Neuron. 1992 Jan;8(1):25-44.

Myosin II distribution in neurons is consistent with a role in growth cone motility but not synaptic vesicle mobilization.

Miller M, Bower E, Levitt P, Li D, Chantler PD.

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Department of Anatomy and Neurobiology, Medical College of Pennsylvania, Philadelphia 19129.

Abstract

We have generated a polyclonal antibody against myosin II from a neuronally derived cell line in order to assess potential roles for myosin II in growth cone movement and synaptic transmission. The distribution of neuronal myosin II, in isolated cells as well as in tissues of the adult rat brain and spinal cord, was examined at the light microscopic and ultrastructural levels. In isolated neuroblastoma cells and dorsal root ganglion neurons, myosin II was found at the leading edge of growth cones, within neuritic processes and cell soma, and adjacent to the plasma membrane. The subcellular distribution of myosin II overlapped significantly with that of both actin and single-headed myosin I. These results implicate both myosin I and myosin II as molecular motors required for neurite elongation and growth cone motility. An exclusive postsynaptic distribution of myosin II in neurons of the mature central nervous system suggests that myosin II cannot play a role in the mobilization of synaptic vesicles, but could participate in synaptic plasticity.

PMID:: 1730005; [PubMed - indexed for MEDLINE]

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