Non-specific esterases in partly mineralized bovine enamel

Abstract

Activity for non-specific esterase was demonstrated in the matrix of developing bovine enamel with α-naphthyl acetate and 5-bromoindoxyl acetate as the esterase substrates. By use of high-performance liquid chromatography gel filtration, ion-exchange chromatography, and electrophoresis three esterases were shown to be present in the enamel matrix. The enzymes showed highest activity at pH 6.5–7.5. In sections a strong reaction was observed in the secretory ameloblasts. The esterases may be proteolytic enzymes that participate in the degradation of the matrix proteins.

Key Words:

• Electrophoresis
• enamel matrix
• high-performance liquid chromatography
• histochemistry
• proteolytic enzymes