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首页> 外文期刊>Chemical Senses >Non-synaptic Transformation of Gustatory Receptor Potential by Stimulation of the Parasympathetic Fiber of the Frog Glossopharyngeal Nerve
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Non-synaptic Transformation of Gustatory Receptor Potential by Stimulation of the Parasympathetic Fiber of the Frog Glossopharyngeal Nerve

机译：通过刺激青蛙舌咽神经副交感神经纤维对突触受体电位的非突触转化。

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摘要

When the glossopharyngeal nerve (GP) in the frog was strongly stimulated electrically, slow potentials were elicited from the tongue surface and taste cells in the fungiform papillae. Injection of atropine completely blocked these slow potentials. The present and previous data indicate that the slow potentials induced in the tongue surface and taste cells are due to a liquid junction potential between saliva secreted from the lingual glands due to parasympathetic fiber activity and an adapting solution on the tongue surface. Intracellularly recorded depolarizing receptor potentials in tastf! cells induced by 0.5 M NaO and 3 mM acetic acid were enhanced by depolarizing slow potentials induced by GP nerve stimulation, but were depressed by the hyperpolarizing slow potentials. On average, the receptor potential of taste cells for 0.5 M NaO was increased by 25% by the GP nerve-induced slow potential, but the receptor potential of taste cells for 3 mM acetic acid was decreased by 1% by the slow potential. These transformations of receptor potentials in frog taste cells were not due to a synaptic event initiated between taste cells and the efferent nerve fiber, but due to a non-synaptic event, a lingual junction potential generated in the dorsal lingual epithelium by GP nerve stimulation.
机译：当强烈刺激青蛙的舌咽神经（GP）时，会从舌头表面和真菌状乳头中的味觉细胞中激发出缓慢的电位。阿托品的注射完全阻断了这些缓慢的潜力。目前和以前的数据表明，在舌表面和味觉细胞中诱导的缓慢电位是由于副交感神经纤维活性从舌腺分泌的唾液与舌表面的适应溶液之间的液体结合电位所致。 tastf！中细胞内记录的去极化受体电位0.5 M NaO和3 mM乙酸诱导的细胞通过GP神经刺激诱导的慢电位去极化而增强，但被超极化慢电位抑制。平均而言，GP神经诱导的慢电位使味觉细胞对0.5 M NaO的受体电位提高了25％，而慢电位使味觉细胞对3 mM乙酸的受体电位降低了1％。青蛙味觉细胞中受体电位的这些转变不是由于味觉细胞与传出的神经纤维之间发生的突触事件，而是由于非突触事件，是由GP神经刺激在背侧舌上皮中产生的舌交界电位。

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