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  • 11
    Electronic Resource
    Electronic Resource
    Immunohistochemical Localization of Type I Collagen, Fibronectin and Tenascin C During Embryonic Osteogenesis in the Dentary of Mandibles and Tibias in Rats (2000)
    Springer
    Journal of molecular histology 32 (2000), S. 591-598 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Type I collagen, fibronectin and tenascin C play an important role in regulating early osteoblast differentiation, but the temporal and spatial relationship of their localization during embryonic osteogenesis in vivo is not known. The present study was designed to localize these three molecules in the dentary of mandibles and tibias in rat embryos using immunohistochemistry. Serial paraffin sections were cut and adjacent sections were processed for von Kossa staining or immunohistochemistry for type I collagen, fibronectin and tenascin C. In the dentary, tenascin C was localized within and around the mesenchymal cell condensation in embryos at 14 days in utero. The bone matrix at 15 days showed immunoreactivity for both type I collagen and fibronectin. The immunoreactivity of type I collagen was persistent, whereas that of fibronectin decreased with age of embryos. In tibias, tenascin C was localized in the perichondral mesenchymal tissue at 17 days. Immunoreactivity for type I collagen was persistent in the bone matrix, whereas the tibial bone showed little immunoreactivity for fibronectin at any embryonic age examined. The present study demonstrated characteristic localization of type I collagen, fibronectin and tenascin C during embryonic osteogenesis in the dentary of mandibles and tibias.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026720003564
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  • 12
    Electronic Resource
    Electronic Resource
    Disturbance of the eruption of the first molar and ankylosis of tooth root by HEBP administration in newly born rat (1994)
    Springer
    Journal of bone and mineral metabolism 12 (1994), S. 33-41 
    Details
    ISSN: 1435-5604
    Keywords: HEBP ; Tooth eruption ; Dentin resorption ; Mineralization defect ; Paget's disease of bone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this study, we have investigated the effects of HEBP on alveolar bone remodeling and molar tooth development of new born rats especially with regard to the relation of the mineralization rate and tooth eruption. New born rats (3 to 5 days after birth) were injected with 10 mg/kg body weight HEBP subcutaneously every day except Sunday. Mandibles were investigated radiologically and histologically. The mineralization rate of alveolar bone and dentin was assessed by energy-dispersive X-ray (EDX) analyis. Soft X-ray radiography disclosed the failure of the first molar tooth eruption, and histological findings showed ankylosis of alveolar bone and tooth root, and dentin resorption by multinucleated giant cells. The result of EDX analysis revealed hypo-mineralization of alveolar bone and normal mineralization of dentin. These data suggest that preosteoclasts might be recruited at the site of alveolar bone and tooth germ interface but could not differentiate into bone-resorbing mature osteoclasts because of hypo-mineralization of alveolar bone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02383407
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  • 13
    Electronic Resource
    Electronic Resource
    Subperiosteal lmplantation of octacalcium phosphate (OCP) stimulates both chondrogenesis and osteogenesis in the tibia, but only osteogenesis in the parietal bone of a rat (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 242 (1995), S. 40-46 
    Details
    ISSN: 0003-276X
    Keywords: Octacalcium phosphate ; Implantation ; Long bone ; Calvarium ; Osteogenesis ; Chondrogenesis ; Type I collagen ; Type II collagen ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Background: It is not known whether long bones and calvaria have distinct biological characteristics. Octacalcium phosphate (OCP), which is a precursor phase of the hydroxyapatite, has been reported to stimulate bone formation if implanted in the subperiosteal region of mouse calvaria. The present study was designed to investigate how the long bone and the calvarium respond to OCP implantation and to compare their biological characteristics.Methods: The synthetic OCP was implanted into the subperiosteal region of rat tibiae and parietal bones being mixed with bovine type I collagen treated by pepsin (Atelocollagen). The biological response was examined histologically and immunohistochemically for collagen matrix phenotypes of types I and II to identify bone and cartilage formation.Results: Both chondrogenesis and osteogenesis were initiated in the tibia 1 week after implantation of OCP and most of the cartilage was replaced by bone at week 2. However, the parietal bone did not show osteogenesis responding to OCP implantation until week 3, and no cartilage formation was associated with the osteogenesis.Conclusions: The present study demonstrated the distinct characteristics of biological response to OCP implantation between the long bone and the calvarium in terms of whether or not cartilage formation is involved in the stimulated osteogenesis by OCP, and in terms of timing of the stimulated chondrogenesis and/or osteogenesis, i.e., the parietal bone takes more time to respond to OCP implantation than the tibia. © 1995 Wiley-Liss, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092420106
