RNF5 Regulation of RBBP4 Defines Acute Myeloid Leukemia Growth and Susceptibility to Histone Deacetylase Inhibitors

Khateb, A.; Deshpande, A.; Feng, Y.; Lee, J. S.; Lazar, I.; Fabre, B.; Li, Y.; Finlay, D.; Fujita, Y.; Zhang, T.; Yin, J.; Pass, I.; Livneh, I.; Burian, C.; Mason, J. R.; Almog, R.; Horesh, N.; Ofran, Y.; Brown, K.; Vuori, K.; Jackson, M.; Ruppin, E.; Deshpande, A. J.; Ronai, Z. A.

doi:10.1101/2020.10.25.349241

Home/Archive/bioRxiv

bioRxiv · 10.1101/2020.10.25.349241

RNF5 Regulation of RBBP4 Defines Acute Myeloid Leukemia Growth and Susceptibility to Histone Deacetylase Inhibitors

View original source ↗Export metadata ↓

Abstract

Acute myeloid leukemia (AML) remains incurable, largely due to its resistance to conventional treatments. Here, we found that increased expression and abundance of the ubiquitin ligase RNF5 contributes to AML development and survival. High RNF5 expression in AML patients correlated with poor prognosis. RNF5 inhibition decreased AML cell growth in culture and in vivo, and blocked development of MLL-AF9-driven leukemogenesis in mice, prolonging their survival. RNF5 inhibition led to transcriptional changes that overlapped with those seen upon HDAC1 inhibition. RNF5 induced the formation of K29 ubiquitin chains on the histone-binding protein RBBP4, promoting its recruitment and subsequent epigenetic regulation of genes involved in AML development and maintenance. Correspondingly, RNF5 or RBBP4 knockdown enhanced the sensitivity of AML cells to histone deacetylase (HDAC) inhibitors. Notably, low expression of RNF5 and HDAC coincided with a favorable prognosis. Our studies identified ERAD-independent role for RNF5, demonstrating that its control of RBBP4 constitutes an epigenetic pathway that drives AML while highlighting RNF5/RBBP4 as markers to stratify patients for treatment with HDAC inhibitors.

Source connections

Published article ↗

Explore related subjects

cancer biology Preprint

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

Khateb, A., Deshpande, A., Feng, Y., Lee, J. S., Lazar, I., Fabre, B., Li, Y., Finlay, D., Fujita, Y., Zhang, T., Yin, J., Pass, I., Livneh, I., Burian, C., Mason, J. R., Almog, R., Horesh, N., Ofran, Y., Brown, K., Vuori, K., Jackson, M., Ruppin, E., Deshpande, A. J., Ronai, Z. A.. 2020-10-25. RNF5 Regulation of RBBP4 Defines Acute Myeloid Leukemia Growth and Susceptibility to Histone Deacetylase Inhibitors. https://doi.org/10.1101/2020.10.25.349241

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related preprints

bioRxiv2026

Psychoneuroimmunology of Viral Hepatitis and Hepatocellular Carcinoma: A Systematic Review and Meta-Analysis

Hepatocellular carcinoma (HCC) and viral hepatitis (VH) are recognized primarily as hepatic diseases, yet they impose a substantial neuropsychiatric disorders (NPDs) encompassing depression, anxiety, cognitive impairment, and fatigue. Whether these manifestations reflect psychological reactions or biologically grounded psychoneuroimmune dysfunction remains poorly understood. Here, we present a pre-registered systematic review and meta-analysis (PROSPERO 2026 CRD420251081757) synthesizing evidence from 24 studies combining psychosocial outcomes with immune dysregulation markers across HCC and VH populations. Bibliometric and network analyses identified a growing psychoneuroimmunology research hub linking cytokine signaling, microglial activation, blood-brain barrier (BBB) disruption, and gut-liver-brain axis dysregulation to the neuropsychiatric phenotype of these diseases. Meta-analysis revealed a pooled hazard ratio (HR) of 1.92 (95% CI: 1.09-3.39) for adverse outcomes in HCC and a pooled HR of 2.28 (95% CI: 1.48-3.52) for depression associated to genetic variants in VH. TNF-a, but not IL-6, showed a tendency toward lower levels in VH patients with versus without NPDs, suggesting differential inflammatory roles. The literature, however, remains fragmented by heterogeneous designs and a paucity of longitudinal data. A psychoneuroimmunological approach, integrating immune, endocrine, neural, and psychosocial dimensions, is essential for capturing the full systemic impact of HCC and VH and should inform future mechanistic research and multidisciplinary clinical strategies.

