? The risk of developing Type II diabetes is increased 16-fold by obesity and approximately 10-fold by aging. Dietary restriction (DR, long term, low calorie diets) has established efficacy in delaying aging and in reducing neoplastic disease in lab rodents. We have now identified 93 components of the sera metabolome that define a DR serotype - i.e., a metabolic serotype that reflects caloric intake. Multivariate pattern recognition analysis has identified profiles that distinguish ad libitum fed (AL) and DR rats (100% accuracy in training sets, mean >90% in test sets), and enabled construction of accurate models of intermediate intakes (1^=0.88) for individual rats. Initial sera proteome profiles also distinguish diet with 100% accuracy,. The robust, systemic effects of DR suggest that a subset of the metabolites in sera that distinguish diet will reflect, even across species, the physiological benefits of reduced caloric intake. We have established an interdisciplinary, multi-site team of investigators to test the two-part hypothesis that 1) serum metabolite profiles that reflect long-term caloric intake in rats will predict relative risk of human disease (specific test case: Type II diabetes), and; 2) the components of these profiles are limited to a small subset of discrete metabolic pathways. Work on the latter sets the stage for understanding metabolic pathways involved in protective effects of DR against diabetes. The three Aims are:
Aim 1. To complete characterization of metabolic serotypes based on both the proteome and the metabolome, and to adapt these profiles for human epidemiological studies. Both individual serum constituents (proteins and metabolites) and their cognate metabolic profiles will be validated for studies using human samples.
Aim 2. To determine the extent to which metabolic profiles that are reflective of or independent of lone-term caloric intake predict type II diabetes in nested case control studies (Hypothesis, part 1) '
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