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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Gender differences in the relationships between plasma plasminogen activator inhibitor-1 activity and factors linked to the insulin resistance syndrome in essential hypertension.
Impaired fibrinolysis due to elevated levels of plasma plasminogen activator inhibitor type 1 (PAI-1) is a risk factor for thromboembolic disease. Hypertension, obesity, derangements in lipid and glucose homeostasis, and elevated levels of PAI-1 are features of the insulin resistance syndrome. The interrelationships between PAI-1 and the metabolic disturbances seen in this condition are unsettled. We investigated the associations between PAI-1 activity and components of the insulin resistance syndrome in 53 men and 31 women with untreated hypertension. In men, PAI-1 activity correlated significantly with plasma glucose (r = .41, P = .002), insulin sensitivity (r = -.35, P = .01), and insulin-induced suppression of nonesterified fatty acid (NEFA) (r = -.43, P = .007). Plasma glucose and NEFA suppression were independently associated with PAI-1 activity in a multivariate analysis. In women, PAI-1 activity correlated with body mass index (r = .62, P = .0005), waist-to-hip ratio (r = .75, P = .0001), plasma glucose (r = .50, P = .007), insulin (r = .49, P = .009), proinsulin (r = .57, P = .002), C-peptide (r = .60, P = .0009), insulin sensitivity (r = -.74, P = .0001), NEFA suppression (r = -.64, P = .003), and triglycerides (r = .58, P = .001). In multivariate analyses, insulin sensitivity and NEFA suppression were independently associated with PAI-1 if waist-to-hip ratio was not included in the model. After introduction of waist-to-hip ratio into the model, waist-to-hip ratio was the only independent predictor of PAI-1 activity. We conclude that in women, waist-to-hip ratio, body mass index, and insulin-induced NEFA suppression are determinants for PAI-1 activity. In men, insulin-induced NEFA suppression and plasma glucose are independently associated with PAI-1 activity.
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