Development of tight junctions between odontoblasts in early dentinogenesis as revealed by freeze-fracture

Development of tight junctions between odontoblasts in early dentinogenesis as revealed by freeze-fracture

Autor Arana-Chavez, V. E. Google Scholar
Katchburian, Eduardo Autor UNIFESP Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Resumo Background: Mature odontoblasts possess junctional structures constituted by adherens, gap, and tight junctions. Although adherens and gap junctions appear early between odontoblasts, there is no information on the appearance and development of tight junctions between odontoblasts. in this study, we have examined freeze-fracture replicas of early dentinogenesis to study the development of tight junctions between odontoblasts and to determine whether these junctions are of zonular or macular type,Methods: Upper first molar tooth germs of Wistar rats between 1 and 3 days old were fixed in buffered 4% glutaraldehyde/4% formaldehyde and subsequently cryoprotected with cacodylate-buffered glycerol, Freeze-fracture replicas were obtained in a Balzers 301 apparatus, and early stages of dentinogenesis were examined in a Jeol 100 CX II electron microscope,Results: in the stage of early dentine matrix prior to mineralization, odontoblasts exhibit only gap junctions, With the progression of development, the distal plasma membranes of odontoblasts show numerous short tight junctions formed by fused particles and grooves. in the stage of advanced mineralization, branched and continuous rows of fused particles or grooves constitute tight junctions of the focal or macular type,Conclusions: the present study shows that tight junctions of focal or macular type appear on distal plasma membrane of early odontoblasts during differentiation. Formation of tight junctions indicates the establishment of a distal membrane domain and maturation of odontoblasts. These events occur as mantle dentine formation ceases and circumpulpar dentine formation begins. (C) 1997 Wiley-Liss, Inc.
Assunto tight junctions
odontoblast plasma membrane
freeze fracture
Idioma Inglês
Data 1997-07-01
Publicado em Anatomical Record. New York: Wiley-liss, v. 248, n. 3, p. 332-338, 1997.
ISSN 0003-276X (Sherpa/Romeo, fator de impacto)
Editor Wiley-Blackwell
Extensão 332-338
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:A1997XH46900005

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