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Published on: August 24, 2019
MicroRNA-29 in aortic dilation: implications for aneurysm formation.
Reinier A Boon1, Timon Seeger, Susanne Heydt
1Institute for Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University, Theodor Stern-Kai 7, 60590 Frankfurt, Germany.
Circulation Research
|September 10, 2011
Summary
Aging increases aortic aneurysm risk. MicroRNAs (miRs), specifically miR-29, drive this by reducing extracellular matrix (ECM) proteins. Inhibiting miR-29 may prevent aortic dilation and strengthen vascular walls.
Area of Science:
- Vascular Biology
- Aging Research
- Molecular Medicine
Background:
- Aging is a primary risk factor for cardiovascular diseases, including aortic aneurysms.
- MicroRNAs (miRs) are critical regulators of cellular processes, but their function in age-related vascular disease remains unclear.
Purpose of the Study:
- To identify vascular miRs influenced by aging.
- To investigate the role of these miRs in age-induced vascular pathologies, particularly aortic aneurysm formation.
Main Methods:
- Aortic tissue expression profiling in young versus aged mice.
- Analysis of miR-29 family expression in experimental mouse models of aortic dilation.
- Assessment of miR-29b levels in human thoracic aneurysm biopsies.
- In vivo silencing of miR-29 using antisense oligonucleotides.
Main Results:
- Age-associated miRs were identified, with miR-29 family members significantly upregulated in aged mouse aortas.
- Increased miR-29 correlated with reduced extracellular matrix (ECM) components, suggesting a role in ECM loss and aneurysm susceptibility.
- miR-29 expression was elevated in mouse models of aortic dilation and in human thoracic aneurysms.
- miR-29 inhibition restored ECM expression and prevented aortic dilation in mice.
Conclusions:
- The miR-29 family downregulates ECM proteins, potentially predisposing the aorta to aneurysm formation in aging individuals.
- Inhibition of miR-29 in vivo reverses aortic dilation, highlighting its potential as a therapeutic target for maintaining vascular integrity.
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