title: Inhibitors of protein kinase C block activation of B lymphocytes by bacterial lipopolysaccharide.
abstract: Activation of murine splenic B lymphocytes (B cells) by bacterial lipopolysaccharide (LPS) was found to be markedly inhibited by 1-(5-isoquinolinylsulfonyl)-2-methylpiperazine (H-7) and N-[2-(methylamino)ethyl]-5-isoquinolinesulfonamide (H-8), two potent inhibitors of protein kinases. The higher sensitivity of DNA synthesis, RNA synthesis and protein N-glycosylation activity to H-7, relative to H-8, strongly supports the proposal that protein kinase C plays a critical role in the activation of B cells. A kinetic study on the time of addition of H-7 indicated that protein kinase C promoted the activation process continuously after the addition of LPS.
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000818:Animals; D001402:B-Lymphocytes / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism; D002478:Cells, Cultured; D004261:DNA Replication / Q000187:drug effects; D005260:Female; D007546:Isoquinolines / Q000494:pharmacology*; D007700:Kinetics; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008213:Lymphocyte Activation / Q000187:drug effects*; D051379:Mice; D008811:Mice, Inbred DBA; D010879:Piperazines / Q000494:pharmacology*; D011493:Protein Kinase C / Q000037:antagonists & inhibitors*; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D007546:Isoquinolines; D008070:Lipopolysaccharides; D010879:Piperazines; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; C053177:N-(2-(methylamino)ethyl)-5-isoquinolinesulfonamide; D011493:Protein Kinase C