Characterization of the role of N-linked glycosylation on the cell signaling and expression of the human thromboxane A2 receptor alpha and beta isoforms.

Characterization of the role of N-linked glycosylation on the cell signaling and expression of the human thromboxane A2 receptor alpha and beta isoforms.
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N 连接糖基化对人血栓素 A2 受体 α 和 β 亚型的细胞信号传导和表达的作用的表征。

DOI:
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发表时间:
1998
影响因子:
3.5
通讯作者:
Kinsella Bt
Kinsella Bt
中科院分区:
医学2区
文献类型:
--
作者:
Marie;John F. Foley;Kinsella Bt

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血栓烷A2受体(TP)的α和β亚型介导前列腺素类血栓烷A2及其模拟物在人体内的作用。TP的氨基末端区域在天冬酰胺(N)残基N4和N16处含有两个共有N-连接糖基化位点。在这项研究中,我们探讨了N-连接的糖基化对人类TP亚型的信号转导和表面表达的意义。在人红白血病细胞和转染的人胚肾293细胞中,抑制N-连接的糖基化降低了TP与选择性放射性配体([3 H] SQ 29,548)的结合。此外,TPalpha的推定糖基化位点的定点诱变揭示,放射性配体结合对于单(TPalphaN 4-Q4、TPalphaN 16-Q16)和双(TPalphaN 4、N16-Q4、Q16)突变体两者也大大降低,对于双突变体,相对于野生型TPalpha产生8%的结合水平。配体结合的减少是由最大结合的减少引起的,而不是由[3 H] SQ 29,548或其他配体的受体的亲和力(Kd)或特异性的变化引起的。亚细胞分级分离证实,相对于总TP表达,在TPalphaN 4-Q4或TPalphaN 16-Q16中膜表达没有改变,但在TPalphaN 4、Q4-N16、Q16中降低至总表达的55%的水平。抑制糖基化减少,但没有消除,激动剂(U46619)介导的细胞内Ca++动员由TPalpha或TP β和cAMP生产由TPalpha。因此,人TP同种型的N-连接糖基化对于配体结合、有效的第二信使信号传导和有效的膜表达是重要的。
The alpha and beta isoforms of the thromboxane A2 receptor (TP) mediate the actions of the prostanoid thromboxane A2 and its mimetics in humans. The amino terminal region of the TPs contains two consensus N-linked glycosylation sites at asparagine (N) residues N4 and N16. In this study, we explored the significance of N-linked glycosylation on the signaling and surface expression of the human TP isoforms. Inhibition of N-linked glycosylation reduced selective radioligand ([3H]SQ29,548) binding by either TP in both human erythroleukemia cells and in transfected human embryonic kidney 293 cells. Moreover, site-directed mutagenesis of the putative glycosylation sites of TPalpha revealed that radioligand binding also was reduced greatly for both the single (TPalphaN4-Q4, TPalphaN16-Q16) and double (TPalphaN4,N16-Q4,Q16) mutants, yielding levels of 8% binding relative to the wild-type TPalpha for the double mutants. Reductions in ligand binding were caused by decreased maximal binding and not by changes in affinity (Kd) or in specificity of the receptors for [3H]SQ29,548 or other ligands. Subcellular fractionation confirmed that, in relation to total TP expression, membrane expression was not altered in TPalphaN4-Q4 or TPalphaN16-Q16 but was reduced to levels of 55% of total expression in TPalphaN4,Q4-N16,Q16. Inhibition of glycosylation reduced, but did not abolish, agonist (U46619) mediated intracellular Ca++ mobilization by TPalpha or TPbeta and cAMP production by TPalpha. Thus, N-linked glycosylation of the human TP isoforms is important for ligand binding, efficient second messenger signaling and efficient membrane expression.
选择性剪接在人内皮血栓素 A2 受体中产生不同的细胞质尾部。
DOI: --
发表时间: 1994
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影响因子: --
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DOI: --
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