AGONISTS SELECTIVE FOR TACHYKININ-NK(1) AND TACHYKININ-NK(3) RECEPTORS EXCITE SUBPOPULATIONS OF NEURONS IN THE RAT MEDIAL HABENULA NUCLEUS INVITRO

被引:14
作者
NORRIS, SK
BODEN, PR
WOODRUFF, GN
机构
[1] Parke-Davis Neuroscience Research Centre, Addenbrookes Hospital Site, Cambridge, CB2 2QB, Hills Road
关键词
MEDIAL HABENULA; NEUROKININ; SUBSTANCE-P; TACHYKININ;
D O I
10.1016/0014-2999(93)90957-J
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
The purpose of the present study was to determine the tachykinin receptor types present on neurones of the rat medial habenula nucleus. Extracellular recordings were made from spontaneously active medial habenula neurones in tissue slices of rat brain. The tachykinin analogues [Sar9,Met(O2)11]substance P, [beta-Ala8]neurokinin A-(4-10) and senktide were chosen for their potency and selectivity at NK1, NK2 and NK3 receptors, respectively. No neurone was observed to respond to [beta-Ala8]neurokinin A-(4-10). Neurones did respond to [Sar9,Met(O2)11]substance P and to senktide with a rapid and concentration-dependent increase in firing rate. Of the neurones where recordings were made, responses were obtained to one, both or neither of the agonists. These data suggest that receptors similar to NK1 and NK3, but not NK2 receptors, are differentially expressed on subpopulations of neurones of this nucleus.
引用
收藏
页码:223 / 228
页数:6
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