PI3K signaling pathway is crucial for a plethora of cellular processes and is extensively linked with tumorigenesis and chemo-/radioresistance. Although a number of small molecule inhibitors have been synthesized to control PI3K-mediated signaling, only a limited clinical success has been reached. Thus, the search for novel promising candidates is still ongoing. Herein, we present a novel series of N-(5-(2-morpholino-4-oxo-3,4-dihydroquinazolin-8-yl)pyridin-2-yl)acylamides designed to simultaneously inhibit PI3K and DNA-PK activity. Compared to a commercial DNA-PK/PI3K inhibitor AZD7648, synthesized compounds generally exhibited markedly lower baseline cytotoxicity in all tested cell lines (MC38, B16F10, 4T1, CT26 and HEK-239). Through an array of biological experiments, we selected two most promising compounds, 2 and 6. While in cell-free conditions, 6 acted as a very efficient pan-PI3K and DNA-PK inhibitor, in physiological conditions, 2 performed better and acted as a potent chemosensitizer able to increase the amount of DNA double strand breaks induced by doxorubicin. This was plausibly due to its improved ability to accumulate in nuclei as evidenced by confocal analyses. Importantly, using P-gp overexpressing CT26 cells, we found that 2 is an efficient inhibitor of multidrug resistance (MDR) able to down-regulate expression of mRNA encoding MDR-driving proteins ABCB1A, ABCB1B and ABCC1. We also demonstrate that 2 can be simply loaded into lipid nanoparticles that retain its chemosensitizing properties. Taken together, the presented study provides a solid basis for a subsequent rational structure optimization towards new generation of multitarget inhibitors able to control crucial signaling pathways involved in tumorigenesis and drug resistance.

• Klíčová slova
• Chemosensitization, DNA-Dependent protein kinase, Doxorubicin, Drug delivery, Multitarget inhibition, Phoshphoinositide-3-kinases inhibitors, Resistance,
• MeSH
• chemorezistence * účinky léků   MeSH
• fosfatidylinositol-3-kinasy metabolismus   MeSH
• inhibitory fosfoinositid-3-kinasy * farmakologie   MeSH
• inhibitory proteinkinas * farmakologie   chemie   chemická syntéza   MeSH
• lidé MeSH
• mnohočetná léková rezistence * účinky léků   MeSH
• molekulární struktura MeSH
• myši MeSH
• nádorové buněčné linie MeSH
• P-glykoprotein * antagonisté a inhibitory   metabolismus   MeSH
• proliferace buněk účinky léků   MeSH
• proteinkinasa aktivovaná DNA * antagonisté a inhibitory   metabolismus   MeSH
• protinádorové látky * farmakologie   chemie   chemická syntéza   MeSH
• screeningové testy protinádorových léčiv MeSH
• vztah mezi dávkou a účinkem léčiva MeSH
• vztahy mezi strukturou a aktivitou MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• fosfatidylinositol-3-kinasy MeSH
• inhibitory fosfoinositid-3-kinasy * MeSH
• inhibitory proteinkinas * MeSH
• P-glykoprotein * MeSH
• proteinkinasa aktivovaná DNA * MeSH
• protinádorové látky * MeSH

BACKGROUND: As highlighted by recent pandemic outbreaks, antiviral drugs are crucial resources in the global battle against viral diseases. Unfortunately, most antiviral drugs are characterized by a plethora of side effects and low efficiency/poor bioavailability owing to their insolubility. This also applies to the arylnaphthalide lignin family member, diphyllin (Diph). Diph acts as a vacuolar ATPase inhibitor and has been previously identified as a promising candidate with broad-spectrum antiviral activity. However, its physicochemical properties preclude its efficient administration in vivo, complicating preclinical testing. METHODS: We produced human recombinant H- ferritin (HsaFtH) and used it as a delivery vehicle for Diph encapsulation through pH-mediated reversible reassembly of HsaFtH. Diph nanoformulation was subsequently thoroughly characterized and tested for its non-target cytotoxicity and antiviral efficiency using a panel of pathogenic viral strain. RESULTS: We revealed that loading into HsaFtH decreased the undesired cytotoxicity of Diph in mammalian host cells. We also confirmed that encapsulated Diph exhibited slightly lower antiviral activity than free Diph, which may be due to the differential uptake mechanism and kinetics of free Diph and Diph@HsaFtH. Furthermore, we confirmed that the antiviral effect was mediated solely by Diph with no contribution from HsaFtH. CONCLUSION: It was confirmed that HsaFtH is a suitable vehicle that allows easy loading of Diph and production of highly homogeneous nanoparticles dispersion with promising broad-spectrum antiviral activity.

