Odontoblast transport of sulphate - the in vitro influence of fluoride
Milan, A. M., Waddington, Rachel J., Smith, P. M. and Embery, G. 2003. Odontoblast transport of sulphate - the in vitro influence of fluoride. Archives of Oral Biology 48 (5) , pp. 377-387. 10.1016/S0003-9969(03)00016-5
Official URL: http://dx.doi.org/10.1016/S0003-9969(03)00016-5
The present study reports the development of a culture system for the analysis of View the MathML source-sulphate release from odontoblasts in vitro. Pulpless longitudinally split rat incisors were cultured in supplemented minimum essential medium (αMEM) with 20 μCi View the MathML source-sulphate per ml, 20 μCi View the MathML source-mannitol per ml for 1 h. Teeth were then transferred to fresh unlabelled media and aliquots of media were removed and the level of View the MathML source-sulphate View the MathML source-mannitol determined. Results indicated a two phase release of View the MathML source-sulphate into the media, and comparison with pulp tissue indicated a specific release pattern. Transport of sulphate is essential for correct synthesis and glycosylation of macromolecules such as proteoglycans (PG). Previous studies have shown that post-translational modifications of these proteins can be influenced by excess fluoride, resulting in decreased sulphation and elongation of glycosaminoglycan (GAG) chains. Therefore the influence of fluoride on sulphate transport, using the optimised culture system was also investigated. Inclusion of 6 mM fluoride during pulse labelling caused a significant decrease of View the MathML source-sulphate (P<0.0001) during the initial release phase. Inclusion of 3 and 6 mM fluoride only in the post-labelling incubation media resulted in a significant decrease in the release of View the MathML source-sulphate (P<0.0001), during the total time course. The influence of fluoride was not dose dependent. Inclusion of a specific chloride channel blocker SITS, into the culture system indicated that View the MathML source-sulphate transport may in part be via this route. Fluoride would therefore appear to influence the transport of View the MathML source-sulphate across the odontoblast membrane, potentially via a chloride channel.
R Medicine > RK Dentistry
Odontoblast; Sulphate; Proteoglycans; Glycosaminoglycans; Fluoride