Potent inhibition of tumour cell proliferation and immunoregulatory function by mitochondria-targeted atovaquone.

Abstract:

:The FDA-approved prophylactic antimalarial drug atovaquone (ATO) recently was repurposed as an antitumor drug. Studies show that ATO exerts a profound antiproliferative effect in several cancer cells, including breast, ovarian, and glioma. Analogous to the mechanism of action proposed in parasites, ATO inhibits mitochondrial complex III and cell respiration. To enhance the chemotherapeutic efficacy and oxidative phosphorylation inhibition, we developed a mitochondria-targeted triphenylphosphonium-conjugated ATO with varying alkyl side chains (Mito4-ATO, Mito10-ATO, Mito12-ATO, and Mito16-ATO). Results show, for the first time, that triphenylphosphonium-conjugated ATO potently enhanced the antiproliferative effect of ATO in cancer cells and, depending upon the alkyl chain length, the molecular target of inhibition changes from mitochondrial complex III to complex I. Mito4-ATO and Mito10-ATO inhibit both pyruvate/malate-dependent complex I and duroquinol-dependent complex III-induced oxygen consumption whereas Mito12-ATO and Mito16-ATO inhibit only complex I-induced oxygen consumption. Mitochondrial target shifting may have immunoregulatory implications.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Cheng G,Hardy M,Topchyan P,Zander R,Volberding P,Cui W,Kalyanaraman B

doi

10.1038/s41598-020-74808-0

subject

Has Abstract

pub_date

2020-10-21 00:00:00

pages

17872

issue

1

issn

2045-2322

pii

10.1038/s41598-020-74808-0

journal_volume

10

pub_type

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