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Voltage‐dependent calcium and chloride currents in S17 bone marrow stromal cell line
Author(s) -
Silva Henrique B.,
Medei Emiliano,
Rodrigues Deivid C.,
Rondinelli Edson,
Almeida Norma A.S.,
Goldenberg Regina C.S.,
de Carvalho Antonio C. Campos,
Nascimento José H.M.
Publication year - 2010
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.22030
Subject(s) - chemistry , amiloride , chloride channel , extracellular , calcium , cystic fibrosis transmembrane conductance regulator , biophysics , membrane potential , medicine , sodium , endocrinology , biochemistry , biology , organic chemistry , gene
The bone marrow stromal cell line S17 has been used to study hematopoiesis in vitro. In this study, we demonstrate the presence of calcium and chloride currents in cultured S17 cells. Calcium currents were of low amplitude or barely detectable (50–100 pA). Hence to amplify the currents, we have used barium as a charge carrier. Barium currents were identified based on their distinct voltage‐dependence, and sensitivity to dihydropyridines. S17 cells also exhibited a slowly activating outward current without inactivation, most commonly seen when the sodium of the extracellular solution was replaced either by TEA (TEA/Cs saline) or NMDG (NMDG saline), or by addition of amiloride to the extracellular solution. This current was abolished either by 500 µM SITS (4,4′‐diisothiocyanatostilbene‐2‐2′‐disulfonic acid) or 500 µM DPC (diphenylamine‐2‐carboxylic acid) a cystic fibrosis transmembrane conductance regulator (CFTR) chloride channel blocker, identifying it as a Cl − current. RT‐PCR identified the presence of ENaC and CFTR transcripts. CFTR blockade reduced cell proliferation, suggesting that this channel plays a physiological role in regulation of S17 cell proliferation. J. Cell. Physiol. 223: 244–251, 2010. © 2009 Wiley‐Liss, Inc.