BACKGROUND: Chemotherapy with lomustine is widely considered as standard treatment option for progressive glioblastoma. The value of adding radiotherapy to second-line chemotherapy is not known. METHODS: EORTC-2227-BTG (LEGATO, NCT05904119) is an investigator-initiated, pragmatic (PRECIS-2 score: 34 out of 45), randomized, multicenter phase III trial in patients with first progression of glioblastoma. A total of 411 patients will be randomized in a 1:1 ratio to lomustine (110 mg/m2 every 6 weeks) or lomustine (110 mg/m2 every 6weeks) plus radiotherapy (35 Gy in 10 fractions). Main eligibility criteria include histologic confirmation of glioblastoma, isocitrate dehydrogenase gene (IDH) wild-type per WHO 2021 classification, first progression at least 6 months after the end of prior radiotherapy, radiologically measurable disease according to RANO criteria with a maximum tumor diameter of 5 cm, and WHO performance status of 0-2. The primary efficacy endpoint is overall survival (OS) and secondary endpoints include progression-free survival, response rate, neurocognitive function, health-related quality of life, and health economic parameters. LEGATO is funded by the European Union's Horizon Europe Research program, was activated in March 2024 and will enroll patients in 43 sites in 11 countries across Europe with study completion projected in 2028. DISCUSSION: EORTC-2227-BTG (LEGATO) is a publicly funded pragmatic phase III trial designed to clarify the efficacy of adding reirradiation to chemotherapy with lomustine for the treatment of patients with first progression of glioblastoma. TRIAL REGISTRATION: ClinicalTrials.gov NCT05904119. Registered before start of inclusion, 23 May 2023.

• MeSH
• antitumorózní látky alkylující * terapeutické užití   MeSH
• časové faktory MeSH
• chemoradioterapie metody   MeSH
• doba přežití bez progrese choroby * MeSH
• glioblastom * patologie   farmakoterapie   mortalita   radioterapie   terapie   MeSH
• klinické zkoušky, fáze III jako téma MeSH
• kvalita života MeSH
• lidé MeSH
• lomustin * aplikace a dávkování   terapeutické užití   škodlivé účinky   MeSH
• multicentrické studie jako téma * MeSH
• nádory mozku * radioterapie   patologie   mortalita   terapie   MeSH
• pragmatické klinické studie jako téma MeSH
• progrese nemoci * MeSH
• randomizované kontrolované studie jako téma MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• protokol klinické studie MeSH

It is not well-understood how type 1 diabetes (T1DM) affects skeletal muscle histological phenotype, particularly capillarisation. This study aimed to analyze skeletal muscle myosin heavy chain (MyHC) fibre type changes and 3D capillary network characteristics in experimental T1DM mice. Female C57BL/6J-OlaHsd mice were categorized into streptozotocin (STZ)-induced diabetic (n = 12) and age-matched non-diabetic controls (n =12). The muscle fibre phenotype of the soleus, gluteus maximus, and gastrocnemius muscles were characterized based on the expression of MyHC isoforms, while capillaries of the gluteus maximus were assessed with immunofluorescence staining, confocal laser microscopy and 3D image analysis. STZ-induced diabetic mice exhibited elevated glucose levels, reduced body weight, and prolonged thermal latency, verifying the T1DM phenotype. In both T1DM and non-diabetic mice, the gluteus maximus and gastrocnemius muscles predominantly expressed fast-twitch type 2b fibers, with no significant differences noted. However, the soleus muscle in non-diabetic mice had a greater proportion of type 2a fibers and comparable type 1 fiber densities (26.2 ± 14.6% vs 21.9 ± 13.5%) relative to diabetic mice. T1DM mice showed reduced fiber diameters (P = 0.026), and the 3D capillary network analysis indicated a higher capillary length per muscle volume in the gluteus maximus of diabetic mice compared to controls (P < 0.05). Overall, T1DM induced significant changes in the skeletal muscle, including shifts in MyHC fibre types, decreased fibre diameters, and increased relative capillarisation, possibly due to muscle fibre atrophy. Our findings emphasize the superior detail provided by the 3D analytical method for characterizing skeletal muscle capillary architecture, highlighting caution in interpreting 2D data for capillary changes in T1DM.

