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Am J Physiol Regul Integr Comp Physiol. 2007 May;292(5):R2068-76. Epub 2007 Feb 1.

Knockdown of V-ATPase subunit A (atp6v1a) impairs acid secretion and ion balance in zebrafish (Danio rerio).

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1
Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan, ROC.

Abstract

In the skin of zebrafish embryo, the vacuolar H(+)-ATPase (V-ATPase, H(+) pump) distributed mainly in the apical membrane of H(+)-pump-rich cells, which pump internal acid out of the embryo and function similarly to acid-secreting intercalated cells in mammalian kidney. In addition to acid excretion, the electrogenic H(+) efflux via the H(+)-ATPases in the gill apical membrane of freshwater fish was proposed to act as a driving force for Na(+) entry through the apical Na(+) channels. However, convincing molecular physiological evidence in vivo for this model is still lacking. In this study, we used morpholino-modified antisense oligonucleotides to knockdown the gene product of H(+)-ATPase subunit A (atp6v1a) and examined the phenotype of the mutants. The H(+)-ATPase knockdown embryos revealed several abnormalities, including suppression of acid-secretion from skin, growth retardation, trunk deformation, and loss of internal Ca(2+) and Na(+). This finding reveals the critical role of H(+)-ATPase in embryonic acid -secretion and ion balance, as well.

PMID:
17272665
DOI:
10.1152/ajpregu.00578.2006
[Indexed for MEDLINE]
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