Regulation of juvenile hormone titer in African locust
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In the African locust, the titer of C-16 JH in hemolymph (determined by GC-MS), reflects the rate of hormone biosynthesis (determined by RCA) in normal adult females. Severance of the nervi corporis allati-I (NCA-I) results in a low C-16 JH biosynthesis without affecting physiological events dependent on JH. In NCA-I-transectioned animals, JH titer is higher than in control locusts. JH catabolism does not seem to be involved in this high titer of hormone associated with a very low rate of JH production. In sham-operated females, the bulk of injected [3H]C-16 JH quickly disappeared from the hemolymph but JH was retained in the bloodless body. After severance of the NCA-I, the remaining radiolabeled JH in the hemolymph increased. These results suggest the role of tissue JH-binding or of JH excretion in regulating its level in the locust.
Key wordsJuvenile hormone biosynthesis catabolism tissue binding titer disconnected copora allata, locust
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