scholarly journals Expression and Role of Oct3/4 in Injury-Repair Process of Rat Alveolar Epithelium after 5-Fu Treatment

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Wen-ya Li ◽  
Xu-lv Ye ◽  
Xin-shan Jia ◽  
Lan-ling Jia
Keyword(s):  
Stem Cells ◽  
Embryonic Stem ◽  
Alveolar Epithelium ◽  
Repair Process ◽  
Lung Epithelial Cells ◽  
Clara Cell ◽  
Epithelial Stem Cells ◽  
Injury Repair ◽  
Alveolar Epithelial ◽  
Lung Epithelial

Objective. We aimed to investigate how the embryonic stem cell-related gene Oct3/4 changes during the injury-repair process of distal pulmonary epithelium induced by 5-fluorouracil (5-Fu).Methods. We have developed the lung injury model induced by 5-Fu and observed the dynamic changes of Oct3/4 by indirect immunofluorescence, Western blot, and quantitative real-time PCR. Immunofluorescence double staining was used to compare the positions of Oct3/4(+) cells and other reported alveolar epithelial stem cells.Results. Oct3/4(+) cells were not found in normal rat lung epithelial cells. However, after treatment with 5-Fu, Oct3/4(+) cells appeared at 12 h, reached the peak at 24 h, then decreased at 48 h, and eventually disappeared at 72 h. Oct3/4 was localized in the nucleus. We found that the sites of Clara cell secretory protein and surfactant protein-C dual positive cells were apparently different from Oct3/4(+) cells.Conclusions. Our results revealed that, in rat alveolar epithelium, expression of Oct3/4 could be induced after treatment with 5-Fu, then decreased gradually, and was silenced following the alveolar epithelial differentiation. We hold that Oct3/4(+) cells are lung stem cells, which can provide new evidence for identification and isolation of lung epithelial stem cells.

scholarly journals Decreased expression of Met during differentiation in rat lung

2016 ◽  
Vol 60 (1) ◽  
Author(s):  
T. Kato ◽  
K. Oka ◽  
T. Nakamura ◽  
A. Ito
Keyword(s):  
Stem Cells ◽  
3D Culture ◽  
Immunofluorescence Assay ◽  
Lung Epithelial Cells ◽  
Alveolar Type ◽  
Cell Marker ◽  
Epithelial Stem Cells ◽  
Club Cell ◽  
Adult Mice ◽  
Lung Epithelial

<p>Organ-specific stem cells play key roles in maintaining the epithelial cell layers of lung. Bronchioalveolar stem cells (BASCs) are distal lung epithelial stem cells of adult mice. Alveolar type 2 (AT2) cells have important functions and serve as progenitor cells of alveolar type 1 (AT1) cells to repair the epithelium when they are injured. Hepatocyte growth factor (HGF) elicits mitogenic, morphogenic, and anti-apoptotic effects on lung epithelial cells through tyrosine phosphorylation of Met receptor, and thus is recognized as a pulmotrophic factor. To understand which cells HGF targets in lung, we identified the cells expressing Met by immunofluorescence assay. Met was strongly expressed in BASCs, which expressed an AT2 cell marker, pro-SP-C, and a club cell marker, CCSP. In alveoli, we found higher expression of Met in primary AT2 than in AT1 cells, which was confirmed using primary AT2 cells. We further examined the mitogenic activity of HGF in AT2-cell-derived alveolar-like cysts (ALCs) in 3D culture. Multicellular ALCs expressed Met, and HGF enhanced the ALC production. Taking these findings together, BASCs could also be an important target for HGF, and HGF-Met signaling could function more potent on cells that have greater multipotency in adult lung.</p>

Differentiation of Lung Epithelial Cells from Murine Embryonic Stem Cells with in Vivo Implantation

2013 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Christine Finck ◽  
Blair Roszell ◽  
Todd Jensen ◽  
Ariel Seaton ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Stem Cells ◽  
Embryonic Stem Cells ◽  
Epithelial Cells ◽  
Embryonic Stem ◽  
Lung Epithelial Cells ◽  
Murine Embryonic Stem Cells ◽  
Lung Epithelial

scholarly journals Lung epithelial stem cells express SARS-CoV-2 entry factors: implications for COVID-19

2020 ◽  
Author(s):  
Anna A. Valyaeva ◽  
Anastasia A. Zharikova ◽  
Artem S. Kasianov ◽  
Yegor S. Vassetzky ◽  
Eugene V. Sheval
Keyword(s):  
Stem Cells ◽  
Alveolar Epithelium ◽  
Cell Types ◽  
Regeneration Capacity ◽  
Rna Seq ◽  
Epithelial Stem Cells ◽  
Multipotent Stem Cells ◽  
High Death Rate ◽  
Lung Epithelial ◽  
High Death

