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Published on: May 11, 2015
Lung microRNA profile in chronic cyanotic piglets with decreased pulmonary blood flow
Dong Wang1, Ying-Long Liu, Xiao-Dong Lü
1Department of Pediatric Cardiac Center, Beijing Anzhen Hospital, Capital Medical University, Beijng 100029, China.
Insights
This study investigated microRNAs in immature piglets with cyanotic congenital heart defects. Researchers found miR-370 and miR-320 were significantly up-regulated in cyanotic lung tissues, offering insights into disease mechanisms.
Area of Science:
- Cardiovascular Research
- Molecular Biology
- Pediatric Cardiology
Background:
- Cyanotic congenital heart defects (CCHDs) significantly contribute to infant morbidity and mortality.
- The genetic basis and microRNA mechanisms underlying CCHDs remain largely unknown.
- Lung ischemia and hypoxia are key factors in CCHDs.
Purpose of the Study:
- To investigate microRNA regulation in the lungs of immature piglets with CCHDs.
- To identify specific microRNAs involved in the pathogenesis of cyanotic heart defects.
- To elucidate the molecular mechanisms of CCHDs in a preclinical model.
Main Methods:
- A cyanotic piglet model was created using surgical shunts and pulmonary artery banding.
- Pulmonary lobe RNA was extracted 4 weeks post-surgery for microRNA analysis.
- Solexa deep sequencing and microarray hybridization were used to profile lung microRNAs, with validation by quantitative RT-PCR.
Main Results:
- The cyanotic piglet model exhibited characteristic physiological changes, including lower oxygen tension and saturation.
- Among 1273 identified lung microRNAs, miR-370 and miR-320 showed significant differential expression.
- These two microRNAs were notably up-regulated in the cyanotic lung tissues compared to controls.
Conclusions:
- The study successfully profiled lung microRNAs in immature piglets with induced cyanotic defects.
- miR-370 and miR-320 are identified as significantly up-regulated in cyanotic lung tissues.
- These findings contribute to understanding the molecular underpinnings of CCHDs and suggest potential therapeutic targets.
Background:
Cyanotic congenital heart defects with decreased pulmonary blood flow due to lung ischemia, hypoxia, and others lead to infant morbidity and mortality more than acyanotic heart disease does. Despite the great effort of medical research, their genetic link and underlying microRNAs molecular mechanisms remain obscure. In this study, we aimed to investigate microRNAs regulation during cyanotic defects in lung of immature piglets.
Methods:
Cyanotic piglet model was induced by main pulmonary artery-left atrium shunt with distal pulmonary artery banding. Four weeks later, hemodynamic parameters confirmed the development of cyanotic defects and pulmonary lobe RNA was extracted from all animals. We studied the repertoire of porcine lung microRNAs by Solexa deep sequencing technology and quantified highly expressed microRNAs by microarray hybridization. Furthermore, we quantitated selected microRNAs from cyanotic and control piglets by quantitative RT-PCR.
Results:
After surgical procedure 4 weeks later, the cyanotic model produced lower arterial oxygen tension, arterial oxygen saturation, and higher arterial carbon dioxide tension, hematocrit and hemoglobin concentration than controls (all P < 0.05). In 1273 miRNAs expressed in the immature piglets lungs, 2 most abundant microRNAs (miR-370 and miR-320) demonstrated significant difference between cyanotic and control group (all P < 0.05).
Conclusion:
Our results extended lung microRNA profile in immature piglets and suggested that miR-370 and miR-320 are significantly up-regulated in cyanotic lung tissues.
