Activating transcription factor 4 (ATF4) is a master transcriptional regulator of the integrated stress response, leading cells toward adaptation or death. ATF4's induction under stress was thought to be due to delayed translation reinitiation, where the reinitiation-permissive upstream open reading frame 1 (uORF1) plays a key role. Accumulating evidence challenging this mechanism as the sole source of ATF4 translation control prompted us to investigate additional regulatory routes. We identified a highly conserved stem-loop in the uORF2/ATF4 overlap, immediately preceded by a near-cognate CUG, which introduces another layer of regulation in the form of ribosome queuing. These elements explain how the inhibitory uORF2 can be translated under stress, confirming prior observations but contradicting the original regulatory model. We also identified two highly conserved, potentially modified adenines performing antagonistic roles. Finally, we demonstrated that the canonical ATF4 translation start site is substantially leaky scanned. Thus, ATF4's translational control is more complex than originally described, underpinning its key role in diverse biological processes.
- MeSH
- fyziologický stres MeSH
- HEK293 buňky MeSH
- lidé MeSH
- otevřené čtecí rámce * genetika MeSH
- proteosyntéza * MeSH
- ribozomy * metabolismus MeSH
- sekvence nukleotidů MeSH
- transkripční faktor ATF4 * metabolismus genetika MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
BACKGROUND: Tumor necrosis factor-alpha (TNF-α) agonists revolutionized therapeutic algorithms in inflammatory bowel disease (IBD) management. However, approximately every third IBD patient does not respond to this therapy in the long term, which delays efficient control of the intestinal inflammation. METHODS: We analyzed the power of serum biomarkers to predict the failure of anti-TNF-α. We collected serum of 38 IBD patients at therapy prescription and 38 weeks later and analyzed them with relation to therapy response (no-, partial-, and full response). We used enzyme-linked immunosorbent assay to quantify 16 biomarkers related to gut barrier (intestinal fatty acid-binding protein, liver fatty acid-binding protein, trefoil factor 3, and interleukin (IL)-33), microbial translocation, immune system regulation (TNF-α, CD14, lipopolysaccharide-binding protein, mannan-binding lectin, IL-18, transforming growth factor-β1 (TGF-β1), osteoprotegerin (OPG), insulin-like growth factor 2 (IGF-2), endocrine-gland-derived vascular endothelial growth factor), and matrix metalloproteinase system (MMP-9, MMP-14, and tissue inhibitors of metalloproteinase-1). RESULTS: We found that future full-responders have different biomarker profiles than non-responders, while partial-responders cannot be distinguished from either group. When future non-responders were compared to responders, their baseline contained significantly more TGF-β1, less CD14, and increased level of MMP-9, and concentration of these factors could predict non-responders with high accuracy (AUC = 0.938). Interestingly, during the 38 weeks, levels of MMP-9 decreased in all patients, irrespective of the outcome, while OPG, IGF-2, and TGF-β1 were higher in non-responders compared to full-responders both at the beginning and the end of the treatment. CONCLUSIONS: The TGF-β1 and CD14 can distinguish non-responders from responders. The changes in biomarker dynamics during the therapy suggest that growth factors (such as OPG, IGF-2, and TGF-β) are not markedly influenced by the treatment and that anti-TNF-α therapy decreases MMP-9 without influencing the treatment outcome.
Úvod: Fabryho choroba je vzácné dědičné střádavé onemocnění postihující různé orgány včetně vestibulokochleárního aparátu a může vést k předčasné hypakuzi a tinnitu. Časná a správná dia gnostika Fabryho choroby je důležitá pro zahájení terapie. Cíl práce: Cílem práce bylo zhodnocení hypakuze u pacientů s Fabryho chorobou, porovnání rozdílů mezi muži a ženami a mezi jednotlivými fenotypy. Materiál a metodika: Byla provedena retrospektivní studie u pacientů vyšetřených v naší ambulanci v rozmezí let 2016–2020 tónovou audiometrií na 7 frekvencích (0,125–8 kHz). Pacientům byly zhodnoceny audiometrické křivky na pravém a levém uchu, spočítány průměrné procentuální ztráty dle Fowlera na pravém a levém uchu a celkové, dále byly spočítány průměrné procentuální ztráty dle Fowlera u jednotlivých fenotypů Fabryho choroby. Závěrem jsme porovnali vývoj hypakuze v čase u pacientů vyšetřených vícekrát. Výsledky: Bylo vyšetřeno 121 pacientů (55 mužů a 66 žen) s prokázanou Fabryho chorobou. Ženy měly percepční hypakuzi vpravo ve 48,5 % a vlevo v 50 % případů. Kombinovanou hypakuzi mělo 1,5 % žen. Muži měli percepční hypakuzi vpravo v 63,6 % a vlevo v 65,5 %. Kombinovanou hypakuzi mělo 1,8 % mužů. Celkové průměrné procentuální ztráty dle Fowlera byly u žen 8,8 % a u mužů 14,8 %. Ženy s klasickým fenotypem měly statisticky významně horší sluch než ženy s ostatními fenotypy. U mužů nebyl žádný fenotyp statisticky významně horší. Závěr: Pacienti s Fabryho chorobu v našem souboru měli nejčastěji percepční hypakuzi. Hypakuze u mužů s Fabryho chorobou byla statisticky významně horší než u žen.
