Comparison of [125I]Iodolysergic Acid Diethylamide Binding in Human Frontal Cortex and Platelet Tissue

Comparison of [125I]Iodolysergic Acid Diethylamide Binding in Human Frontal Cortex and Platelet Tissue
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[125I]碘麦角酸二乙酰胺在人额叶皮质和血小板组织中结合的比较

DOI:
10.1111/j.1471-4159.1989.tb07313.x
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发表时间:
1989
影响因子:
4.7
通讯作者:
Amanda Kent
Amanda Kent
中科院分区:
医学2区
文献类型:
--
作者:
J. Elliott;Amanda Kent

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翻译后摘要:人血小板含有一个功能性5-羟色胺(5-HT)受体,似乎类似于5-HT 2亚型。在本研究中,我们使用碘化衍生物[I25 I]iodolysergic acid diethylamide([I25 I]iodoLSD)在相同的测定条件下尝试标记人血小板和额叶皮质膜中的5-HT受体,以比较这两种组织中标记的位点。在人类额叶皮质中,[125 I]iodoLSD标记了单个高亲和力位点(KD= 0.35 ± 0.02 nM)。特异性[125 I]iodoLSD结合的置换表明了典型的5-HT 2受体抑制特征,其与使用[3 H]酮色林观察到的结果具有显著的线性相关性(r= 0.97,p > 0.001,n = 17)。然而,[125 I]iodoLSD(Bmax= 136 ± 7 fmol/mg蛋白质)标记的位点显著少于[3 H]酮色林(Bmax= 258 ± 19 fmol/mg蛋白质)(p > 0.001,n = 6)。在人血小板膜中,[125 I]iodoLSD标记的单个位点的亲和力(KD= 0.37 ± 0.03 nM)与额叶皮质相似。血小板抑制率与额叶抑制率呈显著正相关(r = 0.9999)。0.96,p > 0.001,n = 16)。我们的结论是,人体血小板膜中[125 I]iodoLSD标记的位点在生物化学上与额叶皮质中的位点相似,并且最接近5-HT 2受体亚型,尽管[125 I]iodoLSD和[3 H]酮色林结合能力的差异引起了关于该受体的绝对性质的问题。
Abstract: The human platelet contains a functional 5‐hy‐droxytryptamine (5‐HT) receptor that appears to resemble the 5‐HT2 subtype. In this study, we have used the iodinated derivative [I25I]iodolysergic acid diethylamide ([I25I]iodoLSD) in an attempt to label 5‐HT receptors in human platelet and frontal cortex membranes under identical assay conditions to compare the sites labelled in these two tissues. In human frontal cortex, [125I]iodoLSD labelled a single high‐affinity site (KD= 0.35 ± 0.02 nM). Displacement of specific [l25I]iodoLSD binding indicated a typical 5‐HT2 receptor inhibition profile, which demonstrated a significant linear correlation (r= 0.97, p > 0.001, n = 17) with that observed using [3H]ketanserin. However, [125I]iodoLSD (Bmax= 136 ± 7 fmol/mg of protein) labelled significantly fewer sites than [3H]ketanserin (Bmax= 258 ± 19 fmol/mg of protein) (p > 0.001, n = 6). In human platelet membranes, [125I]iodoLSD labelled a single site with affinity (KD= 0.37 ± 0.03 nM) similar to that in frontal cortex. The inhibition profile in the platelet showed significant correlation with that in frontal cortex (r.= 0.96, p > 0.001, n = 16). We conclude that the site labelled by [125I]iodoLSD in human platelet membranes is biochemically similar to that in frontal cortex and most closely resembles the 5‐HT2 receptor subtype, although the discrepancy in binding capacities of [125I]iodoLSD and [3H]ketanserin raises a question about the absolute nature of this receptor.
自杀受害者额叶皮质中血清素2和β-肾上腺素受体的结合增加。
DOI: 10.1001/archpsyc.1986.01800100048007
发表时间: 1986
影响因子: --
作者:
Mann,JJ;Stanley,M;McBride,PA;McEwen,BS
通讯作者: McEwen,BS
DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
影响因子: --
作者:
Moretti-Rojas,I;Ezrailson,EG;Birnbaumer,L;Entman,ML;Garber,AJ
通讯作者: Garber,AJ
[3H]DOB:5-HT2 血清素受体的特异性激动剂放射性配体。
DOI: 10.1016/0014-2999(85)90486-8
发表时间: 1985
影响因子: 5
作者:
Titeler,M;Herrick,K;Lyon,RA;McKenney,JD;Glennon,RA
通讯作者: Glennon,RA
人血小板上血清素结合位点的表征。
DOI: 10.1016/0024-3205(83)90743-9
发表时间: 1983
期刊: Life sciences
影响因子: 6.1
作者:
McBride,PA;Mann,JJ;McEwen,B;Biegon,A
通讯作者: Biegon,A
评估 5-HT2 受体对人血小板的结合指数和生理反应性。
DOI: 10.1016/0024-3205(87)90091-9
发表时间: 1987
期刊: Life sciences
影响因子: 6.1
作者:
McBride,PA;Mann,JJ;Polley,MJ;Wiley,AJ;Sweeney,JA
通讯作者: Sweeney,JA