Neurons projecting from the brain to the corpora allata in orthopteroid insects: anatomy and physiology

Virant-Doberlet, Meta; Horseman, G.; Loher, Werner; Huber, Franz

doi:10.1007/s004410050130

Cited by 6 publications

(13 citation statements)

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“…Arborization of the PL neurons in the superior protocerebral neuropil has been equally reported in the cockroach Periplaneta americana (Pipa 1978;Koontz and Edwards 1980;Virant-Doberlet et al 1994), the crickets Acheta domesticus and Gryllus bimaculatus (Koontz and Edwards 1980;Virant-Doberlet et al 1994), the grasshoppers Gomphocerus rufus, Schistocerca gregaria and L. migratoria (Koontz and Edwards 1980;Virant-Doberlet et al 1994), the beetle L. decemlineata (Khan et al 1984), and the moth M. sexta (Copenhaver and Truman 1986), as in the blow fly, P. terraenovae. However, the occurrence of processes of the PL neurons around the intracerebral tract of NCC I, which corresponds to a component of the MB in flies, varies among these insects.…”

Section: Pl Neuronsmentioning

confidence: 87%

“…However, the occurrence of processes of the PL neurons around the intracerebral tract of NCC I, which corresponds to a component of the MB in flies, varies among these insects. In contrast, in the cockroach there are prominent PL processes around the tract of NCC I (Pipa 1978;Virant-Doberlet et al 1994), and in crickets there is only a moderate number of PL fibers associated with this tract . In contrast, in the cockroach there are prominent PL processes around the tract of NCC I (Pipa 1978;Virant-Doberlet et al 1994), and in crickets there is only a moderate number of PL fibers associated with this tract .…”

Section: Pl Neuronsmentioning

confidence: 87%

“…10c). In various studies of the orthopterans, dictyopterans and lepidopterans, there is no indication of a direct communication between the neurosecretory cells of the brain and of the subesophageal ganglion (Mason 1973;Koontz and Edwards 1980;Copenhaver and Truman 1986;Moore and Loher 1988;Virant-Doberlet et al 1994). In various studies of the orthopterans, dictyopterans and lepidopterans, there is no indication of a direct communication between the neurosecretory cells of the brain and of the subesophageal ganglion (Mason 1973;Koontz and Edwards 1980;Copenhaver and Truman 1986;Moore and Loher 1988;Virant-Doberlet et al 1994).…”

Section: Seg Neuronsmentioning

confidence: 99%

“…Orthograde fills from the pars intercerebralis confirmed that some PI neurons do have terminals on the CA, but these fibers are restricted to the proximal surface and, therefore, might have a neurohemal function. In contrast, only PL neurons were found to innervate the CA in grasshoppers (Mason 1973;Virant-Doberlet et al 1994). In the fly C. erythrocephala, antigastrin/CCK immunostaining demonstrated that some neurosecretory cells in the pars intercerebralis have varicose fibers in the CRN and terminals only in the CC-HG (Duve et al 1983).…”

Section: Seg Neuronsmentioning

confidence: 99%

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Neurons projecting to the retrocerebral complex of the adult blow fly, Protophormia terraenovae

Shiga¹,

Toyoda²,

Numata³

2000

Cell and Tissue Research

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Anatomical study of neurons projecting to the retrocerebral complex of the adult blow fly, Protophormia terraenovae, was done by NiCl2 filling and immunocytochemistry. Retrograde filling through the cardiac-recurrent nerve labeled three groups of neurons in the brain/subesophageal ganglion: (1) paramedial clusters of the pars intercerebralis, (2) neurons in each pars lateralis, and (3) neurons in the subesophageal ganglion. The pars intercerebralis neurons send prominent axons into the median bundle and exit from the brain via the contralateral nervus corporis cardiaci. Based on the projection pattern, two types of the pars lateralis neurons can be distinguished: the most lateral pairs of neurons contralaterally extend through the posterior lateral tract and the remainder ipsilaterally extend through the posterior lateral tract. The neurons in the subesophageal ganglion run through the contralateral nervus corporis cardiaci. The dendritic arborization of the pars intercerebralis and pars lateralis neurons is restricted to the superior protocerebral neuropil and to the anterior neuropil of the subesophageal ganglion where the neurons in the subesophageal ganglion also project. Retrograde filling from the corpus allatum indicated that the pars lateralis neurons and a few pars intercerebralis neurons project to the corpus allatum, but that the neurons in the subesophageal ganglion do not. Orthograde filling from the pars intercerebralis and staining by paraldehyde-thionin/paraldehyde-fuchsin indicated that the pars intercerebralis neurons project primarily to the corpus cardiacum/hypocerebral ganglion complex. Immunostaining with a polyclonal antiserum against diapause hormone, a member of the FXPRLamide family, suggests that some of the subesophageal ganglion neurons contain FXPRLamide-like peptides.

