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Somatostatin-like activity, as determined by radioimmunoassay and bioassay, is present in HCl extracts of rat retina. The concentrations of immunoreactive somatostatin are 612 +/- 43 (mean +/- SEM)pg per whole retina of 0.621 +/- 0.044 pg/microgram of protein in retinas from rats killed by decapitation, values which are not significantly different from those in retinas from rats killed by ether inhalation. The immunoreactive somatostatin was partially purified and concentrated by immunoaffinity chromatography. Both the crude retinal extracts and the immunoaffinity-purified immunoreactive somatostatin inhibited, in a dose-related manner, the release of rat growth hormone from dispersed rat anterior pituitary cells in culture. When the immunoaffinity-purified immunoreactive somotostatin was subjected to gel filtration chromatography, 96% of the recovered somatostatin eluted as a peak corresponding in position to that of synthetic somatostatin. Retinas from a group of rats with hereditary degeneration of the photoreceptor cells and another group of rats studied 1 year after transection of the optic nerves demonstrated an increased concentration of immunoreactive somatostatin compared to controls.

Immunoreactive and biologically active somatostatin-like material in rat retina.