Ultrastructure of the neurosecretory system of the Colorado potato beetle, Leptinotarsa decemlineata (Say)

Schooneveld, H.

doi:10.1007/bf00223726

Cited by 39 publications

(9 citation statements)

References 21 publications

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“…Similar large translucent vesicles have also been reported in aPSOs/TVNs and the corpora cardiaca of other insect species (Smith and Smith 1966;Brady and Maddrell 1967;Finlayson and Osborne 1968;Schooneveld 1974). With the development of immunoelectron-microscopic techniques, these large translucent vesicles have been demonstrated to contain neuropeptides (Miksys et al 1997;Eckert et al 2002;Pollák et al 2005), although peptides are typically assumed to be stored in large dense-core vesicles.…”

Section: Packaging Of Capa Peptidesmentioning

confidence: 82%

Morphology and metamorphosis of the peptidergic Va neurons and the median nerve system of the fruit fly, Drosophila melanogaster

et al. 2006

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Metamorphosis is a fundamental developmental process and has been intensively studied for various neuron types of Drosophila melanogaster. However, detailed accounts of the fate of identified peptidergic neurons are rare. We have performed a detailed study of the larval morphology and pupal remodelling of identified peptidergic neurons, the CAPA-expressing Va neurons of D. melanogaster. In the larva, Va neurons innervate abdominal median and transverse nerves that are typically associated with perisympathetic organs (PSOs), major neurohaemal release sites in insects. Since median and transverse nerves are lacking in the adult, Va neurites have to undergo substantial remodelling during metamorphosis. We have examined the hitherto uncharacterised gross morphology of the thoracic PSOs and the abdominal median and transverse nerves by scanning electron microscopy and found that the complete reduction of these structures during metamorphosis starts around pupal stage P7 and is completed at P9. Concomitantly, neurite pruning of the Va neurons begins at P6 and is preceded by the high expression of the ecdysone receptor (EcR) subtype B1 in late L3 larvae and the first pupal stages. New neuritic outgrowth mainly occurs from P7-P9 and coincides with the expression of EcR-A, indicating that the remodelling of the Va neurons is under ecdysteroid control. Immunogold-labelling has located the CAPA peptides to large translucent vesicles, which are released from the transverse nerves, as suggested by fusion profiles. Hence, the transverse nerves may serve a neurohaemal function in D. melanogaster.

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Section: Packaging Of Capa Peptidesmentioning

confidence: 82%

Morphology and metamorphosis of the peptidergic Va neurons and the median nerve system of the fruit fly, Drosophila melanogaster

et al. 2006

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“…This study revealed that the corpora allata are innervated by two groups of 8-12 cells, lying in the ipsilateral pars lateralis of the brain (Khan et al, 1984). These cells are identical to the L-type lateral neurosecretory cells (L-NSC) (Schooneveld, 1970(Schooneveld, , 1974. Axons from these cells not only innervate the corpora allata but also arborize extensively in the vicinity of the median NSC, indicating the possibility of synaptic input from this region.…”

Section: Control Of Corpus Allatum Activitymentioning

confidence: 84%

Thirty‐five years of diapause research with the Colorado potato beetle

Kort

1990

Entomologia Exp Applicata

131

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“…The abundance of Iysosomes clearly indicated the inactive nature of the cells. The MNSC of Calliphora erythrocephala (Block et al 1966); Bomb yx mori (Bassurmanova and Panov 1967); Locusta miqratoria (Girardie and Girardie 1967); Leptinotarsa decemlineata (Schooneveld 1974) and Achoeajanata (Muraleedharan and Vargheese 1986) were identified as active or inactive based on the above mentioned features. Scharrer and Brown (1961), Geldiay and Edwards (1973) and Bell et al (1974) observed that inactive neurosecretory cells contained large number of secretory granules in the perikarya.…”

Section: Discussionmentioning

confidence: 99%

Role of endocrines in water balance in the coconut palm beetleOryctes rhinoceros—Ultrastructural and electrophoretic studies

Kannan

1988

Proc. Indian Acad. Sci. (Anim. Sci.)

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Ultrastructural observations on the brain median neurosecretory cells of the hydrated larvae (third instar) of Oryctes rhinoceros showed a well developed granulated endoplasmic reticulum and golgi bodies, indicating active state. The dehydrated animal on the other hand revealed inactive brain median neurosecretory cells with broken and swollen endoplasmic reticulurn and underdeveloped golgi bodies. The axonal endings of the median neurosecretory cells in the corpus cardiacum of the dehydrated animal showed retention of secretory granules. Polyacrylamide gel electrophoretic studies also Showed accumulation of neurosecretory materials in corpus cardiacum and brain samples of the dehydrated animal than those of the hydrated animal. The above results provide additional evidence that the brain median neurosecretory cells are involved in the regulation of water balance by secreting a diuretic hormone in response to hydration stress.

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Ultrastructure of the neurosecretory system of the Colorado potato beetle, Leptinotarsa decemlineata (Say)

Cited by 39 publications

References 21 publications

Morphology and metamorphosis of the peptidergic Va neurons and the median nerve system of the fruit fly, Drosophila melanogaster

Morphology and metamorphosis of the peptidergic Va neurons and the median nerve system of the fruit fly, Drosophila melanogaster

Thirty‐five years of diapause research with the Colorado potato beetle

Role of endocrines in water balance in the coconut palm beetleOryctes rhinoceros—Ultrastructural and electrophoretic studies

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