{"id":25174,"date":"2019-07-05T00:00:09","date_gmt":"2019-07-05T04:00:09","guid":{"rendered":"http:\/\/beyondpesticides.org\/dailynewsblog\/?p=25174"},"modified":"2019-07-04T21:11:08","modified_gmt":"2019-07-05T01:11:08","slug":"widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells","status":"publish","type":"post","link":"https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/","title":{"rendered":"Widely Used Fungicide Found to Adversely Affect Enzyme Common to All Cells"},"content":{"rendered":"

\"\"(Beyond Pesticides<\/em>, July 5, 2019) This is a story about a chemical pesticide, a fungicide, in wide use for which the mode of action, i.e., the ability to cause harm, has not been fully understood. It is not a story unique to this pesticide. Rather, it is an important story to consider when deciding to use a pesticide or allowing a pesticide to be used. The question is whether the chemical could be broadly problematic beyond the target organisms, in this case fungi?\u00a0In its coverage of a study published in March, the American Association for the Advancement of Science publication, EurekAlert, <\/em>reported<\/a> that, \u201cThe ability of [the fungicide] fludioxonil to act on a sugar-metabolizing enzyme common to all cells, and to produce the damaging compound methylglyoxal, may mean that the pesticide has more potential to harm non-fungal cells than previously thought. Although fludioxonil has been deemed safe for use, the authors . . . suggest that the effects of this widely used pesticide has upon animals be re-examined.\u201d<\/p>\n

The research study, published in March in Scientific Reports<\/em><\/a> and led by T. Tristan Brandhorst, PhD (in the lab of Dr. Bruce Klein at the University of Wisconsin\u2013Madison and UW School of Medicine and Public Health), sheds light on that mechanism and raises the alarm about implications of the discovery. Among the myriad pesticides used in agriculture is fludioxonil<\/a>, a phenylpyrrole fungicide, which was developed to treat seeds during storage. However, it has come to be used commonly on grains, vegetables, fruits, and ornamental plants during cultivation, and worse (more on this below), to treat produce after it has been harvested to extend \u201cshelf life.\u201d Though fludioxonil is effective in killing fungi, the mode, or mechanism, of action for this pesticide was previously not well understood.<\/p>\n

Fludioxonil was introduced in 1993\u20131994 by Ciba-Geigy (now Syngenta), and pesticides that include the compound are now marketed under various brand names, including Cannonball, Switch, Medallion, Helix, Celest, Apron, Agri Star\u00a0Fludioxonil, Dyna-shield\u00a0Fludioxonil, Maxim, Scholar, Spirato, and others. Syngenta promotes it for use on \u201ctargeted fungi, such as snow mold, seedborne and soilborne\u00a0Fusarium<\/em>, [and] seedling blights or bunts.\u201d Its use has increased in the 25 years since then, and particularly in the last few, ratcheting up concern about its features and impacts.<\/p>\n

In a previous investigation, Drs. Brandhorst and Klein pointed to the uncertainty<\/a> about how fludioxonil actually causes fungi cell death, asserting that this uncertainty merits a re-evaluation by the Environmental Protection Agency (EPA) of its potential impacts on human health, noting reports of the fungicide\u2019s ability to disrupt hepatic, endocrine, and neurological systems. Prior to this current study, it was believed that fludioxonil targets hybrid histidine kinase (HHK), a protein in fungal cells. Syngenta has theorized, re: the mechanism of action, that fludioxonil binds to HHK, activating a biochemical process that causes fungal cells to kill themselves. In 2016, Dr. Klein\u2019s lab team found that, although fludioxonil needs HHK in order to kill fungi, the pesticide and protein do not directly interact.<\/p>\n

The scientists in Dr. Klein\u2019s lab turned to the hypothesis that oxidative stress \u2014 a common effect of pesticides on their targets \u2014 might be the linchpin. (Oxidative stress is an imbalance, in cells, between the production of free radicals and reactive metabolites, and their elimination by antioxidants.) Yet, the team found that, when they exposed fungi to various kinds of oxidative stress, cells remained healthy. Finally, the researchers discovered that fludioxonil inhibits an enzyme related to cellular sugar metabolism, causing (via a spike in methylglyoxal release) activation of the deadly HHK cascade.<\/p>\n

Dr. Brandhorst notes<\/a>, \u201cThe take home lesson is that fludioxonil is multifactorial. It’s not compromising cells by one solitary mechanism. It has potential to damage cells in a variety of ways.\u201d He references a 2007 investigation<\/a> that demonstrated that in fungi, disruption of glutathione homeostasis (which manages oxidative stress) synergistically enhances the toxicity of fludioxonil, suggesting that an oxidative stress response pathway may overshadow osmoregulation functions (maintenance of constant osmotic pressure in the fluids of an organism by the control of water and salt concentrations). Glutathione is primarily an intracellular antioxidant, which protects cells against the effects of free radicals \u2014 which can include damage to DNA. Fludioxonil has been shown to have DNA damaging impacts on human liver cells<\/a>, and Dr. Brandhorst suspects that glutathione depletion (a signaling event that regulates the activation of\u00a0cell death pathways) may ultimately be identified as a factor in fludioxonil-related hepatic damage. The enzyme-suppressing action of fludioxonil on an enzyme<\/em> common to all cells<\/em> is at the heart of the alarm this research is raising, but it is not the only reason the fungicide needs to be re-evaluated.<\/p>\n

