For details of individual neurotoxins See:List of neurotoxins File:Cyanobacterial Scum.JPG Neurotoxins can be found in a number of organisms, including some strains of cyanobacteria,[1] which can be found in algal blooms or washed up on the shore in a green scum[2] Neurotoxin is derived from the Greek νευρών (nevron / neuron) sentido "nerve" (derived from neuro: "cord")[3] and Latin toxicum meaning "poison" (derived from Greek τοξικόν φάρμακον toxikon pharmakon, sentido "arrow poison"[4]). They are an extensive class of exogenous chemical neurological insults[5] which can adversely affect function in both developing and mature nervous tissue.[6] The term can also be used to classify endogenous compounds which when abnormally concentrated can prove neurologically toxic.[5] Though neurotoxins are often neurologically destructive, their ability to specifically target neural components is important in the study of nervous systems.[7] Common examples of neurotoxins include lead,[8] etanol,[9] glutamate,[10] nitric oxide (NO),[11] botulinum toxin,[12] tetanus toxin,[13] and tetrodotoxin.[7] Neurotoxin activity can be characterized by the ability to inhibit neuron control over ion concentrations across the cell membrane,[7] or communication between neurons across a synapse.[14] Local pathology of neurotoxin exposure often includes neuron excitotoxicity or apoptosis[15] but can also include glial cell damage.[16] Macroscopic manifestations of neurotoxin exposure can include widespread central nervous system damage such as mental retardation,[6] persistent memory impairments,[17] epilepsia, and dementia.[18] Adicionalmente, neurotoxin-mediated peripheral nervous system damage such as neuropathy or myopathy is common. Support has been shown for a number of treatments aimed at attenuating neurotoxin-mediated injury, such as antioxidant,[9] antitoxin[19] and ethanol[20] administration. Contents 1 Fondo 2 Applications in neuroscience 3 Mechanisms of activity 3.1 Inhibitors 3.1.1 Sodium channel Tetrodotoxin 3.1.2 Potassium channel Tetraethylammonium 3.1.3 canal de cloruro Chlorotoxin Curare 3.1.4 Calcium channel Conotoxin 3.1.5 Synaptic vesicle release Botulinum toxin Tetanus toxin 3.1.6 Blood brain barrier Aluminum Mercury 3.2 Receptor agonists and antagonists 3.2.1 Bungarotoxin 3.2.2 Anatoxin-a 3.3 Cytoskeleton interference 3.3.1 Arsenic Ammonia 3.4 Calcium-mediated cytotoxicity 3.4.1 Lead 3.5 Neurotoxins with multiple effects 3.5.1 Ethanol 3.6 n-Hexane 3.7 Endogenous neurotoxin sources 3.7.1 Nitric oxide 3.7.2 Glutamate 4 Ver también 5 Notas 6 Referencias 7 Otras lecturas 8 External links Background File:Complete neuron cell diagram en.svg Illustration of typical multipolar neuron Exposure to neurotoxins in society is not new as civilizations have been exposed to neurologically destructive compounds for thousands of years. One notable example is the possible significant lead exposure during the Roman Empire resulting from the development of extensive plumbing networks[21] and the habit of boiling vinegared wine in lead pans to sweeten it, the process generating lead acetate, conocido como "sugar of lead"[cita necesaria]. In part, neurotoxins have been part of human history because of the fragile and susceptible nature of the nervous system, making it highly prone to disruption. The nervous tissue found in the brain, médula espinal, and periphery comprises an extraordinarily complex biological system that largely defines many of the unique traits of individuals. As with any highly complex system, sin embargo, even small perturbations to its environment can lead to significant functional disruptions. Properties leading to the susceptibility of nervous tissue include a high surface area of neurons, a high lipid content which retains lipophilic toxins, high blood flow to the brain inducing increased effective toxin exposure, and the persistence of neurons through an individual's lifetime, leading to compounding of damages.[22] Como resultado, the nervous system has a number of mechanisms designed to protect it from internal, and external insults, including the blood brain barrier. The blood brain barrier (BBB) is one critical example of protection which prevents toxins and other adverse compounds from reaching the brain.[23] As the brain requires nutrient entry and waste removal, it is perfused by blood flow. Blood can carry a number of ingested toxins, sin embargo, which would induce significant neuron death if they reach nervous tissue. Así, protective cells termed astrocytes surround the capillaries in the brain and absorb nutrients from the blood and subsequently transport them to the neurons, effectively isolating the brain from a number of potential chemical insults.