Triggering tumorigenic signaling: Succinate dehydrogenase inhibitor (SDHi) fungicides induce oncometabolite accumulation and metabolic shift in human colon cells

Succinate dehydrogenase inhibitors (SDHi) are fungicides used worldwide to control the proliferation of fungi in crops. They act by blocking the activity of succinate dehydrogenase (SDH), a universal enzyme involved in mitochondrial functions and metabolism. While SDH-encoding genes are tumour suppressors, which loss-of-function mutations predispose to different types of rare tumors in humans, the consequences of chemical inactivation of SDH by SDHi remain largely unknown, particularly regarding their carcinogenic potential. Here, we investigated the metabolic and cellular impact of SDHi on human non-cancer and transformed colon cells. We show that SDHi inhibit SDH activity and increase the level of succinate, known to act as an oncometabolite in SDH-deficient cancers. SDHi exposure also induces a Warburg-like metabolic reprogramming typical of cancer cells, associated with transcriptomic and morphological changes promoting cell migration and invasion. These effects are enhanced in transformed colon cells carrying mutations in colorectal cancer (CRC) driver genes. These findings provide the first evidence that SDHi-mediated chemical inactivation of SDH mimics some metabolic and phenotypic features previously described in human tumors with SDH genetic deficiencies. Given that loss of SDH expression in CRC patients correlates with a poor prognosis, these patients could represent a population sensitive to SDHi exposure. Therefore, it would be wise to include them in biomonitoring programs. Finally, our work highlights the need to improve regulatory assessment procedures to take better account of SDHi mode of action, by developing relevant tests to cover the multiple key events linked to SDH inactivation and assess the resulting mitochondrial toxicity.

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Publication Details

Journal
Environment International
Published
2025-05-01
DOI
https://doi.org/10.1016/j.envint.2025.109503
Citations
2
Primary Topic
Colorectal Cancer Treatments and Studies
Type
article
Field-Weighted Citation Impact
2.09

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article

Triggering tumorigenic signaling: Succinate dehydrogenase inhibitor (SDHi) fungicides induce oncometabolite accumulation and metabolic shift in human colon cells

Sandrine Ellero‐Simatos, Arnaud Tête, Lara Gales, Fatima Djouadi et al.
2 citations
Environment International
Colorectal Cancer Treatments and Studies
2.09
article

Triggering tumorigenic signaling: Succinate dehydrogenase inhibitor (SDHi) fungicides induce oncometabolite accumulation and metabolic shift in human colon cells

Sandrine Ellero‐Simatos, Arnaud Tête, Lara Gales, Fatima Djouadi, Judith Favier, Sylvie Bortoli, Robert Barouki, Sophie Mouillet‐Richard, Clémence Rives, Xavier Coumoul, Julien Dairou, Anthony Lemarié, A. Hagimont, Floriant Bellvert, Jean Bastin, Jerry W. Shay, Dominique Lagadic‐Gossmann, Kloé Debizet, Agnès Burel, Jules Imler, Sofiane Safi-Stibler
article en
2 citations

Abstract

Succinate dehydrogenase inhibitors (SDHi) are fungicides used worldwide to control the proliferation of fungi in crops. They act by blocking the activity of succinate dehydrogenase (SDH), a universal enzyme involved in mitochondrial functions and metabolism. While SDH-encoding genes are tumour suppressors, which loss-of-function mutations predispose to different types of rare tumors in humans, the consequences of chemical inactivation of SDH by SDHi remain largely unknown, particularly regarding their carcinogenic potential. Here, we investigated the metabolic and cellular impact of SDHi on human non-cancer and transformed colon cells. We show that SDHi inhibit SDH activity and increase the level of succinate, known to act as an oncometabolite in SDH-deficient cancers. SDHi exposure also induces a Warburg-like metabolic reprogramming typical of cancer cells, associated with transcriptomic and morphological changes promoting cell migration and invasion. These effects are enhanced in transformed colon cells carrying mutations in colorectal cancer (CRC) driver genes. These findings provide the first evidence that SDHi-mediated chemical inactivation of SDH mimics some metabolic and phenotypic features previously described in human tumors with SDH genetic deficiencies. Given that loss of SDH expression in CRC patients correlates with a poor prognosis, these patients could represent a population sensitive to SDHi exposure. Therefore, it would be wise to include them in biomonitoring programs. Finally, our work highlights the need to improve regulatory assessment procedures to take better account of SDHi mode of action, by developing relevant tests to cover the multiple key events linked to SDH inactivation and assess the resulting mitochondrial toxicity.

Environment InternationalVol. 199
Centre National de la Recherche Scientifique (FR), Université Toulouse III - Paul Sabatier (FR), Inserm (FR), École des Hautes Études en Santé Publique (FR), École Nationale Vétérinaire de Toulouse (FR), Université Paris Cité (FR), Sorbonne Université (FR), Centre de Recherches en Cancérologie de Toulouse (FR), Sorbonne Paris Cité (FR), Centre de Recherche des Cordeliers (FR), La Ligue Contre le Cancer (FR), Toxicologie Alimentaire (FR), Institut de Recherche en Santé, Environnement et Travail (FR), Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (FR), Structure Fédérative de Recherche en Biologie et Santé de Rennes (FR), Université de Rennes (FR), The University of Texas Southwestern Medical Center (US)
Institut National de la Santé et de la Recherche Médicale
Zero hunger
Openalex Percentile: Top 13%
Colorectal Cancer Treatments and Studies
2.09
DOIOpen Access PDFOpenAlex
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