In vitro metabolism of juvenile hormone III and juvenile hormone III bisepoxide by Drosophila melanogaster and mammalian cytosolic epoxide hydrolase |
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| Authors: | J Casas L G Harshman A Messeguer E Kuwano B D Hammock |
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| Institution: | Department of Entomology, University of California, Davis 95616. |
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| Abstract: | In vitro metabolism of juvenile hormone III (JH III) and juvenile hormone III bisepoxide was investigated using purified mouse liver cytosolic epoxide hydrolase (cEH) and cell fractions from Drosophila melanogaster. JH III was metabolized faster than JH III bisepoxide by epoxide hydrolase activity in D. melanogaster cell fractions and by cEH. After incubation with JH III bisepoxide, all cell fractions and cEH produced epoxy-diol, cis- and trans-tetrahydrofuran-diols, and tetraol as metabolites. An increase in the concentration of cEH resulted in an increase in the proportion of tetraol as a JH III bisepoxide metabolite but this trend was not observed in the D. melanogaster cell fractions. Differences between cell fractions in the metabolism of JH III and JH III bisepoxide suggests the presence of juvenile hormone epoxide hydrolase isozymes. |
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