Allatotropic activity of the median neurosecretory cells ofGalleria mellonella (lepidoptera) larval brain

1987 ◽  
Vol 43 (8) ◽  
pp. 908-909 ◽  
Author(s):  
M. Muszyńska-Pytel
Keyword(s):  
Neurosecretory Cells ◽  
Larval Brain ◽  
Median Neurosecretory Cells

Co-localization of amines and peptides in the same median neurosecretory cells of locusts

1982 ◽  
Vol 31 (3) ◽  
pp. 237-240 ◽  
Author(s):  
J. Viellemaringe ◽  
P. Duris ◽  
C. Bensch ◽  
J. Girardie
Keyword(s):  
Neurosecretory Cells ◽  
Median Neurosecretory Cells

The Relationships Between Nutrition, Hormones and Reproduction in the Blowfly Calliphora Erythrocephala (Meig.)

1961 ◽  
Vol 38 (3) ◽  
pp. 637-646
Author(s):  
J. STRANGWAYS-DIXON
Keyword(s):  
Gravid Female ◽  
Neurosecretory Cells ◽  
Volume Activity ◽  
Calliphora Erythrocephala ◽  
Carbohydrate Consumption ◽  
Low Protein ◽  
Low Carbohydrate ◽  
Protein Selection ◽  
Median Neurosecretory Cells ◽  
Reproductive Cycles

1. A study has been made of the effects of removal of ovaries, copora allata (c.a.) and median neurosecretory cells (m.n.c.) upon the selection by female blowflies of carbohydrate (sugar in water) or ‘protein’ (Marmite in milk). 2. Extirpation of the ovaries resulted in high carbohydrate-low protein selection and in hypertrophy of the c.a. 3. Extirpation of the c.a. resulted in low carbohydrate selection. 4. Extirpation of both ovaries and c.a. resulted in low carbohydrate selection. 5. These and other results suggest that selection is independent of direct ovarian control, but that the ovaries influence selection in that they utilize the ingested foods and thus bring about the succession of feeding cycles. 6. The c.a., whose volume (activity?) changes cyclically during each cycle of reproduction, appears to control the fluctuations in carbohydrate consumption. 7. The m.n.c. seem to be necessary for the ingestion of ‘protein’ and for the activity of the c.a. 8. Reproductive cycles tend to overlap. The succeeding cycle in a gravid female must be taken into consideration when events are being related to reproduction.

Ovulation in Rhodnius prolixus Stal is induced by an extract of neurosecretory cells

1983 ◽  
Vol 61 (3) ◽  
pp. 684-686 ◽  
Author(s):  
F. L. Kriger ◽  
K. G. Davey
Keyword(s):  
Neurosecretory Cells ◽  
Rhodnius Prolixus ◽  
Pars Intercerebralis ◽  
Median Neurosecretory Cells ◽  
The Brain

The injection of an extract of 10 identified median neurosecretory cells from the pars intercerebralis into gravid mated females previously deprived of these cells by surgery induces ovulation and oviposition during the ensuring 24 h. Injection of an extract of ocellar nerves has no effect. These observations support the hypothesis that ovulation and oviposition are controlled by a myotropin released from neurosecretory cells in the brain.

Role of the Median Neurosecretory Cells in the Ovarian Development of the Blow Fly Protophormia terraenovae

1999 ◽  
Vol 16 (2) ◽  
pp. 187-191 ◽  
Author(s):  
Ikuyo Toyoda ◽  
Hideharu Numata ◽  
Sakiko Shiga
Keyword(s):  
Ovarian Development ◽  
Neurosecretory Cells ◽  
Blow Fly ◽  
Median Neurosecretory Cells

scholarly journals DILP-producing median neurosecretory cells in the Drosophila brain mediate the response of lifespan to nutrition

Aging Cell ◽  
2010 ◽  
Vol 9 (3) ◽  
pp. 336-346 ◽  
Author(s):  
Susan J. Broughton ◽  
Cathy Slack ◽  
Nazif Alic ◽  
Athanasios Metaxakis ◽  
Timothy M. Bass ◽  
...  
Keyword(s):  
Neurosecretory Cells ◽  
Drosophila Brain ◽  
Median Neurosecretory Cells

scholarly journals Insulin signalling regulates remating in female Drosophila

2010 ◽  
Vol 278 (1704) ◽  
pp. 424-431 ◽  
Author(s):  
Stuart Wigby ◽  
Cathy Slack ◽  
Sebastian Grönke ◽  
Pedro Martinez ◽  
Federico C. F. Calboli ◽  
...  
Keyword(s):  
Fat Body ◽  
Insulin Signalling ◽  
Underlying Mechanism ◽  
Neurosecretory Cells ◽  
Dominant Negative ◽  
Developmental Defects ◽  
Mating Rate ◽  
Female Remating ◽  
Reduced Body ◽  
Median Neurosecretory Cells

