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3253 Endothelial Microparticles Delivering Lncrna NEAT1 Are Involved in the Pathophysiology of aGVHD Following Allogeneic Hematopoietic Stem Cell Transplantation

Program: Oral and Poster Abstracts
Session: 701. Experimental Transplantation: Basic Biology, Pre-Clinical Models: Poster III
Hematology Disease Topics & Pathways:
Biological, Diseases, GVHD, Therapies, Biological Processes, Immune Disorders, epigenetics, Cell Lineage, immune mechanism, transplantation, molecular interactions, pathways
Monday, December 7, 2020, 7:00 AM-3:30 PM

Ran Zhang1*, Weijie Cao1*, Li Li1*, Dingming Wan, MD1*, Zhongxing Jiang, MD1*, Kai Sun, MD2 and Linghui Xia3*

1Department of Hematology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
2Department of Hematology, Zhengzhou Univsersity People's Hospital & Henan Provincial, Zhengzhou, Henan, China
3Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China

Endothelial microparticles (EMPs) upregulation has been observed in the pathological process of acute graft-versus-host disease (aGVHD) after allogeneic hematopoietic stem cell transplantation (allo-HSCT). The biological role and therapeutic potential of long non-coding RNAs (lncRNAs) carried by EMPs in aGVHD after allo-HSCT are still open questions. Herein, we investigated the functional significance of the lncRNA nuclear paraspeckle assembly transcript 1 (NEAT1) delivered by EMPs in aGVHD. To address this question, in the present study, we performed a comprehensive analysis of the lncRNA NEAT1 expression and EMPs in aGVHD by a series of in vivo and in vitro experiments. We found that expressions of lncRNA NEAT1 in MPs were remarkably elevated in aGVHD mice than in non-aGVHD mice. Furthermore, the lncRNA NEAT1 levels in the MPs were remarkably higher than those in the plasma of the aGVHD mice. We then used TNF-α (100 ng/ml) to stimulate primary mouse aortic endothelial cells (MAECs) to shed EMPs, and the expression of lncRNA NEAT1 in the EMPs and their maternal cells was compared. The lncRNA NEAT1 levels in the EMPs produced by TNF-α-stimulated MAECs were significantly higher than that in both their maternal cells and non-stimulated EMPs. Our study demonstrates that EMPs could assemble and concentrate lncRNA NEAT1. Taken together, NEAT1 delivered by EMPs could be used as a diagnostic and prognostic surrogate marker for aGVHD, and its targeting could therefore represent a promising strategy for novel therapeutic options in life-threatening aGVHD after allo-HSCT.

Disclosures: No relevant conflicts of interest to declare.

*signifies non-member of ASH