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Homocysteine increases cyclin-dependent kinase in aortic rat tissue
B Lubec1, O Labudova, H Hoeger
1University of Vienna, Department of Pediatrics, Austria.
Circulation
|November 15, 1996
Summary
High homocysteine levels increase aortic cyclin-dependent kinase, a key cell proliferation factor. This suggests homocysteine may drive arterial disease by promoting smooth muscle cell growth.
Area of Science:
- Cardiovascular Biology
- Molecular Biology
- Cell Biology
Background:
- Hyperhomocysteinemia is a known risk factor for occlusive arterial disease.
- Homocysteine's direct effect on smooth muscle cell proliferation has been proposed.
- Cyclin-dependent kinase (CDK) is a critical regulator of cell mitosis and proliferation.
Purpose of the Study:
- To investigate the effect of homocysteine on aortic cyclin-dependent kinase (CDK).
- To determine if homocysteine influences CDK at the transcriptional and protein levels.
- To assess the impact of homocysteine on aortic cell proliferation.
Main Methods:
- Rats were administered varying doses of homocysteine, homocysteic acid, cysteine, or ascorbic acid for 12 weeks.
- Aortic cyclin-dependent kinase (CDK) mRNA and protein levels were quantified.
- Endothelial damage markers (ACE, von Willebrand factor) and cell proliferation (bromodeoxyuridine incorporation) were assessed.
Main Results:
- Homocysteine significantly elevated aortic CDK protein and mRNA levels in a dose-dependent manner.
- Higher homocysteine doses led to endothelial damage, indicated by altered ACE and von Willebrand factor.
- Bromodeoxyuridine incorporation confirmed aortic wall cell proliferation in rats receiving high-dose homocysteine.
Conclusions:
- Homocysteine specifically stimulates aortic cyclin-dependent kinase (CDK) transcription.
- Elevated CDK by homocysteine may lead to aortic cell proliferation.
- These findings link homocysteine to arterial disease pathogenesis through CDK activation and cell growth.