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Arterial dysfunction but maintained systemic blood pressure in cavin-1-deficient mice
Karl Swärd1, Sebastian Albinsson1, Catarina Rippe1
1Department of Experimental Medical Science, Lund University, Lund, Sweden.
Plos One
|March 25, 2014
Summary
Absence of cavin-1 protein in mice leads to loss of caveolae in small arteries. This results in altered vascular function, but systemic blood pressure remains stable due to opposing effects.
Area of Science:
- Vascular Biology
- Cellular Biology
- Biochemistry
Background:
- Caveolae are vital plasma membrane micro-domains, crucial for vascular cell function.
- Caveolae formation requires caveolin-1 and cavin-1; their absence causes caveolae loss.
- Caveolin-1 deficiency impairs blood vessels, but cavin-1's vascular role is unclear.
Purpose of the Study:
- To investigate the vascular effects of cavin-1 deficiency.
- To determine if cavin-1 absence leads to vascular dysfunction similar to caveolin-1 deficiency.
Main Methods:
- Utilized small mesenteric arteries from cavin-1-deficient mice.
- Examined gene and protein expression of caveolins and cavins.
- Assessed caveolae presence using electron microscopy.
- Measured vascular contractility, dimensions, and nitric oxide production.
Main Results:
- Cavin-1 deficiency led to loss of caveolae in endothelial and smooth muscle cells.
- Arginase and α1-adrenergic contraction increased, alongside media thickness and reduced distensibility.
- Myogenic tone decreased, partly due to elevated nitric oxide production.
- In vivo blood pressure remained unchanged despite opposing vascular effects.
Conclusions:
- Cavin-1 deficiency significantly impacts small artery function.
- Opposing vascular changes (increased contractility, reduced myogenic tone) maintain stable blood pressure.
- Cavin-1 plays a critical role in regulating vascular homeostasis.
