Document Detail


Ultrastructural changes in the follicular epithelium of Ceratophrys cranwelli previtellogenic oocytes.
MedLine Citation:
PMID:  17637109     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In this work we carried out ultrastructural, autoradiographic and biochemical analyses of the follicular epithelium during C. cranwelli previtellogenesis. This study revealed that the follicular epithelium in early previtellogenesis is constituted of a single layer of squamous homogeneous cells. During mid-previtellogenesis two types of cells develop: dark cells and clear cells. The follicular dark cells are actively involved in the synthesis of RNA, which is transferred to the oocyte through the interface. In late previtellogenesis the dark cells show apoptotic characteristics such as chromatin condensation, DNA fragmentation and cytoplasm shrinkage. This process forms apoptotic bodies that seem to be engulfed by the oocyte. Our results show evidence that, during mid- and late C. cranwelli previtellogenesis, the follicular epithelium undergoes remodelling processes interacting with the oocyte.
Authors:
E I Villecco; M E Mónaco; S S Sánchez
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Zygote (Cambridge, England)     Volume:  15     ISSN:  0967-1994     ISO Abbreviation:  Zygote     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-07-19     Completed Date:  2007-10-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9309124     Medline TA:  Zygote     Country:  England    
Other Details:
Languages:  eng     Pagination:  273-83     Citation Subset:  IM    
Affiliation:
Departamento de Biología del Desarrollo, Instituto Superior de Investigaciones Biológicas, Consejo Nacional de Investigaciones Científicas y Técnicas y Universidad Nacional de Tucumán, Chacabuco 461, 4000, San Miguel de Tucumán, Tucumán, Argentina.
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MeSH Terms
Descriptor/Qualifier:
Animals
Anura
Epithelium / ultrastructure
Female
Microscopy, Electron, Transmission
Oocytes / ultrastructure*
Ovarian Follicle / ultrastructure*
Vitellogenesis*

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