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Related Experiment Videos

Osteogenesis imperfecta: fibronectin in dentin matrix.

P L Lukinmaa1, H Ranta, A Vaheri

  • 1Department of Oral Pathology, University of Helsinki, Finland.

Journal of Craniofacial Genetics and Developmental Biology
|January 1, 1988
PubMed
Summary
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Osteogenesis imperfecta (OI) patients with dentinogenesis imperfecta (DI) showed fibronectin (FN) in dentin. This finding varied across OI types, suggesting genetic differences and potential implications for dentin development in these conditions.

Area of Science:

  • Oral Biology
  • Genetics
  • Biochemistry

Background:

  • Osteogenesis imperfecta (OI) is a group of genetic disorders characterized by bone fragility.
  • Dentinogenesis imperfecta (DI) is a developmental abnormality of the dentin that can occur in conjunction with OI.
  • Fibronectin (FN) is an extracellular matrix glycoprotein involved in cell adhesion and tissue development.

Purpose of the Study:

  • To investigate the presence and pattern of fibronectin (FN) in the dentin matrix of teeth from patients with various types of osteogenesis imperfecta (OI) and dentinogenesis imperfecta (DI).
  • To explore potential correlations between FN distribution, OI subtypes, and the presence of DI.

Main Methods:

  • Teeth from seven OI patients (five types) and three normal controls were analyzed.

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  • Demineralization using ethanolic trimethylammonium EDTA, enzymatic pretreatment, and immunostaining with anti-human plasma fibronectin (FN) sera were performed.
  • Immunohistochemical staining for FN in the dentin matrix was evaluated.

    • Main Results:

    • Positive FN staining in halo and reticular patterns was observed in the dentin matrix of one patient with type I B OI and two patients with type IV B OI, all exhibiting DI.
    • Negative FN staining was found in type I A OI without DI, type III OI, one patient with type IV B OI, and an unidentified OI type, all with DI.
    • Normal control teeth showed no FN staining in the dentin matrix.

    Conclusions:

    • The presence of FN in the dentin matrix of certain OI patients with DI suggests a potential role in the altered dentin development associated with these conditions.
    • Observed variations in FN staining patterns among different OI types, including interfamilial variability in type IV B OI, highlight the genetic heterogeneity of OI syndromes.
    • The presence of FN may result from continuous synthesis or reduced degradation during dentinogenesis in OI.