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J. Biol. Chem., Vol. 276, Issue 8, 5613-5621, February 23, 2001
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,
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.
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.
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