Abstract
Perlecan, a large, multi-domain, heparan sulfate proteoglycan originally identified in basement membrane, interacts with extracellular matrix proteins, growth factors and receptors, and influences cellular signalling1,2,3,4,5. Perlecan is present in a variety of basement membranes and in other extracellular matrix structures5,6. We have disrupted the gene encoding perlecan (Hspg2) in mice. Approximately 40% of Hspg2–/– mice died at embryonic day (E) 10.5 with defective cephalic development. The remaining Hspg2–/– mice died just after birth with skeletal dysplasia characterized by micromelia with broad and bowed long bones, narrow thorax and craniofacial abnormalities. Only 6% of Hspg2–/– mice developed both exencephaly and chondrodysplasia. Hspg2–/– cartilage showed severe disorganization of the columnar structures of chondrocytes and defective endochondral ossification. Hspg2–/– cartilage matrix contained reduced and disorganized collagen fibrils and glycosaminoglycans, suggesting that perlecan has an important role in matrix structure. In Hspg2–/– cartilage, proliferation of chondrocytes was reduced and the prehypertrophic zone was diminished. The abnormal phenotypes of the Hspg2–/– skeleton are similar to those of thanatophoric dysplasia (TD) type I, which is caused by activating mutations in FGFR3 (refs 7, 8, 9), and to those of Fgfr3 gain-of-function mice10,11. Our findings suggest that these molecules affect similar signalling pathways.
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Acknowledgements
We thank G. Longenecker for blastocyst injection; W. Swaim, N. Marinos, V. Morgan, L. Bowers and R. Yaskovich for histology and electron microscopy; M. Mankani for Faxitron radiographs; J. Sasse for Fgf1 antibody; C. Deng for Fgfr3 cDNA; A. McMahon for Ihh cDNA; G. Lunstrum and N. Morris for collagen X antibody; A. Kulkarni, S. Kimura, T. Oshima, M. Hirasawa and K. Kimata for technical comments; and H. Kleinman for critically reading the manuscript. Some of this work was supported by a grant from Seikagaku Corporation.
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Arikawa-Hirasawa, E., Watanabe, H., Takami, H. et al. Perlecan is essential for cartilage and cephalic development. Nat Genet 23, 354–358 (1999). https://doi.org/10.1038/15537
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DOI: https://doi.org/10.1038/15537
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