Abnormal expression of TGF-beta type II receptor isoforms contributes to acute myeloid leukemia

• Published in: Oncotarget Vol. 8; no. 6; pp. 10037 - 10049
• Main Authors: Wu, Yong, Su, Min, Zhang, ShuX, Cheng, Yu, Liao, Xiao Y, Lin, Bao Y, Chen, Yuan Z
• Format: Journal Article
• Language: English
• Published: United States Impact Journals LLC 07.02.2017
• Subjects: Animals; Antineoplastic Agents - pharmacology; Apoptosis; Cell Cycle Checkpoints; Cell Differentiation; Cell Proliferation; Female; Gene Expression Regulation, Leukemic; HL-60 Cells; Humans; K562 Cells; Kaplan-Meier Estimate; Leukemia, Myeloid, Acute - drug therapy; Leukemia, Myeloid, Acute - genetics; Leukemia, Myeloid, Acute - metabolism; Leukemia, Myeloid, Acute - pathology; Male; Mice, Inbred BALB C; Mice, Nude; Phosphorylation; Prognosis; Protein Isoforms; Protein-Serine-Threonine Kinases - drug effects; Protein-Serine-Threonine Kinases - genetics; Protein-Serine-Threonine Kinases - metabolism; Receptors, Transforming Growth Factor beta - drug effects; Receptors, Transforming Growth Factor beta - genetics; Receptors, Transforming Growth Factor beta - metabolism; Research Paper; RNA Interference; Signal Transduction; Smad Proteins - metabolism; Time Factors; Transfection; Transforming Growth Factor beta1 - pharmacology; Tretinoin - pharmacology; U937 Cells; leukemia; TGF-β; myeloid; isoform; type II receptor
• ISSN: 1949-2553; 1949-2553
• DOI: 10.18632/oncotarget.14325

Altered transforming growth factor-beta (TGF-β) signaling has been implicated in the pathogenesis of leukemia. Although TGF-β type II receptor (TβRII) isoforms have been isolated from human leukemia cells, their expression patterns and functions of these variants are unclear. In this study, we determined that two TβRII isoforms (TβRII and TβRII-B) are abnormally expressed in leukemic cells, as compared to normal hematopoietic cells. TβRII-B, but not TβRII, was found to promote cell cycle arrest, apoptosis, and differentiation of leukemic cells. TβRII-B also enhanced TGF-β1 binding and downstream signaling and reduced tumorigenicity in vivo. By contrast, TβRII blocked all-trans retinoic acid-induced differentiation through inhibition of TβRII-B. Overall survival was significantly lower in acute myeloid leukemia (AML) patients with high compared to low TβRII expression. Thus, whereas TβRII-B is a potent inducer of cell cycle arrest, apoptosis, and differentiation, higher TβRII expression correlates with poor clinical prognosis in AML.