Cutting-edge molecular profiling analyses reveal that the popular weedkiller Roundup causes liver damage at doses permitted by regulators. Report: Claire Robinson
The new study
Mesnage R, Renney G, Séralini GE, Ward M, Antoniou MN. Multiomics reveal non-alcoholic fatty liver disease in rats following chronic exposure to an ultra-low dose of Roundup herbicide. Scientific Reports, 2016; 6:39328. http://www.nature.com/articles/srep39328
This article highlights the process and results of this study.
The weedkiller Roundup causes non-alcoholic fatty liver disease at very low doses permitted by regulators worldwide, a new peer-reviewed study shows. The study is the first ever to show a causative link between consumption of Roundup at a real-world environmentally relevant dose and a serious disease.
The new peer-reviewed study, led by Dr Michael Antoniou at King’s College London, used cutting-edge profiling methods to describe the molecular composition of the livers of female rats fed an extremely low dose of Roundup weedkiller, which is based on the chemical glyphosate, over a 2-year period.
The dose of glyphosate from the Roundup administered was thousands of times below what is permitted by regulators worldwide.
The study revealed that these animals suffered from non-alcoholic fatty liver disease (NAFLD).
Dr Antoniou said: “The findings of our study are very worrying as they demonstrate for the first time a causative link between an environmentally relevant level of Roundup consumption over the long-term and a serious disease – namely non-alcoholic fatty liver disease.
“Our results also suggest that regulators should reconsider the safety evaluation of glyphosate-based herbicides.”
Potentially serious implications for human health
The new results demonstrate that long-term consumption of an ultra-low dose of Roundup at a glyphosate daily intake level of only 4 nanograms per kilogram of bodyweight per day, which is 75,000 times below EU and 437,500 below US permitted levels, results in NAFLD.
Regulators worldwide accept toxicity studies in rats as indicators of human health risks. So the results of this latest study have serious implications for human health.
NAFLD currently affects 25% of the US population and similar numbers of Europeans. Risk factors include being overweight or obese, having diabetes, or having high cholesterol or high triglycerides (a constituent of body fat) in the blood. However, some people develop NAFLD even if they do not have any of these known risk factors. The new study raises the question of whether exposure to Roundup is a hitherto unrecognized risk factor.
Symptoms of NAFLD include fatigue, weakness, weight loss, loss of appetite, nausea, abdominal pain, spider-like blood vessels, yellowing of the skin and eyes (jaundice), itching, fluid build-up and swelling of the legs and abdomen, and mental confusion.
Definitive confirmation of liver dysfunction from low dose of Roundup
In the new study the researchers undertook a followup protein composition profile (“proteomics”) and small molecule metabolite biochemical profile (“metabolomics”) investigation of the same liver samples to confirm the prediction of disease suggested by the transcriptomics gene expression profile analysis. As the proteomics and metabolomics directly measure the actual composition of the organ, these analytical methods provide a definitive assessment of its health or disease status.
Overall, metabolomics and proteomics disturbances showed a substantial overlap with biochemical hallmarks of NAFLD and its progression to steatohepatosis (serious fatty liver disease). Therefore they definitively confirm that serious liver disease has resulted from chronic ultra-low dose Roundup exposure.
The findings in detail
Proteins significantly disturbed (214 out of 1906 detected), as shown by the proteomics profiling, reflected a type of cell damage from reactive oxygen (peroxisomal proliferation), steatosis (serious fatty liver disease) and necrosis (areas of dead tissue).
The metabolomics analysis (55 metabolites altered out of 673 detected) confirmed lipotoxic (excess fatty tissue) conditions and oxidative stress. Metabolite alterations were also associated with hallmarks of serious liver toxicity.