• MeSH
• buněčný tracking metody   MeSH
• fluor chemie   MeSH
• fluorokarbony MeSH
• kontrastní látky MeSH
• pohyb buněk MeSH
• zobrazování fluorovou magnetickou rezonancí MeSH

• Konspekt
• Patologie. Klinická medicína
• NLK Obory
• radiologie, nukleární medicína a zobrazovací metody
• NLK Publikační typ
• kolektivní monografie

Endocrine-disrupting chemicals (EDCs) may contribute to the rising incidence of metabolic dysfunction-associated steatotic liver disease (MASLD). We investigated the potential of 10 environmentally relevant EDCs to affect key events of hepatic steatosis in HepG2 human hepatoblastoma cells. Increased lipid droplet formation, a key marker of steatosis, was induced by PFOA, bisphenol F, DDE, butylparaben, and DEHP, within the non-cytotoxic concentration range of 1 nM-25 μM. Cadmium also induced this effect, but at concentrations impairing cell viability (>1 μM). At non-cytotoxic concentrations, these compounds, along with bisphenol A, dysregulated major genes controlling lipid homeostasis. Cadmium, PFOA, DDE, and DEHP significantly upregulated the DGAT1 gene involved in triglyceride synthesis, while butylparaben increased the expression of the FAT/CD36 gene responsible for fatty acid uptake. Bisphenol A downregulated the CPT1A gene involved in fatty acid oxidation. No significant effects on lipid droplet accumulation or lipid metabolism-related genes were observed for PFOS, bisphenol S, and dibutyl phthalate. Among the tested EDCs, lipid accumulation positively correlated with the expression of SREBF1, DGAT1, and CPT1A. These findings provide additional evidence that EDCs can affect MASLD and highlight the utility of in vitro methods in the screening of EDCs with hazardous steatogenic and metabolism-disrupting properties.

• MeSH
• benzhydrylové sloučeniny toxicita   MeSH
• buňky Hep G2 MeSH
• diacylglycerol-O-acyltransferasa genetika   metabolismus   MeSH
• diethylhexylftalát toxicita   MeSH
• endokrinní disruptory * toxicita   MeSH
• fenoly toxicita   MeSH
• fluorokarbony toxicita   MeSH
• kapryláty toxicita   MeSH
• lidé MeSH
• metabolismus lipidů účinky léků   MeSH
• sloučeniny bisfenolu A MeSH
• viabilita buněk účinky léků   MeSH
• ztučnělá játra * chemicky indukované   metabolismus   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

This study investigates the presence of perfluoroalkyl substances (PFAS) in the drinking water supplies in the Czech Republic using a risk-based monitoring approach. Tap water samples (n = 27) from sources close to areas potentially contaminated with PFAS were analysed. A total of 28 PFAS were measured using ultra-performance liquid chromatography with tandem mass spectrometry after solid phase extraction. Total PFAS concentrations (∑PFAS) varied from undetectable to 90.8 ng/L, with perfluoropentanoic acid (PFPeA), perfluorohexanoic acid (PFHxA), perfluoroheptanoic acid (PFHpA) and perfluorobutane sulfonic acid (PFBS) being the most abundant, detected in over 70% of samples. Risk-based monitoring in drinking water showed that commercial wells had higher PFAS levels compared to tap water, particularly C4-C9 perfluorocarboxylic acids (PFCAs), possibly due to proximity to industrial areas. However, the hypothesis that risk-based monitoring is more effective than random monitoring was not confirmed, possibly because specific sources did not produce the target PFAS or because of the wide range and less obvious sources of potential contamination. The study also assessed exposure risks and compliance with regulatory thresholds. Weekly intake estimates for adults and children indicated that regular consumption of most contaminated water sample would exceed the tolerable weekly intake. Compared to EU regulations, none of the tap water samples exceeded the 'Sum of PFAS' parametric value of 100 ng/L, though one sample approached this limit. In addition, surface water samples from the Jizera River (n = 21) showed a wider range of PFAS, with C7-C10 PFCAs, PFBS, and perfluorooctane sulfonic acid (PFOS) in every sample, with higher PFOS concentrations at a median of 2.56 ng/L. ∑PFAS concentrations increased downstream, rising from 1.08 ng/L near the spring to 26 ng/L downstream. This comprehensive analysis highlights the need for detailed/areal monitoring to also address hidden or non-obvious sources of PFAS contamination.

