Lentiviral Vector Transduction of Fetal Mesenchymal Stem Cells

Human adipose-derived stem cells (hADSCs) are multipotent mesenchymal cells that can differentiate into adipocytes, chondrocytes, and osteocytes. During osteoblastogenesis, the osteoprogenitor cells differentiate into mature osteoblasts and synthesize bone matrix components. Zinc finger protein 521 (ZNF521/Zfp521) is a transcription co-factor implicated in the regulation of hematopoietic, neural, and mesenchymal stem cells, where it has been shown to inhibit adipogenic differentiation. The present study is aimed at determining the effects of ZNF521 on the osteoblastic differentiation of hADSCs to clarify whether it can influence their osteogenic commitment. The enforced expression or silencing of ZNF521 in hADSCs was achieved by lentiviral vector transduction. Cells were cultured in a commercial osteogenic medium for up to 20 days. The ZNF521 enforced expression significantly reduced osteoblast development as assessed by the morphological and molecular criteria, resulting in reduced levels of collagen I, alkaline phosphatase, osterix, osteopontin, and calcium deposits. Conversely, ZNF521 silencing, in response to osteoblastic stimuli, induced a significant increase in early molecular markers of osteogenesis and, at later stages, a remarkable enhancement of matrix mineralization. Together with our previous findings, these results show that ZNF521 inhibits both adipocytic and osteoblastic maturation in hADSCs and suggest that its expression may contribute to maintaining the immature properties of hADSCs.

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Effect of lentivirus-mediated growth and differentiation factor-5 transfection on differentiation of rabbit nucleus pulposus mesenchymal stem cells

European Journal of Medical Research ◽

10.1186/s40001-021-00624-5 ◽

2022 ◽

Vol 27 (1) ◽

Author(s):

Kun Zhu ◽

Rui Zhao ◽

Yuchen Ye ◽

Gang Xu ◽

Changchun Zhang

Keyword(s):

Stem Cells ◽

Mesenchymal Stem Cells ◽

Nucleus Pulposus ◽

Lentiviral Vector ◽

The Other ◽

Cell Phenotype ◽

Mrna Levels ◽

Qrt Pcr ◽

Differentiation Factor ◽

Gdf5 Gene

Abstract Background Intervertebral disc degeneration (IDD) is a natural progression of age-related processes. Associated with IDD, degenerative disc disease (DDD) is a pathologic condition implicated as a major cause of chronic lower back pain, which can have a severe impact on the quality of life of patients. As degeneration progression is associated with elevated levels of inflammatory cytokines, enhanced aggrecan and collagen degradation, and changes in the disc cell phenotype. The purpose of this study was to investigate the biological and cytological characteristics of rabbit nucleus pulposus mesenchymal stem cells (NPMSCs)—a key factor in IDD—and to determine the effect of the growth and differentiation factor-5 (GDF5) on the differentiation of rabbit NPMSCs transduced with a lentivirus vector. Methods An in vitro culture model of rabbit NPMSCs was established and NPMSCs were identified by flow cytometry (FCM) and quantitative real-time PCR (qRT-PCR). Subsequently, NPMSCs were randomly divided into three groups: a transfection group (the lentiviral vector carrying GDF5 gene used to transfect NPMSCs); a control virus group (the NPMSCs transfected with an ordinary lentiviral vector); and a normal group (the NPMSCs alone). FCM, qRT-PCR, and western blot (WB) were used to detect the changes in NPMSCs. Results The GDF5-transfected NPMSCs displayed an elongated shape, with decreased cell density, and significantly increased GDF5 positivity rate in the transfected group compared to the other two groups (P < 0.01). The mRNA levels of Krt8, Krt18, and Krt19 in the transfected group were significantly higher in comparison with the other two groups (P < 0.01), and the WB results were consistent with that of qRT-PCR. Conclusions GDF5 could induce the differentiation of NPMSCs. The lentiviral vector carrying the GDF5 gene could be integrated into the chromosome genome of NPMSCs and promoted differentiation of NPMSCs into nucleus pulposus cells. Our findings advance the development of feasible and effective therapies for IDD.

