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People across Europe and the world are starting to realise how much we don’t know about the consequences of our seemingly constant exposure to chemical mixtures of all kinds. Research under the EuroMix project should help stakeholders close this gap over the years to come.

EuroMix has been aiming to establish novel testing and assessment strategies for chemical mixtures found in humans, as well as the relevant tests and models to go alongside them.

The task was gargantuan. As Prof. Jacob van Klaveren, coordinator of the project on behalf of the Netherlands National Institute for Public Health and the Environment, underlines: “Prior to EuroMix, there was hardly any mechanism considering combined exposure to multiple chemicals via multiple exposure routes. This is hardly addressed in the current safety evaluation of chemicals, which is causing significant economical, societal and scientific concern.”

Various human biomonitoring studies have already proved that people in Europe have a considerable number of man-made chemicals in their bodies, originating from multiple sources, including food and water intake and dermal contact. Most European regulations stipulate the need to consider the potential mixture effect in the future. Besides, animal testing is less and less in vogue, and new testing methods are required. For the EuroMix team, the question was simple: How do we translate this goodwill into effective action?

A new method for a pressing issue

“EuroMix considers many chemical classes for their effects on human health,” says Prof. Van Klaveren. The team delivered a test strategy to generate the missing toxicity data needed to conduct future risk assessments. They tested a large number of chemicals and ran several case studies addressing exposure assessment affecting three adverse outcomes: liver steatosis, skeletal malformation and the endocrine system. Finally, they developed a novel risk modelling approach aligned with future needs in Europe and elsewhere.

“Our method starts with in silico modelling, to group chemicals into cumulative assessment groups in the absence of detailed toxicity data, and to set test priorities. From thereon, we use in vitro assays on the three adverse outcomes to investigate the appropriateness of assumptions related to dose addition as well as derive the relative toxicity of each chemical in a mixture. Results from in vitro testing are then compared with data from animal studies,” Prof. Van Klaveren explains.

Although in vitro assays already allow for the generation of new hazard data on as yet untested chemicals, Prof. Van Klaveren indeed stresses how their results need to be extrapolated from internal exposure concentrations to external doses before being used in mixture risk assessment. For this, the EuroMix team developed nine specific and one generic in vitro to in vivo (IVIVE) models.

Beyond the project

By the end of the project, the consortium will provide an open, web-based data and model platform. This platform includes: the results of in silico modelling; the in vitro test results and a modelling approach to derive relative potency factors; the IVIVE modelling approach; and the in vivo data.

A total of 11 Member States have already performed a dietary mixture exposure assessment using EuroMix data and models. Three case studies addressing multiple exposure routes of bisphenols and pesticides, along with a feasibility study on simultaneous exposure to pesticides, additives and contaminants regulated under different regulatory sectors, will soon be published.

For better or worse, chemicals have become an integrant part of our lives. And while there is still much we don’t know about the consequences of this ubiquity on our health, EuroMix is certainly making headway.

Reference source: EuroMix

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