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Publication : A mouse model for the renal salt-wasting syndrome pseudohypoaldosteronism.

First Author  Hummler E Year  1997
Journal  Proc Natl Acad Sci U S A Volume  94
Issue  21 Pages  11710-5
PubMed ID  9326675 Mgi Jnum  J:43583
Mgi Id  MGI:1098070 Doi  10.1073/pnas.94.21.11710
Citation  Hummler E, et al. (1997) A mouse model for the renal salt-wasting syndrome pseudohypoaldosteronism. Proc Natl Acad Sci U S A 94(21):11710-5
abstractText  Aldosterone-dependent epithelial sodium transport in the distal nephron is mediated by the absorption of sodium through the highly selective, amiloride-sensitive epithelial sodium channel (ENaC) made of three homologous subunits (alpha, beta, and gamma). In human, autosomal recessive mutations of alpha, beta, or gammaENaC subunits cause pseudohypoaldosteronism type 1 (PHA-1), a renal salt-wasting syndrome characterized by severe hypovolemia, high plasma aldosterone, hyponatremia, life-threatening hyperkaliemia, and metabolic acidosis. In the mouse, inactivation of alphaENaC results in failure to clear fetal lung liquid at birth and in early neonatal death, preventing the observation of a PHA-1 renal phenotype. Transgenic expression of alphaENaC driven by a cytomegalovirus promoter in alphaENaC(-/-) knockout mice [alphaENaC(-/-)Tg] rescued the perinatal lethal pulmonary phenotype and partially restored Na+ transport in renal, colonic, and pulmonary epithelia. At days 5-9, however, alphaENaC(-/-)Tg mice showed clinical features of severe PHA-1 with metabolic acidosis, urinary salt-wasting, growth retardation, and 50% mortality. Adult alphaENaC(-/-)Tg survivors exhibited a compensated PHA-1 with normal acid/base and electrolyte values but 6-fold elevation of plasma aldosterone compared with wild-type littermate controls. We conclude that partial restoration of ENaC-mediated Na+ absorption in this transgenic mouse results in a mouse model for PHA-1.
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