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1 Department of Anesthesiology, College of Physicians and Surgeons of Columbia University, New York, NY, USA
* To whom correspondence should be addressed. E-mail: tl128{at}columbia.edu.
Renal ischemia reperfusion (IR) injury is a major clinical problem without
effective therapy. We recently reported that volatile anesthetics protect against renal IR
injury in part via their anti-inflammatory properties. In this study, we demonstrate the
anti-inflammatory and anti-necrotic effects of sevoflurane in cultured kidney proximal
tubule cells and probed the mechanisms of sevoflurane-induced renal cellular protection.
To mimic inflammation, human kidney proximal tubule (HK-2) cells were treated with
tumor necrosis factor-alpha (TNF-
, 25 ng/ml) in the presence or absence of sevoflurane.
In addition, we studied the effects of sevoflurane pretreatment on hydrogen peroxide
(H2O2)-induced necrotic cell death in HK-2 or porcine proximal tubule (LLC-PK1) cells.
We demonstrate that sevoflurane suppressed pro-inflammatory effects of TNF-
evidenced by attenuated up-regulation of pro-inflammatory cytokine mRNA (TNF-
,
MCP-1) and ICAM-1 protein and reduced nuclear translocation of the pro-inflammatory
transcription factors NF-
B and AP-1. Sevoflurane reduced necrotic cell death induced
with H2O2 in HK-2 cells as well as in LLC-PK1 cells. Sevoflurane treatment resulted in
phosphorylation of pro-survival kinases, ERK and Akt, and increased de novo HSP70
protein synthesis without affecting the synthesis of HSP27 or HSP32. We conclude that
sevoflurane has direct anti-inflammatory and anti-necrotic effects in vitro in a renal cell
type particularly sensitive to injury following IR injury. These mechanisms may in part
account for volatile anesthetics' protective effects against renal IR injury.
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