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Cell proliferation and apoptosis in the fusion of human primary and secondary palates.
MedLine Citation:
PMID:  22813218     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The markers of cell proliferation (Ki-67) and apoptosis [caspase-3, TdT-mediated biotin-dUTP nick-end labelling (TUNEL)] and the expression of syndecan-1 and heat shock protein 70 (Hsp70) were analyzed immunohistochemically in 11 developing human palates, from developmental weeks 6 to 10. During fusion of the primary palate, the proportion of proliferating cells decreased from 42 to 32% and the proportion of apoptotic cells decreased from 11 to 7% in the medial-edge epithelium. At later stages, the proportions of both types of cells decreased in the ectomesenchyme, except for proliferating cells in its non-condensing part. At developmental weeks 9-10, the epithelial seam in the secondary palate comprised 28% proliferative cells and 5% apoptotic cells. While condensing ectomesenchyme contained more apoptotic cells than proliferating cells, the opposite was observed for the non-condensing ectomesenchyme. Co-expression of syndecan-1 and Hsp70 was detected in cells budding from the epithelial seam. Our study indicates similar principles for human primary palate and secondary palate fusion, and parallel persistence of proliferation and apoptotic activity. While proliferation enables growth and fusion of different palatal primordia, apoptosis results in the removal of of large numbers epithelial cells at the fusion point. The disintegration of seam remnants seems to be executed through the processes of change in protein content and cell migration, probably leading to cell death as their final outcome.
Authors:
Katarina Vukojevic; Darko Kero; Josip Novakovic; Danijela Kalibovic Govorko; Mirna Saraga-Babic
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Publication Detail:
Type:  Journal Article     Date:  2012-06-25
Journal Detail:
Title:  European journal of oral sciences     Volume:  120     ISSN:  1600-0722     ISO Abbreviation:  Eur. J. Oral Sci.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-07-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9504563     Medline TA:  Eur J Oral Sci     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  283-91     Citation Subset:  D; IM    
Copyright Information:
© 2012 Eur J Oral Sci.
Affiliation:
Department of Anatomy, Histology and Embryology, School of Medicine, University of Split, Split, Croatia.
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