Effects of ozone and particulate matter on airway epithelial barrier structure and function: a review of in vitro and in vivo studies

Background: Alcohol abuse is common in people living with HIV-1 and dramaticallyenhances the severity of HIV-induced liver damage by inducing oxidative stress and lysosomaldysfunction in the liver cells. We hypothesize that the increased release of extracellular vesicles(EVs) in hepatocytes and liver humanized mouse model is linked to lysosome dysfunction. Methods:The study was performed on primary human hepatocytes and human hepatoma RLWXP-GFP (Huh7.5 cells stably transfected with CYP2E1 and XPack-GFP) cells and validated on ethanol-fed liverhumanizedfumarylacetoacetate hydrolase (Fah)-/-, Rag2-/-, common cytokine receptor gamma chainknockout (FRG-KO) mice. Cells and mice were infected with HIV-1ADA virus. Results: We observedan increase in the secretion of EVs associated with a decrease in lysosomal activity and expressionof lysosomal-associated membrane protein 1. Next-generation RNA sequencing of primary humanhepatocytes revealed 63 differentially expressed genes, with 13 downregulated and 50 upregulatedgenes in the alcohol–HIV-treated group. Upstream regulator analysis of differentially expressedgenes through Ingenuity Pathway Analysis identified transcriptional regulators affecting downstreamgenes associated with increased oxidative stress, lysosomal associated disease, and function andEVs biogenesis. Our in vitro findings were corroborated by in vivo studies on human hepatocytetransplantedhumanized mice, indicating that intensive EVs’ generation by human hepatocytes andtheir secretion to serum was associated with increased oxidative stress and reduction in lysosomalactivities triggered by HIV infection and ethanol diet. Conclusion: HIV-and-ethanol-metabolisminducedEVs release is tightly controlled by lysosome status in hepatocytes and participates in thedevelopment of double-insult-induced liver injury.

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Multiplatform Physiologic and Metabolic Phenotyping Reveals Microbial Toxicity

mSystems ◽

10.1128/msystems.00123-18 ◽

2018 ◽

Vol 3 (6) ◽

Cited By ~ 2

Author(s):

Jingwei Cai ◽

Robert G. Nichols ◽

Imhoi Koo ◽

Zachary A. Kalikow ◽

Limin Zhang ◽

...

Keyword(s):

Mass Spectrometry ◽

Amino Acids ◽

Flow Cytometry ◽

Free Radical ◽

Gut Microbiota ◽

Structure And Function ◽

Metabolic Phenotyping ◽

And Function

ABSTRACTThe gut microbiota is susceptible to modulation by environmental stimuli and therefore can serve as a biological sensor. Recent evidence suggests that xenobiotics can disrupt the interaction between the microbiota and host. Here, we describe an approach that combinesin vitromicrobial incubation (isolated cecal contents from mice), flow cytometry, and mass spectrometry- and1H nuclear magnetic resonance (NMR)-based metabolomics to evaluate xenobiotic-induced microbial toxicity. Tempol, a stabilized free radical scavenger known to remodel the microbial community structure and functionin vivo, was studied to assess its direct effect on the gut microbiota. The microbiota was isolated from mouse cecum and was exposed to tempol for 4 h under strict anaerobic conditions. The flow cytometry data suggested that short-term tempol exposure to the microbiota is associated with disrupted membrane physiology as well as compromised metabolic activity. Mass spectrometry and NMR metabolomics revealed that tempol exposure significantly disrupted microbial metabolic activity, specifically indicated by changes in short-chain fatty acids, branched-chain amino acids, amino acids, nucleotides, glucose, and oligosaccharides. In addition, a mouse study with tempol (5 days gavage) showed similar microbial physiologic and metabolic changes, indicating that thein vitroapproach reflectedin vivoconditions. Our results, through evaluation of microbial viability, physiology, and metabolism and a comparison ofin vitroandin vivoexposures with tempol, suggest that physiologic and metabolic phenotyping can provide unique insight into gut microbiota toxicity.IMPORTANCEThe gut microbiota is modulated physiologically, compositionally, and metabolically by xenobiotics, potentially causing metabolic consequences to the host. We recently reported that tempol, a stabilized free radical nitroxide, can exert beneficial effects on the host through modulation of the microbiome community structure and function. Here, we investigated a multiplatform phenotyping approach that combines high-throughput global metabolomics with flow cytometry to evaluate the direct effect of tempol on the microbiota. This approach may be useful in deciphering how other xenobiotics directly influence the microbiota.

