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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Hormonal control of ovarian development in the tick Amblyomma hebraeum Koch (Acari: Ixodidae)
TL;DR: Hormonal control of egg development in the ixodid tick Amblyomma hebraeum Koch was investigated as follows: ovaries from small partially fed or fully engorged females were transplanted into the haemocoel of engorges females that were undergoing vitellogenesis; the transplants responded to this milieu by completing oocyte maturation.
Journal ArticleDOI
Drosophila CG10527 mutants are resistant to juvenile hormone and its analog methoprene.
Haiying Zhang,Ling Tian,Stephen S. Tobe,Ying Xiong,Songyan Wang,Xinda Lin,Yanan Liu,William G. Bendena,Sheng Li,Yong Q. Zhang +9 more
TL;DR: Drosophila CG10527 plays little, if any, role in JH biosynthesis but may participate in the JH signaling pathway, and Phenotypic analysis showed thatCG10527 null mutants are fully viable and fertile in both sexes, indicating that CG 10527 is not essential for survival and fertility.
Journal ArticleDOI
Ecdysteroids and juvenoids in two male morphotypes of Libinia emarginata
Hans Laufer,Hans Laufer,Geoffrey Wainwright,N.J. Young,Amir Sagi,Amir Sagi,Jonna S.B. Ahl,Jonna S.B. Ahl,Jonna S.B. Ahl,H.H. Rees +9 more
TL;DR: It appears that ecdysteroids may function early in maturation in unabraded animals by making the gonad competent, while MF may be functioning in mature males with developed reproductive systems and exhibiting mating behavior.
Journal ArticleDOI
Agonist-mediated assembly of the crustacean methyl farnesoate receptor.
TL;DR: Results demonstrated that the Met subunit is highly dynamic in controlling the action of methyl farnesoate through temporal variation in its expression and availability for receptor assembly.
Journal ArticleDOI
Difference in the sensitivity to chemical compounds between female and male neonates of Daphnia magna.
TL;DR: The method of male induction established in this study could be used for screening of endocrine disruptors, and the differences in the median effective concentrations in these compounds between female and male neonates suggest two different overall modes of action.
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
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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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