Morphological changes and phagocytic activity during the interaction of human neutrophils with Sporothrix schenckii: An in vitro model

2019 ◽  
Vol 129 ◽  
pp. 56-63
Author(s):  
Vicente Curtiellas-Piñol ◽  
Javier Ventura-Juárez ◽  
Estela Ruiz-Baca ◽  
Yolanda Romo-Lozano
Keyword(s):  
Phagocytic Activity ◽  
In Vitro Model ◽  
Morphological Changes ◽  
Sporothrix Schenckii ◽  
Human Neutrophils ◽  
Vitro Model

scholarly journals Effect of Lignocaine Concentration on Human Fibroblasts Growth in Eyes Undergoing Trabeculectomy: An in vitro Study

2018 ◽  
Vol 3 (3) ◽  
pp. 1-10 ◽  
Author(s):  
Madhuravasal Krishnan Janani ◽  
Venkatakrishnan Jaichandran ◽  
Hajib Narahari Rao Madhavan ◽  
Lingam Vijaya ◽  
Ronnie Jacob George ◽  
...  
Keyword(s):  
Culture Medium ◽  
In Vitro Model ◽  
Morphological Changes ◽  
Human Fibroblasts ◽  
Annexin V ◽  
In Vitro Study ◽  
Tenon’S Capsule ◽  
Tenon's Capsule ◽  
Vitro Model

Purpose: To evaluate the effect of lignocaine on growth and apoptosis indication of primary human Tenon’s capsule fibroblast (HTFs) in an in vitro model. Patients and Methods: Tenon’s capsule tissue obtained from patients undergoing trabeculectomy were grown in cell culture medium. The effect of different concentrations of lignocaine (0.5, 1.0, 1.5, and 2%) on the morphology and growth of the fibroblasts was studied using microscopy, cell viability, and proliferation assay, and apoptosis was detected using the FITC Annexin V Apoptosis Kit. Results: Morphological changes similar to those of apoptotic cells, including cytoplasmic vacuolation, shrinkage, and rounding were visualized in the cells treated with concentrations greater than 1.0% (i.e., 1.5, 2.0%). Though proliferation inhibition was found with all four concentrations (0.5–2.0%), the viability of cells decreased from 1.0% lignocaine. Conclusion: 0.5% lignocaine prevents proliferation of fibroblasts without causing apoptosis in vitro.

Leukocyte antibacterial functions are not impaired by perfluorocarbon exposure in vitro

2008 ◽  
Vol 295 (1) ◽  
pp. L134-L142 ◽  
Author(s):  
Dirk Haufe ◽  
Eva Koenigshausen ◽  
Lilla Knels ◽  
Martina Wendel ◽  
Sebastian N. Stehr ◽  
...  
Keyword(s):  
Host Defense ◽  
In Vitro Model ◽  
Polymorphonuclear Neutrophils ◽  
Human Neutrophils ◽  
Intracellular Uptake ◽  
E Coli ◽  
Transmission Electron ◽  
Membrane Bound ◽  
Vitro Model

Application of liquid, aerosolized, and vaporized perfluorocarbons (PFC) in acute lung injury has shown anti-inflammatory effects. Although this may be beneficial in states of pulmonary hyperinflammation, it also could increase susceptibility to nosocomial lung infection. We hypothesized that PFC impair cellular host defense and therefore investigated in an in vitro model the influence of perfluorohexane (PFH) on crucial mechanisms of bacterial elimination in human neutrophils and monocytes. Using scanning and transmission electron microscopy, we could show membrane-bound and ingested PFH particles that morphologically did not alter adherence and phagocytosis of Escherichia coli or leukocyte viability. The amount of adherent and phagocytosed bacteria as determined by flow cytometry was not influenced in cells only pretreated with PFH for 1 and 4 h. When PFH was present during E. coli challenge, bacterial adherence was decreased in polymorphonuclear neutrophils, but respective intracellular uptake was not impaired and was even significantly promoted in monocytes. Overall, E. coli-induced respiratory burst capacity was not reduced by PFH. Our findings provide evidence that key functions of innate host defense are not compromised by PFH treatment in vitro.

scholarly journals Epithelial permeability and the transepithelial migration of human neutrophils.

1983 ◽  
Vol 96 (5) ◽  
pp. 1241-1247 ◽  
Author(s):  
L C Milks ◽  
M J Brontoli ◽  
E B Cramer
Keyword(s):  
In Vitro Model ◽  
The Body ◽  
Human Neutrophils ◽  
Epithelial Permeability ◽  
Cell Contacts ◽  
Epithelial Monolayers ◽  
Tissue Factors ◽  
Vitro Model ◽  
Close Contacts

