当前位置： SCI文献检索 > LIFE SCIENCES期刊下所有文献 > Characterization of a [3H]-5-hydroxytryptamine binding site in rabbit caudate nucleus that differs from the 5-HT1A, 5-HT1B, 5-HT1C and 5-HT1D subtypes.

Characterization of a [3H]-5-hydroxytryptamine binding site in rabbit caudate nucleus that differs from the 5-HT1A, 5-HT1B, 5-HT1C and 5-HT1D subtypes.

Abstract：

:[3H]5-HT binding sites were analyzed in membranes prepared from the rabbit caudate nucleus (CN). [3H]5-HT labeled both 5-HT1A and 5-HT1C recognition sites, defined by nanomolar affinity for 8-OH-DPAT and mesulergine respectively; however, these represented only a fraction of total specific [3H]5-HT binding. Saturation experiments of [3H]5-HT binding in the presence of 100 nM 8-OH-DPAT and 100 nM mesulergine to block 5-HT1A and 5-HT1C sites revealed that non-5-HT1A/non-5-HT1C sites represented about 60% of the total 5-HT1 sites and that they exhibited saturable, high affinity, and homogeneous binding. The pharmacological profile of the non-5-HT1A/non-5-HT1C sites (designated 5-HT1R) also differed from that of 5-HT1B and 5-HT2 sites, but was similar to that of the 5-HT1D site. However, significant differences existed between the 5-HT1D and 5-HT1R sites for their Ki values for spiperone, spirilene (an analog of spiperone), metergoline, and methiothepin. The study of modulatory agents (calcium and GTP) also showed differences between the 5-HT1R and 5-HT1D sites. For example, the effects of GTP on agonist binding to the 5-HT1R sites were less than on the 5-HT1D sites in bovine caudate. In addition, calcium enhanced the effects of GTP on the 5-HT1R sites, whereas calcium inhibited the GTP effect on the 5-HT1D sites. The present findings demonstrate the presence of a high-affinity [3H]5-HT binding site in rabbit CN, designated 5-HT1R, that is different from previously defined 5-HT1A, 5-HT1B, 5-HT1C, 5-HT1D, and 5-HT2 sites.

journal_name

Life Sci

journal_title

Life sciences

authors

Xiong WC,Nelson DL

doi

10.1016/0024-3205(89)90033-7

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

1433-42

issue

16

eissn

0024-3205

issn

1879-0631

pii

0024-3205(89)90033-7

journal_volume

45

pub_type

杂志文章

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