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Professor Charles Vyvyan Howard, Dr George McKerr, Dr Kurt Saetzler and Professor Ana Soto, University of Ulster

A 3-D tissue model of breast morphogenesis for replacing animals in testing for endocrine disrupting substances

Abstract

Endocrine disrupting substances (EDS) are environmental chemicals that interfere with normal hormonal (endocrine) function. Some of the most striking disruption by EDS has been observed after mammalian fetal exposure. At present the most reliable way to test for the developmental effects of EDS is to use rodents (usually mice) culled at various stages of embryonic development. Each experiment typically uses 80 pregnant female mice or rats, producing 800 pups.

Fetal mammary growth has been shown to be particularly susceptible to EDS and this may cause problems such as mammary cancers in later life. For instance, the presence of artificial oestrogens can alter ductal growth, lumen formation, and collagen and fat deposition in developing mammary tissue. The aim of this project is to develop a three dimensional (3D) model of breast tissue, using human cells, to test EDS and therefore replace the use of animals for this purpose. This will build on results from a previous 2D model for testing the oestrogenic effects of chemicals which has already replaced around 1000 mice per year in the Soto laboratory and an estimated 10,000 per year in other laboratories worldwide. The 3D model is an improvement of the 2D model because it will consist of the various different cells, and exhibit the same complex branching structure, found in the breast. This will allow quantification of the pathological damage by the EDS, thus potentially replacing the use of rodents.