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Immunoreactivity of Tenascin-C in Dentin Matrix in Dentinogenesis Imperfecta Associated with Osteogenesis Imperfecta

Department of Oral Pathology, Istituto Nazionale per la Ricerca sul Cancro, Viale Benedetto XV 10, 16132 Genoa, Italy

G. Allemanni

Laboratory of Cell Biology, Istituto Nazionale per la Ricerca sul Cancro, Viale Benedetto XV 10, 16132 Genoa, Italy

J. Waltimo

Department of Pedodontics and Orthodontics, Institute of Dentistry, P.O. Box 41, FIN-00014 University of Helsinki, Finland

L. Zardi

Laboratory of Cell Biology, Istituto Nazionale per la Ricerca sul Cancro, Viale Benedetto XV 10, 16132 Genoa, Italy

Osteogenesis imperfecta (01) is a heterogeneous group of heritable connective tissue disorders, assigned to different mutations in type I collagen genes. A variety of structural abnormalities of dentin have been described in dentinogenesis imperfecta (DI) associated with OI. To clarify further the constitution of the dentin matrix in 01, we immunostained frozen and paraffin sections of deciduous teeth from four patients, each from a different family, with two monoclonal antibodies (MAbs) to the matrix glycoprotein tenascin-C (TN-C). One of the MAbs recognizes an epitope common to all TN-C isoforms (BC-4), and the other is specific for a splicing variant (BC-2). Normal teeth, oral mucosa, and skin were analyzed for comparison. Staining patterns with the two MAbs did not differ markedly. Normal dentin matrix and odontoblasts were lacking reactivity, but the pulp stained clearly. TN-C reactivity was present in the dentin matrix of all teeth obtained from two patients with different OI phenotypes and DI, and in one out of three teeth from one patient who also had DI. The reactivity was distributed in layers, but the staining patterns varied from one patient to another and from tooth to tooth. Intratubular staining seen in a tooth from the patient with clinically and histologically normal teeth was comparable with that present in normal deciduous teeth. The variation in TN-C expression suggests that, besides genetic heterogeneity, epigenetic factors could influence the composition of the dentin matrix in OI.

Key Words: human dentin • dentinogenesis imperfecta • osteogenesis imperfecta • tenascin-C • immunohistochemistry

Journal of Dental Research, Vol. 75, No. 1, 581-587 (1996)
DOI: 10.1177/00220345960750011101


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