| Autor: |
Carvalho-Galvão A; Department of Biotechnology, Center of Biotechnology, Federal University of Paraíba, João Pessoa, Brazil., Gadelha DDA; Department of Biotechnology, Center of Biotechnology, Federal University of Paraíba, João Pessoa, Brazil., de Brito Alves JL; Department of Nutrition, Health Sciences Center, Federal University of Paraíba, João Pessoa, Brazil., Khan BA; Faculty of Pharmacy, Gomal University, Dera Ismail Khan, Pakistan., Castro-Gomez RJH; Department of Foods Engineering, Technology Center, Federal University of Paraíba, João Pessoa, Brazil., Cruz JC; Department of Biotechnology, Center of Biotechnology, Federal University of Paraíba, João Pessoa, Brazil., Magnani M; Department of Foods Engineering, Technology Center, Federal University of Paraíba, João Pessoa, Brazil., Braga VA; Department of Biotechnology, Center of Biotechnology, Federal University of Paraíba, João Pessoa, Brazil. |
| Abstrakt: |
This study was designed to investigate the effects of a newly synthesized carboxymethyl-glucan (CM-G) on blood pressure (BP), baroreflex sensitivity (BRS) and sympathetic vascular modulation in renovascular hypertensive rats. Male Wistar rats were divided into four groups: Sham ( n = 10); 2K1C (subjected to renal artery clipping to induce renovascular hypertension, n = 10); Sham + CM-G (treated with CM-G, n = 7) and 2K1C + CM-G (treated with CM-G, n = 7). The daily treatment with CM-G (40 mg/kg) was performed for 2 weeks. Blood pressure, heart rate (HR), systolic BP variability, baroreflex sensitivity (BRS) and sympathetic vascular tone were evaluated. After six weeks of renal artery clipping, 2K1C rats exhibited arterial hypertension (171 ± 11 vs. 118 ± 4 mmHg, p < 0.05), impaired BRS (-1.30 ± 0.10 vs. -2.59 ± 0.17 bpm.mmHg-1, p < 0.05) and enhanced sympathetic activity as shown by the hexamethonium test (-60 ± 5 vs. -33 ± 2 ΔmmHg, p < 0.05) when compared to sham rats. Oral administration of CM-G in renovascular hypertensive rats reduced hypertension (126 ± 4 vs. 171 ± 11 mmHg, p < 0.05) and improved the BRS (-2.03 ± 0.16 vs. -1.30 ± 0.10 bpm.mmHg -1 , p < 0.05) in 2K1C rats when compared to placebo. Those effects seem to be caused by a reduction in sympathetic activity. The present study revealed for the first time that CM-G treatment reduces arterial hypertension and restores arterial baroreflex sensitivity via a reduction in the sympathetic tone in conscious renovascular hypertensive rats. |
