Document Detail


Apoptosis-related factors (Fas receptor, Fas ligand, FADD) in early tooth development of the field vole (Microtus agrestis).
MedLine Citation:
PMID:  15721145     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Fas (CD95/APO-1) belongs to the TNF receptor (TNFR) family. Fas ligand binding followed by Fas-receptor oligomerisation leads to formation of a death-inducing signal complex starting with recruitment of the Fas-adapter protein (FADD). Components of this initiation complex (Fas, Fas-L, FADD) were correlated with apoptotic cells, detected by specific DNA fragmentation and morphological criteria. Apoptotic cells can be detected throughout the embryonic development of molar teeth. Restricted temporospatial distribution suggests several important roles for apoptosis in tooth morphogenesis. However, the mechanisms employed in dental apoptosis remain unclear. Frontal sections of the field vole at stage 13.5-15.5 of embryonic development were exploited to investigate and correlate location of Fas, Fas-ligand, FADD molecules and apoptosis in developing first molars by immunohistochemistry. During these stages the primary enamel knot appears and is gradually terminated by apoptosis. Initially, apoptotic cells were demonstrated in the most superficial layer of the dental lamina. The number of TUNEL-positive cells expanded from late bud to cap stages. Restricted areas of apoptotic cells were found in the stalk and primary enamel knot. Fas, Fas-L and FADD were co-localised, particularly in the primary enamel knot, and the stalk, correlating with the occurrence of apoptosis in these areas. Fas-L, however, was also found in proliferating parts of the developing tooth germ, such as in the cervical loops. Interestingly, FADD molecules were also observed in areas, where Fas protein was not detected. According to the immunohistochemical data, Fas-mediated signalling may have a triggering or enhancing role in dental apoptosis. This remains to be functionally confirmed.
Authors:
E Matalova; A S Tucker; I Misek
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-12-31
Journal Detail:
Title:  Archives of oral biology     Volume:  50     ISSN:  0003-9969     ISO Abbreviation:  Arch. Oral Biol.     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-02-21     Completed Date:  2005-06-13     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0116711     Medline TA:  Arch Oral Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  165-9     Citation Subset:  D; IM    
Affiliation:
Laboratory of Genetics and Embryology, IAPG, Czech Academy of Sciences, Veveri 97, 602 00 Brno, Czech Republic. matalova@iach.cz
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MeSH Terms
Descriptor/Qualifier:
Animals
Antigens, CD95 / analysis,  metabolism*
Apoptosis / physiology
Arabidopsis Proteins / analysis,  metabolism*
Arvicolinae / embryology*,  metabolism
Enamel Organ / metabolism*
Fatty Acid Desaturases / analysis,  metabolism*
Immunohistochemistry
In Situ Nick-End Labeling
Molar
Odontogenesis / physiology*
Signal Transduction / physiology*
Chemical
Reg. No./Substance:
0/Antigens, CD95; 0/Arabidopsis Proteins; EC 1.14.19.-/Fatty Acid Desaturases; EC 1.14.99.-/Fad7 protein, Arabidopsis

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