PMID- 3778661 OWN - NLM STAT- MEDLINE DCOM- 19870106 LR - 20190912 IS - 0829-8211 (Print) IS - 0829-8211 (Linking) VI - 64 IP - 9 DP - 1986 Sep TI - Characterization of lithium-induced enzyme release from human polymorphonuclear leukocytes. PG - 880-5 AB - Lysozyme release from purified human polymorphonuclear leukocytes was found to be uniquely enhanced by 2.5-20 mM LiCl. This effect was dose dependent and was not detected when the media was supplemented with NaCl, KCl, MgCl2, or CaCl2. The purified isotopes of Li+, 6Li, and 7Li were equally effective in enhancing lysozyme release from the cells at 10 and 20 mM, but 6Li was more effective than 7Li at 5 mM. The enhancement of enzyme release in the presence of Li+ was comparable to the enhancement observed in the presence of N-formylmethionylleucylphenylalanine (fMLP). Addition of LiCl plus fMLP did not result in lysozyme release in excess of each stimulant alone, except when the cells were incubated with 20 mM 6Li + 10(-5) M fMLP. In addition, enzyme release induced by these two agents could be further enhanced to the same degree by addition of cytochalasin D to the incubation mixtures. While similarities between enzyme release induced by LiCl and fMLP were detected, optimal stimulation of enzyme release by Li+ was much more sensitive to inhibition by pertussis toxin than was maximal fMLP stimulation. Therefore, the intracellular events altered by Li+ and the peptide may share some metabolic steps, but they differ in their sensitivity to alterations in cAMP metabolism. FAU - Hart, D A AU - Hart DA FAU - Groenewoud, Y AU - Groenewoud Y FAU - Chamberland, S AU - Chamberland S LA - eng PT - Comparative Study PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - Canada TA - Biochem Cell Biol JT - Biochemistry and cell biology = Biochimie et biologie cellulaire JID - 8606068 RN - 0 (Virulence Factors, Bordetella) RN - 59880-97-6 (N-Formylmethionine Leucyl-Phenylalanine) RN - 9FN79X2M3F (Lithium) RN - EC 2.4.2.31 (Pertussis Toxin) RN - EC 3.2.1.17 (Muramidase) SB - IM MH - Enzyme Activation/drug effects MH - Humans MH - Lithium/*pharmacology MH - Muramidase/*metabolism MH - N-Formylmethionine Leucyl-Phenylalanine/pharmacology MH - Neutrophils/*enzymology MH - Pertussis Toxin MH - Virulence Factors, Bordetella/pharmacology EDAT- 1986/09/01 00:00 MHDA- 1986/09/01 00:01 CRDT- 1986/09/01 00:00 PHST- 1986/09/01 00:00 [pubmed] PHST- 1986/09/01 00:01 [medline] PHST- 1986/09/01 00:00 [entrez] AID - 10.1139/o86-117 [doi] PST - ppublish SO - Biochem Cell Biol. 1986 Sep;64(9):880-5. doi: 10.1139/o86-117.