Physiochemical Environment Research Articles

Impact of smoking on oral mucosa: A cytological and cellular proliferation study.

Cigarette smoking is known to induce various cellular changes and proliferative activities within the oral mucosa. This study compares the effects of smoking on cellular proliferation and cytological alterations using the AgNORs and Pap staining methods. We performed statistical analyses to evaluate the mean AgNORs count in smokers and non- smokers. Additionally, we assessed the presence of reactive cellular changes in smokers using the Pap staining method. Cytological alterations, including inflammatory changes, were documented in both groups, and we focused on the prevalence of such changes in smokers. The mean AgNORs count was found to be 3.68 in smokers, which is consistent with marked reactive cellular changes. Inflammatory changes and reactive cellular changes, observed in 33.3 % and 59.3 % of cases, respectively, were significantly more prevalent in smokers. These findings suggest that smoking induces epithelial alterations, even in the absence of clinical symptoms, due to the physiochemical environment created by the elements in tobacco. This study also supports previous research indicating that cigarette smoking modifies cell growth control processes and increases cell proliferation in the oral mucosa. Cigarette smoking significantly elevates cellular proliferation, as indicated by the increased AgNORs counts in smokers. The combined use of Pap staining and AgNORs counting proved effective at detecting cellular proliferation before clinical symptoms appeared in smokers. Additional research is recommended to assess the impact of factors such as age, sex, and daily cigarette consumption on different oral regions. Comparative studies involving other proliferation indicators, such as Ki-67 or molecular testing, are also advised.

1.Y.2. Children’s mental health problems explode. Can exposome research offer a solution?

Abstract Background A week-long, multidisciplinary workshop at the Lorentz Institute explored the expectations of exposome research on child health. Exposome research investigates how combined exposures affect health. Currently we see an increase in adolescent mental health problems in Europe. We explore at the workshop if and how exposome research can be part of the solution to tackle this health issue. Findings The workshop aims were to analyze how monitoring data from exposome research can be best used for improving health policy in relation to improving (environmental) health policy in relation to children’s health. By taking a deep dive into solution-finding, we explored creative solutions to better utilize existing exposome data from digital data platforms, such as cohort data. And to facilitate working across disciplines using innovative tools of working transdisciplinary across research, policymakers and other professionals. Furthermore, we study how to enhance, harmonize and interpretation of data on child health. Furthermore, we look how child health depends not only on the quality of a healthcare system, but also on the magnitude of negative or positive influencing factors, such as social and environmental factors. Identifying such stressors and reducing their impact through adequate policies can improve child health on local, national, or even global scales. One innovative way of identifying such stressors is the exposome approach. The exposome approach is the characterization of the non-genetic drivers of health and disease. The exposome comprises aspects of the Built environment (characteristics of where we live); the Social environment (with whom we interact, social networks and income); the Physio-Chemical environment (chemical and environmental factors exposure) and the Lifestyle/Food environment (what we eat, how much we exercise) over the entire life-course. Workshop aims: - Provide a background on the urgency of adolescent mental health problems in Europe. - Compare approaches of stakeholders and researchers: stakeholders’ input from the practical field can shape the approach of the research process. The second benefit is to derive implications for creating effective interventions and policies to prevent adverse effects of environmental exposures and to foster positive health in children and later in life. - Explore existing interventions on child health for issues, experiences and possible solutions to the governance and organization of health adaptation in urban and social planning. - How to act in the process of research to intervention to public policies. The workshop consists of three short presentations followed by interactive panel discussions. We end with the audience actively engaging in the debate, as well as entering their questions. The workshop will end by identifying the current and future necessary roles, responsibilities, capacities of the public health researchers, policymakers, and professionals for child health protection in complicated exposure settings. Key messages • Child mental health issues are increasing in an unexplainable way. • Engaging stakeholders into an exposome research process can help to form a child health strategy in Europe.

