PMID: 6963885Jan 1, 1982Paper

Formation of tight junctions in differentiating and secretory ameloblasts of rat molar tooth germs

Archives of Oral Biology
T SasakiS Yoshiki

Abstract

Forty newborn rats were perfused with Karnovsky fixative and the tight junctions in differentiating and secretory ameloblasts were examined by conventional electron microscopy and freeze-fracture replications. Pre-ameloblasts were divided into types I, II and III based on morphology. Initial indications of tight-junction formation appeared as linear aggregations of particles in type II. The apparent tight junctional strands were observed in type III and in secretory ameloblasts. Though the junctional strands were numerous and long, no complete barrier between pre-ameloblasts at their distal ends was present. Complete zonular tight junctions were first observed at the distal ends of secretory ameloblasts; at this stage, proximal tight junctions incompletely sealed the paracellular spaces around the ameloblasts. Throughout their formative processes, the tight junctional strands were engaged in forming gap junctions. The structural features of tight junctions were considered to be closely associated with the cytodifferentiation of ameloblasts and permeability in the ameloblast layer.

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Citations

Jan 1, 1985·The Journal of Membrane Biology·L Gonzalez-MariscalM Cereijido
Jan 2, 2001·Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists·M J Hubbard
Feb 1, 1997·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·T Kawamoto, M Shimizu
May 5, 2017·Physiological Reviews·Rodrigo S LacruzMichael L Paine
Apr 4, 2008·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Tetsuichiro InaiYosaburo Shibata
Dec 1, 1987·Advances in Dental Research·T SasakiP R Garant
Jan 28, 2003·Histochemistry and Cell Biology·Silvia M A João, Victor E Arana-Chavez

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