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- W2070599986 abstract "By immunohistochemistry, CGRP-like immunoreactive (CGRP-LI) nerve fibres were found in the lamina propria along small vessels and in the lamina muscularis mucosae in the porcine ileum. Immunoreactive nerve cell bodies were found in the submucous and myenteric plexus. Upon HPLC-analysis of ileal extracts, CGRP-LI corresponded entirely to porcine CGRP plus smaller amounts of oxidised CGRP. Using isolated vascularly perfused segments of the ileum, we studied the release of CGRP-LI in response to electrical stimulation of the mixed extrinsic periarterial nerves and to infusion of different neuroblockers. In addition, the effect of infusion of capsaicin was studied. The basal output of CGRP-LI was 2.9+/-0.7 pmol/5 min (mean+/-S.D.). Electrical nerve stimulation (8 Hz) significantly increased the release of CGRP-LI to 167+/-16% (mean+/-S.E.M.) of the basal output (n=13). This response was unaffected by the addition of atropine (10(-6) M). Nerve stimulation during infusion of phentolamine (10(-5) M) with and without additional infusion of atropine resulted in a significant further increase in the release of CGRP-LI to 261+/-134% (n=5) and 240+/-80% (n=9), respectively. This response was abolished by infusion of hexamethonium (3x10(-5) M). Infusion of capsaicin (10(-5) M) caused a significant increase in the release of CGRP-LI to 485+/-82% of basal output (n=5). Our results suggest a dual origin of CGRP innervation of the porcine ileum (intrinsic and extrinsic). The intrinsic CGRP neurons receive excitatory input by parasympathetic, possibly vagal, preganglionic fibres, via release of acetylcholine acting on nicotinic receptors. The stimulatory effect of capsaicin suggests that CGRP is also released from extrinsic sensory neurons." @default.
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- W2070599986 date "2001-04-01" @default.
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- W2070599986 title "Localisation and neural control of the release of calcitonin gene-related peptide (CGRP) from the isolated perfused porcine ileum" @default.
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- W2070599986 doi "https://doi.org/10.1016/s0167-0115(00)00242-1" @default.
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