Termite Microbial Symbiosis as a Model for Innovative Design of Lignocellulosic Future Biorefinery: Current Paradigms and Future Perspectives

The hunt for renewable and alternative fuels has driven research towards the biological conversion of lignocellulosic biomass (LCB) into biofuels, including bioethanol and biohydrogen. Among the natural biomass utilization systems (NBUS), termites represent a unique and easy-to-access model system to study host–microbe interactions towards lignocellulose bioconversion/valorization. Termites have gained significant interest due to their highly efficient lignocellulolytic systems. The wood-feeding termites apply a unique and stepwise process for the hydrolysis of lignin, hemicellulose, and cellulose via biocatalytic processes; therefore, mimicking their digestive metabolism and physiochemical gut environments might lay the foundation for an innovative design of nature-inspired biotechnology. This review highlights the gut system of termites, particularly the wood-feeding species, as a unique model for future biorefinery. The gut system of termites is a treasure-trove for prospecting novel microbial species, including protists, bacteria, and fungi, having higher biocatalytic efficiencies and biotechnological potentials. The significance of potential bacteria and fungi for harnessing the enzymes appropriate for lignocellulosic biorefinery is also discussed. Termite digestomes are rich sources of lignocellulases and related enzymes that could be utilized in various industrial processes and biomass-related applications. Consideration of the host and symbiont as a single functioning unit will be one of the most crucial strategies to expedite developments in termite-modeled biotechnology in the future.

Effects of highly effective modulator therapy on the dynamics of the respiratory mucosal environment and inflammatory response in cystic fibrosis.

While the widespread initiation of elexacaftor/tezacaftor/ivacaftor (ETI) has led to dramatic clinical improvements among persons with cystic fibrosis (pwCF), little is known about how ETI affects the respiratory mucosal inflammatory and physiochemical environment, or how these changes relate to lung function. We performed a prospective, longitudinal study of adults with CF and chronic rhinosinusitis (CF-CRS) followed at our CF center (n = 18). Endoscopic upper respiratory tract (paranasal sinus) aspirates from multiple visit dates, both pre- and post-ETI initiation, were collected and tested for cytokines, metals, pH, and lactate levels. Generalized estimating equations were used to identify relationships between ETI and upper respiratory tract (URT) biomarker levels, and between URT biomarkers and lung function or clinical sinus parameters. ETI was associated with decreased upper respiratory mucosal cytokines B-cell activating factor (BAFF), IL-12p40, IL-32, IL-8, IL-22 and soluble tumor necrosis factor-1 (sTNFR1), and an increase in a proliferation-inducing ligand (APRIL) and IL-19. ETI was also associated with decreased URT levels of copper, manganese, and zinc. In turn, lower URT levels of BAFF, IL-8, lactate, and potassium were each associated with ~1.5% to 4.3% improved forced expiratory volume in 1 s (FEV1), while higher levels of IFNγ, iron, and selenium were associated with ~2% to 10% higher FEV1. Our observations suggest a dampening of inflammatory signals and restriction in microbial nutrients in the upper respiratory tract with ETI. These findings improve our understanding of how ETI impacts the mucosal environment in the respiratory tract, and may give insight into the improved infectious and inflammatory status and the resulting clinical improvements seen in pwCF.

A continuous flow bioreactor system for high-throughput hyperpolarized metabolic flux analysis.

Hyperpolarized carbon-13 labeled compounds are increasingly being used in medical MR imaging (MRI) and MR imaging (MRI) and spectroscopy (MRS) research, due to its ability to monitor tissue and cell metabolism in real-time. Although radiological biomarkers are increasingly being considered as clinical indicators, biopsies are still considered the gold standard for a large variety of indications. Bioreactor systems can play an important role in biopsy examinations because of their ability to provide a physiochemical environment that is conducive for therapeutic response monitoring ex vivo. We demonstrate here a proof-of-concept bioreactor and microcoil receive array setup that allows for ex vivo preservation and metabolic NMR spectroscopy on up to three biopsy samples simultaneously, creating an easy-to-use and robust way to simultaneously run multisample carbon-13 hyperpolarization experiments. Experiments using hyperpolarized [1-13C]pyruvate on ML-1 leukemic cells in the bioreactor setup were performed and the kinetic pyruvate-to-lactate rate constants ( ) extracted. The coefficient of variation of the experimentally found s for five repeated experiments was . With this statistical power, treatment effects of 30%-40% change in lactate production could be easily differentiable with only a few hyperpolarization dissolutions on this setup. Furthermore, longitudinal experiments showed preservation of ML-1 cells in the bioreactor setup for at least 6 h. Rat brain tissue slices were also seen to be preserved within the bioreactor for at least 1 h. This validation serves as the basis for further optimization and upscaling of the setup, which undoubtedly has huge potential in high-throughput studies with various biomarkers and tissue types.

