Abstract
By using enzyme immunoassay techniques we have quatified the ovarian ecdysteroids during the 7-day cycle of oöcyte maturation in Blattella germanica. Immunoreactive ecdysteroid levels were low on days 0–2, increased to higher values on days 3–6, and peaked on day 7 (about 5 ng of 20-hydroxyecdysone equivalents per pair of ovaries). The predominant non-conjugated ovarian ecdysteroid detected by HPLC analysis was 20-hydroxyecdysone. During oöcyte maturation, the dynamics of patency, vitellogenin uptake, increase in follicle cells diameter (suggested to be due to polyploidy), and choriogenesis was studied. A comparison of the ovarian ecdysteroid profile with the succession of physiological processes occurring within the oöcyte maturation cycle suggests that these hormones could be directly or indirectly involved in the control of patency, polyploidy and choriogenesis in the follicle cells.
Published Version
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