An in Vitro Screening System for Protein Splicing Inhibitors Based on Green Fluorescent Protein as an Indicator

2003 ◽  
Vol 75 (10) ◽  
pp. 2456-2462 ◽  
Author(s):  
Jaya Pal Gangopadhyay ◽  
Shu-qin Jiang ◽  
Henry Paulus
Keyword(s):  
Green Fluorescent Protein ◽  
Fluorescent Protein ◽  
Protein Splicing ◽  
In Vitro Screening ◽  
Screening System ◽  
Green Fluorescent

scholarly journals Development and Characterization of a cDNA-Launch Recombinant Simian Hemorrhagic Fever Virus Expressing Enhanced Green Fluorescent Protein: ORF 2b’ Is Not Required for In Vitro Virus Replication

Viruses ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 632
Author(s):  
Yingyun Cai ◽  
Shuiqing Yu ◽  
Ying Fang ◽  
Laura Bollinger ◽  
Yanhua Li ◽  
...  
Keyword(s):  
Green Fluorescent Protein ◽  
Cell Lines ◽  
Enhanced Green Fluorescent Protein ◽  
Fluorescent Protein ◽  
Infectious Clone ◽  
Hemorrhagic Fever ◽  
Simian Hemorrhagic Fever Virus ◽  
Hemorrhagic Fever Virus ◽  
Green Fluorescent

Simian hemorrhagic fever virus (SHFV) causes acute, lethal disease in macaques. We developed a single-plasmid cDNA-launch infectious clone of SHFV (rSHFV) and modified the clone to rescue an enhanced green fluorescent protein-expressing rSHFV-eGFP that can be used for rapid and quantitative detection of infection. SHFV has a narrow cell tropism in vitro, with only the grivet MA-104 cell line and a few other grivet cell lines being susceptible to virion entry and permissive to infection. Using rSHFV-eGFP, we demonstrate that one cricetid rodent cell line and three ape cell lines also fully support SHFV replication, whereas 55 human cell lines, 11 bat cell lines, and three rodent cells do not. Interestingly, some human and other mammalian cell lines apparently resistant to SHFV infection are permissive after transfection with the rSHFV-eGFP cDNA-launch plasmid. To further demonstrate the investigative potential of the infectious clone system, we introduced stop codons into eight viral open reading frames (ORFs). This approach suggested that at least one ORF, ORF 2b’, is dispensable for SHFV in vitro replication. Our proof-of-principle experiments indicated that rSHFV-eGFP is a useful tool for illuminating the understudied molecular biology of SHFV.

scholarly journals Human Keratinocytes Adopt Neuronal Fates After In Utero Transplantation in the Developing Rat Brain

2021 ◽  
Vol 30 ◽  
pp. 096368972097821
Author(s):  
Andrea Tenorio-Mina ◽  
Daniel Cortés ◽  
Joel Esquivel-Estudillo ◽  
Adolfo López-Ornelas ◽  
Alejandro Cabrera-Wrooman ◽  
...  
Keyword(s):  
Green Fluorescent Protein ◽  
Fluorescent Protein ◽  
Ectopic Expression ◽  
Neural Induction ◽  
Human Keratinocytes ◽  
Differentiation Potential ◽  
Neuronal Proteins ◽  
Green Fluorescent

Human skin contains keratinocytes in the epidermis. Such cells share their ectodermal origin with the central nervous system (CNS). Recent studies have demonstrated that terminally differentiated somatic cells can adopt a pluripotent state, or can directly convert its phenotype to neurons, after ectopic expression of transcription factors. In this article we tested the hypothesis that human keratinocytes can adopt neural fates after culturing them in suspension with a neural medium. Initially, keratinocytes expressed Keratins and Vimentin. After neural induction, transcriptional upregulation of NESTIN, SOX2, VIMENTIN, SOX1, and MUSASHI1 was observed, concomitant with significant increases in NESTIN detected by immunostaining. However, in vitro differentiation did not yield the expression of neuronal or astrocytic markers. We tested the differentiation potential of control and neural-induced keratinocytes by grafting them in the developing CNS of rats, through ultrasound-guided injection. For this purpose, keratinocytes were transduced with lentivirus that contained the coding sequence of green fluorescent protein. Cell sorting was employed to select cells with high fluorescence. Unexpectedly, 4 days after grafting these cells in the ventricles, both control and neural-induced cells expressed green fluorescent protein together with the neuronal proteins βIII-Tubulin and Microtubule-Associated Protein 2. These results support the notion that in vivo environment provides appropriate signals to evaluate the neuronal differentiation potential of keratinocytes or other non-neural cell populations.

