scholarly journals In Vivo Piggybac-Based Gene Delivery towards Murine Pancreatic Parenchyma Confers Sustained Expression of Gene of Interest

2019 ◽  
Vol 20 (13) ◽  
pp. 3116 ◽  
Author(s):  
Masahiro Sato ◽  
Emi Inada ◽  
Issei Saitoh ◽  
Shingo Nakamura ◽  
Satoshi Watanabe
Keyword(s):  
Gene Expression ◽  
Gene Delivery ◽  
Fluorescent Protein ◽  
Consensus Sequence ◽  
Constitutive Expression ◽  
Endocrine System ◽  
Stable Gene ◽  
Pancreatic Cells ◽  
Glandular Organ

The pancreas is a glandular organ that functions in the digestive system and endocrine system of vertebrates. The most common disorders involving the pancreas are diabetes, pancreatitis, and pancreatic cancer. In vivo gene delivery targeting the pancreas is important for preventing or curing such diseases and for exploring the biological function of genes involved in the pathogenesis of these diseases. Our previous experiments demonstrated that adult murine pancreatic cells can be efficiently transfected by exogenous plasmid DNA following intraparenchymal injection and subsequent in vivo electroporation using tweezer-type electrodes. Unfortunately, the induced gene expression was transient. Transposon-based gene delivery, such as that facilitated by piggyBac (PB), is known to confer stable integration of a gene of interest (GOI) into host chromosomes, resulting in sustained expression of the GOI. In this study, we investigated the use of the PB transposon system to achieve stable gene expression when transferred into murine pancreatic cells using the above-mentioned technique. Expression of the GOI (coding for fluorescent protein) continued for at least 1.5 months post-gene delivery. Splinkerette-PCR-based analysis revealed the presence of the consensus sequence TTAA at the junctional portion between host chromosomes and the transgenes; however, this was not observed in all samples. This plasmid-based PB transposon system enables constitutive expression of the GOI in pancreas for potential therapeutic and biological applications.

Gene Expression in Synovial Membrane Cells After Intraarticular Delivery of Plasmid-Linked Superparamagnetic Iron Oxide Particles—A Preliminary Study in Sheep

2006 ◽  
Vol 6 (9) ◽  
pp. 2841-2852 ◽  
Author(s):  
Larry D. Galuppo ◽  
Sarah W. Kamau ◽  
Benedikt Steitz ◽  
Paul O. Hassa ◽  
Monika Hilbe ◽  
...  
Keyword(s):  
Gene Expression ◽  
Iron Oxide ◽  
Gene Delivery ◽  
Synovial Membrane ◽  
Fluorescent Protein ◽  
Fluorescent Proteins ◽  
Superparamagnetic Iron Oxide ◽  
Oxide Nanoparticles ◽  
Positive Evidence

This study evaluated in vivo gene delivery and subsequent gene expression within cells of the synovium in the presence of static and pulsating magnetic field application following intraarticular injection of superparamagnetic iron oxide nanoparticles linked to plasmids containing reporter genes encoding for fluorescent proteins. Plasmids encoding genes for either green fluorescent protein or red fluorescent protein were bound to superparamagnetic nanoparticles coated with polyethyleneimine. Larger (200–250 nm) and smaller (50 nm) nanoparticles were compared to evaluate the effects of size on transfection efficiency as well as any associated intraarticular reaction. Comparisons between groups were evaluated at 24, 72, and 120 h time periods. Inflammatory response was mild to moderate for all injected particles, but was present in the majority of synovial membrane samples evaluated. Larger particles tended to be associated with more inflammation than smaller ones. Nevertheless, intraarticular application of both experimental and control nanoparticles were well tolerated clinically. Gene expression as determined by observation of either green or red intracellular fluorescence was difficult to assess by both epifluorescent light, and confocal microscopy. An insufficient concentration of nanoparticles in relation to joint volume likely resulted in a limited number of samples with positive evidence of iron staining and with suspected positive evidence of cells expressing fluorescent proteins. Our results indicate that intraarticular administration of functionalized superparamagnetic iron oxide nanoparticles resulted in a mild to moderate synovitis and there was in conclusive evidence of gene expression. Further research is warranted to determine the best and most effective reporter assay for assessment of the in vivo gene delivery into the joints. In addition, the best suited concentration and size of nanoparticles, which will optimize gene delivery and expression, while minimizing intraarticular inflammation, needs to be determined.

scholarly journals Downregulation of Prdm16 mRNA is a specific antileukemic mechanism during HOXB4-mediated HSC expansion in vivo

