Bystander CD4(+)T cells: crossroads between innate and adaptive immunity
- Title
- Bystander CD4(+)T cells: crossroads between innate and adaptive immunity
- Author
- 최제민
- Keywords
- REGULATORY T-CELLS; TOLL-LIKE RECEPTORS; MEMORY CD4(+); IFN-GAMMA; IN-VIVO; FAMILY CYTOKINES; CUTTING EDGE; HELPER-CELLS; T(H)17 CELLS; STIMULATION
- Issue Date
- 2020-08
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- EXPERIMENTAL AND MOLECULAR MEDICINE, v. 52, no. 8, page. 1255-1263
- Abstract
- T cells are the central mediators of both humoral and cellular adaptive immune responses. Highly specific receptor-mediated clonal selection and expansion of T cells assure antigen-specific immunity. In addition, encounters with cognate antigens generate immunological memory, the capacity for long-term, antigen-specific immunity against previously encountered pathogens. However, T-cell receptor (TCR)-independent activation, termed "bystander activation", has also been found. Bystander-activated T cells can respond rapidly and secrete effector cytokines even in the absence of antigen stimulation. Recent studies have rehighlighted the importance of antigen-independent bystander activation of CD4(+)T cells in infection clearance and autoimmune pathogenesis, suggesting the existence of a distinct innate-like immunological function performed by conventional T cells. In this review, we discuss the inflammatory mediators that activate bystander CD4(+)T cells and the potential physiological roles of these cells during infection, autoimmunity, and cancer.
Immunology: bystander helper T cells in health and disease Immune cells that become activated in the absence of antigen stimulation could be harnessed in the fight against infection, autoimmunity, and cancer. Je-Min Choi and colleagues from Hanyang University in Seoul, South Korea, review how the immune system can deploy helper T cells through an unusual process called bystander activation. Most T cells become activated only after receptors on their surface bind to specific cognate antigen. In contrast, bystander T cells are activated non-specifically in response to cytokines and other pro-inflammatory mediators. Studies have shown that this cell population has a variety of protective and pathogenic functions, for example, guarding against multiple sclerosis, aggravating the symptoms of parasitic infections and promoting antitumor immunity. A better understanding of these immune cells could lead to new therapeutic options for these diseases.
- URI
- https://www.nature.com/articles/s12276-020-00486-7https://repository.hanyang.ac.kr/handle/20.500.11754/169858
- ISSN
- 1226-3613; 2092-6413
- DOI
- 10.1038/s12276-020-00486-7
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > LIFE SCIENCE(생명과학과) > Articles
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