Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Hauser, G.J. et al.

Circulating neuropeptide Y in humans: relation to changes in catecholamine levels and changes in hemodynamics.

Neuropeptide-Y ( NPY) is a sympathetic cotransmitter, which causes vasoconstriction, decreases coronary blood flow and decreases cardiac output. Circulating immunoreactive NPY (ir- NPY) levels increase with exercise, in patients admitted to the coronary care unit, and during thoracic surgery, and may play a role in postoperative hemodynamics. We studied changes in ir- NPY, epinephrine ( E) and norepinephrine (NE) arterial plasma levels, and their correlation to simultaneous hemodynamic measurements at 8 perioperative time points in 13 patients undergoing open heart surgery. Changes in circulating ir- NPY negatively correlated with changes in systemic vascular resistance index (SVRI), mean arterial pressure (MAP) and mean pulmonary arterial pressure (MPAP) (P < 0.05), suggesting that the hemodynamic changes were the cause of the changes in ir- NPY levels, inducing overflow of NPY into the circulation via sympathetic activation. Changes in NE and E levels positively correlated with changes in heart rate (HR), SVRI and MPAP. Changes in E levels also positively correlated with changes in stroke volume index (SVI), central venous pressure (CVP) and cardiac index (CI). NE levels correlated well with E levels, but catecholamine levels did not correlate with ir- NPY levels. These results suggest, that the elevation in circulating NPY levels previously noted in patients with heart failure and acute myocardial infarction may reflect changes in NPY overflow and/or clearance secondary to increased sympathetic activity and to hemodynamic changes.[1]

References

Circulating neuropeptide Y in humans: relation to changes in catecholamine levels and changes in hemodynamics. Hauser, G.J., Danchak, M.R., Colvin, M.P., Hopkins, R.A., Wocial, B., Myers, A.K., Zukowska-Grojec, Z. Neuropeptides (1996) [Pubmed]

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