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  • Title: NHE-3 isoform of the Na+/H+ exchanger in human gallbladder. Localization of specific mRNA by in situ hybridization.
    Author: Silviani V, Gastaldi M, Planells R, Marteau C, Massacrier A, Cohen P, Cau P, Gerolami A.
    Journal: J Hepatol; 1997 Jun; 26(6):1281-6. PubMed ID: 9210615.
    Abstract:
    BACKGROUND/AIMS: Electroneutral absorption of NaCl by the gallbladder mucosa is likely to depend at least in part on a Na+/H+ exchanger. In intestine and colon, absorption due to Na+/H+ exchanger is explained by the presence of specific isoforms of the exchanger, the NHE-3 isoform and possibly the NHE-2 isoform. The aim of the present work was to determine whether the mRNAs coding for NHE-2 and NHE-3 are expressed in epithelial cells of human gallbladder. METHODS: Total RNAs from human gallbladder were subjected to reverse transcription-polymerase chain reaction using specific primers. No message was observed with NHE-2 specific primers, showing that NHE-2 isoform plays no role in gallbladder absorption. With NHE-3 specific primers, a 239 bp cDNA fragment was obtained and showed a high homology with the NHE-3 isoform, confirming the presence of NHE-3 in the gallbladder wall. This fragment was cloned in a pLitmus vector in order to produce cRNA probes by in vitro transcription. Cellular localization of the NHE-3 mRNA was studied on cryostat sections using the cRNA probes labeled with Digoxigenin-11-UTP, controls included assays with sense probe, antibodies without probe and RNaseA treated tissue. A specific staining of the NHE-3 mRNAs was found to be strictly localized to the gallbladder epithelial cells. RESULTS/CONCLUSIONS: Expression of NHE-3 in the gallbladder was found only in the absorptive epithelial cells. The NHE-3 isoform of the Na+/H+ exchanger is likely to be involved in water and electrolyte absorption from bile.
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