Article
Clinical Neurology
Katharina Schiller, Saoussen Berrahmoune, Christelle Dassi, Isabelle Corriveau, Taghreed A. Ayash, Bradley Osterman, Chantal Poulin, Michael Shevell, Elisabeth Simard-Tremblay, Guillaume Sebire, Kenneth A. Myers
Summary: This randomized double-blind placebo-controlled crossover trial showed that memantine is a safe and effective treatment for children with developmental and epileptic encephalopathy, improving both seizure control and cognitive function.
Article
Pharmacology & Pharmacy
Jong Hoon Lee, Badar Kanwar, Asif Khattak, Eric Altschuler, Consolato Sergi, So Jeong Lee, Su-Hee Choi, Jungwuk Park, Michael Coleman, Jean Bourbeau
Summary: This study investigated the preventive treatment effects of dapsone on viral respiratory diseases (VRDs) and its role in the interferon response. The results showed that dapsone significantly reduced the incidence of VRDs in leprosy patients. The findings suggest that the application of dapsone can effectively reduce the occurrence of viral respiratory diseases.
NAUNYN-SCHMIEDEBERGS ARCHIVES OF PHARMACOLOGY
(2023)
Article
Medicine, General & Internal
Varun Reddy, Andrea Hernandez, Leah Grossman, Debra Angelo, Johnathan Frunzi
Summary: Korsakoff syndrome, often associated with long-term alcohol abuse, is characterized by cognitive impairments and executive function deficits. Management focuses on nutritional replenishment and electrolyte maintenance, with some off-label use of FDA-approved drugs for Alzheimer's showing potential benefits in treating neurocognitive deficits in Korsakoff patients.
CUREUS JOURNAL OF MEDICAL SCIENCE
(2021)
Article
Behavioral Sciences
Mary E. Moya-Mendez, David M. Mueller, Milton Pratt, Melanie Bonner, Courtney Elliott, Arsen Hunanyan, Gary Kucera, Cheryl Bock, Lyndsey Prange, Joan Jasien, Karen Keough, Vandana Shashi, Marie McDonald, Mohamad A. Mikati
Summary: ATP1A2 mutations can cause early-onset severe epileptic encephalopathy, leading to symptoms such as drug-resistant seizures and developmental delay. Memantine therapy, an NMDA receptor antagonist, showed tolerability and some improvements in patients with ATP1A2 mutations. Future studies on NMDAR antagonist therapy in ATP1A2-encephalopathy are warranted.
EPILEPSY & BEHAVIOR
(2021)
Article
Clinical Neurology
Chiara Montemitro, Alexandra Angebrandt, Tzu-Yun Wang, Mauro Pettorruso, Osama A. Abulseoud
Summary: Memantine has shown efficacy in reducing alcohol and opiate cravings, consumption, and withdrawal severity, but not significant effect on cocaine and nicotine use disorders. Possible mechanisms behind this variability need further study for a better understanding of its efficacy in treating drug addiction.
PROGRESS IN NEURO-PSYCHOPHARMACOLOGY & BIOLOGICAL PSYCHIATRY
(2021)
Article
Neurosciences
Ignazia Mocci, Maria Antonietta Casu, Valeria Sogos, Anna Liscia, Rossella Angius, Francesca Cadeddu, Maura Fanti, Patrizia Muroni, Giuseppe Talani, Andrea Diana, Maria Collu, Maria Dolores Setzu
Summary: This study investigated the anti-manic properties of the NMDA receptor antagonist memantine in a fruit fly model of bipolar disorder and found that memantine can improve behavioral abnormalities and reduce glutamate receptor overexpression. The results suggest that the fruit fly model is a promising tool for studying the neurobiology of bipolar disorders. Memantine may be a disease-modifying therapy with new mechanisms of action.
CNS NEUROSCIENCE & THERAPEUTICS
(2023)
Article
Pharmacology & Pharmacy
Vahid Shafiei-Irannejad, Samin Abbaszadeh, Paul M. L. Janssen, Hamid Soraya
Summary: Memantine is a non-competitive NMDA receptor antagonist used for Alzheimer's disease and potentially other pathologies. Research suggests that glutamate signaling may play a role in cancer progression. Additionally, NMDA receptors are being studied in relation to cardiovascular disorders.
