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. 1993 Jan;108(1):146–149. doi: 10.1111/j.1476-5381.1993.tb13454.x

Neurokinin-induced changes in pial artery diameter in the anaesthetized guinea-pig.

D T Beattie 1, C M Stubbs 1, H E Connor 1, W Feniuk 1
PMCID: PMC1907708  PMID: 7679026

Abstract

1. The effects of selective neurokinin agents on pial artery diameter, measured with an on-line image analyser, have been studied in anaesthetized guinea-pigs in order to characterize the neurokinin receptors present on pial arteries. 2. Perivascular injection of either substance P (0.01-1 microM) or the selective NK1 receptor agonists, substance P methyl ester (SPOMe, 0.01-1 microM) and GR73632 (0.1 microM), increased pial artery diameter. 3. In contrast, the selective NK2 receptor agonist, GR64349 (1 microM), produced a small vasoconstriction while the NK3 receptor-selective agonist, senktide (1 microM) was inactive. 4. Co-administration of GR82334 (1 microM), a selective NK1 receptor antagonist, inhibited the vasodilatation produced by SPOMe (0.1 microM) but not that caused by calcitonin gene-related peptide (CGRP, 0.01 microM). 5. The results are consistent with an involvement of NK1 receptors in the neurokinin-induced increase in guinea-pig pial artery diameter.

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Selected References

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