TY - JOUR
T1 - The Protective Role of Natriuretic Peptide Receptor 2 against High Salt Injury in the Renal Papilla
AU - Dugbartey, George J.
AU - Quinn, Breandan
AU - Luo, Lingfeng
AU - Mickelsen, Deanne M.
AU - Ture, Sara K.
AU - Morrell, Craig N.
AU - Czyzyk, Jan
AU - Doyley, Marvin M.
AU - Yan, Chen
AU - Berk, Bradford C.
AU - Korshunov, Vyacheslav A.
N1 - Publisher Copyright:
© 2019 American Society for Investigative Pathology
PY - 2019/9
Y1 - 2019/9
N2 - Mutations in natriuretic peptide receptor 2 (Npr2) gene cause a rare form of short-limbed dwarfism, but its physiological effects have not been well studied. Human and mouse genetic data suggest that Npr2 in the kidney plays a role in salt homeostasis. Herein, we described anatomic changes within renal papilla of Npr2 knockout (Npr2−/−) mice. Dramatic reduction was found in diuresis, and albuminuria was evident after administration of 1% NaCl in drinking water in Npr2−/− and heterozygous (Npr2+/−) mice compared with their wild-type (Npr2+/+) littermates. There was indication of renal epithelial damage accompanied by high numbers of red blood cells and inflammatory cells (macrophage surface glycoproteins binding to galectin-3) and an increase of renal epithelial damage marker (T-cell Ig and mucin domain 1) in Npr2−/− mice. Addition of 1% NaCl tended to increase apoptotic cells (cleaved caspase 3) in the renal papilla of Npr2−/− mice. In vitro, genetic silencing of the Npr2 abolished protective effects of C-type natriuretic peptide, a ligand for Npr2, against death of M-1 kidney epithelial cells exposed to 360 mmol/L NaCl. Finally, significantly lower levels of expression of the NPR2 protein were detected in renal samples of hypertensive compared with normotensive human subjects. Taken together, these findings suggest that Npr2 is essential to protect renal epithelial cells from high concentrations of salt and prevent kidney injury.
AB - Mutations in natriuretic peptide receptor 2 (Npr2) gene cause a rare form of short-limbed dwarfism, but its physiological effects have not been well studied. Human and mouse genetic data suggest that Npr2 in the kidney plays a role in salt homeostasis. Herein, we described anatomic changes within renal papilla of Npr2 knockout (Npr2−/−) mice. Dramatic reduction was found in diuresis, and albuminuria was evident after administration of 1% NaCl in drinking water in Npr2−/− and heterozygous (Npr2+/−) mice compared with their wild-type (Npr2+/+) littermates. There was indication of renal epithelial damage accompanied by high numbers of red blood cells and inflammatory cells (macrophage surface glycoproteins binding to galectin-3) and an increase of renal epithelial damage marker (T-cell Ig and mucin domain 1) in Npr2−/− mice. Addition of 1% NaCl tended to increase apoptotic cells (cleaved caspase 3) in the renal papilla of Npr2−/− mice. In vitro, genetic silencing of the Npr2 abolished protective effects of C-type natriuretic peptide, a ligand for Npr2, against death of M-1 kidney epithelial cells exposed to 360 mmol/L NaCl. Finally, significantly lower levels of expression of the NPR2 protein were detected in renal samples of hypertensive compared with normotensive human subjects. Taken together, these findings suggest that Npr2 is essential to protect renal epithelial cells from high concentrations of salt and prevent kidney injury.
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U2 - 10.1016/j.ajpath.2019.05.020
DO - 10.1016/j.ajpath.2019.05.020
M3 - Article
C2 - 31220449
AN - SCOPUS:85070778885
SN - 0002-9440
VL - 189
SP - 1721
EP - 1731
JO - American Journal of Pathology
JF - American Journal of Pathology
IS - 9
ER -