AbstractSARS-CoV-2 can infiltrate the lower respiratory tract, resulting in severe respiratory failure and a high death rate. Normally, the airway and alveolar epithelium can be rapidly reconstituted by multipotent stem cells after episodes of infection. Here, we analyzed published RNA-seq datasets and demonstrated that cells of four different lung epithelial stem cell types express SARS-CoV-2 entry factors, including Ace2. Thus, stem cells can be potentially infected by SARS-CoV-2, which may lead to defects in regeneration capacity partially accounting for the severity of SARS-CoV-2 infection and its consequences.

scholarly journals Regulation of alveolar type 2 stem/progenitor cells in lung injury and regeneration

2020 ◽  
Vol 52 (7) ◽  
pp. 716-722 ◽  
Author(s):  
Ailing Wu ◽  
Hai Song
Keyword(s):  
Stem Cells ◽  
Lung Injury ◽  
Progenitor Cells ◽  
Alveolar Epithelium ◽  
Lung Epithelial Cells ◽  
Alveolar Type ◽  
Epithelial Stem Cells ◽  
Lung Structure ◽  
And Function

Abstract The renewal of lung epithelial cells is normally slow unless the lung is injured. The resident epithelial stem cells rapidly proliferate and differentiate to maintain lung structure and function when the lung is damaged. The alveolar epithelium is characterized by alveolar type 1 (AT1) and alveolar type 2 (AT2) cells. AT2 cells are the stem cells for alveoli, as they can both self-renew and generate AT1 cells. Abnormal proliferation and regulation of AT2 cells will lead to serious lung diseases including cancers. In this review, we focused on the alveolar stem/progenitor cells, the key physiological function of AT2 cells in lung homeostasis and the complicated regulation of AT2 cells in the repairing processes after lung injury.

scholarly journals Expression of SARS-CoV-2 entry factors in lung epithelial stem cells and its potential implications for COVID-19

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anna A. Valyaeva ◽  
Anastasia A. Zharikova ◽  
Artem S. Kasianov ◽  
Yegor S. Vassetzky ◽  
Eugene V. Sheval
Keyword(s):  
Stem Cells ◽  
Alveolar Epithelium ◽  
Cell Types ◽  
Regeneration Capacity ◽  
Rna Seq ◽  
Epithelial Stem Cells ◽  
Multipotent Stem Cells ◽  
High Death Rate ◽  
Lung Epithelial ◽  
High Death

Abstract SARS-CoV-2 can infiltrate the lower respiratory tract, resulting in severe respiratory failure and a high death rate. Normally, the airway and alveolar epithelium can be rapidly reconstituted by multipotent stem cells after episodes of infection. Here, we analyzed published RNA-seq datasets and demonstrated that cells of four different lung epithelial stem cell types express SARS-CoV-2 entry factors, including Ace2. Thus, stem cells can be potentially infected by SARS-CoV-2, which may lead to defects in regeneration capacity partially accounting for the severity of SARS-CoV-2 infection and its consequences.

scholarly journals Hair Follicle Dermal Cells Support Expansion of Murine and Human Embryonic and Induced Pluripotent Stem Cells and Promote Haematopoiesis in Mouse Cultures

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
Jun Liu ◽  
Claire A. Higgins ◽  
Jenna C. Whitehouse ◽  
Susan J. Harris ◽  
Heather Crawford ◽  
...  
Keyword(s):  
Stem Cells ◽  
Induced Pluripotent Stem Cells ◽  
Hair Follicle ◽  
Pluripotent Stem Cells ◽  
Embryonic Stem ◽  
Dermal Papilla ◽  
Epithelial Stem Cells ◽  
Stem Cell Maintenance ◽  
Induced Pluripotent ◽  
Dermal Cells

In the hair follicle, the dermal papilla (DP) and dermal sheath (DS) support and maintain proliferation and differentiation of the epithelial stem cells that produce the hair fibre. In view of their regulatory properties, in this study, we investigated the interaction between hair follicle dermal cells (DP and DS) and embryonic stem cells (ESCs); induced pluripotent stem cells (iPSCs); and haematopoietic stem cells. We found that coculture of follicular dermal cells with ESCs or iPSCs supported their prolonged maintenance in an apparently undifferentiated state as established by differentiation assays, immunocytochemistry, and RT-PCR for markers of undifferentiated ESCs. We further showed that cytokines that are involved in ESC support are also expressed by cultured follicle dermal cells, providing a possible explanation for maintenance of ES cell stemness in cocultures. The same cytokines were expressed within folliclesin situin a pattern more consistent with a role in follicle growth activities than stem cell maintenance. Finally, we show that cultured mouse follicle dermal cells provide good stromal support for haematopoiesis in an established coculture model. Human follicular dermal cells represent an accessible and readily propagated source of feeder cells for pluripotent and haematopoietic cells and have potential for use in clinical applications.