cancer biology↗

bioRxiv2026

Nutrient Availability as a Driver of Transcriptome Reprogramming in Osteosarcoma

Background: Gene expression in mammalian cells is intricately regulated by environmental and metabolic cues. Among these, nutrient availability represents a key feature of the tumor microenvironment and has recently emerged as a potent modulator of oncogenic signaling networks. In this study, we employed a cell-line model of osteosarcoma, a rare but highly aggressive bone malignancy affecting both humans and dogs. We demonstrate that altering the concentration of a single nutrient can profoundly reprogram gene expression in osteosarcoma cells, revealing a previously underexplored phenomenon: nutrient-dependent gene regulation. This finding highlights potential opportunities for therapeutic intervention and underscores the broader implications of metabolic regulation for personalized medicine and nutrition. Methods/Results: We performed bulk RNA sequencing of an established osteosarcoma cell line cultured under varying concentrations of two key nutrients, glucose and glutamine. Differential gene expression analysis revealed a pronounced nutrient-dependent transcriptional response. The identified genes were functionally associated with pathways involved in cancer, development, nervous system regulation, metabolism, cellular signaling, and immune responses. We identified seven distinct expression patterns, one of which exhibited a striking correlation with cell growth rate and resembled a FOS-like transcriptional signature. Notably, the proto-oncogene FOS was among the identified genes and displayed a strong growth-rate-dependent expression pattern. Conclusion/Impact: Our findings demonstrate that modulation of nutrient availability profoundly reshapes the gene expression landscape of osteosarcoma cells, revealing nutrient-responsive targets with potential therapeutic relevance. This work expands our understanding of metabolic regulation in cancer and suggests that nutrient-based interventions may provide a controllable means of influencing tumor progression. Beyond oncology, such approaches may also have broader implications for developmental biology, autoimmune disorders, and nervous system function. More broadly, this study highlights the potential of metabolic interventions as a strategy for targeted modulation of gene expression programs.

cancer biology↗

bioRxiv2026

Synthetic chromatin engineering for STAT1 reactivation toward restoring cisplatin sensitivity in breast cancer

Chemoresistant cancers acquire transcriptomic and epigenetic alterations through changes in transcription factor activity and chromatin accessibility. Integrative in silico analyses identified STAT1 as a recurrently suppressed transcription factor in cisplatin-resistant breast cancer. Using cisplatin-resistant triple-negative breast cancer (TNBC) MDA-MB-231 cells, we further confirmed reduced STAT1 expression and activity, accompanied by defective nuclear translocation, indicating that suppression of STAT1 signaling contributes to cisplatin resistance in breast cancer. To restore STAT1 activity, we sought to promote its nuclear localization and transcriptional activation through chromatin engineering. Based on the identification of PHF6 as a direct STAT1-binding protein through in silico and in vitro analyses, we engineered Dual Reader 3 (DR3), a PHF6-derived synthetic chromatin regulator designed to enhance both STAT1 interaction and chromatin engagement through histone H2B ubiquitination. DR3 induced STAT1-associated transcriptional programs, including inflammatory and tumor-suppressive miRNAs. Mechanistically, DR3 physically promoted STAT1 nuclear translocation, activated STAT1 through a non-canonical S727-dependent mechanism independent of Tyr701 phosphorylation, and enhanced chromatin accessibility at STAT1-responsive regulatory regions through histone H2B ubiquitination. CUT&RUN analysis further revealed coordinated transcriptional and epigenetic remodeling associated with DR3-mediated STAT1 activation, including upregulation of HIPK2, which enhanced cellular sensitivity to cisplatin by strengthening the intrinsic DNA damage response. Finally, we investigated whether STAT1 reactivation could alleviate acquired cisplatin resistance. In vivo delivery of DR3 restored cisplatin sensitivity in resistant breast tumors. By coupling STAT1 nuclear translocation with chromatin remodeling, DR3 reactivated STAT1-dependent transcriptional programs and restored cisplatin sensitivity in breast cancer. Together, this study establishes transcription factor reactivation through synthetic chromatin engineering as a potential therapeutic strategy for overcoming chemoresistance in solid tumors.

cancer biology↗