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  • Title: Acute stress stimulates secretion of GHRH and somatostatin into hypophysial portal blood of conscious sheep.
    Author: Cataldi M, Magnan E, Guillaume V, Dutour A, Sauze N, Mazzocchi L, Conte-Devolx B, Oliver C.
    Journal: Neurosci Lett; 1994 Aug 29; 178(1):103-6. PubMed ID: 7816315.
    Abstract:
    The effects of acute stress on growth hormone (GH) secretion and the mechanisms involved in its changes have been investigated in sheep. An acute isolation-restraint stress induced a rapid and significant increase in jugular GH levels in 12 out of 14 rams. GH-releasing hormone (GHRH) and somatostatin secretion during the same stress were studied in 5 animals prepared for hypophysial portal blood collection. A 3.5-fold increase in portal GHRH levels was observed concomitantly with a slight elevation in portal somatostatin. Portal corticotropin-releasing hormone (CRH) and jugular cortisol plasma levels increased during the same stress. Our data suggest that an isolation-restraint stress stimulates GH secretion in the sheep and that GHRH may be responsible for GH response.
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