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2017 ; 2017
(ä): 5031926
Nephropedia Template TP
Hong YA
; Yang KJ
; Jung SY
; Park KC
; Choi H
; Oh JM
; Lee SJ
; Chang YK
; Park CW
; Yang CW
; Kim SY
; Hwang HS
Oxid Med Cell Longev
2017[]; 2017
(ä): 5031926
PMID28465762
show ga
The protective mechanism of paricalcitol remains unclear in renal
ischemia-reperfusion (IR) injury. We investigated the renoprotective effects of
paricalcitol in IR injury through the prostaglandin E(2) (PGE(2)) receptor EP4.
Paricalcitol was injected into IR-exposed HK-2 cells and mice subjected to
bilateral kidney ischemia for 23?min and reperfusion for 24?hr. Paricalcitol
prevented IR-induced cell death and EP4 antagonist cotreatment offset these
protective effects. Paricalcitol increased phosphorylation of Akt and cyclic AMP
responsive element binding protein (CREB) and suppressed nuclear factor-?B
(NF-?B) in IR-exposed cells and cotreatment of EP4 antagonist or EP4 small
interfering RNA blunted these signals. In vivo studies showed that paricalcitol
improved renal dysfunction and tubular necrosis after IR injury and cotreatment
with EP4 antagonist inhibited the protective effects of paricalcitol.
Phosphorylation of Akt was increased and nuclear translocation of p65 NF-?B was
decreased in paricalcitol-treated mice with IR injury, which was reversed by EP4
blockade. Paricalcitol decreased oxidative stress and apoptosis in renal IR
injury. Paricalcitol also attenuated the infiltration of inflammatory cells and
production of proinflammatory cytokines after IR injury. EP4 antagonist abolished
these antioxidant, anti-inflammatory, and antiapoptotic effects. The EP4 plays a
pivotal role in the protective effects of paricalcitol in renal IR injury.
|Animals
[MESH]
|Apoptosis/*drug effects
[MESH]
|Ergocalciferols
[MESH]
|Kidney Diseases/metabolism/pathology/*prevention & control
[MESH]
|Kidney/*metabolism/pathology
[MESH]
|Male
[MESH]
|Mice
[MESH]
|Oxidative Stress/*drug effects
[MESH]
|Proto-Oncogene Proteins c-akt/metabolism
[MESH]
|Receptors, Prostaglandin E, EP4 Subtype/*metabolism
[MESH]
|Reperfusion Injury/metabolism/pathology/*prevention & control
[MESH]