Blood ◽  
2014 ◽  
Vol 124 (11) ◽  
pp. 1737-1747 ◽  
Author(s):  
Hui Yu ◽  
Geoffrey Neale ◽  
Hui Zhang ◽  
Han M. Lee ◽  
Zhijun Ma ◽  
...  
Keyword(s):  
Gene Expression ◽  
Stable Gene ◽  
Self Renewal ◽  
Key Points ◽  
Stable Gene Expression

Key Points HOXB4 induces stable gene expression changes in transplanted HSCs that drive balanced self-renewal and differentiation divisions. Marked downregulation of Prdm16 occurs concurrently with HOXB4-mediated HSC expansion and functions to prevent leukemia in vivo.

scholarly journals Nontypeable Haemophilus influenzae Gene Expression Induced In Vivo in a Chinchilla Model of Otitis Media

2003 ◽  
Vol 71 (6) ◽  
pp. 3454-3462 ◽  
Author(s):  
Kevin M. Mason ◽  
Robert S. Munson ◽  
Lauren O. Bakaletz
Keyword(s):  
Gene Expression ◽  
Haemophilus Influenzae ◽  
Otitis Media ◽  
Middle Ear ◽  
Fluorescent Protein ◽  
Otitis Media With Effusion ◽  
Acute Otitis Media ◽  
Bacterial Gene ◽  
Nthi Strain

ABSTRACT The gram-negative bacterium nontypeable Haemophilus influenzae (NTHI) is the predominant pathogen in chronic otitis media with effusion and, with Streptococcus pneumoniae and Moraxella catarrhalis, is a causative agent of acute otitis media. To identify potential virulence determinants, bacterial gene expression was monitored by differential fluorescence induction during early disease progression in one specific anatomical niche of a chinchilla model of NTHI-induced otitis media. Genomic DNA fragments from NTHI strain 86-028NP were cloned upstream of the promoterless gfpmut3 gene. NTHI strain 86-028NP served as the host for the promoter trap library. Pools of 2,000 transformants were inoculated into the left and right middle ear cavities of chinchillas. Middle ear effusions were recovered by epitympanic tap at 24 and 48 h, and clones containing promoter elements that were induced in vivo and producing green fluorescent protein were isolated by two-color fluorescence-activated cell sorting. Insert DNA was sequenced and compared to the complete genome sequence of H. influenzae strain Rd. In a screen of 16,000 clones, we have isolated 44 clones that contain unique gene fragments encoding biosynthetic enzymes, metabolic and regulatory proteins, and hypothetical proteins of unknown function. An additional eight clones contain gene fragments unique to our NTHI isolate. Using quantitative reverse transcription-PCR, we have confirmed that 26 clones demonstrated increased gene expression in vivo relative to expression in vitro. These data provide insight into the response of NTHI bacteria as they sense and respond to the middle ear microenvironment during early events of otitis media.

scholarly journals Moderate and intensive mechanical loading differentially modulate the phenotype of tendon stem/progenitor cells in vivo

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0242640
Author(s):  
Jianying Zhang ◽  
Daibang Nie ◽  
Kelly Williamson ◽  
Arthur McDowell ◽  
MaCalus V. Hogan ◽  
...  
Keyword(s):  
Gene Expression ◽  
Progenitor Cells ◽  
Cell Morphology ◽  
Fluorescent Protein ◽  
Treadmill Running ◽  
Whole Body ◽  
Tendon Cells ◽  
Elevated Expression ◽  
Green Fluorescent

To examine the differential mechanobiological responses of specific resident tendon cells, we developed an in vivo model of whole-body irradiation followed by injection of either tendon stem/progenitor cells (TSCs) expressing green fluorescent protein (GFP-TSCs) or mature tenocytes expressing GFP (GFP-TNCs) into the patellar tendons of wild type C57 mice. Injected mice were subjected to short term (3 weeks) treadmill running, specifically moderate treadmill running (MTR) and intensive treadmill running (ITR). In MTR mice, both GFP-TSC and GFP-TNC injected tendons maintained normal cell morphology with elevated expression of tendon related markers collagen I and tenomodulin. In ITR mice injected with GFP-TNCs, cells also maintained an elongated shape similar to the shape found in normal/untreated control mice, as well as elevated expression of tendon related markers. However, ITR mice injected with GFP-TSCs showed abnormal changes, such as cell morphology transitioning to a round shape, elevated chondrogenic differentiation, and increased gene expression of non-tenocyte related genes LPL, Runx-2, and SOX-9. Increased gene expression data was supported by immunostaining showing elevated expression of SOX-9, Runx-2, and PPARγ. This study provides evidence that while MTR maintains tendon homeostasis by promoting the differentiation of TSCs into TNCs, ITR causes the onset of tendinopathy development by inducing non-tenocyte differentiation of TSCs, which may eventually lead to the formation of non-tendinous tissues in tendon tissue after long term mechanical overloading conditions on the tendon.

