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Related Experiment Videos

Neuropeptide variability in man.

G N Onuoha1, A M Nugent, S J Hunter

  • 1Department of Medicine; Department of Cardiology, Royal Victoria Hospital, Belfast, UK.

European Journal of Clinical Investigation
|July 25, 2000
PubMed
Summary
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Circulating levels of vasoactive intestinal polypeptide (VIP), neuropeptide Y (NPY), and endothelin-1 (ET-1) show significant short-term variability in both healthy individuals and those with chronic cardiac failure. These neuropeptide fluctuations occur approximately every 10 minutes, suggesting pulsatile secretion patterns.

Area of Science:

  • Endocrinology
  • Cardiovascular Physiology
  • Neuroendocrinology

Background:

  • Previous research confirmed short-term variability in circulating cardiac peptides like ANP and BNP.
  • This study aimed to determine if similar variability exists for other vasoactive peptides.

Purpose of the Study:

  • To investigate short-term variability in plasma levels of vasoactive intestinal polypeptide (VIP), neuropeptide Y (NPY), endothelin-1 (ET-1), and calcitonin gene-related peptide (CGRP).
  • To compare these patterns between patients with chronic cardiac failure (CCF) and healthy controls.
  • To examine peptide levels across different vascular beds in individuals with normal cardiac function.

Main Methods:

  • Peripheral venous blood samples were collected at 2-minute intervals over 20 minutes from CCF patients and controls.

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  • In a separate cohort, blood was sampled from the pulmonary artery, femoral artery, and antecubital vein at 2-minute intervals in individuals with normal cardiac function.
  • Immunoreactivity of VIP, NPY, ET-1, and CGRP was measured in all samples.

    • Main Results:

    • VIP, NPY, and ET-1 exhibited significant peaks and troughs approximately every 10 minutes in both patient and control groups.
    • Calcitonin gene-related peptide (CGRP) levels showed minimal variation.
    • Circulating VIP and NPY levels were higher in CCF patients compared to controls, while ET-1 and CGRP levels were similar between groups.

    Conclusions:

    • Circulating levels of VIP, NPY, and ET-1 demonstrate marked, pulsatile variability, occurring every 10-15 minutes across different vascular beds.
    • Single measurements of these vasoactive peptides may require cautious interpretation due to their dynamic secretion patterns.
    • The findings prompt further investigation into the physiological mechanisms of hormone secretion in humans.