Lipopolysaccharide-, granulocyte-monocyte colony stimulating factor and pentoxifylline-mediated effects on formyl-methionyl-leucine-phenylalanine-stimulated neutrophil respiratory burst in the elderly.
The impairment of superoxide anion (O2-) generation by aged polymorphonuclear cells (PMN) stimulated with formyl-methionyl-leucine-phenylalanine (FMLP) has been reported. In this work the effect of lipopolysaccharide (LPS), granulocyte-macrophage colony stimulating factor (GM-CSF) and pentoxifylline (POF) pretreatment on FMLP-triggered neutrophil oxidative metabolism in a group of healthy elderly individuals, was investigated. Results provide evidence that LPS and/or GM-CSF priming was able to enhance O2- production in old PMN, even if values were still lower than those observed in similarly-treated young cells. Moreover, even if the lag period was unaffected by inflammatory mediator treatment, the priming gave rise to a significant increase of maximum O2- release rate. On the contrary, POF pretreatment led to a significant decrease of oxidative responsiveness in either unprimed or primed PMN suspensions. These findings suggest the occurrence of different mechanisms in the imbalance of FMLP-activated neutrophil oxidative responsiveness during senescence. This may be of paramount significance for explaining the augmented frequency of severe infectious diseases with advancing age.
Tortorella
C
C
Department of Internal Medicine, Immunology and Infectious Diseases, University of Bari Medical Faculty, Policlinico, Italy.
Polignano
A
A
Piazzolla
G
G
Serrone
M
M
Jirillo
E
E
Antonaci
S
S
D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000276:immunology*; D002478:Cells, Cultured; D005260:Female; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D006801:Humans; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008297:Male; D008875:Middle Aged; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000276:immunology; D009504:Neutrophils / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism; D010431:Pentoxifylline / Q000494:pharmacology*; D016897:Respiratory Burst; D013481:Superoxides / Q000378:metabolism
D008070:Lipopolysaccharides; D013481:Superoxides; D009240:N-Formylmethionine Leucyl-Phenylalanine; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D010431:Pentoxifylline