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Ultraviolet irradiation induces thrombospondin-1 which attenuates type I procollagen downregulation in human dermal fibroblasts
- Source :
-
Journal of Dermatological Science . Jul2010, p16-24. 9p. - Publication Year :
- 2010
-
Abstract
- Abstract: Background: Thrombospondin-1 (TSP-1) is a matricellular glycoprotein and recognized as an inhibitor of angiogenesis and an activator of transforming growth factor-β (TGF-β). Although TSP-1 expression has been shown to be regulated by various stimuli including UV in some types of cell, more work need to be done to understand the regulation of TSP-1 expression and its functional significances in many other types of cell. Objective: In this study, we investigated the effect of UV on TSP-1 expression in human skin dermis and dermal fibroblasts and the role of TSP-1 on the type I procollagen expression after UV exposure. Methods: Human buttock skin and human dermal fibroblasts were irradiated with UV. The mRNA and the protein levels of TSP-1 or type I procollagen were measured by real-time polymerase chain reaction and Western blotting, respectively. Results: We found that UV irradiation increased TSP-1 expression at the mRNA and protein levels in human skin dermis and dermal fibroblasts. UV-induced TSP-1 expression was greatly suppressed by inhibition of the PI3K, Akt, or mTOR pathways. The inhibition of TSP-1 activity by a blocking peptide or suppression of TSP-1 expression by specific TSP-1 small interfering RNA augmented the UV-induced decrease of type I procollagen expression. Conclusion: Our results suggest that UV-induced TSP-1 plays an important role on alleviating and/or recovering the type I procollagen expression downregulated by UV in human dermal fibroblasts. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09231811
- Database :
- Academic Search Index
- Journal :
- Journal of Dermatological Science
- Publication Type :
- Academic Journal
- Accession number :
- 51294584
- Full Text :
- https://doi.org/10.1016/j.jdermsci.2010.04.010