RGD Reference Report - Tissue inhibitor of metalloproteinase-1 and matrix metalloproteinase-9 levels in patients with hypertension Relationship to tissue Doppler indices of diastolic relaxation. - Rat Genome Database

RGD Reference Report - Tissue inhibitor of metalloproteinase-1 and matrix metalloproteinase-9 levels in patients with hypertension Relationship to tissue Doppler indices of diastolic relaxation. - Rat Genome Database

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Tissue inhibitor of metalloproteinase-1 and matrix metalloproteinase-9 levels in patients with hypertension Relationship to tissue Doppler indices of diastolic relaxation.
Authors:	Tayebjee, MH Nadar, SK MacFadyen, RJ Lip, GY
Citation:	Tayebjee MH, etal., Am J Hypertens. 2004 Sep;17(9):770-4.
RGD ID:	1580163
Pubmed:	PMID:15363818 (View Abstract at PubMed)
DOI:	DOI:10.1016/j.amjhyper.2004.06.023 (Journal Full-text)
BACKGROUND: Hypertension, hypertensive heart disease, and left ventricular (LV) hypertrophy are integral to symptomatic diastolic heart failure. Tissue inhibitor of metalloproteinase-1 (TIMP-1) is linked to extracellular matrix fibrosis and is elevated in hypertension. We hypothesized a link between circulating TIMP-1, matrix metalloproteinase-9 (MMP-9), and resting echocardiographic LV filling parameters using tissue Doppler parameters of diastolic (dys)function. METHODS: Circulating MMP-9 and TIMP-1 levels were measured in citrated plasma by ELISA in 74 patients with hypertension (58 men, mean age 58 +/- 11 years) and 34 controls (23 men, mean age 53 +/- 13 years). All had confirmed normal short axis systolic contractility, with no significant wall motion abnormalities; the LV mass and standard resting tissue Doppler echocardiographic indices of diastolic function were also recorded. RESULTS: Both MMP-9 and TIMP-1 levels were higher in the hypertensive group (P =.0039 and P =.0054, respectively). When compared to controls, hypertensive patients had a greater LV mass (P =.0054), and differences in many of the parameters reflecting diastolic dysfunction (controls versus hypertensives: E: 0.71 +/- 0.15 v 0.81 +/- 0.15 m/sec, P =.004; A: 0.66 +/- 0.12 v 0.81 +/- 0.16 m/sec, P <.0001; e': 0.12 (0.09-0.14) v 0.09 (0.07-0.10) m/sec, P =.0017; e'/a': 1.20 (1.00-1.80) v 0.88 (0.71-1.05), P <.0001; E/e': 6.54 (4.75-7.14) v 8.89 (7.55-10.75), P <.0001, respectively). Within the hypertensive cohort, only TIMP-1 levels correlated with LV mass (r = 0.271, P =.024), LV mass index (r = 0.323, P =.007), and tissue Doppler parameters of diastolic dysfunction, including e' (r = -0.338, P =.005), a' (r = -0.350, P =.005), and E/e' (r = 0.334, P =.005). CONCLUSIONS: TIMP-1 is thought to increase tissue concentrations of collagen type I by preventing its breakdown by MMPs. Our findings therefore add weight to a hypothesis suggesting that TIMP-1 may be a key mediator of LV diastolic dysfunction through definition of ventricular matrix composition.

Objects referenced in this article

Gene	TIMP1	TIMP metallopeptidase inhibitor 1	Homo sapiens
Gene	Timp1	tissue inhibitor of metalloproteinase 1	Mus musculus
Gene	Timp1	TIMP metallopeptidase inhibitor 1	Rattus norvegicus

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