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Alterations in levels of adrenal vein and circulating immunoreactive neuropeptide tyrosine Y (NPY), as well as systemic catecholamine concentrations, have been investigated in the dog after endotoxin administration. Eighteen dogs were anaesthetized with -chloralose and allowed to breathe spontaneously. Severe shock was produced by the administration of a large bolus of Escherichia coli endotoxin followed by a continuous infusion. In two further animals the left lumbar adrenal vein was cannulated and an intermittent choke allowed retrograde sampling of the adrenal effluent. The production of hypodynamic shock was associated with marked increases in systemic catecholamine concentrations but there were no consistent changes in adrenal vein or systemic immunoreactive NPY levels. In contrast, circulating concentrations of immunoreactive NPY were markedly raised above the normal range in five patients with septic shock.

J. Endocr. (1988) 116, 421–426