Drug resistance is a growing problem for many pathogens, including mycobacteria. Small heterocyclic molecules are among the leading scaffolds for developing potential antimycobacterial agents. Therefore, based on the molecular hybridization approach, we have prepared an extensive series of N-substituted 5-(3,5-dinitrophenyl)-1,3,4-oxadiazol-2-amine derivatives. We also investigated their isosteres and acyclic synthetic precursors. The compounds were evaluated for their in vitro activity against Mycobacterium tuberculosis (Mtb) H37Rv, a panel of multidrug- and extensively drug-resistant Mtb isolates and two nontuberculous mycobacterial strains (NTM; M. avium and M. kansasii). The ability to inhibit mycobacterial growth was quantified using minimum inhibitory concentration (MIC) values. Many compounds achieved MIC values ≤ 0.03 μM for NTM and Mtb, regardless of their resistance profile. The highest activity was associated with oxadiazole and thiadiazole scaffolds with benzylamino or C5-C9 alkylamino substitution. The experimentally confirmed mechanism of action of these compounds consists of disruption of mycobacterial cell wall biosynthesis via inhibition of decaprenylphosphoryl-β-D-ribose 2'-epimerase (DprE1). In vitro toxicity evaluation was performed in a hepatocyte model (HepG2), while in vivo toxicity was evaluated using Danio rerio embryos. These findings identify a promising new chemotype with potent, broad-spectrum and selective antimycobacterial activity, including efficacy against resistant strains, and support its further development as a potential therapeutic candidate.

• MeSH
• antituberkulotika * farmakologie   chemická syntéza   chemie   toxicita   MeSH
• dánio pruhované MeSH
• lidé MeSH
• mikrobiální testy citlivosti MeSH
• Mycobacterium tuberculosis účinky léků   MeSH
• oxadiazoly * farmakologie   chemická syntéza   chemie   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

3,5-Dinitrobenzylsulfanyl tetrazoles and 1,3,4-oxadiazoles, previously identified as having high in vitro activities against both replicating and nonreplicating mycobacteria and favorable cytotoxicity and genotoxicity profiles were investigated. First we demonstrated that these compounds act in a deazaflavin-dependent nitroreduction pathway and thus require a nitro group for their activity. Second, we confirmed the necessity of both nitro groups for antimycobacterial activity through extensive structure-activity relationship studies using 32 structural types of analogues, each in a five-membered series. Only the analogues with shifted nitro groups, namely, 2,5-dinitrobenzylsulfanyl oxadiazoles and tetrazoles, maintained high antimycobacterial activity but in this case mainly as a result of DprE1 inhibition. However, these analogues also showed increased toxicity to the mammalian cell line. Thus, both nitro groups in 3,5-dinitrobenzylsulfanyl-containing antimycobacterial agents remain essential for their high efficacy, and further efforts should be directed at finding ways to address the possible toxicity and solubility issues, for example, by targeted delivery.

• MeSH
• antituberkulotika farmakologie   chemie   MeSH
• mikrobiální testy citlivosti MeSH
• Mycobacterium tuberculosis * MeSH
• nitroreduktasy MeSH
• oxadiazoly farmakologie   chemie   MeSH
• savci MeSH
• tetrazoly farmakologie   chemie   MeSH
• vztahy mezi strukturou a aktivitou MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

BACKGROUND: Monoamine oxidase (MAO) inhibitors can interact with selective serotonin reuptake inhibitors (SSRIs)/serotonin-norepinephrine reuptake inhibitors (SNRIs). There is clinical interest surrounding use of ozanimod with SSRIs/SNRIs because the major metabolites of ozanimod are weak inhibitors of MAO-B in vitro. OBJECTIVE: To evaluate the incidence of treatment-emergent adverse events (TEAEs) potentially related to serotonin accumulation (SA) during concomitant ozanimod and SSRI/SNRI use by performing analyses of data from an open-label, oral ozanimod 0.92 mg trial (DAYBREAK; NCT02576717). METHODS: SA narrow (serotonin syndrome, neuroleptic malignant syndrome, and hyperthermia malignant) and broad (terms potentially associated with SA) MedDRA v24.0 searches were performed using TEAE data from participants with relapsing multiple sclerosis who entered DAYBREAK from phase 3 studies (cutoff February 1, 2022). Incidences of TEAEs matching terms from each search were stratified by SSRI/SNRI use. RESULTS: Of 2257 DAYBREAK participants, 274 (12.1%) used an SSRI/SNRI. No participants had TEAEs matching the SA narrow search terms. There was no significant difference in the percentage of participants with ⩾1 TEAE matching the SA broad search for those on versus off SSRIs/SNRIs (on: 12.4%, n = 34/274; off: 15.6%, n = 310/1982, nominal p = 0.1630). CONCLUSION: MedDRA searches showed no increase in TEAEs potentially associated with SA with concomitant SSRI/SNRI and ozanimod use.

