and validation phases.
  • MiRNA -548ac showed down-regulation in the discovery phase but up-regulation in the validation phase when comparing HF groups to controls.
  • The expression patterns of these miRNAs suggest their involvement in heart failure is independent of obesity status.

Conclusions:

  • Specific circulating miRNAs (-451a, -22-3p, -548ac) are differentially expressed in heart failure patients.
  • These miRNA expression changes appear to be independent of obesity, suggesting a direct role in heart failure pathophysiology.
  • The identified miRNAs regulate genes and biological pathways critical for metabolic, morphological, and functional aspects of cardiovascular health.