Abstract
The skin is the outer layer of protection against the environment. The development and formation of the skin is regulated by several genetic cascades including the bone morphogenetic protein (BMP) signaling pathway, which has been suggested to play an important role during embryonic organ development. Several skin defects and diseases are caused by genetic mutations or disorders. Ichthyosis is a common genetic skin disorder characterized by dry scaly skin. Loss-of-function mutations in the filaggrin (FLG) gene have been identified as the cause of the ichthyosis vulgaris (IV) phenotype; however, the direct regulation of filaggrin expression in vivo is unknown. We present evidence that BMP signaling regulates filaggrin expression in the epidermis. Mice expressing a constitutively active form of BMP-receptor-IB in the developing epidermis exhibit a phenotype resembling IV in humans, including dry flaky skin, compact hyperkeratosis, and an attenuated granular layer associated with a significantly downregulated expression of filaggrin. Regulation of filaggrin expression by BMP signaling has been further confirmed by the application of exogenous BMP2 in skin explants and by a transgenic model overexpressing Noggin in the epidermis. Our results demonstrate that aberrant BMP signaling in the epidermis causes overproliferation and hyperkeratinization, leading to an IV-like skin disease.
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Xueyan Yu and Ramón A. Espinoza-Lewis contributed equally to this work.
This work was supported by grants from the NIH to Y.-P.C.
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Yu, X., Espinoza-Lewis, R.A., Sun, C. et al. Overexpression of constitutively active BMP-receptor-IB in mouse skin causes an ichthyosis-vulgaris-like disease. Cell Tissue Res 342, 401–410 (2010). https://doi.org/10.1007/s00441-010-1077-2
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DOI: https://doi.org/10.1007/s00441-010-1077-2