Novel ligands BQ123 and BQ3020 characterize endothelin receptor subtypes ETA and ETB in human kidney.

Novel ligands BQ123 and BQ3020 characterize endothelin receptor subtypes ETA and ETB in human kidney.
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新型配体 BQ123 和 BQ3020 表征了人肾中内皮素受体亚型 ETA 和 ETB。

DOI:
10.1038/ki.1993.210
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发表时间:
1993
影响因子:
19.6
通讯作者:
A. Davenport
A. Davenport
中科院分区:
医学1区
文献类型:
--
作者:
F. E. Karet;R. Kuc;A. Davenport

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内皮素(Endothelins,ET)是一组血管收缩多肽,在多种组织和物种中广泛表达,并与至少两种受体结合,其中至少有两种亚型:ETA和ETB。动物研究发现肾脏对ET的影响高度敏感。我们在结合研究中使用了两个对特定ET受体亚型具有选择性的新的多肽配体(ETA的拮抗剂BQ123和ETB的激动剂BQ3020)来表征人肾脏的ET受体。饱和实验得到[I125]ET-1的平衡解离常数为0.17+/-0.04 nM,[I125]BQ3020的平衡解离常数为0.36+/-0.06 nM。Hill系数分别为0.86+/-0.03和0.77+/-0.04。以BQ123和BQ3020为竞争阻滞剂的[I125]标记配体的宏观和显微放射自显影显示,大部分ET结合在延髓内,集中在血管直管束中,ETA结合定位于血管平滑肌。ETB亚型与ETA受体的优势比约为2:1,且分布更广泛,集中在收集系统。BQ3020的延髓和皮质的Bmax分别为18.7+/-2.2/11.3+/-2.7和12.7+/-3.9/7.6+/-3.5;BQ123的Bmax分别为36.2+/-5.6/11.1+/-4.1和14.9+/-1.6/5.3+/-0.2。这项研究证实了ETA和ETB受体在人肾脏中的分布,并证明了新的配体BQ123和BQ3020分别对ETA和ETB受体亚型具有至少1000倍的选择性。
Endothelins (ET), a group of vasoconstrictor peptides, are expressed in a wide range of tissues and species and bind to specific receptors of which there are at least two subtypes, ETA and ETB. The kidney has been found in animal studies to be highly sensitive to the effects of ET. We have used two new peptide ligands, which are selective for particular ET receptor subtypes (the antagonist BQ123 for ETA and the agonist BQ3020 for ETB) in binding studies to characterize human renal ET receptors. Saturation studies gave equilibrium dissociation constants (Kd) for [I125]ET-1 of 0.17 +/- 0.04 nM and for [I125]BQ3020 of 0.36 +/- 0.06 nM. Hill coefficients were 0.86 +/- 0.03 and 0.77 +/- 0.04, respectively. Macro- and microautoradiography using [I125]-labeled ligands with BQ123 and BQ3020 as competing blockers showed the majority of ET binding to be in the medulla with concentration in the vasa recta bundles, and ETA binding localizing to vascular smooth muscle. The ETB subtype predominated over ETA receptors by about 2:1, and was more generally distributed, with concentration in the collecting system. These findings were confirmed by competition binding assays giving Bmax values (ETB/ETA, fmol/mg protein), for medulla and cortex, respectively, of 18.7 +/- 2.2/11.3 +/- 2.7 and 12.7 +/- 3.9/7.6 +/- 3.5 for BQ3020; and 36.2 +/- 5.6/11.1 +/- 4.1 and 14.9 +/- 1.6/5.3 +/- 0.2 for BQ123. This study establishes ETA and ETB receptor distribution in human kidney and demonstrates that the novel ligands BQ123 and BQ3020 have at least thousand-fold selectivities for the ETA- and ETB-receptor subtypes, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
内皮素:一种有效的肾脏和全身血管收缩肽。
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内皮素,完整肾小管上皮细胞中 Na( )-K( )-ATP 酶的肽抑制剂。
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