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Neuropeptide (neuropeptide Y, neurotensin, vasoactive intestinal polypeptide, substance P, calcitonin gene-related peptide, somatostatin) immunohistochemistry and ultrastructure of renal nerves

Histochemistry, ISSN: 0301-5564, Vol: 89, Issue: 1, Page: 1-9
1988
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Article Description

With the use of several region-specific antisera and the peroxidase-antiperoxidase (PAP) technique, several regulatory polypeptides were localized in nerves of the kidney. Neuropeptide Y (NPY)- immunoreactivity (IR), neurotensin (NT)-IR and vasoactive intestinal polypeptide (VIP)-IR occurred at high densities in all segments of the renal arterial system forming a perivascular plexus. Furthermore, NT-IR nerves were particularly frequent at the juxtaglomerular apparatus (JGA). Calcitonin gene-related peptide (CGRP)-IR was mainly concentrated in nerves supplying the hilus arteries and the JGA. Substance P (SP)-IR was predominantly found in large varicosities close to large renal arterial vessels and in the vicinity of the JGA. Somatostatin (SOM)-IR was only observed in single varicosities located at the media-adventitia border of large renal hilus arteries. The peptidergic nerves are correlated to their ultrastructural counterpart. In addition, the distribution patterns and the frequency of the different types of renal peptidergic nerve fibres are evaluated and compared. The functional role of these neuropeptides and their origin within the efferent branch of this part of the peripheral autonomic nervous system is discussed. Furthermore, the implication of some of the neuropeptides studied in afferent renal innervation is also substantiated. © 1988 Springer-Verlag.

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