Showing papers by "Céline Brochot published in 2018"

Human Early Life Exposome (HELIX) study: A European population-based exposome cohort

Abstract: Purpose Essential to exposome research is the collection of data on many environmental exposures from different domains in the same subjects. The aim of the Human Early Life Exposome (HELIX) study was to measure and describe multiple environmental exposures during early life (pregnancy and childhood) in a prospective cohort and associate these exposures with molecular omics signatures and child health outcomes. Here, we describe recruitment, measurements available and baseline data of the HELIX study populations. Participants The HELIX study represents a collaborative project across six established and ongoing longitudinal population-based birth cohort studies in six European countries (France, Greece, Lithuania, Norway, Spain and the UK). HELIX used a multilevel study design with the entire study population totalling 31 472 mother-child pairs, recruited during pregnancy, in the six existing cohorts (first level); a subcohort of 1301 mother-child pairs where biomarkers, omics signatures and child health outcomes were measured at age 6-11 years (second level) and repeat-sampling panel studies with around 150 children and 150 pregnant women aimed at collecting personal exposure data (third level). Findings to date Cohort data include urban environment, hazardous substances and lifestyle-related exposures for women during pregnancy and their offspring from birth until 6-11 years. Common, standardised protocols were used to collect biological samples, measure exposure biomarkers and omics signatures and assess child health across the six cohorts. Baseline data of the cohort show substantial variation in health outcomes and determinants between the six countries, for example, in family affluence levels, tobacco smoking, physical activity, dietary habits and prevalence of childhood obesity, asthma, allergies and attention deficit hyperactivity disorder. Future plans HELIX study results will inform on the early life exposome and its association with molecular omics signatures and child health outcomes. Cohort data are accessible for future research involving researchers external to the project.

Modelling the Fate of Chemicals in Humans Using a Lifetime Physiologically Based Pharmacokinetic (PBPK) Model in MERLIN-Expo

Abstract: This chapter presents the human model implemented in MERLIN-Expo. This model is a physiologically based pharmacokinetic (PBPK) model that describes the relationship between an external dose and an internal dosimetry using parameters related to the anatomy and physiology of individuals and the physico-chemical properties of the contaminants. The goal of the PBPK model is to simulate the toxicokinetics of contaminants in humans, e.g. the amounts or concentrations of contaminants in different organs/tissues, under various exposure conditions. The generic PBPK model is based on a detailed compartmentalisation of the human body and parameterised with relationships describing the time evolution of the physiology and anatomy of the individuals. In this chapter, we present the detailed description of the human model and the conditions to apply it in MERLIN-Expo. Finally, the model predictability is evaluated by a direct comparison between computational predictions and experimental data on small case studies.