Alterations in litter chemical traits and soil environmental properties limit the litter decomposition of near-mature Robinia pseudoacacia plantations

Increases in stand age can significantly change litter and soil microenvironmental properties of plantations. However, how these factors change and by which pathways they act together to affect litter decomposition are not well understood. In this study, litters were collected from four Robinia pseudoacacia (Rp) plantations from a 10 ∼ 43-year sequence in the Loess Plateau (China) and used to conduct a 592-day in-situ decomposition experiment using litterbag method. The changes in litter chemical traits, soil physiochemical environment, and the litter and soil microbial community were detected. Then, the pathways of these changes affecting litter decomposition were analyzed based on partial least squares structural equation modeling. The results indicated that with increasing stand age, the increased litter substrate quality stimulated litter lignocellulase activity by affecting the fungal community structure in early and late stages of decomposition and the bacterial community structure in early decomposition, which tended to accelerate litter decomposition. However, the decrease in litter chemical diversity weakened the synergistic effects of mixed litter decomposition, and thus directly hindered the overall decomposition. On the other hand, increasing stand age caused excessive soil temperature and low soil moisture in early decomposition stage, which indirectly affected the litter microbial communities through changes in the soil fungal community, leading to decreases in litter lignocellulase activity and litter decomposition. Overall, changes in litter chemical traits with increasing stand age tended to cause dual effects, while those in the soil microenvironment tended to cause increasing negative effects. Together these changes finally affected litter decomposition by litter microbes and their enzymatic activities, leading to depressed litter decomposition and a risk of weakening material cycling in near-mature (33-year) Rp plantations.

Mechanosensitive ion channels MSL8, MSL9, and MSL10 have environmentally sensitive intrinsically disordered regions with distinct biophysical characteristics in vitro.

Intrinsically disordered protein regions (IDRs) are highly dynamic sequences that rapidly sample a collection of conformations over time. In the past several decades, IDRs have emerged as a major component of many proteomes, comprising ~30% of all eukaryotic protein sequences. Proteins with IDRs function in a wide range of biological pathways and are notably enriched in signaling cascades that respond to environmental stresses. Here, we identify and characterize intrinsic disorder in the soluble cytoplasmic N-terminal domains of MSL8, MSL9, and MSL10, three members of the MscS-like (MSL) family of mechanosensitive ion channels. In plants, MSL channels are proposed to mediate cell and organelle osmotic homeostasis. Bioinformatic tools unanimously predicted that the cytosolic N-termini of MSL channels are intrinsically disordered. We examined the N-terminus of MSL10 (MSL10N) as an exemplar of these IDRs and circular dichroism spectroscopy confirms its disorder. MSL10N adopted a predominately helical structure when exposed to the helix-inducing compound trifluoroethanol (TFE). Furthermore, in the presence of molecular crowding agents, MSL10N underwent structural changes and exhibited alterations to its homotypic interaction favorability. Lastly, interrogations of collective behavior via in vitro imaging of condensates indicated that MSL8N, MSL9N, and MSL10N have sharply differing propensities for self-assembly into condensates, both inherently and in response to salt, temperature, and molecular crowding. Taken together, these data establish the N-termini of MSL channels as intrinsically disordered regions with distinct biophysical properties and the potential to respond uniquely to changes in their physiochemical environment.

