Activity of the Incretory Centres of Locustana pardalina during Embryogenesis: Function of the Prothoracic Glands

Nature ◽  
1953 ◽  
Vol 172 (4377) ◽  
pp. 551-551 ◽  
Author(s):  
BRYN M. JOKES
Keyword(s):  
Prothoracic Glands ◽  
Locustana Pardalina

Mitochondrial Transformations in the Crayfish Y-Organ During Molt

1971 ◽  
Vol 29 ◽  
pp. 514-515
Author(s):  
Ernest F. Couch
Keyword(s):  
Sinus Gland ◽  
Molt Cycle ◽  
Prothoracic Glands

Crustacea, like insects, possess ecdysial glands that produce a hormone governing molting and growth. The hormone is a steriod and the same steroid has been found in insects. The steriod has been given several names, among them are crustecdysone and ecdysterone. The ecdysial glands in insects are named prothoracic glands while the homologous structures in crayfish and other Crustacea are called Y-organs. Y-organs do not always contain the same titer of ecdysterone (Passano and Jyssum, 1963), having the greatest amount of the hormone during the period preceding ecdysis. The cyclical activity of the gland is controlled by a neurosecretory hormone, the molt inhibiting hormone (MIH), released by the sinus gland.Y-organs for this study were obtained from the crayfish, Procambarus simulans. They were fixed with either 3% glutaraldehyde followed by 1% osmium tetroside or simply fixed in buffered 1% osmium. Tissues were embedded in Araldite 502 and prepared for electron miscroscopy. Glands were taken from animals in various periods of the molt cycle.

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.

Tris stimulates ecdysteroid secretion via Ca2+ messenger system in the prothoracic glands of Locusta migratoria

2005 ◽  
Vol 30 (3) ◽  
pp. 270-277 ◽  
Author(s):  
Ales Neuwirth ◽  
Dalibor KodriK ◽  
Heiner Birkenbeil ◽  
Frantisek Sehnal
Keyword(s):  
Locusta Migratoria ◽  
Prothoracic Glands ◽  
Messenger System

Synthesis and secretion of ecdysteroids by the prothoracic glands of Manduca sexta

1988 ◽  
Vol 34 (7) ◽  
pp. 571-576 ◽  
Author(s):  
J.T. Warren ◽  
S. Sakurai ◽  
D.B. Rountree ◽  
L.I. Gilbert
Keyword(s):  
Manduca Sexta ◽  
Prothoracic Glands
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