Ultrastructural observation on matrix fibers in the condylar cartilage of the adult rat mandible.

S Shibata, O Baba, M Ohsako, S Suzuki, Y Yamashita, T Ichijo
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Abstract

In this study, ultrastructural and immunohistochemical studies were performed on the adult rat (15 weeks old) mandibular condyle, with particular attention to the matrix fibers in the condylar cartilage. The fibrous zone had thick collagen fibrils which formed fibril bundles. These collagen fibrils consisted mainly of Type I collagen. From the proliferative zone to the mature zone, the density of the collagen fibrils became higher. In the hypertrophic zone, thick collagen fibrils were formed around the chondrocytes. Immunohistochemical study indicated that these collagen fibrils consisted mainly of Type I collagen. Therefore, it was confirmed that the hypertrophic chondrocytes in this tissue had one of the osteoblastic phenotypes.

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成年大鼠下颌骨髁突软骨基质纤维的超微结构观察。
在本研究中,对成年大鼠(15周龄)下颌髁突进行了超微结构和免疫组织化学研究,特别关注髁突软骨中的基质纤维。纤维带有厚的胶原原纤维,形成纤维束。这些胶原原纤维主要由I型胶原组成。从增生区到成熟区,胶原原纤维密度增高。在增生性区,软骨细胞周围形成厚的胶原原纤维。免疫组织化学研究表明,这些胶原原纤维主要由I型胶原组成。因此,证实该组织中的增生性软骨细胞具有成骨细胞表型之一。
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