EUROPEAN JOURNAL OF PHARMACOLOGY
(2021)
Review
Neurosciences
Diego Pichardo-Rojas, Pavel Salvador Pichardo-Rojas, Jose Manuel Cornejo-Bravo, Aracely Serrano-Medina
Summary: The primary mechanism for neuron death after an ischemic stroke is excessive depolarization leading to NMDA-mediated calcium entry and subsequent cellular death. Memantine, a non-competitive NMDA receptor antagonist, has shown promising preclinical and clinical evidence as a neuroprotective drug for ischemic stroke. Clinical trials have found that high-dose memantine can improve neurological function and aphasia in poststroke patients, but limitations such as small sample sizes limit the impact of these findings. Further research is needed to conclusively determine if memantine improves outcomes in patients post-ischemic stroke.
FRONTIERS IN NEUROSCIENCE
(2023)
Article
Neurosciences
Maxim Nikolaev, Anton Chizhov, Denis B. Tikhonov
Summary: The study compared the effects of different NMDAR antagonists on epileptiform activity induced by picrotoxin in rat brain slices. The results showed that memantine had a stronger inhibitory effect on PDS in fast-spiking interneurons (FSI) compared to pyramidal cells (PC), which could be explained by the use dependence of its action.
Article
Neurosciences
Alasdair J. Gibb
Summary: NMDA receptors, specifically the triheteromeric structure of GluN1/GluN2B/GluN2D receptors, play fundamental roles in synaptic physiology and have implications for pharmacological research. This study reviews the mechanism of action of drugs targeting allosteric antagonists at these receptors.
Article
Pharmacology & Pharmacy
Congwu Du, Yueming Hua, Kevin Clare, Kicheon Park, Craig P. Allen, Nora D. Volkow, Xiu-Ti Hu, Yingtian Pan
Summary: Individuals with substance use disorder are at a higher risk of contracting HIV and progressing to AIDS. Neurotoxicity and neurodegeneration are characteristic of HIV-1-associated neurocognitive disorders. Studies have found that cocaine potentiates the neurotoxic effects of HIV-associated proteins. The NMDA antagonist drug memantine shows potential in attenuating the neurotoxicity caused by cocaine and HIV.
FRONTIERS IN PHARMACOLOGY
(2022)
Article
Neurosciences
Cristina Delgado-Sallent, Pau Nebot, Thomas Gener, Amanda B. Fath, Melina Timplalexi, M. Victoria Puig
Summary: Neural synchrony and functional connectivity are disrupted in schizophrenia. Atypical antipsychotic drugs, but not typical antipsychotic drugs, can reduce prefrontal and cortical-hippocampal hypersynchrony induced by psychosis-like states, suggesting that atypical antipsychotic drugs target prefrontal-hippocampal pathways for antipsychotic action. Serotonin receptors may play a selective role in the distinct effects of atypical antipsychotic drugs compared to typical antipsychotic drugs.
Review
Pharmacology & Pharmacy
Karolina Podkowa, Kamil Czarnacki, Agnieszka Boronczyk, Michal Boronczyk, Justyna Paprocka
Summary: Migraine, a disorder that affects females more often than males, may be treated with NMDA receptor antagonists such as memantine and ketamine, according to a comprehensive literature review. Animal and in vitro studies have shown that these drugs inhibit the propagation of spreading depression (SD), a major mechanism in migraine pathophysiology. Clinical trials have also indicated that ketamine or memantine may be effective in treating severe migraine, although more studies with control groups are needed. These drugs could be a promising alternative for individuals with treatment-resistant migraine with aura or limited treatment options.
NAUNYN-SCHMIEDEBERGS ARCHIVES OF PHARMACOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Xiaozhen Wang, Ze Li, Xiaoyi Zhang, Meimei Kang, Caizhen Lv, Xu Zhang, Zhiwei Zhao, Yanchuan Wu, Penghui Song, Rong Wang
Summary: A newly designed compound, RERMS-MEM, exhibited strong NMDAR-blocking activity and neurotrophic effects, which could be potentially used in the treatment of Alzheimer's disease.
JOURNAL OF CHEMISTRY
(2023)
Article
Neurosciences
Kenan Yildizhan, Mustafa Naziroglu
Summary: TRPM2 channel is activated by excessive generation of mitochondrial and cytosolic ROS and influx of intracellular free Ca2+. The inhibitions of NMDA receptor and TRPM2 channel decrease ROS and apoptosis in neurons. The modulator role of memantine and NMDA via modulation of TRPM2 on oxidative neurodegeneration and apoptosis in SH-SY5Y cells was investigated. Inhibition of NMDA receptor via memantine treatment modulated HYP-mediated ROS, apoptosis, and TRPM2-induced excessive Ca2+ and may provide a strategy for protecting HYP-mediated neurodegenerative diseases.