• MeSH
• chemické látky znečišťující vodu * analýza   MeSH
• extrakce na pevné fázi MeSH
• fluorokarbony * analýza   MeSH
• hodnocení rizik MeSH
• lidé MeSH
• monitorování životního prostředí * metody   MeSH
• pitná voda * chemie   MeSH
• tandemová hmotnostní spektrometrie MeSH
• vystavení vlivu životního prostředí analýza   statistika a číselné údaje   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Česká republika MeSH

While the immunomodulation effects of per- and polyfluoroalkyl substances (PFASs) are described on the level of clinical signs in epidemiological studies (e.g., suppressed antibody response after vaccination), the underlying mechanism has still not been fully elucidated. To reveal mechanisms of PFAS exposure on immunity, we investigated the genome-wide transcriptomic changes of peripheral blood mononuclear cells (PBMCs) responding to PFAS exposure (specifically, exposure to PFPA, PFOA, PFNA, PFDA, PFUnDA, PFHxS, and PFOS). Blood samples and the chemical load in the blood were analyzed under the cross-sectional CELSPAC: Young Adults study. The overall aim of the study was to identify sensitive gene sets and cellular pathways conserved for multiple PFAS chemicals. Transcriptome networks related to adaptive immunity were perturbed by multiple PFAS exposure (i.e., blood levels of at least four PFASs). Specifically, processes tightly connected with late B cell development, such as B cell receptor signaling, germinal center reactions, and plasma cell development, were shown to be affected. Our comprehensive transcriptome analysis identified the disruption of B cell development, specifically the impact on the maturation of antibody-secreting cells, as a potential mechanism underlying PFAS immunotoxicity.

• MeSH
• fluorokarbony * toxicita   MeSH
• kyseliny alkansulfonové * MeSH
• látky znečišťující životní prostředí * MeSH
• leukocyty mononukleární MeSH
• lidé MeSH
• mladý dospělý MeSH
• průřezové studie MeSH
• transkriptom MeSH
• Check Tag
• lidé MeSH
• mladý dospělý MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Česká republika MeSH

Na perfluoralkylové látky (PFAS) je v posledních letech soustředěná pozornost širší veřejnosti, protože to jsou látky znečišťující životní prostředí. Jsou to např. kyselina perfluoroktanová a perfluoroktansulfonová. Tyto látky vznikají průmyslovou aktivitou člověka především při výrobě polymerů nebo nepřilnavých povrchů. Odpadní vodou nebo i jinými cestami se mohou dostat do prostředí, a tak kontaminovat zdroje pitné vody nebo potraviny. Jejich působení na organismy a lidské zdraví je rozsáhle studováno a jejich přítomnosti v organismu je připisován vliv na mnohé zdravotní komplikace, dokonce i některé druhy rakoviny. Z toho důvodu byly stanoveny přípustné limity PFAS v pitné vodě a jejich regulací se zabývají mnohé státní orgány a mezinárodní organizace. Aktuálním standardem v detekci PFAS jsou chromatografické metody. V současnosti jsou zkoumány i nové metody detekce především optickou a elektrochemickou cestou. Jejich příklady jsou v textu detailněji popsány a diskutovány.

Perfluoroalkyl substances (PFAS) have gained wider public attention in recent years as environmental pollutants which include perfluorooctanoic acid and perfluorooctanesulfonic acid. These substances are produced by industry, mainly during the manufacture of polymers or non-stick surfaces. They can enter the environment through waste water or other routes and contaminate drinking water sources or food. Their effects on organisms and human health have been extensively studied and their presence in the body has been attributed to many health complications including cancer. For this reason, limits for PFAS in drinking water have been established and their regulation is being addressed by many governments and international organisations. Chromatographic methods are the current standard for PFAS detection, but new detection methods, mainly optical and electrochemical, are currently being investigated. Examples of these are described in more detail in the text.