• MeSH
• diabetes mellitus 1. typu metabolismus   patologie   MeSH
• experimentální diabetes mellitus * metabolismus   patologie   MeSH
• kapiláry * patologie   metabolismus   MeSH
• kosterní svaly * metabolismus   patologie   krevní zásobení   MeSH
• myši inbrední C57BL MeSH
• myši MeSH
• streptozocin MeSH
• těžké řetězce myosinu * metabolismus   MeSH
• zobrazování trojrozměrné MeSH
• zvířata MeSH
• Check Tag
• myši MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Jako standardní přípravný režim se před podáním autologní transplantace krvetvorných buněk (ASCT) u relabujících či refrakterních lymfomů používal BEAM, tedy carmustine (BCNU) v kombinaci s etoposidem, cytarabinem a melfalanem. Recentní nedostatek BCNU však vedl k nutnosti přechodu na alternativní režim, kterým se v našem centru stal od července 2018 režim obsahující thiotepu, tzv. TEAM. Rozhodli jsme se retrospektivně srovnat gastrointestinální (GIT) toxicitu obou přípravných režimů. Zahrnuli jsme 142 konsekutivně autologně transplantovaných pacientů (BEAM = 82, TEAM = 60), z nichž 31 % mělo difuzní velkobuněčný B-lymfom (DLBCL), 20 % Hodgkinův lymfom (HL), 15 % lymfom z plášťových buněk (MCL), 14 % T-buněčné lymfomy (T-NHL) a zbylých 20 % ostatní druhy non-Hodgkinových lymfomů (NHL). Obě kohorty byly srovnatelné stran věku pacientů, zastoupení diagnóz a stavu nemoci v době ASCT. V distribuci jednotlivých stupňů GIT toxicity nebyl mezi dvěma přípravnými režimy nalezen statisticky signifikantní rozdíl, a to ani po seskupení všech stupňů do dvou hlavních skupin pacientů (grade 0 + 1 vs. grade 2–4). Pacienti dostávající režim TEAM však častěji dospěli k potřebě parenterální výživy, a to ve 20 případech (33 %) oproti pouhým 13 případům (16 %) u režimu BEAM (p = 0,04). Nerelapsová mortalita (NRM) byla u obou režimů srovnatelně nízká, během hospitalizace byla 0 %, ve 3 měsících pak 2 % shodně pro oba přípravné režimy (p = 1,0). Nezaznamenali jsme statisticky signifikantní rozdíl v celkovém přežití (overal survival; OS) ani v přežití do známek progrese (progression free survival; PFS) (p = 0,59 pro OS, p = 0,1 pro PFS).

The BEAM regimen, i.e., carmustine (BCNU) in combination with etoposide, cytarabine, and melphalan was used as standard conditioning prior to autologous hematopoietic cell transplantation (ASCT) in relapsed or refractory lymphomas. However, the recent unavailability of BCNU necessitated the use of an alternative regimen, which in our centre became from July 2018 the so-called TEAM regimen containing thiotepa. We decided to retrospectively compare the gastrointestinal (GIT) toxicity of both conditioning regimens. We included 142 consecutive autologous transplant patients (BEAM = 82, TEAM = 60), of whom 31% had diffuse large B-cell lymphoma (DLBCL), 20% Hodgkin‘s lymphoma (HL), 15 % mantle cell lymphoma (MCL), 14% T-cell lymphomas (T-NHL) and the remaining 20% other types of non-Hodgkin lymphomas (NHL). Both cohorts were comparable in terms of patient age, prevalence of diagnoses, and disease status at the time of ASCT. There was no statistically significant difference in the distribution of the grades of GIT toxicity between the two cohorts, even after grouping all grades into two main groups of patients (grade 0+1 vs. grade 2–4). Patients receiving the TEAM regimen were more likely to require parenteral nutrition, namely in 20 cases (33%) versus only 13 cases (16%) in the BEAM regimen (P = 0.04). Non-relapse mortality (NRM) was comparably low for both regimens – 0% during hospitalization and 2% at 3 months for both conditioning regimens (P = 1.0). We also compared overall survival (OS) and progression-free survival (PFS): there was no statistically significant difference between the two cohorts (P = 0.59 for OS, P = 0.1 for PFS).

