Annual Scientific Retreat: Predisposing Factors in the Development of Complex Diseases

Environmental Health Perspectives, April 2005 | Go to article overview

Annual Scientific Retreat: Predisposing Factors in the Development of Complex Diseases


The 2004 NIEHS Division of Extramural Research and Training's annual scientific retreat was titled "Predisposing Factors in the Development of Complex Diseases." The retreat focused on factors related to aging, immunology, infection, and genetics in the context of understanding risk modulators of environmentally induced diseases.

In the first session, participants discussed environmental influences on aging, including the contributions of environmental exposures to the development of chronic diseases, as well as new mouse models for aging and the validity of some of the more popular theories of aging in light of recent study results. The role of oxidative stress and accumulated oxidative damage as a factor in the development of chronic diseases was a common thread throughout these presentations.

The second session focused on innate immunity, inflammation, and the role of infection as predisposing factors in chronic disease. One presentation examined the role of bacterial load, asthma, and a hypothesized endotoxin switch that results in diametrically different effects in response to an antigen, depending on the dose and timing of exposure. Given that endotoxin potentiated the toxicity of several chemicals noted for their idiosyncratic reactions, these responses may have resulted from low-level, episodic, inflammatory events. Finally, data presented in the final talk of the session suggest that undernutrition in a host organism plays an important role in the rapid evolution of infectious agents including influenza viruses.

The final session focused on opportunities and challenges in using population-based studies to investigate gene-environment interactions leading to human disease, including the lack of repeatability of candidate gene association studies. A "unified" approach that assembles overlapping and synergistic networks of pathways for analyses was recommended in place of single candidate gene studies. …

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