期刊
MOLECULAR IMMUNOLOGY
卷 44, 期 13, 页码 3317-3323出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.molimm.2007.02.023
关键词
MyD88; cytokines; MAPK; cell signaling
资金
- NIAMS NIH HHS [P30 AR050948] Funding Source: Medline
- NIGMS NIH HHS [R01 GM037127, R01 GM037127-22, GM37127] Funding Source: Medline
Trauma-hemorrhage produces immunodepression in males but not in proestrus females and this difference is due to the presence of high estrogen in proestrus females. Although skin is the largest immunological organ of the body and is considered the first line of defense, no study to-date has examined whether trauma-hemorrhage has any effects on keratinocytes which are the major epidermal cell type (> 90%) of skin. We therefore examined whether epidermal keratinocytes inflammatory response and the signal transduction pathways involved in the inflammatory response are altered following trauma-hemorrhage. C3H/HeN mice were subjected to trauma-hemorrhage and 2 h thereafter; keratinocytes were harvested and stimulated with LPS for 24h (5 mu g/ml). Inflammatory mediators, Toll-like receptor (TLR) and myeloid differentiation adaptor protein (MyD88) expression, and the activation of mitogen-activated protein kinase (MAPK) were determined. Trauma-hemorrhage increased the production of IL-6, IL-10, IL-12 and TNF-alpha enhanced the expression of TLR4, MyD88 as well as the activation of MAPK proteins (p38, ERK and JNK) in epidermal keratinocytes. However, administration of a single dose of 17 beta-estradiol following trauma-hemorrhage prevented the increase in these inflammatory parameters under those conditions. These findings suggest that 17 beta-estradiol normalizes epidermal keratinocytes inflammatory responses following trauma-hemorrhage by preventing the upregulation of TLR4-mediated MAPK activation. (c) 2007 Elsevier Ltd. All rights reserved.
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