JDR JDR Most Cited Articles
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Arzate, H.
Right arrow Articles by Ximenez-Fyvie, L. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Arzate, H.
Right arrow Articles by Ximenez-Fyvie, L. A.

Journal of Dental Research, Vol 79, 28-34, Copyright © 2000 by International & American Associations for Dental Research Online Journals

ARTICLES

Electron microscopy, micro-analysis, and X-ray diffraction characterization of the mineral-like tissue deposited by human cementum tumor-derived cells

H. Arzate, M. A. Alvarez-Perez, O. Alvarez-Fregoso, A. Wusterhaus-Chavez, J. Reyes-Gasga and L. A. Ximenez-Fyvie
Division de Estudios de Posgrado e Investigacion, Facultad de Odontologia, UNAM, Mexico DF. harzate@servidor.unam.mx

The nature and characteristics of the mineralized-like tissue deposited by cementoblasts are not well-known due to the difficulties in obtaining and culturing cells representing the cementum phenotype. We hypothesized that a putative cementoblastic cell line derived from a human cementoblastoma could serve as a suitable model to study the physical, chemical, and morphological features of the cementum-like tissue deposited in vitro. The cementoblastoma cell line was studied by transmission electron, high resolution, scanning, and atomic force microscopy and compared with human cellular cementum, human osteoblasts, and human alveolar bone. The analyses of the crystals and mineral-like tissue in the cell line were performed by x-ray diffraction microscopy and energy-dispersive x-ray micro-analysis. TEM examination of cementoblastoma cells revealed the presence of electron-dense intracellular vesicles surrounded by a membrane that contained filaments and needle-like structures. The diffraction patterns obtained from the intracellular material and human cellular cementum were similar, with D-spacings of 3.36 and 2.8, consistent with those of hydroxyapatite (3.440 and 2.814). The composition of the mineral-like tissue had a Ca/P ratio of 1.60 for cementoblastoma cells and 1.97 for human cellular cementum. Na (5.29%) and Cl (1.47%) were present in the composition of cementoblastoma cells. Human cellular cementum additionally contained Mg (4.95%). Osteoblastic cells showed a Ca/P ratio of 1.6280. Na represented 4.52% and Cl 1.22% of its composition. Human alveolar bone had a Ca/P ratio value of 2.01. Na (6.63%), Mg (2.10%), and Cl (0.84%) were also present. All samples examined represented biological-type hydroxyapatite. Based on the compositional and morphological features, these findings indicate that cementoblastoma-derived cells express the human cellular cementum phenotype.


This article has been cited by other articles:


Home page
 J. Dent. Res.Home page
H. Arzate, L.F. Jimenez-Garcia, M.A. Alvarez-Perez, A. Landa, I. Bar-Kana, and S. Pitaru
Immunolocalization of a Human Cementoblastoma-conditioned Medium-derived Protein
J. Dent. Res., August 1, 2002; 81(8): 541 - 546.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
IADR Journals Advances in Dental Research ®
Journal of Dental Research ® Critical Reviews (1990-2004)
Copyright © 2000 Institutional Access Guidelines