The brain of the tobacco hornworm, Manduca sexta, as a neuro-endocrine organ — a clue to the evolution of the diffuse neuroendocrine system

1983 ◽  
Vol 5 ◽  
pp. 146
Author(s):  
Magdy El-Salhy ◽  
Sture Falkmer ◽  
KarlJ. Kramer
Keyword(s):  
Manduca Sexta ◽  
Tobacco Hornworm ◽  
Neuroendocrine System ◽  
Endocrine Organ ◽  
Diffuse Neuroendocrine System ◽  
The Brain

The brain adenylate cyclase system of the tobacco hornworm, Manduca sexta

1985 ◽  
Vol 15 (5) ◽  
pp. 579-588 ◽  
Author(s):  
Wendell L. Combest ◽  
David Sheridan ◽  
Lawrence I. Gilbert
Keyword(s):  
Adenylate Cyclase ◽  
Manduca Sexta ◽  
Tobacco Hornworm ◽  
Adenylate Cyclase System ◽  
The Brain

Control of Moulting and Metamorphosis in the Tobacco Hornworm, Manduca Sexta (L.): Cessation of Juvenile Hormone Secretion as a Trigger for Pupation

1974 ◽  
Vol 61 (2) ◽  
pp. 493-501 ◽  
Author(s):  
H. FREDERIK NIJHOUT ◽  
CARROLL M. WILLIAMS
Keyword(s):  
Juvenile Hormone ◽  
Manduca Sexta ◽  
Larval Instar ◽  
Hormone Secretion ◽  
Tobacco Hornworm ◽  
Corpora Allata ◽  
Functional Failure ◽  
Prothoracicotropic Hormone ◽  
The Brain

During the final larval instar of the tobacco hornworm the presence of juvenile hormone (JH) inhibits the secretion of the brain's prothoracicotropic hormone (PTTH). The corpora allata cease to secrete JH when the larvae attain a weight of approximately 5 g. The JH is cleared from the haemolymph in about 24 h. This process in itself renders the brain competent to release PTTH. The actual release of PTTH occurs at the very first photo-periodic gate after the JH has disappeared from the haemolymph. A functional failure of this normal mechanism is apparently responsible for the developmental standstill of Lepidoptera which diapause as mature larvae.

scholarly journals Localization and release of FMRFamide-like immunoreactivity in the cerebral neuroendocrine system of Manduca sexta

1986 ◽  
Vol 126 (1) ◽  
pp. 1-14 ◽  
Author(s):  
L. S. Carroll ◽  
G. M. Carrow ◽  
R. L. Calabrese
Keyword(s):  
Manduca Sexta ◽  
Indirect Immunofluorescence ◽  
Lucifer Yellow ◽  
Neuroendocrine System ◽  
Corpora Allata ◽  
Immunocytochemical Staining ◽  
High Potassium ◽  
Bathing Medium ◽  
Calcium Dependent ◽  
The Brain

The distribution of FMRFamide-like immunoreactivity (FLI) in the cerebral neuroendocrine system of the moth, Manduca sexta, is described and evidence is provided for calcium-dependent release of FLI from the neurohaemal organs. FLI was detected by indirect immunofluorescence in approximately 25 bilaterally symmetrical pairs of somata in the pupal protocerebrum. In addition, FLI was observed in neurites in the brain, as well as in axons of the nervi corporis cardiaci and nervi corporis allati, and in terminals in the neurohaemal corpora cardiaca (CC) and corpora allata (CA). All immunocytochemical staining was blocked by preabsorption of the anti-FMRFamide antiserum with synthetic FMRFamide. We localized FLI to identified protocerebral neurosecretory cells (NSCs) by combining intracellular injection of Lucifer Yellow and indirect immunofluorescence. Among the NSCs in each hemisphere, FLI was observed in both group IIa (lateral) cells, in most group IIb (lateral) cells, and in two cells of group Ib (medial). FLI was extracted from the brain and neurohaemal organs and measured using radioimmunoassay (RIA). Calcium-dependent release of FLI was evoked from isolated CC-CA by high potassium depolarization in vitro and was quantified by RIA of the bathing medium. These results suggest that FLI may have a neurohormonal or neurotransmitter function in Manduca.

Polyamine Regulation of Protein Phosphorylation in the Brain of the Tobacco Hornworm, Manduca sexta

1987 ◽  
Vol 48 (3) ◽  
pp. 935-942 ◽  
Author(s):  
Mark J. Birnbaum ◽  
Wendell L. Combest ◽  
Timothy J. Bloom ◽  
Lawrence I. Gilbert
Keyword(s):  
Protein Phosphorylation ◽  
Manduca Sexta ◽  
Tobacco Hornworm ◽  
The Brain
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