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PT exerts its pathogenic effects by ADP-ribosylating heterotrimeric G proteins, disrupting cellular signaling pathways. Here, we investigate the potential of two antiarrhythmic drugs, amiodarone and dronedarone, in mitigating PT-induced cellular intoxication. After binding to cells, PT is endocytosed, transported from the Golgi to the endoplasmic reticulum where the enzyme subunit PTS1 is released from the transport subunit of PT. PTS1 is translocated into the cytosol where it ADP-ribosylates inhibitory \u03b1-subunit of G-protein coupled receptors (G\u03b1i). We showed that amiodarone and dronedarone protected CHO cells and human A549 cells from PT-intoxication by analyzing the ADP-ribosylation status of G\u03b1i. Amiodarone had no effect on PT binding to cells or in vitro enzyme activity of PTS1 but reduced the signal of PTS1 in the cell suggesting that amiodarone interferes with intracellular transport of PTS1. Moreover, dronedarone mitigated the PT-mediated effect on cAMP signaling in a cell-based bioassay. Taken together, our findings underscore the inhibitory effects of amiodarone and dronedarone on PT-induced cellular intoxication, providing valuable insights into drug repurposing for infectious disease management.<\/jats:p>","DOI":"10.1007\/s00210-024-03247-9","type":"journal-article","created":{"date-parts":[[2024,7,3]],"date-time":"2024-07-03T14:03:03Z","timestamp":1720015383000},"page":"9991-10003","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["The antiarrhythmic drugs amiodarone and dronedarone inhibit intoxication of cells with pertussis toxin"],"prefix":"10.1007","volume":"397","author":[{"given":"Jinfang","family":"Jia","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stefanie","family":"Lietz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2706-3402","authenticated-orcid":false,"given":"Holger","family":"Barth","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9832-9917","authenticated-orcid":false,"given":"Katharina","family":"Ernst","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,7,3]]},"reference":[{"key":"3247_CR1","doi-asserted-by":"publisher","first-page":"1413","DOI":"10.1021\/acschemneuro.0c00042","volume":"11","author":"LB Allen","year":"2020","unstructured":"Allen LB, Genaro-Mattos TC, Anderson A et al (2020) Amiodarone alters cholesterol biosynthesis through tissue-dependent inhibition of emopamil binding protein and dehydrocholesterol reductase 24. 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