• MeSH
• elektrochemické techniky klasifikace   metody   MeSH
• fluorescenční spektrometrie metody   MeSH
• fluorokarbony * analýza   chemie   škodlivé účinky   toxicita   MeSH
• hodnocení vlivů na zdraví metody   MeSH
• impedanční spektroskopie metody   MeSH
• kontaminace potravin MeSH
• látky znečišťující životní prostředí analýza   klasifikace   škodlivé účinky   MeSH
• lidé MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• práce podpořená grantem MeSH
• přehledy MeSH

Cíl studie: zhodnocení účinnosti pneumatické vitreolýzy pro rozrušení vitreomakulární trakce (VMT) na vlastním souboru pacientů. Materiál a metodika: Prospektivní sledování 21 očí 18 pacientů s fokální VMT (šířka adheze < 1500 μm), kteří podstoupili intravitreální aplikaci 0,3 ml 100% perfluoropropanu v období od ledna 2015 do prosince 2020. Pacienti byli sledováni po dobu 90 dnů. Výsledky: Uvolnění VMT bylo dosaženo 28. den sledování u 15 očí z 21 (71,4 %), 90. den u 19 z 21 očí (90,5 %). Průměrná šíře adheze našich pacientů byla 382 μm (±212 μm). Průměrná nejlepší korigovaná zraková ostrost našeho souboru byla vstupně 0,77 (±0,21), po 28 dnech 0,74 (±0,30), po 3 měsících 0,82 (±0,21). Na konci sledovacího období jsme nepozorovali statisticky významné zlepšení zrakové ostrosti. U dvou očí se po aplikaci vytvořila makulární díra, která se ale spontánně uzavřela do 1 měsíce sledování, více komplikací jsme v souboru nepozorovali. Závěr: Pneumatická vitreolýza intravitreální injekcí plynu C3F8 představuje účinnou a levnou variantu řešení symptomatické vitreomakulární trakce. Výskyt závažných nežádoucích účinků v našem sledování byl výrazně nižší než u recentně publikovaných souborů. Metodu řešení je potřeba volit individuálně dle parametrů adheze, makulární díry a přidružených patologií oka.

Purpose: Evaluation of the effectiveness of pneumatic vitreolysis in disrupting vitreomacular traction in our own cohort of patients. Methodology: Prospective follow-up of 21 eyes of 18 patients with focal VMT (adhesion width < 1500 μm) who underwent intravitreal injection of 0.3 ml of 100% perfluoropropane between January 2015 and December 2020. The patients were observed for 90 days. Results: Release of VMT was achieved on the 28th day of observation in 15 out of 21 eyes (71.4%), and by the 90th day in 19 out of 21 eyes (90.5%). The average width of adhesion in our patients was 382 μm (±212 μm). Average best corrected visual acuity in our cohort was initially 0.77 (±0.21), after 28 days 0.74 (±0.30), and after 3 months 0.82 (±0.21). At the end of the follow-up period, we did not observe a statistically significant improvement in vision. Macular holes developed in two eyes, but spontaneously closed within 1 month of observation, and no more complications were observed in the cohort. Conclusion: Pneumatic vitreolysis by intravitreal injection of C3F8 gas is an effective and inexpensive option for the management of symptomatic vitreomacular traction. The incidence of serious adverse events in our follow-up was significantly lower than in recently published series. The method of management should be selected individually according to the parameters of adhesion, macular hole and associated ocular pathologies.

• Klíčová slova
• perfluoropropan, vitreomakulární trakce, pneumatická vitreolýza,
• MeSH
• fluorokarbony klasifikace   terapeutické užití   MeSH
• injekce intravitreální klasifikace   metody   MeSH
• lidé MeSH
• odchlípení sklivce * chirurgie   terapie   MeSH
• oftalmologické chirurgické výkony * klasifikace   metody   MeSH
• perforace sítnice chirurgie   klasifikace   terapie   MeSH
• prospektivní studie MeSH
• vitrektomie klasifikace   metody   MeSH
• výsledek terapie MeSH
• Check Tag
• lidé MeSH

