title: Imidoester inhibition of lymphocyte DNA synthesis.
abstract: Imidoesters amidinate free amino groups and produce inter- and intramolecular covalent bonds. To determine whether imidoesters influenced lymphocyte transformation, human peripheral blood or calf lymph node lymphocytes were cultured with dimethyladipimate (DMA), a bifunctional (cross-linking) imidoester, or methyl acetimidate (MAC), a monofunctional (noncross-linking) imidoester. Both DMA and MAC decreased the rate of endogenous DNA synthesis in a dose-dependent fashion. In further work, lymphocytes were treated with Phaseolus vulgaris phytohemagglutinin, concanavalin A, or periodate. DMA (1 mM) decreased DNA synthesis in P. vulgaris phytohemagglutinin-stimulated human cells by 65%, Concanavalin A-stimulated cells by 98.2%, and periodate-stimulated cells by 85%. Similar results were obtained with 1 mM MAC. Inhibition by DMA was slightly greater than was the inhibition by MAC. Decreased DNA synthesis resulted if DMA was added to P. vulgaris phytohemagglutinin-stimulated human lymphocytes at initiation of culture (72%) or after 16 hr (75%); inhibition was less when DMA was added after 24 hr (43%) and was not apparent if added after 48 hr. Therefore, both monofunctional and bifunctional imidoesters inhibit endogenous and stimulated DNA synthesis in human and calf lymphocytes.
mesh_terms: D002478:Cells, Cultured; D003208:Concanavalin A / Q000494:pharmacology; D004247:DNA / Q000096:biosynthesis*; D004119:Dimethyl Adipimidate / Q000494:pharmacology; D007094:Imides / Q000494:pharmacology*; D008213:Lymphocyte Activation / Q000187:drug effects; D008214:Lymphocytes / Q000187:drug effects* / Q000378:metabolism; D010504:Periodic Acid / Q000494:pharmacology; D010835:Phytohemagglutinins / Q000494:pharmacology
chemical_list: D007094:Imides; D010835:Phytohemagglutinins; D010504:Periodic Acid; D003208:Concanavalin A; D004119:Dimethyl Adipimidate; D004247:DNA