• Klíčová slova
• SARS-CoV-2, TBEV, WNV, Zika virus, drug delivery,
• MeSH
• antivirové látky * farmakologie   chemie   farmakokinetika   MeSH
• hydrofobní a hydrofilní interakce MeSH
• lidé MeSH
• lignany * MeSH
• nanočástice chemie   MeSH
• rekombinantní proteiny chemie   MeSH
• vakuolární protonové ATPasy antagonisté a inhibitory   metabolismus   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• antivirové látky * MeSH
• diphyllin MeSH Prohlížeč
• lignany * MeSH
• rekombinantní proteiny MeSH
• vakuolární protonové ATPasy MeSH

Ferritins are globular proteins with an internal cavity that enables the encapsulation of a plethora of low-mass compounds. Unfortunately, the overall negative surface charge of ferritin's internal cavity hampers efficient loading of negatively charged molecules. Therefore, we produced a genetically engineered human H-chain ferritin containing a cationic RKRK domain, reversing the natural net charge of the cavity to positive, thus allowing for efficient encapsulation of negatively charged siRNA. Due to the reversed, positive charge mediated by RKRK domains, the recombinant ferritin produced in E. coli inherently carries a load of bacterial RNA inside its cavity, turning the protein into an effective sponge possessing high affinity for DNA/RNA-binding substances that can be loaded with markedly higher efficiency compared to the wildtype protein. Using doxorubicin as payload, we show that due to its loading through the RNA sponge, doxorubicin is released in a sustained manner, with a cytotoxicity profile similar to the free drug. In summary, this is the first report demonstrating a ferritin/nucleic acid hybrid delivery vehicle with a broad spectrum of properties exploitable in various fields of biomedical applications.

• MeSH
• apoferritiny * genetika   MeSH
• doxorubicin farmakologie   chemie   MeSH
• Escherichia coli genetika   metabolismus   MeSH
• ferritiny genetika   chemie   MeSH
• lidé MeSH
• RNA * MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• apoferritiny * MeSH
• doxorubicin MeSH
• ferritiny MeSH
• RNA * MeSH

The BODIPY-labelled oxime reactivator was prepared and used to study its biodistribution into central nervous system. The newly synthesized oxime was found to be weak inhibitor of acetylcholinesterase and strong inhibitor of butyrylcholinesterase. Its reactivation ability for organophosphate inhibited acetylcholinesterase was found similar to a parent oxime. The BODIPY-labelled oxime was further encapsulated into recombinant human H-ferritin and evaluated in vitro and in vivo. The oxime or encapsulated oxime were found to be bioaccumulated primarily in liver and kidneys of mice, but some amount was distributed also to the brain, where it was detectable even after 24 h. The BODIPY-labelled oxime encapsulated to human H-ferritin showed better CNS bioaccumulation and tissue retention at 8 and 24 h time points compared to free oxime, although the fluorescence results might be biased due to BODIPY metabolites identified in tissue homogenates. Taken together, the study demonstrates the first utilization of recombinant ferritins for changing the unfavourable pharmacokinetics of oxime reactivators and brings promising results for follow-up studies.

• Klíčová slova
• BODIPY, Cholinesterase, Encapsulation, Organophosphate, Oxime, Reactivation,
• Publikační typ
• časopisecké články MeSH

Single-benzene fluorophores are bright and the smallest fluorochromes known so far. In single-benzene fluorophores, the fluorescence is mediated by the push/pull effect of substituting groups. Despite a plethora of advantageous properties, this group of molecules has not been extensively studied for design of high-performance fluorescent sensors of catalytic or enzymatic activities. Thus, herein, new fluorescent probes based on the Tsuji-Trost reaction were developed for the selective detection of palladium and other transition metals (platinum and gold) in an aqueous/organic mixed solvent with the sensitivity down to 2.5 nM (for palladium). The relative flexibility in the synthesis of these probes allows for facile color tuning of the emitted fluorescence. In this study, we have successfully utilized a yellow emission variant for sensitive detection of palladium under cell-free conditions and in living cells, validating its possible applicability for high-throughput optical sensing of catalysts for bioorthogonal chemistry under physiological conditions.

