MyD88在UVB诱导的抑制树突细胞活动,T细胞功能和皮肤免疫反应方面发挥着重要作用
Mohammad Asif Sherwani1,2, Carlos Alberto Mier Aguilar1,2, Charlotte McRae2
1Department of Dermatology, University of Alabama at Birmingham, 1670 University Boulevard, VH 566A, Birmingham, AL 35294-0019, USA.
International journal of molecular sciences
|October 16, 2025
概括
缺乏MyD88可以通过保持树突细胞活动和减少调节性T细胞来保护抗UVB诱导的免疫抑制. 这揭示了MyD88在皮肤癌发展中的关键作用.
科学领域:
- 免疫学 免疫学 免疫学
- 皮肤病学 皮肤病学
- 分子生物学分子生物学
背景情况:
- 紫外线B (UVB) 辐射会导致DNA损伤和免疫抑制,促进皮肤致癌.
- 收费类受体 (TLR) 适配器MyD88与UVB诱导的免疫效应有关,但涉及树突细胞 (DC) 和T细胞的机制尚不清楚.
研究的目的:
- 研究MyD88和TRIF在UVB诱导的DC活性和T细胞功能抑制中的作用.
- 阐明MyD88在UVB诱导的皮肤免疫抑制中的特定机制.
主要方法:
- 在MyD88淘汰赛 (MyD88-/-),TRIF淘汰赛 (Trif-/-) 和野生型 (WT) 小鼠中评估UVB诱导的免疫反应.
- 树突细胞 (CD11c+) 和T细胞 (CD4+CD25+Foxp3+Treg) 种群和功能的分析,包括细胞因子的产生 (IL-10,IL-12/23) 和MHCII类表达.
- 对接触过敏反应的评估和MyD88条件淘汰小鼠 (MyD88fl/flXCD11c.Cre) 的使用.
主要成果:
- 与Trif-/-和WT小鼠相比,MyD88-/-小鼠对UVB诱导的免疫抑制表现出显著的抵抗力.
- 缺乏MyD88减少了UVB诱导的调节性T细胞 (Tregs),并抑制了产生IL-12/23的DCs的抑制.
- MyD88淘汰赛DCs对UVB诱导的MHCII类抗原呈现的减少具有抗性.
结论:
- MyD88是皮肤中UVB诱导的免疫抑制的关键调解者.
- 缺乏MyD88可以通过保持直流功能和减少Treg细胞发育来防止UVB影响.
- 这项研究揭示了UVB诱导的免疫抑制中MyD88介导调节的新型机制.
相关概念视频
T Cell Types and Functions
2.1K
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
2.1K
Role of Skin in Vitamin D Synthesis
7.5K
The skin plays a crucial role in the synthesis of vitamin D, a vital nutrient for various physiological processes in the body. Vitamin D is unique because it can be synthesized in the skin through a series of chemical reactions triggered by exposure to ultraviolet B (UVB) radiation from sunlight.
The solar UV B rays (290-315 nm) are absorbed by the skin, and 7-dehydrocholesterol (provitamin D3) photolyzes it to previtamin D3, which undergoes a rapid transformation to vitamin...
The solar UV B rays (290-315 nm) are absorbed by the skin, and 7-dehydrocholesterol (provitamin D3) photolyzes it to previtamin D3, which undergoes a rapid transformation to vitamin...
7.5K
T Cell Activation and Clonal Selection
14.7K
T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Naive T cells that have not yet encountered an antigen express two primary CD...
14.7K
Antigens Involved in Adaptive Immunity
1.3K
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and...
Complete Antigens
Complete antigens possess both immunogenicity and...
1.3K
Immune Response Against Viral Pathogens
1.7K
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
1.7K
B Cell Activation and Differentiation
15.9K
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
15.9K


