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From the Weis Center for Research, Geisinger Clinic, Danville, Pa.
Correspondence to Harold A. Singer, PhD, Henry Hood MD Research Program, Weis Center for Research, PennState College of Medicine, 100 N Academy Ave, Danville, PA 17822-2612.
Abstract Exposure of cultured rat aortic vascular smooth
muscle (VSM) cells to the Ca2+ ionophore ionomycin produced
an increase in extracellular signalregulated kinase 1/2 (ERK1/2)
activity that was maximal between 2 and 5 minutes but then declined to
basal values within 20 minutes of stimulation. Elevation of
[Ca2+]i in VSM cells leads to an even more
rapid activation of Ca2+/calmodulin-dependent
protein kinase II (CaM kinase II); thus, it was postulated that the
Ca2+-dependent component of ERK1/2 activation was mediated
by CaM kinase II. Transient ERK1/2 activation by ionomycin was almost
completely abolished by pretreating cells with 30 µmol/L KN-93,
a CaM kinase II inhibitor. Treatment of cells with KN-93
did not antagonize the ability of ionomycin to mobilize intracellular
Ca2+ but prevented CaM kinase II and ERK1/2 activation with
almost identical potencies. Consistent with a role for
Ca2+ and calmodulin in intracellular
Ca2+induced activation of ERK, cells pretreated with
calmodulin inhibitors (W-7 or
calmidazolium) exhibited an attenuated ERK response
to ionomycin. ERK1/2 activation in response to phorbol esters and
platelet-derived growth factor were not significantly affected by
KN-93, whereas the response to angiotensin II and thrombin
were attenuated by 60% and 40%, respectively. Transient expression of
wild-type
2 CaM kinase II in COS-7 cells resulted in
increased ERK2 activity, whereas coexpression of wild-type and a
kinase-negative mutant resulted in a diminution of this response. These
data suggest that regulation of cellular responses by
Ca2+-dependent pathways in VSM cells may be mediated in
part by CaM kinase IIdependent activation of ERK1/2.
Key Words: Ca2+/calmodulin-dependent protein kinase II Ca2+ mitogen-activated protein kinase extracellular signalregulated kinase vascular smooth muscle
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