Synergism of amlodipine and candesartan on blood pressure reduction and organ protection in hypertensive rats

Autor:	De-Qiu Zhu, Bing-Yi Tan, Ding-Feng Su, Ai-Jun Liu, Yan-Qiong Cheng, Wen-Zhe Dong, Xu-Hong Yu
Rok vydání:	2018
Předmět:	Male Time Factors Physiology Tetrazoles Blood Pressure 030204 cardiovascular system & hematology Pharmacology Muscle hypertrophy Rats Sprague-Dawley 03 medical and health sciences 0302 clinical medicine Heart Rate Intragastric administration Physiology (medical) Heart rate medicine Animals Amlodipine Antihypertensive Agents Dose-Response Relationship Drug Organ protection business.industry Biphenyl Compounds Drug Synergism Rats Organ damage Candesartan Blood pressure Benzimidazoles business 030217 neurology & neurosurgery medicine.drug
Zdroj:	Clinical and Experimental Pharmacology and Physiology. 45:514-524
ISSN:	0305-1870
DOI:	10.1111/1440-1681.12901
Popis:	This study was designed to investigate the possible synergism of amlodipine and candesartan on the reduction of blood pressure (BP) in hypertensive rats. The end organ protection was also observed. In acute experiment, spontaneously hypertensive rats (SHRs) were treated with intragastric administration of amlodipine (0.5, 1, 2, 3 mg/kg), candesartan (1, 2, 3, 4, 6, 8 mg/kg), and 14 different combinations to find the possible ratio of synergistic interaction. In two kidneys, one clip (2K1C) rats, the effects of amlodipine (1 mg/kg), canderastan (2 mg/kg) and their combination on BP reduction were also observed. In chronic study, SHRs were treated with amlodipine (1 mg/kg), candesartan (2 mg/kg), and their combination for 5 months. Organ damage evaluation was performed after BP recording. The probability sum test (q test) was used to evaluate the synergistic action. There is a synergistic interaction between amlodipine and candesartan on BP reduction. The optimal dose ratio is 1:2. The synergistic effect was also confirmed by 2K1C hypertensive rats. In chronic study, this combination (1:2) possessed an obvious synergism on the reduction of BP and BP variability (BPV) and protection on end organs. Multiple regression analysis showed that heart and aortic hypertrophy indexes and glomerular damage parameters were positively related to BP and BPV. In conclusion, combination of amlodipine and candesartan exhibited a potent antihypertensive effect and possessed an obvious synergism on BP reduction and organ protection in hypertension. The optimal proportion was 1:2. BP and BPV reduction may both importantly contribute to end organ protection.
Databáze:	OpenAIRE
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