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Ionic Composition of Endolymph and Perilymph in the Inner Ear of the Oyster Toadfish Opsanus tau

机译:牡蛎蟾鱼内耳的内淋巴和外周淋巴的离子组成

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摘要

The concentrations of free Na+, K+, Ca2+, and Cl in endolymph and perilymph from the inner ear of the oyster toadfish, Opsanus tau, were measured in vivo using double-barreled ion-selective electrodes. Perilymph concentrations were similar to those measured in other species, while endolymph concentrations were similar to those measured previously in elasmobranch fish, though significantly different from concentrations reported in mammals. Perilymph concentrations (mean ± std. dev.) were as follows: Na+, 129 mmol l−1 ± 20; K+, 4.96 mmol l−1 ± 2.67; Ca2+, 1.83 mmol l−1 ± 0.27; and Cl, 171 mmol l−1 ± 20. Saccular endolymph concentrations were Na+, 166 mmol l−1 ± 22; K+, 51.4 mmol l−1 ± 16.7; Ca2+, 2.88 mmol l−1 ± 0.27; and Cl, 170 mmol l−1 ± 12; and semicircular canal (utricular vestibule) endolymph concentrations were Na+, 122 mmol l−1 ± 15; K+, 47.7 mmol l−1 ± 13.2; Ca2+, 1.78 mmol l−1 ± 0.48; Cl, 176 mmol l−1 ± 27. The relatively high concentrations of Ca2+ and Na+ in the endolymph may have significant implications for the physiological function of the mechanoelectrical transduction channels in the vestibular hair cells of fish compared to those of their mammalian counterparts.
机译:内淋巴和外淋巴中游离Na + ,K + ,Ca 2 + 和Cl -的浓度使用双管离子选择电极在体内测量牡蛎蟾鱼的内耳。外周淋巴液的浓度与其他物种的浓度相似,而内淋巴液的浓度与以前在弹bra鱼中测得的浓度相似,尽管与哺乳动物中报道的浓度明显不同。外周淋巴浓度(平均值±标准偏差)如下:Na + ,129 mmol l -1 ±20; K + ,4.96 mmol l -1 ±2.67; Ca 2 + ,1.83 mmol l -1 ±0.27;和Cl ,171 mmol l −1 ±20。囊内淋巴浓度为Na + ,166 mmol l −1 ±22; K + ,51.4 mmol l -1 ±16.7; Ca 2 + ,2.88 mmol l -1 ±0.27;和Cl -为170 mmol l -1 ±12;半规管(前庭)内淋巴浓度为Na + ,122 mmol l −1 ±15; K + ,47.7 mmol l -1 ±13.2; Ca 2 + ,1.78 mmol l -1 ±0.48; Cl -,176 mmol l −1 ±27。相对较高的Ca 2 + 和Na + 与哺乳动物的前庭毛细胞相比,内淋巴中的“内毒素”可能对鱼类前庭毛细胞中的机电转导通道的生理功能产生重要影响。

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