title: A simple assay to quantify metallothionein helps to learn about bioindicators and environmental health.
abstract: We present a laboratory practice aimed to clarify and discuss the concept of bioindicator molecules in environmental health. It has been implemented as a hands-on laboratory exercise in postgraduate courses in public health (in Brazil) and in a course entitled Biology Applied to Natural Resources Sustainability (in Spain) but can be useful for undergraduate studies. By simple, repeatable, and low cost spectrophotometry methodology, students detect minimal concentrations (nmol) of metallothionein in biological samples obtained from sites with various status of pollution. They can also expose experimental fish or mollusks to heavy metals in aquarium conditions and then detect metallothionein. This method is excellent for didactic purposes because it can be developed even in modest laboratories with basic equipment for molecular biology.
authors.affiliation: Laboratório de Toxicologia, Centro de Estudos da Saúde do Trabalhador e Ecologia Humana, Escola Nacional de Saúde Pública Sérgio Arouca, Fundação Oswaldo Cruz, Rio de Janeiro, 21031-210 Brazil.
authors.forename: Ana R
authors.initials: AR
authors.lastname: Linde
authors.forename: Eva
authors.initials: E
authors.lastname: Garcia-Vazquez