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Tissue and serum somatostatin-like immunoreactivity in lean and obese Zucker rats.

Tissue and serum somatostatin levels were measured in genetically lean and obese Zucker rats. Immunoreactive somatostatin content was decreased in three central nervous system regions (hypothalamus, septum and preoptic area and thalamus) of obese rats but was increased in cerebral cortex. No differences were observed in antral or colonic somatostatin content but obese animals had significantly elevated pancreatic levels. Portal vein somatostatin-like immunoreactivity in contrast was significantly lower in obese rats. The widespread alterations in tissue and serum somatostatin-like immunoreactivity suggest either a diffuse abnormality of somatostatin physiology or a response to a generalised feature of the obese hyperinsulinaemic state.