Allatotropic activity in the suboesophageal ganglia and corpora cardiaca of the adult male loreyi leafworm, Mythimna loreyi

Kou, Rong; Chen, Shu-Jung

doi:10.1002/(sici)1520-6327(200002)43:2<78::aid-arch4>3.3.co;2-x

Cited by 4 publications

(6 citation statements)

References 13 publications

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“…Mas‐AT stimulated JH synthesis in CA of M. sexta adults, and adults of the noctuid moths Heliothis virescens (Kataoka et al ., 1989), L. oleracea (Audsley et al ., 1999) and S. frugiperda (Oeh et al ., 2000), as well as L. oleracea larvae (Audsley et al ., 2000), but CA from the beetle Tenebrio molitor , the grasshopper Schistocerca gregaria , and the cockroach Periplaneta americana were not affected (Kataoka et al ., 1989). Mas‐AT increased JH synthesis in CA of adult male loreyi leafworm, Mythimna loreyi , but this effect was not significant (Kou & Chen, 2000). Therefore, it seems that CA‐activating effects by Mas‐AT are possibly limited to lepidopteran species (Hoffmann et al ., 1999; Oeh et al ., 2000).…”

Section: Introductionmentioning

confidence: 98%

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Allatotropic and allatostatic activities in extracts of brain and the effects of Manduca sexta allatotropin and Manduca sexta allatostatin on juvenile hormone synthesis in vitro by corpora allata from the Eri silkworm, Samia cynthia ricini

Jiang

Cao

2002

Physiological Entomology

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Abstract. Both allatotropic and allatostatic activities were found in crude extracts of brain from adult and larval Eri silkworm, Samia cynthia ricini, but it seems that allatotropic activity dominates in each stage. There was a high level of allatotropic activity in the crude extract of brain from newly emerged female adults, but allatostatic activity appeared in the bioassay when excessive amounts of crude extracts of brain were added. Crude extracts of brain from premoulting fourthinstar larvae and from newly ecdysed fifth-instar larvae exhibited allatotropic activities, whereas extracts of brain from the second and third day of the fifthinstar larvae inhibited juvenile hormone (JH) release slightly. Allatotropic activity from the brains of adults and larvae stimulated both adult and larval corpora allata (CA) to synthesize JH. Manduca sexta allatotropin (AT) (Mas-AT) and M. sexta allatostatin (AST) (Mas-AST) also stimulated and inhibited both adult and larval S. cynthia ricini CA to synthesize JH, respectively. Higher concentrations of Mas-AT (10 À4 or 10 À3 M) showed an inhibitory effect on adult CA. CA from newly emerged female adults were the most sensitive to inhibition by Mas-AST, whereas CA from female pharate adults at about 6 h before adult emergence were the most sensitive to stimulation by Mas-AT and S. cynthia ricini brain allatotropic activity. An extract of brain and Mas-AT induced some of the non-active female pharate adult CA at 12 h before emergence to synthesize a small amount of JH.

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Section: Introductionmentioning

confidence: 98%

“…Therefore, it seems that CA‐activating effects by Mas‐AT are possibly limited to lepidopteran species (Hoffmann et al ., 1999; Oeh et al ., 2000). Many other allatotropic factors have been found in several insect species, but none has yet been identified (Hoffmann et al ., 1999; Kou & Chen, 2000).…”

Section: Introductionmentioning

confidence: 99%

Allatotropic and allatostatic activities in extracts of brain and the effects of Manduca sexta allatotropin and Manduca sexta allatostatin on juvenile hormone synthesis in vitro by corpora allata from the Eri silkworm, Samia cynthia ricini

Jiang

Cao

2002

Physiological Entomology

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“…Stimulation of JH biosynthesis by the corpora allata of adult female Aedes aegypti in vitro: effect of farnesoic acid and Aedes allatotropin 1992), crickets Gryllus bimaculatus and Acheta domesticus (Lorenz and Hoffmann, 1995), true bug Pyrrhocoris apterus (Hodkova et al, 1996), Loreyi leafworm Mythimna loreyi (Kou and Chen, 2000) and the honey bee Apis mellifera (Gäde et al, 1997), so far only a single peptide has been chemically identified. This is the Manduca sexta allatotropin (Mas-AT) identified from heads of the pharate adult tobacco hornworm Manduca sexta (Kataoka et al, 1989), a 13-residue amidated peptide with the sequence GFKNVEMMTARGFamide that stimulates adult CA in vitro but does not affect the activity of larval or pupal CA (Kataoka et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

Stimulation of JH biosynthesis by the corpora allata of adult female Aedes aegypti in vitro: effect of farnesoic acid and Aedesallatotropin