Article
Chemistry, Organic
Peter R. Schreiner, Lars Rummel, Kai Hanke, Jonathan Becker
Summary: In this study, the thermodynamic stability of cis- and trans-alkenes substituted with dispersion energy donor (DED) groups was investigated through a combination of experimental and computational methods. The equilibrium between the two isomers was found to shift towards the more crowded cis-alkene as the substituent size increased. Noncovalent interactions, particularly long-range dispersion (LD) and Pauli exchange repulsion, were identified as the dominant factors influencing the equilibrium between cis- and trans-alkenes.
Article
Chemistry, Multidisciplinary
Viktor Paczelt, Raffael C. Wende, Peter R. Schreiner, Andre K. Eckhardt
Summary: In this study, the formation and spectroscopic characterization of glycine imine, the simplest imino acid, were reported using cryogenic matrix isolation IR and UV/Vis spectroscopy. Glycine imine was found to form after UV irradiation of 2-azidoacetic acid and could be interconverted between anti-(E,E)- and anti-(Z,Z)-conformations. In aqueous solution, glycine imine hydrolyzed to produce hydroxy glycine and hydrated glyoxylic acid. It was also observed that glycine imine could undergo self-reduction by oxidative decarboxylation chemistry when present in higher concentrations or in the presence of (FeSO4)-S-II as a reducing agent.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Artur Mardyukov, Raffael C. Wende, Peter R. Schreiner
Summary: 1,2-Ethenediols are key intermediates in prebiotic and interstellar syntheses of carbohydrates. In this study, we synthesized these enediols in the gas phase and trapped them in cryogenic argon matrices. Importantly, when subjected to photolysis at a wavelength of 180-254 nm, the enols rearrange into the simplest sugar, glycolaldehyde.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Alexander Seitz, Raffael C. C. Wende, Peter R. R. Schreiner
Summary: We describe the site-selective acetylation of partially protected monosaccharides using immobilized oligopeptide catalysts, synthesized via solid-phase peptide synthesis. The catalysts exhibit a reversed selectivity compared to N-methylimidazole and show high selectivity for various pyranosides. The catalysts demonstrate stability for multiple reaction cycles and can be easily reused after separation from the reaction solution. They can also be used in flow without any loss of reactivity and selectivity.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Sebastian Schwan, Andreas J. Achazi, Ferdinand Ziese, Peter R. Schreiner, Kerstin Volz, Stefanie Dehnen, Simone Sanna, Doreen Mollenhauer
Summary: A systematic study of cluster dimers in adamantane-like molecular materials reveals that the binding energy between the dimers increases with the size of the core and the substituents. The cluster interactions can be classified as substituent-substituent-dominated or core-core-dominated. Understanding the interaction of the cluster dimers allows for an initial assessment of the interactions in the materials.
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2023)
Article
Chemistry, Organic
Finn M. Wilming, Benito Marazzi, Paul P. Debes, Jonathan Becker, Peter R. Schreiner
Summary: We synthesized 14 2,2'-disubstituted 9,9'-bifluorenylenes to quantify London dispersion interactions between dispersion energy donors. Delta G(Z/E) was measured at 333 K using 1H NMR in seven solvents. Alkyl and aryl substituents showed a preference for the folded Z-isomer due to attractive London dispersion interactions, except for tert-butyl, which unexpectedly favored the unfolded E-isomer due to increased Pauli repulsion caused by close proximity of functional groups.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Jan M. Schuemann, Lukas Ochmann, Jonathan Becker, Ahmet Altun, Ingolf Harden, Giovanni Bistoni, Peter R. Schreiner
Summary: We conducted an experimental study on a cyclooctatetraene-based molecular balance with disubstituted tert-butyl (tBu), adamantyl (Ad), and diamantyl (Dia) substituents in the 1,4-/1,6-positions. Our measurements, supported by solvation computations, showed that the more sterically crowded 1,6-isomer is always favored and that the free energy is insensitive to substituent size, regardless of the solvent.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
David King, Tatjana Sumanovac, Steven Murkli, Peter R. Schreiner, Marina Sekutor, Lyle Isaacs
