Production of rAAV by plasmid transfection induces antiviral and inflammatory responses in suspension HEK293
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PROVIDER: PRJNA930839 | ENA |
REPOSITORIES: ENA
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Project description:To understand the response of host cells to rAAV vector production via plasmid transfection, samples were collected throughout the course of three 50 L production batches and analyzed by bulk RNA sequencing of polyadenylated transcripts (RNA-seq). Gene ontology analysis determined that upregulated pathways included inflammatory and antiviral responses. Systematic analyses of the cellular transcriptional response to rAAV production indicates that these host cells are not passively supporting vector manufacture, and therefore may illuminate genes and pathways that influence rAAV production, thereby enabling the rational design of next-generation manufacturing platforms to support safe, effective, and affordable AAV-based gene therapies.
2023-02-06 | GSE224405 | GEO
Project description:Recombinant adeno-associated virus (rAAV) is a clinically proven viral vector for delivery of therapeutic genes to treat rare diseases. Improving rAAV manufacturing productivity and vector quality is necessary to meet clinical and commercial demand. These goals will require an improved understanding of the cellular response to rAAV production, which is poorly defined. We interrogated the kinetic transcriptional response of HEK293 cells to rAAV production following transient plasmid transfection, under manufacturing-relevant conditions, using RNA-seq. Time-series analyses identified a robust cellular response to transfection and rAAV production, with 1,850 transcripts differentially expressed. Gene Ontology analysis determined upregulated pathways, including inflammatory and antiviral responses, with several interferon-stimulated cytokines and chemokines being upregulated at the protein level. Literature-based pathway prediction implicated multiple pathogen pattern sensors and signal transducers in up-regulation of inflammatory and antiviral responses in response to transfection and rAAV replication. Systematic analysis of the cellular transcriptional response to rAAV production indicates that host cells actively sense vector manufacture as an infectious insult. This dataset may therefore illuminate genes and pathways that influence rAAV production, thereby enabling the rational design of next-generation manufacturing platforms to support safe, effective, and affordable AAV-based gene therapies. Graphical abstract HEK cells respond to rAAV gene therapy vector production following triple transfection by inducing inflammatory cytokines and antiviral genes. This suggests that HEK cells may actively inhibit rAAV replication and illuminates potential engineering targets to create next-generation host cells with improved productivity.
| S-EPMC9937832 | biostudies-literature
Project description:Response of HEK293-cells after transfection with EWS-FLI1. HEK293 cells were transfected with the expression vector pIRES2-EGFP containing type I EWS-FLI1 or empty control vector. For transient transfection standard DEAE dextran method was used and RNA was isolated 48h post transfection. For stable transfection cells were transfected using FuGENE 6 (Roche, Mannheim, Germany) and cells were selected with 400 ug/mL G418. DNA-microarray analysis was performed using Affymetrix HG-U133A microarrays.(see Staege et al. Cancer Res. 2004) Keywords = HEK293 Keywords = EWS-FLI1 Keywords = Ewing family tumors Keywords: other
2004-10-07 | GSE1822 | GEO
Project description:Transfection experiment with the plasmid containing pri-mir-124 in HEK293 cells
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Project description:Human embryonal kidney cells (HEK-293) are the most common host cells used for transient recombinant adeno-associated virus (rAAV) production in pharmaceutical industry. To better cover the expected gene therapy product demands in the future, different traditional strategies such as cell line sub-cloning and/or addition of chemical substances to the fermentation media have been used to maximize titers and improve product quality. A more effective and advanced approach to boost yield can be envisaged by characterizing the transcriptome of different HEK-293 cell line pedigrees with distinct rAAV productivity patterns to subsequently identify potential gene targets for cell engineering. In this work, the mRNA expression profile of three HEK-293 cell lines, resulting in various yields during a fermentation batch process for rAAV production, was investigated to gain basic insight into cell variability and eventually to identify genes that correlate with productivity. Mock runs using only transfection reagents were performed in parallel as a control. We found significant differences in gene regulatory behaviors between the three cell lines at different growth and production stages. The evaluation of these transcriptomics profiles combined with collected in-process control parameters and titers shed some light on potential cell engineering targets to maximize transient production of rAAV in HEK-293 cells Comparison of three HEK-293 suspension cell lines transcriptomics during an AAV production process
2024-05-13 | GSE226054 | GEO
Project description:Analysis of the transcriptional response of HEK293 or HEK293-STAT6 stable cell lines to poly(I:C) transfection. The hypothesis tested was that poly(I:C) transfection is capable of inducing the expression of STAT6-dependent antiviral genes. mRNA isolated from HEK293 or HEK293-STAT6 stable cell lines with control treatment or poly(I:C) transfection for 16 hours.
2011-11-21 | E-GEOD-26435 | biostudies-arrayexpress
Project description:Analysis of the transcriptional response of HEK293 or HEK293-STAT6 stable cell lines to poly(I:C) transfection. The hypothesis tested was that poly(I:C) transfection is capable of inducing the expression of STAT6-dependent antiviral genes.
2011-11-21 | GSE26435 | GEO
Project description:BackgroundDicer is a 219-kDa protein that plays key roles in gene regulation, particularly as the ribonuclease III enzyme responsible for cleaving precursor miRNA substrates. Its enzymatic activity is highly regulated by protein factors, and this regulation can impact on the levels of miRNAs and modulate the behavior of a cell. To better understand the underlying mechanisms of regulation, detailed enzymatic and structural characterization of Dicer are needed. However, these types of studies generally require several milligrams of recombinant protein, and efficient preparation of such quantities of pure human Dicer remains a challenge. To prepare large quantities of human Dicer, we have optimized transfection in HEK293-6E cells grown in suspension and streamlined a purification procedure.ResultsTransfection conditions were first optimized to achieve expression levels between 10 and 18?mg of recombinant Dicer per liter of culture. A three-step purification protocol was then developed that yields 4-9?mg of purified Dicer per liter of culture in a single day. From SEC-MALS/RI analysis and negative stain TEM, we confirmed that the purified protein is monomerically pure ( ? 98%) and folds with the characteristic L-shape geometry. Using an electrophoretic mobility shift assay, a dissociation constant (Kd) of 5?nM was measured for Dicer binding to pre-let-7a-1, in agreement with previous reports. However, when probing the cleavage activity of Dicer for pre-let-7a-1, we measured kcat (7.2?±?0.5?min-?1) and KM (1.2?±?0.3??M) values that are much higher than previously reported due to experimental conditions that better respect the steady-state assumption.ConclusionsThe expression and purification protocols described here provide high yields of monomerically pure and active human Dicer. Cleavage studies of a pre-let-7 substrate with this purified Dicer reveal higher kcat and KM values than previously reported and support the current view that conformational changes are associated with substrate binding. Large quantities of highly pure Dicer will be valuable for future biochemical, biophysical and structural investigations of this key protein of the miRNA pathway.
| S-EPMC6282390 | biostudies-literature
Project description:Transcriptional impact of EGFR-AT1R-crosstalk (Transient transfection of AT1R in HEK293 cells)
| PRJNA682998 | ENA
Project description:Transcriptional impact of EGFR-AT1R-crosstalk (Stable transfection of AT1R in HEK293 cells)
| PRJNA682997 | ENA