What cytokines are produced by endothelial cells?
The broad spectrum of pro-inflammatory cytokines and chemokines expressed by ECs includes IL-1β, IL-3, IL-5, IL-6, IL-8, IL-11, IL-15, growth-regulated oncogene α (GRO-α, CXCL1), MCP-1(CCL2), RANTES(CCL5) , and TNF-α [90, 91].
Which cytokine increases permeability?
IL-33 increased the permeability of HUVEC, as demonstrated in a [14C] sucrose permeability assay in vitro and the Miles vascular permeability assay in vivo. This increase in permeability coincided with a reduction in the localization of VE-cadherin to the cell-cell junction (94).
Do endothelial cells produce IFN?
8. IFN-γ production is co-stimulated by human brain endothelial cells, potentially via MHCII, ICOSL, IL-2 and B7-1/B7-2. Having shown that NK cells were partly responsible for the increase of IFN-γ protein in the tripartite culture, we next explored the possible involvement of several molecules in this system.
Do endothelial cells produce cytokines?
Endothelial cells have been shown to produce various cytokines and chemokines during inflammatory processes and may be a source of cytokines and chemokines in the lung during influenza virus infection.
Can anything pass through tight junctions?
Tight junctions perform two vital functions: They limit the passage of molecules and ions through the space between cells. So most materials must actually enter the cells (by diffusion or active transport) in order to pass through the tissue.
Does cytokine storm occur in sepsis?
This cytokine storm, an important part of sepsis, can be triggered when we face an infection from a bacteria, virus, parasite or fungus. In typical years, bacteria are the most common cause of sepsis.
Do endothelial cells secrete chemokines?
Second, chemokines can be secreted by endothelial cells. The secretion of chemokines by endothelial cells has been shown to be promoted by several different stimuli relevant to cardiovascular disease.
How is the function of occludin investigated?
The function of occludin was initially investigated by introducing chick occludin cDNA into MDCK cells in a Lac inducible vector [15]. Occludin expression was induced by the addition of isopropyl-β- d -thiogalactoside (IPTG) to the medium.
How is occludin expression related to cell adhesion?
An adhesion assay was used to show that occludin expression induced adhesion in the absence of calcium in NRK and Rat-1 fibroblasts, hence demonstrating that the process was independent of cadherin–cadherin contacts. Conversely, L-cells exhibited no cell–cell adhesion as a result of induced occludin expression.
How many extracellular loops are there in occludin?
The amino acid sequence predicted four putative membrane-spanning segments, two 44-amino acid extracellular loops and two intracellular domains. Furuse et al. [6] established that the amino acid sequence of the first extracellular loop is highly concentrated with tyrosine and glycine residues (∼60%).
What is the role of phosphorylation in occludin regulation?
Phosphorylation/dephosphorylation plays a major role in regulation of occludin and TJ. Disruption of occludin regulation is an important aspect of a number of diseases. Strategies to prevent and/or reverse occludin downregulation may be an important therapeutic target.