• MeSH
• antitumorózní látky škodlivé účinky   terapeutické užití   MeSH
• autologní transplantace MeSH
• dospělí MeSH
• karmustin škodlivé účinky   terapeutické užití   MeSH
• kombinovaná farmakoterapie metody   škodlivé účinky   MeSH
• lidé středního věku MeSH
• lidé MeSH
• lymfom * farmakoterapie   MeSH
• nežádoucí účinky léčiv epidemiologie   MeSH
• příprava pacienta k transplantaci * metody   škodlivé účinky   statistika a číselné údaje   MeSH
• senioři MeSH
• thiotepa škodlivé účinky   terapeutické užití   MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• srovnávací studie MeSH

Diabetes is closely connected with skeletal muscle dysfunction. Ellagic acid (EA) possesses a variety of bio-effects and is applied to the improvement of diabetes. The purpose of this study was to explore the potential improvement effect and mechanisms of EA in streptozotocin (STZ)-induced diabetic muscle atrophy. The model of diabetic mice was established by intra-peritoneal STZ to evaluate treatment effect of EA (100 mg/kg/d for 8 weeks) on muscle atrophy. Our data exhibited that EA enhanced fiber size and weight of gastrocnemius, and promoted grip strength to relieve STZ-induced muscle lesions. In serum, the levels of Creatine kinase (CK), lactate dehydrogenase (LDH), total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol (LDL) were inhibited, while high-density lipoprotein cholesterol (HDL) level was enhanced by EA treatment in diabetic mice. In gastrocnemius, EA decreased Atrogin-1 and MuRF-1 expressions to relieve STZ-induced muscle atrophy. Moreover, EA increased NRF-1 and PGC-1alpha expressions to alleviate mitochondrial disorder. Meanwhile, EA suppressed CHOP and GRP-87 levels to relieve ER stress. Lastly, EA inhibited BAX expressions and enhanced Bcl-2 expressions to mitigate apoptosis. In conclusion, EA is preventing the event of STZ-induced gastrocnemia by amelioration of mitochondrial dysfunction, ER stress and apoptosis, and could be used in the protection and therapeutic of muscle atrophy in diabetes.

• MeSH
• cholesterol metabolismus   MeSH
• experimentální diabetes mellitus * chemicky indukované   komplikace   farmakoterapie   MeSH
• kosterní svaly metabolismus   MeSH
• kyselina ellagová * farmakologie   terapeutické užití   metabolismus   MeSH
• myši MeSH
• streptozocin metabolismus   farmakologie   MeSH
• svalová atrofie farmakoterapie   prevence a kontrola   metabolismus   MeSH
• zvířata MeSH
• Check Tag
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

Diabetes is a chronic metabolic disorder characterized by hyperglycemia and associated with many health complications due to the long-term damage and dysfunction of various organs. A consequential complication of diabetes in men is reproductive dysfunction, reduced fertility, and poor reproductive outcomes. However, the molecular mechanisms responsible for diabetic environment-induced sperm damage and overall decreased reproductive outcomes are not fully established. We evaluated the effects of type 2 diabetes exposure on the reproductive system and the reproductive outcomes of males and their male offspring, using a mouse model. We demonstrate that paternal exposure to type 2 diabetes mediates intergenerational and transgenerational effects on the reproductive health of the offspring, especially on sperm quality, and on metabolic characteristics. Given the transgenerational impairment of reproductive and metabolic parameters through two generations, these changes likely take the form of inherited epigenetic marks through the germline. Our results emphasize the importance of improving metabolic health not only in women of reproductive age, but also in potential fathers, in order to reduce the negative impacts of diabetes on subsequent generations.

• MeSH
• diabetes mellitus 2. typu krev   chemicky indukované   genetika   MeSH
• dieta s vysokým obsahem tuků škodlivé účinky   MeSH
• experimentální diabetes mellitus MeSH
• fenotyp * MeSH
• infertilita krev   chemicky indukované   genetika   MeSH
• myši inbrední C57BL MeSH
• myši MeSH
• paternální dědičnost účinky léků   genetika   MeSH
• spermie účinky léků   fyziologie   MeSH
• streptozocin toxicita   MeSH
• těhotenství MeSH
• zvířata MeSH
• Check Tag
• mužské pohlaví MeSH
• myši MeSH
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

