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An effective antidotal combination of polymyxin B and methylprednisolone for α-amanitin intoxication

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Abstract

Amanita phalloides is one of the most toxic mushrooms worldwide, and it is involved in the majority of human fatal cases of mushroom poisoning. α-Amanitin, the most deleterious toxin of A. phalloides to humans, inhibits RNA polymerase II (RNAPII), causing hepatic and renal failure. Previously, we have shown that polymyxin B (polB) reverts α-amanitin inhibition of RNAPII, although it was not able to guarantee the full survival of α-amanitin-intoxicated mice or prevent α-amanitin pro-inflammatory effects. α-Amanitin is also a substrate of the organic-anion-transporting polypeptide 1B3 (OATP1B3) and Na(+)-taurocholate cotransporter polypeptide (NTCP) transporters. Therefore, in the present work, we used a combination of polB [(2.5 mg/kg intraperitoneal (i.p.)] with the anti-inflammatory and NTCP inhibitor drug, methylprednisolone (MP) (10 mg/kg i.p.), as an attempt to fully revert α-amanitin-induced toxicity (0.33 mg/kg i.p.) in CD-1 mice. Results showed that the administration of the polB + MP combination, 4 h after α-amanitin, led to the full survival of the intoxicated animals, with a significant attenuation of α-amanitin-induced renal and hepatic necrosis. Also, the combination polB + MP led to a decrease of aminotransferase plasma levels, of the renal myeloperoxidase activity and of renal inflammatory cell infiltrate promoted by α-amanitin, although not preventing any of the hepatic pro-inflammatory effect of the toxin. The obtained results indicate that this combination may represent an important and valuable therapeutic approach to be used against α-amanitin intoxication.

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Abbreviations

AP:

Alkaline phosphatase

ALT:

Alanine aminotransferase

AST:

Aspartate aminotransferase

MLD:

Minimum lethal dose

MPO:

Myeloperoxidase

NF-κB:

Nuclear factor kappa-B

NTCP:

Na(+)-taurocholate cotransporter polypeptide

OATP:

Organic-anion-transporting polypeptide

TMB:

3,3′,5,5′-tetramethylbenzidine

RNAPII:

RNA polymerase II

TNF-α:

Tumor necrosis factor-α.

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Acknowledgements

We greatly acknowledge Dra Laura Pereira and Master Bárbara Duarte for their technical assistance in the determination of plasma parameters. VMC thanks Fundação para a Ciência e Tecnologia (FCT) for her grant SFRH/BPD/110001/2015. This work was supported by FEDER funds through the Operational Programme for Competitiveness Factors—COMPETE and by national funds by the Fundação para a Ciência e Tecnologia (FCT) within the project “PTDC/DTP-FTO/4973/2014– POCI-01-0145-FEDER- 016545”.

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Correspondence to Juliana Garcia or Félix Carvalho.

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Garcia, J., Costa, V.M., Bovolini, A. et al. An effective antidotal combination of polymyxin B and methylprednisolone for α-amanitin intoxication. Arch Toxicol 93, 1449–1463 (2019). https://doi.org/10.1007/s00204-019-02426-5

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