Pathways for Calcium Entry into Type I Cells: Significance for the Secretory Response

Pathways for Calcium Entry into Type I Cells: Significance for the Secretory Response
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钙进入 I 型细胞的途径:对分泌反应的意义

DOI:
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发表时间:
1987
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影响因子:
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通讯作者:
Constancio González
Constancio González
中科院分区:
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文献类型:
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作者:
A. Obeso;S. Fidone;Constancio González

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从生物物理学的角度来看,相关的数据在颈动脉体中的化学转导是难以解释的,也没有连贯的计划与I型细胞的膜特性的化学感受过程。因此,虽然已经报道I型细胞的膜电位不依赖于细胞外K+(Baron和Eyzaguirre,1977),但是当暴露于富含K+的培养基时,这些细胞仍然表现出多巴胺(DA)的Ca++依赖性释放(阿尔马拉斯等人,1985年)。当受到化学感受器刺激(低PO2或pH、高PCO2、药物等)的挑战时,这些细胞的膜特性(即,膜电位、比膜电阻和电容)表现出可变幅度和方向的变化,对于任何给定的刺激没有明确或一致的模式(Baron和Eyzaguirre,1977:Eyzaguirre等,1983年)。这样的观察结果使得很难制定一个统一的概念的生物物理方面的化学转导。
From a biophysical standpoint, data relevant to chemotransduction in the carotid body are difficult to interpret and there is no coherent scheme relating membrane properties of type I cells to the chemoreception process. Thus, while the membrane potential of type I cells has been reported to be independent of extracellular K+ (Baron and Eyzaguirre, 1977), these cells nonetheless exhibit a Ca++-dependent release of dopamine (DA) when exposed to K+-rich media (Almaraz et al., 1985). When challenged by chemoreceptor stimuli (low PO2 or pH, high PCO2, drugs, etc.), the membrane properties of these cells (i.e., membrane potential, specific membrane resistance and capacitance) exhibit changes of variable magnitude and direction, with no clear or consistent pattern for any given stimulus (Baron and Eyzaguirre, 1977: Eyzaguirre et al., 1983). Such observations render it difficult to formulate a unified concept of the biophysical aspects of chemotransduction.