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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Rhee, Douglas J. Oh, Dong-Jin Kang, Min-Hyung Acott, Ted S. Keller, Kate E. Haddadin, Ramez I. Kelley, Mary J. Yang, Yong-Feng Vranka, Janice A. Sun, Ying Ying |
| Description | Country affiliation: United States Author Affiliation: Keller KE ( Casey Eye Institute, Oregon Health & Science University, Portland, Oregon 97239, USA. gregorka@ohsu.edu) |
| Abstract | PURPOSE: Tenascin C (TNC) is a matricellular glycoprotein whose expression in adult tissue is indicative of tissue remodeling. The purpose of the current study was to determine the localization of TNC in trabecular meshwork (TM) tissue and to analyze the effects of TNC on intraocular pressure (IOP). METHODS: Human TM frontal sections were immunostained with anti-TNC and imaged by confocal microscopy. TNC mRNA and protein levels were quantitated in anterior segments perfused at physiological and elevated pressure. Short, hairpin RNA (shRNA) silencing lentivirus targeting full-length TNC (shTNC) was applied to anterior segment perfusion organ cultures. The IOPs and central corneal thickness (CCT) of wild-type, TNC(-/-), and tenascin X (TNX(-/-)) knockout mice were measured. RESULTS: TNC was distributed in the juxtacanalicular (JCT) region of adult human TM, predominantly in the basement membrane underlying the inner wall of Schlemm's canal. Application of shTNC lentivirus to human and porcine anterior segments in perfusion culture did not significantly affect outflow rate. Although TNC was upregulated in response to pressure, there was no difference in outflow rate when shTNC-silenced anterior segments were subjected to elevated pressure. Furthermore, IOPs and CCTs were not significantly different between TNC(-/-) or TNX(-/-) and wild-type mice. CONCLUSIONS: TNC does not appear to contribute directly to outflow resistance. However, TNC immunolocalization in the JCT of adult human eyes suggests that certain areas of the TM are being continuously remodeled with or without an IOP increase. |
| ISSN | 01460404 |
| e-ISSN | 15525783 |
| DOI | 10.1167/iovs.13-11620 |
| Journal | Investigative Opthalmology & Visual Science |
| Issue Number | 8 |
| Volume Number | 54 |
| Language | English |
| Publisher | Association for Research in Vision and Ophthalmology |
| Publisher Date | 2013-08-19 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Intraocular Pressure Physiology Tenascin Genetics Metabolism Trabecular Meshwork Animals Anterior Eye Segment Cadaver Ciliary Body Extracellular Matrix Gene Silencing Homeostasis Lentivirus Mice Mice, Knockout Organ Culture Techniques Osteonectin Rna, Messenger Sclera Swine Uvea Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't Discipline Ophthalmology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ophthalmology Sensory Systems Cellular and Molecular Neuroscience |
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