The effects of 2,3,7,8-tetrachloro-dibenzo-p-dioxin on human polymorphonuclear leucocytes.
Suspensions of human polymorphonuclear leucocytes were treated with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) at concentrations 10(-8), 10(-7), 10(-6) and 10(-5) M. The TCDD provoked a progressive extracellular release of the lysosomal enzyme beta-N-acetylglucosaminidase and the cytoplasmic enzyme lactate dehydrogenase in a dose-dependent fashion. At all concentrations TCDD was much more effective in releasing beta-N-acetylglucosaminidase than lactate dehydrogenase. Different responses of the two enzymes to TCDD might be explained by differential structural affinities of beta-N-acetylglucosaminidase for the lysosomal membrane and of lactate dehydrogenase for the cytoplasm. It is likely that TCDD affected the solubility of beta-N-acetylglucosaminidase to a higher extent than that of lactate dehydrogenase, which is probably firmly attached to the cytoplasm.
Croatian National Electricity, Zagreb.
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D006801:Humans; D009504:Neutrophils / Q000187:drug effects* / Q000201:enzymology; D000072317:Polychlorinated Dibenzodioxins / Q000494:pharmacology*
D000072317:Polychlorinated Dibenzodioxins