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Journal of Dental Research
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Modification of Amino Acid Residues in Carious Dentin Matrix

G.A. Kleter

Department of Cariology-Endodontology-Pedodontology, Academic Center for Dentistry Amsterdam (ACTA), Louwesweg 1, NL-1066 EA Amsterdam, Netherlands

J.J.M. Damen

Department of Cariology-Endodontology-Pedodontology, Academic Center for Dentistry Amsterdam (ACTA), Louwesweg 1, NL-1066 EA Amsterdam, Netherlands

M.J. Buijs

Department of Cariology-Endodontology-Pedodontology, Academic Center for Dentistry Amsterdam (ACTA), Louwesweg 1, NL-1066 EA Amsterdam, Netherlands

J.M. Ten Cate

Department of Cariology-Endodontology-Pedodontology, Academic Center for Dentistry Amsterdam (ACTA), Louwesweg 1, NL-1066 EA Amsterdam, Netherlands

The Maillard reaction between sugar and protein has been postulated as the cause for the browning and arrestment of caries lesions. This reaction has been implicated as the cause for decreased degradability of collagen in vivo. The aim of the present study was to verify the occurrence of the reaction in vivo. Carious and sound dentin samples were taken from extracted human teeth and analyzed for the fluorescence characteristic of the Maillard reaction and oxidation and, by HPLC, for Maillard products. In addition, physiological cross-links were analyzed by HPLC. Oxidation- and Maillard reaction-related fluore-scence increased in collagenase digests from carious dentin. Advanced Maillard products (carboxymethyllysine and pentosidine) increased, whereas furosine, a marker for the initial reaction, was not observed consistently. This implies no direct addition of sugars to protein, but rather the addi-tion of smaller metabolites and glycoxidation products. In addition, the physiological crosslinks hydroxylysinonorleucine and dihydroxylysinonorleucine decreased in carious dentin. Also for hydroxylysylpyridinoline, a decrease was observed, but not consistently. In conclusion, the caries process modifies amino acids in dentin collagen, which can lead to increased resistance against proteolysis and ulti-mately to caries arrestment.

Key Words: Maillard reaction • physiological cross-links • dentin • caries.

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Journal of Dental Research, Vol. 77, No. 3, 488-495 (1998)
DOI: 10.1177/00220345980770030801
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