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Modulation of vascular function by neuropeptide Y during development of hypertension in spontaneously hypertensive rats

  • Proceedings of the Fifth International Workshop on Developmental Renal Physiology (Part II) August 26–28, 1992 Tremezzo, Italy
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Abstract

Neuropeptide Y (NPY) is a sympathetic cotransmitter and a platelet-derived factor which causes vasoconstriction, potentiation of norepinephrine (NE) action, and vascular mitogenic effects. Reciprocally, NE markedly enhances the actions of NPY. We studied vasopressor effects of NPY and sources of peptide release during the development of hypertension in spontaneously hypertensive rats (SHR). Conscious SHR (4 and 16 weeks old) had higher resting plasma levels of NE and epinephrine than age-matched Wistar-Kyoto (WKY) rats, but similar NPY immunoreactivity (NPY-ir) levels in platelet-poor plasmas (PPP). In both strains, NPY-ir levels in PPP were higher in 4-week-old than in older rats. However, at all ages (4–24 weeks) SHR had markedly elevated NPY-ir content in platelet-rich-plasmas than WKY rats, although levels declined with age and hypertension. In the superior mesenteric artery. NPY-ir content (per mg) was significantly higher in 4-week-old but lower in 16-week-old SHR than in WKY rats, suggesting greater sympatho-neural NPY stores and release (leading to depletion) during the development of hypertension. Four-week-old SHR also tended to have higher NPY-ir content in the adrenal medullae and coeliac ganglia but a lower content in the kidney than WKY rats; these differences disappeared with age. Pressor responsiveness to α-agonists and NPY were similar in both strains at 4 weeks. While unchanged by age in WKY rats, adrenergic and NPY-mediated vasopressor responses became augmented in 16- to 24-week-old SHR (compared with WKY rats); this hyperresponsiveness was not completely abolished by ganglionic blockade and not observed with vasopressin. The development of adrenergic hyperresponsiveness in SHR in the face of higher circulating catecholamines suggests a defect in downregulation of α-adrenoceptors. Since we have previously found that NPY can reverse pressor desensitization to NE, we postulate that increased release of platelet and sympatho-neural NPY leads to impaired adrenergic desensitization, whereas adrenergic/NPY interactions tesult in sensitization to NPY in SHR, and thus may contribute to vascular hyperreactivity and hypertrophy.

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Authors and Affiliations

  1. Department of Physiology and Biophysics, Georgetown University Medical Center, 3800 Rsservoir Road, 20007, Washington, D. C., USA

    Zofia Zukowska-Grojec, Maria Golczynska, Gregory H. Shen, Armida Torres-Duarte & Adam K. Myers

  2. Department of Cardiology, University of Heidelberg, Heidelberg, Germany

    Markus Haass

  3. Division of Neurobiology, Department of Neurology, Cornell Medical College, New York, USA

    Claes Wahlestedt

Authors
  1. Zofia Zukowska-Grojec
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  2. Maria Golczynska
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  3. Gregory H. Shen
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  4. Armida Torres-Duarte
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  5. Markus Haass
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  6. Claes Wahlestedt
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  7. Adam K. Myers
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Zukowska-Grojec, Z., Golczynska, M., Shen, G.H. et al. Modulation of vascular function by neuropeptide Y during development of hypertension in spontaneously hypertensive rats. Pediatr Nephrol 7, 845–852 (1993). https://doi.org/10.1007/BF01213372

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  • DOI: https://doi.org/10.1007/BF01213372

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