Biological Activities of p-Hydroxycinnamic Acids in Maintaining Gut Barrier Integrity and Function.

It is well established that p-Hydroxycinnamic acids (HCAs), including ferulic, caffeic, sinapic, and p-coumaric acids, possess a characteristic phenylpropanoid C6-C3 backbone and account for about one-third of the phenolic compounds in our diet. HCAs are typically associated with various plant cell wall components, including mono-, di-, and polysaccharides, sterols, polyamines, glycoproteins, and lignins. Interestingly, enzymes produced by intestinal microbes liberate HCAs from these associations. HCAs are completely absorbed in their free form upon ingestion and undergo specific reactions upon absorption in the small intestine or liver. The gut epithelium, composed of intestinal epithelial cells (IECs), acts as a physical barrier against harmful bacteria and a site for regulated interactions between bacteria and the gut lumen. Thus, maintaining the integrity of the epithelial barrier is essential for establishing a physiochemical environment conducive to homeostasis. This review summarizes the protective effects of HCAs on the intestinal barrier, achieved through four mechanisms: preserving tight junction proteins (TJPs), modulating pro-inflammatory cytokines, exerting antioxidant activity, and regulating the intestinal microbiota.

Bacteria in the oral cavity of individuals consuming intoxicating substances.

Food habits and oral hygiene are critical attributes for physiochemical environment of the oral cavity. Consumption of intoxicating substances such as betel nut ('Tamul'), alcohol, smoking and chewing tobacco may strongly influence the oral ecosystem including commensal microbes. Therefore, a comparative assessment of microbes in the oral cavity between individuals consuming intoxicating substances and non-consumers may indicate the influence of these substances. Oral swabs were collected from consumers of intoxicating substances and non- consumers of Assam, India, microbes were isolated by culturing on Nutrient agar and identified by phylogenetic analysis of their 16S rRNA gene sequences. The risks of consumption of intoxicating substance on occurrence of microbes and health conditions were estimated using binary logistic regression. Mostly pathogens and opportunistic pathogens were found in the oral cavity of consumers and oral cancer patients which included Pseudomonas aeruginosa, Serratia marcescens, Rhodococcus antrifimi, Paenibacillus dendritiformis, Bacillus cereus, Staphylococcus carnosus, Klebsiella michiganensis and Pseudomonas cedrina. Enterobacter hormaechei was found in the oral cavity of cancer patients but not in other cases. Pseudomonas sp. were found to be widely distributed. The risk of occurrence of these organisms were found in between 0.01 and 2.963 odds and health conditions between 0.088 and 10.148 odds on exposure to different intoxicating substances. When exposed to microbes, the risk of varying health conditions ranged between 0.108 and 2.306 odds. Chewing tobacco showed a higher risk for oral cancer (10.148 odds). Prolonged exposure to intoxicating substances conduce a favorable environment for the pathogens and opportunistic pathogens to colonize in the oral cavity of individuals consuming intoxicating substances.

The influence of partial chemical component removal on water state at high relative humidity and cell wall saturation state

Water sorption in wood is mostly determined by the cell wall pores and the availability of sorption sites. In this study, we partially removed hemicellulose and lignin to adjust hydroxyl accessibility and pore size distribution of the cell wall of beech (Fagus sylvatica). With the assistance of the two-dimensional time-domain nuclear magnetic resonance technique, the water state at high relative humidity (RH) regions and cell wall saturation state were investigated. Both hemicellulose removal and delignification brought newly created pore spaces, lowered the average pore size, and increased the specific surface area. At the same time, a decrease in hydroxyl accessibility was observed for the hemicellulose-removal samples, but an increase in delignified samples. Two cell wall waters (B-water and C-water) with different mobility and two cell lumen waters were categorized. At high RH regions, more water molecules accumulated in microfibril and its surrounding hemicellulose (the domain of B-water) with lower mobility after partial chemical components removal. In combination with the mobility change with the physiochemical environment of the water molecules, it may be established that the accumulation of B-water was affected more by the change in the physical environment. Furthermore, cell wall saturation may alter the matrix environment for both treated and untreated samples; following water saturation, the mobility of B-water increased in the delignified samples but decreased in the untreated and partially hemicellulose-removed samples.