In vitro and in vivo evaluation of a green fluorescent protein-HSV1-TK dual-function pet reporter gene

2001 ◽  
Vol 44 (S1) ◽  
pp. S339-S341
Author(s):  
K. E. Luker ◽  
G. D. Luker ◽  
C. M. Pica ◽  
J. L. Dahlheimer ◽  
T. J. Fahrner ◽  
...  
Keyword(s):  
Green Fluorescent Protein ◽  
Reporter Gene ◽  
Fluorescent Protein ◽  
Dual Function ◽  
In Vivo Evaluation ◽  
Green Fluorescent

scholarly journals Enhanced Green Fluorescent Protein as Selectable Marker of Retroviral-Mediated Gene Transfer in Immature Hematopoietic Bone Marrow Cells

Blood ◽  
1997 ◽  
Vol 90 (9) ◽  
pp. 3304-3315 ◽  
Author(s):  
Marti F.A. Bierhuizen ◽  
Yvonne Westerman ◽  
Trudi P. Visser ◽  
Wati Dimjati ◽  
Albertus W. Wognum ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Green Fluorescent Protein ◽  
Gene Transfer ◽  
Fluorescent Protein ◽  
Bone Marrow Cells ◽  
Retroviral Vector ◽  
Egfp Expression ◽  
Green Fluorescent ◽  
Marrow Cells

Abstract The further improvement of gene transfer into hematopoietic stem cells and their direct progeny will be greatly facilitated by markers that allow rapid detection and efficient selection of successfully transduced cells. For this purpose, a retroviral vector was designed and tested encoding a recombinant version of the Aequorea victoria green fluorescent protein that is enhanced for high-level expression in mammalian cells (EGFP). Murine cell lines (NIH 3T3, Rat2) and bone marrow cells transduced with this retroviral vector demonstrated a stable green fluorescence signal readily detectable by flow cytometry. Functional analysis of the retrovirally transduced bone marrow cells showed EGFP expression in in vitro clonogenic progenitors (GM-CFU), day 13 colony-forming unit-spleen (CFU-S), and in peripheral blood cells and marrow repopulating cells of transplanted mice. In conjunction with fluorescence-activated cell sorting (FACS) techniques EGFP expression could be used as a marker to select for greater than 95% pure populations of transduced cells and to phenotypically define the transduced cells using antibodies directed against specific cell-surface antigens. Detrimental effects of EGFP expression were not observed: fluorescence intensity appeared to be stable and hematopoietic cell growth was not impaired. The data show the feasibility of using EGFP as a convenient and rapid reporter to monitor retroviral-mediated gene transfer and expression in hematopoietic cells, to select for the genetically modified cells, and to track these cells and their progeny both in vitro and in vivo.

scholarly journals Recombinant Green Fluorescent Protein-Expressing Human Cytomegalovirus as a Tool for Screening Antiviral Agents

2000 ◽  
Vol 44 (6) ◽  
pp. 1588-1597 ◽  
Author(s):  
Manfred Marschall ◽  
Martina Freitag ◽  
Sigrid Weiler ◽  
Gabriele Sorg ◽  
Thomas Stamminger
Keyword(s):  
Green Fluorescent Protein ◽  
Human Cytomegalovirus ◽  
Fluorescent Protein ◽  
Antiviral Agents ◽  
Inhibitory Effects ◽  
Plaque Reduction Assay ◽  
Human Fibroblast Cultures ◽  
Antiviral Activities ◽  
Green Fluorescent

ABSTRACT A recombinant human cytomegalovirus (AD169-GFP) expressing green fluorescent protein was generated by homologous recombination. Infection of human fibroblast cultures with AD169-GFP virus produced stable and readily detectable amounts of GFP signals which were quantitated by automated fluorometry. Hereby, high levels of sensitivity and reproducibility could be achieved, compared to those with the conventional plaque reduction assay. Antiviral activities were determined for four reference compounds as well as a set of putative novel cytomegalovirus inhibitors. The results obtained were exactly in line with the known characteristics of reference compounds and furthermore revealed distinct antiviral activities of novel in vitro inhibitors. The fluorometric data could be confirmed by GFP-based flow cytometry and fluorescence microscopy. In addition, laboratory virus variants derived from the recombinant AD169-GFP virus provided further possibilities for study of the characteristics of drug resistance. The GFP-based antiviral assay appeared to be very reliable for measuring virus-inhibitory effects in concentration- and time-dependent fashions and might also be adaptable for high-throughput screenings of cytomegalovirus-specific antiviral agents.

432 INHERITANCE OF LENTIVIRAL PHOSPHOGLYCERATE KINASE-ENHANCED GREEN FLUORESCENT PROTEIN (PGK-eGFP) INTEGRANTS OF TRANSGENIC CATTLE

2010 ◽  
Vol 22 (1) ◽  
pp. 373
Author(s):  
M. Reichenbach ◽  
F. A. Habermann ◽  
H. D. Reichenbach ◽  
T. Guengoer ◽  
F. Weber ◽  
...  
Keyword(s):  
Green Fluorescent Protein ◽  
Enhanced Green Fluorescent Protein ◽  
Fluorescent Protein ◽  
Germ Line ◽  
Phosphoglycerate Kinase ◽  
Healthy Male ◽  
Transgenic Founder ◽  
Green Fluorescent

