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Plasminogen activator has been implicated in tissue remodeling and cell migration during embryogenesis. In the developing nervous system, these processes are evident in the migration of neurons, axonal extension, Schwann cell migration, and the ensheathment and myelination of nerves. We have studied the production of plasminogen activator in cultures of superior cervical ganglia under conditions in which both neurons and glia are present. We have found that a principal source of the enzyme in these cultures is the glial cells and that the enzyme could not be detected at the growing tips of neurites. Plasminogen activator is also produced by Schwann cells isolated from neonatal rat sciatic nerve. The production of the enzyme by these cells is stimulated 6- to 10-fold by cholera toxin. Isolated Schwann cells and glial cells in the ganglion explant cultures produce the tissue form of plasminogen activator, a form of the enzyme not often found in nonmalignant cells. Preliminary experiments suggest that neuronal-glial interactions may regulate enzyme production by Schwann cells.

Production of plasminogen activator in cultures of superior cervical ganglia and isolated Schwann cells.