Sites of ecdysteroid biosynthesis in female adults of Gryllus bimaculatus (Ensifera, Gryllidae)

Hoffmann, Klaus H.; Weidner, Karin; Seidel, Mira

doi:10.1007/bf00301623

Cited by 12 publications

(4 citation statements)

References 27 publications

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“…Our observation that the integument plus adhering fat body of M. sanguinipes is capable of ecdysteroid synthesis in vitro confirms what has been demonstrated in other species (Cassier et al, 1980;Porcheron et al, 1984;Hoffmann et al, 1992;Weidner et al, 1992). The synthetic activity of the integument-fat body complex is about 2.5-fold greater than that of the testis and may be largely responsible for the ecdysteroids found in the hemolymph, given the parallel changes in integumental ecdysteroid production and hemolymph ecdysteroid titer (Ismail and Gillott, 1993).…”

Section: Discussionsupporting

confidence: 92%

“…The synthetic activity of the integument-fat body complex is about 2.5-fold greater than that of the testis and may be largely responsible for the ecdysteroids found in the hemolymph, given the parallel changes in integumental ecdysteroid production and hemolymph ecdysteroid titer (Ismail and Gillott, 1993). Whether ecdysteroid production within this complex is the responsibility of oenocytes, as is the case in Tenebrio molitor (Romer et al, 1974), Bombyx mori (Romer,199 i ) , and Gryllus bimaculatus (Romer, 1991; though this is disputed by Hoffmann et al, 1992), has not yet been considered in M. sanguinipes. Bressel et al (1990) carried out in vitro cultures of several tissues in male G. bimaculatus and found that the MARG secrete small amounts of ecdysteroids.…”

Section: Discussionmentioning

confidence: 94%

“…ovary (Hagedorn et al, 1975, Hagedorn, 1985, integument (Cassier et al, 1980;Porcheron et al, In additioil to the molt glands, several other sites 1984; Hoffmann et al, 1992;Weidner et al, 1992), of ecdysteroid synthesis in insects have been reported and male accessory reproductive glands (MARG) (reviewed by Delbecque et al, 1990). In vitro organ- can synthesize ecdysteroid.…”

Section: Introductionmentioning

confidence: 95%

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In vitrosynthesis of ecdysteroid by the male accessory reproductive glands, testis and abdominal integument of the adult migratory grasshopper,Melanoplus sanguinipes

Gillott

Ismail

1995

Invertebrate Reproduction & Development

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Invertebrate Reproduction and Development, 27: 1 (1995) 65-71 Balaban, PhiladelphiaIRehovot 0168-8170/95/$05.00 O 1995 BalabanIn vitro synthesis of ecdysteroid by the male accessory reproductive glands, testis and abdominal integument of the adult migratory grasshopper, Melanoplus sanguinipes SummaryMale accessory reproductive glands (MARG), testis (including its sheath) and abdominal integument along with adhering fat body were cultured in vitro to determine their ability to synthesize ecdysteroid during the first 10 days of adult development. Ecdysteroid synthesis by MARG was highest on day 2 (0.180 nglmg) while the testis showed a peak on day 5 (0.436 nglmg). In the testis, the sheath is mainly responsible for ecdysteroid synthesis. Ecdysteroid is also synthesized by the abdominal integument with adhering fat body, and peak activity is observed on day 8 (0.50 nglmg). A time-course study showed that ecdysteroid synthesis increased linearly in all tissues over a 24-h incubation period. However, little storage of ecdysteroid occurred in the tissues.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 95%

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In vitrosynthesis of ecdysteroid by the male accessory reproductive glands, testis and abdominal integument of the adult migratory grasshopper,Melanoplus sanguinipes

Gillott

Ismail

1995

Invertebrate Reproduction & Development

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“…A generalized scheme for ecdysteroidogenesis is presented in Figure 1. The pathway is derived from the isolation of ecdysteroid precursors from the ovaries of L. migratoria (51) and from work using radiolabeled precursors with the ovaries of L. migratoria (26,31,53,118), Schistocerca gregaria (25,41,118,121), Gryllus bimaculatus (55), and Drosophila melanogaster (155), and testes of cotton leafworm Spodoptera littoralis (64) complemented with results from PGs of immature insects and Y-organs of crustaceans. The reports of ecdysteroid precursor isolation from crustacean ovaries and metabolism of an ecdysteroid precursor to ecdysone by myriapod gonads prompted the more inclusive use of arthropod gonads in the review (22,52,145).…”

Section: Pathways For Ecdysteroid Biosynthesismentioning

confidence: 99%

Gonadal Ecdysteroidogenesis in Arthropoda: Occurrence and Regulation

Brown

Sieglaff²,

Rees³

2009

Annu. Rev. Entomol.

111

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Ecdysteroids are multifunctional hormones in male and female arthropods and are stored in oocytes for use during embryogenesis. Ecdysteroid biosynthesis and its hormonal regulation are demonstrated for insect gonads, but not for the gonads of other arthropods. The Y-organ in the cephalothorax of crustaceans and the integument of ticks are sources of secreted ecdysteroids in adults, as in earlier stages, but the tissue source is not known for adults in many arthropod groups. Ecdysteroid metabolism occurs in several tissues of adult arthropods. This review summarizes the evidence for ecdysteroid biosynthesis by gonads and its metabolism in adult arthropods and considers the apparent uniqueness of ecdysteroid hormones in arthropods, given the predominance of vertebrate-type steroids in sister invertebrate groups and vertebrates.

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Vitellogenin levels in allatectomized female crickets,Gryllus bimaculatus de geer (ensifera, gryllidae)

Hoffmann

Sorge

1996

Arch. Insect Biochem. Physiol.

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Allatectomy of cricket nymphs up to 24 h after the moult to the last instar resulted in moulting to normal adults which laid a low number of eggs. No juvenile hormone III and no vitellogenin were detected in the haemolymph of allatectomized females by means of GC‐mass spectrometry (MS) and rocket immunoelectrophoresis, respectively, whereas the eggs contained the normal pattern of vitellins as judged by SDS‐PAGE. Ovariectomy of previously allatectomized females led to a moderate accumulation of vitellogenin in the haemolymph. Administration of the juvenile hormone analogues hydroprene, methoprene, and fenoxycarb to allatectomized females restored egg production to a variable extent. Injections of 20‐hydroxyecdysone increased haemolymph vitellogenin titer of allatectomized females, but did not affect the number of produced eggs. Treatment with hydroprene and 20‐hydroxyecdysone showed a synergistic effect. It is suggested that juvenile hormone does not have an all‐embracing control on vitellogenesis, though it does exert a marked quantitative effect on vitellogenin synthesis and the rate of egg production. © 1996 Wiley‐Liss, Inc.

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Sites of ecdysteroid biosynthesis in female adults of Gryllus bimaculatus (Ensifera, Gryllidae)

Cited by 12 publications

References 27 publications

In vitrosynthesis of ecdysteroid by the male accessory reproductive glands, testis and abdominal integument of the adult migratory grasshopper,Melanoplus sanguinipes

In vitrosynthesis of ecdysteroid by the male accessory reproductive glands, testis and abdominal integument of the adult migratory grasshopper,Melanoplus sanguinipes

Gonadal Ecdysteroidogenesis in Arthropoda: Occurrence and Regulation

Vitellogenin levels in allatectomized female crickets,Gryllus bimaculatus de geer (ensifera, gryllidae)

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