Epigenetic modifications in thymic epithelial cells: an evolutionary perspective for thymus atrophy.
Cexun Hu1,2, Keyu Zhang1,2, Feng Jiang1,2
1Department of Immunology, School of Medicine, Jiangsu University, Zhenjiang, 212013, Jiangsu, People's Republic of China.
Clinical Epigenetics
|November 25, 2021
Summary
Aging causes thymus involution, reducing T cell output and immune response. Epigenetic changes in thymic epithelial cells drive this atrophy, offering potential therapeutic targets for immune rejuvenation in the elderly.
Area of Science:
- Immunology
- Aging Research
- Epigenetics
Background:
- The thymic microenvironment, crucial for T lymphocyte development, comprises epithelial cells and secreted factors.
- Thymus involution begins early in life, leading to reduced naive T cell output, limited T cell receptor diversity, and impaired immune responses.
- Age-related thymus atrophy compromises adaptive immunity against infections and tumors, increasing susceptibility to autoimmune diseases.
Purpose of the Study:
- To review the role of senescent thymic epithelial cells in age-related thymus atrophy.
- To explore how epigenetic modifications influence thymic epithelial cell senescence and function.
- To discuss the impact of thymic adipose tissue on thymic epithelial cell dysfunction and potential therapeutic strategies for thymus atrophy.
Main Methods:
- Review of epigenetic mechanisms including histone modification, DNA methylation, and non-coding RNA effects.
- Analysis of the interplay between thymic epithelial cells, adipose tissue, and thymus involution.
- Exploration of therapeutic prospects targeting thymic epithelial cells for immune rejuvenation.
Main Results:
- Epigenetic modifications are key regulators of thymic epithelial cell development and senescence.
- Senescent thymic epithelial cells contribute significantly to age-related thymic atrophy.
- Thymic adipose tissue influences thymic epithelial cell dysfunction.
Conclusions:
- Epigenetic modifications play a critical role in regulating thymic epithelial cell senescence.
- Targeting thymic epithelial cells offers potential therapeutic strategies to combat thymus atrophy.
- Re-establishing effective thymopoiesis can rejuvenate immune function in the elderly.
Related Concept Videos
01:37Epigenetic Regulation
3.2K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
3.2K
02:32Exon Recombination
3.7K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.7K
03:17Inheritance of Chromatin Structures
6.8K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.8K