[23] Archivo:Blood Brain Barriere.jpg Astrocytes surrounding capillaries in the brain to form the blood brain barrier This barrier creates a tight hydrophobic layer around the capillaries in the brain, inhibiting the transport of large or hydrophilic compounds. In addition to the BBB, the choroid plexus provides a layer of protection against toxin absorption in the brain. The choroid plexuses are vascularized layers of tissue found in the third, fourth, and lateral ventricles of the brain, which through the function of their ependymal cells, are responsible for the synthesis of cerebrospinal fluid (CSF).[24] Importantly, through selective passage of ions and nutrients and trapping heavy metals such as lead, the choroid plexuses maintain a strictly regulated environment which contains the brain and spinal cord.[23][24] Archivo:Gray749.png Choroid plexus By being hydrophobic and small, or inhibiting astrocyte function, some compounds including certain neurotoxins are able to penetrate into the brain and induce significant damage. En los tiempos modernos, scientists and physicians have been presented with the challenge of identifying and treating neurotoxins, which has resulted in a growing interest in both neurotoxicology research and clinical studies.[25] Though clinical neurotoxicology is largely a burgeoning field, extensive inroads have been made in the identification of many environmental neurotoxins leading to the classification of 750 Para 1000 known potentially neurotoxic compounds.[22] Due to the critical importance of finding neurotoxins in common environments, specific protocols have been developed by the Environmental Protection Agency (EPA) for testing and determining neurotoxic effects of compounds (USEPA 1998). Adicionalmente, in-vitro systems have increased in use as they provide significant improvements over the more common in-vivo systems of the past. Examples of improvements include tractable, uniform environments, and the elimination of contaminating effects of systemic metabolism.[25] In-vitro systems, sin embargo, have presented problems as it has been difficult to properly replicate the complexities of the nervous system, such as the interactions between supporting astrocytes and neurons in creating the BBB.[26] To even further complicate the process of determining neurotoxins when testing in-vitro, neurotoxicity and cytotoxicity may be difficult to distinguish as exposing neurons directly to compounds may not be possible in-vivo, as it is in-vitro. Adicionalmente, the response of cells to chemicals may not accurately convey a distinction between neurotoxins and cytotoxins, as symptoms like oxidative stress or skeletal modifications may occur in response to either.[27] In an effort to address this complication, neurite outgrowths (either axonal or dendritic) in response to applied compounds have recently been proposed as a more accurate distinction between true neurotoxins and cytotoxins in an in-vitro testing environment. Due to the significant inaccuracies associated with this process, sin embargo, it has been slow in gaining widespread support.[28] Adicionalmente, biochemical mechanisms have become more widely used in neurotoxin testing, such that compounds can be screened for sufficiency to induce cell mechanism interference, like the inhibition of acetylcholinesterase capacity of organophosphates (includes DDT and sarin gas).[29] Though methods of determining neurotoxicity still require significant development, the identification of deleterious compounds and toxin exposure symptoms has undergone significant improvement. Applications in neuroscience Though diverse in chemical properties and functions, neurotoxins share the common property that they act by some mechanism leading to either the disruption or destruction of necessary components within the nervous system. Neurotoxins, sin embargo, by their very design have shown highly useful in the field of neuroscience. As the nervous system in most organisms is both highly complex and necessary for survival, it has naturally become a target for attack by both predators and prey. As venomous organisms often use their neurotoxins to subdue a predator or prey very rapidly, toxins have evolved to become highly specific to their target channels such that the toxin does not readily bind other targets.[30] Como tal, neurotoxins provide an effective means by which certain elements of the nervous system may be accurately and efficiently targeted. An early example of neurotoxin based targeting used radiolabeled tetrodotoxin to assay sodium channels and obtain precise measurements about their concentration along nerve membranes.[30] Likewise through isolation of certain channel activities, neurotoxins have provided the ability to improve the original Hodgkin-Huxley model of the neuron in which it was theorized that single generic sodium and potassium channels could account for most nervous tissue function.