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46 results for “Juvenile Hormone”
Data from: "Worker queens"? Behavioral flexibility, juvenile hormone binding protein and Vitellogenin in queens of the little fire ant Wasmannia auropunctata
<p>Many species of social Hymenoptera demonstrate behavioral flexibility, where older workers that typically forage can revert to younger worker tasks, such as nursing, when these are absent. This flexibility is typical of the sterile worker class, yet rare in queens. In the little fire ant (<i>Wasmannia auropunctata</i>) queens have been reported to perform only egg laying. We examined behavior of queens of <i>W. auropunctata</i> after demographic manipulation. When half of the workers were removed from the colony, queens were observed caring for eggs, larvae and pupae as well as eating outside of the nest, like forager workers. We examined the relationship between these atypical queen behaviors and their juvenile hormone binding protein (JHbp) and vitellogenin (Vg) expression via QRT-PCR method. JHbp and Vg expression decreased when queens were performing worker tasks, resembling the expected expression pattern of typical sterile workers. Flexibility in queen behaviors in the little fire ant may be an important adaptation to changing environments. As a significant invasive species, such adaptation may increase the probability of colony survival during propagation. Our results not only present new insights in behavioral flexibility in social insects, but also increases our understanding of the success of this significant invasive species. </p>
Data from: Ecdysteroid hormones link the juvenile environment to alternative adult life histories in a seasonal insect
The conditional expression of alternative life strategies is a widespread feature of animal life and a pivotal adaptation to life in seasonal environments. To optimally match suites of traits to seasonally changing ecological opportunities, animals living in seasonal environments need mechanisms linking information on environmental quality to resource allocation decisions. The butterfly Bicyclus anynana expresses alternative adult life histories in the alternating wet and dry seasons of its habitat as endpoints of divergent developmental pathways triggered by seasonal variation in preadult temperature. Pupal ecdysteroid hormone titers are correlated with the seasonal environment, but whether they play a functional role in coordinating the coupling of adult traits in the alternative life histories is unknown. Here, we show that manipulating pupal ecdysteroid levels is sufficient to mimic in direction and magnitude the shifts in adult reproductive resource allocation normally induced by seasonal temperature. Crucially, this allocation shift is accompanied by changes in ecologically relevant traits, including timing of reproduction, life span, and starvation resistance. Together, our results support a functional role for ecdysteroids during development in mediating strategic reproductive investment decisions in response to predictive indicators of environmental quality. This study provides a physiological mechanism for adaptive developmental plasticity, allowing organisms to cope with variable environments.
Data from: Effect of juvenile hormone on senescence in males with terminal investment
Senescence, a decline in survival and reproductive prospects with age, is controlled by hormones. In insects, juvenile hormone (JH) is involved in senescence with captive individuals, but its effect under natural conditions is unknown. We have addressed this gap by increasing JH levels in young and old wild males of the damselfly Hetaerina americana. We assessed survival in males that were treated with a JH analogue (methoprene), which is known to promote sexual activity, and an immune challenge, which is known to promote terminal investment in reproduction in the studied species. We replicated the same procedure in captivity (to control for environmental variation), where males were deprived of any activity or food. We expected old males to show the lowest survival after being treated with JH and immune-challenged, because the effect of terminal investment on senescence would be exacerbated by JH. However, this should be the case for wild animals, but not for captive animals, as the effects of JH and immune challenge should lead to an increase in high energetic-demanding activities only occurring in the wild. Old animals died sooner compared with young animals in both the wild and captivity, confirming that males are subject to senescence. In wild but not captive animals, JH decreased survival in young males and increased it in old males, confirming that JH is sensitive to the environment when shaping animal senescence. Immune challenge had no effect on survival, suggesting no effect of terminal investment on senescence. Additionally, contrary to the expected effects of terminal investment, with an immune challenge, recapture rates increased in young males and decreased in old males. Our results show that male senescence in the wild is mediated by JH and that terminal investment does not cause senescence. One explanation is that animals undergoing senescence and terminal investment modify their feeding behaviour to compensate for their physiological state.
Data from: Pleiotropic effects of juvenile hormone in ant queens and the escape from the reproduction-immunocompetence trade-off
The ubiquitous trade-off between survival and costly reproduction is one of the most fundamental constraints governing life-history evolution. In numerous animals, gonadotropic hormones antagonistically suppressing immunocompetence cause this trade-off. The queens of many social insects defy the reproduction-survival trade-off, achieving both an extraordinarily long life and high reproductive output, but how they achieve this is unknown. Here we show experimentally, by integrating quantification of gene expression, physiology and behaviour, that the long-lived queens of the ant Lasius niger have escaped the reproduction-immunocompetence trade-off by decoupling the effects of a key endocrine regulator of fertility and immunocompetence in solitary insects, juvenile hormone (JH). This modification of the regulatory architecture enables queens to sustain a high reproductive output without elevated JH titres and suppressed immunocompetence, providing an escape from the reproduction-immunocompetence trade-off that may contribute to the extraordinary lifespan of many social insect queens.
