The Role of Juvenile Hormone in Reproduction

Koeppe, John K.; Fuchs, Morton S.; Chen, Thomas T.; Hunt, Linda-Margaret; Kovalick, Gae E.; Briers, T.

doi:10.1016/b978-0-08-030809-8.50012-5

Cited by 87 publications

(72 citation statements)

References 188 publications

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“…ß-glycosidases are enzymes that are involved in the cleavage of the ß-1, 4-linked monosaccharide residues of glycosides (Terra & Ferreira, 1994). ß-glucosidase and ß-mannosidase activity have been detected in insect midguts (Ferreira et al, 1998;Scrivener et al, 1997), while ß-glucosidases are also present in the colleterial glands (Koeppe et al, 1985) and in the hemolymph (Franzl et al, 1989) of various insect species. Although once thought to be restricted to microorganisms, endogenous cellulase transcripts have been isolated in a diverse range of animal species (review, Watanabe & Tokuda, 2001).…”

Section: Discussionmentioning

confidence: 99%

Down-regulation of gene expression between the diapause initiation and maintenance phases of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)

Yocum¹,

Rinehart²,

Larson³

2009

Eur. J. Entomol.

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Abstract. The diapause initiation and maintenance phases of the Colorado potato beetle, Leptinotarsa decemlineata, were screened. Eight transcripts were found to be downregulated as the beetles enter the diapause maintenance phase of diapause development after day 15 postemergence. These transcripts were also expressed in early nondiapausing adults. Using BlastX, the transcripts were placed into six broad categories: regulatory (serpin), structural (apidermin), protease (serine protease), retinol binding protein (CRALBP), carbohydrate metabolism (ß-glucosidase, ß-mannosidase, and cellulose II), and unknown function.

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Section: Discussionmentioning

confidence: 99%

Down-regulation of gene expression between the diapause initiation and maintenance phases of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)

Yocum¹,

Rinehart²,

Larson³

2009

Eur. J. Entomol.

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“…Nevertheless, the physiologically relevant roles of MF have not yet been unequivocally defined. By analogy to the established roles of JH III in insect reproduction (11,12), and in an attempt to unify common themes in arthropod endocrinology, it has been suggested that MF has a key role in reproduction (13). MF biosynthesis and circulating titer have been shown to be positively correlated with ovarian maturation in some crustaceans (3,14), and morphological changes in ovarian follicle cells reminiscent of JHstimulated patency in insects (15), have been observed in crustaceans following injection of JH mimics (16).…”

Section: It Is Established That the Mandibular Organs (Mo)mentioning

confidence: 99%

Structure and Significance of Mandibular Organ-inhibiting Hormone in the Crab, Cancer pagurus

Wainwright

Webster

Wilkinson

et al. 1996

Journal of Biological Chemistry

165

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Current evidence indicates that methyl farnesoate is the crustacean equivalent of the juvenile hormones of insects. This putative hormone is produced by the mandibular organs and is negatively regulated by a neuropeptide produced and secreted by the X-organ-sinus gland complex of the eyestalk. To identify this neuropeptide, a bioassay was developed which measures the inhibition of methyl farnesoate synthesis by mandibular organs exposed to fractionated sinus gland extracts from the crab, Cancer pagurus. Two neuropeptides, named mandibular organ-inhibiting hormones (MOIH-1 and -2) repressed methyl farnesoate synthesis. MOIH-1 was fully sequenced by automated Edman degradation of endoproteinase-derived fragments and further characterized by mass spectrometry. This peptide consisted of 78 residues (M r 9235.6), with unblocked termini and three intrachain disulfide bridges. MOIH-2 appeared to be almost identical to MOIH-1 with the exception of a Gln for Lys substitution at position 33. Comparison with previously sequenced crustacean neuropeptides shows that these MOIHs are members of the ever expanding crustacean hyperglycemic hormone family, with significant sequence similarity to molt-inhibiting hormones (MIHs). It is possible that these two structurally similar peptides (MIH, MOIH) may control mutually exclusive physiological phenomena (somatic and gonadal growth), suggesting a complex hormonal integration of these processes in crustaceans.

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“…Juvenile hormones are involved in the synthesis and uptake of vitellogenin in adult female insects (Davey et al, 1993;Glinka & Wyatt, 1996;Tufail et al, 2014), and their levels vary according to the oviposition cycle (Wyatt & Davey, 1996;Borst et al, 2000). Juvenile hormone levels in many insect species are directly correlated with ovarian mass and stage of ovarian development (Koeppe et al, 1985;Okuda & Chinzei, 1988).…”

Section: Discussionmentioning

confidence: 99%

Mating alters the rate of development of ovarioles in the ladybird, Propylea dissecta (Coleoptera: Coccinellidae)

Shahid¹,

Siddiqui²,

Omkar³

et al. 2016

Eur. J. Entomol.

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The Role of Juvenile Hormone in Reproduction

Cited by 87 publications

References 188 publications

Down-regulation of gene expression between the diapause initiation and maintenance phases of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)

Down-regulation of gene expression between the diapause initiation and maintenance phases of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)

Structure and Significance of Mandibular Organ-inhibiting Hormone in the Crab, Cancer pagurus

Mating alters the rate of development of ovarioles in the ladybird, Propylea dissecta (Coleoptera: Coccinellidae)

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