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Collagen type-I degradation is related to arterial stiffness in hypertensive and normotensive subjects

Journal of Human Hypertension volume 20, pages 867–873 (2006)Cite this article

Abstract

Although arterial stiffness is an independent cardiovascular risk factor associated with both aging and hypertension, relatively little is known regarding the structural changes in the vessel wall that occur with vessel stiffening. We determined if collagen type-I metabolism is related to arterial stiffening in both hypertensive and normotensive subjects. Arterial stiffness was assessed by aortic pulse wave velocity (PWV) and augmentation index (AIx) in 46 subjects (48.7±2 years, 32 hypertensives) and related to circulating markers of collagen type-I turnover. Collagen synthesis was assessed by the measurement of carboxy-terminal peptide of procollagen type-I (PIP) and collagen degradation by the measurement of carboxy-terminal telopeptide of collagen type-I (ICTP), by quantitative immunoassay. Matrix metalloproteinase-1 (MMP-1) and the tissue inhibitor of metalloproteinase-1 (TIMP-1) were also quantified by immunoassay. The ratio of collagen type-I synthesis to degradation was negatively correlated with both PWV (P<0.05) and AIx (P<0.05), whereas plasma MMP-1 levels displayed a positive correlation with both PWV (P<0.01) and AIx (P<0.01), after adjustment for age and mean arterial pressure. The relationship between collagen type-I turnover and arterial stiffness was similar in both the normotensive and hypertensive subjects. Although circulating markers of collagen synthesis were increased in the hypertensive subjects, this was not related to arterial stiffness. Collagen type-I degradation is increased in relation to collagen type-I synthesis in subjects with stiffer arteries. Matrix metalloproteinase-1, the enzyme responsible for collagen type-I degradation, is positively related to both large elastic and muscular artery stiffness in normotensive and hypertensive subjects.

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Acknowledgements

We thank the Royal City of Dublin Hospital Trust (Baggot Street Fund) for the sponsorship of this work.

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Authors and Affiliations

  1. Department of Pharmacology and Therapeutics, St James's Hospital, Dublin, Ireland

    M McNulty, A Mahmud & J Feely

  2. Trinity College Dublin and Hypertension Clinic, St James's Hospital, Dublin, Ireland

    A Mahmud, P Spiers & J Feely

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  1. M McNulty
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Correspondence to A Mahmud.

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McNulty, M., Mahmud, A., Spiers, P. et al. Collagen type-I degradation is related to arterial stiffness in hypertensive and normotensive subjects. J Hum Hypertens 20, 867–873 (2006). https://doi.org/10.1038/sj.jhh.1002015

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