+ Site Statistics
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Regulation of vitellogenin synthesis by juvenile hormone in the corn earworm, Helicoverpa zea

, : Regulation of vitellogenin synthesis by juvenile hormone in the corn earworm, Helicoverpa zea. Invertebrate Reproduction & Development 21(3): 169-178

In the corn earworm Helicoverpa zea yolk deposition in oocytes begins 8-10 h after adult eclosion and is controlled by juvenile hormone (JH). Hemolymph from females at the time of yolk formation, analyzed by SDS-PAGE, contains polypeptides apparently identical to polypeptides from eggs; and these have been tentatively designated as apovitellogenins (apoVgs). ApoVgs were not found in male hemolymph. The hormonal control of production of the apoVg with an apparent molecular weight of 165 kDa (apoVg-I) was studied by SDS-PAGE. Decapitation of females immediately after eclosion did not prevent the appearance of apoVg-I whereas the same operation done 5-7 h prior to eclosion abolished its production. Treatment of the latter group of females with methoprene, a JH analogue, restored production of apoVg-I whereas injection of 20-hydroxyecdysone (20-HE) did not. When pharate adults were kept at 10 degree C from 10-12 h before the time of their anticipated eclosion, eclosion was delayed for 4-7 d. In such females, maintained at the same temperature, apoVg-I appered only on day 3, and its appearance could be accelerated by two days with methoprene treatment immediately after eclosion. Decapitation of chilled females just after eclosion prevented the appearance of apoVg-I even after 16 d at 10 degree C. Likewise, Vg was absent in chilled females decapitated after eclosion and then maintained at room temperature. Methoprene induced apoVg-I production one day after treatment in chilled decapitated females maintained after eclosion either chilled or at room temperature. 20-HE had no effect on these females. Methoprene did not induce Vg in adult males. ApoVg-I of H. zea did not cross-react with Manduca sexta and Plodia interpunctella Vg antibodies. These results demonstrate that Vg synthesis in H. zea is regulated by JH.

(PDF same-day service: $19.90)

Order PDF Full Text


Click here to order any other PDF Full Text

Accession: 002477328

DOI: 10.1080/07924259.1992.9672235

PDF Full Text: Submit

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Other references

Freedman, A.; Neuberg, D.; Kroon, M.; Gribben, J.; Pandite, L.; Soiffer, R.; Mauch, P.; Anderson, K.; Ritz, J.; Nadler, L., 1995: Chop dose intensification with G-CSF in untreated advanced follicular lymphoma patients markedly depletes stem cell reserve for ABMT. Blood 86(10 SUPPL 1): 212A

Kirk, J.; Soffe, R.; Hall, R., 2002: Attitudes and beliefs towards organic meat in the South West of England. Consumer attitudes to meat are shaped by many factors. The dominance of price as a factor affecting food choice is being eroded. Other factors such as origin, convenience, quality, diet and health issues are gaining importance. Consumer beliefs he...

Rathus, J.H.; Miller, A.L., 2002: Dialectical behavior therapy adapted for suicidal adolescents. We report a quasi-experimental investigation of an adaptation of Dialectical Behavior Therapy (DBT) with a group of suicidal adolescents with borderline personality features. The DBT group (n = 29) received 12 weeks of twice weekly therapy consist...

Baba, M.; Takada, H.; Ozaki, I.; Matsunaga, M., 1993: False facilitation to repetitive stimulation. Journal of Neurology, Neurosurgery, and Psychiatry 56(3): 324-325

Tyagi, Suresh, C., 1997: Vasculogenesis and angiogenesis: Extracellular matrix remodeling in coronary collateral arteries and ischemic heart. Heart failure secondary to ischemic cardiomyopathy is the primary cause of cardiovascular mortality. The promise of the collateral circulation lies in its potential to alter the course of the natural history of coronary heart disease. The collater...

Sun, Y.; Hegamyer, G.; Kim, H.; Sithanandam, K.; Li, H.; Watts, R.; Colburn, N.H., 1995: Molecular cloning of mouse tissue inhibitor of metalloproteinase-3 and its promoter. Specific lack of expression in neoplastic JB6 cells may reflect altered gene methylation. A full-length cDNA of mouse tissue inhibitor of metalloproteinase-3 (mTIMP-3) was cloned from a JB6 P+ mouse cell genomic library and sequenced. It was 4591 bp in size and consisted of a 316-bp 5'-end untranslated region, a 636-bp open readin...

Talgorn, E.; de Vries, M.A.; Siebbeles, L.D.A.; Houtepen, A.J., 2011: Photoconductivity enhancement in multilayers of CdSe and CdTe quantum dots. Charge separation at the interface between CdSe and CdTe quantum dots was investigated by comparing the photoconductivity of films consisting of only CdSe or CdTe quantum dots to that of films with alternating layers of CdSe and CdTe quantum dots....

Johansen, J.T.; Hyldig Nielsen, J.J.; Fiandaca, M.J.; Coull, J.M., 2002: Methods, kits and compositions for the identification of nucleic acids electrostatically bound to matrices. This invention pertains to methods, kits and compositions suitable for the detection, identification and/or quantitation of nucleic acids which are electrostatically immobilized to matrices using non-nucleotide probes which sequence specifically h...

Kao, C-Chin.; Wu, V-Cent.; Sun, H-Yun.; Wu, C-Hsiung., 2014: Paradoxical cryptococcal immune reconstitution inflammatory syndrome in advanced chronic kidney disease. Cryptococcal-related immune reconstitution inflammatory syndrome (IRIS) is frequently seen in immunocompromised patients. A 45-year-old man with advanced chronic kidney disease (CKD) received intensive antifungal treatment for pulmonary cryptococc...

Futagi, Y.; Shimizu, H.; Mimaki, T.; Abe, J.; Onoe, S.; Tagawa, T.; Kajiura, I.; Sumi, K.; Yabuuchi, H., 1982: Internal carotid blood flow velocity in children with cerebral palsy by Doppler Ultrasound method. Cerebral blood flow assessed noninvasively by Doppler ultrasound technique in 30 children with cerebral palsy. The average maximal blood velocity (A/L) and end-diastolic blood velocity (d) of internal carotid artery were measured before and during...