title: Markers of collagen synthesis is related to blood pressure and vascular hypertrophy: a LIFE substudy.
abstract: Cardiac fibrosis and high levels of circulating collagen markers has been associated with left ventricular (LV) hypertrophy. However, the relationship to vascular hypertrophy and blood pressure (BP) load is unclear. In 204 patients with essential hypertension and electrocardiographic LV hypertrophy, we measured sitting BP, serum collagen type I carboxy-terminal telopeptide (ICTP) reflecting degradation, procollagen type I carboxy-terminal propeptide (PICP) reflecting synthesis and LV mass by echocardiography after 2 weeks of placebo treatment and after 1 year of antihypertensive treatment with a losartan- or an atenolol-based regimen. Furthermore, we measured intima-media thickness of the common carotid arteries (IMT), minimal forearm vascular resistance (MFVR) by plethysmography and ambulatory 24-h BP in around half of the patients. At baseline, PICP/ICTP was positively related to IMT (r=0.24, P<0.05), MFVR(men) (r=0.35, P<0.01), 24-h systolic BP (r=0.24, P<0.05) and 24-h diastolic BP (r=0.22, P<0.05), but not to LV mass. After 1 year of treatment with reduction in systolic BP (175+/-15 vs 151+/-17 mmHg, P<0.001) and diastolic BP (99+/-8 vs 88+/-9 mmHg, P<0.001), ICTP was unchanged (3.7+/-1.4 vs 3.8+/-1.4 microg/l, NS) while PICP (121+/-39 vs 102+/-29 microg/l, P<0.001) decreased. The reduction in PICP/ICTP was related to the reduction in sitting diastolic BP (r=0.31, P<0.01) and regression of IMT (r=0.37, P<0.05) in patients receiving atenolol and to reduction in heart rate in patients receiving losartan (r=0.30, P<0.01). In conclusion, collagen markers reflecting net synthesis of type I collagen were positively related to vascular hypertrophy and BP load, suggesting that collagen synthesis in the vascular wall is increased in relation to high haemodynamic load in a reversible manner.
authors.affiliation: Department of Clinical Physiology and Nuclear Medicine, Glostrup Hospital, University of Copenhagen, Denmark. mho@dadlnet.dk
authors.forename: M H
authors.initials: MH
authors.lastname: Olsen
authors.forename: M K
authors.initials: MK
authors.lastname: Christensen
authors.forename: K
authors.initials: K
authors.lastname: Wachtell
authors.forename: C
authors.initials: C
authors.lastname: Tuxen
authors.forename: E
authors.initials: E
authors.lastname: Fossum
authors.forename: L E
authors.initials: LE
authors.lastname: Bang
authors.forename: N
authors.initials: N
authors.lastname: Wiinberg
authors.forename: R B
authors.initials: RB
authors.lastname: Devereux
authors.forename: S E
authors.initials: SE
authors.lastname: Kjeldsen
authors.forename: P
authors.initials: P
authors.lastname: Hildebrandt
authors.forename: H
authors.initials: H
authors.lastname: Dige-Petersen
authors.forename: J
authors.initials: J
authors.lastname: Rokkedal
authors.forename: H
authors.initials: H
authors.lastname: Ibsen
mesh_terms: D000368:Aged; D000959:Antihypertensive Agents / Q000627:therapeutic use; D015415:Biomarkers / Q000097:blood; D001794:Blood Pressure / Q000187:drug effects / Q000502:physiology*; D018660:Blood Pressure Monitoring, Ambulatory; D017536:Carotid Artery, Common / Q000000981:diagnostic imaging / Q000473:pathology* / Q000503:physiopathology; D003094:Collagen / Q000096:biosynthesis*; D024042:Collagen Type I; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006973:Hypertension / Q000097:blood* / Q000188:drug therapy / Q000503:physiopathology; D006984:Hypertrophy / Q000097:blood / Q000000981:diagnostic imaging / Q000503:physiopathology; D017379:Hypertrophy, Left Ventricular / Q000097:blood / Q000000981:diagnostic imaging / Q000503:physiopathology; D008297:Male; D010446:Peptide Fragments / Q000097:blood*; D010455:Peptides; D010991:Plethysmography; D011347:Procollagen / Q000097:blood*; D011863:Radioimmunoassay; D014463:Ultrasonography; D014655:Vascular Resistance / Q000187:drug effects / Q000502:physiology
chemical_list: D000959:Antihypertensive Agents; D015415:Biomarkers; D024042:Collagen Type I; D010446:Peptide Fragments; D010455:Peptides; D011347:Procollagen; C052929:collagen type I trimeric cross-linked peptide; C042813:procollagen type I carboxy terminal peptide; D003094:Collagen