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Abstract 403: Tracking the Migration of Porcine Mesenchymal Stem Cells with the MRI Contrast Agent Ferex in an AAA Model

Arteriosclerosis Thrombosis and Vascular Biology ◽

10.1161/atvb.32.suppl_1.a403 ◽

2012 ◽

Vol 32 (suppl_1) ◽

Author(s):

Rami Tadros ◽

Bhakti Rawal ◽

Karen Briley-Saebo ◽

David O’Connor ◽

Dan Han ◽

...

Keyword(s):

Stem Cells ◽

Mesenchymal Stem Cells ◽

Contrast Agent ◽

Lentiviral Vector ◽

Relaxation Times ◽

Mri Contrast Agent ◽

Signal Loss ◽

Post Transplantation ◽

Mri Contrast

Introduction: Mesenchymal stem cells (MSC) are being investigated in porcine abdominal aortic aneurysm (PAAA) models for their repair potential. This study uses MSCs labeled with the MRI contrast agent Ferex to non-invasively evaluate MSC migration in-vivo. Methods: MSCs from 6 pigs were isolated from bone marrow via Ficoll Paque separation and expanded in culture. Using a Lentiviral vector, MSC from all 6 pigs were transfected with green florescent protein (GFP). MSCs from 4 of these pigs were also labeled with 200μg/ml Ferex using Poly-L-Lysine and then analyzed for Ferex uptake and viability. Preservation of the MSC phenotype was confirmed using flow cytometry by detecting positive CD90 and negative CD45 and CD117. Transmission electron microscopy established that Ferex localized to lysosomes. MSCs were then injected into the adventitia of the PAAA. In-vivo MRI was performed using multiple echo gradient echo sequences. Effective transverse relaxation times (T2* values) were calculated on a pixel-by-pixel basis as a function of time post cell transplantation. Results: Ferex labeled MSCs were visible post transplantation at 4, 11, 15 and 21 days using MRI. The MRI signal void (decreased T2* values) correlated with the presence of Ferex within the PAAA. This signal loss progressively expanded circumferentially at each study interval representing cellular movement. MSC migration and localization were confirmed with GFP visualization on fluorescence microscopy and immunohistochemistry. In-vivo MRI signals also correlate with iron deposition on Perl’s stain. Conclusion: Ferex can be used as an in-vivo tracking agent of MSCs in PAAA models.

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Transduction of mesenchymal stem cells with an ecdysone inductible lentiviral vector expressing luciferase gene

Acta Ophthalmologica ◽

10.1111/j.1755-3768.2011.202.x ◽

2011 ◽

Vol 89 (s248) ◽

pp. 0-0

Author(s):

A FAVARD ◽

D BELLICAUD ◽

Y NOCHEZ ◽

C COLLIN ◽

PJ PISELLA ◽

...

Keyword(s):

Stem Cells ◽

Mesenchymal Stem Cells ◽

Lentiviral Vector ◽

Luciferase Gene

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GDF11 enhances therapeutic functions of mesenchymal stem cells for angiogenesis

Stem Cell Research & Therapy ◽

10.1186/s13287-021-02519-y ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Chi Zhang ◽

Yinuo Lin ◽

Ke Zhang ◽

Luyang Meng ◽

Xinyang Hu ◽

...

