Effects of dihydroergotoxine mesylate on aging neurons in vitro.

C1300 mouse neuroblastoma cells gradually accumulate lipofuscin-like pigment when they are maintained in culture. Pigment was demonstrated by positive straining for acid phosphatase and with periodic acid-Schiff stain. Pigment was formation in cells was reduced by exposure of the cells to lower doses of dihydroergotoxine mesylate which also induced neurite formation and increased protein synthesis. Since lipofuscin appears to originate as a result of wear and tear within the cells, the drug probably exerts its beneficial effects by reducing the rate of intracellular wear and tear associated with aging.