Melanocyte Hyaluronan Coat Fragmentation Enhances the UVB-Induced TLR-4 Receptor Signaling and Expression of Proinflammatory Mediators IL6, IL8, CXCL1, and CXCL10 via NF-κB Activation
| Autor: | Piia Takabe, Raija Tammi, Riikka Kärnä, Sanna Pasonen-Seppänen, Leena Rauhala, Markku Tammi |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Skin Neoplasms Carcinogenesis Ultraviolet Rays Chemokine CXCL1 Primary Cell Culture Inflammation Dermatology Biochemistry Proinflammatory cytokine 03 medical and health sciences 0302 clinical medicine Hyaluronidase medicine Humans Hyaluronic Acid Molecular Biology Melanoma Cells Cultured Toll-like receptor integumentary system biology Chemistry Interleukin-6 Interleukin-8 Cell Biology Hyaluronan-mediated motility receptor Cell biology Extracellular Matrix carbohydrates (lipids) CXCL1 Chemokine CXCL10 Toll-Like Receptor 4 Hyaluronan synthase 030104 developmental biology Hyaluronan Receptors 030220 oncology & carcinogenesis TLR4 biology.protein Melanocytes medicine.symptom Epidermis Hyaluronan Synthases medicine.drug Signal Transduction |
| Zdroj: | The Journal of investigative dermatology. 139(9) |
| ISSN: | 1523-1747 |
| Popis: | Skin is constantly exposed to UVR, the most critical risk factor for melanoma development. Hyaluronan is abundant in the epidermal extracellular matrix and may undergo degradation by UVR. It is hypothesized that an intact hyaluronan coat around the cells protects against various agents including UVR, whereas hyaluronan fragments promote inflammation and tumorigenesis. We investigated whether hyaluronan contributes to the UVB-induced inflammatory responses in primary melanocytes. A single dose of UVB suppressed hyaluronan secretion and the expression of hyaluronan synthases HAS2 and HAS3, the hyaluronan receptor CD44, and the hyaluronidase HYAL2, as well as induced the expression of inflammatory mediators IL6, IL8, CXCL1, and CXCL10. Silencing HAS2 and CD44 partly inhibited the inflammatory response, suggesting that hyaluronan coat is involved in the process. UVB alone caused little changes in the coat, but its removal with hyaluronidase during the recovery from UVB exposure dramatically enhanced the surge of these inflammatory mediators via TLR4, p38, and NF-κB. Interestingly, exogenous hyaluronan fragments did not reproduce the inflammatory effects of hyaluronidase. We hypothesize that the hyaluronan coat on melanocytes is a sensor of tissue injury. Combined with UVB exposure, repeated injuries to the hyaluronan coat could maintain a sustained inflammatory state associated with melanomagenesis. |
| Databáze: | OpenAIRE |
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