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      Localization of Elastic Fibers and Elastin mRNA in the Uvea of Chick Embryo

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          The distribution of elastic fibers and elastin mRNA was studied in the uvea of 19-day-old chick embryos by light and electron microscopy and in situ hybridization techniques using a <sup>35</sup>S-labeled RNA probe. Light and electron microscopic examination revealed that elastic fibers were present in the uveal portion of the ciliary body, but not in the posterior choroid. Electron microscopically, elastic fibers were also found in Bruch’s membrane. Abundant amounts of elastin mRNA were strictly localized in the fibroblasts in the uveal portion of the ciliary body, and no elastin mRNA was found in any of the cells in the posterior choroid by in situ hybridization. Cultured uveal tissue obtained from the ciliary body was found to produce large amounts of tropoelastin as compared with cultured posterior choroid. Using V8 protease peptide mapping and Northern blot analysis, the tropoelastin and its mRNA produced by the ciliary body were identical to those produced by the smooth muscle cells in the aorta. The results suggest that elastin is synthesized in the ciliary body, acting as a supporting substance in this area.

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          Author and article information

          Ophthalmic Res
          Ophthalmic Research
          S. Karger AG
          10 December 2009
          : 24
          : 6
          : 344-350
          Departments of aPathology and bDermatology, Keio University School of Medicine, Tokyo; cDepartment of Ophthalmology, National Children’s Hospital, Tokyo, Japan
          267191 Ophthalmic Res 1992;24:344–350
          © 1992 S. Karger AG, Basel

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          Page count
          Pages: 7
          Original Paper

          Vision sciences, Ophthalmology & Optometry, Pathology

          In situ hybridization, Elastin, Uvea, Chick embryo


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