title: Bisoprolol and hydrochlorothiazide effects on cardiovascular remodeling in spontaneously hypertensive rats.
abstract: Anti-hypertensive agents may differently stimulate compensatory neuro-hormonal mechanisms and induce different effects on the cardiovascular remodeling and function. The combination of low doses of the two synergistic drugs may lead to a lesser activation of counter regulatory mechanisms and could provide optimal therapeutic benefit. We evaluated on spontaneously hypertensive rats the effect of 3-week period of anti-hypertensive treatment. Rats were divided into four groups: control, bisoprolol (100 mg kg-1), hydrochlorothiazide (10 mg kg-1), and their combination with low doses (10 and 1 mg kg-1, respectively). The effects of treatment were evaluated on neuro-hormonal stimulation, cardiac and vascular structure and function. The combination had synergistic anti-hypertensive effects and significantly reduced heart rate and blood pressure but to a lower extent compared with bisoprolol 100 mg kg-1. Combination therapy was associated with a lower renin activation compared to hydrochlorothiazide alone and improved endothelial function. Cardiovascular remodeling differed between the groups: with bisoprolol, cardiac hypertrophy was reduced; with the combination therapy, the aortic media/lumen ratio was most increased. The consequent shear stress reduction may explain the associated endothelial function improvement. Such favourable cardiovascular remodeling with diuretic-beta-blockade combination may participate to the long-term cardiovascular protection during anti-hypertensive treatment.
authors.affiliation: Service de Pharmacologie, CHU Pitié Salpêtrière, 47, boulevard de l'Hôpital, 75651 Paris cedex 13, France. nathalie.mougenot@chups.jussieu.fr
authors.forename: Nathalie
authors.initials: N
authors.lastname: Mougenot
authors.forename: Odile
authors.initials: O
authors.lastname: Médiani
authors.forename: Philippe
authors.initials: P
authors.lastname: Lechat
mesh_terms: D000818:Animals; D017298:Bisoprolol / Q000494:pharmacology* / Q000627:therapeutic use; D002317:Cardiovascular Agents / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D004359:Drug Therapy, Combination; D006339:Heart Rate / Q000187:drug effects / Q000502:physiology; D006852:Hydrochlorothiazide / Q000494:pharmacology* / Q000627:therapeutic use; D006973:Hypertension / Q000188:drug therapy* / Q000503:physiopathology; D008297:Male; D051381:Rats; D011918:Rats, Inbred SHR; D020257:Ventricular Remodeling / Q000187:drug effects* / Q000502:physiology
chemical_list: D002317:Cardiovascular Agents; D006852:Hydrochlorothiazide; D017298:Bisoprolol