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2014 ; 35
(ä): 103-11
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Interclass small leucine-rich repeat proteoglycan interactions regulate collagen
fibrillogenesis and corneal stromal assembly
#MMPMID24447998
Chen S
; Young MF
; Chakravarti S
; Birk DE
Matrix Biol
2014[Apr]; 35
(ä): 103-11
PMID24447998
show ga
The corneal stroma is enriched in small leucine-rich proteoglycans (SLRPs),
including both class I (decorin and biglycan) and class II (lumican, keratocan
and fibromodulin). Transparency is dependent on the assembly and maintenance of a
hierarchical stromal organization and SLRPs are critical regulatory molecules. We
hypothesize that cooperative interclass SLRP interactions are involved in the
regulation of stromal matrix assembly. We test this hypothesis using a compound
Bgn(-/0)/Lum(-/-) mouse model and single Lum(-/-) or Bgn(-/0) mouse models and
wild type controls. SLRP expression was investigated using immuno-localization
and immuno-blots. Structural relationships were defined using ultrastructural and
morphometric approaches while transparency was analyzed using in vivo confocal
microscopy. The compound Bgn(-/0)/Lum(-/-) corneas demonstrated gross opacity
that was not seen in the Bgn(-/0) or wild type corneas and greater than that in
the Lum(-/-) mice. The Bgn(-/0)/Lum(-/-) corneas exhibited significantly
increased opacity throughout the stroma compared to posterior opacity in the
Lum(-/-) and no opacity in Bgn(-/0) or wild type corneas. In the
Bgn(-/0)/Lum(-/-) corneas there were abnormal lamellar and fibril structures
consistent with the functional deficit in transparency. Lamellar structure was
disrupted across the stroma with disorganized fibrils, and altered fibril
packing. In addition, fibrils had larger and more heterogeneous diameters with an
abnormal structure consistent with abnormal fibril growth. This was not observed
in the Bgn(-/0) or wild type corneas and was restricted to the posterior stroma
in Lum(-/-) mice. The data demonstrate synergistic interclass regulatory
interactions between lumican and biglycan. These interactions are involved in
regulating both lamellar structure as well as collagen fibrillogenesis and
therefore, corneal transparency.