Phorbol Myristate Acetate-Induced Macrophage Aggregation

Pathobiology ◽  
1983 ◽  
Vol 51 (1) ◽  
pp. 39-43 ◽  
Author(s):  
P. Badenoch-Jones
FEBS Letters ◽  
1986 ◽  
Vol 204 (2) ◽  
pp. 341-346 ◽  
Author(s):  
Stephen P. Halenda ◽  
Mario Volpi ◽  
George B. Zavoico ◽  
Ramadan I. Sha'afi ◽  
Maurice B. Feinstein

1982 ◽  
Vol 60 (11) ◽  
pp. 1359-1366 ◽  
Author(s):  
H. C. Birnboim

We have recently reported that phorbol myristate acetate (PMA) induces extensive DNA strand break damage in human peripheral blood leukocytes. The mechanism of action involves superoxide anion and hydrogen peroxide which are generated by phagocytes during the "respiratory burst." In this report, we describe the effect of various inhibitors and scavengers on PMA-induced DNA damage. Azide and cyanide greatly increased the level of damage; sulfhydryl compounds (glutathione, cysteine, and cysteamine) and ascorbate markedly decreased the level of damage. Hydroxyl radical scavengers such as dimethyl sulfoxide (DMSO) and glycerol also decreased the level of damage but apparently did so by inhibiting the respiratory burst. Diethyldithiocarbamate (DDC) increased the level of DNA damage at low concentrations (<1 mM), but decreased DNA damage at ≥1 mM. The results are consistent with a mechanism involving superoxide anion and hydrogen peroxide, but the precise reaction (free radical or enzymatic) responsible for DNA strand breakage has not been determined. The PMA-stimulated phagocyte is an interesting model system for looking at "active oxygen" mediated DNA damage and factors which influence it.


Sign in / Sign up

Export Citation Format

Share Document