title: Synergistic growth promoting action of L-cysteine and nitrogen upon Hymenolepis diminuta cysticercoids in vitro.
abstract: Development in vitro of cysticercoids of the cestode Hymenolepis diminuta in the presence of L-cysteine proceeded twice as rapidly under 100% nitrogen as it did with air as the gas phase. No growth was obtained with the following: D-cysteine, L-cysteine methyl ester, S-aminoethyl cysteine, L-cystine, glutathione (reduced), L-methionine, D-pantothenic acid, taurine, or thioglycolic acid; limited growth only was obtained with ascorbic acid and dithiothreitol. Homocysteine or coenzyme A was as effective as L-cysteine in stimulating the complete development of oncospheres to cysticercoids. Experiments with 14C-L-cysteine indicated that L-cysteine was perhaps incorporated into the organisms.
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology; D002589:Cestoda / Q000254:growth & development*; D003065:Coenzyme A / Q000494:pharmacology; D003545:Cysteine / Q000494:pharmacology*; D004357:Drug Synergism; D006926:Hymenolepis / Q000187:drug effects / Q000254:growth & development*; D009584:Nitrogen / Q000494:pharmacology*; D010205:Pantothenic Acid / Q000494:pharmacology
chemical_list: D010205:Pantothenic Acid; D003545:Cysteine; D009584:Nitrogen; D001205:Ascorbic Acid; D003065:Coenzyme A