Tufts B L, Boutilier R G
Biology Department, Dalhousie University, Halifax, Nova Scotia, Canada.
Exp Biol. 1990;48(6):341-7.
The CO2 transport properties of the blood of the hagfish, Myxine glutinosa are markedly different from those previously demonstrated for the lamprey, Petromyzon marinus. As in most other vertebrates, the majority of the CO2 in Myxine blood is transported in the form of plasma bicarbonate. Erythrocyte bicarbonate does have some access to the plasma in the blood of Myxine although the documented bicarbonate movements were not sensitive to the chloride/bicarbonate exchange inhibitor, 4,4-diisothiocyanatostilbene-2,2-disulphonic acid (DIDS). The transmembrane pH gradient in hagfish erythrocytes is also quite different from the gradient previously demonstrated in other agnathans. As in other agnathans, significant differences do occur between the distribution ratios for protons, chloride and bicarbonate ions across the erythrocyte membrane, although the magnitude of these differences is smaller in Myxine. Finally, the absence of pH-dependent changes in erythrocyte water content appears to be a common feature of agnathan erythrocytes.
盲鳗（Myxine glutinosa）血液的二氧化碳运输特性与之前对七鳃鳗（Petromyzon marinus）所证明的特性明显不同。与大多数其他脊椎动物一样，盲鳗血液中的大部分二氧化碳以血浆碳酸氢盐的形式运输。尽管有记录的碳酸氢盐转运对氯离子/碳酸氢盐交换抑制剂4,4 - 二异硫氰基芪 - 2,2 - 二磺酸（DIDS）不敏感，但盲鳗血液中红细胞内的碳酸氢盐确实有一些进入血浆的途径。盲鳗红细胞中的跨膜pH梯度也与之前在其他无颌类动物中所证明的梯度有很大不同。与其他无颌类动物一样，质子、氯离子和碳酸氢根离子在红细胞膜两侧的分布比例确实存在显著差异，尽管在盲鳗中这些差异的程度较小。最后，红细胞含水量不存在pH依赖性变化似乎是无颌类动物红细胞的一个共同特征。
