The Long Noncoding RNA Metastasis-Associated Lung Adenocarcinoma Transcript-1 Regulates CCDC80 Expression by...

Area of Science:

• Molecular Biology
• Cardiovascular Research
• Noncoding RNA Biology

Background:

• Coiled-Coil Domain Containing 80 (CCDC80) accelerates atherosclerosis by reducing lipoprotein lipase (LPL) expression.
• The regulatory mechanisms of CCDC80 expression remain largely unknown.
• Investigating noncoding RNA involvement in CCDC80 regulation is crucial for understanding atherosclerosis.

Purpose of the Study:

• To elucidate the role of noncoding RNAs in regulating CCDC80 expression in vascular smooth muscle cells.
• To identify specific noncoding RNAs that interact with CCDC80.
• To determine the functional consequences of these interactions on CCDC80 and LPL expression.

Main Methods:

• Bioinformatics analysis and luciferase reporter assays to predict and confirm miRNA-target interactions.
• Transfection with miRNA mimics and inhibitors to modulate miR-141-3p/200a-3p activity.
• Overexpression and knockdown of long noncoding RNA MALAT1.
• Quantitative reverse transcription PCR (RT-qPCR) and Western blotting to assess gene and protein expression levels.

Main Results:

• miR-141-3p/200a-3p directly bind to the 3' untranslated region (3'UTR) of CCDC80, decreasing its expression and increasing LPL expression.
• lncRNA MALAT1 interacts with miR-141-3p/200a-3p, reducing their expression.
• MALAT1 overexpression increases CCDC80 and decreases LPL expression, an effect reversed by miR-141-3p/200a-3p mimics, and vice versa for MALAT1 knockdown.

Conclusions:

• lncRNA MALAT1 acts as a molecular regulator of CCDC80 and LPL expression.
• The regulatory pathway involves MALAT1 sponging miR-141-3p/200a-3p, thereby influencing CCDC80 and LPL levels.
• This crosstalk provides a novel molecular mechanism contributing to atherosclerosis progression.