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J. Cell Biol.,
Volume 141, Number 1, April 6, 1998 175-185


* Department of Anatomy and Cell Biology, The asymmetric distribution of stable, posttranslationally modified microtubules (MTs) contributes to the polarization of many cell types, yet the factors controlling the formation of these MTs are not
known. We have found that lysophosphatidic acid (LPA) is a major serum factor responsible for rapidly
generating stable, detyrosinated (Glu) MTs in serum-starved 3T3 cells. Using C3 toxin and val14 rho we
showed that rho was both necessary and sufficient for
the induction of Glu MTs by LPA and serum. Unlike previously described factors that induce MT stability,
rho induced the stabilization of only a subset of the
MTs and, in wound-edge cells, these stable MTs were
appropriately oriented toward the leading edge of the
cell. LPA had little effect on individual parameters of
MT dynamics, but did induce long states of pause in a
subset of MTs near the edge of the cell. Rho stimulation of MT stability was independent of actin stress fiber formation. These results identify rho as a novel regulator of the MT cytoskeleton that selectively stabilizes
MTs during cell polarization by acting as a switch between dynamic and stable states of MTs rather than as
a modulator of MT assembly and disassembly.
Integrated Program in Cellular, Molecular, and Biophysical Studies, and
Department of Pathology, Columbia University, New York
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