386 HORSE AMNION: A SOURCE OF MESENCHYMAL (AMSC) AND EPITHELIAL STEM CELLS

2010 ◽  
Vol 22 (1) ◽  
pp. 349 ◽  
Author(s):  
A. Lange Consiglio ◽  
B. Corradetti ◽  
D. Bizzaro ◽  
M. Cassano ◽  
F. Cremonesi
Keyword(s):  
Stem Cells ◽  
Epithelial Cells ◽  
Amniotic Membrane ◽  
Embryonic Stem ◽  
Specific Pattern ◽  
Limiting Factor ◽  
Epithelial Stem Cells ◽  
Culture Dish ◽  
Isolated Cells ◽  
Differentiation Potential

According to the developmental stage from which they are obtained, stem cells are classified as being embryonic, fetal, or adult. Embryonic stem cells have unlimited self-renewing capacity and multilineage differentiation potential, but the separation of these cells requires destruction of the embryo. Moreover, their clinical application seems to be hindered by the high tumorigenic rate after transplantation. Stem cells derived from adult tissues are considered to be more limited in their potential; although, they are currently the more versatile cells in the clinical field. However, the risk of the immunological rejection of the transplanted stem cells by the recipient is an important limiting factor. In human medicine, stem cells isolated from term placenta are the ideal candidates for disease treatment, specifically because of their plasticity and reduced immunogenicity. The aim of this work was to provide, for the first time, an isolation protocol and the characteristics of the stem cells from horse amniotic membrane, which hold potential uses in equine clinical regenerative medicine. Minimal criteria for stemness definition are adherence to plastic culture dish, formation of fibroblast colony forming units (CFU-F), specific pattern of surface antigen expression, and differentiation potential toward one or more lineages. The amnion is a thin, avascular membrane composed of an epithelial layer and an outer layer of connective tissue. From 3 samples of allantoamnion retrieved at delivery, each amniotic membrane was stripped from the overlying allantois and, for isolation of the epithelial cells, digested with trypsin. After removal of epithelial cells, the AMSC population was obtained by digestion with collagenase and DNase. The cellular yield from term amnion was 10-fold more epithelial cells than AMSC. Isolated cells readily attached to plastic culture dishes. Culture was established in DMEM-HG medium, supplemented with 10% serum and EGF, where the cells proliferated robustly. Epithelial cells displayed typical cuboidal morphology, whereas AMSC were fibroblast-like. Normally, 5 to 6 passages were achieved before proliferation decreased, with a mean of 13.08 and 26.5 cell population doublings after 31 days, respectively, for epithelial cells and AMSC. The mean frequency of CFU-F was, respectively, 1 : 283 and 1:111 for epithelial cells and AMSC. The 2 cellular lines expressed MSC mRNA markers (CD29, CD105, CD44) and were negative for CD34, which was expressed at the fifth passage in both cellular types. Osteogenic differentiation of epithelial stem cells and AMSC was confirmed by von Kossa stain and by an increased expression of osteocalcin and osteopontin. Our preliminary data showed that equine amnion holds apparent potential as a source of presumptive stem cells, which might have widespread clinical applications, but aspects including immunohistochemical study, preclinical experimentation, and immunological properties must be studied.

Dexamethasone stimulates transcription of the Na+-K+-ATPase β1gene in adult rat lung epithelial cells

2003 ◽  
Vol 285 (3) ◽  
pp. L593-L601 ◽  
Author(s):  
Hong Hao ◽  
Christine H. Wendt ◽  
Gurpreet Sandhu ◽  
David H. Ingbar
Keyword(s):  
Gene Expression ◽  
Epithelial Cells ◽  
Regulatory Elements ◽  
Lung Epithelial Cells ◽  
Mrna Levels ◽  
Rat Lung ◽  
Alveolar Epithelial ◽  
Adult Rat ◽  
Atpase Gene ◽  
Lung Epithelial

Na+-K+-ATPase plays an essential role in active alveolar epithelial fluid resorption. In fetal and adult alveolar epithelial cells, glucocorticoids (GC) increase Na+-K+-ATPase activity and mRNA levels. We sought to define the mechanism of Na+-K+-ATPase gene upregulation by GC. In a rat alveolar epithelial cell line (RLE), dexamethasone (Dex) increased β1-subunit Na+-K+-ATPase mRNA expression two- to threefold within 3 h after exposure to the GC. The increased gene expression was due to increased transcription as demonstrated by nuclear run-on assays, whereas mRNA stability remained unchanged. Transient transfection of 5′ deletion mutants of a β1promoter-reporter construct demonstrated a 1.5- to 2.2-fold increase in promoter activity by Dex. All of the 5′ deletion constructs contained partial or palindromic GC regulatory elements (GRE) and responded to GC. The increased expression of promoter reporter was inhibited by RU-486, a GC receptor (GR) antagonist, suggesting the involvement of GR. The palindromic GRE at -631 demonstrated Dex induction in a heterologous promoter construct. Gel mobility shift assays using RLE nuclear extracts demonstrated specific binding to this site and the presence of GR. We conclude that GC directly stimulate transcription of Na+-K+-ATPase β1gene expression in adult rat lung epithelial cells through a GR-dependent mechanism that can act at multiple sites.

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