[30] From this basic understanding, the use of common compounds such as tetrodotoxin, tetraethylammonium, and bungarotoxins have led to a much deeper understanding of the distinct ways in which individual neurons may behave. Mechanisms of activity As neurotoxins are compounds which adversely affect the nervous system, a number of mechanisms through which they function are through the inhibition of neuron cellular processes. These inhibited processes can range from membrane depolarization mechanisms to inter-neuron communication. By inhibiting the ability for neurons to perform their expected intracellular functions, or pass a signal to a neighboring cell, neurotoxins can induce systemic nervous system arrest as in the case of botulinum toxin,[14] or even nervous tissue death.[31] The time required for the onset of symptoms upon neurotoxin exposure can vary between different toxins, being on the order of hours for botulinum toxin[19] and years for lead.[32] Neurotoxin classification Neurotoxins Na channel inhibitors Tetrodotoxin[7] K channel inhibitors Tetraethylammonium[33] Cl channel inhibitors Chlorotoxin,[34] curare[35] Ca channel inhibitors Conotoxin[36] Inhibitors of synaptic vesicle release Botulinum toxin,[37] tetanus toxin[38] Receptor inhibitors Bungarotoxin[39] Blood brain barrier inhibitors Aluminium,[40] mercury[41] Cytoskeleton interference Arsenic,[42] ammonia[43] Ca-mediated cytotoxicity Lead[44] Multiple effects Ethanol[45][46] Endogenous neurotoxin sources Nitric oxide,[47] glutamate[48] Inhibitors Sodium channel Tetrodotoxin File:Puffer Fish DSC01257.JPG The puffer fish is a well known tetrodoxin producer. Tetrodotoxin (TTX) is a poison produced by organisms belonging to the Tetradontidae order, which includes the puffer fish, ocean sunfish, and porcupine fish.[49] Within the puffer fish, which is a common delicacy especially in Japan, TTX is found in the liver, Gónadas, ovaries, intestines, and skin.[7][50] TTX can be fatal if consumed, and has become a common form of poisoning in many countries. Common symptoms of TTX consumption include paraesthesia (often restricted to the mouth and limbs), muscle weakness, Náuseas, and vomiting[49] and often manifest within 30 minutes of ingestion.[51] The primary mechanism by which TTX is toxic is through the inhibition of sodium channel function, which reduces the functional capacity of neuron communication. This inhibition largely affects a susceptible subset of sodium channels known as TTX-sensitive (TTX-s), which also happens to be largely responsible for the sodium current that drives the depolarization phase of neuron action potentials.[7] Archivo:Tetrodotoxin AP.png Inhibited signaling response resulting from neuron exposure to tetrodotoxin. TTX-resistant (TTX-r) is another form of sodium channel which has limited sensitivity to TTX, and is largely found in small diameter axons such as those found in nociception neurons.[7] When significant levels of TTX is ingested, it will bind sodium channels on neurons and reduce their membrane permeability to sodium. This results in an increased effective threshold of required excitatory signals in order to induce an action potential in a postsynaptic neuron.[7] The effect of this increased signaling threshold is a reduced excitability of postsynaptic neurons, and subsequent loss of motor and sensory function which can result in paralysis and death. Though assisted ventilation may increase the chance of survival after TTX exposure, there is currently no antitoxin. The use of the acetylcholinesterase inhibitor Neostigmine or the acetylcholine antagonist Atropine, sin embargo, can increase sympathetic nerve activity enough to improve the chance of survival after TTX exposure.[49] This article or section may be confusing or unclear for some readers, and should be edited to rectify this. Please improve the article, or discuss the issue on the talk page. Potassium channel Tetraethylammonium Tetraethylammonium (TEA) is a compound that, like a number of neurotoxins, was first identified through its damaging effects to the nervous system and shown to have the capacity of inhibiting the function of motor nerves and thus the contraction of the musculature in a manner similar to that of curare.[52] Adicionalmente, through chronic TEA administration, muscular atrophy would be induced.[52] It was later determined that TEA functions in-vivo primarily through its ability to inhibit both the potassium channels responsible for the delayed rectifier seen in an action potential and some population of calcium-dependent potassium channels.[33] It is this capability to inhibit potassium flux in neurons that has made TEA one of the most important tools in neuroscience. It has been hypothesized that the ability for TEA to inhibit potassium channels is derived from its similar space-filling structure to potassium ions.