Abstract

Somatostatin-28(1-12)-like immunoreactivity was measured in extracts of rat hypophysial portal blood and peripheral blood. The concentration of somatostatin-28(1-12) was higher in portal than in peripheral extracts, and its release into portal vessel blood was increased 4- to 5-fold by electrical stimulation of the median eminence. These results show that somatostatin-28(1-12) may be a physiological neurohormone and/or neurotransmitter.

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