Human Polymorphonuclear Leukocyte Chemotaxis as a Tool in Detecting Biological Early Effects in Workers Occupationally Exposed to Low Levels of n-HeXane
Restricted accessResearch articleFirst published online October, 1994
Human Polymorphonuclear Leukocyte Chemotaxis as a Tool in Detecting Biological Early Effects in Workers Occupationally Exposed to Low Levels of n-HeXane
Human polymorphonuclear leukocytes (PMN) were chosen to measure two cellular end points- chemotaxis and respiratory burst - and to verify whether they could function as biomarkers of early effect in detecting occupational exposure to n-hexane of apparently healthy shoe workers, without any electroneuromyographic (ENMG) abnormality.
Chemotaxis, but not respiratory burst, was found to be impaired. A negative linear correlation between chemotaxis of PMN of those workers that had been exposed to n-hexane versus 2,5-hexanedione (2,5-HD) urinary concentrations were found.
This negative trend is consistent with our previous in vitro experimental findings: it was observed that the progressive addition of 2,5-HD to PMN suspensions inhibited chemotaxis in a dose-dependent mode, while chemiluminescence was not modified.
Now we have confirmed in vivo that chemotaxis is more sensitive than the respiratory burst response to 2,5-HD. Such results justify the interest in the behaviour of PMN harvested from workers exposed to n-hexane.
Since significant inhibition of chemotactic activity was observed in some workers whose urinary 2,5-HD levels were lower than 5 mg l-1, which is the biological exposure index suggested by ACGIH, this study suggests that PMN chemotaxis may be proposed as a useful biomarker in detecting occupational exposure to low level of n-hexane.
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