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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Isolation and identification in the white shrimp Penaeus vannamei
Pieter Torfs,Julia Nieto,Anja Cerstiaens,Doris Boon,Geert Baggerman,Constantine Poulos,Etienne Waelkens,Rita Derua,Arnold De Loof,Liliane Schoofs +9 more
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HORIZONS Some ideas about the role of lipids in the life cycle of Calanus finmarchicus
TL;DR: In this article, a conceptual model of the possible role of lipids in the life cycle of Calanus finmarchicus is proposed, and a number of ways to test the validity of the proposed hypotheses are proposed.
Methyl farnesoate stimulates gonad development in
TL;DR: Results provide strong evidence that methyl farnesoate is involved in the control of reproduction in prawns and significantly increased mean oocyte diameter and testicular follicle diameter as well as mean ovarian indices and testicle indices, respectively.
Journal ArticleDOI
Eyestalk transcriptome and methyl farnesoate titers provide insight into the physiological changes in the male snow crab, Chionoecetes opilio, after its terminal molt
Kenji Toyota,Takeo Yamamoto,Tomoko Mori,Miyuki Mekuchi,Shinichi Miyagawa,Masaru Ihara,Shuji Shigenobu,Tsuyoshi Ohira +7 more
TL;DR: In this paper , the authors investigated the circulating concentrations of methyl farnesoate (an innate juvenile hormone in decapods) before or after the terminal molt in males and found an increase in MF titers after the fin molt.
Journal ArticleDOI
Specification of the endocrine primordia controlling insect moulting and metamorphosis by the JAK/STAT signalling pathway
Mar García-Ferrés,Carlos Sánchez-Higueras,José Manuel Espinosa-Vázquez,James Castelli-Gair Hombría +3 more
TL;DR: In this article , the expression of a key regulator of early gland development, the snail gene, is controlled by the Dfd and Scr Hox genes and by the Hedgehog and Wnt signalling pathways that induce localised transcription of upd, the ligand of the JAK/STAT signalling pathway.
References
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The influence of substrate concentrations on the rate of insect juvenile hormone biosynthesis by corpora allata of the desert locust in vitro
Stephen S. Tobe,Grahame E. Pratt +1 more
TL;DR: It is proposed that the described method may be usefully employed to assess the physiological changes in the enzymic competence of the glands to effect the last two stages in C(16) juvenile hormone biosynthesis.
Journal ArticleDOI
Endocrine control of reproduction in decapod Crustacea.
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Journal ArticleDOI
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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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