Pakistan J
نویسندگان
چکیده
To further elucidate the possible involvement of intracellular protein catabolism in the development of insecticide resistance, we determined in vivo effect of the potent synthetic pyrethroid, ß-cyfluthrin on the activities of cytoplasmic and lysosomal proteolytic enzymes in insecticide-resistant and susceptible strain of housefly, Musca domestica. ß-Cyfluthrin at LC50 dose after 48 hour treatment decreased all cytoplasmic and lysosomal proteases in living (ranging from 15 to 87%) and dead flies (ranging from 17 to 88%) of susceptible strain except proline endopeptidase, which increased. ß-cyfluthrin also considerably inhibited all proteases of both live (ranging from 20 to 70 %) and dead flies (ranging from 53 to 77%) of resistant strain. Higher level of inhibition of all proteases of resistant strain by ß-cyfluthrin revealed efficacy of the insecticide to control resistant strain effectively, as well as possible involvement of proteases in the development of insect resistance to insecticides.
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