NHE-1 Is The Sodium-hydrogen Exchanger Isoform ... - PubMed

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• Biochim Biophys Acta. 2004 Nov 17;1667(1):101. Soliemani, M [corrected to Soleimani, M]

Abstract

Erythrocyte sodium hydrogen exchanger (NHE) represents one of a limited number of sodium entry pathway in erythrocytes. At least five NHE isoforms have been identified, differing in tissue specificity, regulatory characteristics, and pharmacological sensitivities. Although physiological characteristics of erythrocyte NHE suggest that the widely expressed NHE-1 isoform may be present, evidence is not conclusive and does not exclude the existence of other isoforms. In this study, Northern blot and reverse transcription-polymerase chain reaction (RT-PCR) analyses were used to test for five NHE isoforms in erythroid cells. Blood from patients with sickle cell disease was depleted of white blood cells (WBC) by passage through leukocyte filters and cellulose column. RT-PCR performed on WBC depleted reticulocyte RNA using a NHE-1 primer set yielded product a of expected size, the sequence of which was identical to the published human NHE-1 sequence. Northern blot analysis of the reticulocyte RNA using a 1.6 kb probe revealed a message of approximately 5.0 kb in size. RT-PCR analysis of rat kidney RNA using primers specific for NHE isoforms -2, -3, -4 and rat brain RNA using primer specific for NHE-5 isoform yielded products of expected size, whereas WBC depleted RNA under identical conditions yielded no products. These results identify the erythroid isoform of the sodium hydrogen exchanger as NHE-1.

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