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  • 14
    Electronic Resource
    Electronic Resource
    Effects of lateral pterygoid muscle hyperactivity on differentiation of mandibular condyles in rats (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 241 (1995), S. 328-336 
    Details
    ISSN: 0003-276X
    Keywords: Mandibular condylar cartilage ; Lateral pterygoid muscle ; Electrical stimulation ; Biomechanical force ; Type I collagen ; Type II collagen ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Background: The effects of biomechanical stress on the growth and development of the mandibular condyle have been studied by many investigators. However, the role of the lateral pterygoid muscle in this development is not clear.Methods: Hyperfunction of the lateral pterygoid muscles of male 3-weekold Sprague-Dawley rats was induced by electrical stimulation, and the responses of the mandibular condyles were compared to control tissues by a double-fluorescent staining technique using polyclonal antibodies against type I and type II collagen. Electrical stimulation consisted of repeated application (5 seconds on/5 seconds off) of a Hz current for up to 7 days.Results: In the first 2 days, cartilaginous tissues rich in type II collagen disappeared in the anterior and posterior areas, which were loaded by tensional force due to direct and indirect attachment of the lateral pterygoid muscles. Tissues in these areas were replaced by intramembranous bone that was reactive for type I collagen at 7 days. By the end of the experiment, the trabecula of the condyle was remodled more perpendicularly, thus resisting the compressive force due to hyperfunction of the lateral pterygoid muscles.Conclusions: These results suggest that the activity of the lateral pterygoid muscle might play a significant role in the differentiation of progenitor cells and in the maturation and calcification of chondrocytes in mandibular condyles. © 1995 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092410306
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  • 15
    Electronic Resource
    Electronic Resource
    BMPs induce direct bone formation in ectopic sites independent of the endochondral ossification in vivo (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 236 (1993), S. 373-380 
    Details
    ISSN: 0003-276X
    Keywords: Cartilage ; Intramembranous ossification ; Collagen ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Bone formation in vivo occurs via two major processes, one of which depends on pre-existing cartilage, and the other does not. Bone morphogenetic proteins (BMPs) have been suggested to induce cartilage formation from non-skeletogenic mesenchymal cell population, which results in osteogenesis through the endochondral sequence. In the present study we examined if BMPs could cause direct bone formation independent of pre-existing cartilage using bovine fibrous collagen membrane (FCM) as a carrier for BMPs. Bovine metatarsal bone was extracted in 4 M guanidine HCl and BMPs were partially purified through the hydroxyapatite chromatography and the Heparin-Sepharose CL6B chromatography. The carrier was loaded with BMPs and then implanted in Wistar rats subcutaneously. The implants were fixed together with surrounding tissue every week after implantation and processed for von Kossa stain, immunohistochemistry, and electron microscopy. The phenotypes of bone and cartilage were identified histologically and immunohistochemically using antibodies against type I and type II collagen. Cartilage and bone were independently induced by 2 weeks. The bone formed directly on the collagen substrate of FCM without pre-existing cartilage. Calcification occurred in the carrier as well as the cartilage and bone matrix. The present study suggests that the BMPs induce osteogenesis in vivo independent of the endochondral sequence. © 1993 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092360211
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  • 16
    Electronic Resource
    Electronic Resource
    The fine structure of the monkey submandibular gland with a special reference to intra-acinar nerve endings (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 131 (1971), S. 185-195 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The secretory terminations of monkey submandibular gland were studied by electron microscopy. The acini are composed of two types of secretory cells which are presumably serous and mucous in type. Myoepithelial cells are present also in the acini. The peri-acinar connective tissue contains many unmyelinated nerve fibers. In some portions, the axons contain many synaptic vesicles of various types. These nerve endings partially lose their Schwann cell investment and reach the acinar basement membrane. In peri-acinar connective tissue two types of nerve endings may be recognized. They are thought to be adrenergic and cholinergic in type. On the other hand, only one type of nerve ending (cholinergic) is observed within the acini. The intra-acinar nerve endings are not surrounded by Schwann cell cytoplasm and make direct contact with plasma membranes of the myoepithelial and mucous cells, with a space about 200 Å wide intervening between the nerve and terminal cell. No nerve endings occur in the interspaces between the serous cells. Also, the ultrastructure of the secretory and myoepithelial cells is described.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001310204
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