Precocenes induce effect of juvenile hormone excess in Locusta migratoria

Nature ◽  
1980 ◽  
Vol 286 (5774) ◽  
pp. 711-713 ◽  
Author(s):  
S. Fridman-Cohen ◽  
M. P. Pener
Keyword(s):  
Juvenile Hormone ◽  
Locusta Migratoria ◽  
Induce Effect

Juvenile Hormone Control of Vitellogenin Synthesis in Locusta migratoria

1976 ◽  
pp. 505-529 ◽  
Author(s):  
T. T. Chen ◽  
P. Couble ◽  
F. L. De Lucca ◽  
G. R. Wyatt
Keyword(s):  
Juvenile Hormone ◽  
Locusta Migratoria ◽  
Vitellogenin Synthesis ◽  
Hormone Control

Juvenile hormone-controlled vitellogenin synthesis in Locusta migratoria fat body

1979 ◽  
Vol 69 (1) ◽  
pp. 59-72 ◽  
Author(s):  
Thomas T. Chen ◽  
Pierre Couble ◽  
Randa Abu-Hakima ◽  
Gerard R. Wyatt
Keyword(s):  
Juvenile Hormone ◽  
Fat Body ◽  
Locusta Migratoria ◽  
Vitellogenin Synthesis

Maturation and Responsiveness to Extracts of Corpora Allata from Male Locusta migratoria containing Allatotropic Factors

1992 ◽  
Vol 47 (5-6) ◽  
pp. 449-452 ◽  
Author(s):  
Elisabeth Lehmberg ◽  
Hans-J. Ferenz ◽  
Shalom W. Applebaum
Keyword(s):  
Juvenile Hormone ◽  
Locusta Migratoria ◽  
Corpora Allata ◽  
Basal Rate ◽  
Corpora Cardiaca

Corpora allata (CA) from male Locusta migratoria were tested for their ability to synthesize juvenile hormone (JH) and to respond to stimulating brain/corpora cardiaca (CC) extracts under in vitro conditions. We found that a preincubation of the CA of both sexes at 4 °C for 24 h lowers their basal rate of synthesis and retains their responsiveness to allatotropic factors. Male CA can be stimulated by brain/CC extracts as well as female CA. JH biosynthesis stimulating factors are also present in male brain/CC extracts. Thus such extracts from male locusts can be used for the isolation of locust allatotropin. Furthermore male locust CA are appropriate for bioassaying such allatotropic factors.

The vitellogenin receptor functionality of the migratory locust depends on its phosphorylation by juvenile hormone

2021 ◽  
Vol 118 (37) ◽  
pp. e2106908118
Author(s):  
Yu-Pu Jing ◽  
Xinpeng Wen ◽  
Lunjie Li ◽  
Shanjing Zhang ◽  
Ci Zhang ◽  
...  
Keyword(s):  
Juvenile Hormone ◽  
Periplaneta Americana ◽  
Locusta Migratoria ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Posttranslational Regulation ◽  
Lipoprotein Receptors ◽  
Migratory Locust ◽  
Vitellogenin Receptor ◽  
Oocyte Cytoplasm

Vitellogenin receptor (VgR) plays a pivotal role in ovarian vitellogenin (Vg) uptake and vertical transmission of pathogenic microbes and Wolbachia symbionts. However, the regulatory mechanisms of VgR action as an endocytic receptor and translocation from oocyte cytoplasm to the membrane remain poorly understood. Here, by using the migratory locust Locusta migratoria as a model system, we report that juvenile hormone (JH) promotes VgR phosphorylation at Ser1361 in the second EGF-precursor homology domain. A signaling cascade including GPCR, PLC, extracellular calcium, and PKC-ι is involved in JH-stimulated VgR phosphorylation. This posttranslational regulation is a prerequisite for VgR binding to Vg on the external surface of the oocyte membrane and subsequent VgR/Vg endocytosis. Acidification, a condition in endosomes, induces VgR dephosphorylation along with the dissociation of Vg from VgR. Phosphorylation modification is also required for VgR recycling from oocyte cytoplasm to the membrane. Additionally, VgR phosphorylation and its requirement for Vg uptake and VgR recycling are evolutionarily conserved in other representative insects including the cockroach Periplaneta americana and the cotton bollworm Helicoverpa armigera. This study fills an important knowledge gap of low-density lipoprotein receptors in posttranslational regulation, endocytosis, and intracellular recycling.

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