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Acta Odontologica Scandinavica Volume 33, 1975 - Issue 3
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Original Article

Inorganic pyrophosphatase in isolated enamel organ and odontoblasts from the rat incisor

Håkan Fredén Departments of Pedodontics Histology and Oral Histopathology, and Laboratory of Oral Biology, University of Gothenburg, Sweden
,
Anders Linde Departments of Pedodontics Histology and Oral Histopathology, and Laboratory of Oral Biology, University of Gothenburg, Sweden
&
Bengt C. Magnusson Departments of Pedodontics Histology and Oral Histopathology, and Laboratory of Oral Biology, University of Gothenburg, Sweden
Pages 143-148 | Received 27 Jan 1975, Published online: 02 Jul 2009
 
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Abstract

The inorganic pyrophosphatase (PPiase) activity was determined by a colorimetric method in the odontoblasts and the parts of the enamel organ related to enamel matrix formation and enamel maturation. The effects on PPi hydrolysis by EDTA, R 8231, urea and heat treatment were found to be almost identical to those reported for nonspecific alkaline phosphatase (APase) in the same tissues. The Mg2r activation curve for PPiasc was also similar. Like those of APase, these characteristics of PPiase activity were identical in the three locations studied. It is suggested that the close similarity in the properties of PPiase and APase is due to activity of the same enzyme, a concept which is in agreement with recent biochemical and histochemical studies of calcification.

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