Production and extraovarian processing of vitellogenin in ovariectomized Blattella germanica (L.) (Dictyoptera, Blattellidae)
1996
Martin, D. | Piulachs, M.D. | Bellés, X.
The fat body produces vitellogenic proteins which are released to the haemolymph and incorporated into developing oocytes, where they are processed to vitellins. Endocrine and other physiological cues regulate vitellogenesis in a complex homeostatic pattern, in which the ovary may have a pivotal role. The present paper describes the effects of ovariectomy on vitellogenin production in the cockroach Blattella germanica. The results show that the absence of ovaries leads to a rising and saturable accumulation of vitellogenic proteins, both in the haemolymph and in the fat body, whereas in intact females the production of these proteins is cyclic. This suggests that the ovary is involved in terminating vitellogenesis in intact females. We also report that vitellogenin is processed in the haemolymph of ovariectomized females in a similar manner to that of vitellin in the ovary of intact specimens.
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