Involvement of connexin43 in acetaminophen-induced liver injury

Michaël Maes, Mitchell R. Mcgill, Tereza Cristina da Silva, Chloé Abels, Margitta Lebofsky, Cintia Maria Monteiro de Araújo, Taynã Tiburcio, Isabel Veloso Alves Pereira, Joost Willebrords, Sara Crespo Yanguas, Anwar Farhood, Alain Beschin, Jo Van Ginderachter, Maria Lucia Zaidan Dagli, Hartmut Jaeschke, Bruno Cogliati, Mathieu Vinken

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Background and aims

Being goalkeepers of liver homeostasis, gap junctions are also involved in hepatotoxicity. However, their role in this process is ambiguous, as gap junctions can act as both targets and effectors of liver toxicity. This particularly holds true for drug-induced liver insults. In the present study, the involvement of connexin 26, connexin32 and connexin43, the building blocks of liver gap junctions, was investigated in acetaminophen-induced hepatotoxicity.

Methods

C57BL/6 mice were overdosed with 300 mg/kg body weight acetaminophen followed by analysis of the expression and localization of connexins as well as monitoring of hepatic gap junction functionality. Furthermore, acetaminophen-induced liver injury was compared between mice genetically deficient in connexin43 and wild type littermates. Evaluation of the toxicological response was based on a set of clinically relevant parameters, including protein adduct formation, measurement of alanine aminotransferase activity, cytokines and glutathione.

Results

It was found that gap junction communication deteriorates upon acetaminophen intoxication in wild type mice, which is associated with a switch in mRNA and protein production from connexin32 and connexin26 to connexin43. The upregulation of connexin43 expression is due, at least in part, to de novo production by hepatocytes. Connexin43-deficient animals tended to show increased liver cell death, inflammation and oxidative stress in comparison with wild type counterparts.

Conclusion

These results suggest that hepatic connexin43-based signaling may protect against acetaminophen-induced liver toxicity.
Original languageEnglish
Pages (from-to)1111-1121
Number of pages11
JournalBiochimica et Biophysica Acta - Molecular Basis of Disease
Volume1862
Issue number6
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • connexin
  • acetaminophen
  • hepatotoxicity

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