Abstract：
:Binding studies have shown that [125I]NKA is a selective ligand of tachykinin septide-sensitive binding sites from membranes of the rat submaxillary gland. Indeed, this ligand bound with high affinity to a single population of sites. In addition, competition studies indicated that natural tachykinins and tachykinin-related compounds had a similar affinity for these sites than for those labeled with [3H]ALIE-124, a selective ligand of septide-sensitive binding sites. Moreover, selective tachykinin NK2, or NK3 agonists or antagonists exhibited weak or no affinity for [125I]NKA binding sites. As indicated by Ki values of several compounds, the pharmacological characteristics of the septide-sensitive binding sites (labeled with [125I]NKA) largely differ from those of classic NK1 binding sites, as determined on crude synaptosomes from the rat brain using [125I]Bolton-Hunter substance P (SP) as ligand. Indeed, several tachykinins including neurokinin A (NKA), neuropeptide K (NPK), neuropeptide gamma (NKgamma), and neurokinin B, as well as some SP and NKA analogues or C-terminal fragments such as septide, ALIE-124, SP(6-11), NKA(4-10), which have a weak affinity for classic tachykinin NK1 binding sites exhibited a high affinity for the septide-sensitive binding sites. In contrast, SP, classic selective NK1 agonists, and antagonists had a high affinity for both types of binding sites. The presence of a large population of tachykinin septide-sensitive binding sites in the rat submaxillary gland may thus explain why NPK and NPgamma induce salivary secretion and may potentiate the SP-evoked response in spite of the absence of tachykinin NK2 receptors in this tissue.
journal_name
Peptidesjournal_title
Peptidesauthors
Beaujouan JC,Saffroy M,Torrens Y,Sagan S,Glowinski Jdoi
10.1016/s0196-9781(99)00140-0subject
Has Abstractpub_date
1999-11-01 00:00:00pages
1347-52issue
11eissn
0196-9781issn
1873-5169pii
S0196-9781(99)00140-0journal_volume
20pub_type
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