Effects of additional nutrients on carbohydrate, juvenile hormone, and vitellogenin contents in Frankliniella occidentalis (Thysanoptera: Thripidae)
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Juvenile hormone pathway in honey bee larvae: a source of possible signal molecules for the reproductive behavior of Varroa destructor
<p>The parasitic mite <i>Varroa destructor </i>devastates honey bee (<i>Apis mellifera</i>) colonies around the world. Entering a brood cell shortly before capping, the <i>Varroa</i> mother feeds on the honey bee larvae. The hormones 20-hydroxyecdysone (20E) and juvenile hormone (JH), acquired from the host, have been considered to play a key role in initiating <i>Varroa</i>'s reproductive cycle. This study focuses on differential expression of the genes involved in the biosynthesis of JH and ecdysone at 6 time points during the first 30 hours after cell capping in both drone and worker larvae of <i>A. mellifera</i>. This time frame, covering the conclusion of the honey bee brood cell invasion and the start of <i>Varroa</i>'s ovogenesis, is critical to the successful initiation of a reproductive cycle. Our findings support a later activation of the ecdysteroid cascade in honey bee drones compared to worker larvae, which could account for the increased egg production of <i>Varroa</i> in <i>A. mellifera</i> drones. The JH pathway was generally downregulated confirming its activity is antagonistic to the ecdysteroid pathway during the larva development. Nevertheless, the genes involved in JH synthesis revealed an increased expression in drones. The upregulation of <i>jhamt</i> gene involved in methyl farnesoate (MF) synthesis came into attention since the MF is not only a precursor of JH but it is also an insect pheromone in its own right as well as JH-like hormone in Acari. This could indicate a possible kairomone effect of MF for attracting the mites into the drone brood cells, along with its potential involvement in ovogenesis after the cell capping, stimulating <i>Varroa</i>'s initiation of egg laying.</p>
Data from: Pleiotropic effects of juvenile hormone in ant queens and the escape from the reproduction-immunocompetence trade-off
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Data from: Ecdysteroid hormones link the juvenile environment to alternative adult life histories in a seasonal insect
Open the record for dataset details and reuse information.
Data from: “Worker queens”? Behavioral flexibility, juvenile hormone binding protein and Vitellogenin in queens of the little fire ant Wasmannia auropunctata
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Data from: Effect of juvenile hormone on senescence in males with terminal investment
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Juvenile hormone pathway in honey bee larvae: a source of possible signal molecules for the reproductive behavior of Varroa destructor
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RNA m6A methylation suppresses insect juvenile hormone degradation to minimize fitness costs in response to a pathogenic attack
GEO Series GSE247107. Plutella xylostella. 12 samples. Type: Other.
Molecular impact of juvenile hormone agonists on neonatal Daphnia magna
GEO Series GSE47990. Daphnia magna. 30 samples. Type: Expression profiling by array.
Detection of juvenile hormone-like function of diofenolan in Daphnia magna using in vivo short-term screening assay, TG211 Annex 7 reproduction test and microarray analysis
GEO Series GSE53570. Daphnia magna. 8 samples. Type: Expression profiling by array.
Growth Hormone and Exclusion Diet Therapy in Juvenile Crohn's Disease
ClinicalTrials.gov study NCT01647412. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Differentially expressed genes in developing queens and workers - effects of juvenile hormone (JH)
GEO Series GSE6452. Apis mellifera. 10 samples. Type: Expression profiling by array.
Whole body transcriptional response of female fruitflies to juvenile hormone
GEO Series GSE9001. Drosophila melanogaster. 4 samples. Type: Expression profiling by array.
Characterization of Directly Regulated Thyroid Hormone Mediated Gene Expression Following Short-Term Perturbations in Thyroid Hormone Levels in Juvenile Mice
GEO Series GSE21307. Mus musculus. 34 samples. Type: Expression profiling by array.
Juvenile hormone regulation of Drosophila aging
GEO Series GSE48145. Drosophila melanogaster. 12 samples. Type: Expression profiling by array.
Comparative ovarian microarray analysis of juvenile hormone-responsive genes in water flea Daphnia magna
GEO Series GSE81083. Daphnia magna. 16 samples. Type: Expression profiling by array.
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