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- W1991696188 abstract "Adult female wasps of species in the subfamily Cheloninae inject an egg, venom, polydnavirus and other materials into the host egg during oviposition. Hosts then exhibit precocious expression of the metamorphic developmental program, but then further development by the precocious prepupa is suppressed. These effects occur in truly parasitized hosts (those that contain a live endoparasite larva) as well as in pseudoparasitized hosts (that do not contain a live endoparasite). We report here that during the precocious prepupal stage, the hexamerins BJHSP1 and BJHSP2 persist in the hemolymph of pseudoparasitized hosts, whereas in normal larvae these proteins are cleared from the hemolymph in response to the normal surge in prepupal ecdysteroids. Northern blot analysis of poly(A) RNA showed that the basis for this persistence is not an abnormally high abundance of the transcripts on the day following wandering in pseudoparasitized larvae. Nor is the source of the hexamerins the parasite larva, for it is missing from the pseudoparasitized hosts. The hypothesis that the persistence is due to a suppressed titer of ecdysteroids in pseudoparasitized hosts (reported earlier: [jones et al., Arch Insect Biochem Physiol 21:155 (1992)] was tested by use of a large size variant of pseudoparasitized hosts in which the prepupal ecdysteroid titer is partially restored by endogenous ecdysteroid production. In such pseudoparasitized prepupae, the two hexamerins were cleared from the hemolymph on the day following host wandering behavior, as in normal larvae. Thus, the regulatory basis of the persistence of the hexamerins BJHSP1 and BJHSP2 in the hemolymph of pseudoparasitized hosts appears to be at the posttranslational level, with suppression of the prepupal ecdysteroid titer causing omission of the normal trigger for fat body uptake of the hexamerins." @default.
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- W1991696188 date "1996-01-01" @default.
- W1991696188 modified "2023-10-16" @default.
- W1991696188 title "Altered hexamerin regulation in prepupalTrichoplusia ni pseudoparasitized byChelonus sp. nearCurvimaculatus" @default.
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- W1991696188 doi "https://doi.org/10.1002/(sici)1520-6327(1996)32:3/4<537::aid-arch25>3.0.co;2-c" @default.
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