Abstract
Use of the enkephalinase inhibitor phosphoramidon in the in vitro radiochemical assay for juvenile hormone biosynthesis enhanced allatostatin-mediated inhibition of hormone production by corpora allata of the cockroach,Diploptera punctata. Significant increases in inhibition in day 2 virgin female CA by AST 1 (at 10−7 M) and AST 4 (10−8–10−7 M) were observed in the presence of phosphoramidon (10−5M or greater). No significant increases in inhibition were seen in CA from day 6 mated females with AST 4 (10−9–10−7M) and phosphoramidon combined. Phosphoramidon alone had no effect on JH biosynthesis. Analysis of allatostatin content of the CA, as determined by ELISA, revealed that addition of phosphoramidon to the medium increased the endogenous allatostatin conten in CA of virgin and mated females. The similarity in primary structure between allatostatins and enkephalin-like peptides and their similar distribution makes it probable that phosphoramidon acts by preventing breakdown of allatostatins within the CA.
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Woodhead, A. P., Stay, B., Seidel, S. L., Khan, M. A., and Tobe, S. S., Proc. natl Acad. Sci. USA.86 (1989) 5997.
Stay, B., Joshi, S., and Woodhead, A. P., J. Insect Physiol.36 (1990) 63.
Pratt, G. E., Farnsworth, D. E., Fok, K. F., Siegel, N. R., McCormack, A. L., Shabanowitz, J., Hunt, D. F., and Feyereisen, R., Proc. natl Acad. Sci. USA88 (1991) 2412.
Pratt, G. E., Farnsworth, D. E., and Feyereisen, R., Mol cell. Endocr.70 (1990) 185.
Duve, H., Thorpe, A., and Tobe, S. S., Cell Tissue Res.263 (1991) 285.
Kenny, A. J., in: Proteinases in Mammalian Cells and Tissues, pp. 393–444. Ed. A. J. Barrett. Elsevier/North-Holland Biomedical Press, Amsterdam 1977.
Stay, B., Woodhead, A. P., Joshi, S., and Tobe, S. S., in: Insect Neuropeptides: Chemistry, Biology and Action, pp. 164–176. Eds J. J. Menn, T. J. Kelly and E. P. Masler. ACS Symp. Series453, 1991.
Tobe, S. S., and Pratt, G. E., Biochem. J.144 (1974) 107.
Feyereisen, R., and Tobe, S. S., Analyt. Biochem.111 (1981) 372.
Yu, C. G., Stay, B., Joshi, S., and Tobe, S. S., in preparation.
Matsas, R., Kenny, A. J., and Turner, A. J., Biochem. J.223 (1984) 433.
Martins, M. A., Shore, S. A., Gerard, N. P., Gerard, C., and Drazen, J. M., J. clin. Invest.85 (1990) 170.
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Yagi, K.J., Yu, C.G. & Tobe, S.S. Phosphoramidon enhances allatostatin-mediated inhibition of juvenile hormone biosynthesis in the corpora allta of the cockroach, Diploptera punctata. Experientia 48, 758–761 (1992). https://doi.org/10.1007/BF02124297
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DOI: https://doi.org/10.1007/BF02124297