title: Separate factors produced by the CNS of the snail Helisoma stimulate neurite outgrowth and choline metabolism in cultured neurons.
abstract: Neurons from the snail Helisoma require a brain-derived factor(s) for neurite outgrowth in both organ and isolated cell culture. This factor is released from the CNS of Helisoma when brains are incubated in defined medium, producing a conditioned medium (CM). In addition to its growth-promoting activity, CM also enhances total uptake of 3H-choline and the incorporation of 3H-choline into specific metabolites: acetylcholine, phosphorylcholine and lipid. This choline metabolism-enhancing factor(s) is distinct and separable from neurite growth-promoting factor: 1. Over 95% of neurite growth-promoting activity can be removed from CM by adsorption to a polylysine surface while there is no loss of choline metabolism-enhancing activity. 2. When central ganglia were treated with anisomycin, a potent inhibitor of molluscan protein synthesis, the choline metabolism-enhancing activity was completely absent from the resulting CM, while the growth promoting activity was reduced by only 35%. These results suggest that the Helisoma CNS produces a variety of trophic factors that are involved in regulating the interaction between neuronal growth and metabolism.
mesh_terms: D002478:Cells, Cultured; D002794:Choline / Q000378:metabolism*; D005724:Ganglia / Q000032:analysis* / Q000254:growth & development / Q000378:metabolism; D009414:Nerve Growth Factors / Q000032:analysis* / Q000494:pharmacology; D009474:Neurons / Q000187:drug effects; D009924:Organ Culture Techniques; D012908:Snails / Q000032:analysis*
chemical_list: D009414:Nerve Growth Factors; D002794:Choline