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Vol. 13, Issue 12, 4470-4483, December 2002
Department of Biochemistry, Weill Medical College of Cornell
University, New York, New York 10021
The development of cell polarity in response to chemoattractant
stimulation in human polymorphonuclear neutrophils (PMNs) is
characterized by the rapid conversion from round to polarized morphology with a leading lamellipod at the front and a uropod at the
rear. During PMN polarization, the microtubule (MT) array undergoes a
dramatic reorientation toward the uropod that is maintained during
motility and does not require large-scale MT disassembly or cell
adhesion to the substratum. MTs are excluded from the leading lamella
during polarization and motility, but treatment with a myosin light
chain kinase inhibitor (ML-7) or the actin-disrupting drug cytochalasin
D causes an expansion of the MT array and penetration of MTs into the
lamellipod. Depolymerization of the MT array before stimulation caused
10% of the cells to lose their polarity by extending two opposing
lateral lamellipodia. These multipolar cells showed altered
localization of a leading lamella-specific marker, talin, and a
uropod-specific marker, CD44. In summary, these results indicate that
F-actin- and myosin II-dependent forces lead to the development and
maintenance of MT asymmetry that may act to reinforce cell polarity
during PMN migration.
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