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J. Cell Biol., Volume 141, Number 5, June 1, 1998 1277-1286

Lumican Regulates Collagen Fibril Assembly: Skin Fragility and Corneal Opacity in the Absence of Lumican

Shukti Chakravarti,* Terry Magnuson,Dagger Jonathan H. Lass,§ Karl J. Jepsen,par Christian LaMantia,Dagger and Heidi Carroll*

* Department of Medicine and Genetics, Dagger  Department of Genetics, § Department of Ophthalmology, and par  Department of Orthopaedics, Case Western Reserve University and University Hospitals of Cleveland, Cleveland, Ohio 44106-4952

Lumican, a prototypic leucine-rich proteoglycan with keratan sulfate side chains, is a major component of the cornea, dermal, and muscle connective tissues. Mice homozygous for a null mutation in lumican display skin laxity and fragility resembling certain types of Ehlers-Danlos syndrome. In addition, the mutant mice develop bilateral corneal opacification. The underlying connective tissue defect in the homozygous mutants is deregulated growth of collagen fibrils with a significant proportion of abnormally thick collagen fibrils in the skin and cornea as indicated by transmission electron microscopy. A highly organized and regularly spaced collagen fibril matrix typical of the normal cornea is also missing in these mutant mice. This study establishes a crucial role for lumican in the regulation of collagen assembly into fibrils in various connective tissues. Most importantly, these results provide a definitive link between a necessity for lumican in the development of a highly organized collagenous matrix and corneal transparency.


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