Abstract
We aimed to investigate whether atrial natriuretic peptide (ANP) attenuates angiotensin II (Ang II)-induced myocardial remodeling and to clarify the possible molecular mechanisms involved. Thirty-five 8-week-old male Wistar–Kyoto rats were divided into control, Ang II, Ang II + ANP, and ANP groups. The Ang II and Ang II + ANP rats received 1 μg/kg/min Ang II for 14 days. The Ang II + ANP and ANP rats also received 0.1 μg/kg/min ANP intravenously. The Ang II and Ang II + ANP rats showed comparable blood pressure. Left ventricular fractional shortening and ejection fraction were lower in the Ang II rats than in controls; these indices were higher (P < 0.001) in the Ang II + ANP rats than in the Ang II rats. In the Ang II rats, the peak velocity of mitral early inflow and its ratio to atrial contraction-related peak flow velocity were lower, and the deceleration time of mitral early inflow was significantly prolonged; these changes were decreased by ANP. Percent fibrosis was higher (P < 0.001) and average myocyte diameters greater (P < 0.01) in the Ang II rats than in controls. ANP decreased both myocardial fibrosis (P < 0.01) and myocyte hypertrophy (P < 0.01). Macrophage infiltration, expression of mRNA levels of collagen types I and III, monocyte chemotactic protein-1, and a profibrotic/proinflammatory molecule, tenascin-C (TN-C) were increased in the Ang II rats; ANP significantly decreased these changes. In vitro, Ang II increased expression of TN-C and endothelin-1 (ET-1) in cardiac fibroblasts, which were reduced by ANP. ET-1 upregulated TN-C expression via endothelin type A receptor. These results suggest that ANP may protect the heart from Ang II-induced remodeling by attenuating inflammation, at least partly through endothelin 1/endothelin receptor A cascade.
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Acknowledgments
The authors thank M. Namikata for providing technical assistance, and also thank Dr Y. Ito (Division of Life Sciences, Department of Anatomy and Cell Biology, Osaka Medical College) for her excellent advice on confocal laser scanning microscopy, and A. Yamaki (ASUBIO Pharma Co., Ltd) for helpful discussion on the protocol design. This work was supported by JSPS Grants-in-Aid for Scientific Research #21590927(to K. I-Y.), and a research grant for intractable diseases from the Ministry of Health, Labor and Welfare of Japan (to K. I-Y. and Y. K.). Part of the study was also supported by a grant by Daiichi-Sankyo Co. Ltd.
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Fujita, S., Shimojo, N., Terasaki, F. et al. Atrial natriuretic peptide exerts protective action against angiotensin II-induced cardiac remodeling by attenuating inflammation via endothelin-1/endothelin receptor A cascade. Heart Vessels 28, 646–657 (2013). https://doi.org/10.1007/s00380-012-0311-0
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DOI: https://doi.org/10.1007/s00380-012-0311-0