Mechanisms of resistance to the juvenoid methoprene in the house fly Musca domestica L

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Abstract

The mechanisms of resistance and cross resistance to the juvenoids methoprene and R-20458 in the house fly, Musca domestica, were examined. Radiolabeled methoprene was found to be metabolized faster in resistant and cross-resistant house fly larvae than in susceptible larvae, and methoprene and R-20458 penetrated more slowly into larvae of the resistant strain. In vivo and in vitro metabolism of methoprene was largely by oxidative pathways followed by conjugation in all strains examined, and little or no ester change of methoprene was noted in vitro. In vitro oxidative metabolism of methoprene, R-20458, juvenile hormone I, and several model substrates was higher in resistant and cross-resistant larvae than in susceptible larvae. Juvenoid functionalities susceptible to metabolic attack by resistant strains are indicated. © 1977.

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Hammock, B. D., Mumby, S. M., & Lee, P. W. (1977). Mechanisms of resistance to the juvenoid methoprene in the house fly Musca domestica L. Pesticide Biochemistry and Physiology, 7(3), 261–272. https://doi.org/10.1016/0048-3575(77)90017-7

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