Abstract
Background and aim
The infusion of chronic angiotensin II (Ang II) has been shown to promote renal interstitial fibrosis. To evaluate the pathophysiological significance of the natriuretic peptide-GC-A system, we infused Ang II (1.0 mg/kg/day) in GC-A-deficient mice (GC-A-KO).
Methods
We used 5 groups (Wild-Saline n = 12, Wild-Ang II n = 14, GC-A-KO-Saline n = 11, GC-A-KO-Ang II n = 13, and GC-A-KO-Ang II-Hydralazine n = 10). Saline or Ang II was infused subcutaneously using an osmotic minipump for 3 weeks. Hydralazine was administered orally (0.05 g/L in drinking water).
Results
Systolic blood pressure was significantly higher in the GC-A-KO-Saline group (130 ± 12 mmHg) than in the Wild-Saline group (105 ± 30 mmHg), and was similar to that in the Wild-Ang II (141 ± 17 mmHg) and GC-A-KO-Ang II-Hydralazine (140 ± 20 mmHg) groups. Systolic blood pressure was significantly higher in the GC-A-KO-Ang II group (159 ± 21 mmHg) than in the 4 other groups. Renal tubular atrophy and interstitial fibrosis were significantly more severe in the GC-A-KO-Ang II group (atrophy 13.4 %, fibrosis 12.0 %) than in the Wild-Saline (0, 2.0 %), Wild-Ang II (2.9, 4.4 %), and GC-A-KO-Saline (0, 2.6 %) groups. Hydralazine could not inhibit this aggravation (GC-A-KO-Ang II-Hydralazine 13.5, 11.3 %). The expression of monocyte chemotactic protein-1 in tubular cells, and F4/80 and alpha-smooth muscle actin in the interstitium was clearly detected in the Ang II-infused wild and GC-A-KO groups and was associated with renal tubular atrophy and interstitial fibrosis. The expression of E-cadherin in tubular cells was absent in the Ang II-infused wild and GC-A-KO groups and was associated with renal tubular atrophy.
Conclusions
The natriuretic peptide-GC-A system may play an inhibitory role in Ang II-induced renal tubular atrophy, interstitial fibrosis, and phenotypic transformation in renal tubular cells and fibroblasts.
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Acknowledgments
We thank the Howard Hughes Medical Institute for the GC-A knockout mice, Dr. Kyoko Shioya for her support, and Tamaki Mabuchi and Junko Nakamura for their excellent technical assistance. This study was supported by the Program for Promotion of Fundamental Studies in Health Sciences of the Pharmaceuticals and Medical Devices Agency (PMDA) in Japan (No. 22590906).
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Yoshihara, F., Tokudome, T., Kishimoto, I. et al. Aggravated renal tubular damage and interstitial fibrosis in mice lacking guanylyl cyclase-A (GC-A), a receptor for atrial and B-type natriuretic peptides. Clin Exp Nephrol 19, 197–207 (2015). https://doi.org/10.1007/s10157-014-0982-1
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DOI: https://doi.org/10.1007/s10157-014-0982-1