1
|
Suthapot P, Xiao T, Felsenfeld G, Hongeng S, Wongtrakoongate P. The RNA helicases DDX5 and DDX17 facilitate neural differentiation of human pluripotent stem cells NTERA2. Life Sci 2022; 291:120298. [PMID: 35007564 DOI: 10.1016/j.lfs.2021.120298] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 12/21/2021] [Accepted: 12/31/2021] [Indexed: 12/31/2022]
Abstract
AIMS Understanding human neurogenesis is critical toward regenerative medicine for neurodegeneration. However, little is known how neural differentiation is regulated by DEAD box-containing RNA helicases, which comprise a diverse class of RNA remodeling enzymes. MATERIALS AND METHODS ChIP-seq was utilized to identify binding sites of DDX5 and DDX17 in both human pluripotent stem cell (hPSC) line NTERA2 and their retinoic acid-induced neural derivatives. RNA-seq was used to elucidate genes differentially expressed upon depletion of DDX5 and DDX17. Neurosphere assay, flow cytometry, and immunofluorescence staining were performed to test the effect of depletion of the two RNA helicases in neural differentiation. KEY FINDINGS We show here that expression of DDX5 and DDX17 is abundant throughout neural differentiation of NTERA2, and is mostly localized within the nucleus. The two RNA helicases occupy chromatin genome-wide at regions associated with neurogenesis-related genes in both hPSCs and their neural derivatives. Further, both DDX5 and DDX17 are mutually required for controlling transcriptional expression of these genes, but are not important for maintenance of stem cell state of hPSCs. In contrast, they facilitate early neural differentiation of hPSCs, generation of neurospheres from the stem cells, and transcriptional expression of key neurogenic transcription factors such as SOX1 and PAX6 during neural differentiation. Importantly, DDX5 and DDX17 are critical for differentiation of hPSCs toward NESTIN- and TUBB3-positive cells, which represent neural progenitors and mature neurons, respectively. SIGNIFICANCE Collectively, our findings suggest the role of DDX5 and DDX17 in transcriptional regulation of genes involved in neurogenesis, and hence in neural differentiation of hPSCs.
Collapse
Affiliation(s)
- Praewa Suthapot
- Department of Biochemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Tiaojiang Xiao
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda 20892-0540, MD, USA
| | - Gary Felsenfeld
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda 20892-0540, MD, USA
| | - Suradej Hongeng
- Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand
| | - Patompon Wongtrakoongate
- Department of Biochemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Center for Neuroscience, Faculty of Science, Mahidol University, Bangkok 10400, Thailand.
| |
Collapse
|
2
|
Bazley FA, Liu CF, Yuan X, Hao H, All AH, De Los Angeles A, Zambidis ET, Gearhart JD, Kerr CL. Direct Reprogramming of Human Primordial Germ Cells into Induced Pluripotent Stem Cells: Efficient Generation of Genetically Engineered Germ Cells. Stem Cells Dev 2015; 24:2634-48. [PMID: 26154167 DOI: 10.1089/scd.2015.0100] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Primordial germ cells (PGCs) share many properties with embryonic stem cells (ESCs) and innately express several key pluripotency-controlling factors, including OCT4, NANOG, and LIN28. Therefore, PGCs may provide a simple and efficient model for studying somatic cell reprogramming to induced pluripotent stem cells (iPSCs), especially in determining the regulatory mechanisms that fundamentally define pluripotency. Here, we report a novel model of PGC reprogramming to generate iPSCs via transfection with SOX2 and OCT4 using integrative lentiviral. We also show the feasibility of using nonintegrative approaches for generating iPSC from PGCs using only these two factors. We show that human PGCs express endogenous levels of KLF4 and C-MYC protein at levels similar to embryonic germ cells (EGCs) but lower levels of SOX2 and OCT4. Transfection with both SOX2 and OCT4 together was required to induce PGCs to a pluripotent state at an efficiency of 1.71%, and the further addition of C-MYC increased the efficiency to 2.33%. Immunohistochemical analyses of the SO-derived PGC-iPSCs revealed that these cells were more similar to ESCs than EGCs regarding both colony morphology and molecular characterization. Although leukemia inhibitory factor (LIF) was not required for the generation of PGC-iPSCs like EGCs, the presence of LIF combined with ectopic exposure to C-MYC yielded higher efficiencies. Additionally, the SO-derived PGC-iPSCs exhibited differentiation into representative cell types from all three germ layers in vitro and successfully formed teratomas in vivo. Several lines were generated that were karyotypically stable for up to 24 subcultures. Their derivation efficiency and survival in culture significantly supersedes that of EGCs, demonstrating their utility as a powerful model for studying factors regulating pluripotency in future studies.
