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Chick gonadogenesis following early surgical bursectomy
Authors:Annalena Civinini   Stefania Petrucci  Valentina P. Gallo
Affiliation:(1) Department of Animal and Human Biology, Zoology Laboratories, University "ldquo"La Sapienza"rdquo", Viale dell' Università 32, I-00185 Roma, Italy
Abstract:Left ovaries of bursectomized chick embryos were examined on the 17th day of incubation in comparison to normal and sham-operated controls, by histological and histochemical observations. The results show that in bursectomized embryos the cortex appears irregulary developed, with a significant decrease in the mean thickness and in the percentage of the secondary sex cords in the total cortical area. Furthermore, the germinal epithelium appears thicker and the subcortical medulla and the tunica albuginea more compact. The greater activity of the enzyme Delta5–3beta-hydroxysteroid dehydrogenase (Delta53betaHSD) found in ovaries of bursectomized embryos (histochemical method) could be related to an endocrine dismetabolism affecting the cortical development. On the basis of these results and those of other authors, some hypotheses are advanced. In particular, an action of the bursal factor on GTH receptors could be the factor responsible of the enhanced steroidogenic activity altering the hormonal environment.
Keywords:Chick embryo  Bursa of Fabricius  Left ovary  Morphogenesis  Histochemistry
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