An alternative approach to classic techniques for the generation of transgenic livestock is the use of viral vectors. Using lentiviral vectors (LV) we previously generated transgenic founder cattle with integrants carrying phosphoglycerate kinase (PGK) promoter-enhanced green fluorescent protein (eGFP) expression cassettes (Hofmann et al. 2004 Biol. Reprod. 71, 405-409). The aim of this work was to investigate the transmission of LV-PGK-eGFP integrants through the female and male germ line of transgenic founder cattle in resulting embryos, fetuses, and offspring. The female founder animal was superovulated and artificially inseminated with a nontransgenic bull. Six of the 16 embryos obtained were transferred to synchronized recipient heifers, resulting in 2 pregnancies and birth of 1 healthy male transgenic calf, expressing eGFP as detected by in vivo imaging and real-time PCR. Cryopreserved semen of the founder bull and matured COC of nontransgenic cows were used for in vitro embryo production as previously described by Hiendleder et al. (2004 Biol. Reprod. 71, 217-223). The rates of cleavage and development to blastocysts in vitro corresponded to 52.3 ± 3.8% and 23.5 ± 4.6%, respectively. In vivo expression of eGFP was observed at blastocyst stage (Day 7 after IVF) and was seen in 93.8% (198/211) of all blastocysts. Twenty-four eGFP-positive embryos were transferred to 9 synchronized recipients. Analysis of 2 embryos flushed on Day 15, 2 fetuses recovered on Day 45, and a healthy male transgenic calf revealed consistent high-level expression of eGFP in all tissues investigated. These observations show for the first time transmission of lentiviral integrants through the germ line of female and male transgenic founder cattle. Although eGFP transgenic cattle have been produced before by nuclear transfer from transfected cells, lentiviral transgenesis has the advantage that only one copy of the provirus is integrated at a particular chromosomal integration site. High-fidelity expression of eGFP in embryos, fetuses, and offspring of founders provides an interesting tool for developmental studies in cattle, including interactions of gametes, embryos, and fetuses with their maternal environment.

Cryptococcus neoformans Differential Gene Expression Detected In Vitro and In Vivo with Green Fluorescent Protein

1999 ◽  
Vol 67 (4) ◽  
pp. 1812-1820
Author(s):  
Maurizio del Poeta ◽  
Dena L. Toffaletti ◽  
Thomas H. Rude ◽  
Sara D. Sparks ◽  
Joseph Heitman ◽  
...  
Keyword(s):  
Gene Expression ◽  
Green Fluorescent Protein ◽  
Cryptococcus Neoformans ◽  
Differential Gene Expression ◽  
Fluorescent Protein ◽  
Differential Gene ◽  
Green Fluorescent

Supercharged green fluorescent protein delivers HPV16E7 DNA and protein into mammalian cells in vitro and in vivo

2018 ◽  
Vol 194 ◽  
pp. 29-39 ◽  
Author(s):  
Fatemeh Motevalli ◽  
Azam Bolhassani ◽  
Shilan Hesami ◽  
Sepideh Shahbazi
Keyword(s):  
Green Fluorescent Protein ◽  
Mammalian Cells ◽  
Fluorescent Protein ◽  
Green Fluorescent

scholarly journals Inhibition of Salmonella Binding to Porcine Intestinal Cells by a Wood-Derived Prebiotic

2020 ◽  
Vol 8 (7) ◽  
pp. 1051 ◽  
Author(s):  
Aleksandar Božić ◽  
Robin C. Anderson ◽  
Tawni L. Crippen ◽  
Christina L. Swaggerty ◽  
Michael E. Hume ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Green Fluorescent Protein ◽  
Fluorescent Protein ◽  
Saccharomyces Boulardii ◽  
Binding Activity ◽  
Intestinal Cells ◽  
E Coli ◽  
Enteric Infections ◽  
Green Fluorescent

Numerous Salmonella enterica serovars can cause disease and contamination of animal-produced foods. Oligosaccharide-rich products capable of blocking pathogen adherence to intestinal mucosa are attractive alternatives to antibiotics as these have potential to prevent enteric infections. Presently, a wood-derived prebiotic composed mainly of glucose-galactose-mannose-xylose oligomers was found to inhibit mannose-sensitive binding of select Salmonella Typhimurium and Escherichia coli strains when reacted with Saccharomyces boulardii. Tests for the ability of the prebiotic to prevent binding of a green fluorescent protein (GFP)-labeled S. Typhimurium to intestinal porcine epithelial cells (IPEC-J2) cultured in vitro revealed that prebiotic-exposed GFP-labeled S. Typhimurium bound > 30% fewer individual IPEC-J2 cells than did GFP-labeled S. Typhimurium having no prebiotic exposure. Quantitatively, 90% fewer prebiotic-exposed GFP-labeled S. Typhimurium cells were bound per individual IPEC-J2 cell compared to non-prebiotic exposed GFP-labeled S. Typhimurium. Comparison of invasiveness of S. Typhimurium DT104 against IPEC-J2 cells revealed greater than a 90% decrease in intracellular recovery of prebiotic-exposed S. Typhimurium DT104 compared to non-exposed controls (averaging 4.4 ± 0.2 log10 CFU/well). These results suggest compounds within the wood-derived prebiotic bound to E. coli and S. Typhimurium-produced adhesions and in the case of S. Typhimurium, this adhesion-binding activity inhibited the binding and invasion of IPEC-J2 cells.

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