Volume and pH regulation in agnathan erythrocytes: comparisons between the hagfish,Myxine glutinosa,and the lampreys,Petromyzon marinus and Lampetra fluviatilis |
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| Authors: | M. Nikinmaa B. L. Tufts R. G. Boutilier |
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| Affiliation: | (1) Department of Zoology, University of Helsinki, P.O. Box 17, SF-00014 Helsinki, Finland;(2) Department of Biology, Dalhousie University, B3H4J1 Halifax, Nova Scotia, Canada;(3) Present address: Department of Biology, Queens University, Kingston, Ontario, Canada;(4) Present address: Department of Zoology, Downing Street, CB2 3EJ Cambridge, England |
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| Abstract: | The responses of hagfish (Myxine glutinosa) and lamprey (Lampetra fluviatilis and Petromyzon marinus) erythrocytes to osmotic swelling in hypoosmotic medium and to acid-base disturbances induced by ammonium chloride prepulse were studied. The erythrocytes of hagfish regulated neither cell volume after osmotic swelling nor intracellular pH after acidification. In contrast, the erythrocytes of lamprey lost potassium and chloride after osmotic swelling, whereby their volume recovered. Furthermore, the red cell pH of lamprey recovered from experimental acidification in a nominally bicarbonate-free medium in the presence of sodium, confirming that the pathway involved is sodium/proton exchange.Abbreviation DMO 5,5-dimethyloxazolidine-2,4-dione |
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| Keywords: | Erythrocytes ion transport sodium/proton exchange Hagfish, Myxine Lampreys, Lampreta, Petromyzon |
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