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How Harmful Is Particulate Matter Emitted from Biomass Burning? A Thailand Perspective

Current Pollution Reports ◽

10.1007/s40726-019-00125-4 ◽

2019 ◽

Vol 5 (4) ◽

pp. 353-377 ◽

Cited By ~ 13

Author(s):

Helinor J. Johnston ◽

William Mueller ◽

Susanne Steinle ◽

Sotiris Vardoulakis ◽

Kraichat Tantrakarnapa ◽

...

Keyword(s):

Particulate Matter ◽

Health Effects ◽

Biomass Burning ◽

Large Body ◽

Experimental Studies ◽

In Vivo Studies ◽

Indoor And Outdoor Environments ◽

Epidemiology Studies

Abstract Purpose of Review A large body of epidemiological evidence demonstrates that exposure to particulate matter (PM) is associated with increased morbidity and mortality. Many epidemiology studies have investigated the health effects of PM in Europe and North America and focussed on traffic derived PM. However, elevated levels of PM are a global problem and the impacts of other sources of PM on health should be assessed. Biomass burning can increase PM levels in urban and rural indoor and outdoor environments in developed and developing countries. We aim to identify whether the health effects of traffic and biomass burning derived PM are similar by performing a narrative literature review. We focus on Thailand as haze episodes from agricultural biomass burning can substantially increase PM levels. Recent Findings Existing epidemiology, in vitro and in vivo studies suggest that biomass burning derived PM elicits toxicity via stimulation of oxidative stress, inflammation and genotoxicity. Thus, it is likely to cause similar adverse health outcomes to traffic PM, which causes toxicity via similar mechanisms. However, there is conflicting evidence regarding whether traffic or biomass burning derived PM is most hazardous. Also, there is evidence that PM released from different biomass sources varies in its toxic potency. Summary We recommend that epidemiology studies are performed in Thailand to better understand the impacts of PM emitted from specific biomass sources (e.g. agricultural burning). Further, experimental studies should assess the toxicity of PM emitted from more diverse biomass sources. This will fill knowledge gaps and inform evidence-based interventions that protect human health.

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Effect of lycorine on the structure and function of hepatoma cell membrane in vitro and in vivo

Biotechnology & Biotechnological Equipment ◽

10.1080/13102818.2020.1719019 ◽

2020 ◽

Vol 34 (1) ◽

pp. 104-114 ◽

Cited By ~ 1

Author(s):

Guosong Xin ◽

Miao Yu ◽

Yang Hu ◽

Shiyong Gao ◽

Zheng Qi ◽

...

Keyword(s):

Cell Membrane ◽

Hepatoma Cell ◽

Structure And Function ◽

And Function

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Nanoparticles at the neurovascular unit: In vitro and in vivo studies to assess the blood-brain barrier permeability and function

Vascular Pharmacology ◽

10.1016/j.vph.2017.12.023 ◽

2018 ◽

Vol 103-105 ◽

pp. 55-56

Author(s):

G. Forcaia ◽

R. Dal Magro ◽

B. Albertini ◽

P. Blasi ◽

F. Re ◽

...

Keyword(s):

Blood Brain Barrier ◽

Neurovascular Unit ◽

Brain Barrier ◽

In Vivo Studies ◽

Barrier Permeability ◽

Blood Brain Barrier Permeability ◽

Brain Barrier Permeability ◽

And Function

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IL-4 and SDF-1 Increase Adipose Tissue-Derived Stromal Cell Ability to Improve Rat Skeletal Muscle Regeneration

International Journal of Molecular Sciences ◽

10.3390/ijms21093302 ◽

2020 ◽

Vol 21 (9) ◽

pp. 3302

Author(s):

Małgorzata Zimowska ◽

Karolina Archacka ◽

Edyta Brzoska ◽

Joanna Bem ◽

Areta M. Czerwinska ◽

...

Keyword(s):

Skeletal Muscle ◽

Adipose Tissue ◽

Muscle Regeneration ◽

Structure And Function ◽

Skeletal Muscle Regeneration ◽

Stem Cell Markers ◽

Myogenic Factors ◽

And Function

Skeletal muscle regeneration depends on the satellite cells, which, in response to injury, activate, proliferate, and reconstruct damaged tissue. However, under certain conditions, such as large injuries or myopathies, these cells might not sufficiently support repair. Thus, other cell populations, among them adipose tissue-derived stromal cells (ADSCs), are tested as a tool to improve regeneration. Importantly, the pro-regenerative action of such cells could be improved by various factors. In the current study, we tested whether IL-4 and SDF-1 could improve the ability of ADSCs to support the regeneration of rat skeletal muscles. We compared their effect at properly regenerating fast-twitch EDL and poorly regenerating slow-twitch soleus. To this end, ADSCs subjected to IL-4 and SDF-1 were analyzed in vitro and also in vivo after their transplantation into injured muscles. We tested their proliferation rate, migration, expression of stem cell markers and myogenic factors, their ability to fuse with myoblasts, as well as their impact on the mass, structure and function of regenerating muscles. As a result, we showed that cytokine-pretreated ADSCs had a beneficial effect in the regeneration process. Their presence resulted in improved muscle structure and function, as well as decreased fibrosis development and a modulated immune response.

