Elsevier

Neuroscience

Volume 23, Issue 2, November 1987, Pages 693-703
Neuroscience

Co-localization of tachykinins and calcitonin gene-related peptide in capsaicin-sensitive afferents in relation to motility effects on the human ureter in vitro

https://doi.org/10.1016/0306-4522(87)90087-XGet rights and content

Abstract

Tachykinin- and calcitonin gene-related peptide (CGRP) immunoreactivities were localized by immunohistochemistry in the same nerves of the kidney, renal pelvis and ureter as well as in spinal ganglion cells of both the guinea-pig and man. The tachykinin and CGRP-immunoreactive nerves in the ureter were present within the smooth muscle layers, around blood vessels, close to and within the lining epithelium. The levels of neurokinin A-, substance P- and CGRP-like immunoreactivity per tissue weight, as determined by radioimmunoassay, were about 30–100-fold higher in the guinea-pig than in the human ureter, which was in good agreement with the relative density of immunoreactive nerve fibres, as seen by immunohistochemistry. Capsaicin treatment caused an almost total disappearance of both neurokinin A-, substance P- and CGRP-immunoreactive nerve fibres in the guinea-pig ureter and a 90% depletion of neurokinin A, substance P- and CGRP-like immunoreactivity, further supporting a sensory origin of these nerves. Reversed-phase high performance liquid chromatography of water extracts of the human ureter revealed the presence of neurokinin A- and eledoisin-like material using antiserum K12, which does not cross-react with substance P. Most of the CGRP-like immunoreactivity in human ureter extracts co-eluted with synthetic human CGRP. Capsaicin both caused inhibition of spontaneous motility of the human ureter in vitro and initiated contractions in some preparations. Neurokinin A and neuropeptide K potently initiated phasic contractions of the ureter, while substance P had only minor contractile effects. CGRP inhibited both spontaneous and neurokinin A-induced ureteric contractions.

In conclusion, peptides with potent opposite motility effects are present in the same, presumably sensory nerves of the ureter in both the guinea-pig and man. It will be of importance to determine whether local release of neuropeptides can account for ureteric motility changes accompanying sensory nerve activation upon ureteral obstruction, by e.g. renal calculi.

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