The pathogenesis of Alzheimer's disease (AD), the most prevalent form of dementia, remains unclear. Over the past few years, evidence has accumulated indicating that perturbed cerebral bioenergetics and neuroinflammation may compromise cognitive functions and precedes the onset of AD and that impaired function of glial cells can likely contribute to the development of the disease. Recently, N6-methyladenosine (m6A) modification of RNA has been implicated in the regulation of different processes in the brain and to play a potential role in neurodegeneration. In the present study, we investigated the potential role of the m6A machinery enzymes in a streptozotocin (STZ) model of AD in human astrocytoma CCF-STTG1 cells. We observed that STZ-treated astrocytes expressed significantly higher levels of m6A demethylase fat mass and obesity-associated protein (FTO) and m6A reader YTHDF1 (YTH domain-containing family protein 1). Our experiments revealed that MO-I-500, a novel pharmacological inhibitor of FTO, can strongly reduce the adverse effects of STZ. Inhibition of FTO enhanced the survival of cells exposed to STZ and suppressed oxidative stress, apoptosis, elevated expression of glial fibrillary acidic protein, mitochondrial dysfunction, and bioenergetic disturbances induced by this compound. Overall, the results of this study indicate that perturbed m6A signaling may be contributing to AD pathogenesis, likely by compromising astrocyte bioenergetics.

• MeSH
• adenosin MeSH
• astrocyty * MeSH
• gen pro FTO * MeSH
• lidé MeSH
• mitochondrie MeSH
• streptozocin toxicita   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Animal models are widely used for studying diabetes in translational research. However, methods for induction of diabetes are conflicting with regards to their efficacy, reproducibility and cost. A comparison of outcomes between the diabetic models is still unknown, especially full-term pregnancy.To understand the comparison, we analyzed the streptozotocin (STZ)-induced diabetes at three life-different moments during the neonatal period in Sprague-Dawley female rats: at the first (D1), second (D2) and fifth (D5) day of postnatal life. At adulthood (90 days; D90), the animals were submitted to an oral glucose tolerance test (OGTT) for diabetic status confirmation. The diabetic and control rats were mated and sacrificed at full-term pregnancy for different analyses. Group D1 presented a higher mortality percentage after STZ administration than groups D2 and D5. All diabetic groups presented higher blood glucose levels as compared to those of the control group, while group D5 had higher levels of glycemia compared with other groups during OGTT. The diabetic groups showed impaired reproductive outcomes compared with the control group. Group D1 had lower percentages of mated rats and D5 showed a lower percentage of a full-term pregnancy. Besides that, these two groups also showed the highest percentages of inadequate fetal weight. In summary, although all groups fulfill the diagnosis criteria for diabetes in adult life, in our investigation diabetes induced on D5 presents lower costs and higher efficacy and reproducibility for studies involving diabetes-complicated pregnancy.

• MeSH
• experimentální diabetes mellitus * MeSH
• inzulin MeSH
• krevní glukóza MeSH
• krysa rodu rattus MeSH
• potkani Sprague-Dawley MeSH
• reprodukovatelnost výsledků MeSH
• streptozocin MeSH
• těhotenství MeSH
• zvířata MeSH
• Check Tag
• krysa rodu rattus MeSH
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

The effectiveness of cell transplantation can be improved by optimization of the transplantation site. For some types of cells that form highly oxygen-demanding tissue, e.g., pancreatic islets, a successful engraftment depends on immediate and sufficient blood supply. This critical point can be avoided when cells are transplanted into a bioengineered pre-vascularized cavity which can be formed using a polymer scaffold. In our study, we tested surface-modified poly(lactide-co-caprolactone) (PLCL) capsular scaffolds containing the pro-angiogenic factor VEGF. After each modification step (i.e., amination and heparinization), the surface properties and morphology of scaffolds were characterized by ATR-FTIR and XPS spectroscopy, and by SEM and AFM. All modifications preserved the gross capsule morphology and maintained the open pore structure. Optimized aminolysis conditions decreased the Mw of PLCL only up to 10% while generating a sufficient number of NH2 groups required for the covalent immobilization of heparin. The heparin layer served as a VEGF reservoir with an in vitro VEGF release for at least four weeks. In vivo studies revealed that to obtain highly vascularized PLCL capsules (a) the optimal VEGF dose for the capsule was 50 μg and (b) the implantation time was four weeks when implanted into the greater omentum of Lewis rats; dense fibrous tissue accompanied by vessels completely infiltrated the scaffold and created sparse granulation tissue within the internal cavity of the capsule. The prepared pre-vascularized pouch enabled the islet graft survival and functioning for at least 50 days after islet transplantation. The proposed construct can be used to create a reliable pre-vascularized pouch for cell transplantation.