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Section: Pl Neuronsmentioning

confidence: 87%

Section: Pl Neuronsmentioning

confidence: 87%

Section: Seg Neuronsmentioning

confidence: 99%

Section: Seg Neuronsmentioning

confidence: 99%

See 2 more Smart Citations

Neurons projecting to the retrocerebral complex of the adult blow fly, Protophormia terraenovae

Shiga¹,

Toyoda²,

Numata³

2000

Cell and Tissue Research

View full text Add to dashboard Cite

show abstract

“…The CA and their secretory product the JH, play a role not only in insect development and metamorphosis, but also in sexual maturation, reproductive physiology, and adult diapause Virant-Doberlet et al, 1994). In addition, there is increasing evidence that JH is an important factor for the regulation of behaviour: division of labour in honey bees (Robinson, 1992) and migratory behaviour (Rankin, 1991).…”

Section: Introductionmentioning

confidence: 99%

Multifactorial control of the release of hormones from the locust retrocerebral complex

Vullings

Diederen

Veelaert³

et al. 1999

Microsc. Res. Tech.

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Photoperiod and temperature separately regulate nymphal development through JH and insulin/TOR signaling pathways in an insect

Miki

Shinohara

Chafino

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Insects living in the temperate zone enter a physiological state of arrested or slowed development to overcome an adverse season, such as winter. Developmental arrest, called diapause, occurs at a species-specific developmental stage, and embryonic and pupal diapauses have been extensively studied in mostly holometabolous insects. Some other insects overwinter in the nymphal stage with slow growth for which the mechanism is poorly understood. Here, we show that this nymphal period of slow growth is regulated by temperature and photoperiod through separate pathways in the cricket Modicogryllus siamensis. The former regulates the growth rate, at least in part, through the insulin / target of rapamycin (TOR) signaling pathway. Lower temperature down-regulates the expression of insulin-like peptide (Ms’Ilp) and Target of rapamycin (Ms’Tor) genes to slow down the growth rate without affecting the number of molts. The latter regulates the number of molts independent of temperature. Short days increase the number of molts through activation of the juvenile hormone (JH) pathway and down-regulation of myoglianin (Ms’myo), a member of the TGFβ family, which induces adult metamorphosis. In contrast, long days regulate Ms’myo expression to increase during the fifth to sixth instar to initiate adult metamorphosis. When Ms’myo expression is suppressed, juvenile hormone O-methyl transferase (Ms’jhamt) was up-regulated and increased molts to prolong the nymphal period even under long-day conditions. The present findings suggested that the photoperiod regulated Ms’myo, and the JH signaling pathway and the temperature-controlled insulin/TOR pathway cooperated to regulate nymphal development for overwintering to achieve seasonal adaptation of the life cycle in M. siamensis.

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Neurons projecting from the brain to the corpora allata in orthopteroid insects: anatomy and physiology

Cited by 6 publications

References 0 publications

Neurons projecting to the retrocerebral complex of the adult blow fly, Protophormia terraenovae

Neurons projecting to the retrocerebral complex of the adult blow fly, Protophormia terraenovae

Multifactorial control of the release of hormones from the locust retrocerebral complex

Photoperiod and temperature separately regulate nymphal development through JH and insulin/TOR signaling pathways in an insect

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