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Burnham, C.E. et al.

Cloning, renal distribution, and regulation of the rat Na+-HCO3- cotransporter.

We recently reported the cloning and expression of a human kidney Na+-HCO3- cotransporter (NBC-1) (C. E. Burnham, H. Amlal, Z. Wang, G. E. Shull, and M. Soleimani. J. Biol. Chem. 272: 19111-19114, 1997). To expedite in vivo experimentation, we now report the cDNA sequence of rat kidney NBC-1. In addition, we describe both the organ and nephron segment distributions and the regulation of NBC-1 mRNA under three models of pH stress: chloride-depletion alkalosis (CDA), metabolic acidosis, and bicarbonate loading. Rat NBC-1 cDNA encodes an open reading frame of 1,035 amino acids, with 96 and 87% identity to human and salamander NBC-1, respectively. Rat NBC-1 mRNA is expressed at high levels in kidney and brain, with lower levels in colon, stomach, and heart. None appears in liver. In the kidney, NBC-1 is expressed mainly in the proximal tubule, with traces found in medullary thick ascending limb and papilla. HCO3- loading decreased NBC-1 mRNA levels, which were unchanged either by metabolic acidosis or by CDA.[1]

References

Cloning, renal distribution, and regulation of the rat Na+-HCO3- cotransporter. Burnham, C.E., Flagella, M., Wang, Z., Amlal, H., Shull, G.E., Soleimani, M. Am. J. Physiol. (1998) [Pubmed]

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