Influence of development and prothoracicotropic hormone on the ecdysteroids produced in vitro by the prothoracic glands of female gypsy moth (Lymantria dispar) pupae and pharate adults

Fescemyer, Howard W.; Masler, Edward P.; Kelly, Thomas J.; Lusby, William R.

doi:10.1016/0022-1910(94)00132-z

Cited by 6 publications

(2 citation statements)

References 36 publications

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“…Ecdysteroids are produced by the prothoracic glands in immature insects. In most insects these glands secrete ecdysone, but some larval Lepidoptera are also known to secrete 3-dehydroecdysone which is converted to ecdysone by enzymes in the hemolymph (Fescemeyer et al 1995;Gilbert 2002). Ecdysone is a prohormone, it is converted to the active hormone, 20-hydroxyecdysone (20E), in the fat body or epidermis by a cytochrome P-450 enzyme.…”

Section: Brief Description Of the Insect Hormone Systemmentioning

confidence: 99%

Endocrine disruption in aquatic insects: a review

Soin

Smagghe

2007

Ecotoxicology

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There is mounting evidence that a wide variety of compounds can have endocrine disrupting effects on humans and wildlife. However, investigations so far have focused primarily on exposure to human and other vertebrates, with invertebrate findings largely restricted to marine mollusks or to the ecdysteroid and juvenile hormone agonists as purposely synthesized endocrine disrupters for the pest management of insects. This article provides a brief description of the insect hormone system, a short sum-up of the relevant insect groups with aquatic life stages, and an overview of the additional evidence for endocrine disruption in aquatic insects from laboratory and field studies since 1999. In addition, the suitability of insects as sentinels for endocrine disrupting chemicals in aquatic ecosystems is discussed. Conclusions are drawn and research needs are defined.

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Section: Brief Description Of the Insect Hormone Systemmentioning

confidence: 99%

Endocrine disruption in aquatic insects: a review

Soin

Smagghe

2007

Ecotoxicology

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“…The large form of the PTTH has a tropic effect on the prothoracic gland by inducing the synthesis of ecdysone (Kelly et al, 1986;Fescemyer et al, 1995). Exogenous and endogenous factors that change the activity of neu rosecretory neurons, and their number, also change the neurohormonal balance and thus the dynamics of insect development (Ivanovic et al, 1989;.…”

Section: Introductionmentioning

confidence: 99%

A possible role for the dorsolateral protocerebral neurosecretory neurons in the trophic adaptations of Lymantria dispar (Lepidoptera: Lymantriidae)

Perić-Mataruga¹,

Lazarević²,

Nenadovic³

2001

Eur. J. Entomol.

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Abstract. The activity and number of protocerebral neurosecretory neurons ofthe dorsolateral group (L1, L2 and L2'), as well as the size of the corpora allata were investigated in 5th instar larvae of the gypsy moth (Lymantria dispar) from two populations (oak and locust-tree forests) fed one of two host-plants (oak is a suitable and locust-tree an unsuitable host-plant).The monitoring of activity related cytological parameters and the number of protocerebral dorsolateral neurosecretory neurons revealed that differently adapted populations respond to nutritive stress differently. The activity of the L1 neurosecretory neurons in the protocerebra of the caterpillars is low in those from the locust-tree forest regardless of host-plant quality. The L2 neurosecretory neurons in the oak population become active when they were fed the unsuitable host-plant whereas their activity was high in locusttree caterpillars regardless of the host-plant. A decrease in the number of neurosecretory neurons in a response to a novel food was noticed in both populations. The activity of the L2' neurosecretory neurons was similar in all caterpillars, but their number was increased in those from the locust-tree forest. The corpora allata of the locust-tree caterpillars were large whereas those of the oak forest caterpillars only increased in size when they were fed locust-tree leaves.It is obvious that nutritive stress results in neurosecretory reorganization and changes in the titre of hormones that modulate the morphogenetic programme.

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