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2017 ; 12
(11
): e0186769
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Point mutation in D8C domain of Tamm-Horsfall protein/uromodulin in transgenic
mice causes progressive renal damage and hyperuricemia
#MMPMID29145399
Ma L
; Liu Y
; Landry NK
; El-Achkar TM
; Lieske JC
; Wu XR
PLoS One
2017[]; 12
(11
): e0186769
PMID29145399
show ga
Hereditary mutations in Tamm-Horsfall protein (THP/uromodulin) gene cause
autosomal dominant kidney diseases characterized by juvenile-onset hyperuricemia,
gout and progressive kidney failure, although the disease pathogenesis remains
unclear. Here we show that targeted expression in transgenic mice of a mutation
within the domain of 8 cysteines of THP in kidneys' thick ascending limb (TAL)
caused unfolded protein response in younger (1-month old) mice and apoptosis in
older (12-month old) mice. While the young mice had urine concentration defects
and polyuria, such defects progressively reversed in the older mice to marked
oliguria, highly concentrated urine, fibrotic kidneys and reduced creatinine
clearance. Both the young and the old transgenic mice had significantly higher
serum uric acid and its catabolic product, allantoin, than age-matched wild-type
mice. This THP mutation apparently caused primary defects in TAL by compromising
the luminal translocation and reabsorptive functions of NKCC2 and ROMK and
secondary responses in proximal tubules by upregulating NHE3 and URAT1. Our
results strongly suggest that the progressive worsening of kidney functions
reflects the accumulation of the deleterious effects of the misfolded mutant THP
and the compensatory responses. Transgenic mice recapitulating human
THP/uromodulin-associated kidney diseases could be used to elucidate their
pathogenesis and test novel therapeutic strategies.