• MeSH
• antidepresiva škodlivé účinky   MeSH
• indany * MeSH
• inhibitory zpětného vychytávání serotoninu a noradrenalinu * škodlivé účinky   MeSH
• lidé MeSH
• oxadiazoly * MeSH
• roztroušená skleróza * chemicky indukované   MeSH
• selektivní inhibitory zpětného vychytávání serotoninu škodlivé účinky   MeSH
• serotonin MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

The cardioprotective effect of ischemic preconditioning (IPC) and ischemic postconditioning (IPoC) in adult hearts is mediated by nitric oxide (NO). During the early developmental period, rat hearts exhibit higher resistance to ischemia-reperfusion (I/R) injury, contain higher levels of serum nitrates, and their resistance cannot be further increased by IPC or IPoC. NOS blocker (L-NAME) lowers their high resistance. Wistar rat hearts (postnatal Days 1 and 10) were perfused according to Langendorff and exposed to 40 min of global ischemia followed by reperfusion with or without IPoC. NO and reactive oxygen species donors (DEA-NONO, SIN-1) and L-NAME were administered. Tolerance to ischemia decreased between Days 1 and 10. DEA-NONO (low concentrations) significantly increased tolerance to I/R injury on both Days 1 and 10. SIN-1 increased tolerance to I/R injury on Day 10, but not on Day 1. L-NAME significantly reduced resistance to I/R injury on Day 1, but actually increased resistance to I/R injury on Day 10. Cardioprotection by IPoC on Day 10 was not affected by either NO donors or L-NAME. It can be concluded that resistance of the neonatal heart to I/R injury is NO dependent, but unlike in adult hearts, cardioprotective interventions, such as IPoC, are most likely NO independent.

• MeSH
• donory oxidu dusnatého farmakologie   MeSH
• ischemické přivykání metody   MeSH
• ischemický postconditioning * metody   MeSH
• krysa rodu rattus MeSH
• molsidomin farmakologie   analogy a deriváty   MeSH
• myokard metabolismus   MeSH
• NG-nitroargininmethylester * farmakologie   MeSH
• novorozená zvířata * MeSH
• oxid dusnatý * metabolismus   MeSH
• potkani Wistar * MeSH
• reperfuzní poškození myokardu * prevence a kontrola   metabolismus   MeSH
• srdce účinky léků   MeSH
• zvířata MeSH
• Check Tag
• krysa rodu rattus MeSH
• mužské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

• Klíčová slova
• ataluren,
• MeSH
• dítě MeSH
• dostupnost zdravotnických služeb MeSH
• Duchennova muskulární dystrofie * ekonomika   farmakoterapie   terapie   MeSH
• lidé MeSH
• oxadiazoly terapeutické užití   MeSH
• schvalování léčiv * MeSH
• služby domácí péče organizace a řízení   MeSH
• Check Tag
• dítě MeSH
• lidé MeSH
• mužské pohlaví MeSH
• Publikační typ
• novinové články MeSH

BACKGROUND: This paper details the results of an evaluation of the level of consensus amongst clinicians on the use of ataluren in both ambulatory and non-ambulatory patients with nonsense mutation Duchenne muscular dystrophy (nmDMD). The consensus was derived using a modified Delphi methodology that involved an exploration phase and then an evaluation phase. METHODS: The exploration phase involved 90-minute virtual 1:1 interviews of 12 paediatric neurologists who cared for 30-120 DMD patients each and had patient contact every one or two weeks. The respondents managed one to ten nmDMD patients taking ataluren. The Discussion Guide for the interviews can be viewed as Appendix A. Following the exploration phase interviews, the interview transcripts were analysed by an independent party to identify common themes, views and opinions and developed 43 draft statements that the Steering Group (authors) reviewed, refined and endorsed a final list of 42 statements. Details of the recruitment of participants for the exploration and evaluation phases can be found under the Methods section. RESULTS: A consensus was agreed (> 66% of respondents agreeing) for 41 of the 42 statements using results from a consensus survey of healthcare professionals (n = 20) experienced in the treatment of nmDMD. CONCLUSIONS: The statements with a high consensus suggest that treatment with ataluren should be initiated as soon as possible to delay disease progression and allow patients to remain ambulatory for as long as possible. Ataluren is indicated for the treatment of Duchenne muscular dystrophy that results from a nonsense mutation in the dystrophin gene, in ambulatory patients aged 2 years and older (see Summary of Product Characteristics for each country).

