Abstract:
:Adequate regulation of endolymphatic pH is essential for maintaining inner ear function. The Na(+)-H(+) exchanger (NHE) is a major determinant of intracellular pH (pH(i)), and facilitates Na(+) and fluid absorption in various epithelia. We determined the functional and molecular expression of NHEs in cultured human endolymphatic sac (ES) epithelial cells and examined the effect of IFN-gamma on NHE function. Serial cultures of human ES epithelial cells were generated from tissue samples. The molecular expression of NHE1, -2, and -3 isoforms was determined by real-time RT-PCR. The functional activity of NHE isoforms was measured microfluorometrically using a pH-sensitive fluorescent dye, 2',7'-bis(carbonylethyl)-5(6)-carboxyfluorescein (BCECF), and a NHE-inhibitor, 3-methylsulfonyl-4-piperidinobenzoyl guanidine methanesulfonate (HOE694). NHE1, -2, and -3 mRNAs were expressed in human ES epithelial cells. Functional activity of NHE1 and -2 was confirmed in the luminal membrane of ES epithelial cells by sequentially suppressing Na(+)-dependent pH(i) recovery from intracellular acidification using different concentrations of HOE694. Treatment with IFN-gamma (50 nM for 24 h) suppressed mRNA expression of NHE1 and -2. IFN-gamma also suppressed functional activity of both NHE1 and -2 in the luminal membrane of ES epithelial cells. This study shows that NHEs are expressed in cultured human ES epithelial cells and that treatment with IFN-gamma suppresses the expression and functional activity of NHE1 and -2.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Son EJ,Moon IS,Kim SH,Kim SJ,Choi JYdoi
10.1002/jcb.22201subject
Has Abstractpub_date
2009-08-01 00:00:00pages
965-72issue
5eissn
0730-2312issn
1097-4644journal_volume
107pub_type
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