• MeSH
• benzen MeSH
• fluorescenční barviva chemie   MeSH
• palladium * chemie   MeSH
• přechodné kovy * MeSH
• rozpouštědla MeSH
• viabilita buněk MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• benzen MeSH
• fluorescenční barviva MeSH
• palladium * MeSH
• přechodné kovy * MeSH
• rozpouštědla MeSH

Perinatal exposure to Δ9-tetrahydrocannabinol (THC) affects brain development and might increase the incidence of psychopathology later in life, which seems to be related to a dysregulation of endocannabinoid and/or dopaminergic systems. We here evaluated the transcriptional regulation of the genes encoding for the cannabinoid CB1 receptor (Cnr1) and the dopamine D2 receptor (Drd2) in perinatal THC-(pTHC) exposed male rats, focusing on the role of DNA methylation analyzed by pyrosequencing. Simultaneously, the molecular and behavioral abnormalities at two different time points (i.e., neonatal age and adulthood) and the potential preventive effect of peripubertal treatment with cannabidiol, a non-euphoric component of Cannabis, were assessed. The DRD2 methylation was also evaluated in a cohort of subjects with schizophrenia. We observed an increase in both Cnr1 and Drd2 mRNA levels selectively in the prefrontal cortex of adult pTHC-exposed rats with a consistent reduction in DNA methylation at the Drd2 regulatory region, paralleled by social withdrawal and cognitive impairment which were reversed by cannabidiol treatment. These adult abnormalities were preceded at neonatal age by delayed appearance of neonatal reflexes, higher Drd2 mRNA and lower 2-arachidonoylglycerol (2-AG) brain levels, which persisted till adulthood. Alterations of the epigenetic mark for DRD2 were also found in subjects with schizophrenia. Overall, reported data add further evidence to the dopamine-cannabinoid interaction in terms of DRD2 and CNR1 dysregulation which could be implicated in the pathogenesis of schizophrenia spectrum disorders, suggesting that cannabidiol treatment may normalize pTHC-induced psychopathology by modulating the altered dopaminergic activity.

• Klíčová slova
• Cannabidiol, Cannabinoid CB1 receptor, DNA methylation, Dopamine D2 receptor, Epigenetics, Schizophrenia, THC,
• MeSH
• chování zvířat účinky léků   MeSH
• krysa rodu Rattus MeSH
• lidé MeSH
• maternofetální výměna látek MeSH
• messenger RNA metabolismus   MeSH
• metylace DNA účinky léků   MeSH
• potkani Sprague-Dawley MeSH
• prefrontální mozková kůra účinky léků   metabolismus   MeSH
• receptor kanabinoidní CB1 genetika   MeSH
• receptory dopaminu D2 genetika   MeSH
• regulace genové exprese účinky léků   MeSH
• schizofrenie genetika   MeSH
• těhotenství MeSH
• tetrahydrokanabinol farmakologie   MeSH
• zpožděný efekt prenatální expozice * MeSH
• zvířata MeSH
• Check Tag
• krysa rodu Rattus MeSH
• lidé MeSH
• mužské pohlaví MeSH
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• messenger RNA MeSH
• receptor kanabinoidní CB1 MeSH
• receptory dopaminu D2 MeSH
• tetrahydrokanabinol MeSH

Allyl- and propargyl ethers of umbelliferone are sensitive probes for palladium and platinum, including anticancer compounds cisplatin, carboplatin and oxaliplatin, and effective for direct visualization of protein and DNA complexes with organometallic compounds in polyacrylamide gels allowing easy detection of interactions with analyzed protein or nucleic acid. Both probes can be used for fast evaluation of Pd/Pt binding to nanocarriers relevant in drug targeted therapy or specific clinically relevant target macromolecules.

