Vasoactive intestinal peptide fluctuates in human blood with a circadian rhythm

Cugini, P; Lucia, P; Palma, L. Di; Re, Massimo; Leone, Giuseppe; Battisti, Paola; Canová, R; Gasbarrone, Laura; Cianetti, A.

doi:10.1016/0167-0115(91)90173-e

Cited by 11 publications

(7 citation statements)

References 31 publications

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“…The relation between VIP and changes in circadian fluctuations is less clear. Circadian changes were found in plasma VIP levels both in elderly males (74-85 years) and in subjects that were ten years younger (65-75 years) (Cugini et al, 1991;Rolandi et al, 1990). However, these blood levels of VIP probably do not come from SCN neurons.…”

Section: Degeneration In Hypothalamic Nucleimentioning

confidence: 95%

Activation and degeneration during aging: A morphometric study of the human hypothalamus

Zhou

Swaab

1999

Microsc. Res. Tech.

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Section: Degeneration In Hypothalamic Nucleimentioning

confidence: 95%

Activation and degeneration during aging: A morphometric study of the human hypothalamus

Zhou

Swaab

1999

Microsc. Res. Tech.

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“…As for VIP, the main VIP-IS was considered to be composed of VIP (1-28). A peak in the region of 24-25% MeCN was considered to be complexly composed of VIP (O) and minor fragments of VIP such as VIP (14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28). Thus, almost all of the peaks in the plasma extracts were considered to be SP-or VIPderived.…”

Section: Discussionmentioning

confidence: 99%

Decreases in Substance P and Vasoactive Intestinal Peptide Concentrations in Plasma of Stroke-Prone Spontaneously Hypertensive Rats.

et al. 1993

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“…Plasma VIP concentration was within the normal range in patients with liver transplants.32 The decrease in circulating VIP in elderly people was ascribed to the age-related involution of VIPergic neurons. 27 The finding that VIPergic fibres are less dense in transplanted hearts suggests that the low concentrations of VIP in patients with heart transplants could be caused partly by the lack of a cardiac source in such patients. But VIP is also synthesised and secreted by lymphocytes34-36 so that the pharmacological suppression of the immune system in transplant patients could account for their low plasma VIP concentrations.…”

Section: Discussionmentioning

confidence: 99%

Lack of circadian rhythm of plasma concentrations of vasoactive intestinal peptide in patients with orthotopic heart transplants.

Cugini

Lucia²,

Scibilia³

et al. 1993

Heart

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Objective-To study the circadian pattern of plasma concentrations of vasoactive intestinal peptide (VIP) in patients with orthotopic heart transplants. Circulating VIP is known to have neural and immunological sources. Patients and methods-13 patients with orthotopic heart transplants were studied 12-53 months (mean 318 months) after operation. All were haemodynamically compensated and had no histological evidence of rejection. They were being treated with cyclosporin, azathioprine, and prednisone. Ten healthy individuals were studied as controls. Circulating VIP was assayed six times within a 24h period. Time qualified data were analysed by ANOVA and the cosinor method. Student's t test for unpaired data and Bingham's test for cosinorderived parameters were used for statistical comparisons. Results-Plasma concentrations of VIP were lower in the patients with orthotopic heart transplants than in the controls (p < 0.001). ANOVA and the cosinor method respectively showed a statistically significant within-day variability and circadian rhythm in the controls but not in the patients with heart transplants.Discussion-The low plasma concentrations of VIP in the patients with heart transplants could be the result of the lack of contribution by the cardiac VlPergic fibres, a reduction of VIP release by the pharmacologically suppressed immune system, the inhibitory effects of cyclosporin on neural fimction and humoral secretions, and the effects of negative feedback on VIP release of high concentrations of atrial natriuretic peptide. The lack of the circadian rhythm suggests a structural disorder, which should be firther investigated. (Br HeartrJ 1993;70:363-365) Vasoactive intestinal peptide (VIP) is widely distributed throughout the central and peripheral nervous system where it acts as a neurotransmitter or neuromodulator or both.1-11 The cardiovascular system of various mammalian species is innervated by VIP fibres, which are more dense in the sinoatrial node, atrioventricular node, atrial myocardium, and epicardial coronary arteries and less dense in the ventricular myo-cardium.12-"5 The physiological role of endo-genous VIP in the cardiovascular system has not been clearly established. In adult animals and humans intravenous VIP causes vasodilatation of the systemic and coronary arteries and has positive inotropic and chronotropic effects.l6-22VIP is assumed to be a neurotransmitter rather than a bloodborne hormone and its circulating concentrations probably represent an overflow of the neuronal release. Plasma concentrations of VIP were increased in severe hepatic failure23 and cardiac failure2425 but unchanged in patients with circulatory shock24 or myocardial infarction.24Patients with heart transplants show abnormal circulating concentrations or circadian rhythmicity or both of the hormones responsible for the regulation of the cardiovascular system.26In the present study we investigated the hypothesis that, like other vasoactive peptides, VIP release is also impaired. We used a chronobiological prot...

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Vasoactive intestinal peptide fluctuates in human blood with a circadian rhythm

Cited by 11 publications

References 31 publications

Activation and degeneration during aging: A morphometric study of the human hypothalamus

Activation and degeneration during aging: A morphometric study of the human hypothalamus

Decreases in Substance P and Vasoactive Intestinal Peptide Concentrations in Plasma of Stroke-Prone Spontaneously Hypertensive Rats.

Lack of circadian rhythm of plasma concentrations of vasoactive intestinal peptide in patients with orthotopic heart transplants.

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