1. ORP4L is a prerequisite for the induction of T-cell leukemogenesis associated with human T-cell leukemia virus 1
- Author
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Daoguang Yan, Yu Huang, Wenbin Zhong, Xiuye Cao, Guoping Pan, Meng-Yang Xu, Qun Niu, Qing Yi, Xiaoqin Feng, and Mingchuan Li
- Subjects
Receptors, Steroid ,Carcinogenesis ,T-Lymphocytes ,T cell ,Immunology ,Apoptosis ,Biochemistry ,Virus ,Mice ,hemic and lymphatic diseases ,Tumor Cells, Cultured ,medicine ,Pi ,Animals ,Humans ,Leukemia-Lymphoma, Adult T-Cell ,Protein kinase B ,Cell Proliferation ,Human T-lymphotropic virus 1 ,Hyperactivation ,Gene Expression Regulation, Leukemic ,Chemistry ,Mechanism (biology) ,Gene Products, tax ,Cell Biology ,Hematology ,Prognosis ,medicine.disease ,HTLV-I Infections ,Xenograft Model Antitumor Assays ,Human T cell leukemia virus ,Leukemia ,medicine.anatomical_structure ,Cancer research - Abstract
Human T-cell leukemia virus 1 (HTLV-1) causes adult T-cell leukemia (ATL), but the mechanism underlying its initiation remains elusive. In this study, ORP4L was expressed in ATL cells but not in normal T-cells. ORP4L ablation completely blocked T-cell leukemogenesis induced by the HTLV-1 oncoprotein Tax in mice, whereas engineering ORP4L expression in T-cells resulted in T-cell leukemia in mice, suggesting the oncogenic properties and prerequisite of ORP4L promote the initiation of T-cell leukemogenesis. For molecular insight, we found that loss of miR-31 caused by HTLV-1 induced ORP4L expression in T-cells. ORP4L interacts with PI3Kδ to promote PI(3,4,5)P3 generation, contributing to AKT hyperactivation; NF-κB–dependent, p53 inactivation-induced pro-oncogene expression; and T-cell leukemogenesis. Consistently, ORP4L ablation eliminates human ATL cells in patient-derived xenograft ATL models. These results reveal a plausible mechanism of T-cell deterioration by HTLV-1 that can be therapeutically targeted.
- Published
- 2022