• MeSH
• akrylové pryskyřice MeSH
• DNA chemie   MeSH
• organoplatinové sloučeniny chemie   MeSH
• palladium chemie   MeSH
• platina chemie   MeSH
• proteiny chemie   MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• akrylové pryskyřice MeSH
• DNA MeSH
• organoplatinové sloučeniny MeSH
• palladium MeSH
• platina MeSH
• polyacrylamide gels MeSH Prohlížeč
• proteiny MeSH

Gestational methylazoxymethanol acetate (MAM) treatment produces offspring with adult phenotype relevant to schizophrenia, including positive- and negative-like symptoms, cognitive deficits, dopaminergic dysfunction, structural and functional abnormalities. Here we show that adult rats prenatally treated with MAM at gestational day 17 display significant increase in dopamine D3 receptor (D3) mRNA expression in prefrontal cortex (PFC), hippocampus and nucleus accumbens, accompanied by increased expression of dopamine D2 receptor (D2) mRNA exclusively in the PFC. Furthermore, a significant change in the blood perfusion at the level of the circle of Willis and hippocampus, paralleled by the enlargement of lateral ventricles, was also detected by magnetic resonance imaging (MRI) techniques. Peripubertal treatment with the non-euphoric phytocannabinoid cannabidiol (30 mg/kg) from postnatal day (PND) 19 to PND 39 was able to reverse in MAM exposed rats: i) the up-regulation of the dopamine D3 receptor mRNA (only partially prevented by haloperidol 0.6 mg/kg/day); and ii) the regional blood flow changes in MAM exposed rats. Molecular modelling predicted that cannabidiol could bind preferentially to dopamine D3 receptor, where it may act as a partial agonist according to conformation of ionic-lock, which is highly conserved in GPCRs. In summary, our results demonstrate that the mRNA expression of both dopamine D2 and D3 receptors is altered in the MAM model; however only the transcript levels of D3 are affected by cannabidiol treatment, likely suggesting that this gene might not only contribute to the schizophrenia symptoms but also represent an unexplored target for the antipsychotic activity of cannabidiol.

• Klíčová slova
• Arterial Spine Labelling, Cannabidiol, Dopamine D3 receptor, MAM model, Molecular Dynamics, Schizophrenia,
• MeSH
• antipsychotika farmakologie   MeSH
• haloperidol chemie   farmakologie   MeSH
• kanabidiol chemie   farmakologie   MeSH
• magnetická rezonanční tomografie MeSH
• methylazoxymethanolacetát toxicita   MeSH
• modely nemocí na zvířatech MeSH
• molekulární modely MeSH
• mozek diagnostické zobrazování   účinky léků   MeSH
• mozkový krevní oběh MeSH
• potkani Sprague-Dawley MeSH
• puberta MeSH
• receptory dopaminu D2 chemie   genetika   metabolismus   MeSH
• receptory dopaminu D3 chemie   genetika   metabolismus   MeSH
• regulace genové exprese MeSH
• schizofrenie chemicky indukované   diagnostické zobrazování   farmakoterapie   genetika   MeSH
• simulace molekulární dynamiky MeSH
• těhotenství MeSH
• zpožděný efekt prenatální expozice MeSH
• zvířata MeSH
• Check Tag
• mužské pohlaví MeSH
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• antipsychotika MeSH
• DRD2 protein, mouse MeSH Prohlížeč
• haloperidol MeSH
• kanabidiol MeSH
• methylazoxymethanolacetát MeSH
• receptory dopaminu D2 MeSH
• receptory dopaminu D3 MeSH

Nanoparticular form of titanium dioxide (TiO2 NPs) belongs to important industrial material. Despite being widely used, serious contradictions regarding biosafety of TiO2 NPs remain. We anticipate that such discrepancies could be due to a lack of understanding of a linkage between TiO2 NPs phase composition and cytotoxicity. Therefore, we synthesized two types of biphasic TiO2 NPs differing in an anatase-brookite phase composition. The study presents an array of in vitro data suggesting that TiO2 NPs with a prevailing anatase phase composition possess higher cytotoxicity compared to TiO2 NPs with an equal anatase-brookite crystallinity. This phenomenon was evidenced by significantly higher inhibition of metabolic activity and growth of epithelial and neuroblast-like cells. Moreover, anatase-prevailing TiO2 NPs tend to produce higher amount of reactive oxygen species resulting in DNA fragmentation. Further insights into the molecular aspects of cytotoxicity of anatase-prevailing TiO2 NPs were obtained by comparative proteomics delineating that TiO2 NPs deregulate expression of a variety of proteins and associated pathways. This inevitably results in a decreased cellular ability to detoxify reactive oxygen species and respond to various stress conditions. The study provides novel data that add another piece to the jigsaw of the relation between structural features of NPs and biosafety.

