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2016 ; 89
(3
): 612-24
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Uroplakin 1b is critical in urinary tract development and urothelial
differentiation and homeostasis
#MMPMID26880456
Carpenter AR
; Becknell MB
; Ching CB
; Cuaresma EJ
; Chen X
; Hains DS
; McHugh KM
Kidney Int
2016[Mar]; 89
(3
): 612-24
PMID26880456
show ga
Proper development and maintenance of urothelium is critical to its function.
Uroplakins are expressed in developing and mature urothelium where they establish
plaques associated with the permeability barrier. Their precise functional role
in development and disease is unknown. Here, we disrupted Upk1b in vivo where its
loss resulted in urothelial plaque disruption in the bladder and kidney.
Upk1b(RFP/RFP) bladder urothelium appeared dysplastic with expansion of the
progenitor cell markers, Krt14 and Krt5, increased Shh expression, and loss of
terminal differentiation markers Krt20 and uroplakins. Upk1b(RFP/RFP) renal
urothelium became stratified with altered cellular composition. Upk1b(RFP/RFP)
mice developed age-dependent progressive hydronephrosis. Interestingly, 16% of
Upk1b(RFP/RFP) mice possessed unilateral duplex kidneys. Our study expands the
role of uroplakins, mechanistically links plaque formation to urinary tract
development and function, and provides a tantalizing connection between
congenital anomalies of the kidney and urinary tract along with functional
deficits observed in a variety of urinary tract diseases. Thus, kidney and
bladder urothelium are regionally distinct and remain highly plastic, capable of
expansion through tissue-specific progenitor populations. Furthermore, Upk1b
plays a previously unknown role in early kidney development representing a novel
genetic target for congenital anomalies of the kidney and urinary tract.