Unnithan

Veenstra

et al. 2003

Journal of Experimental Biology

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SUMMARY Previous studies have demonstrated that the synthesis of juvenile hormone(JH) by the isolated corpora allata (CA) complex in vitro as well as the JH titer in the yellow fever mosquito Aedes aegypti are elevated before feeding and low after a blood meal. In the present study, we used an in vitro radiochemical assay to analyze the effect of farnesoic acid(FA) and Aedes allatotropin (Aedes-AT) on the biosynthesis of JH and methyl farnesoate (MF) by the isolated CA complex of A. aegypti adult female. CA complex from day-0 females (0–1 h after emergence) exhibited a low basal juvenile hormone III (JH III) biosynthetic activity and did not respond to either allatotropic or FA stimulation. However, incubation of CA complexes from newly emerged females with Aedes-AT plus FA resulted in very high production of JH III. This is the first report suggesting that allatotropin makes corpora allata in newly emerged females capable for JH biosynthesis. When we studied CA complexes dissected from females 1 day after emergence, the stimulatory action of Aedes-AT was strong and dose-dependent,with maximum stimulation in the range of 10–8–10–9 mol l–1,suggesting that Aedes-AT is indeed a true allatotropin (a molecule with allatotropic activity) in A. aegypti. The addition to the culture medium of 40 μmol l–1 FA, a JH precursor, resulted in a 9-fold increase in JH III biosynthesis in 2-, 4- and 6-day-old sugar-fed females. The two major labeled products synthesized by the stimulated CA complex were identified as JH III and MF by RP-HPLC and GC–MS. Treatment of CA complexes with FA, but not Aedes-AT, resulted in an increase in MF. Application of both Aedes-AT and FA to the CA complexes of 2-, 4- and 6-day-old females resulted in the same effects as FA alone. These data suggest that in sugar-fed females, FA and Aedes-AT exert different effects on the terminal steps in JH biosynthesis.

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“…As in other lepidopteran moths, the brain and the SOG of the M. loreyi are fused to form a complex in the adult stage ( Copenhaver & Truman, 1986) . Although the allatotropic activity was found in methanolic extract of the SOG and CC ( Kou & Chen, 2000), the existence of peptidergic factor(s) in brain–SOG–CC extracts, which stimulate synthesis of JHA in vitro is reported in this study; and the effects of NCA I and NCA II on the allatotropic control of CA is also examined.…”

Section: Introductionmentioning

confidence: 80%

“…1989 ). In fact, further investigation showed that the source of the allatotropin might be the SOG or CC ( Kou & Chen, 2000). Further elucidation of the amino acid sequences of the allatotropins in this insect is now in progress in our laboratory.…”

Section: Discussionmentioning

confidence: 99%

Allatotropic and nervous control of corpora allata in the adult male loreyi leafworm, Mythimna loreyi (Lepidoptera: Noctuidae)

Kou

Chen

2000

Physiological Entomology

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Summary Allatotropic activity is found in methanolic extracts of the brain–suboesophageal ganglion (SOG)–corpora cardiaca (CC) complex from virgin males of Mythimna loreyi Duponchel (Lepidoptera, Noctuidae). Corpora allata (CA) from 6‐day‐old virgin males exhibit low rates of release of Juvenile Hormone (JH) acid (JHA) in vitro. Release of JHA can be activated by the addition of an extract of brain–SOG–CC complex in a dose‐dependent manner, and this allatotropic activation can be sustained consistently in the continuous presence of such extracts. Based on its trypsin sensitivity and heat stability, the allatotropic factor is most likely a peptide. The allatotropic activity is dependent on the concentration of calcium ions in the medium, with the highest activation achieved beyond 2 m m. The results of nerve transection experiments suggest that both nervi corporis allati I (NCA I) and NCA II are involved in mediating the allatotropic control of CA in vitro. Isolated CA alone show significantly higher rates of release of JHA than the intact brain–SOG–CC–CA complex during the first 3 h of incubation, but the release of JHA reaches almost the same range in both groups by the end of the fourth hour of incubation.

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Allatotropic activity in the suboesophageal ganglia and corpora cardiaca of the adult male loreyi leafworm, Mythimna loreyi

Cited by 4 publications

References 13 publications

Allatotropic and allatostatic activities in extracts of brain and the effects of Manduca sexta allatotropin and Manduca sexta allatostatin on juvenile hormone synthesis in vitro by corpora allata from the Eri silkworm, Samia cynthia ricini

Allatotropic and allatostatic activities in extracts of brain and the effects of Manduca sexta allatotropin and Manduca sexta allatostatin on juvenile hormone synthesis in vitro by corpora allata from the Eri silkworm, Samia cynthia ricini

Stimulation of JH biosynthesis by the corpora allata of adult female Aedes aegypti in vitro: effect of farnesoic acid and Aedesallatotropin

Allatotropic and nervous control of corpora allata in the adult male loreyi leafworm, Mythimna loreyi (Lepidoptera: Noctuidae)

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