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Results for “Neurosecretion”

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At least 559 records · Page 31Linked to original sources
PubMed1980

Neurosecretion in the frontal ganglion of Achoea janata Linn. and Philosamia ricini (Hutt.) (Lepidoptera).

The cytomorphology of the neurosecretory cells in the frontal ganglion of two Lepidopterous insects, Achoea janata and Philosamia ricini have been studied using PF, PARF and PAVB techniques. In the frontal ganglion of both the insects conspicuous 2 to 3 oval A-cells, staining deep purple and a number of B-cells staining green have been clearly observed. The A-cells have been observed to be located either in the centre or close to the root of the recurrent nerve or to the frontal ganglion connective. Both the A and B types of cells show a distinct cyclic change during larval development. The endocrine nature of frontal ganglion is clearly demonstrated.

Animals↗
PubMed1976

[Autogenesis and cerebral neurosecretion in Aedes detritus (Haliday, 1833) (Diptera - Culicidae].

In anautogenous females of the Dipteran Culicidae Aedes detritus (Haliday, 1833), the neurosecretory products synthesized by the A cells of the pars intercerebralis are stored in the pericarya in absence of blood meal; on the contrary, in the autogenous females they are steadily released from emergency till the stages 3-4 of vitellogenesis; a slight storage occurs by the end of vitellogenesis. These facts suggest the important meaning of these cells in the regulation processes of vitellogenesis in Mosquitoes.

Aedes↗
PubMedDate not supplied

The effect of a high-voltage electric fiedl on neurosecretion and on certain diencephalic protein fractions in the rat.

Exposure of Wistar male rats to an electric field of 100 lV/m for 120 minutes produced intense mobilization of the neurosecretory material in the supraoptic and paraventricular nuclei and significant changes in some protein fractions of the hypothalamus, pineal body and neurohypophysis. The significance and possible mechanisms of these effects are discussed.

Animals↗
PubMed1996

Is actin polymerization relevant to neurosecretion? A study on neuroblastoma cells.

We have investigated the relevance of actin rearrangement to neurotransmitter release, in neuroblastoma cell line SH-SY5Y stimulated with carbachol (1 mM). Carbachol reversibly polymerizes actin and releases norepinephrine in undifferentiated SH-SY5Y cells as well as in tetradecanoylphorbol 13-acetate (16 nM) and retinoic acid (5 microM) differentiated SH-SY5Y cells. Microscopic analysis of F-actin distribution indicates polymerization of cortical actin. Prior treatment with iota toxin E from Clostridium perfringens inhibits both carbachol-induced actin polymerization and norepinephrine release, slightly affecting the basal actin network. These data suggest that actin polymerization is associated with norepinephrine release.

Actins↗
PubMed1987

'Neurosecretion' by a classic cholinergic innervation apparatus. A comparative study of adrenal chromaffin glands in four vertebrate species (teleosts, anurans, mammals).

Nerve terminals forming typical synapses with adrenal chromaffin tissues have been examined in the goldfish, frog (Rana pipiens), hamster and rat. Presumptive secretory inclusions present in the terminals are of two distinct types. Electron-lucent synaptic vesicles 30-50 nm in diameter are densely clustered adjacent to membrane thickenings and presumably discharge their contents into the synaptic clefts. Secretory granules (i.e. large dense-cored vesicles) 60-100 nm in diameter are more abundant in other parts of the terminals. Sites of granule exocytosis have been observed in each of the animals investigated. They are usually encountered within apparently undifferentiated areas of plasmalemma and only rarely occur within synaptic thickenings. Granule exocytosis from within synaptic terminals and chromaffin gland cells is most readily observed in specimens exposed, prior to fixation, to saline solutions containing both tannic acid, and 4-aminopyridine and/or elevated levels of K+. These findings show that the pattern of secretory discharge, involving both synaptic and non-synaptic release, which is widespread in invertebrate central nervous system, is also characteristic of vertebrate, peripheral cholinergic terminals.

Adrenal Medulla↗
PubMed1977

Neurosecretion in the basommatophoran snail Bulinus truncatus (Gastropoda, Pulmonata).

The neurosecretory system of the freshwater snail Bulinus truncatus was investigated. With the Alcian blue-Alcian yellow (AB/AY) staining method at least 10 different types of neurosecretory cells (NSC) were distinguished in the ganglia of the central nervous system. The differences in staining properties of the NSC - with AB/AY the cells take on different shades of green and yellow - are borne out at the ultrastructural level: the NSC types contain different types of neurosecretory elementary granules. The neurosecretory system of B. truncatus is compared to that of Lymnaea stagnalis, the species which has received the most attention among the pulmonates. It appears from the comparison that the systems of both species show many similarities, although some differences are also apparent.

Alcian Blue↗
PubMed2000

Neurosecretion: peptidergic systems in insects.

Insect neuropeptides are produced in less than 1% of the cells of the central nervous system. Despite this, they are important messenger molecules which influence nearly all physiological processes, including behaviour. They can act as transmitters, modulators and classical hormones, and often exhibit pleiotropic functions when released into the haemolymph. The large number of neuropeptides that has been identified from some of the model organisms among insects underlines the complexity of the neurosecretory system; studies about the coordinated actions of these substances are in their preliminary stages. Recent advances in insect neuropeptide research will be reviewed here, concentrating on the distribution of multiple peptide forms in the central nervous system and adjacent neurohaemal organs, and the role of neuropeptides in eclosion behaviour.

Amino Acid Sequence↗