By P. D. Evans, V. B. Wigglesworth
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Extra info for Advances in Insect Physiology, Vol. 19
Bishop, C . , O’Shea, M. and Miller, R. J. (1981). Neuropeptide proctolin (H-Arg-Tyr-Leu-Pro-Thr-OH): Immunological detection and neuronal localization in insect central nervous system. Proc. Natl. Acad. Sci. USA 78,5899-5902. Bishop, C. , Wine, J. J. and O’Shea, M. (1984). Neuropeptide proctolin in postural motoneurons of the crayfish. 1. Neurosci. 4,2001-2009. 26 M . O ' S H E A and M . A D A M S Brown, B. E . (1965). Pharmacologically active constituents of the cockroach corpus cardiacum: Resolution and some characteristics.
J H inhibited this process but stimulated other processes, including vitellogenesis (Went, 1978). Ecdysterone and JH are both necessary for the ovariole first to differentiate and then to become capable of functioning, but the two hormones must act separately and successively. This appeared clearly in experiments with Panstrongylus, in which tropharium and vitellarium differentiation in the last instar insect require ecdysterone and are perturbed by JHA application although they require JH later, during the early adult stage (Furtado, 1979).
Another possible origin was proposed for this factor on the basis of experiments with Mamestra, in which spermatogenesis only succeeded in incubated testis when the spermatocysts were cultured in the presence of ruptured testis sheaths or with the sheath incubation medium. The testis wall, which includes both the peritoneal sheath and follicle epithelium, was INSECT REPRODUCTION 43 proposed as the site of origin of this macromolecular factor, (Shimizu and Yagi, 1978). Indeed, in Mamestra, disc electrophoretic analysis of testis homogenates and of the incubation medium after culture of the ruptured testes for 6 days, subsequently revealed two major proteins which might originate from the testis wall and intervene in spermiogenesis (Shimizu and Yagi, 1982).