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首页> 外文期刊>The Journal of Experimental Biology >D-GLUCOSE-SENSITIVE NEUROSECRETORY CELLS OF THE CRAB CANCER BOREALIS AND NEGATIVE FEEDBACK REGULATION OF BLOOD GLUCOSE LEVEL
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D-GLUCOSE-SENSITIVE NEUROSECRETORY CELLS OF THE CRAB CANCER BOREALIS AND NEGATIVE FEEDBACK REGULATION OF BLOOD GLUCOSE LEVEL

机译:蟹癌双核的D-葡萄糖敏感神经细胞和血液葡萄糖水平的负反馈调节

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We studied the effects of glucose on cultured X-organ neurons of the crab Cancer borealis using single-electrode current- and voltage-clamp techniques, A subpopulation of the cells responded to D-glucose with a hyperpolarization, These cells, but not glucose-insensitive cells, showed immunoreactivity to crustacean hyperglycemic hormone (CHH), the hormone responsible for the elevation of blood glucose levels in crustaceans, Glucose-sensitive cells were also inhibited by serotonin and gamma-aminobutyric acid but were not affected by dopamine and Leu-enkephalin. The response was specific for D-glucose, with an EC50 of 0.25 mmoll(-1). No response was seen to L-glucose, sucrose, galactose, mannose or fructose. The glucose response persisted in the absence of extracellular Na+ and in low-Ca2+/Mn2+ saline, In voltage-clamp experiments, D-glucose evoked a small current with a reversal potential close to that of voltage-dependent K+ currents, We conclude that D-glucose activates a K+ current in CHH-immunoreactive cells that, in normal saline, induces a hyperpolarization, We propose that this enables glucose to regulate directly the release of CHH into the hemolymph, thus constituting a negative feedback mechanism regulating hemolymph glucose concentration. [References: 36]
机译:我们使用单电极电流钳和电压钳技术研究了葡萄糖对蟹癌的X器官神经元培养的影响。细胞的亚群对D葡萄糖的反应是超极化的,但这些细胞却对葡萄糖没有反应。不敏感的细胞表现出对甲壳类高血糖激素(CHH)的免疫反应性,该激素可导致甲壳动物的血糖水平升高。葡萄糖敏感的细胞也受到血清素和γ-氨基丁酸的抑制,但不受多巴胺和亮脑啡肽的影响。该反应对D-葡萄糖具有特异性,EC50为0.25 mmoll(-1)。没有观察到对L-葡萄糖,蔗糖,半乳糖,甘露糖或果糖的反应。在不存在细胞外Na +和低Ca2 + / Mn2 +盐水的情况下,葡萄糖反应持续存在。 -葡萄糖激活CHH免疫反应性细胞中的K +电流,在生理盐水中可诱导超极化。我们建议,这可使葡萄糖直接调节CHH向血淋巴的释放,从而构成调节血淋巴葡萄糖浓度的负反馈机制。 [参考:36]

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