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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-1332

Lötscher, M; Kaissling, B; Biber, J; Murer, H; Levi, M (1997). Role of microtubules in the rapid regulation of renal phosphate transport in response to acute alterations in dietary phosphate content. Journal of Clinical Investigation, 99(6):1302-1312.

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Renal proximal tubular response to acute administration of a low Pi diet is characterized by a rapid adaptive increase in apical brush border membrane (BBM) Na-Pi cotransport activity and Na-Pi cotransporter protein abundance, independent of a change in Na-Pi cotransporter mRNA levels (Levi, M., M. Lötscher, V. Sorribas, M. Custer, M. Arar, B. Kaissling, H. Murer, and J. Biber. 1994. Am. J. Physiol. 267: F900-F908). The purposes of the present study were to determine if the acute adaptive response occurs independent of de novo protein synthesis, and if microtubules play a role in the rapid upregulation of the Na-Pi cotransporters at the apical BBM. We found that inhibition of transcription by actinomycin D and translation by cycloheximide did not prevent the rapid adaptive response. In addition, in spite of a 3.3-fold increase in apical BBM Na-Pi cotransporter protein abundance, there was no change in cortical homogenate Na-Pi cotransporter protein abundance. Pretreatment with colchicine, which resulted in almost complete disruption of the microtubular network, abolished the adaptive increases in BBM Na-Pi cotransport activity and Na-Pi cotransporter protein abundance. In contrast, colchicine had no effect on the rapid downregulation of Na-Pi cotransport in response to acute administration of a high Pi diet. We conclude that the rapid adaptive increase in renal proximal tubular apical BBM Na-Pi cotransport activity and Na-Pi cotransporter abundance is independent of de novo protein synthesis, and is mediated by microtubule-dependent translocation of presynthesized Na-Pi cotransporter protein to the apical BBM.


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Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Physiology
07 Faculty of Science > Institute of Physiology
Dewey Decimal Classification:570 Life sciences; biology
Date:15 March 1997
Deposited On:11 Feb 2008 12:22
Last Modified:05 Apr 2016 12:18
Publisher:American Society for Clinical Investigation
Publisher DOI:10.1172/JCI119289
Related URLs:http://www.jci.org/cgi/content/abstract/99/6/1302
PubMed ID:9077540

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