The occurrence and genesis of HREE-rich minerals from the giant Bayan Obo deposit, China

The carbonatite-related Bayan Obo deposit, China is the largest REE resource in the world. This deposit has long been a major light REE (LREE) producer, with heavy REE (HREE) rarely exploited. In order to better understand the occurrence of HREE in the deposit, this paper conducts a study of HREE-rich minerals at Bayan Obo. Overall, four types of HREE-rich minerals are identified, including fergusonite-group mineral [(Y, REE)(Nb, Ta, Ti)O4], samarskite-group mineral [(Y, REE, Fe)2(Nb, Ta, Ti)2O8], aeschynite-group mineral [(Y, REE, Ca, Th, U)(Nb, Ta, Ti)2O6], and a type of unknown Pb-rich mineral. These minerals have HREE contents varying from 3.4 wt% to 46.4 wt%, mostly between 19.7 wt% and 34.3 wt%. Yttrium, Dy and Gd are the major REE constitute. Textual relations indicate that the HREE-rich minerals were mainly precipitated from carbonatite-related fluids, with small amounts of grains crystallized from the carbonatitic magma or deposited from post-ore modification fluids. The HREE-rich minerals occur in close temporal and/or spatial association with LREE minerals (e.g., monazite and bastnäsite), so formation of these HREE-minerals does not mean strong LREE-HREE fractionation during the ore-formation or post-ore modification process. Given that certain niobium oxides strongly prefer HREE relative to LREE in the mineral structure, a local physiochemical environment that allowed for the deposition of niobium oxides may be significant for efficient HREE deposition. Although HREE-rich minerals are not widely present in the deposit, they tend to occur as clusters in places. To determine what proportions of HREE can be hosted in the HREE-rich minerals, the weight proportions and REE contents of major REE-bearing minerals were measured in three representative ore samples. The results show that ∼ 25–57 % HREE can be hosted in fergusonite, samarskite, and/or aeschynite. Therefore, the newly identified HREE-rich minerals are non-negligible targets for future exploitation of HREE in the Bayan Obo deposit.

Engineering yeast mitochondrial metabolism for 3-hydroxypropionate production

BackgroundWith unique physiochemical environments in subcellular organelles, there has been growing interest in harnessing yeast organelles for bioproduct synthesis. Among these organelles, the yeast mitochondrion has been found to be an attractive compartment for production of terpenoids and branched-chain alcohols, which could be credited to the abundant supply of acetyl-CoA, ATP and cofactors. In this study we explored the mitochondrial potential for production of 3-hydroxypropionate (3-HP) and performed the cofactor engineering and flux control at the acetyl-CoA node to maximize 3-HP synthesis.ResultsMetabolic modeling suggested that the mitochondrion serves as a more suitable compartment for 3-HP synthesis via the malonyl-CoA pathway than the cytosol, due to the opportunity to obtain a higher maximum yield and a lower oxygen consumption. With the malonyl-CoA reductase (MCR) targeted into the mitochondria, the 3-HP production increased to 0.27 g/L compared with 0.09 g/L with MCR expressed in the cytosol. With enhanced expression of dissected MCR enzymes, the titer reached to 4.42 g/L, comparable to the highest titer achieved in the cytosol so far. Then, the mitochondrial NADPH supply was optimized by overexpressing POS5 and IDP1, which resulted in an increase in the 3-HP titer to 5.11 g/L. Furthermore, with induced expression of an ACC1 mutant in the mitochondria, the final 3-HP production reached 6.16 g/L in shake flask fermentations. The constructed strain was then evaluated in fed-batch fermentations, and produced 71.09 g/L 3-HP with a productivity of 0.71 g/L/h and a yield on glucose of 0.23 g/g.ConclusionsIn this study, the yeast mitochondrion is reported as an attractive compartment for 3-HP production. The final 3-HP titer of 71.09 g/L with a productivity of 0.71 g/L/h was achieved in fed-batch fermentations, representing the highest titer reported for Saccharomyces cerevisiae so far, that demonstrated the potential of recruiting the yeast mitochondria for further development of cell factories.

