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KMID : 0923620210210020017
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Immune Network
2021 Volume.21 No. 2 p.17 ~ p.17
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Increase of Vδ2+ T Cells That Robustly Produce IL-17A in Advanced Abdominal Aortic Aneurysm Tissues
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Seo In-Ho
Lee Seung-Jun
Noh Tae-Wook
Kim Jung-Hwan
Joo Hyun-Chel
Shin Eui-Cheol
Park Su-Hyung
Ko Young-Guk
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Abstract
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Abdominal aortic aneurysm (AAA) is a chronic dilation of the aorta with a tendency to enlarge and eventually rupture, which constitutes a major cause of cardiovascular mortality. Although T-cell infiltrates have been observed in AAA, the cellular, phenotypic, and functional characteristics of these tissue-infiltrating T cells are not fully understood. Here, we investigated the proportional changes of T-cell subsets?including CD4+ T cells, CD8+ T cells, and γδ T cells?and their effector functions in AAAs. We found that Vδ2+ T cells were presented at a higher frequency in aortic aneurysmal tissue compared to normal aortic tissue and PBMCs from patients with AAA. In contrast, no differences were observed in the frequencies of CD4+, CD8+, and Vδ1+ T cells. Moreover, we observed that the Vδ2+ T cells from AAA tissue displayed immunophenotypes indicative of CCR5+ non-exhausted effector memory cells, with a decreased proportion of CD16+ cells. Finally, we found that these Vδ2+ T cells were the main source of IL-17A in abdominal aortic aneurysmal tissue. In conclusion, our results suggest that increased Vδ2+ T cells that robustly produce IL-17A in aortic aneurysmal tissue may contribute to AAA pathogenesis and progression.
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KEYWORD
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Abdominal aortic aneurysm, Gamma Delta T cells, IL-17A
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