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- Title
INHIBITION OF LEFT VENTRICULAR REMODELLING IN SPONTANEOUSLY HYPERTENSIVE RATS by G<sub>αq</sub>-PROTEIN CARBOXYL TERMINUS IMITATION POLYPEPTIDE GCIP-27 IS NOT ENTIRELY DEPENDENT ON BLOOD PRESSURE.
- Authors
Wang, Xiu-Qin; Zhang, Hai-Gang; Cheng, Yi-Qun; Li, Xiao-Hui
- Abstract
1. The Gq-protein is located at the convergent point in the signal transduction pathway that leads to ventricular remodelling. In G-protein signalling pathways, the carboxyl terminus of the Gα-subunit plays a vital role in G-protein–receptor interaction. The aim of the present study was to explore the effects of a synthetic Gαq carboxyl terminus imitation peptide, namely GCIP-27, on left ventricular (LV) remodelling and blood pressure in spontaneous hypertensive rats (SHR). 2. In the present study, 10, 30 or 90 µg/kg, i.p., GCIP-27 was administered for 8 weeks to SHR. In addition, another two groups of SHR were treated with either 6 mg/kg losartan or vehicle (saline). Wistar-Kyoto rats were used as controls. Systolic blood pressure (SBP) was measured using the standard tail-cuff method once every 2 weeks. At the end of the experiment, the LV mass index (LVMI) was evaluated. In addition, LV structure and function, collagen content, microstructure and ultrastructure were examined using echocardiography, the hydroxyproline assay, routine light microscopy and transmission electron microscopy, respectively. 3. In the losartan- and GCIP-27 (10, 30 and 90 µg/kg)-treated groups, SBP was decreased significantly compared with that of the vehicle (saline) group. However, even at the highest concentration used, the hypotensive effect of GCIP-27 was weaker than that of losartan. For example, after 8 weeks treatment, SBP had decreased by 30.4% in the losartan-treated group compared with decreases of 10.5, 13.1 and 18.5% in the 10, 30 and 90 µg/kg GCIP-27-treated groups, respectively. 4. Both GCIP-27 (10, 30 and 90 µg/kg) and losartan (6 mg/kg) significantly reduced LV posterior wall thickness, the thickness of the interventricular septum, collagen content and LVMI, with the effects of GCIP-27 at all three concentrations tested being greater than those of losartan. 5. In conclusion, GCIP-27 effectively attenuates LV remodelling in SHR and the antiremodelling effect may not be dependent entirely on decreases in blood pressure.
- Subjects
LEFT heart ventricle; BLOOD pressure; HYPERTENSION; POLYPEPTIDES
- Publication
Clinical & Experimental Pharmacology & Physiology, 2008, Vol 35, Issue 10, p1215
- ISSN
0305-1870
- Publication type
Article
- DOI
10.1111/j.1440-1681.2008.04981.x