Introduction: Fabry disease (FD) is a rare hereditary lysosomal storage disease aff ecting diff erent organs, including the cochlea-vestibular system. It can lead to premature hearing loss and tinnitus. Early and correct dia gnosis of FD is important with a view of available therapy. Purpose: The aim of this study is to evaluate the degree of hearing loss in patients with FD. Additionally, to compare diff erences between male and female patients as well as the diff erences of types of FD in patients with diff erent phenotypes. Methods: This is a retrospective study of patients that had been examined in our out-patient offi ce in the years 2016–2020. We used 7-tone pure-tone audiometry (0,125–8 kHz). We compared audiograms of patients right and left ear, calculated average Fowler percentage of hearing loss on left ear, right ear and combined. We compared combined Fowler percentage of hearing loss in diff erent types of FD based on the disease phenotype. Moreover, we compared the progress of hearing loss in time in patients that were examined in our offi ce more than once. Results: We examined 121 patients (55 male, 66 female) with dia gnosed FD. Female patients exhibited 48.5% hearing loss in the right ear and 50% in the left ear. Mixed hearing loss occurred in 1.5% of females in the group. We observed sensorineural hearing loss in 63.6% in the right ear and 65.5% in the left ear within male patients. Mixed hearing loss appeared in 1.8% of male patients. Combined mean Fowler percentage of hearing loss in females was 8.8 % and in males 14.8 %. Female patients with the classic type of FD had signifi cantly worse hearing than females with any other type of FD. This was not observed in the male group. Conclusion: Patients with FD in our group of patients had mostly sensorineural hearing loss. Hearing loss of male patients with FD was signifi cantly worse than females.
- MeSH
- audiometrie MeSH
- dospělí MeSH
- Fabryho nemoc * diagnóza genetika terapie MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladiství MeSH
- nedoslýchavost * diagnóza MeSH
- retrospektivní studie MeSH
- senioři MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladiství MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
AIMS: Ovarian hormone deficiency is one of the main risk factors for osteoporosis and bone fractures in women, and these risks can be mitigated by menopausal hormone therapy. Recent evidence suggests that gut microbiota may link changes in estrogen levels and bone metabolism. This study was conducted to investigate the potential relationship between hormonal and bone changes induced by oophorectomy and subsequent hormonal therapy and shifts in gut microbiota composition. METHODS: We collected 159 stool and blood samples in several intervals from 58 women, who underwent bilateral oophorectomy. Changes in fecal microbiota were assessed in paired samples collected from each woman before and after oophorectomy or the start of hormone therapy. Bacterial composition was determined by sequencing the 16S rRNA gene on Illumina MiSeq. Blood levels of estradiol, FSH, biomarkers of bone metabolism, and indices of low-grade inflammation were measured using laboratory analytical systems and commercial ELISA. Areal bone mineral density (BMD) of the lumbar spine, proximal femur, and femur neck was measured using dual-energy X-ray absorptiometry. RESULTS: We found no significant changes in gut microbiota composition 6 months after oophorectomy, despite major changes in hormone levels, BMD, and bone metabolism. A small decrease in bacterial diversity was apparent 18 months after surgery in taxonomy-aware metrics. Hormonal therapy after oophorectomy prevented bone loss but only marginally affected gut microbiota. There were no significant differences in β-diversity related to hormonal status, although several microbes (e.g., Lactococcus lactis) followed estrogen levels. Body mass index (BMI) was the most significantly associated with microbiota variance. Microbiota was not a suitable predictive factor for the state of bone metabolism. CONCLUSIONS: We conclude that neither the loss of estrogens due to oophorectomy nor their gain due to subsequent hormonal therapy is associated with a specific gut microbiota signature. Sources of variability in microbiota composition are more related to interindividual differences than hormonal status.
- MeSH
- estradiol * MeSH
- estrogeny MeSH
- krček femuru * MeSH
- lidé MeSH
- prospektivní studie MeSH
- RNA ribozomální 16S MeSH
- Check Tag
- lidé MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
BACKGROUND: Ustekinumab, is a new therapy for patients with IBD, especially for patients suffering from Crohn's disease (CD) who did not respond to anti-TNF treatment. To shed light on the longitudinal effect of ustekinumab on the immune system, we investigated the effect on skin and gut microbiota composition, specific immune response to commensals, and various serum biomarkers. METHODOLOGY/PRINCIPAL FINDINGS: We recruited 11 patients with IBD who were monitored over 40 weeks of ustekinumab therapy and 39 healthy controls (HC). We found differences in the concentrations of serum levels of osteoprotegerin, TGF-β1, IL-33, and serum IgM antibodies against Lactobacillus plantarum between patients with IBD and HC. The levels of these biomarkers did not change in response to ustekinumab treatment or with disease improvement during the 40 weeks of observation. Additionally, we identified differences in stool abundance of uncultured Subdoligranulum, Faecalibacterium, and Bacteroides between patients with IBD and HC. CONCLUSION/SIGNIFICANCE: In this preliminary study, we provide a unique overview of the longitudinal monitoring of fecal and skin microbial profiles as well as various serum biomarkers and humoral and cellular response to gut commensals in a small cohort of patients with IBD on ustekinumab therapy.
