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Originally published In Press as doi:10.1074/jbc.M007524200 on November 28, 2000
J. Biol. Chem., Vol. 276, Issue 8, 5613-5621, February 23, 2001
Signaling Pathways Underlying Muscarinic Receptor-induced
[Ca2+]i Oscillations in HEK293 Cells*
Dali
Luo ,
Lisa M.
Broad,
Gary
St. J. Bird, and
James W.
Putney Jr.§
From the Laboratory of Signal Transduction, NIEHS, National
Institutes of Health, Research Triangle Park, North Carolina 27709
We have investigated the signaling pathways
underlying muscarinic receptor-induced calcium oscillations in human
embryonic kidney (HEK293) cells. Activation of muscarinic receptors
with a maximal concentration of carbachol (100 µM)
induced a biphasic rise in cytoplasmic calcium
([Ca2+]i) comprised of release of
Ca2+ from intracellular stores and influx of
Ca2+ from the extracellular space. A lower concentration of
carbachol (5 µM) induced repetitive
[Ca2+]i spikes or oscillations, the continuation
of which was dependent on extracellular Ca2+. The entry of
Ca2+ with 100 µM carbachol and with the
sarcoplasmic-endoplasmic reticulum calcium ATPase inhibitor,
thapsigargin, was completely blocked by 1 µM
Gd3+, as well as 30-100 µM concentrations of
the membrane-permeant inositol 1,4,5-trisphosphate receptor inhibitor,
2-aminoethyoxydiphenyl borane (2-APB). Sensitivity to these inhibitors
is indicative of capacitative calcium entry. Arachidonic acid, a
candidate signal for Ca2+ entry associated with
[Ca2+]i oscillations in HEK293 cells, induced
entry that was inhibited only by much higher concentrations of
Gd3+ and was unaffected by 100 µM 2-APB. Like
arachidonic acid-induced entry, the entry associated with
[Ca2+]i oscillations was insensitive to
inhibition by Gd3+ but was completely blocked by 100 µM 2-APB. These findings indicate that the signaling
pathway responsible for the Ca2+ entry driving
[Ca2+]i oscillations in HEK293 cells is more
complex than originally thought, and may involve neither capacitative
calcium entry nor a role for PLA2 and arachidonic acid.
*
The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Present address: Dept. of Pharmacology, Harbin Medical University,
Harbin 150086, Peoples Republic of China.
§
To whom correspondence should be addressed: Laboratory of Signal
Transduction, NIEHS, National Institutes of Health, P. O. Box 12233, Research Triangle Park, NC 27709. Tel.: 919-541-1420; Fax:
919-541-7879; E-mail: putney@niehs.nih.gov.
Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2001 by the American Society for Biochemistry and Molecular Biology.
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