Land use modification causes slow, but predictable, change in soil microbial community composition and functional potential

BackgroundBacterial communities are critical to ecosystem functioning and sensitive to their surrounding physiochemical environment. However, the impact of land use change on microbial communities remains understudied. We used 16S rRNA gene amplicon sequencing and shotgun metagenomics to assess soil microbial communities' taxonomic and functional responses to land use change. We compared data from long-term grassland, exotic forest and horticulture reference sites to data from sites that transitioned from (i) Grassland to exotic forest or horticulture and from (ii) Exotic forest to grassland.ResultsCommunity taxonomic and functional profiles of the transitional sites significantly differed from those within reference sites representing both their historic and current land uses (P < 0.001). The bacterial communities in sites that transitioned more recently were compositionally more similar to those representing their historic land uses. In contrast, the composition of communities from sites exposed to older conversion events had shifted towards the compositions at reference sites representing their current land use.ConclusionsOur study indicates that microbial communities respond in a somewhat predictable way after a land use conversion event by shifting from communities reflecting their former land use towards those reflecting their current land use. Our findings help us to better understand the legacy effects of land use change on soil microbial communities and implications for their role in soil health and ecosystem functioning. Understanding the responsiveness of microbial communities to environmental disturbances will aid us in incorporating biotic variables into soil health monitoring techniques in the future.

MP05-16 THE DEVELOPMENT OF A THREE-DIMENSIONAL KIDNEY SPHEROID MODEL TO STUDY CALCIUM-BASED CRYSTAL FORMATION

You have accessJournal of UrologyCME1 Apr 2023MP05-16 THE DEVELOPMENT OF A THREE-DIMENSIONAL KIDNEY SPHEROID MODEL TO STUDY CALCIUM-BASED CRYSTAL FORMATION John Chmiel, Wongsakorn Kiattiburut, Aaron Kwong, Priyanka Prabhu, Hassan Razvi, Leonard Luyt, Jeremy Burton, and Jennifer Bjazevic John ChmielJohn Chmiel More articles by this author , Wongsakorn KiattiburutWongsakorn Kiattiburut More articles by this author , Aaron KwongAaron Kwong More articles by this author , Priyanka PrabhuPriyanka Prabhu More articles by this author , Hassan RazviHassan Razvi More articles by this author , Leonard LuytLeonard Luyt More articles by this author , Jeremy BurtonJeremy Burton More articles by this author , and Jennifer BjazevicJennifer Bjazevic More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000003216.16AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: An estimated 10% of North Americans suffer from nephrolithiasis. With rising incidence rates, there is a strong need for models to study the pathophysiology of stone disease. In vitro cell culture models are essential for mechanistic and high-throughput analysis of stone formation and drug treatment; however, there are no suitable models that adequately represent the pathophysiology of stone disease. Advancements in cell culture have given rise to three-dimensional cysts, which are hollow spheroid structures that have apical to basal polarization. These culture systems have similar physiochemical environments to in vivo models and can be cultured for the extended times required for stone formation. Here, we developed a novel 3D kidney cyst model that can generate calcium-based kidney stones. METHODS: Madin-Darby canine kidney (MDCK) cells were cultured in suspension in growth factor-reduced Matrigel to generate hollow spheroid cysts. Crystal formation was induced by culturing cysts in a custom crystal-forming media for two weeks. Immunofluorescent staining was used for characterizing and visualizing the three-dimensional structure. Alendronate-fluorescein, a fluorescently labelled bisphosphonate that specifically binds to calcium-containing crystals, was used along with plain polarized light to visualize the crystal structures. RESULTS: Stains for cellular components and structures demonstrated that the luminal spheroids were successfully formed under the culture conditions. The spheroids also have basal-to-apical polarization suggesting that crystals will form on the inside lumen of the hollow cyst. Birefringent structures resembling calcium oxalate dihydrate and calcium phosphate crystals were observed embedded along the apical face of the spheroid and protruding into the lumen. Alendronate-fluorescein staining confirmed the presence of calcium-containing crystals in the lumen of the cyst. CONCLUSIONS: We have demonstrated that hollow MDCK spheroids cultured with crystal-forming media can generate calcium-containing crystals in the spheroid lumen. This model is the first in vitro tissue culture-based model to reliably develop calcium-based crystals and can be used to investigate their pathogenesis or to perform high-throughput drug screening. Furthermore, it paves the way for personalized medicine by building the foundation for a cell system where renal tissue can be harvested and cultured to identify individual intrinsic risk factors that might contribute to stone development. Source of Funding: Canadian Institutes of Health Research (CIHR) CGS-D, The Northeastern Section of the American Urological Association (NSAUA), Lawson Health Research © 2023 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 209Issue Supplement 4April 2023Page: e49 Advertisement Copyright & Permissions© 2023 by American Urological Association Education and Research, Inc.MetricsAuthor Information John Chmiel More articles by this author Wongsakorn Kiattiburut More articles by this author Aaron Kwong More articles by this author Priyanka Prabhu More articles by this author Hassan Razvi More articles by this author Leonard Luyt More articles by this author Jeremy Burton More articles by this author Jennifer Bjazevic More articles by this author Expand All Advertisement PDF downloadLoading ...

