Yuan YM, Luo L, Guo Z, Yang M, Ye RS, Luo C. Activation of renin-angiotensin-aldosterone system (RAAS) in the lung of smoking-induced pulmonary arterial hypertension (PAH) rats.
J Renin Angiotensin Aldosterone Syst 2015;
16:249-53. [PMID:
25795458 PMCID:
PMC7234796 DOI:
10.1177/1470320315576256]
[Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 12/23/2014] [Indexed: 02/05/2023] Open
Abstract
Objectives:
To explore the role of the renin–angiotensin–aldosterone system (RAAS) in the
pathogenesis of pulmonary arterial hypertension (PAH) induced by chronic
exposure to cigarette smoke.
Methods:
48 healthy male SD rats were randomly divided into four groups (12/group):
control group (group A); inhibitor alone group (group B); cigarette
induction group (group C); cigarette induction + inhibitor group (group D).
After the establishment of smoking-induced PAH rat model, the right
ventricular systolic pressure (RVSP) was detected using an inserted
catheter; western blotting was used to detect the protein expression of
angiotensin-converting enzyme-2 (ACE2) and angiotensin-converting enzyme
(ACE); expression levels of angiotensin II (AngII) in lung tissue were
measured by radioimmunoassay.
Results:
After six months of cigarette exposure, the RVSP of chronic cigarette
induction group was significantly higher than that of the control group;
expression levels of AngII and ACE increased in lung tissues, but ACE2
expression levels reduced. Compared with cigarette exposure group, after
losartan treatment, RVSP, ACE and AngII obviously decreased
(P<0.05), and ACE2 expression levels significantly
increased.
Conclusion:
Chronic cigarette exposure may result in PAH and affect the protein
expression of ACE2 and ACE in lung tissue, suggesting that ACE2 and ACE play
an important role in the pathogenesis of smoking-induced PAH.
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