Type

Journal Article

Authors

P Newsholme
C Murphy

Subjects

Pharmacology

Topics
male monocytes interleukin 8 biosynthesis pharmacology antagonists inhibitors animals glutaminase mice cells cultured enzyme inhibitors extracellular space lipopolysaccharides islets of langerhans cell line drug effects humans mice inbred strains mycobacterium bovis diazooxonorleucine macrophage activation coculture techniques glutamine macrophages peritoneal metabolism tumor necrosis factor alpha

Macrophage-mediated lysis of a beta-cell line, tumour necrosis factor-alpha release from bacillus Calmette-Guérin (BCG)-activated murine macrophages and interleukin-8 release from human monocytes are dependent on extracellular glutamine concentration and glutamine metabolism. (1998)

Abstract Macrophages and monocytes are cells with a large capacity for cytokine production. Cytokines produced by these cells are not preformed and released upon stimulation, but must be transcribed and translated. Although much is known concerning the regulation of the latter processes at the molecular level, the role of exogenous amino acids in the secretory process has not been actively investigated. Glutamine is utilized by macrophages at a much faster rate than any other amino acid. The role for high rates of glutamine utilization in macrophages or monocytes is not fully understood. We demonstrate here that the rates of lipopolysaccharide-stimulated tumour necrosis factor-alpha secretion from bacillus Calmette-Guérin (BCG)-activated murine peritoneal macrophages and lipopolysaccharide-stimulated interleukin-8 production from human monocytes are dependent upon extracellular glutamine concentration. We also demonstrate that potent inhibition of cytokine production can be achieved by incubating macrophages or monocytes in the presence of the glutaminase inhibitor 6-diazo-5-oxo-norleucine. On co-culture of BCG-activated macrophages and the clonal pancreatic beta-cell line BRIN-BD11, macrophage-specific beta-cell death was significantly reduced on prior exposure of macrophages to 6-diazo-5-oxo-norleucine. Thus glutamine metabolism may be essential for generation of cytotoxic products from macrophages, including tumour necrosis factor-alpha.
Collections Ireland -> University College Dublin -> PubMed

Full list of authors on original publication

P Newsholme, C Murphy

Experts in our system

1
Philip Newsholme
University College Dublin
Total Publications: 51
 
2
Cormac D. Murphy
University College Dublin
Total Publications: 74