Compartmentalization engineering of yeasts to overcome precursor limitations and cytotoxicity in terpenoid production.

Metabolic engineering strategies for terpenoid production have mainly focused on bottlenecks in the supply of precursor molecules and cytotoxicity to terpenoids. In recent years, the strategies involving compartmentalization in eukaryotic cells has rapidly developed and have provided several advantages in the supply of precursors, cofactors and a suitable physiochemical environment for product storage. In this review, we provide a comprehensive analysis of organelle compartmentalization for terpenoid production, which can guide the rewiring of subcellular metabolism to make full use of precursors, reduce metabolite toxicity, as well as provide suitable storage capacity and environment. Additionally, the strategies that can enhance the efficiency of a relocated pathway by increasing the number and size of organelles, expanding the cell membrane and targeting metabolic pathways in several organelles are also discussed. Finally, the challenges and future perspectives of this approach for the terpenoid biosynthesis are also discussed.

Simulations of human hemodynamic responses to blood temperature and volume changes

An advanced version (AV) of special software based on modified quantitative models of mechanisms that provide the overall control of human circulation is proposed. AV essentially expands the range of tasks concerning the modeling of cardiovascular physiology, in particular, the range of mechanisms controlling cardiac function, vascular hemodynamics, and total blood volume under unstable internal/ external physiochemical environments. The models are verified on data representing hemodynamic responses to certain physical tests. In the publication, two test scenarios, namely blood temperature and volume dynamic alterations, have been simulated and analyzed in detail. The user-friendly interface provides all stages of preparation and analysis of computer simulation. The PC-based simulator can also be used for educational purposes.

Engineered Biomimetic Membranes for Organ-on-a-Chip.

Organ-on-a-chip (OOC) systems are engineered nanobiosystems to mimic the physiochemical environment of a specific organ in the body. Among various components of OOC systems, biomimetic membranes have been regarded as one of the most important key components to develop controllable biomimetic bioanalysis systems. Here, we review the preparation and characterization of biomimetic membranes in comparison with the features of the extracellular matrix. After that, we review and discuss the latest applications of engineered biomimetic membranes to fabricate various organs on a chip, such as liver, kidney, intestine, lung, skin, heart, vasculature and blood vessels, brain, and multiorgans with perspectives for further biomedical applications.

Polysaccharides from Artocarpus heterophyllus Lam. (jackfruit) pulp improves intestinal barrier functions of high fat diet-induced obese rats.