- MeSH
- biologické markery MeSH
- Crohnova nemoc * terapie MeSH
- inhibitory TNF MeSH
- lidé MeSH
- mikrobiota * MeSH
- pilotní projekty MeSH
- ustekinumab terapeutické užití MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
BACKGROUND AND AIMS: SARS-CoV-2 is a worldwide serious health problem and vaccination seems to have a crucial role in managing the COVID-19 pandemic. The aim of this prospective observational study was to monitor the trend of antibodies against SARS-CoV-2 after vaccination with BNT162b2 (COMIRNATY) in patients with inflammatory bowel disease treated by immunosuppressive and/or biological therapy, demonstrate whether any type of this therapy is associated with poorer production of antibodies against COVID-19 and evaluate the safety of vaccination against COVID-19 in these patients. METHODS: Eighty-seven eligible patients from one tertiary gastroenterological center with inflammatory bowel disease (60 with CD, 27 with UC) treated by immunosuppressive and/or biological therapy from the antiTNFα group were indicated to vaccination against SARS-CoV-2. Effectiveness of vaccination was evaluated by the values of antibodies before and 4 weeks after 2nd dose of vaccine. Additional goal was to evaluate adverse events of vaccination. RESULTS: Before the 2nd dose of vaccine, geometric mean of SARS-CoV-2 IgG antibodies were 40.7 U/ml in the biological therapy group, 34.8 U/ml in the azathioprine group and 44.8 U/ml in the combination therapy group of patients. The geometric means were 676.5.7 U/ml in the biological therapy group, 614.4 U/ml in the azathioprine group and 500.1 U/ml in the combination therapy group of patients four weeks after 2nd dose. Statistically significant differences between these groups were not proved. Several non-severe local and general adverse events were present in our patients with a majority of these events on the day of vaccine administration and the day after, no anaphylactic reactions were present. CONCLUSIONS: Our measurements proved the efficacy and safety of vaccination against SARS-CoV-2 in patients with inflammatory bowel disease treated by immunosuppressive and/or biological therapy. Statistically significant differences between our groups of patients were not proved.
- MeSH
- azathioprin MeSH
- COVID-19 * prevence a kontrola MeSH
- idiopatické střevní záněty * chemicky indukované farmakoterapie MeSH
- lidé MeSH
- pandemie MeSH
- protilátky virové MeSH
- SARS-CoV-2 MeSH
- vakcína BNT162 MeSH
- vakcinace MeSH
- vakcíny proti COVID-19 škodlivé účinky MeSH
- virové vakcíny * MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- pozorovací studie MeSH
- práce podpořená grantem MeSH
OBJECTIVE: The adalimumab biosimilars FKB327 and GP2017 were approved for the therapy of patients with inflammatory bowel disease (IBD). Relatively few prospective studies with biosimilar adalimumab in patients with IBD have been published. The aim of this prospective observational study was to evaluate the effectiveness and safety of the biosimilar adalimumab. MATERIAL AND METHODS: Adalimumab biosimilars FKB327 (Hulio®) and GP2017 (Hyrimoz®) were indicated to 50 naive patients in terms of biological therapy with Crohn's disease (CD) or ulcerative colitis (UC). Effectiveness of therapy was evaluated via the Crohn's Disease Activity Index [CDAI] or the Mayo Scoring System [MSS] in patients with CD or UC, respectively, before and after 12 weeks. Additional goals were to evaluate weight changes, laboratory tests and complications or adverse events of this therapy. RESULTS: In CD patients, remission (CDAI <150) was achieved in 73.5% of cases, partial response (≥70-point decrease in CDAI score from baseline) in 11.8%, no response in 11.8% and 2.9% patients discontinued therapy. In UC patients, remission (total score on partial Mayo index ≤2 points) was achieved only in 18.8% of cases, partial response (≥2-point decrease in partial Mayo score from baseline) in 43.8%, no response in 25.0% and 12.5% patients discontinued therapy. There were statistically significant improvements in CDAI, MSS, haemoglobin, fecal calprotectin, albumin and CRP serum levels after 12 weeks of therapy. Seven adverse events were identified, three of which resulted in therapy being discontinued. CONCLUSIONS: This prospective observational study proved the effectiveness of the adalimumab biosimilars FKB327 and GP2017 in IBD.
- MeSH
- adalimumab škodlivé účinky MeSH
- biosimilární léčivé přípravky * škodlivé účinky MeSH
- Crohnova nemoc * MeSH
- idiopatické střevní záněty * farmakoterapie MeSH
- indukce remise MeSH
- lidé MeSH
- prospektivní studie MeSH
- ulcerózní kolitida * MeSH
- výsledek terapie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- pozorovací studie MeSH
- práce podpořená grantem MeSH
- Publikační typ
- abstrakt z konference MeSH
- Publikační typ
- abstrakt z konference MeSH
