Retardation of mouse odontoblast differentiation by heparin in vitro.
The effect of heparin was studied histologically and immunohistochemically. Tooth germs from 15-day-old mouse embryos were cultured with or without heparin. After 6 days of culture in control medium, mesenchymal cells underlying the inner enamel epithelium had differentiated into odontoblasts and secreted predentine. In medium with heparin, mesenchymal cells were undifferentiated. In medium with other glycosaminoglycans such as chondroitin sulphate, dermatan sulphate or hyaluronate, tooth germs were similar to those in control medium, as were those in medium with heparin-Sepharose absorbed serum. After 12 days of culture in the heparin medium, mesenchymal cells in some cusps had differentiated into odontoblasts and secreted predentine but in other cusps remained undifferentiated. Immunohistochemically, exogenous heparin did not prevent the deposition of type IV collagen, laminin and fibronectin in the basement membrane and extracellular matrix. These results suggest that exogenous heparin retards differentiation of odontoblasts but not by disruption of the basement membrane nor inactivation of heparin-binding growth factors present in serum.
Sato
E
E
Department of Pathology, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
Kameyama
Y
Y
Maeda
H
H
Fujita
K
K
Takesue
M
M
D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D002809:Chondroitin Sulfates / Q000494:pharmacology; D003094:Collagen / Q000032:analysis; D003771:Dental Papilla / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D003871:Dermatan Sulfate / Q000494:pharmacology; D004658:Enamel Organ / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D004848:Epithelium / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D005353:Fibronectins / Q000032:analysis; D006493:Heparin / Q000494:pharmacology*; D006820:Hyaluronic Acid / Q000494:pharmacology; D007124:Immunoenzyme Techniques; D007797:Laminin / Q000032:analysis; D008648:Mesoderm / Q000187:drug effects / Q000473:pathology / Q000502:physiology; D051379:Mice; D008815:Mice, Inbred Strains; D009804:Odontoblasts / Q000187:drug effects* / Q000473:pathology / Q000502:physiology; D009924:Organ Culture Techniques; D014083:Tooth Germ / Q000187:drug effects* / Q000473:pathology / Q000502:physiology
D005353:Fibronectins; D007797:Laminin; D003871:Dermatan Sulfate; D006820:Hyaluronic Acid; D006493:Heparin; D002809:Chondroitin Sulfates; D003094:Collagen