The increasing use of industrial chemicals has raised concerns regarding exposure to endocrine-disrupting chemicals (EDCs), which interfere with developmental, reproductive and metabolic processes. Of particular concern is their interaction with adipose tissue, a vital component of the endocrine system regulating metabolic and hormonal functions. The SGBS (Simpson Golabi Behmel Syndrome) cell line, a well-established human-relevant model for adipocyte research, closely mimics native adipocytes' properties. It responds to hormonal stimuli, undergoes adipogenesis and has been successfully used to study the impact of EDCs on adipose biology. In this study, we screened human exposure-relevant doses of various EDCs on the SGBS cell line to investigate their effects on viability, lipid accumulation and adipogenesis-related protein expression. Submicromolar doses were generally well tolerated; however, at higher doses, EDCs compromised cell viability, with cadmium chloride (CdCl2) showing the most pronounced effects. Intracellular lipid levels remained unaffected by EDCs, except for tributyltin (TBT), used as a positive control, which induced a significant increase. Analysis of adipogenesis-related protein expression revealed several effects, including downregulation of fatty acid-binding protein 4 (FABP4) by dibutyl phthalate, upregulation by CdCl2 and downregulation of perilipin 1 and FABP4 by perfluorooctanoic acid. Additionally, TBT induced dose-dependent upregulation of C/EBPα, perilipin 1 and FABP4 protein expression. These findings underscore the importance of employing appropriate models to study EDC-adipocyte interactions. Conclusions from this research could guide strategies to reduce the negative impacts of EDC exposure on adipose tissue.

• MeSH
• adipogeneze * účinky léků   MeSH
• buněčné linie MeSH
• endokrinní disruptory * toxicita   MeSH
• fluorokarbony toxicita   MeSH
• kapryláty toxicita   MeSH
• lidé MeSH
• metabolismus lipidů účinky léků   MeSH
• proteiny vázající mastné kyseliny * metabolismus   genetika   MeSH
• trialkylcínové sloučeniny toxicita   MeSH
• tuková tkáň účinky léků   metabolismus   MeSH
• tukové buňky účinky léků   metabolismus   MeSH
• viabilita buněk * účinky léků   MeSH
• vztah mezi dávkou a účinkem léčiva MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

The adsorption process efficiently removes per- and polyfluoroalkyl substances (PFAS) from water, but managing exhausted adsorbents presents notable environmental and economic challenges. Conventional disposal methods, such as incineration, may reintroduce PFAS into the environment. Therefore, advanced regeneration techniques are imperative to prevent leaching during disposal and enhance sustainability and cost-effectiveness. This review critically evaluates thermal and chemical regeneration approaches for PFAS-laden adsorbents, elucidating their operational mechanisms, the influence of water quality parameters, and their inherent advantages and limitations. Thermal regeneration achieves notable desorption efficiencies, reaching up to 99% for activated carbon. However, it requires significant energy input and risks compromising the adsorbent's structural integrity, resulting in considerable mass loss (10-20%). In contrast, chemical regeneration presents a diverse efficiency landscape across different regenerants, including water, acidic/basic, salt, solvent, and multi-component solutions. Multi-component solutions demonstrate superior efficiency (>90%) compared to solvent-based solutions (12.50%), which, in turn, outperform salt (2.34%), acidic/basic (1.17%), and water (0.40%) regenerants. This hierarchical effectiveness underscores the nuanced nature of chemical regeneration, significantly influenced by factors such as regenerant composition, the molecular structure of PFAS, and the presence of organic co-contaminants. Exploring the conditional efficacy of thermal and chemical regeneration methods underscores the imperative of strategic selection based on specific types of PFAS and material properties. By emphasizing the limitations and potential of particular regeneration schemes and advocating for future research directions, such as exploring persulfate activation treatments, this review aims to catalyze the development of more effective regeneration processes. The ultimate goal is to ensure water quality and public health protection through environmentally sound solutions for PFAS remediation efforts.

