Document Detail

Spatial and temporal distribution of Ki-67 proliferation marker, Bcl-2 and Bax proteins in the developing human tooth.
MedLine Citation:
PMID:  20732674     Owner:  NLM     Status:  In-Process    
OBJECTIVE: To investigate the spatial and temporal expression of proliferation Ki-67 marker, pro-apoptotic Bax and anti-apoptotic Bcl-2 proteins during early development of the human tooth.
MATERIALS AND METHODS: Histological sections of eight human conceptuses, 5-10 postovulatory weeks old, were used for immunolocalization for Ki-67, Bax and Bcl-2 markers. Quantification was performed by calculating the fraction of Ki-67 positive cells, expressed as a mean ± SD, and analysed by Mann-Whitney test, Kruskal-Wallis and Dunn's post hoc test.
RESULTS: In 6th-7th developmental weeks, the tooth germ and dental crest contained 37% of proliferating cells, which increased to 40% in the 8th week, and then decreased to 15% in the 10th week, whilst the proliferation in the ectomesenchyme subsequently dropped from 37% to 23%. Epithelial parts of the enamel organ displayed similar proliferation activity (31-36%), dental crest 10%, whilst enamel knot showed no proliferating activity. The tooth ectomesenchyme contained more proliferating cells (50%) than the jaw ectomesenchyme (35%), and both dropped to 28% in the 10th week. Ectomesenchyme between the tooth germs contained 23%, whilst the jaw ectomesenchyme contained 15% of proliferating cells. Bcl-2 expression had following pattern: strong in proliferating cells, moderate in tooth germs and dental crest, and weak in the ectomesenchyme. Bax co-expressed with Bcl-2 in the tooth germ and dental crest. In the reticulum and inner enamel epithelium Bcl-2 had prevalent expression, whilst Bax prevailed in the outer enamel epithelium and tooth ectomesenchyme.
CONCLUSIONS: Proliferating cells most likely influence growth of the tooth germ, Bcl-2 affects proliferation and differentiation of specific cell lineages, whilst Bax influences process of cell death.
Danijela Kalibović Govorko; Tina Bečić; Katarina Vukojević; Snježana Mardešić-Brakus; Dolores Biočina-Lukenda; Mirna Saraga-Babić
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-22
Journal Detail:
Title:  Archives of oral biology     Volume:  55     ISSN:  1879-1506     ISO Abbreviation:  Arch. Oral Biol.     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0116711     Medline TA:  Arch Oral Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1007-16     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2010 Elsevier Ltd. All rights reserved.
School of Dental Medicine, University of Split, Šoltanska 2, 21000 Split, Croatia.
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