Résumé
Background: Cortisol has been implicated in hypertension and lately reported to be regulated at the pre-receptor level by the 11ßHSD1 enzyme, which converts cortisone (E) to cortisol (F). Over expression ofthis enzyme in adipose tissue could determine an increase in available cortisol that interacts with the mineralocorticoid receptor (MR) in renal, brain and heart tissue, leading to similar hypertensive effects as in 11ßHSD2 impaired patients. Severa! polymorphisms have been reported in HSDl IB 1 gene (CAI5, CAI9 and InsA83557), which could modify HSDl IB 1 gene expression or activity. Aun: To determine the distribution and prevalence of CAI5, CAI9 and InsA83557 in the HSDl IBl gene, and to correlate these results with biochemical parameters in cortisol/ ACTH (HPA) and renin-angiotensin-aldosterone (RAA) axis in patients with essential hypertension (EH). Patients and Methods: We studied 113 EHpatients (76 non-obese and 37 obese, with a body mass índex >30 kg/m²) and 30 normotensive adults (NT). In each patient, we measured serum levéis of E E, serum aldosterone (SA), plasma renin activity (PRA), adrenocorticotrophic hormone (ACTH), the urinary free cortisol/creatinine (UFF/Cr), F/ACTH and SA/PRA ratios. Each polymorphism was studied by PCR and 8 percent polyacrylamide gel electrophoresis. Statistical associations were evaluated by Pearson correlations and the genetic equilibñum by the Hardy-Weinberg (H-W) equation. Results: We found all three polymorphisms in the EH and the NT group, both in genetic equilibñum. In obese essential hypertensives, the CAI5polymorphism showed association with SA/PRA ratio (r =0.189, p =0.012) and F/ACTH (r =0.301, p 0.048); CA19 also showed correlation with F/ACTH in obese EH (r = 0.220, p 0.009). The InsA83557polymorphism correlated with UFF/Cr in both EH (r =0.206; p =0.03), and in obese EH (r =0.354; p =0.05). Conclusions: The CAI5 and CAI9 polymorphism correlated with changes in biochemical parameters...