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Keratan sulfate and dermatan sulfate proteoglycans associate with type VI collagen in fetal rabbit cornea
T Takahashi, HI Cho, CL Kublin and C Cintron
Schepens Eye Research Institute, Harvard Medical School, Boston, Massachusetts.
Keratan sulfate proteoglycan (KSPG) and dermatan sulfate proteoglycan (DSPG) are associated with collagen fibrils in adult rabbit cornea. Because certain cytochemical data suggested that proteoglycans are associated with type VI collagen in the fetal rabbit cornea, we developed polyclonal antibodies specific to the core proteins of rabbit corneal KSPG (lumican and/or fibromodulin) and DSPG (decorin and/or biglycan) and used the antibodies as immunocytochemical probes to determine proteoglycan ultrastructural location. Immunogold particles were associated with Type VI collagen filaments but not with collagen fibrils in fetal and neonate rabbit cornea. Association of corneal KSPG and DSPG with Type VI collagen was immunocytochemically confirmed with monoclonal antibodies to low-sulfated keratan sulfate glycosaminoglycan (GAG) and chondroitin-4-sulfate GAG of DSPG. The monospecificity of the polyclonal and monoclonal antibodies and exclusive binding of antibodies to Type VI collagen filaments, together with previous chemical identification of low-sulfated KSPG and DSPG in developing rabbit cornea, support our contention that corneal proteoglycans in developing rabbit cornea are associated with Type VI collagen.
Volume 41,
Issue 10,
pp. 1447-1457,
10/01/1993
Copyright © 1993 by The Histochemical Society
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