Abstract
1. The influence of three diphosphonates, ethane-1-hydroxy 1.1 diphosphonate (EHDP), methane-diphosphonate (MDP) and dichloromethane diphosphonate (Cl2MDP) on the inorganic alkaline pyrophosphatase activity in hamster molars has been investigated. All three diphosphonates inhibit the enzyme activity. 2. The inhibition by the three diphosphonates appears to be primarily due to their complexation with a bivalent cation which is not Mg2+, and which acts as a cofactor for the enzyme. 3. For the diphosphonate EHDP, the inhibition is, moreover, in part due to a competition between MgPP 2−1 and MgEHDP2−.
Résumé
1. L'effet de trois diphosphonates, de l'ethane-1-hydroxy 1.1, diphosphonate (EHDP), de méthane-diphosphonate (MDP) et de dichlorométhane diphosphonate (Cl2MDP) sur l'activité en pyrophosphatase alcaline inorganique a été étudié au niveau des molaires de hamsters. 2. L'inhibition des trois diphosphonates parait surtout liée à leur complexation par un cation bivalent qui n'est pas le Mg2+ et qui agit comme un co-facteur pour l'enzyme. 3. Pour le diphosphonate EHDP, l'inhibition est provoquée partiellement, en outre, par l'antagonisme entre MgPP 2−i et MgEHDP2−.
Zusammenfassung
1. Der Einfluß von 3 Diphosphonaten, nämlich Aethan-1-hydroxy-1,1-Diphosphonate (EHDP), Methandiphosphonat (MDP) und Dichloromethandiphosphonat (Cl2MDP) auf die Aktivität der anorganischen alkalischen Pyrophosphatase in Hamstermolaren wurde untersucht. 2. Die Hemmung durch die 3 Diphosphonate scheint vor allem auf ihre Komplexierung mit einem bivalenten Kation zurückzuführen zu sein, welches nicht Mg2+ ist und als Cofaktor für das Enzym wirkt. 3. Beim EHDP wird die Hemmung zudem teilweise durch eine Kompetition zwischen MgPP 2−i und MgEHDP2− hervorgerufen.
Similar content being viewed by others
References
Fleisch, H.: Role of nucleation and inhibition in calcification. Clin. Orthop. rel. Res.32, 170–180 (1964)
Fleisch, H., Maerki, J., Russell, R. G. G.: Effect of pyrophosphate on dissolution of hydroxyapatite and its possible importance in calcium homeastasis. Proc. Soc. exp. Biol. (N.Y.)122, 317–20 (1966b)
Fleisch, H., Russell, R. G. G., Bisaz, S., Casey, P. A., Mühlbauer, R. C.: The influence of pyrophosphate analogues (diphosphonates) on the precipitation and dissolution of calcium phosphate in vitro and in vivo. Calcif. Tiss. Res.2 (Suppl) 10–11 (1968)
Fleisch, H., Russell, R. G. G., Francis, M. D.: Diphosphonates inhibit hydroxy apatite dissolution in vitro and bone resorption in tissue culture and in vivo. Science162, 1262–64 (1969)
Fleisch, H., Russell, R. G. G., Straumann, F.: Effect of pyrophosphate on hydroxy apatite and its implication in calcium homeostasis. Nature (Lond.)212, 901–3 (1966a)
Francis, M. D.: The inhibition of calcium hydroxy apatite crystal growth by polyphosphonates and polyphosphates. Calcif. Tiss. Res.3, 151–62 (1969)
Kjellstrom, W. A., Bishop, S. H. Methylene diphosphonic acid does not inhibit inorganic pyrophosphatase. Life Sci.9, 943–7 (1970)
Russell, R. G. G., Fleisch, H.: Pyrophosphate, phosphonates and pyrophosphatases in the regulation of calcification and Ca2+ homeostasis. Proc. roy. Soc. Med.63, 875–76 (1970)
Wöltgens, J. H. M., Ahsmann, W.: Determination of orthophosphate in the presence of inorganic pyrophosphate in the assay of inorganic pyrophosphatase activity. Analyt. Biochem.35, 526–29 (1970)
Wöltgens, J. H. M., Bonting, S. L.: Inorganic pyrophosphatase in mineralizing hamster molars. II. Effects of bivalent cations and pH. Calcif. Tiss. Res.13, 143–150 (1973)
Wöltgens, J. H. M., Bonting, S. L., Bijvoet, O. L. M.: Relationship, of inorganic pyrophophatase and alkaline phosphatase activities in hamster molars. Calcif. Tiss. Res.5, 333–43 (1970)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Wöltgens, J.H.M., Bonting, S.L. & Bijvoet, O.L.M. Inorganic pyrophosphatase in mineralizing hamster molars. Calc. Tis Res. 13, 151–157 (1973). https://doi.org/10.1007/BF02015405
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02015405