Journal ArticleDOI
Identification of a juvenile hormone-like compound in a crustacean.
Hans Laufer,David W. Borst,F. C. Baker,C. C. Reuter,L. W. Tsai,David A. Schooley,C. Carrasco,M. Sinkus +7 more
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TLDR
Results indicate that JH-like compounds such as methyl farnesoate have regulatory roles in crustaceans.Abstract:
Juvenile hormone (JH) has central roles in the regulation of insect development and reproduction but has not previously been identified in other arthropod classes. The hemolymph of a crustacean, Libinia emarginata (Leach), has now been analyzed for JH-like compounds. Samples contained 0.003 to 0.030 nanogram of JH III per milliliter and 10 to 50 nanograms of methyl farnesoate per milliliter; methyl farnesoate is a compound structurally related to JH III that has JH bioactivity. Several tissues were examined for synthesis and secretion of JH-like compounds. Of these tissues, only the mandibular organs produced and secreted JH III and methyl farnesoate. However, microchemical analysis revealed that this JH III was racemic, and thus likely an artifactual oxidation product of methyl farnesoate. Secretion of methyl farnesoate was related to reproduction in females, with the highest rates observed in Libinia near the end of the ovarian cycle when oocyte growth and vitellogenesis are greatest. These results indicate that JH-like compounds such as methyl farnesoate have regulatory roles in crustaceans.read more
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Journal ArticleDOI
Reproductive Endocrinology of Female Crustaceans: Perspective and Prospective
TL;DR: This chapter has tried to recapitulate recent developments in molecular advances taken place in the reproduction regulation of crustacea via hormones, opioids, neurotransmitters and other molecules.
Journal ArticleDOI
In vitro methyl farnesoate secretion by mandibular organs isolated from different molt and reproductive stages of the crab Oziotelphusa senex senex
TL;DR: In the freshwater south Indian rice field crab Oziotelphusa senex senex, MO isolated during premolt and vitellogenesis, secreted greater amounts of MF, which indicates that the regulation of the crustacean molt and reproduction is complex and also involves MF, besides steroid (ecdysteroid) and peptide (sinus gland peptide) hormones.
Journal ArticleDOI
Post-Embryonic Transcriptomes of the Prawn Macrobrachium rosenbergii: Multigenic Succession through Metamorphosis
Tomer Ventura,Rivka Manor,Eliahu D. Aflalo,Vered Chalifa-Caspi,Simy Weil,Omri Sharabi,Amir Sagi +6 more
TL;DR: This study exemplifies the applicability of a high-throughput sequencing approach for studying complex traits, including metamorphosis, providing new insight into this unexplored area of crustacean research.
Journal ArticleDOI
Isolation and expression analysis of multiple isoforms of putative farnesoic acid O-methyltransferase in several crustacean species
Anna V Kuballa,Kimberley Guyatt,Bryony Dixon,Hazra Thaggard,Anthony R. Ashton,Brian Paterson,David J. Merritt,Abigail Elizur +7 more
TL;DR: Protein domain analysis revealed the presence of a deduced casein kinase II phosphorylation site present only in the long isoform of putative FaMeT, indicative of a multi-gene family.
Journal ArticleDOI
The effect of seawater composition and osmolality on hemolymph levels of methyl farnesoate in the green crab Carcinus maenas.
Donald L. Lovett,Christopher A. Tanner,Christopher A. Tanner,Krzysztof Glomski,Thomas M. Ricart,Thomas M. Ricart,David W. Borst +6 more
TL;DR: The 6-8 h delay between exposing crabs to dilute sea water and observing an increase in MF appears to reflect the time needed for specific hemolymph ions to decrease below a threshold concentration.
References
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Journal ArticleDOI
The influence of substrate concentrations on the rate of insect juvenile hormone biosynthesis by corpora allata of the desert locust in vitro
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Journal ArticleDOI
Isolation, Structure, and Absolute Configuration of a New Natural Insect Juvenile Hormone from Manduca sexta
TL;DR: Two juvenile hormones are isolated from organ cultures of corpora allata of the tobacco hornworm moth, Manduca sexta Johannson, and are purified by high-resolution liquid chromatography and identified as methyl (2E, 6E)-(10R)-10,11-epoxy-3,7, 11-trimethyl-2,6-dodecadienoate, a new natural hormone.
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