Polysaccharides show protective effects on intestinal barrier function due to their effectiveness in mitigating oxidative damage, inflammation and probiotic effects. Little has been known about the effects of polysaccharides from Artocarpus heterophyllus Lam. pulp (jackfruit, JFP-Ps) on intestinal barrier function. This study aimed to investigate the effects of JFP-Ps on intestinal barrier function in high fat diet-induced obese rats. H&E staining and biochemical analysis were performed to measure the pathological and inflammatory state of the intestine as well as oxidative damage. Expression of the genes and proteins associated with intestinal health and inflammation were analyzed by RT-qPCR and western blots. Results showed that JFP-Ps promoted bowel movements and modified intestinal physiochemical environment by lowering fecal pH and increasing fecal water content. JFP-Ps also alleviated oxidative damage of the colon, relieved intestinal colonic inflammation, and regulated blood glucose transport in the small intestine. In addition, JFP-Ps modified intestinal physiological status through repairing intestinal mucosal damage and increasing the thickness of the mucus layer. Furthermore, JFP-Ps downregulated the inflammatory genes (TNF-α, IL-6) and up-regulated the free fatty acid receptors (GPR41 and GPR43) and tight junction protein (occludin). These results revealed that JFP-Ps showed a protective effect on intestinal function through enhancing the biological, mucosal, immune and mechanical barrier functions of the intestine, and activating SCFAs-GPR41/GPR43 related signaling pathways. JFP-Ps may be used as a promising phytochemical to improve human intestinal health.

Affinity microfluidics enables high-throughput protein degradation analysis in cell-free extracts

Protein degradation mediated by the ubiquitin-proteasome pathway regulates signaling events in many physiological and pathological conditions. In vitro degradation assays have been instrumental in the understanding of how cell proliferation and other fundamental cellular processes are regulated. These assays are direct, time-specific and highly informative but also laborious, typically relying on low-throughput polyacrylamide gel-electrophoresis followed by autoradiography or immunoblotting. We present protein degradation on chip (pDOC), a MITOMI-based integrated microfluidic technology for discovery and analysis of proteins degradation in cell-free extracts. The platform accommodates hundreds of microchambers on which protein degradation is assayed quickly, simultaneously and using minute amounts of reagents in one or many physiochemical environments. Essentially, pDOC provides a sensitive multiplex alternative to the conventional degradation assay, with relevance to biomedical and translational research associated with regulated proteolysis.

Photo excitation of silver ions during the synthesis of silver nanoparticles modify physiological, chemical, and biological properties

Physio-chemical environment changes the morphological and biochemical properties of nanoparticles. The study was aimed to find the change in biological properties of silver nanoparticles synthesized under visible photon flux. The NPs were characterized for antioxidative, antimicrobial, enzyme inhibition, and nanozyme properties. The use of low-intensity LEDs as excitation sources lead to greater versatility in the formation of well-defined SNPs. XRD spectra exhibited the purity and face-centered cubic crystal structures of SNPs and the sizes are within 16–25 nm. SEM images revealed spherical, elliptical, and rod shapes of SNPs. Remarkable activities were observed by daylight SNPs in free radical scavenging potential (49.41 ± 0.29%), total antioxidant activity (65.71 ± 0.89 µg AAE/mg), and metal chelating (48.90 ± 0.24%) while the strongest activity was found by green light SNPs in total reducing power and ABTS assays. Daylight SNPs showed significant alpha-amylase (71.7 ± 0.73%), urease inhibition (89.3 ± 0.66%) activities while dark SNPs were significant in inhibition of lipase (89.8 ± 0.44%). The intrinsic peroxidase-like activity of photo-excited SNPs as nanozyme was also noteworthy. Significant antibacterial activity was shown by daylight and blue light SNPs against MRSA and P. aeruginosa. This study represents a significant step by employing low-intensity LED lights for the synthesis of silver nanoparticles and extends a great prospect in different fields.