• Klíčová slova
• Cytotoxicity, Nanotoxicology, Oxidative stress, Proteomics, Titanium,
• MeSH
• buněčné linie MeSH
• epitelové buňky účinky léků   metabolismus   MeSH
• kovové nanočástice chemie   toxicita   ultrastruktura   MeSH
• krystalografie rentgenová MeSH
• lidé MeSH
• nádorové buněčné linie MeSH
• oxidační stres * MeSH
• reaktivní formy kyslíku metabolismus   MeSH
• titan chemie   toxicita   MeSH
• transmisní elektronová mikroskopie MeSH
• viabilita buněk účinky léků   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• reaktivní formy kyslíku MeSH
• titan MeSH
• titanium dioxide MeSH Prohlížeč

In agreement with the neurodevelopmental hypothesis of schizophrenia, prenatal exposure of rats to the antimitotic agent methylazoxymethanol acetate (MAM) at gestational day 17 produced long-lasting behavioral alterations such as social withdrawal and cognitive impairment in the social interaction test and in the novel object recognition test, respectively. At the molecular level, an increased cannabinoid receptor type-1 (CB1) mRNA and protein expression, which might be due to reduction in DNA methylation at the gene promoter in the prefrontal cortex (PFC), coincided with deficits in the social interaction test and in the novel object recognition test in MAM rats. Both the schizophrenia-like phenotype and altered transcriptional regulation of CB1 receptors were reversed by peripubertal treatment (from PND 19 to PND 39) with the non-psychotropic phytocannabinoid cannabidiol (30 mg/kg/day), or, in part, by treatment with the cannabinoid CB1 receptor antagonist/inverse agonist AM251 (0.5 mg/kg/day), but not with haloperidol (0.6 mg/kg/day). These results suggest that early treatment with cannabidiol may prevent both the appearance of schizophrenia-like deficits as well as CB1 alterations in the PFC at adulthood, supporting that peripubertal cannabidiol treatment might be protective against MAM insult.

• Klíčová slova
• Cannabidiol, Cannabinoid CB1 receptor, MAM model, Schizophrenia,
• MeSH
• amidy MeSH
• endokanabinoidy metabolismus   MeSH
• ethanolaminy metabolismus   MeSH
• glyceridy metabolismus   MeSH
• hipokampus metabolismus   MeSH
• interpersonální vztahy MeSH
• kanabidiol farmakologie   MeSH
• krysa rodu Rattus MeSH
• kyseliny arachidonové metabolismus   MeSH
• kyseliny olejové metabolismus   MeSH
• kyseliny palmitové metabolismus   MeSH
• messenger RNA metabolismus   MeSH
• methylazoxymethanolacetát farmakologie   MeSH
• modely nemocí na zvířatech MeSH
• piperidiny farmakologie   MeSH
• pohybová aktivita účinky léků   MeSH
• polynenasycené alkamidy metabolismus   MeSH
• prefrontální mozková kůra metabolismus   MeSH
• puberta MeSH
• pyrazoly farmakologie   MeSH
• receptor kanabinoidní CB1 metabolismus   MeSH
• rozpoznávání (psychologie) účinky léků   MeSH
• schizofrenie chemicky indukované   farmakoterapie   metabolismus   MeSH
• těhotenství MeSH
• zpožděný efekt prenatální expozice farmakoterapie   metabolismus   MeSH
• zvířata MeSH
• Check Tag
• krysa rodu Rattus MeSH
• mužské pohlaví MeSH
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• AM 251 MeSH Prohlížeč
• amidy MeSH
• anandamide MeSH Prohlížeč
• endokanabinoidy MeSH
• ethanolaminy MeSH
• glyceridy MeSH
• glyceryl 2-arachidonate MeSH Prohlížeč
• kanabidiol MeSH
• kyseliny arachidonové MeSH
• kyseliny olejové MeSH
• kyseliny palmitové MeSH
• messenger RNA MeSH
• methylazoxymethanolacetát MeSH
• N-oleoylethanolamine MeSH Prohlížeč
• palmidrol MeSH Prohlížeč
• piperidiny MeSH
• polynenasycené alkamidy MeSH
• pyrazoly MeSH
• receptor kanabinoidní CB1 MeSH