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  1. Comparative inhibition of enzymes of human erythrocytes and plasma in vitro by agricultural chemicals.

    Article - En anglais

    Farm workers generally are exposed to a combination of synthetic agricultural chemicals and natural products while working in the fields.

    These biologically active compounds control infestation of tobacco by insects, and plant growth.

    We have investigated, in vitro, the effects of acephate (AP), cadmium (Cd), methamidophos (MAP), maleic hydrazide (MH), and nicotine (NI) on the activities of the erythrocyte enzymes delta-aminolevulinic acid dehydratase (ALAD), superoxide dismutase (SOD), and plasma cholinesterase (CHE).

    ALAD, SOD, and plasma CHE were assayed, using aminolevulinic acid, pyrogallol, or butyryl thiocholine as substrates, respectively.

    Different concentrations of the above chemicals were used to obtain minimum and maximum inhibition of the enzymes, and for the development of inhibition dose response curves.

    These curves were used to determine the concentration of each chemical required to inhibit 50% of enzyme activity (I50).

    The I50, concentrations of various chemicals for each enzyme were determined in mM for ALAD :

    • AP=95.5,

    • Cd=1.4 X 10-3,

    • MH=2.8,

    • MAP=7.1,

    • NI=60.8 ;

    • for SOD : AP=1.2,

    • Cd=0.8 X 10-7,

    • MH=0.04,

    • MAP=0.42,

    • NI=0.81 ;

    • for CHE : AP=5.6,

    • Cd=18.8 X 10-5,

    • MAP=18.4 X 10-4 ;

    • CHE was not inhibited by MH and NI.

    Our data indicate that AP inhibited both SOD and CHE to a maximum of 91 and 87%, while MH inhibited both SOD and ALAD to a maximum 78 and 90%. (...)

    Mots-clés Pascal : Agriculteur, Exposition professionnelle, Médecine travail, Homme, Pesticide, Association toxique, Interaction toxique, Activité enzymatique, Marqueur biologique, In vitro, Porphobilinogen synthase, Hydro-lyases, Carbon-oxygen lyases, Lyases, Enzyme, Superoxide dismutase, Oxidoreductases, Cholinesterase, Carboxylic ester hydrolases, Esterases, Hydrolases, Erythrocyte, Plasma sanguin

    Mots-clés Pascal anglais : Farmer, Occupational exposure, Occupational medicine, Human, Pesticides, Toxic association, Poison interaction, Enzymatic activity, Biological marker, In vitro, Porphobilinogen synthase, Hydro-lyases, Carbon-oxygen lyases, Lyases, Enzyme, Superoxide dismutase, Oxidoreductases, Cholinesterase, Carboxylic ester hydrolases, Esterases, Hydrolases, Red blood cell, Blood plasma

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 96-0436388

    Code Inist : 002B03G. Création : 10/04/1997.