scholarly journals The control of anterior foregut motility during a larval molt of the moth Manduca sexta involves the modulation of presynaptic activity

2006 ◽  
Vol 209 (20) ◽  
pp. 4000-4010 ◽  
Author(s):  
J. E. Bestman ◽  
R. Booker
Keyword(s):  
Manduca Sexta ◽  
Larval Molt

scholarly journals DETERMINANTS OF LARVAL MOLT INITIATION IN THE TOBACCO HORNWORM, MANDUCA SEXTA

1984 ◽  
Vol 167 (3) ◽  
pp. 568-578 ◽  
Author(s):  
LOUIS SAFRANEK ◽  
CARROLL M. WILLIAMS
Keyword(s):  
Manduca Sexta ◽  
Tobacco Hornworm ◽  
Larval Molt

scholarly journals Patterns of MHR3 Expression in the Epidermis during a Larval Molt of the Tobacco Hornworm Manduca sexta

2000 ◽  
Vol 227 (2) ◽  
pp. 481-494 ◽  
Author(s):  
Rosalie E Langelan ◽  
Jeffrey E Fisher ◽  
Kiyoshi Hiruma ◽  
Subba Reddy Palli ◽  
Lynn M Riddiford
Keyword(s):  
Manduca Sexta ◽  
Tobacco Hornworm ◽  
Larval Molt

scholarly journals The initiation of pre-ecdysis and ecdysis behaviors in larval Manduca sexta: the roles of the brain, terminal ganglion and eclosion hormone.

1996 ◽  
Vol 199 (8) ◽  
pp. 1757-1769 ◽  
Author(s):  
A Novicki ◽  
J C Weeks
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Manduca Sexta ◽  
Brain Neurons ◽  
Eclosion Hormone ◽  
Terminal Ganglion ◽  
The Central Nervous System ◽  
Time Required ◽  
The Brain ◽  
Larval Molt

Each larval molt of Manduca sexta culminates in the sequential performance of pre-ecdysis (cuticle loosening) and ecdysis (cuticle shedding) behaviors. Both behaviors are thought to be triggered by the release of a peptide, eclosion hormone (EH), from brain neurons whose axons extend the length of the nervous system. EH bioactivity appears in the hemolymph at the onset of pre-ecdysis behavior, and EH injection can trigger pre-ecdysis and ecdysis behaviors prematurely. The present study examined the effects of removing or disconnecting portions of the central nervous system prior to the time of EH release on the initiation of pre-ecdysis and ecdysis behaviors at the final larval molt. We found that the initiation of pre-ecdysis abdominal compressions at the appropriate time required the terminal abdominal ganglion (AT) but not the brain; the initiation of pre-ecdysis proleg retractions at the appropriate time required neither the AT nor the brain; the initiation of ecdysis at the appropriate time usually required the brain but did not require the AT; and premature pre-ecdysis (but not ecdysis) could be elicited in isolated abdomens by injection of EH. Finally, pre-ecdysis behavior performed by brainless larvae was not associated with the normal elevation of EH bioactivity in the hemolymph or the normal loss of EH immunoreactivity from peripheral neurohemal release sites.

Gap junctions in the prothoracic glands of the tobacco hornworm, Manduca sexta

1992 ◽  
Vol 50 (1) ◽  
pp. 706-707
Author(s):  
Ji-da Dai ◽  
M. Joseph Costello ◽  
Lawrence I. Gilbert
Keyword(s):  
Gap Junctions ◽  
Small Molecules ◽  
Manduca Sexta ◽  
Freeze Fracture ◽  
Cell Communication ◽  
Cellular Level ◽  
Thin Sections ◽  
Prothoracic Glands ◽  
Polyhydroxylated Steroids ◽  
Stimulation Of

Insect molting and metamorphosis are elicited by a class of polyhydroxylated steroids, ecdysteroids, that originate in the prothoracic glands (PGs). Prothoracicotropic hormone stimulation of steroidogenesis by the PGs at the cellular level involves both calcium and cAMP. Cell-to-cell communication mediated by gap junctions may play a key role in regulating signal transduction by controlling the transmission of small molecules and ions between adjacent cells. This is the first report of gap junctions in the PGs, the evidence obtained by means of SEM, thin sections and freeze-fracture replicas.

scholarly journals Manduca sexta lipid transfer particle acts upon a lipoprotein to catalyze lipid and apoprotein disproportionation.

1990 ◽  
Vol 265 (1) ◽  
pp. 546-552
Author(s):  
R O Ryan ◽  
R Van Antwerpen ◽  
D J Van der Horst ◽  
A M Beenakkers ◽  
J H Law
Keyword(s):  
Manduca Sexta ◽  
Lipid Transfer
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