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2015 ; 26
(7
): 1537-48
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Hypertrophy in the Distal Convoluted Tubule of an 11?-Hydroxysteroid
Dehydrogenase Type 2 Knockout Model
#MMPMID25349206
Hunter RW
; Ivy JR
; Flatman PW
; Kenyon CJ
; Craigie E
; Mullins LJ
; Bailey MA
; Mullins JJ
J Am Soc Nephrol
2015[Jul]; 26
(7
): 1537-48
PMID25349206
show ga
Na(+) transport in the renal distal convoluted tubule (DCT) by the
thiazide-sensitive NaCl cotransporter (NCC) is a major determinant of total body
Na(+) and BP. NCC-mediated transport is stimulated by aldosterone, the dominant
regulator of chronic Na(+) homeostasis, but the mechanism is controversial.
Transport may also be affected by epithelial remodeling, which occurs in the DCT
in response to chronic perturbations in electrolyte homeostasis. Hsd11b2(-/-)
mice, which lack the enzyme 11?-hydroxysteroid dehydrogenase type 2 (11?HSD2) and
thus exhibit the syndrome of apparent mineralocorticoid excess, provided an ideal
model in which to investigate the potential for DCT hypertrophy to contribute to
Na(+) retention in a hypertensive condition. The DCTs of Hsd11b2(-/-) mice
exhibited hypertrophy and hyperplasia and the kidneys expressed higher levels of
total and phosphorylated NCC compared with those of wild-type mice. However, the
striking structural and molecular phenotypes were not associated with an increase
in the natriuretic effect of thiazide. In wild-type mice, Hsd11b2 mRNA was
detected in some tubule segments expressing Slc12a3, but 11?HSD2 and NCC did not
colocalize at the protein level. Thus, the phosphorylation status of NCC may not
necessarily equate to its activity in vivo, and the structural remodeling of the
DCT in the knockout mouse may not be a direct consequence of aberrant
corticosteroid signaling in DCT cells. These observations suggest that the
conventional concept of mineralocorticoid signaling in the DCT should be revised
to recognize the complexity of NCC regulation by corticosteroids.
|11-beta-Hydroxysteroid Dehydrogenase Type 2/metabolism/*pharmacology
[MESH]