Transduction and adaptation in sensory receptor cells

Transduction and adaptation in sensory receptor cells
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感觉受体细胞的转导和适应

DOI:
10.1523/jneurosci.15-12-07757.1995
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发表时间:
1995
影响因子:
0.6
通讯作者:
Anna Menini
Anna Menini
中科院分区:
--
文献类型:
--
作者:
Vincent Torre;Jonathan Ashmore;T. Lamb;Anna Menini

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感觉传导在广泛不同的感觉形式中具有共同的特征。这篇文章的目的是检查在视觉,嗅觉和听觉的感觉受体细胞的转导的基本机制的相似性和差异。这两个系统之间的主要区别之一与刺激的性质有关。在视觉和嗅觉系统中,量子检测机制是可能的,因为光子的吸收或气味分子的结合提供了比受体分子中的热噪声大得多的能量变化。另一方面,在听觉中,声子的能量要低得多,并且通过“经典”机制进行检测。对于脊椎动物的光感受器和嗅觉感受器细胞,感觉转导采用G蛋白级联,这是非常相似的两种情况下,这是密切同源的其他G蛋白信号级联。对于听觉和前庭毛细胞,转导通过刺激与离子通道直接耦合的机制进行,其方式让人想起各种突触机制中突触后离子通道的直接门控。这三类感觉感受器细胞在其适应机制方面具有相似性,并且在每种情况下,细胞质钙浓度在适应中起主要作用。
Sensory transduction shares common features in widely different sensory modalities. The purpose of this article is to examine the similarities and differences in the underlying mechanisms of transduction in the sensory receptor cells for vision, olfaction, and hearing. One of the major differences between the systems relates to the nature of the stimulus. In both the visual and olfactory systems a quantal mechanism of detection is possible, because the absorption of a photon or the binding of an odorant molecule provides an energy change significantly greater than the thermal noise in the receptor molecule. In hearing, on the other hand, the energy of a phonon is far lower, and detection occurs by a “classical” mechanism. For vertebrate photoreceptors and olfactory receptor cells, sensory transduction employs a G protein cascade that is remarkably similar in the two cases, and that is closely homologous to other G protein signaling cascades. For auditory and vestibular hair cells, transduction operates via a mechanism of direct coupling of the stimulus to ion channels, in a manner reminiscent of the direct gating of post-synaptic ion channels in various synaptic mechanisms. The three classes of sensory receptor cell share similarities in their mechanisms of adaptation, and it appears in each case that cytoplasmic calcium concentration plays a major role in adaptation.
视觉兴奋和恢复。
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
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钙在调节视网膜视杆光转导环 GMP 级联中的作用。
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影响因子: 11.1
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