Keyword(s):

Stem Cells ◽

Mesenchymal Stem Cells ◽

Stem Cell ◽

Growth Factor ◽

Transforming Growth Factor ◽

Lentiviral Vector ◽

Retention Rate ◽

Antibody Array ◽

Mouse Bone Marrow ◽

Control Mscs

Abstract Background The efficacy of stem cell therapy for ischemia repair has been limited by low cell retention rate. Growth differentiation factor 11 (GDF11) is a member of the transforming growth factor-β super family, which has multiple effects on development, physiology and diseases. The objective of the study is to investigate whether GDF11 could affect the efficacy of stem cell transplantation. Methods We explored the effects of GDF11 on proangiogenic activities of mesenchymal stem cells (MSCs) for angiogenic therapy in vitro and in vivo. Results Mouse bone marrow-derived MSCs were transduced with lentiviral vector to overexpress GDF11 (MSCGDF11). After exposed to hypoxia and serum deprivation for 48 h, MSCGDF11 were significantly better in viability than control MSCs (MSCvector). MSCGDF11 also had higher mobility and better angiogenic paracrine effects. The cytokine antibody array showed more angiogenic cytokines in the conditioned medium of MSCGDF11 than that of MSCvector, such as epidermal growth factor, platelet-derived growth factor-BB, placenta growth factor. When MSCs (1 × 106 cells in 50 μl) were injected into ischemic hindlimb of mice after femoral artery ligation, MSCGDF11 had higher retention rate in the muscle than control MSCs. Injection of MSCGDF11 resulted in better blood reperfusion and limb salvage than that of control MSCs after 14 days. Significantly more CD31+ endothelial cells and α-SMA + smooth muscle cells were detected in the ischemic muscles that received MSCGDF11. The effects of GDF11 were through activating TGF-β receptor and PI3K/Akt signaling pathway. Conclusion Our study demonstrated an essential role of GDF11 in promoting therapeutic functions of MSCs for ischemic diseases by enhancing MSC viability, mobility, and angiogenic paracrine functions.

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Effect of Lentivirus-mediated GDF5 Transfection on Differentiation of Rabbit Nucleus Pulposus Mesenchymal Stem Cells

10.21203/rs.3.rs-40034/v1 ◽

2020 ◽

Author(s):

kun zhu ◽

Rui Zhao ◽

Yuchen Ye ◽

Gang Xu ◽

Changchun Zhang

Keyword(s):

Stem Cells ◽

Mesenchymal Stem Cells ◽

Nucleus Pulposus ◽

Lentiviral Vector ◽

Intervertebral Discs ◽

Degenerative Disease ◽

The Other ◽

Control Group ◽

Nucleus Pulposus Cells ◽

Qrt Pcr

Abstract Background: Disc degenerative disease is a common senile degenerative disease, which seriously affects the quality of life of patients.The purpose of this study is to observe the biological and cytological characteristics of rabbit nucleus pulposus mesenchymal stem cells (NPMSCs), and to determine the effect of growth differentiation factor 5(GDF5) on the differentiation of rabbit NPMSCs by lentivirus transfection.Methods: In vitro culture model of rabbit NPMSCs was established and NPMSCs cells were identified by flow cytometry (FCM)and quantitative real-time PCR(qRT-PCR). Then NPMSCs were divided into three groups: lentiviral vector carrying GDF5 was used to transfect NPMSCs, to determine the transfection rate, which was recorded as transfection group, and the NPMSCs transfected with ordinary lentiviral vector was recorded as control group, NPMSCs without processing was recorded as normal group. FCM, qRT-PCR and Western Blot(WB) were used to detected the change of NPMSCs.Results: The transfected NPMSCs by GDF5 became longer and narrower, and the cell density decreased,and the positive rate of GDF5 in the transfected group was significantly higher than that in the other two groups (P<0.05). The mRNA expression of KRT8, KRT18, KRT19 in the transfected group was significantly higher than the other two groups(P<0.05),the result of WB were the same to qRT-PCR. Conclusions: GDF5 can induce the differentiation of NPMSCs and repair degenerative intervertebral discs. Lentiviral vector carrying GDF5 can be integrated into the chromosome genome of NPMSCs and promote differentiation of NPMSCs into nucleus pulposus cells(NPCs).

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