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Using two-dimensional electrophoresis on total extracts of adipose tissue from young lean (Fa/fa) and obese (fa/fa) Zucker rats, we have investigated the existence of early events at the protein level, before obvious obesity. Our results indicate that the two genotypes do not differ at 3 days of age in terms of polypeptide pattern. By 7 days of age, two polypeptides are transiently repressed in the fatty genotype, leading us to suggest their potential involvement in the onset of obesity. However, most of the differences between the lean and obese rats are detected at 30 days of age, characterized by an increase in the accumulation of several peptides in the adipose tissue of obese rats, in good agreement with the multiple biochemical changes previously identified at this stage of the disease. These results present evidence of new peptides that may be of interest in the study of the obesity syndrome.

biochemical journal

Differential polypeptide expression in adipose tissue of lean and obese Zucker rats. Evidence of specifically repressed peptides in 7-day-old pre-obese rats