Cloning of a Na/Pi cotransporter from opossum kidney cells.

Opossum kidney (OK) cells have been extensively used to study cellular mechanisms of renal proximal tubular Na/P(i) cotransport. We have cloned a cDNA (NaPi-4) most likely encoding an apical Na/P(i) cotransporter from OK cells. The cloning strategy was based on homology to the recently cloned human renal (NaPi-3) Na/P(i) cotransporter (Magagnin, S., Werner, A., Markovich, D., Sorribas, V., Stange, G., Biber, J., and Murer, H. (1993) Proc. Natl. Acad. Sci. U. S. A. 90, 5979-5983). Kinetic characterization (P(i) interaction, sodium interaction, and pH dependence) of NaPi-4-induced Na/P(i) uptake showed high similarity to apical Pi transport in OK cell monolayers. The NaPi-4 cDNA is 2548 base pairs long and encodes a protein of 70.5 kDa, containing at least 8 predicted transmembrane domains. Northern blot analysis with OK cell mRNA shows a NaPi-4-related signal (2.5 kilobases) in cells grown on impermeant and permeant supports. Hybrid depletion with NaPi-4 antisense oligonucleotides abolished the mRNA-induced Na/P(i) cotransport in oocytes. Similarly, NaPi-4 antisense oligonucleotides inhibited (up to 70%) Na/P(i) cotransport in OK cell monolayers. We presume that NaPi-4 is closely related to the OK cell apical Na/P(i) cotransporter.

• Publication year

  1994

• Venue

  Journal of Biological Chemistry

• Publication date

  1994-03-04

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/s0021-9258(17)37417-3PMID 7509808
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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