Mating rate is a major determinant of female lifespan and fitness, and is predicted to optimize at an intermediate level, beyond which superfluous matings are costly. In female Drosophila melanogaster , nutrition is a key regulator of mating rate but the underlying mechanism is unknown. The evolutionarily conserved insulin/insulin-like growth factor-like signalling (IIS) pathway is responsive to nutrition, and regulates development, metabolism, stress resistance, fecundity and lifespan. Here we show that inhibition of IIS, by ablation of Drosophila insulin-like peptide (DILP)-producing median neurosecretory cells, knockout of dilp2 , dilp3 or dilp5 genes, expression of a dominant-negative DILP-receptor ( InR ) transgene or knockout of Lnk , results in reduced female remating rates. IIS-mediated regulation of female remating can occur independent of virgin receptivity, developmental defects, reduced body size or fecundity, and the receipt of the female receptivity-inhibiting male sex peptide. Our results provide a likely mechanism by which females match remating rates to the perceived nutritional environment. The findings suggest that longevity-mediating genes could often have pleiotropic effects on remating rate. However, overexpression of the IIS-regulated transcription factor dFOXO in the fat body—which extends lifespan—does not affect remating rate. Thus, long life and reduced remating are not obligatorily coupled.

Morphology and histology of the endocrine glands of Zootermopsis angusticollis Hagen (Isoptera)

1972 ◽  
Vol 50 (12) ◽  
pp. 1537-1547 ◽  
Author(s):  
Cedric Gillott ◽  
Chih-Ming Yin
Keyword(s):  
Cell Types ◽  
Cell Number ◽  
Neurosecretory Cells ◽  
Corpora Allata ◽  
Endocrine Glands ◽  
Histological Changes ◽  
Secretory Cycle ◽  
Zootermopsis Angusticollis ◽  
Primary Reproductives ◽  
Median Neurosecretory Cells

The morphology and histology of the endocrine glands of the various castes of Zootermopsis angmticollis were examined. Six types of median neurosecretory cells are distinguishable by size and stain affinity. No differences in the relative numbers of these cell types among castes can be seen. It is postulated that they may be different forms of the same cell during its synthetic and secretory cycle. Lateral neurosecretory cells can be identified consistently only in mature primary reproductives of both sexes. In the corpora cardiaca two types of cells occur; the fuchsinophilic cells are distributed generally whereas the cells that take up counterstain are restricted to the center of the gland. Intercellular neurosecretory cell product is found throughout the gland. No histological changes associated with the formation of particular castes were observed. The corpora allata (CA) vary in size and histological appearance according to caste but not sex. The CA of reproductives (primary and supplementary) and presoldiers are larger than those of juveniles of the same instar; those of soldiers are about the same size as those of the corresponding juvenile stage. These size increases are due mainly to changes in the ratio cytoplasmic diameter: nuclear diameter of the constituent cells and not to an increase in cell number. The H-shaped molt glands, which, as in other pterygote insects, disappear within a few days of the imaginal molt, are composed of a large prothoracic portion and a smaller cephalic ('ventral gland') portion extending anteriorly and dorsally. Histologically the two components are indistinguishable. Running through the glands are thin strands of muscle.

Architecture of Cerebral Neurosecretory Cell Systems in the Silkworm Bombyx Mori

1991 ◽  
Vol 161 (1) ◽  
pp. 217-237
Author(s):  
TOSHIO ICHIKAWA
Keyword(s):  
Bombyx Mori ◽  
Nerve Cord ◽  
Action Potentials ◽  
Lucifer Yellow ◽  
Neurosecretory Cells ◽  
Corpus Allatum ◽  
Cell Group ◽  
Neurosecretory Material ◽  
Larval Brain ◽  
Dendritic Branches

Anatomical and physiological characteristics of putative neurosecretory cells (NSCs) in the medial and lateral areas of the larval brain of Bombyx mori, identifiable by the opalescent appearance of their somata, were examined by means of intracellular recording and staining. Intracellular injection of Lucifer Yellow revealed that the medial cell group consisted of at least six subgroups of cells distinguishable by the geometry of their dendritic branches. Five subgroups of cells project axons to the contralateral corpus allatum (CA) or to the corpus cardiacum (CC). The remaining subgroup sends an axon to the ipsilateral ventral nerve cord. Three subgroups of cells were identified in the lateral group, projecting axons to the ipsilateral CC, to the CA or to the contralateral CA. Large and prolonged action potentials, similar to those recorded in some neurosecretory systems, were recorded from these medial and lateral cells. However, two pairs of medial cells containing paraldehyde-fuchsin-positive (neurosecretory) material and with axons extending to the contralateral nerve cord had action potentials of a short duration, more typical of non-NSCs such as tritocerebral cells innervating the stomodeal dilator muscles via the CC.

Ultrastructure of the median neurosecretory cells of Manduca sexta in vivo and in vitro

1973 ◽  
Vol 19 (10) ◽  
pp. 1913-1920 ◽  
Author(s):  
Thomas K. Borg ◽  
Edwin P. Marks
Keyword(s):  
Manduca Sexta ◽  
Neurosecretory Cells ◽  
Median Neurosecretory Cells
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