Abstract:
:In the rat parotid gland, substance P has been shown to induce a phosphatidylinositol bisphosphate breakdown resulting in an inositol trisphosphate production. These data suggested that substance P activated a phospholipase C and thus mediated its effects through the calcium-phospholipid pathway. To determine which neurokinin (NK) receptor was involved in the substance P response, we have used selective agonists of the different NK receptors and examined their effects on both inositol trisphosphate production and calcium movements. A selective NK-1 receptor agonist, [Sar9Met(O2)11]-substance P, evoked an [3H]inositol trisphosphate production and a rapid and transient 45Ca2+ efflux. On the other hand, selective NK-2 and NK-3 receptor agonists, [beta-Ala8]-NKA(4-10) and [MePhe7]-NKB, respectively, were without effect. We conclude that, in the rat parotid glands, only the NK-1 receptors are coupled to the calcium-phospholipid pathway. The C-terminal part of substance P appeared to be sufficient to stimulate this route because the C-terminal octapeptide, substance P(4-11), mimicked substance P effects on both inositol trisphosphate production and calcium movements. The NK-2 and NK-3 receptors, if present in the rat parotid glands, are not associated with the calcium-phospholipid pathway.
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Guillemain I,Rollandy I,Imhoff V,Rossignol Bdoi
10.1111/j.1471-4159.1992.tb10980.xkeywords:
subject
Has Abstractpub_date
1992-06-01 00:00:00pages
2321-5issue
6eissn
0022-3042issn
1471-4159journal_volume
58pub_type
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