• MeSH
• bioinženýrství * MeSH
• experimentální diabetes mellitus chemicky indukované   metabolismus   patologie   MeSH
• fyziologická neovaskularizace * MeSH
• injekce intraperitoneální MeSH
• krevní glukóza analýza   MeSH
• krysa rodu rattus MeSH
• molekulární struktura MeSH
• polyestery chemie   metabolismus   MeSH
• potkani inbrední LEW MeSH
• streptozocin aplikace a dávkování   MeSH
• tobolky chemie   metabolismus   MeSH
• transplantace Langerhansových ostrůvků * MeSH
• vaskulární endoteliální růstové faktory chemie   metabolismus   MeSH
• velikost částic MeSH
• zvířata MeSH
• Check Tag
• krysa rodu rattus MeSH
• mužské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

The aqueous extract of Cichorium intybus (CIE) leaves have shown the properties of protecting against pancreatic β-cell damage by streptozotocin (STZ), but the molecular mechanisms of its protection are not completely elucidated yet. Our current study focuses on elucidating the mechanisms of these preventive effects of CIE in MIN6 cells and an in-vivo model of Wistar rats. CIE offers protection against STZ in MIN6 cells by reducing the pro-oxidants and increasing the activity of the antioxidant enzymes. In vitro results also indicated that CIE inhibited cytotoxicity, reduced Reactive oxygen species (ROS), maintained glucose-stimulated insulin secretion and reduced NF-κB p65 translocation into the nucleus. The group administered with a 250 mg/kg dose of CIE in vivo has shown an ability to maintain blood glucose level and also to preserve the number and morphology of pancreatic islets when compared to the diabetic group treated with STZ. Probably, active compounds like quercetin, rutin, and catechin present in CIE, preserve the integrity of pancreatic islets thereby protecting β-cells from the adverse effects of STZ.

• MeSH
• čekanka obecná * chemie   metabolismus   účinky léků   MeSH
• diabetes mellitus chemicky indukované   MeSH
• krysa rodu rattus MeSH
• ochranné faktory MeSH
• streptozocin * farmakologie   škodlivé účinky   toxicita   MeSH
• zvířata MeSH
• Check Tag
• krysa rodu rattus MeSH
• zvířata MeSH
• Publikační typ
• hodnotící studie MeSH

Beta-hydroxy-beta-methyl butyrate (HMB) is a unique product of leucine catabolism with positive effects on protein balance. We have examined the effects of HMB (200 mg/kg/day via osmotic pump for 7 days) on rats with diabetes induced by streptozotocin (STZ, 100 mg/kg intraperitoneally). STZ induced severe diabetes associated with muscle wasting, decreased ATP in the liver, and increased α-ketoglutarate in muscles. In plasma, liver, and muscles increased branched-chain amino acids (BCAAs; valine, isoleucine, and leucine) and decreased serine. The decreases in mass and protein content of muscles and increases in BCAA concentration were more pronounced in extensor digitorum longus (fast-twitch muscle) than in soleus muscle (slow-twitch muscle). HMB infusion to STZ-treated animals increased glycemia and serine in the liver, decreased BCAAs in plasma and muscles, and decreased ATP in the liver and muscles. The effects of HMB on the weight and protein content of tissues were nonsignificant. We concluded that fast-twitch muscles are more sensitive to STZ than slow-twitch muscles and that HMB administration to STZ-treated rats has dual effects. Adjustments of BCAA concentrations in plasma and muscles and serine in the liver can be considered beneficial, whereas the increased glycemia and decreased ATP concentrations in the liver and muscles are detrimental.

• MeSH
• aminokyseliny aplikace a dávkování   farmakologie   MeSH
• diabetes mellitus 1. typu chemicky indukované   farmakoterapie   metabolismus   MeSH
• injekce intraperitoneální MeSH
• injekce subkutánní MeSH
• játra účinky léků   metabolismus   MeSH
• kosterní svaly účinky léků   metabolismus   MeSH
• krysa rodu rattus MeSH
• potkani Wistar MeSH
• streptozocin aplikace a dávkování   MeSH
• valeráty aplikace a dávkování   farmakologie   MeSH
• zvířata MeSH
• Check Tag
• krysa rodu rattus MeSH
• mužské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH