Effect of hyperosmotic stimulation on aquaporins gene expression in chick kidney

K. Sugiura, N. Aste, M. Fujii, K. Shimada, Noboru Saito

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Birds can produce hyperosmotic urine, but their renal morphology differs from that of mammals. Recent studies in mammals, suggested that various aquaporins (AQPs) are present in the kidney and play crucial roles in urine production. To elucidate the role of AQPs in the avian kidney, we first examined for the presence of AQP1, 2, 3, 4, 7 and 9 mRNAs in the chick (Gallus gallus) kidney by RT-PCR analysis. Next, we quantified variations of AQPs mRNAs levels in chick kidney after hyperosmotic stimulation (water-deprivation or salt-loading) by real-time RT-PCR analysis. Our study showed that in addition to AQP1, 2, 3, 4 and 7, chick kidney also expressed AQP9 and that hyperosmotic stimulation induced changes in AQPs expression. In particular, water-deprivation increased AQP2 and AQP3 mRNAs levels, whereas salt-loading induced a significant increase in AQP1, AQP2 and AQP9 mRNAs levels. AQP4 and AQP7 mRNA levels were not affected by any hyperosmotic stimulation. Taken together, these results indicated that the presence of AQPs in chick kidney is similar to that in mammals, that the chick kidney has an additional AQP9 and that AQP1, 2, 3 and 9 may play a crucial but different role in water permeability in this organ.

Original languageEnglish
Pages (from-to)173-179
Number of pages7
JournalComparative Biochemistry and Physiology - A Molecular and Integrative Physiology
Volume151
Issue number2
DOIs
Publication statusPublished - Oct 2008
Externally publishedYes

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Keywords

  • Aquaporin
  • Chicken
  • Gene expression
  • Hyperosmolality
  • Kidney

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Physiology

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