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Effect of chronic captopril treatment on circulating and tissue renin-angiotensin system in SHR rats

  
@article{APS7102,
	author = {Wen-Yang Hu and Da-Guang Chen and Song-Cang Chen and Xue-Qing Jin and Hua-Jun Wang},
	title = {Effect of chronic captopril treatment on circulating and tissue renin-angiotensin system in SHR rats},
	journal = {Acta Pharmacologica Sinica},
	volume = {17},
	number = {6},
	year = {2016},
	keywords = {},
	abstract = {AIM: To study the effect of captopril treatment and its withdrawal on the circulating and tissue peptidyl-dipeptidase A, angiotensinogen (AGT), and angiotensin II (A II), in relation to left ventricular hypertrophy (LVH) and systolic blood pressure (SBP).
METHODS: SHR male rats were given captopril 100 mg.kg-1.d-1 [SHRcap, number (n) = 43] orally in mixture with milk powder as vehicle from intrautero period of 16 wk of age. Rats were killed at 16 (n = 19) and 40 (n = 24) wk of age, respectively. Male, age-matched untreated SHR and WKY rats served as controls. SBP, left ventricular mass/body weight (LVM/BW) ratio, left ventricular (LV) myocardium and plasma A II concentration, aortic and serum peptidyl-dipeptidase A activity, AGT mRNA level in kidney and liver, renal renin mRNA level were determined.
RESULTS: Captopril treatment decreased SBP and reduced LVM/BW at 16 and 40 wk of age, and persistently inhibited LV myocardium A II, aortic peptidyl-dipeptidase A activity, and AGT gene expression in kidney even after the treatment was removed. Nevertheless, no changes were found in plasma A II concentration, serum peptidyl-dipeptidase A activity, and AGT mRNA level in liver by captopril therapy. Renal renin mRNA level was low in SHR and WKY rats, but it was increased by captopril treatment. Tissue renin-angiotensin system (RAS) such as AGT mRNA in kidney, aortic peptidyl-dipeptidase A activity, and LV myocardium A II, rather than circulating RAS (AGT mRNA in liver, renin mRNA in kidney, serum peptidyl-dipeptidase A activity and plasma A II), were persistently inhibited by early captopril treatment, even after the withdrawal of the treatment.
CONCLUSION: The long-term inhibition of tissue RAS is one of the mechanisms of the persistent hypotensive effect of captopril treatment.},
	issn = {1745-7254},	url = {http://www.chinaphar.com/article/view/7102}
}