Somatostatin-like immunoreactivity in pituitary intraglandular colloid of intermediate lobe origin.

The objective of this study was to determine the presence of somatostatin-like immunoreactivity (SSIR) in bovine pituitary intraglandular colloid (IGC) of intermediate lobe (IL) origin. Three colloid samples, sufficient to perform the assays, were taken from freshly slaughtered steers, freed of extraneous tissue and lyophilized. The pools were extracted with acetone and petroleum either and the extract radioimmunoassayed for the presence of SSIR. SSIR was present in two of the three samples assayed. We conclude SS is one of the many peptides found in pituitary IGC of IL origin.