Summary: We synthesized quaternary (di)cationic triamantane derivatives G1 and G3 by permethylating the corresponding primary ammonium ions G2 and G4. The complexation behaviors of G1-G4 with CB[7] and CB[8] were examined using H-1 NMR spectroscopy. CB[8] fully encapsulated G1-G4 while CB[7] formed inclusion complexes with G1, G2, and G4 but could not fully encapsulate the central hydrophobic core of G3. The geometries of the CB[n]-guest complexes were determined by analyzing complexation-induced changes in chemical shifts and confirmed using molecular modeling.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Weiyu Qian, Raffael C. Wende, Peter R. Schreiner, Artur Mardyukov
Summary: The interstellar candidate phosphorus mononitride PN, a metastable species, was generated through high-vacuum flash pyrolysis of (o-phenyldioxyl)phosphinoazide in cryogenic matrices. Although the PN stretching band was not directly detected because of its low infrared intensity and possible overlaps with other strong bands, o-benzoquinone, carbon monoxide, and cyclopentadienone as additional fragmentation products were clearly identified. Moreover, an elusive o-benzoquinone-PN complex formed when (o-phenyldioxyl)phosphinoazide was exposed to UV irradiation at lambda=254 nm. Its recombination to (o-phenyldioxyl)-lambda(5)-phosphinonitrile was observed upon irradiation with the light at lambda=523 nm, which demonstrates for the first time the reactivity of PN towards an organic molecule. Energy profile computations at the B3LYP/def2-TZVP density functional theory level reveal a concerted mechanism. To provide further evidence, UV/Vis spectra of the precursor and the irradiation products were recorded and agree well with time-dependent DFT computations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Qigang Zhong, Artur Mardyukov, Ephrath Solel, Daniel Ebeling, Andre Schirmeisen, Peter R. Schreiner
Summary: On-surface synthesis is being recognized as the preferred method for generating and visualizing unconventional molecules. In this study, the structurally elusive cyclotriphosphazene (P3N3) was successfully synthesized on Cu(111) and Au(111) surfaces using molecular manipulation with unprecedented precision. The achieved atomic-level imaging revealed the planar D-3h-symmetric ring structure of cyclotriphosphazene.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Editorial Material
Chemistry, Multidisciplinary
Karsten Danielmeier, Peter R. Schreiner
Summary: The German Chemical Society (GDCh) has chosen "Rethinking Chemistry" as the guiding principle to address challenges related to climate change, loss of natural resources, and geopolitical conflicts. By encouraging scientists to approach chemistry from different perspectives, the GDCh aims to foster innovative and sustainable advancements in the field. This motto is also reflected in the upcoming GDCh Science Forum Chemistry (WiFo) 2023 and a dedicated Special Collection in Angewandte Chemie, showcasing the various aspects of Rethinking Chemistry.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Guanqi Qiu, Peter R. Schreiner
Summary: This study introduces the concepts of intrinsic and thermodynamic contributions to the barrier width in chemical reactions. Experimental and theoretical studies are used to demonstrate their distinct roles. The findings shed light on conflicting trends in chemical reactivities and contribute to a more comprehensive understanding of chemical reactions.
ACS CENTRAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Akkad Danho, Artur Mardyukov, Peter R. Schreiner
Summary: This study demonstrates the successful gas-phase synthesis of the previously unreported higher energy tautomer of propionic acid, prop-1-ene-1,1-diol. The enol was characterized using IR and UV/Vis spectroscopy along with density functional theory computations. Upon photolysis, the enol rearranges to propionic acid and methylketene.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Laura M. Grimm, Jeffry Setiadi, Boryslav Tkachenko, Peter R. Schreiner, Michael K. Gilson, Frank Biedermann
Summary: The thermodynamic parameters of host-guest binding can be used to describe, understand, and predict molecular recognition events in aqueous systems. This study focuses on the contributions of water to binding by studying binding thermodynamics for a series of host-guest systems. It is found that the enthalpic driving forces for binding increase at higher temperatures, and heat capacity changes appear to be a general feature of host-guest complex formation in water.
Article
Chemistry, Multidisciplinary
Akkad Danho, Artur Mardyukov, Peter R. Schreiner
Summary: The gas-phase synthesis of a higher energy tautomer, prop-1-ene-1,1-diol, of propionic acid is demonstrated in this study. The enol species is trapped in an argon matrix and characterized using IR and UV/Vis spectroscopy along with density functional theory calculations. Upon photolysis, the enol undergoes rearrangement to form propionic acid and methylketene.
CHEMICAL COMMUNICATIONS
(2023)