Evidence for selective release of somatostatin-14 and somatostatin-28(1- 12) from rat hypothalamus

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Abstract
Cysteamine administration to rats results in a marked depletion of hypothalamic somatostatin-14 (SS14) and a decrease of the potassium- evoked in vitro release of SS14 without a significant change in the content or release of somatostatin-28(1–12)-like immunoreactivity (SS28(1–12)-L1). Furthermore, cysteamine enhances the spontaneous release and markedly potentiates the potassium-evoked release of SS14 in the in vitro slice preparation. However, in vitro-administered cysteamine does not alter the spontaneous or potassium-evoked release of SS28(1–12)-LI. Immunohistochemical visualization of hypothalamic neuronal cell bodies and fibers following cysteamine administration shows a disappearance of the SS14 immunoreactive fibers and cell bodies with no apparent change in the SS28(1–12) immunoreactive fibers and cell bodies. These data suggest that, in rat hypothalamus, selective release of SS14 and SS28(1–12) can occur. The results are discussed in relation to possible sites of storage and release of the somatostatin- related peptides from synaptic nerve terminals.

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