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Sunifiram
Sunifiram (developmental code name DM-235) is an experimental drug which has antiamnesic effects in animal studies and with significantly higher potency than piracetam. Sunifiram is a molecular simplification of unifiram (DM-232). Another analogue is sapunifiram (MN-19). As of 2016, sunifiram had not been subjected to toxicology testing, nor to any human clinical trials, and is not approved for use anywhere in the world. Pharmacology The mechanism of action of sunifiram is unknown. Sunifiram, as well as unifiram, were assayed at a wide panel of sites, including the most important receptors, ion channels, and transporters, but showed no affinity for any of the sites. They specifically did not bind to the glutamate, GABA, serotonin, dopamine, adrenergic, histamine, acetylcholine, or opioid receptors at concentrations of up to 1 μM. In addition, the drugs were tested on recombinant AMPA receptors and showed no potentiation of the receptors, indicating that they do not ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Experimental Drug
An experimental drug is a medicinal product (a drug or vaccine) that has not yet received approval from governmental regulatory authorities for routine use in human or veterinary medicine. A medicinal product may be approved for use in one disease or condition but still be considered experimental for other diseases or conditions. In 2018 the United States of America signed the legislation "Right to Try", this allows individuals who fit into the criteria to try experimental drugs that are not yet deemed safe. In the United States, the body responsible for approval is the U.S. Food and Drug Administration (FDA), which must grant the substance Investigational New Drug (IND) status before it can be tested in human clinical trials. IND status requires the drug's sponsor to submit an IND application that includes data from laboratory and animal testing for safety and efficacy. A drug that is made from a living organism or its products undergoes the same approval process but is called ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dopamine Receptor
Dopamine receptors are a class of G protein-coupled receptors that are prominent in the vertebrate central nervous system (CNS). Dopamine receptors activate different effectors through not only G-protein coupling, but also signaling through different protein (dopamine receptor-interacting proteins) interactions. The neurotransmitter dopamine is the primary endogenous ligand for dopamine receptors. Dopamine receptors are implicated in many neurological processes, including motivational and incentive salience, cognition, memory, learning, and fine motor control, as well as modulation of neuroendocrine signaling. Abnormal dopamine receptor signaling and dopaminergic nerve function is implicated in several neuropsychiatric disorders. Thus, dopamine receptors are common neurologic drug targets; antipsychotics are often dopamine receptor antagonists while psychostimulants are typically indirect agonists of dopamine receptors. Subtypes The existence of multiple types of receptors for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NMDA Receptor
The ''N''-methyl-D-aspartate receptor (also known as the NMDA receptor or NMDAR), is a glutamate receptor and ion channel found in neurons. The NMDA receptor is one of three types of ionotropic glutamate receptors, the other two being AMPA and kainate receptors. Depending on its subunit composition, its ligands are glutamate and glycine (or D-serine). However, the binding of the ligands is typically not sufficient to open the channel as it may be blocked by Mg2+ ions which are only removed when the neuron is sufficiently depolarized. Thus, the channel acts as a “coincidence detector” and only once both of these conditions are met, the channel opens and it allows positively charged ions (cations) to flow through the cell membrane. The NMDA receptor is thought to be very important for controlling synaptic plasticity and mediating learning and memory functions. The NMDA receptor is ionotropic, meaning it is a protein which allows the passage of ions through the cell membra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PKC Alpha
Protein kinase C alpha (PKCα) is an enzyme that in humans is encoded by the ''PRKCA'' gene. Function Protein kinase C (PKC) is a family of serine- and threonine-specific protein kinases that can be activated by calcium and the second messenger diacylglycerol. PKC family members phosphorylate a wide variety of protein targets and are known to be involved in diverse cellular signaling pathways. PKC family members also serve as major receptors for phorbol esters, a class of tumor promoters. Each member of the PKC family has a specific expression profile and is believed to play a distinct role in cells. The protein encoded by this gene is one of the PKC family members. This kinase has been reported to play roles in many different cellular processes, such as cell adhesion, cell transformation, cell cycle checkpoint, and cell volume control. Knockout studies in mice suggest that this kinase may be a fundamental regulator of cardiac contractility and Ca2+ handling in myocytes. Prote ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ca2+/calmodulin-dependent Protein Kinase II
/calmodulin-dependent protein kinase II (CaM kinase II or CaMKII) is a serine/threonine-specific protein kinase that is regulated by the /calmodulin complex. CaMKII is involved in many signaling cascades and is thought to be an important mediator of learning and memory. CaMKII is also necessary for homeostasis and reuptake in cardiomyocytes, chloride transport in epithelia, positive T-cell selection, and CD8 T-cell activation. Misregulation of CaMKII is linked to Alzheimer's disease, Angelman syndrome, and heart arrhythmia. Types There are two types of CaM kinase: * Specialized CaM kinases, such as the myosin light chain kinase that phosphorylates myosin, causing smooth muscles to contract * Multifunctional CaM kinases, also collectively called ''CaM kinase II'', which play a role in neurotransmitter secretion, transcription factor regulation, and glycogen metabolism. Structure, function, and autoregulation CaMKII accounts for 1–2% of all proteins in the brain, and ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upstream And Downstream (transduction)
