Abstract
Deficiency of the extracellular matrix protein tenascin-X (TNX) causes a recessive form of Ehlers‐Danlos syndrome (EDS) characterized by hyperextensible skin and hypermobile joints. It is not known whether the observed alterations of dermal collagen fibrils and elastic fibers in these patients are caused by disturbed assembly and deposition or by altered stability and turnover. We used biophysical measurements and immunofluorescence to study connective tissue properties in TNX knockout and wild-type mice. We found that TNX knockout mice, even at a young age, have greatly disturbed biomechanical properties of the skin. No joint abnormalities were noted at any age. The spatio-temporal expression of TNX during normal mouse skin development, during embryonic days 13–19 (E13–E19), was distinct from tropoelastin and the dermal fibrillar collagens type I, III, and V. Our data show that TNX is not involved in the earliest phase (E10–E14) of the deposition of collagen fibrils and elastic fibers during fetal development. From E15 to E19, TNX starts partially to colocalize with the dermal collagens and elastin, and in adult mice, TNX is present in the entire dermis. In adult TNX knockout mice, we observed an apparent increase of elastin. We conclude that TNX knockout mice only partially recapitulate the phenotype of TNX-deficient EDS patients, and that TNX could potentially be involved in maturation and/or maintenance of the dermal collagen and elastin network.
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Acknowledgements
The authors acknowledge the assistance of Dirk J. Faber and Ton G. van Leeuwen of the Laser Center at the Academic Medical Center, Amsterdam, with the optical coherence tomography measurements.
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Egging, D.F., van Vlijmen, I., Starcher, B. et al. Dermal connective tissue development in mice: an essential role for tenascin-X. Cell Tissue Res 323, 465–474 (2006). https://doi.org/10.1007/s00441-005-0100-5
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DOI: https://doi.org/10.1007/s00441-005-0100-5