Sodium Movement in High Sodium Feline Red Cells
The transport of Na in the cat red cells has been studied under various experimental conditions. The unidirectional radioactive Na influx increased with increasing temperature until it reached a maximum value at 37°C ± 2°C and then decreased with a further increase in temperature. Errors stated in...
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| Format: | Online |
| Language: | English |
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The Rockefeller University Press
1971
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2203126/ |
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pubmed-2203126 |
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pubmed-22031262008-04-23 Sodium Movement in High Sodium Feline Red Cells Sha'afi, R. I. Hajjar, J. J. Article The transport of Na in the cat red cells has been studied under various experimental conditions. The unidirectional radioactive Na influx increased with increasing temperature until it reached a maximum value at 37°C ± 2°C and then decreased with a further increase in temperature. Errors stated in this paper represent 1.0 standard errors of the mean. The apparent activation energy was calculated in the region between 25 and 37°C and was found to be 4.9 ± 0.5 kcal/mole. Copper at a concentration of 0.04 mM inhibited this influx by 65%. When cells were suspended in isosmotic KCl buffer, cell volume was found to decrease initially with time. This unusual behavior is discussed in terms of Na to K preference of the cell membrane. In cat red cells, Na influx was found to increase about 13-fold when cell volume was decreased from 1.16 normal to 0.87. This effect could not be reproduced when the medium osmolarity was changed only by the addition of urea, a permeating molecule. On the other hand, K influx was found to decrease from 0.24 ± 0.03 mEq/liters RBC, hr at a relative cellular volume equal to 1.0 to 0.11 ± 0.01 mEq/liters RBC, hr at a cell volume of 0.75. Na influx in human red cells did not show any significant dependence on cell volume. The properties of Na movement in the cat red cells are compared to those of human red cells. The Rockefeller University Press 1971-06-01 /pmc/articles/PMC2203126/ /pubmed/5576766 Text en Copyright © 1971 by The Rockefeller University Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/). |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Sha'afi, R. I. Hajjar, J. J. |
| spellingShingle |
Sha'afi, R. I. Hajjar, J. J. Sodium Movement in High Sodium Feline Red Cells |
| author_facet |
Sha'afi, R. I. Hajjar, J. J. |
| author_sort |
Sha'afi, R. I. |
| title |
Sodium Movement in High Sodium Feline Red Cells |
| title_short |
Sodium Movement in High Sodium Feline Red Cells |
| title_full |
Sodium Movement in High Sodium Feline Red Cells |
| title_fullStr |
Sodium Movement in High Sodium Feline Red Cells |
| title_full_unstemmed |
Sodium Movement in High Sodium Feline Red Cells |
| title_sort |
sodium movement in high sodium feline red cells |
| description |
The transport of Na in the cat red cells has been studied under various experimental conditions. The unidirectional radioactive Na influx increased with increasing temperature until it reached a maximum value at 37°C ± 2°C and then decreased with a further increase in temperature. Errors stated in this paper represent 1.0 standard errors of the mean. The apparent activation energy was calculated in the region between 25 and 37°C and was found to be 4.9 ± 0.5 kcal/mole. Copper at a concentration of 0.04 mM inhibited this influx by 65%. When cells were suspended in isosmotic KCl buffer, cell volume was found to decrease initially with time. This unusual behavior is discussed in terms of Na to K preference of the cell membrane. In cat red cells, Na influx was found to increase about 13-fold when cell volume was decreased from 1.16 normal to 0.87. This effect could not be reproduced when the medium osmolarity was changed only by the addition of urea, a permeating molecule. On the other hand, K influx was found to decrease from 0.24 ± 0.03 mEq/liters RBC, hr at a relative cellular volume equal to 1.0 to 0.11 ± 0.01 mEq/liters RBC, hr at a cell volume of 0.75. Na influx in human red cells did not show any significant dependence on cell volume. The properties of Na movement in the cat red cells are compared to those of human red cells. |
| publisher |
The Rockefeller University Press |
| publishDate |
1971 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2203126/ |
| _version_ |
1611433383748960256 |