Although polymorphonuclear leukocytes (PMN's) can migrate through every epithelium in the body regardless of its permeability, very little is known about the effect of epithelial permeability on PMN migration and the effect of emigrating PMN's on the permeability of the epithelium. In an in vitro model system of transepithelial migration, human PMN's were stimulated by 0.1 micrometer fMet-Leu-Phe to traverse confluent, polarized canine kidney epithelial monolayers of varying permeabilities. Epithelial permeability was determined by both conductance measurement and horseradish peroxidase (HRP) tracer studies. As epithelial permeability increased, the number of PMN invasion sites as well as the number of PMN's that traversed the monolayer increased. The effect of PMN migration on epithelial permeability was examined using the ultrastructural tracers HRP and lanthanum nitrate. PMN's traversing the monolayer made close cell-to-cell contacts with other invading PMNs and with adjacent epithelial cells. These close contacts appeared to prevent leakage of tracer across invasion sites. Following PMN emigration, epithelial junctional membranes reapproximated and were impermeable to the tracers. These results indicated that, in the absence of serum and connective tissue factors, (a) the number of PMN invasion sites and the number of PMN's that traversed an epithelium were a function of the conductance of the epithelium and (b) PMN's in the process of transepithelial migration maintained close cell-cell contacts and prevented the leakage of particles (greater than 5 nm in diameter) across the invasion site.

scholarly journals Features of the functional activity of macrophage link of immunity with gastroesophageal reflux disease depending on the type of reluctate: in vitro model

2018 ◽  
Vol 90 (2) ◽  
pp. 19-23 ◽  
Author(s):  
S V Lyamina ◽  
I V Maev ◽  
S V Kalish ◽  
D N Andreev ◽  
O V Kladovikova ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Gastroesophageal Reflux Disease ◽  
Gastroesophageal Reflux ◽  
Reflux Disease ◽  
Functional Activity ◽  
Phagocytic Activity ◽  
In Vitro Model ◽  
Cytokine Profile ◽  
Vitro Model

Aim. A generalized analysis of changes in functional activity of macrophages on the basis of phagocytic activity, cytokine profile, changes in the level of expression of surface markers characteristic of pro - or anti-inflammatory phenotype of the cells when exposed to reluctate. Materials and methods. Developed in vitro model of co-peritoneal macrophages of mice With57/BL6 (n=65) and reluctate patients with gastroesophageal reflux disease (GERD; n=65) having different pH values (three group comparison). Took into account the standard criteria phagocytic ability (absorption Staphylococcus aureus 9198, light microscopy), secretory activity (cytokine profile Th1/Th2, flow cytometry) and receptor characterization of macrophages (expression of CD25/80/163/206, flow cytometry). Results. The phagocytic activity of macrophages, calculated on the basis of the average number of bacteria ingested by one phagocyte, is not associated with the pH value of the added reluctate. It is established that the alkalinisation of reluctate leads to significant alteration in the expression of CD receptors - decrease M1 and increase M2. The index of total production of Th1/Тһ2 in groups progressively decreased with increasing pH of reluctate and amounted to 3.6 units in the group pH from 4.6 to 6.6; 2.8 units group a pH of 6.7-7.2 and 1.6 units in the group pH of 7.3 to 8.1, due to increased production of Th2 cytokines at offset reluctate pH to slightly alkaline side. The data obtained indicate the increase of expression and secretion of anti-inflammatory markers at an alkaline pH shift of reluctate. Analysis of the studied characteristics of the activity profile of macrophages in the proposed in vitro model justifies the need for considering the peculiarities of the functional activity of macrophages under the influence of reluctate different nature. The special importance of studying the cytokine profile and characteristics of the functional activity of macrophages in patients with GERD, given the nature of reluctate.

An in vitro model for investigation of vitamin A effects on wound healing

2021 ◽  
pp. 1-6
Author(s):  
Hoda Keshmiri Neghab ◽  
Mohammad Hasan Soheilifar ◽  
Gholamreza Esmaeeli Djavid
Keyword(s):  
Wound Healing ◽  
Endothelial Cell ◽  
Vitamin A ◽  
In Vitro Model ◽  
Cellular Proliferation ◽  
Endothelial Cell Migration ◽  
Normal Fibroblast ◽  
Anti Inflammatory ◽  
Vitro Model

Abstract. Wound healing consists of a series of highly orderly overlapping processes characterized by hemostasis, inflammation, proliferation, and remodeling. Prolongation or interruption in each phase can lead to delayed wound healing or a non-healing chronic wound. Vitamin A is a crucial nutrient that is most beneficial for the health of the skin. The present study was undertaken to determine the effect of vitamin A on regeneration, angiogenesis, and inflammation characteristics in an in vitro model system during wound healing. For this purpose, mouse skin normal fibroblast (L929), human umbilical vein endothelial cell (HUVEC), and monocyte/macrophage-like cell line (RAW 264.7) were considered to evaluate proliferation, angiogenesis, and anti-inflammatory responses, respectively. Vitamin A (0.1–5 μM) increased cellular proliferation of L929 and HUVEC (p < 0.05). Similarly, it stimulated angiogenesis by promoting endothelial cell migration up to approximately 4 fold and interestingly tube formation up to 8.5 fold (p < 0.01). Furthermore, vitamin A treatment was shown to decrease the level of nitric oxide production in a dose-dependent effect (p < 0.05), exhibiting the anti-inflammatory property of vitamin A in accelerating wound healing. These results may reveal the therapeutic potential of vitamin A in diabetic wound healing by stimulating regeneration, angiogenesis, and anti-inflammation responses.

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