Fludioxonil persists in soil \u2014 near the surface for weeks, and for years if it ends up deeper in the soil, where sunlight cannot speed its degradation; it is also a \u201csuper toxin\u201d for earthworms<\/a>. The fungicide\u2019s extensive post-harvest use on food crops is of particular concern because it eliminates the chance for wind, rain, and ultraviolet-visible (UV-vis) light to break down the compound, and once applied, the waxy fungicide is not easily removed by rinsing<\/a>. Further, UV-vis treatment of produce<\/a> (which is sometimes done to reduce pathogens on fresh fruits and\u00a0vegetables) actually significantly increases the toxicity of fludioxonil.<\/p>\n

The fungicide also is an EPA Category I toxin \u2014 \u201chighly toxic and severely irritating\u201d \u2014 to aquatic plants, bacteria, insects, fish, and aquatic invertebrates, generating concern about its use near water bodies or shorelines. Beyond all that, the lead author indicates that \u201cthere is also reason to believe that breakdown products of this pesticide may be 100 times more toxic than fludioxonil itself.\u201d<\/p>\n

In addition, the issue of synergistic action among multiple pesticide compounds, or active and adjuvant ingredients in a pesticide, is woefully under-addressed by regulators. Synergistic action was explained simply and long ago by Beyond Pesticides in its journal Pesticides and You<\/em><\/a>: \u201cThe concept of interaction is fundamental to understanding the processes by which chemical mixtures act. If the effect is simply additive, the sum of the effects is the same as if we were exposed to each chemical individually. Synergy occurs when the effect of a mixture of chemicals is greater than the sum of the individual effects.\u201d<\/p>\n

The federal bodies in the U.S. that are supposed to ensure the safety of both chemicals used in the environment, and those used on food crops and products \u2014 EPA, and the Food and Drug Administration (FDA), respectively \u2014 fail to do so. Another passage from the Pesticides and You <\/em>article offers background<\/a>: \u201cIn 1996, EPA was required for the first time to consider cumulative pesticide exposures in limited circumstances under the Food Quality Protection Act (FQPA). [That Act], which amends the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA), recognizes that real-world pesticide exposures do not occur as single discrete exposures to a specific pesticide, but rather in combination [with] several pesticides at once. . . . To address the issue of multiple pesticide exposures, FQPA directs EPA to consider combinations of pesticides that have a common mechanism of toxicity when setting tolerances\u201d [\u201cacceptable\u201d levels of pesticide residue in agricultural products]. Because this mandate is a narrow one, confined to compounds that have a \u201ccommon mechanism of toxicity,\u201d many chemicals are never evaluated by EPA for their synergistic potential.<\/p>\n

Thus, EPA continues not to evaluate comprehensively for synergistic effects<\/a>, which can be more toxic than exposure to a single compound. In 2016, the Center for Biological Diversity wrote an extensive report on this issue<\/a>: Toxic Concoctions: How the EPA Ignores the Dangers of Pesticide Cocktails<\/em>. Adding to the concern about fludioxonil\u2019s mechanism of action and the implications for all kinds of organisms, including humans, is its synergistic potential. A 2012 study by French researchers found<\/a> that a mixture of fludioxonil and cyprodinil<\/a>, another fungicide, yielded data suggesting cytotoxic (lethal to cells) and genotoxic (damaging to DNA) effects at low concentrations, and with a significantly higher effect of the mixture than would be expected from an exposure response to the individual fungicides. This study<\/a> by Dr. Brandhorst, et al. adds to the growing body of research<\/a>\u00a0on the interactive effects of pesticides on human health and the environment.<\/p>\n

Beyond Pesticides advocates for a far-more Precautionary approach<\/a> to pest control in land management<\/a> and agriculture<\/a>, with a transition to organic methods as the ultimate goal<\/a>. It also monitors and reports on emerging research and developments related to pesticide use through its Daily News Blog<\/a> and its journal, Pesticides and You<\/a><\/em>.<\/p>\n

All unattributed positions and opinions in this piece are those of Beyond Pesticides<\/em>.<\/p>\n

Sources: https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC6433957\/<\/a> and personal communication with the study\u2019s lead author, T. Tristan Brandhorst [tbrandho@wisc.edu]<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