Collapse
Affiliation(s)
- Faith A Bazley
- 1 Department of Biomedical Engineering, The Johns Hopkins University School of Medicine , Baltimore, Maryland
| | - Cyndi F Liu
- 2 Department of Genecology and Obstetrics, The Johns Hopkins University School of Medicine , Baltimore, Maryland.,3 Institute for Cell Engineering, The Johns Hopkins University School of Medicine , Baltimore, Maryland
| | - Xuan Yuan
- 4 Department of Medicine, Division of Hematology, The Johns Hopkins University School of Medicine , Baltimore, Maryland
| | - Haiping Hao
- 5 JHMI Deep Sequencing and Microarray Core, High Throughput Biology Center, Johns Hopkins University , Baltimore, Maryland
| | - Angelo H All
- 1 Department of Biomedical Engineering, The Johns Hopkins University School of Medicine , Baltimore, Maryland
| | - Alejandro De Los Angeles
- 6 Stem Cell Transplantation Program, Division of Pediatric Hematology Oncology, Children's Hospital Boston , Massachusetts.,7 Department of Biological Chemistry and Molecular Pharmacology, Dana-Farber Cancer Institute , Harvard Medical School, Boston, Massachusetts.,8 Harvard Stem Cell Institute , Cambridge, Massachusetts
| | - Elias T Zambidis
- 3 Institute for Cell Engineering, The Johns Hopkins University School of Medicine , Baltimore, Maryland.,9 Division of Pediatric Oncology at the Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine , Baltimore, Maryland
| | - John D Gearhart
- 10 Department of Cell and Developmental Biology, School of Medicine, University of Pennsylvania , Philadelphia, Pennsylvania.,11 Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania , Philadelphia, Pennsylvania
| | - Candace L Kerr
- 2 Department of Genecology and Obstetrics, The Johns Hopkins University School of Medicine , Baltimore, Maryland.,12 Department of Biochemistry and Molecular Biology, University of Maryland , Baltimore, Maryland
| |
Collapse
|
3
|
Wongtrakoongate P. Epigenetic therapy of cancer stem and progenitor cells by targeting DNA methylation machineries. World J Stem Cells 2015; 7:137-148. [PMID: 25621113 PMCID: PMC4300924 DOI: 10.4252/wjsc.v7.i1.137] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 10/01/2014] [Accepted: 10/29/2014] [Indexed: 02/06/2023] Open
Abstract
Recent advances in stem cell biology have shed light on how normal stem and progenitor cells can evolve to acquire malignant characteristics during tumorigenesis. The cancer counterparts of normal stem and progenitor cells might be occurred through alterations of stem cell fates including an increase in self-renewal capability and a decrease in differentiation and/or apoptosis. This oncogenic evolution of cancer stem and progenitor cells, which often associates with aggressive phenotypes of the tumorigenic cells, is controlled in part by dysregulated epigenetic mechanisms including aberrant DNA methylation leading to abnormal epigenetic memory. Epigenetic therapy by targeting DNA methyltransferases (DNMT) 1, DNMT3A and DNMT3B via 5-Azacytidine (Aza) and 5-Aza-2’-deoxycytidine (Aza-dC) has proved to be successful toward treatment of hematologic neoplasms especially for patients with myelodysplastic syndrome. In this review, I summarize the current knowledge of mechanisms underlying the inhibition of DNA methylation by Aza and Aza-dC, and of their apoptotic- and differentiation-inducing effects on cancer stem and progenitor cells in leukemia, medulloblastoma, glioblastoma, neuroblastoma, prostate cancer, pancreatic cancer and testicular germ cell tumors. Since cancer stem and progenitor cells are implicated in cancer aggressiveness such as tumor formation, progression, metastasis and recurrence, I propose that effective therapeutic strategies might be achieved through eradication of cancer stem and progenitor cells by targeting the DNA methylation machineries to interfere their “malignant memory”.
Collapse
|