title: Inverse correlation between the metastasis suppressor RKIP and the metastasis inducer YY1: Contrasting roles in the regulation of chemo/immuno-resistance in cancer.
abstract: Several gene products have been postulated to mediate inherent and/or acquired anticancer drug resistance and tumor metastasis. Among these, the metastasis suppressor and chemo-immuno-sensitizing gene product, Raf Kinase Inhibitor Protein (RKIP), is poorly expressed in many cancers. In contrast, the metastasis inducer and chemo-immuno-resistant factor Yin Yang 1 (YY1) is overexpressed in many cancers. This inverse relationship between RKIP and YY1 expression suggests that these two gene products may be regulated via cross-talks of molecular signaling pathways, culminating in the expression of different phenotypes based on their targets. Analyses of the molecular regulation of the expression patterns of RKIP and YY1 as well as epigenetic, post-transcriptional, and post-translational regulation revealed the existence of several effector mechanisms and crosstalk pathways, of which five pathways of relevance have been identified and analyzed. The five examined cross-talk pathways include the following loops: RKIP/NF-κB/Snail/YY1, p38/MAPK/RKIP/GSK3β/Snail/YY1, RKIP/Smurf2/YY1/Snail, RKIP/MAPK/Myc/Let-7/HMGA2/Snail/YY1, as well as RKIP/GPCR/STAT3/miR-34/YY1. Each loop is comprised of multiple interactions and cascades that provide evidence for YY1's negative regulation of RKIP expression and vice versa. These loops elucidate potential prognostic motifs and targets for therapeutic intervention. Chiefly, these findings suggest that targeted inhibition of YY1 by specific small molecule inhibitors and/or the specific induction of RKIP expression and activity are potential therapeutic strategies to block tumor growth and metastasis in many cancers, as well as to overcome anticancer drug resistance. These strategies present potential alternatives for their synergistic uses in combination with low doses of conventional chemo-immunotherapeutics and hence, increasing survival, reducing toxicity, and improving quality of life.
authors.affiliation: Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine, UCLA, Los Angeles, CA, 90095, United States.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Wottrich
authors.affiliation: Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine, UCLA, Los Angeles, CA, 90095, United States.
authors.forename: Samantha
authors.initials: S
authors.lastname: Kaufhold
authors.affiliation: Division of Surgical Oncology, University Hospital of Heraklion, School of Medicine, University of Crete, Heraklion, 71110, Crete, Greece.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Chrysos
authors.affiliation: Division of Surgical Oncology, University Hospital of Heraklion, School of Medicine, University of Crete, Heraklion, 71110, Crete, Greece.
authors.forename: Odysseas
authors.initials: O
authors.lastname: Zoras
authors.affiliation: Division of Surgical Oncology, University Hospital of Heraklion, School of Medicine, University of Crete, Heraklion, 71110, Crete, Greece.
authors.forename: Stavroula
authors.initials: S
authors.lastname: Baritaki
authors.affiliation: Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine, UCLA, Los Angeles, CA, 90095, United States. Electronic address: bbonavida@mednet.ucla.edu.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Bonavida
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis; D019008:Drug Resistance, Neoplasm / Q000502:physiology*; D006801:Humans; D009369:Neoplasms / Q000188:drug therapy*; D049488:Phosphatidylethanolamine Binding Protein / Q000096:biosynthesis*; D015398:Signal Transduction / Q000502:physiology; D014157:Transcription Factors / Q000378:metabolism; D050986:YY1 Transcription Factor / Q000096:biosynthesis*
chemical_list: D000970:Antineoplastic Agents; D049488:Phosphatidylethanolamine Binding Protein; D014157:Transcription Factors; D050986:YY1 Transcription Factor
keywords: Cancer; Drug resistance; Immune-resistance; Raf-1 kinase inhibitory protein (RKIP); Yin Yang 1 (YY1)