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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Am+J+Transplant 2014 ; 14 (7): 1552-61 Nephropedia Template TP
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ATF6 Mediates a Pro-inflammatory Synergy between ER Stress and TLR Activation in the Pathogenesis of Liver Ischemia Reperfusion Injury #MMPMID24903305
Rao J; Yue S; Fu Y; Zhu J; Wang X; Busuttil RW; Kupiec-Weglinski JW; Lu L; Zhai Y
Am J Transplant 2014[Jul]; 14 (7): 1552-61 PMID24903305show ga
Although roles of the metabolic stress in organ ischemia reperfusion injury (IRI) have been well recognized, the question of whether and how these stress responses regulate innate immune activation against IR remains unclear. In a murine liver partial warm ischemia mode, we showed that prolonged ischemia triggered endoplasmic reticulum (ER) stress response, particularly, the ATF6 branch, in liver Kupffer cells and altered their responsiveness against TLR stimulation. Ischemia-primed cells increased pro-, but decreased anti-, inflammatory cytokine productions. Alleviation of ER stress in vivo by small chemical chaperon 4-phenylbutyrate or ATF6 siRNA diminished the pro-inflammatory priming effect of ischemia in KCs, leading to the inhibition of liver immune response against IR and protection of livers from IRI. In vitro, ATF6 siRNA abrogated the ER stress-mediated pro-inflammatory enhancement of macrophage TLR4 response, by restricting NF-kB and restoring Akt activations. Thus, ischemia primes liver innate immune cells by ATF6-mediated ER stress response. The IR-induced metabolic stress and TLR activation function in synergy to activate tissue inflammatory immune response.