Recent Progress in Juvenile Hormone Analogs (JHA) Research

Parthasarathy, R.; Farkas, Róbert; Palli, Subba Reddy

doi:10.1016/b978-0-12-391500-9.00005-x

Cited by 38 publications

(29 citation statements)

References 260 publications

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“…Juvenile hormones (JHs) are a group of acyclic sesquiterpenoids that exert pleiotropic functions during insect metamorphosis (Ramaseshadri et al, 2012). Juvenile hormones (JHs) are a group of acyclic sesquiterpenoids that exert pleiotropic functions during insect metamorphosis (Ramaseshadri et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Effect of juvenile hormone and pyriproxyfen treatments on the production ofSpodoptera lituranuclear polyhedrosis virus

Liao

Kuo

Shih

et al. 2016

Entomologia Exp Applicata

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Efficient production is essential for developing baculoviruses into marketable bioinsecticides. In this study, we evaluated how juvenile hormone (JH) III and the JH analog pyriproxyfen affected the production efficiency of Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae) Nucleopolyhedrovirus (SpltNPV) in SpltNPV-inoculated early sixth instars. Both the JH III and pyriproxyfen treatments significantly enhanced the body size and weight of S. litura, which resulted in a 1.5-to 2-fold increase in the production of occlusion bodies (OBs). The OBs obtained from JH-and pyriproxyfen-treated larvae were as pathogenic as those produced in untreated larvae. More importantly, JH-or pyriproxy-fen-treated larvae consumed less than twice the amount of food consumed by two untreated larvae. These results indicate that JH and pyriproxyfen treatments improve the production efficiency of SpltNPV in S. litura. SpltNPV infection affected the development of S. litura not only as larvae, but also during subsequent growth stages and generations.

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Section: Introductionmentioning

confidence: 99%

Effect of juvenile hormone and pyriproxyfen treatments on the production ofSpodoptera lituranuclear polyhedrosis virus

Liao

Kuo

Shih

et al. 2016

Entomologia Exp Applicata

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“…Manipulation of JH titer is one of the most common methods employed to understand its mode of action and functions in insects (Sláma, 1971;Howard and Haverty, 1979;Ramaseshadri et al, 2012). The existence of several analogs to JH that both mimic the hormone action and are more stable than the hormone has facilitated experimentation aimed at understanding its function (Robinson, 1985;Robinson and Ratnieks, 1987;Schulz et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Precocene-I inhibits juvenile hormone biosynthesis, ovarian activation, aggression and alters sterility signal production in bumble bee (Bombus terrestris) workers

Amsalem

Teal

Grozinger

et al. 2014

Journal of Experimental Biology

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Juvenile hormone (JH) is an important regulator of development and physiology in insects. While in many insect species, including bumble bees, JH functions as gonadotropin in adults, in some highly eusocial insects its role has shifted to regulate social behavior including division of labor, dominance and aggression. Studying JH functions across social insect species is important for understanding the evolution of sociality; however, these studies have been limited because of the inability to reduce JH levels without surgically removing its glandular source, the corpora allata. Precocene is known to inhibit JH biosynthesis in several non-social insects, but has been poorly studied in social insects. Here, we tested whether precocene-I can effectively reduce JH levels in Bombus terrestris workers, and examined its effects on their physiology and behavior. Precocene-I treatment of three-worker groups decreased JH titer and ovarian activation, irrespective of the bees' dominance rank within the group, and was remedied by JH replacement therapy. Precocene-I also decreased aggressiveness and increased ester-sterility signal production; these changes were rank-dependent, and affected mainly the most reproductive and the least aggressive workers, respectively, and could not be remedied by JH replacement therapy. These results clearly confirm the role of JH as a gonadotropin and mediator of aggression in B. terrestris, and indicate that JH effects are associated with worker dominance rank. The ability to chemically reduce JH titer provides us with a non-intrusive method to probe the evolutionary changes associated with JH and the hormonal mechanisms that are associated with reproduction and behavior in social insects.

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“…Males treated with two applications of either JHA in the fall have lower behavioural and EAG responses than males treated with only one application. Both JHAs have high activity in insects and are commonly used in endocrine experiments (Ramaseshadri et al, 2012). In this study, there is a decrease in pheromone response after moths receive multiple JHA applications.…”

Section: Discussionmentioning

confidence: 80%

“…Juvenile hormone analogues including methoprene and pyriproxyfen act either by preventing JH degradation or as JH agonists (Ramaseshadri et al, 2012). Male C. fraxinella tested up to 9 days post-JHA treatment had a similar, enhanced behavioural response to pheromone in the fall.…”

Section: Discussionmentioning

confidence: 98%

“…Male C. fraxinella tested up to 9 days post-JHA treatment had a similar, enhanced behavioural response to pheromone in the fall. In the absence of endogenous JH, JHAs can act as a hormone replacement, which can lead to long-term effects after only one application (Ramaseshadri et al, 2012). After exogenous application, JHAs bind to JH-binding proteins and prevent the degradation of JH by forming a JHA-protein complex that protects the JHA from natural degrading enzymes present in the haemolymph (Gilbert et al, 2000;Ramaseshadri et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

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The roles of juvenile hormone and biogenic amines on pheromone response plasticity and diapause termination in male Caloptilia fraxinella

Lemmen

Evenden

2016

Entomologia Exp Applicata

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In insects that exhibit a period of delayed reproduction, the timing of mating and reproduction is controlled by environmental conditions that regulate endogenous factors such as hormones and biogenic amines (BAs). Caloptilia fraxinella (Ely) (Lepidoptera: Gracillariidae) undergoes a 9-month reproductive diapause from adult eclosion in the summer until diapause termination the following spring when adults mate. Male response to female sex pheromone is plastic, and is most acute when moths are reproductively active. The aim of this study is to further elucidate the mechanisms involved in the regulation of male response to pheromone in C. fraxinella, and to test whether the application of BAs with and without a juvenile hormone analogue (JHA) to males in different physiological states impacts pheromone responsiveness, as measured by electroantennogram and wind tunnel bioassays. Treatment of male C. fraxinella in reproductive diapause with one application of a JHA induces the highest subsequent pheromone response in the fall, but does not alter pheromone response earlier in reproductive diapause in the summer. The JHAs methoprene and pyriproxyfen similarly enhance pheromone response in the fall. Treatment with methoprene alone or in combination with one of the BAs octopamine, dopamine or serotonin increases male pheromone responsiveness in the fall. The increase in pheromone response can be attributed to methoprene only, as treatment with any of the BAs alone does not enhance male response to pheromone. Biogenic amine treatment lowers male responsiveness to pheromone in some experiments, indicating that there may be a role for BAs in maintaining low pheromone response during reproductive diapause in this species.

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Recent Progress in Juvenile Hormone Analogs (JHA) Research

Cited by 38 publications

References 260 publications

Effect of juvenile hormone and pyriproxyfen treatments on the production ofSpodoptera lituranuclear polyhedrosis virus

Effect of juvenile hormone and pyriproxyfen treatments on the production ofSpodoptera lituranuclear polyhedrosis virus

Precocene-I inhibits juvenile hormone biosynthesis, ovarian activation, aggression and alters sterility signal production in bumble bee (Bombus terrestris) workers

The roles of juvenile hormone and biogenic amines on pheromone response plasticity and diapause termination in male Caloptilia fraxinella

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