scholarly journals Identification of a Novel Virulence Factor in Recombinant Pneumonia Virus of Mice

2007 ◽  
Vol 81 (17) ◽  
pp. 9490-9501 ◽  
Author(s):  
Christine D. Krempl ◽  
Anna Wnekowicz ◽  
Elaine W. Lamirande ◽  
Giw Nayebagha ◽  
Peter L. Collins ◽  
...  
Keyword(s):  
Virulence Factor ◽  
Reverse Genetics ◽  
Fluorescent Protein ◽  
Vaccine Development ◽  
Virulent Strain ◽  
Consensus Sequence ◽  
Cytoplasmic Tail ◽  
Syncytial Virus

ABSTRACT Pneumonia virus of mice (PVM) is a murine relative of human respiratory syncytial virus (HRSV). Here we developed a reverse genetics system for PVM based on a consensus sequence for virulent strain 15. Recombinant PVM and a version engineered to express green fluorescent protein replicated as efficiently as the biological parent in vitro but were 4- and 12.5-fold attenuated in vivo, respectively. The G proteins of HRSV and PVM have been suggested to contribute to viral pathogenesis, but this had not been possible to study in a defined manner in a fully permissive host. As a first step, we evaluated recombinant mutants bearing a deletion of the entire G gene (ΔG) or expressing a G protein lacking its cytoplasmic tail (Gt). Both G mutants replicated as efficiently in vitro as their recombinant parent, but both were nonpathogenic in mice at doses that would otherwise be lethal. We could not detect replication of the ΔG mutant in mice, indicating that its attenuation is based on a severe reduction in the virus load. In contrast, the Gt mutant appeared to replicate as efficiently in mice as its recombinant parent. Thus, the reduction in virulence associated with the Gt mutant could not be accounted for by a reduction in viral replication. These results identified the cytoplasmic tail of G as a virulence factor whose effect is not mediated solely by the viral load. In addition to its intrinsic interest, a recombinant virus that replicates with wild-type-like efficiency but does not cause disease defines optimal properties for vaccine development.

scholarly journals Foxa2 Controls Pdx1 Gene Expression in Pancreatic  -Cells In Vivo

Diabetes ◽  
2002 ◽  
Vol 51 (8) ◽  
pp. 2546-2551 ◽  
Author(s):  
C. S. Lee ◽  
N. J. Sund ◽  
M. Z. Vatamaniuk ◽  
F. M. Matschinsky ◽  
D. A. Stoffers ◽  
...  
Keyword(s):  
Gene Expression ◽  
Pancreatic Cells

Abstract 39: Adrenal ßArrestin1 Raises Serum Aldosterone Levels And Blood Pressure, Both Significant Stroke Risk Factors, In Experimental Rats And Mice

Stroke ◽  
2013 ◽  
Vol 44 (suppl_1) ◽  
Author(s):  
Anastasios Lymperopoulos ◽  
Ashley Bathgate ◽  
Norma C Salazar
Keyword(s):  
Blood Pressure ◽  
Angiotensin Ii ◽  
Gene Delivery ◽  
Adrenal Cortex ◽  
Stroke Risk ◽  
Fluorescent Protein ◽  
Serum Aldosterone ◽  
Increased Risk ◽  
In Vivo Gene Delivery

Introduction: It is widely accepted nowadays that elevation of serum levels of aldosterone, a mineralocorticoid hormone with toxic effects in several cardiovascular tissues, including the heart and cerebral blood vessels, can significantly raise stroke risk. The success of mineralocorticoid receptor blockers, such as eplerenone, at preventing stroke attacks attests to this. Aldosterone is normally produced and secreted by the adrenal cortex in response to angiotensin II. We recently reported that adrenal βarrestin1 (βarr1) plays a crucial role in the physiological angiotensin II-stimulated aldosterone production in the adrenal cortex, leading to marked elevation of circulating serum aldosterone levels in vivo (Lymperopoulos A. et al., Proc. Natl. Acad. Sci. USA. 2009;106:5825-5830). Hypothesis: Herein, we examined the potential impact of this adrenal βarr1-dependent aldosterone elevation on stroke risk in experimental animals in vivo. Methods: We used the βarr1 knockout (βarr1KO) mouse model, studying it alongside wild type (WT) control mice, and also adult male Sprague-Dawley rats, in which adrenal βarr1 was overexpressed in vivo via adrenal-targeted adenoviral-mediated βarr1 gene transfer. Serum aldosterone was measured by ELISA and blood pressure via telemetry. Results: Serum aldosterone at 7 days post-in vivo gene delivery was markedly elevated in adrenal βarr1-overexpressing rats (536+50 pg/ml), compared to control rats receiving the green fluorescent protein (GFP) adenoviral transgene (235+40 pg/ml, p<0.05, n=5). This translated to a significant increase in mean arterial pressure of the βarr1-overexpressing rats (155+5 mmHg) compared to control GFP-expressing rats (137+8 mmHg, p<0.05, n=5), again at 7 days post-in vivo gene delivery, which was prevented by concurrent eplerenone treatment. In contrast, βarr1KO mice had significantly lower serum aldosterone levels (270+20 pg/ml) compared to WT controls (498+35 pg/ml, p<0.05, n=5), at 4 weeks post-experimental myocardial infarction. Conclusions: Adrenal βarr1 up-regulation can dramatically increase circulating aldosterone levels and systemic blood pressure, thus conferring increased risk for stroke in experimental rodents.