• Publikační typ
• časopisecké články MeSH
• přehledy MeSH

V únoru roku 2023 oznámila Evropská agentura pro chemické látky (ECHA), že má k dispozici očekávaný podrobný návrh na omezení více než 10 000 perfluorovaných a polyfluorovaných alkylových látek (PFAS) podle nařízení o registraci, hodnocení, povolování a omezování chemických látek (REACH). Vnitrostátní orgány Dánska, Německa, Nizozemska, Norska a Švédska předložily návrh poté, co zjistily rizika při výrobě, uvádění na trh a používání PFAS. Podle jejich názoru nejsou látky dostatečně kontrolovány a je třeba je řešit na celoevropské úrovni. Tento článek se zaměřuje na důsledky navrhovaného omezení PFAS pro spotřebitele a trhy, přičemž analyzuje možné dopady na průmysl a každodenní život. Dále diskutuje výskyt PFAS v prostředí a dopad těchto perzistentních látek na zdraví lidí a životní prostředí.

In February 2023, the European Chemicals Agency (ECHA) announced that it has an expected detailed proposal for the restriction of more than 10,000 per- and polyfluoroalkyl substances (PFAS) under the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) Regulation. The national authorities of Denmark, Germany, the Netherlands, Norway and Sweden submitted the proposal after identifying risks in the production, marketing and use of PFAS. In their view, the substances are not sufficiently controlled and need to be addressed at EU level. This article focuses on the implications of the proposed restriction of PFAS for consumers and markets, analysing the possible impacts on industry and everyday life. It also discusses the occurrence of PFAS in the environment and the impact of these persistent compounds on human health and the environment.

• MeSH
• fluorované uhlovodíky chemie   MeSH
• látky znečišťující životní prostředí analýza   škodlivé účinky   MeSH
• lidé MeSH
• monitorování životního prostředí zákonodárství a právo   MeSH
• perzistentní organické znečišťující látky * škodlivé účinky   toxicita   MeSH
• Check Tag
• lidé MeSH

Chemical exposures often occur in mixtures and exposures during pregnancy may lead to adverse effects on the fetal brain, potentially reducing lower cognitive abilities and fine motor function of the child. We investigated the association of motheŕs exposure to a mixture of chemicals during pregnancy (i.e., organochlorine compounds, per- and polyfluoroalkyl substances, phenols, phthalates, organophosphate pesticides) with cognitive abilties and fine motor function in their children. We studied 1097 mother-child pairs from five European cohorts participating in the Human Early Life Exposome study (HELIX). Measurement of 26 biomarkers of exposure to chemicals was performed on urine or blood samples of pregnant women (mean age 31 years). Cognitive abilities and fine motor function were assessed in their children (mean age 8 years) with a battery of computerized tests administered in person (Raveńs Coloured Progressive Matrices, Attention Network Test, N-back Test, Trail Making Test, Finger Tapping Test). We estimated the joint effect of prenatal exposure to chemicals on cognitive abilities and fine motor function using the quantile-based g-computation method, adjusting for sociodemographic characteristics. A quartile increase in all the chemicals in the overall mixture was associated with worse fine motor function, specifically lower scores in the Finger Tapping Test [-8.5 points, 95 % confidence interval (CI) -13.6 to -3.4; -14.5 points, 95 % CI -22.4 to -6.6, and -18.0 points, 95 % CI -28.6 to -7.4) for the second, third and fourth quartile of the overal mixture, respectively, when compared to the first quartile]. Organochlorine compounds, phthalates, and per- and polyfluoroalkyl substances contributed most to this association. We did not find a relationship with cognitive abilities. We conclude that exposure to chemical mixtures during pregnancy may influence neurodevelopment, impacting fine motor function of the offspring.

• MeSH
• chlorované uhlovodíky * MeSH
• dítě MeSH
• dospělí MeSH
• fluorokarbony * MeSH
• kognice MeSH
• kyseliny ftalové * MeSH
• látky znečišťující životní prostředí * toxicita   MeSH
• lidé MeSH
• matka - expozice noxám škodlivé účinky   MeSH
• těhotenství MeSH
• zpožděný efekt prenatální expozice * MeSH
• Check Tag
• dítě MeSH
• dospělí MeSH
• lidé MeSH
• těhotenství MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH