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Updated: Sep 19, 2025

Isolating Human Peripheral Blood Mononuclear Cells and CD4+ T cells from Sézary Syndrome Patients for Transcriptomic Profiling
Published on: October 14, 2021
Exosomes containing long non-coding RNA AGAP2-AS1 promote the differentiation of CD4+ T cells through the
Ziqi Yuan1, Xue Zeng1, Xiwei Zhang1
1Department of Dermatology, Nanfang Hospital, Southern Medical University, Guangzhou, China.
Background:
Long non-coding RNAs (lncRNAs) have been implicated in the pathogenesis of autoimmune diseases. Our previous research demonstrated that AGAP2-AS1 in keratinocytes is involved in the pathogenesis of psoriasis, but its effect on CD4+ T cell differentiation remains unclear.
Methods:
Exosomes were extracted from HaCaT cells using a reagent kit and verified by TEM (Transmission Electron Microscope), NTA (Nanoparticle Tracking Analysis), and Western Blot. We incubated exosomes with CD4+ T cells and detected the distribution of AGAP2-AS1 by fluorescence microscopy. Flow cytometry and ELISA were used to detect CD4+ T cell differentiation. In addition, the relationship between AGAP2-AS1/miR-424-5p/SGK1 and its effect on CD4+ T cell differentiation were confirmed by bioinformatics analysis, dual luciferase reporter gene experiments, quantitative real-time PCR, flow cytometry, and ELISA.
Results:
We found that exosomes derived from TNF-α-treated HaCaTs were able to deliver AGAP2-AS1 to CD4+ T cells, promoting Th1 and Th17 differentiation. In CD4+ T cells, AGAP2-AS1 promotes Th1 and Th17 differentiation via the miR-424-5p/SGK1 axis.
Conclusion:
Psoriatic HaCaTs deliver AGAP2-AS1 to CD4+ T cells via exosomes, inducing Th1 and Th17 differentiation through the miR-424-5p/SGK1 axis, thereby promoting the progression of psoriasis. These findings provide novel insights into the pathogenesis of psoriasis and potential therapeutic targets.
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