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MicroRNA-24 regulates cardiac fibrosis after myocardial infarction.

Wang J, Huang W, Xu R, Nie Y, Cao X, Meng J, Xu X, Hu S, Zheng Z - J. Cell. Mol. Med. (2012)

Bottom Line: TGF-β (a pathological mediator of fibrotic disease) increased miR-24 expression, overexpression of miR-24 reduced TGF-β secretion and Smad2/3 phosphorylation in CFs.Finally, we demonstrated that protein and mRNA levels of furin were regulated by miR-24 in CFs.Thus, miR-24 may be used as a target for treatment of MI and other fibrotic heart diseases.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Translational Cardiovascular Medicine, Fuwai Hospital & Cardiovascular Institute, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China.

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MiR-24 is down-regulated in different areas of the heart after MI. (A) miRNAs were isolated in different areas of the infracted heart and sham-opened hearts 1, 2, and 4 weeks after MI. qRT-PCR was done to determine levels of miR-24 in MI areas and in control groups. Compared with sham-operated hearts, miR-24 expression was significantly decreased in MI areas. (B–D) qRT-PCR was done to determine expression of collagen-1 (B), fibronectin (C), and TGF-β1 (D) in the same samples as (A) (I: infarct zone; BZ: border zone; R: remote zone; n = 3 for each time-point; mean ± S.E.M. *P < 0.05, **P < 0.01 compared with sham groups).
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fig01: MiR-24 is down-regulated in different areas of the heart after MI. (A) miRNAs were isolated in different areas of the infracted heart and sham-opened hearts 1, 2, and 4 weeks after MI. qRT-PCR was done to determine levels of miR-24 in MI areas and in control groups. Compared with sham-operated hearts, miR-24 expression was significantly decreased in MI areas. (B–D) qRT-PCR was done to determine expression of collagen-1 (B), fibronectin (C), and TGF-β1 (D) in the same samples as (A) (I: infarct zone; BZ: border zone; R: remote zone; n = 3 for each time-point; mean ± S.E.M. *P < 0.05, **P < 0.01 compared with sham groups).

Mentions: We previously monitored miRNA expression and cardiac fibrosis in remodelling and reverse remodelling of the heart, and found that changes in the expression of miR-24 were associated with fibrosis. To ascertain if miR-24 is dysregulated during MI, we measured expression of the miR-24 at various time-points and different sections in a mouse model of MI. Expression of the miR-24 transcript was down-regulated after MI; expression peaked 1 week after MI, then gradually attenuated in infarct and remote areas over time, and was finally restored to normal levels at 28 days after MI (Fig. 1A). In the same way, expression of collagen-1, fibronectin and TGF-β1 in different areas in the MI model was detected at different times (Fig. 1B–D), a significant correlation was found between expression of miR-24 and fibrosis level.


MicroRNA-24 regulates cardiac fibrosis after myocardial infarction.

Wang J, Huang W, Xu R, Nie Y, Cao X, Meng J, Xu X, Hu S, Zheng Z - J. Cell. Mol. Med. (2012)

MiR-24 is down-regulated in different areas of the heart after MI. (A) miRNAs were isolated in different areas of the infracted heart and sham-opened hearts 1, 2, and 4 weeks after MI. qRT-PCR was done to determine levels of miR-24 in MI areas and in control groups. Compared with sham-operated hearts, miR-24 expression was significantly decreased in MI areas. (B–D) qRT-PCR was done to determine expression of collagen-1 (B), fibronectin (C), and TGF-β1 (D) in the same samples as (A) (I: infarct zone; BZ: border zone; R: remote zone; n = 3 for each time-point; mean ± S.E.M. *P < 0.05, **P < 0.01 compared with sham groups).
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3822985&req=5

fig01: MiR-24 is down-regulated in different areas of the heart after MI. (A) miRNAs were isolated in different areas of the infracted heart and sham-opened hearts 1, 2, and 4 weeks after MI. qRT-PCR was done to determine levels of miR-24 in MI areas and in control groups. Compared with sham-operated hearts, miR-24 expression was significantly decreased in MI areas. (B–D) qRT-PCR was done to determine expression of collagen-1 (B), fibronectin (C), and TGF-β1 (D) in the same samples as (A) (I: infarct zone; BZ: border zone; R: remote zone; n = 3 for each time-point; mean ± S.E.M. *P < 0.05, **P < 0.01 compared with sham groups).
Mentions: We previously monitored miRNA expression and cardiac fibrosis in remodelling and reverse remodelling of the heart, and found that changes in the expression of miR-24 were associated with fibrosis. To ascertain if miR-24 is dysregulated during MI, we measured expression of the miR-24 at various time-points and different sections in a mouse model of MI. Expression of the miR-24 transcript was down-regulated after MI; expression peaked 1 week after MI, then gradually attenuated in infarct and remote areas over time, and was finally restored to normal levels at 28 days after MI (Fig. 1A). In the same way, expression of collagen-1, fibronectin and TGF-β1 in different areas in the MI model was detected at different times (Fig. 1B–D), a significant correlation was found between expression of miR-24 and fibrosis level.

Bottom Line: TGF-β (a pathological mediator of fibrotic disease) increased miR-24 expression, overexpression of miR-24 reduced TGF-β secretion and Smad2/3 phosphorylation in CFs.Finally, we demonstrated that protein and mRNA levels of furin were regulated by miR-24 in CFs.Thus, miR-24 may be used as a target for treatment of MI and other fibrotic heart diseases.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Translational Cardiovascular Medicine, Fuwai Hospital & Cardiovascular Institute, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China.

Show MeSH
Related in: MedlinePlus