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Protective Effects of Antimuscarinics on the Bladder Remodeling After Bladder Outlet Obstruction

Cellular Physiology and Biochemistry ◽

10.1159/000485358 ◽

2017 ◽

Vol 44 (3) ◽

pp. 907-919 ◽

Cited By ~ 7

Author(s):

Qiang Liu ◽

Deyi Luo ◽

Tongxin Yang ◽

Banghua Liao ◽

Hong Li ◽

...

Keyword(s):

Smooth Muscle ◽

Bladder Outlet Obstruction ◽

Outlet Obstruction ◽

Structure And Function ◽

Bladder Function ◽

Bladder Smooth Muscle ◽

M3 Receptors ◽

And Function

Background/Aims: Overactive bladder associated with bladder outlet obstruction (BOO) is a highly prevalent condition, which is usually treated with antimuscarinics. However, the potential effects of antimuscarinics on the structure and function of bladder have not been investigated thus far. Methods: Sprague-Dawley(R) rats accepted bladder neck obstruction surgery or sham surgery, and then received treatment of three different antimuscarinics (Solifenacin, Darifenacin, and Tolterodine) or vehicle. After 3, 6 and 12 weeks, the bladder function and structure were measured. The effect of antimuscarinics on cellular alteration in vitro was observed under mechanical stimulation. Bladder morphology were examined by immunohistochemistry, and the bladder function were investigated by cystometry and strip contractility test. The expression of muscarinic receptors and inflammatory cytokines were measured by PCR and Western blotting. Results: Here we demonstrate, both in vitro and in vivo, that antimuscarinics are protective regulators for the bladder structure and function. Antimuscarinics decrease the weight of bladders with BOO. Antimuscarinics improve the voiding parameter and enhance the contraction of bladder smooth muscle. The results also show that antimuscarinics inhibit the proliferation of bladder smooth muscle cells both in vivo and in vitro, it can reduce the collagen deposition and inflammatory cytokines in bladders with BOO. During this process, the expression of M2 and M3 receptors was altered by antimuscarinics. Conclusion: Antimuscarinics could reverse the structural and functional changes of BOO bladder wall at cellular and tissue level, and the alteration of M2 and M3 receptors may be involved in this biological process.

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The role of secreted Hsp90α in HDM-induced asthmatic airway epithelial barrier dysfunction

BMC Pulmonary Medicine ◽

10.1186/s12890-019-0938-z ◽

2019 ◽

Vol 19 (1) ◽

Cited By ~ 1

Author(s):

Cuiping Ye ◽

Chaowen Huang ◽

Mengchen Zou ◽

Yahui Hu ◽

Lishan Luo ◽

...

Keyword(s):

Barrier Function ◽

Epithelial Barrier ◽

Airway Epithelial ◽

Barrier Dysfunction ◽

Epithelial Barrier Function ◽

Asthmatic Airway ◽

Epithelial Barrier Dysfunction

Abstract Background The dysfunction of airway epithelial barrier is closely related to the pathogenesis of asthma. Secreted Hsp90α participates in inflammation and Hsp90 inhibitor protects endothelial dysfunction. In the current study, we aimed to explore the role of secreted Hsp90α in asthmatic airway epithelial barrier function. Methods Male BALB/c mice were sensitized and challenged with HDM to generate asthma model. The 16HBE and Hsp90α-knockdown cells were cultured and treated according to the experiment requirements. Transepithelial Electric Resistance (TEER) and permeability of epithelial layer in vitro, distribution and expression of junction proteins both in vivo and in vitro were used to evaluate the epithelial barrier function. Western Blot was used to evaluate the expression of junction proteins and phosphorylated AKT in cells and lung tissues while ELISA were used to evaluate the Hsp90α expression and cytokines release in the lung homogenate. Results HDM resulted in a dysfunction of airway epithelial barrier both in vivo and in vitro, paralleled with the increased expression and release of Hsp90α. All of which were rescued in Hsp90α-knockdown cells or co-administration of 1G6-D7. Furthermore, either 1G6-D7 or PI3K inhibitor LY294002 suppressed the significant phosphorylation of AKT, which caused by secreted and recombinant Hsp90α, resulting in the restoration of epithelial barrier function. Conclusions Secreted Hsp90α medicates HDM-induced asthmatic airway epithelial barrier dysfunction via PI3K/AKT pathway, indicating that anti-secreted Hsp90α therapy might be a potential treatment to asthma in future.

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