Article (Scientific journals)
ADP and P2Y13 receptor are involved in the autophagic protection of ex vivo perfused livers from fasted rats: Potential benefit for liver graft preservation.
Papegay, Bérengère; Nuyens, Vincent; Albert, Adelin et al.
2020In Liver Transplantation
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Keywords :
AMPK; HMGB1; cell signalling; liver cytolysis enzyme markers; organ protection and diet restriction
Abstract :
[en] Studies on how to protect livers perfused ex vivo can help design strategies for hepatoprotection and liver graft preservation. Protection of livers isolated from 24- vs. 18-h-starved rats has been previously attributed to autophagy, which contributes to the energy-mobilizing capacity ex vivo. Here, we explored the signaling pathways responsible for this protection. In our experimental models, three major signaling candidates were considered in view of their abilities to trigger autophagy: HMGB1, AMPK, and purinergic receptor P2Y13. To this end, ex vivo livers isolated from starved rats were perfused for 135 min, after which perfusate samples were studied for protein release and biopsies were performed for evaluating signaling protein contents. For HMGB1, no significant difference was observed between livers isolated from rats starved for 18 and 24 h at perfusion times of both 0 and 135 min. The phosphorylated and total forms of AMPK, but not their ratio, were significantly higher in 24-h-fasted than in 18-h-fasted livers. However, although the level of phosphorylated AMPK increased, perfusing ex vivo 18-h-fasted livers with 1 mM AICAR, an AMPK activator, did not protect the livers. Additionally, ADP (and not AMP) to AMP+ADP+ATP ratio increased in 24-h-starved livers compared to that in 18-h-starved livers. Moreover, perfusing 24-h-starved livers with 0.1 mM MRS2211, a specific antagonist of P2Y13 receptor, induced an increase in cytolysis marker levels in the perfusate samples and a decrease in the levels of autophagic marker LC3II/actin (and loss of p62/actin decrease), indicating autophagy inhibition and loss of protection. Conclusion: The P2Y13 receptor and ADP (a physiological activator of this receptor) are involved in the protection of ex vivo livers. Therapeutic opportunities for improving liver graft preservation through the stimulation of the ADP-P2Y13 receptor axis are further discussed.
Disciplines :
Anesthesia & intensive care
Author, co-author :
Papegay, Bérengère;  CHU Charleroi > Anesthésiologie
Nuyens, Vincent;  CHU Charleroi
Albert, Adelin  ;  Université de Liège - ULiège > Département des sciences de la santé publique > Département des sciences de la santé publique
Cherkaoui-Malki, Mustapha
Andreoletti, Pierre
Leo, Oberdan
Kruys, Véronique;  Université Libre de Bruxelles - ULB
Boogaerts, Jean G.;  CHU Charleroi > Anesthésiologie
Vamecq, Joseph;  INSERM
Language :
English
Title :
ADP and P2Y13 receptor are involved in the autophagic protection of ex vivo perfused livers from fasted rats: Potential benefit for liver graft preservation.
Publication date :
2020
Journal title :
Liver Transplantation
ISSN :
1527-6465
eISSN :
1527-6473
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
This article is protected by copyright. All rights reserved.
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