The upstream signaling pathway is triggered by the binding of a signaling molecule, a ligand, to a receiving molecule, a receptor. Receptors and ligands exist in many different forms, and only recognize/bond to particular molecules. Upstream extracellular signaling transduce a variety of intracellular cascades. Receptors and ligands are common upstream signaling molecules that dictate the downstream elements of the signal pathway. A plethora of different factors affect which ligands bind to which receptors and the downstream cellular response that they initiate. TGF-β The extracellular type II and type I kinase receptors binding to the TGF-β ligands. Transforming growth factor-β (TGF-β) is a superfamily of cytokines that play a significant upstream role in regulating of morphogenesis, homeostasis, cell proliferation, and differentiation. The significance of TGF-β is apparent with the human diseases that occur when TGF-β processes are disrupted, such as cancer, and skel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NBQX
NBQX (2,3-dioxo-6-nitro-7-sulfamoyl-benzo uinoxaline) is an antagonist of the AMPA receptor. NBQX blocks AMPA receptors in micromolar concentrations (~10–20 μM) and also blocks kainate receptors. In experiments, it is used to counter glutamate excitotoxicity In excitotoxicity, nerve cells suffer damage or death when the levels of otherwise necessary and safe neurotransmitters such as glutamate become pathologically high, resulting in excessive stimulation of receptors. For example, when glutamate .... NBQX was found to have anticonvulsant activity in rodent seizure models.Yamaguchi, S.; Donevan, S.D.; Rogawski, M.A. (1993). Anticonvulsant activity of AMPA/kainate antagonists: comparison of GYKI 52466 and NBOX in maximal electroshock and chemoconvulsant seizure models. ''Epilepsy Res.'' 15:179–184. As the disodium salt, NBQX is soluble in water at high concentrations (at least up to 100 mM). See also * CNQX * DNQX * Fanapanel (MPQX) * Quinoxalinedione References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Receptor Antagonist
A receptor antagonist is a type of receptor ligand or drug that blocks or dampens a biological response by binding to and blocking a receptor rather than activating it like an agonist. Antagonist drugs interfere in the natural operation of receptor proteins.Pharmacology Guide: In vitro pharmacology: concentration-response curves " '' GlaxoWellcome.'' Retrieved on December 6, 2007. They are sometimes called blockers; examples include alpha blockers, beta blocker [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amnesia
Amnesia is a deficit in memory caused by brain damage or disease,Gazzaniga, M., Ivry, R., & Mangun, G. (2009) Cognitive Neuroscience: The biology of the mind. New York: W.W. Norton & Company. but it can also be caused temporarily by the use of various sedatives and hypnotic drugs. The memory can be either wholly or partially lost due to the extent of damage that was caused. There are two main types of amnesia: retrograde amnesia and anterograde amnesia. Retrograde amnesia is the inability to retrieve information that was acquired before a particular date, usually the date of an accident or operation. In some cases the memory loss can extend back decades, while in others the person may lose only a few months of memory. Anterograde amnesia is the inability to transfer new information from the short-term store into the long-term store. People with anterograde amnesia cannot remember things for long periods of time. These two types are not mutually exclusive; both can occur si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AMPA Receptor Positive Allosteric Modulator
AMPA receptor positive allosteric modulators are positive allosteric modulators (PAMs) of the AMPA receptor, receptor (AMPR), a type of ionotropic glutamate receptor which mediates most fast synaptic cleft, synaptic neurotransmission in the central nervous system. Medical applications AMPAR PAMs have cognition- and memory-enhancing and antidepressant-like effects in preclinical models, and have potential medical applications in the treatment of cognitive impairment (e.g., Schizophrenia#Cognitive dysfunction, cognitive symptoms in schizophrenia, mild cognitive impairment), dementia (e.g., Alzheimer's disease), depression (mood), depression, and for other indications. They can broadly be divided into low-impact and high-impact potentiators, with high-impact potentiators able to produce comparatively more robust increases in AMPAR activation. However, high-impact AMPAR PAMs can cause motor coordination motor disorder, disruptions, convulsions, and neurotoxicity at sufficiently high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AMPA Receptor
The α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (also known as AMPA receptor, AMPAR, or quisqualate receptor) is an ionotropic transmembrane receptor for glutamate (iGluR) that mediates fast synaptic transmission in the central nervous system (CNS). It has been traditionally classified as a non-NMDA-type receptor, along with the kainate receptor. Its name is derived from its ability to be activated by the artificial glutamate analog AMPA. The receptor was first named the "quisqualate receptor" by Watkins and colleagues after a naturally occurring agonist quisqualate and was only later given the label "AMPA receptor" after the selective agonist developed by Tage Honore and colleagues at the Royal Danish School of Pharmacy in Copenhagen. The ''GRIA2''-encoded AMPA receptor ligand binding core (GluA2 LBD) was the first glutamate receptor ion channel domain to be crystallized. Structure and function Subunit composition AMPARs are composed of four types of subun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opioid Receptor
Opioid receptors are a group of inhibitory G protein-coupled receptors with opioids as ligands. The endogenous opioids are dynorphins, enkephalins, endorphins, endomorphins and nociceptin. The opioid receptors are ~40% identical to somatostatin receptors (SSTRs). Opioid receptors are distributed widely in the brain, in the spinal cord, on peripheral neurons, and digestive tract. Discovery By the mid-1960s, it had become apparent from pharmacologic studies that opiate drugs were likely to exert their actions at specific receptor sites, and that there were likely to be multiple such sites. Early studies had indicated that opiates appeared to accumulate in the brain. The receptors were first identified as specific molecules through the use of binding studies, in which opiates that had been labeled with radioisotopes were found to bind to brain membrane homogenates. The first such study was published in 1971, using 3H-levorphanol. In 1973, Candace Pert and Solomon H. Snyder publ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
