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The Journal of Neuroscience, August 15, 2001, 21(16):6159-6169
Myosin IIB Is Required for Growth Cone Motility
Paul C.
Bridgman1,
Sonya
Dave1,
Clara F.
Asnes2,
Antonella N.
Tullio3, and
Robert S.
Adelstein3
Departments of 1 Anatomy and Neurobiology and
2 Biochemistry and Molecular Biophysics, Washington
University School of Medicine, St. Louis, Missouri 63110, and
3 Laboratory of Molecular Cardiology, National Heart, Lung,
and Blood Institute, National Institutes of Health, Bethesda, Maryland
20892
Growth cones are required for the forward advancement and
navigation of growing axons. Modulation of growth cone shape and reorientation of the neurite are responsible for the change of outgrowth direction that underlies navigation. Change of shape involves
the reordering of the cytoskeleton. Reorientation of the neurite
requires the generation of tension, which is supplied by the ability of
the growth cone to crawl on a substrate. The specific molecular
mechanisms responsible for these activities are unknown but are thought
to involve actomyosin-generated force combined with linkage to the cell
surface receptors that are responsible for adhesion (Heidemann and
Buxbaum, 1998). To test whether myosin IIB is responsible for the force
generation, we quantified shape dynamics and filopodial-mediated
traction force in growth cones from myosin IIB knock-out (KO) mice and
compared them with neurons from normal littermates. Growth cones from
the KO mice spread less, showed alterations in shape dynamics and actin
organization, and had reduced filopodial-mediated traction force.
Although peak traction forces produced by filopodia of KO cones were
decreased significantly, KO filopodia occasionally developed
forces equivalent to those in the wild type. This indicates that other
myosins participate in filopodial-dependent traction force. Therefore,
myosin IIB is necessary for normal growth cone spreading and the
modulation of shape and traction force but acts in combination with
other myosins for some or all of these activities. These activities are
essential for growth cone forward advancement, which is necessary for
outgrowth. Thus outgrowth is slowed, but not eliminated, in neurons
from the myosin IIB KO mice.
Key words:
growth cones; motility; myosin; actin; traction force; knock-out mice
Copyright © 2001 Society for Neuroscience 0270-6474/01/21166159-11$05.00/0
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