Research paper
Changes in sympathetic and endothelium-mediated responses in the rabbit central ear artery after acrylamide treatment

https://doi.org/10.1016/0165-1838(91)90130-UGet rights and content

Abstract

The effect of acrylamide intoxication on the innervation and local control of the rabbit central ear artery was investigated. There was no difference in the noradrenaline, neuropeptide Y and calcitonin gene-related peptide tissue content between control and experimental animals. There was, however, a slight reduction in catecholamine histofluorescence. Although the contractile efficiency of the rabbit central ear artery as measured by responses to potassium chloride was unchanged, nerve-mediated contractile responses were significantly attenuated in acrylamide-treated animals. Contractile responses induced by exogenous α,β-methylene ATP were markedly increased after acrylamide treatment, in contrast to contractions induced by exogenous noradrenaline which were attenuated at maximal concentrations. Modulatory effects of nerve-mediated contractile responses by neuropeptide Y were unaffected by acrylamide intoxication. It therefore appears that acrylamide intoxication damages sympathetic cotransmission, perhaps with preferential action on the purinergic component. Endothelium-dependent relaxant responses to acetylcholine and substance P were attenuated in acrylamide-treated animals, whereas relaxant responses mediated by calcitonin gene-related peptide (endothelium independent) were unaffected. The question of whether the damage to the endothelial cell action is a primary effect, or a secondary consequence of sympathetic nerve damage, is discussed.

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Cited by (5)

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    Citation Excerpt :

    Additionally, acrylamide exposure increased the sensitivity to phenylephrine and potassium, and significantly reduced the luminal areas of both male and female rat aortas (Toker et al., 2013). However, it was reported that nerve-mediated contractile responses were significantly attenuated in acrylamide-treated rabbit central ear artery (Maynard et al., 1991), which may result from the damage of sympathetic transmission in vivo. Therefore, these results suggest that acrylamide treatment may affect the angiogenesis, senescence and contractibility of blood vessels and nerve transmission innervating blood vessels.

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