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Somatostatin regulates tight junction function and composition in human keratinocytes
Author(s) -
Vockel Matthias,
Breitenbach Ute,
Kreienkamp HansJürgen,
Brandner Johanna M.
Publication year - 2010
Publication title -
experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 96
eISSN - 1600-0625
pISSN - 0906-6705
DOI - 10.1111/j.1600-0625.2010.01101.x
Subject(s) - tight junction , microbiology and biotechnology , somatostatin , epidermis (zoology) , human skin , biology , keratinocyte , claudin , somatostatin receptor , receptor , paracellular transport , barrier function , chemistry , cell culture , endocrinology , biochemistry , anatomy , membrane , permeability (electromagnetism) , genetics
Please cite this paper as: Somatostatin regulates tight junction function and composition in human keratinocytes. Experimental Dermatology 2010; 19 : 888–894. Abstract: Somatostatin (SST) is a regulatory peptide hormone that acts through five different G protein‐coupled receptors (SSTR1‐5). Whereas expression of all five SSTR subtypes in epidermis has been shown, the biological relevance of the SST/SSTR system in the skin is completely unknown. We show here that SST is expressed in human skin and is present in a subset of Merkel cells and dendritic cells as well as in keratinocytes. We focused further on the somatostatin receptor subtype 3 (SSTR3) and its interacting protein MUPP1, as both were found to be localized at cellular junctions in epidermal keratinocytes. MUPP1 is a component of tight junctions (TJs); these cell–cell junctions contribute to barrier function of the paracellular pathway in cultured keratinocytes. We provide evidence that SSTR3 and MUPP1 interact in primary cultured human keratinocytes at high Ca 2+ conditions. Interestingly, SST, presumably via SSTR3/MUPP1, regulates TJ permeability in cultured keratinocytes. During long‐term treatment of human keratinocytes, SST also affects the expression of distinct TJ proteins such as claudin‐4. Our data are the first example of a peptide hormone regulating TJ functionality and composition in human keratinocytes, suggesting that control via peptide hormones provides the possibility to regulate the TJ barrier characteristics of the skin.