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The effects of medium conditioned by rat C6 glioma cells (C6-CM) on the survival, neurite formation, and catecholamine content of adrenal medullary cells in culture were investigated and compared with the effects of nerve growth factor (NGF). Adrenal medullary cells were isolated from 10-day-old rats and the proportions of surviving and neurite-extending cells were determined after 8 days in culture. In the presence of C6-CM virtually all seeded cells survived and 50% developed neuritic processes. In contrast, NGF did not support survival above control levels (30%) and induced neurite formation from approximately one-third of the surviving cells. C6-CM and NGF had no additive effects on neurite outgrowth. C6-CM-mediated fiber outgrowth was not inhibited by physiological concentrations of glucocorticoids which abolished the NGF-induced neurite formation. Both C6-CM and NGF increased the catecholamine content of the cultures and reduced the relative content of epinephrine. However, in view of its substantial effect on cell survival as compared to NGF, C6-CM caused a reduction of the catecholamine content per cell. We conclude that adrenal medullary cells, like other members of the sensory-sympathetic cell lineage of the neural crest, respond to glial-conditioned medium. This response differs both quantitatively and qualitatively from that mediated by NGF.

proceedings of the national academy of sciences of the united states of america

C6 glioma cell-conditioned medium induces neurite outgrowth and survival of rat chromaffin cells in vitro: comparison with the effects of nerve growth factor.