Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 331, Issue 4, Pages 1229-1238Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2005.04.038
Keywords
fish; Na plus -K plus -ATPase; sodium pump; genes; osmoregulation; hormones
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The full length genes encoding the catalytic a and glycosylated b subunits of the sodium pump (Na+-K+-ATPase) were cloned and characterized from silver sea bream gill. Using in vitro preparations of gill tissue it was found that growth hormone (10 and 100 ng/ml) caused an increase in subunit transcription, translation, and Na+-K+-ATPase enzyme activity. Similarly, insulin-like growth factor 1 (10 and 100 ng/ml) also caused an increase in Na+-K+-ATPase subunit amounts and enzyme activity. Cortisol (10 and 100 ng/ml) increased a subunit transcript and protein but did not modulate b subunit expression or enzyme activity. Ovine prolactin did not cause any changes in Na+-K+-ATPase subunit transcription, translation or enzyme activity. This study is the first to describe how both Na+-K+-ATPase a and b subunits are modulated at transcriptional and translational levels in fish osmoregulatorv tissue upon exposure to hormones. 2005 Elsevier Inc. All rights reserved.
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