Tonic activity of Galpha-gustducin regulates taste cell responsivity.

Tonic activity of Galpha-gustducin regulates taste cell responsivity.
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DOI:
10.1016/j.febslet.2008.10.007
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发表时间:
2008-11-12
期刊:
影响因子:
3.5
通讯作者:
Kinnamon SC
Kinnamon SC
中科院分区:
生物学3区
文献类型:
--
作者:
Clapp TR;Trubey KR;Vandenbeuch A;Stone LM;Margolskee RF;Chaudhari N;Kinnamon SC

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味觉选择性G蛋白α-味觉传导素(α-gus)与α-转导素同源,在体外激活磷酸二酯酶。α- gustducin敲除小鼠对苦味、甜味和鲜味的味觉刺激受损,表明其在味觉转导中起核心作用。在这里,我们提出了g - α-gustducin的不同作用。在α-gustducin敲除小鼠的味蕾中,与野生型小鼠相比,基础(未刺激)cAMP水平较高。此外,一种camp依赖性蛋白激酶抑制剂H-89在敲除小鼠的gustducin谱系细胞中显著地揭示了对苦味地那铵的反应。我们认为α-gustducin的一个重要作用是维持低cAMP水平以确保充足的Ca2+信号。
The taste-selective G protein, α-gustducin (α-gus) is homologous to α-transducin and activates phosphodiesterase in vitro. α-Gustducin-knockout mice are compromised to bitter, sweet and umami taste stimuli, suggesting a central role in taste transduction. Here, we suggest a different role for Gα-gustducin. In taste buds of α-gustducin knockout mice, basal (unstimulated) cAMP levels are high compared to those of wild-type mice. Further, H-89, a cAMP-dependent Protein Kinase inhibitor, dramatically unmasks responses to the bitter tastant denatonium in gustducin-lineage cells of knockout mice. We propose that an important role of α-gustducin is to maintain cAMP levels tonically low to ensure adequate Ca2+ signaling.
DOI: 10.1038/382083a0
发表时间: 1996-07-04
期刊: NATURE
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