• MeSH
• dítě MeSH
• Duchennova muskulární dystrofie * genetika   terapie   MeSH
• dystrofin genetika   MeSH
• konsensus MeSH
• lidé MeSH
• nesmyslný kodon MeSH
• oxadiazoly * MeSH
• Check Tag
• dítě MeSH
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Izrael MeSH
• Řecko MeSH
• Švédsko MeSH
• východní Evropa MeSH

Za poslední dekády se scénář léčby roztroušené sklerózy (RS) radikálně změnil. Rostoucí dostupnost účinné terapie modifikující chorobu (DMT) posunula terapeutické cíle od snížení počtu relapsů a nárůstu invalidity až k absenci známek aktivity onemocnění jak klinických, tak na magnetické rezonanci. Volba terapie je stále složitější a měla by se řídit odpovídajícími znalostmi mechanismu účinku jednotlivých léků, účinností a jejich bezpečnostním profilem. Vzhledem k tomu, že DMT ovlivňují zejména zánětlivou složku nemoci dominující v počátcích RS, časné zahájení léčby je klíčové. Recentní doporučení se kloní k časnému zahájení terapie s vyšší účinností. Využití skupiny modulátorů S1P receptorů jako léků první volby v léčbě RS by tak mohlo vést ke stabilizaci většího počtu pacientů již od počátku nemoci, a tím ke zlepšení jejich dlouhodobé prognózy.

Over the last decades, the scenario of multiple sclerosis (MS) treatment has changed radically. The increasing availability of effective disease-modifying therapies (DMTs) has shifted therapeutic targets from a reduction in relapses and increase in disability to the absence of signs of disease activity both clinically and on MRI. The choice of therapy is increasingly complex and should be guided by adequate knowledge of the mechanism of action of each drug, its efficacy and safety profile. Since DMTs mainly affect the inflammatory component of the disease predominant in early MS, early initiation of treatment is crucial. Recent recommendations lean towards early initiation of therapy with higher efficacy. Thus, the use of the S1P receptor modulator family of drugs as the first choice in the treatment of MS could lead to the stabilization of more patients from the onset of the disease and thus improve their long-term prognosis.

• Klíčová slova
• ozanimod, ponesimod, siponimod,
• MeSH
• antirevmatika aplikace a dávkování   terapeutické užití   MeSH
• azetidiny aplikace a dávkování   terapeutické užití   MeSH
• benzylové sloučeniny terapeutické užití   MeSH
• fingolimod hydrochlorid aplikace a dávkování   škodlivé účinky   terapeutické užití   MeSH
• idiopatické střevní záněty farmakoterapie   MeSH
• indany aplikace a dávkování   terapeutické užití   MeSH
• klinická studie jako téma MeSH
• lidé MeSH
• modulátory receptorů sfingosin-1-fosfátu * aplikace a dávkování   škodlivé účinky   terapeutické užití   MeSH
• oxadiazoly terapeutické užití   MeSH
• roztroušená skleróza farmakoterapie   MeSH
• thiazoly aplikace a dávkování   terapeutické užití   MeSH
• Check Tag
• lidé MeSH

Background: Molecular hybridization and isostery are proven approaches in medicinal chemistry, and as such we used them to design novel compounds that we investigated as potential antimycobacterials to combat drug-resistant strains. Methods & results: Prepared N-alkyl-2-(pyrimidine-5-carbonyl)hydrazine-1-carboxamides were cyclized to N-alkyl-5-(pyrimidin-5-yl)-1,3,4-oxadiazol-2-amines along with their analogues. A total of 48 compounds were tested against Mycobacterium tuberculosis H37Rv, Mycobacterium avium and Mycobacterium kansasii, with oxadiazoles and C8-C12 alkyls being the most effective from a concentration of 2 μM. Multidrug-resistant strains were inhibited at same concentrations as the susceptible strain. For the most potent N-dodecyl-5-(pyrimidin-5-yl)-1,3,4-oxadiazol-2-amine, the mechanism of action related to cell wall biosynthesis was investigated. Conclusion: Pyrimidine-1,3,4-oxadiazole hybrids are unique antimycobacterial agents inhibiting mainly M. tuberculosis strains without cross-resistance to current drugs and are thus promising drug candidates.