Kallistatin Inhibits Endothelial Cell Proliferation, Migration and Adhesion in Vitro and Angiogenesis in the Ischemic Hindlimb of Rats

Hypertension ◽  
2000 ◽  
Vol 36 (suppl_1) ◽  
pp. 706-707
Author(s):  
Robert Q Miao ◽  
Jun Agata ◽  
Lee Chao ◽  
Julie Chao
Keyword(s):  
Cell Proliferation ◽  
Endothelial Cell ◽  
Gene Delivery ◽  
Fluorescent Protein ◽  
Regional Blood Flow ◽  
Endothelial Cell Proliferation ◽  
Hek 293

P76 Kallistatin is a serine proteinase inhibitor (serpin) which has multifunctions including regulation of tissue kallikrein activity, blood pressure, inflammation and neointima hyperplasia. In this study, we investigated the potential role of kallistatin in vascular biology by studying its effects on the proliferation, migration and adhesion of cultured primary human endothelial cells in vitro, and angiogenesis in the ischemic hindlimb of rats. Purified kallistatin significantly inhibits cultured endothelial cell proliferation, migration and adhesion induced by VEGF or bFGF. To further investigate the role of kallistatin in vascular growth in vivo, we prepared adenovirus carrying the human kallistatin gene under the control of the cytomegalovirus promoter/enhancer (Ad.CMV-cHKBP). Expression of recombinant human kallistatin in HEK 293 cells transfected with Ad.CMV-cHKBP was identified by a specific ELISA. The effect of adenovirus-mediated kallistatin gene delivery on angiogenesis was evaluated in a rat model of hindlimb ischemia. Adenovirus carrying the human kallistatin or green fluorescent protein (GFP) gene were injected locally into the ischemic adductor at the time of surgery. Histological and morphometric analysis at 14 days post injection showed that adenovirus-mediated kallistatin gene delivery significantly reduced capillary density in the ischemic muscle as compared to that of control rats injected with GFP. The anti-angiogenic effect of kallistatin was associated with reduced regional blood flow in the ischemic hindlimb measured by microsphere assays. Expression of human kallistatin was identified in the injected muscle and immunoreactive human kallistatin levels were measured in the muscle and in the circulation of rats following kallistatin gene delivery. These results demonstrate a novel role of kallistatin in the inhibition of angiogenesis and in vascular remodeling.

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

scholarly journals Identification of Upstream Sequences Essential for Activation of a Bacteriophage P2 Late Promoter

2003 ◽  
Vol 185 (15) ◽  
pp. 4609-4614 ◽  
Author(s):  
Gail E. Christie ◽  
Douglas L. Anders ◽  
Victor McAlister ◽  
Tina S. Goodwin ◽  
Bryan Julien ◽  
...  
Keyword(s):  
Consensus Sequence ◽  
Critical Role ◽  
Constitutive Expression ◽  
Upstream Region ◽  
Activation Of Transcription ◽  
Bacteriophage P2 ◽  
Dyad Symmetry ◽  
Rna Polymerase Holoenzyme

ABSTRACT We have carried out a mutational scan of the upstream region of the bacteriophage P2 FETUD late operon promoter, PF, which spans an element of hyphenated dyad symmetry that is conserved among all six of the P2 and P4 late promoters. All mutants were assayed for activation by P4 Delta in vivo, by using a lacZ reporter plasmid, and a subset of mutants was assayed in vitro for Delta binding. The results confirm the critical role of the three complementary nucleotides in each half site of the upstream element for transcription factor binding and for activation of transcription. A trinucleotide DNA recognition site is consistent with a model in which these transcription factors bind via a zinc finger motif. The mutational scan also led to identification of the −35 region of the promoter. Introduction of a σ70 −35 consensus sequence resulted in increased constitutive expression, which could be further stimulated by Delta. These results indicate that activator binding to the upstream region of P2 late promoters compensates in part for poor σ70 contacts and helps to recruit RNA polymerase holoenzyme.

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