Leukemia translocation protein PLZF inhibits cell growth and expression of cyclin A

• Published in: Oncogene Vol. 18; no. 4; pp. 925 - 934
• Main Authors: YEYATI, P. L, SHAKNOVICH, R, BOTERASHVILI, S, JIA LI, BALL, H. J, WAXMAN, S, NASON-BURCHENAL, K, DMITROVSKY, E, ZELENT, A, LICHT, J. D
• Format: Journal Article
• Language: English
• Published: Basingstoke Nature Publishing 28.01.1999
• Subjects: 3T3 Cells; Animals; Biological and medical sciences; Cell Cycle - genetics; Cell physiology; Cell transformation and carcinogenesis. Action of oncogenes and antioncogenes; Chromosomes, Human, Pair 11; Chromosomes, Human, Pair 17; Cyclin A - metabolism; Cyclin-Dependent Kinases - metabolism; DNA-Binding Proteins - genetics; DNA-Binding Proteins - physiology; Fundamental and applied biological sciences. Psychology; Genetic Vectors; Humans; Interphase - genetics; Kruppel-Like Transcription Factors; Leukemia, Promyelocytic, Acute - genetics; Leukemia, Promyelocytic, Acute - metabolism; Leukemia, Promyelocytic, Acute - pathology; Mice; Molecular and cellular biology; Neoplasm Proteins - metabolism; Oncogene Proteins, Fusion - physiology; Promyelocytic Leukemia Zinc Finger Protein; S Phase - genetics; Transcription Factors - genetics; Transcription Factors - physiology; Translocation, Genetic; Zinc Fingers - physiology; Chromosomal aberration; Human; Promyelocytic leukemia; Cell proliferation; Acute; Malignant hemopathy; Gene expression; Carcinogenesis; Cell line; Cyclin A; Cell cycle; Abnormal chromosome; Fusion protein; Hybrid gene; Chromosome translocation
• DOI: 10.1038/sj.onc.1202375
• ISSN: 0950-9232

The PLZF gene was identified by its fusion with the RARalpha locus in a therapy resistant form of acute promyelocytic leukemia (APL) associated with the t(11;17)(q23;q21) translocation. Here we describe PLZF as a negative regulator of cell cycle progression ultimately leading to growth suppression. PLZF can bind and repress the cyclin A2 promoter while expression of cyclin A2 reverts the growth suppressed phenotype of myeloid cells expressing PLZF. In contrast RARalpha-PLZF, a fusion protein generated in t(11;17)(q23;q21)-APL activates cyclin A2 transcription and allows expression of cyclin A in anchorage-deprived NIH3T3 cells. Therefore, cyclin A2 is a candidate target gene for PLZF and inhibition of cyclin A expression may contribute to the growth suppressive properties of PLZF. Deregulation of cyclin A2 by RARalpha-PLZF may represent an oncogenic mechanism of this chimeric protein and contribute to the aggressive clinical phenotype of t(11;17)(q23;q21)-associated APL.