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Phenotypic Profiling and Activation-Associated Expression of CD99 Ligands on Human Leukocytes
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Phenotypic Profiling and Activation-Associated Expression of CD99 Ligands on Human Leukocytes
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Journal Article
Phenotypic Profiling and Activation-Associated Expression of CD99 Ligands on Human Leukocytes
2025
Overview
The immune system comprises a complex network of cells that continuously change during activation, infection, and the maintenance of balance. Immunophenotyping offers valuable insights into the regulation of immune responses. We systematically characterized the expression profile of CD99 ligands across distinct immune cell subsets using both conventional and high-dimensional flow cytometry. CD99 ligands were detected on NK cells and monocytes under both resting and IL-2-activated conditions, with non-classical monocytes and CD56 Dim NK cells exhibiting the highest expression levels. Notably, ligand expression in these subsets was further enhanced following IL-2 activation. In contrast, T lymphocytes (CD3+) displayed low basal levels of CD99 ligand expression, which increased modestly upon activation. Cellular activation was accompanied by an expansion of specific immune phenotypes characterized by elevated CD99 ligand expression alongside the upregulation of activation markers such as CD69 and CD137. Collectively, these findings suggest that the expression of the CD99 ligands may serve as an indicator of immune activation and demonstrate subset-specific regulation, particularly in response to IL-2 stimulation. These findings have revealed the distinct expression patterns of CD99 ligands, emphasizing their crucial role in modulating immune responses.
Publisher
MDPI AG,Multidisciplinary Digital Publishing Institute (MDPI)
Subject
