Journal
JOURNAL OF VETERINARY MEDICAL SCIENCE
Volume 77, Issue 11, Pages 1385-1389Publisher
JAPAN SOC VET SCI
DOI: 10.1292/jvms.15-0015
Keywords
dermatan sulfate; plasma TGF-beta 1 level; Zip13-KO mouse
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Funding
- Grants-in-Aid for Scientific Research [26462324] Funding Source: KAKEN
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Ehlers-Danlos syndrome (EDS) is a group of disorders caused by abnormalities that are identified in the extracellular matrix. Transforming growth factor-beta 1 (TGF-beta 1) plays a crucial role in formation of the extracellular matrix. It has been reported that the loss of function of zinc transporter ZRT/IRT-like protein 13 (ZIP13) causes the spondylocheiro dysplastic form of EDS (SCD-EDS: OMIM 612350), in which dysregulation of the TGF-beta 1 signaling pathway is observed, although the relationship between the dermis abnormalities and peripheral TGF-beta 1 level has been unclear. We investigated the characteristics of the dermis of the Zip13-knockout (KO) mouse, an animal model for SCD-EDS. Both the ratio of dermatan sulfate (DS) in glycosaminoglycan (GAG) components and the amount of collagen were decreased, and there were very few collagen fibrils with diameters of more than 150 nm in Zip13-KO mice dermis. We also found that the TOF-beta 1 level was significantly higher in Zip13-KO mice serum. These results suggest that collagen synthesis and collagen fibril fusion might be impaired in Zip13-KO mice and that the possible decrease of decorin level by reduction of the DS ratio probably caused an increase of free TGF-beta 1 in Zip13-KO mice. In conclusion, skin fragility due to defective ZIP13 protein may be attributable to impaired extracellular matrix synthesis accompanied by abnormal peripheral TGF-beta homeostasis.
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