Abstract
We have studied the effects of a hyperglycemic temperature induced factor (TIF) on glucose metabolism, in 3 groups of Wistar rats: 10 rats injected with non-heated serum, 10 rats injected with heated serum and 10 rats injected with semi-purified TIF. Seric levels of insulin and glucagon were not modified in rats injected with heated serum. The injection of heated serum induced hyperglycemia (p < 0.0001), a decrease of lactate (p < 0.001) and pyruvate (p < 0.05) levels, and an increase of acetoacetate level (p < 0.001). The levels of beta hydroxybutyrate and amino acids (alanine and glutamine) were not changed. Glucose turn over rate (12.3 +/- 1.3 g/min/kg) and metabolic clearance of glucose (10.0 +/- 0.8 ml/min/kg) were significantly lower in rats treated with heated serum and purified TIF than in controls (respectively, p < 0.05 and p < 0.001). These data suggested that the hyperglycemic effect of heated serum and isolated TIF could correspond to an impaired metabolic clearance of glucose and to an increased gluconeogenesis.
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