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Role of various membrane transport mechanisms on erythrocyte osmotic resistance to lysing in the American bullfrog (Rana Catesbelana)

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dc.contributor.author Ziegler, Jennifer J.
dc.date.accessioned 2012-05-30T13:18:14Z
dc.date.available 2012-05-30T13:18:14Z
dc.date.created 2002 en_US
dc.date.issued 2012-05-30
dc.identifier.uri http://hdl.handle.net/123456789/1160
dc.description vi, 31 leaves en_US
dc.description.abstract Previous studies have shown that the erythrocytes of amphibians are much less likely to lyse in hyposmotic conditions as are the erythrocytes of mammals. Such resistance to lysing may be the result of volume regulating membrane transport systems in amphibian erythrocytes. To determine the role of these membrane transport systems, blood was collected from American bullfrogs (Rana catesbeiana) and mice (Mus museu/us) and erythrocytes were treated with one ofthe following specific membrane transport inhibitors: furosemide, 4,4'-diidothiocyanatostilbene-2,2'-disulphonic acid (DIDS), and [(dihydroindenyl)oxy] alkanoic acid (DIOA). After exposure to furosemide, DIDS, DIOA, or all the inhibitors together the osmolality of the solution at which 50 percent of the erythrocytes had undergone lysis (50% lysis) was determined for both bullfrogs and mice. Furosemide, an inhibitor of the K+/Cr cotransporter and the Na+/K+/Cr cotransporter, and DIDS, an inhibitor of anion exchange, caused a significant increase in the lysing of mouse erythrocytes, but had no significant effect on bullfrog erythrocytes. However, exposure of erythrocytes to DIOA, a potent inhibitor of the K+/Cr cotransporter, resulted in increased lysing of both mouse and bullfrog erythrocytes, with the effect being greater for mouse erythrocytes. Trials using all the inhibitors together also resulted in increased bullfrog erythrocyte lysing. Thus, the disabling of only specific membrane transport systems in frog erythrocytes hinders the cells' ability to volume regulate. Additionally, the bullfrog erythrocytes appear to be less affected by the inhibition of membrane transport mechanisms than mouse erythrocytes. This suggests that bullfrog erythrocytes possess either additional volume regulatory membrane transport mechanisms or other means by which they tolerate hyposmotic environments. en_US
dc.language.iso en_US en_US
dc.subject Bullfrog-Habitations. en_US
dc.title Role of various membrane transport mechanisms on erythrocyte osmotic resistance to lysing in the American bullfrog (Rana Catesbelana) en_US
dc.type Thesis en_US
dc.college las en_US
dc.advisor David K. Saunders en_US
dc.department biological sciences en_US

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