2050 Identifying the role and immunobiological mechanisms of Fli-1 mediated pathogenicity in graft Versus host disease

• Published in: Journal of clinical and translational science Vol. 2; no. S1; pp. 14 - 15
• Main Authors: Schutt, Steven, Wu, Yongxia, Daenthanasanmak, Anusara, Bastian, David, Wilson, Carole, Schnapp, Lynn, Zhang, Xian, Yu, Xue-Zhong, Nguyen, Hung, Sofi, Mohammed Hanief, Iamsuwat, Supinya
• Format: Journal Article
• Language: English
• Published: Cambridge Cambridge University Press 01.06.2018
• Subjects: Basic/Translational Science/Team Science; Cell activation; Erythroleukemia; FLI-1 gene; FLI-1 protein; Flow cytometry; Graft-versus-host reaction; Hematopoietic stem cells; Interferon; Lymphocytes; Lymphocytes B; Lymphocytes T; Melanoma; Pathogenicity; PD-1 protein; Plasma cells; Population studies; Rodents; Stem cell transplantation; Systemic lupus erythematosus
• ISSN: 2059-8661; 2059-8661
• DOI: 10.1017/cts.2018.83

OBJECTIVES/SPECIFIC AIMS: Allogeneic hematopoietic stem cell transplantation (allo-HCT) is a curative procedure for hematological malignancies. Chronic graft Versus host disease (cGVHD) is a lethal complication that often develops after allo-HCT. Fli-1 is an aberrantly expressed protein in cancers including erythroleukemia and melanoma, while being implicated in pathogenesis of systemic lupus in mice and humans, a disease with marked similarity to cGVHD. METHODS/STUDY POPULATION: cGVHD was induced using hematopoietic cells from conditional knock-out mice deficient for the fli-1 gene specifically on T cells and progression of cGVHD in murine allo-HCT recipients was monitored using a clinical scoring system, and changes in activation status of hematopoietic cell populations were quantified using flow cytometry. RESULTS/ANTICIPATED RESULTS: Recipients transplanted with fli-1 deficient T cells exhibited reduced cGVHD clinical scores compared with littermate wild-type controls. Donor-grafts containing fli-1 deficient T cells were associated with restrained T-cell responses including reduced Interferon-y cytokine production, PD-1 expression, and differentiation into follicular helper T cells. fli-1 T-cell deficient donor-grafts also improved donor B-cell reconstitution and reduced plasma cells in allo-HCT recipients relative to littermate wild-type control donor-graft recipients. DISCUSSION/SIGNIFICANCE OF IMPACT: Thus, inhibiting Fli-1 represents a promising therapeutic strategy for the goal of preventing cGVHD after allo-HCT while also directly targeting cancers which aberrantly express Fli-1.