(Beyond Pesticides, July 5, 2019) This is a story about a chemical pesticide, a fungicide, in wide use for which the mode of action, i.e., the ability to cause harm, has not been fully understood. It is not a story unique to this pesticide. Rather, it is an important story to consider when deciding to use a pesticide or allowing a pesticide to be used. The question is whether the chemical could be broadly problematic beyond the target organisms, in this case fungi?\u00a0In its coverage of a study published in March, the American Association for the Advancement of Science publication, EurekAlert, reported that, \u201cThe ability of [the fungicide] fludioxonil to act on a sugar-metabolizing enzyme common to all cells, and to produce the damaging compound methylglyoxal, may mean that the pesticide has more potential to harm non-fungal cells than previously thought. Although fludioxonil has been deemed safe for use, the authors . . . suggest that the effects of this widely used pesticide has upon animals be re-examined.\u201d The research study, published in March in Scientific Reports and led by T. Tristan Brandhorst, PhD (in the lab of Dr. Bruce Klein at the University of Wisconsin\u2013Madison and UW School of […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[354,420,374,166,1],"tags":[],"class_list":["post-25174","post","type-post","status-publish","format-standard","hentry","category-environmental-protection-agency-epa","category-fludioxonil","category-fungicides","category-syngenta","category-uncategorized"],"yoast_head":"\nWidely Used Fungicide Found to Adversely Affect Enzyme Common to All Cells - Beyond Pesticides Daily News Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Widely Used Fungicide Found to Adversely Affect Enzyme Common to All Cells - Beyond Pesticides Daily News Blog\" \/>\n<meta property=\"og:description\" content=\"(Beyond Pesticides, July 5, 2019) This is a story about a chemical pesticide, a fungicide, in wide use for which the mode of action, i.e., the ability to cause harm, has not been fully understood. 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It is not a story unique to this pesticide. Rather, it is an important story to consider when deciding to use a pesticide or allowing a pesticide to be used. The question is whether the chemical could be broadly problematic beyond the target organisms, in this case fungi?\u00a0In its coverage of a study published in March, the American Association for the Advancement of Science publication, EurekAlert, reported that, \u201cThe ability of [the fungicide] fludioxonil to act on a sugar-metabolizing enzyme common to all cells, and to produce the damaging compound methylglyoxal, may mean that the pesticide has more potential to harm non-fungal cells than previously thought. Although fludioxonil has been deemed safe for use, the authors . . . suggest that the effects of this widely used pesticide has upon animals be re-examined.\u201d The research study, published in March in Scientific Reports and led by T. Tristan Brandhorst, PhD (in the lab of Dr. Bruce Klein at the University of Wisconsin\u2013Madison and UW School of […]","og_url":"https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/","og_site_name":"Beyond Pesticides Daily News Blog","article_publisher":"https:\/\/www.facebook.com\/beyondpesticides","article_author":"https:\/\/www.facebook.com\/beyondpesticides\/","article_published_time":"2019-07-05T04:00:09+00:00","og_image":[{"url":"https:\/\/beyondpesticides.org\/dailynewsblog\/wp-content\/uploads\/2018\/06\/download-3.jpg","type":"","width":"","height":""}],"author":"Beyond Pesticides","twitter_card":"summary_large_image","twitter_creator":"@ByondPesticides","twitter_site":"@ByondPesticides","twitter_misc":{"Written by":"Beyond Pesticides","Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/#article","isPartOf":{"@id":"https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/"},"author":{"name":"Beyond Pesticides","@id":"https:\/\/beyondpesticides.org\/dailynewsblog\/#\/schema\/person\/1b5c0a0981b549cc5b628770073031f4"},"headline":"Widely Used Fungicide Found to Adversely Affect Enzyme Common to All Cells","datePublished":"2019-07-05T04:00:09+00:00","mainEntityOfPage":{"@id":"https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/"},"wordCount":1456,"commentCount":0,"publisher":{"@id":"https:\/\/beyondpesticides.org\/dailynewsblog\/#organization"},"image":{"@id":"https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/#primaryimage"},"thumbnailUrl":"https:\/\/beyondpesticides.org\/dailynewsblog\/wp-content\/uploads\/2018\/06\/download-3.jpg","articleSection":["Environmental Protection Agency (EPA)","fludioxonil","Fungicides","Syngenta"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/","url":"https:\/\/beyondpesticides.org\/dailynewsblog\/2019\/07\/widely-used-fungicide-found-to-adversely-affect-enzyme-common-to-all-cells\/","name":"Widely Used Fungicide Found to Adversely Affect Enzyme Common to All Cells - 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By forging ties with governments, nonprofits, and people who rely on these natural resources, we reduce the need for unnecessary pesticide use and protect public health and the environment. Beyond Pesticides provides hands-on services to the public and supports local action by: identifying and interpreting hazards; and, designing safe pest management programs. With the information provided by Beyond Pesticides, people may not only be able to make informed choices and adopt practices that protect themselves and their families from unnecessary exposure to pesticides, but they will be able to effect changes on community-wide pest management decisions and policies that govern pesticide use, such as pesticide uses in parks, schools, for community insect control and along roadsides. 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