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2017 ; 5
(11
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Cytoresistance after acute kidney injury is limited to the recovery period of
proximal tubule integrity and possibly involves Hippo-YAP signaling
#MMPMID28611154
Iwakura T
; Fujigaki Y
; Fujikura T
; Tsuji T
; Ohashi N
; Kato A
; Yasuda H
Physiol Rep
2017[Jun]; 5
(11
): ä PMID28611154
show ga
Rat proximal tubule (PT) cells that have recovered from severe acute kidney
injury induced by uranyl acetate (UA) develop cytoresistance to subsequent UA
treatments. We reported that enhanced G1 arrest might contribute to
cytoresistance. Herein, we examined these mechanisms by investigating
Yes-associated protein (YAP), a regulator of cell number, and survivin, a
downstream mediator of YAP that inhibits apoptosis. Rats pretreated with saline
(vehicle group) or UA (AKI group) were injected with UA 2 weeks, 2 months, or
6 months after treatment. Cytoresistance, evaluated by serum creatinine, was
observed at 2 weeks, was attenuated at 2 months, and was lost at 6 months in the
AKI group. Based on immunohistochemistry, overexpressed YAP/survivin in PT cells
and an increased number of PT cells was found before the second insult at
2 weeks, regressed gradually, and returned to a normal value by 6 months in the
AKI group. Cell cycle status, assessed by flow cytometry, was equivalent in all
groups before the second insult. However, early G1 phase (cyclin D1-) and p27+ PT
cells increased in the AKI group compared to those in the vehicle group until
2 months, but were comparable to those in the vehicle group at 6 months. p21+ PT
cells increased at 2 weeks, but normalized by 2 months. Thus, PT cells that have
recovered from AKI transiently overexpress YAP/survivin, probably inhibiting
apoptosis and resulting in acquired cytoresistance. This effect occurs until PT
remodeling is complete, subceullular PT integrity is restored, and cell numbers
are normalized.