{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRAET1E, a member of the RAET1/ULBP family of ligands for the activating immune receptor NKG2D, exists in distinct molecular forms. Initial studies demonstrated that RAET1E, unlike its glycosylphosphatidylinositol‐anchored relatives, is expressed as a type I transmembrane protein capable of localizing to the cell surface and binding NKG2D, much like its close family member RAET1G and other ULBPs. In addition, alternative splicing generates a soluble isoform (RAET1E2) that disengages from the membrane, thereby modulating immune recognition by natural killer (NK) and γδ T cells. These findings highlight a dual functionality whereby RAET1E can mediate both stimulatory and, through its soluble variant, inhibitory effects on immune effector cells."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of malignancy and immune surveillance, RAET1E plays a critical role. Its expression on tumor cells has been linked to disease outcome—for example, in ovarian cancer, high RAET1E levels correlate with poorer survival, and in nasopharyngeal carcinoma, lower expression is associated with adverse prognostic indices. Furthermore, a number of studies have identified a spectrum of single nucleotide polymorphisms and promoter variants within the RAET1E gene which not only suggest genetic diversity across populations but also imply potential differences in transcriptional regulation and ligand activity. Such genetic variability may influence both the tumor microenvironment and host susceptibility to cancers as well as other diseases."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "10"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its basic ligand function, RAET1E is emerging as an important modulator of immune cell activity in therapeutic settings. For example, treatment with hydroxychloroquine in chronic myeloid leukemia cells induces translocation of RAET1E to the plasma membrane, thereby enhancing the recognition and cytotoxicity mediated by Vγ9Vδ2 T cells. Furthermore, certain RAET1E polymorphisms have been associated with an increased risk of premature coronary artery disease and altered cardiometabolic profiles, suggesting that RAET1E may have broader implications in inflammation and vascular pathology. Finally, recent work using rigorously validated reagents has questioned previous assertions of ubiquitous ULBP4 (RAET1E) expression by immune cells such as monocytes, indicating that its expression may be far more restricted than initially thought."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Louise Bacon, Robert A Eagle, Martina Meyer, et al. 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