• MeSH
• aminy farmakologie   MeSH
• antibakteriální látky * farmakologie   MeSH
• antituberkulotika farmakologie   chemie   MeSH
• mikrobiální testy citlivosti MeSH
• Mycobacterium tuberculosis * MeSH
• oxadiazoly farmakologie   chemie   MeSH
• pyrimidiny farmakologie   MeSH
• vztahy mezi strukturou a aktivitou MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Duchennova svalová dystrofie (DMD) je se svou incidencí 1 : 5 000 nově narozených chlapců nejčastějším svalovým onemocněním dětského věku. Je způsobena mutací v genu pro dystrofin, který se nalézá na X chromozomu. První příznaky zahrnují obvykle opoždění motorického vývoje, potíže s běháním nebo s chůzí do a ze schodů. Později se přidává slabost horních končetin, respirační insuficience a srdeční potíže, které bývají mezi 25.-30. rokem věku příčinou smrti.

Duchenne muscular dystrophy (DMD) is with its incidence 1 : 5 000 newborn males the most frequent muscle disease in childhood. It is caused by mutation in dystrophin gene located on X chromosome. First symptoms of DMD include delayed motor milestones, difficult running or climbing stairs, later we can see weakness of shoulder girdle. Cardiomyopathy and respiratory failure most often occur in the third decade. Because of new treatment possibilities, it is necessary to confirm diagnose as soon as possible. E. g. ataluren as a treatment for DMD boys can be used from the age of 2 years. We should test creatine kinase (which elevation more than 100x is typical for DMD) in all boys suspected from DMD as well as in all boys when we do any blood tests.

• Klíčová slova
• ataluren,
• MeSH
• dítě MeSH
• Duchennova muskulární dystrofie * diagnóza   genetika   patologie   terapie   MeSH
• kreatinkinasa analýza   MeSH
• lidé MeSH
• oxadiazoly farmakologie   terapeutické užití   MeSH
• výsledek terapie MeSH
• Check Tag
• dítě MeSH
• lidé MeSH
• mužské pohlaví MeSH
• Publikační typ
• kazuistiky MeSH
• směrnice pro lékařskou praxi MeSH

Enterovirus 70 (EV70) is a human pathogen belonging to the family Picornaviridae. EV70 is transmitted by eye secretions and causes acute hemorrhagic conjunctivitis, a serious eye disease. Despite the severity of the disease caused by EV70, its structure is unknown. Here, we present the structures of the EV70 virion, altered particle, and empty capsid determined by cryo-electron microscopy. The capsid of EV70 is composed of the subunits VP1, VP2, VP3, and VP4. The partially collapsed hydrophobic pocket located in VP1 of the EV70 virion is not occupied by a pocket factor, which is commonly present in other enteroviruses. Nevertheless, we show that the pocket can be targeted by the antiviral compounds WIN51711 and pleconaril, which block virus infection. The inhibitors prevent genome release by stabilizing EV70 particles. Knowledge of the structures of complexes of EV70 with inhibitors will enable the development of capsid-binding therapeutics against this virus. IMPORTANCE Globally distributed enterovirus 70 (EV70) causes local outbreaks of acute hemorrhagic conjunctivitis. The discharge from infected eyes enables the high-efficiency transmission of EV70 in overcrowded areas with low hygienic standards. Currently, only symptomatic treatments are available. We determined the structures of EV70 in its native form, the genome release intermediate, and the empty capsid resulting from genome release. Furthermore, we elucidated the structures of EV70 in complex with two inhibitors that block virus infection, and we describe the mechanism of their binding to the virus capsid. These results enable the development of therapeutics against EV70.

• MeSH
• akutní hemoragická konjunktivitida virologie   MeSH
• antivirové látky * farmakologie   MeSH
• elektronová kryomikroskopie MeSH
• kapsida * ultrastruktura   MeSH
• lidé MeSH
• lidský enterovirus D * účinky léků   ultrastruktura   MeSH
• oxadiazoly farmakologie   MeSH
• oxazoly farmakologie   MeSH
• virion účinky léků   ultrastruktura   MeSH
• virové plášťové proteiny MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH