Niflumic acid inhibits ATP-stimulated exocytosis in a mucin-secreting epithelial cell line

被引:18
作者
Bertrand, CA
Danahay, H
Poll, CT
Laboisse, C
Hopfer, U
Bridges, RJ
机构
[1] Univ Pittsburgh, Sch Med, Dept Cell Biol & Physiol, Pittsburgh, PA 15261 USA
[2] Novartis Resp Res Ctr, Horsham RH12 5AB, W Sussex, England
[3] Univ Nantes, Inst Natl Sante & Rech Med 94 04, F-44035 Nantes, France
[4] Case Western Reserve Univ, Dept Physiol & Biophys, Cleveland, OH 44106 USA
来源
AMERICAN JOURNAL OF PHYSIOLOGY-CELL PHYSIOLOGY | 2004年 / 286卷 / 02期
关键词
capacitative calcium entry; membrane capacitance; chloride channels; fura; 2;
D O I
10.1152/ajpcell.00593.2002
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
ATP is an efficacious secretagogue for mucin and chloride in the epithelial cell line HT29-Cl.16E. Mucin release has been measured as [H-3] glucosamine-labeled product in extracellular medium and as single-cell membrane capacitance increases indicative of exocytosis-related increases in membrane area. The calcium-activated chloride channel blocker niflumic acid, also reported to modulate secretion, was used to probe for divergence in the purinergic signaling of mucin exocytosis and channel activation. With the use of whole cell patch clamping, ATP stimulated a transient capacitance increase of 15 +/- 4%. Inclusion of niflumic acid significantly reduced the ATP-stimulated capacitance change to 3 +/- 1%, although normalized peak currents were not significantly different. Ratiometric imaging was used to assess intracellular calcium (Ca-i(2+)) dynamics during stimulation. In the presence of niflumic acid, the ATP-stimulated peak change in Ca-i(2+) was unaffected, but the initial response and overall time to Ca-i(2+) peak were significantly affected. Excluding external calcium before ATP stimulation or including the capacitative calcium entry blocker LaCl3 during stimulation muted the initial calcium transient similar to that observed with niflumic acid and significantly reduced peak capacitance change, suggesting that a substantial portion of the ATP-stimulated mucin exocytosis in HT2-9Cl.16E depends on a rapid, brief calcium influx through the plasma membrane. Niflumic acid interferes with this influx independent of a chloride channel blockade effect.
引用
收藏
页码:C247 / C255
页数:9
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