Chick gonadogenesis following early surgical bursectomy |
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Authors: | Annalena Civinini Stefania Petrucci Valentina P. Gallo |
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Affiliation: | (1) Department of Animal and Human Biology, Zoology Laboratories, University La Sapienza, Viale dell' Università 32, I-00185 Roma, Italy |
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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 5–3-hydroxysteroid dehydrogenase (53HSD) 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. |
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Keywords: | Chick embryo Bursa of Fabricius Left ovary Morphogenesis Histochemistry |
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