[52] What makes TEA very useful for neuroscientists is its specific ability to eliminate potassium channel activity, thereby allowing the study of neuron response contributions of other ion channels such as voltage gated sodium channels.[53] In addition to its many uses in neuroscience research, TEA has been shown to perform as an effective treatment of Parkinson’s disease through its ability to limit the progression of the disease.[54] Chloride channel Chlorotoxin Chlorotoxin (Cltx) is the active compound found in scorpion venom, and is primarily toxic because of its ability to inhibit the conductance of chloride channels.[34] Ingestion of lethal volumes of Cltx results in paralysis through this ion channel disruption. Similar to botulinum toxin, Cltx has been shown to possess significant therapeutic value. Evidence has shown that Cltx can inhibit the ability for gliomas to infiltrate healthy nervous tissue in the brain, significantly reducing the potential invasive harm caused by tumors.[55][56] Curare The term "curare" is ambiguous because it has been used to describe a number of poisons which at the time of naming were understood differently from present day understandings. In the past the characterization has meant poisons used by South American tribes on arrows or darts, though it has matured to specify a specific categorization of poisons which act on the neuromuscular junction to inhibit signaling and thus induce muscle relaxation.[57] The neurotoxin category contains a number of distinct poisons, though all were originally purified from plants originating in South America.[57] The effect with which ingested curare poison is usually associated is muscle paralysis and resultant death.[58] Curare notably functions to inhibit GABA-induced chloride channels, resulting in reduced ability for chloride to flux.[35] Como tal, the neurotoxin is capable of significantly reducing neuromuscular junction signaling, an effect which has resulted in its use by anesthesiologists to produce muscular relaxation.[59] Calcium channel Conotoxin Conotoxins represent a category of poisons produced by the marine cone snail, and are capable of inhibiting the activity of a number of ion channels such as calcium, sodium, or potassium channels.[60][61] En muchos casos, the toxins released by the different types of cone snails include a range of different types of conotoxins, which may be specific for different ion channels, thus creating a venom capable of widespread nerve function interruption.[60] One of the unique forms of conotoxins, ω-conotoxin (ω-CgTx) is highly specific for Ca channels and has shown usefulness in isolating them from a system.[62] As calcium flux is necessary for proper excitability of a cell, any significant inhibition could prevent a large amount of functionality. Significativamente, ω-CgTx is capable of long term binding to and inhibition of voltage-dependent calcium channels located in the membranes of neurons but not those of muscle cells.[63] Synaptic vesicle release Botulinum toxin File:Botulinum Toxin Mechanism.png Mechanism of Botulinum Toxin neurotoxicity Botulinum Toxin (BTX) is a group of neurotoxins consisting of seven distinct compounds, referred to as BTX-A,B,C,D,E,F,G, which are produced by the bacterium Clostridium Botulinum and lead to muscular paralysis.[64] A notably unique feature of BTX is its relatively common therapeutic use in treating dystonia and spasticity disorders,[64] as well as in inducing muscular atrophy[12] despite being the most poisonous substance known.[19] BTX functions peripherally to inhibit acetylcholine (ACh) release at the neuromuscular junction through degradation of the SNARE proteins required for ACh vesicle-membrane fusion.[37] As the toxin is highly biologically active, an estimated dose of 1μg/kg body weight is sufficient to induce an insufficient tidal volume and resultant death by asphyxiation.[14] Due to its high toxicity, BTX antitoxins have been an active area of research. It has been shown that capsaicin (active compound responsible for heat in chili peppers) can bind the TRPV1 receptor expressed on cholinergic neurons and inhibit the toxic effects of BTX.[19] Tetanus toxin Tetanus neurotoxin (TeNT) is a compound that functionally reduces inhibitory transmissions in the nervous system resulting in muscular tetany. TeNT is similar to BTX, and is in fact highly similar in structure and origin; both belonging to the same category of clostridial neurotoxins.[13] Like BTX, TeNT inhibits inter-neuron communication by means of vesicular neurotransmitter (Nuevo Testamento) release.[38] One notable difference between the two compounds is that while BTX inhibits muscular contractions, TeNT induces them. Though both toxins inhibit vesicle release at neuron synapses, the reason for this different manifestation is that BTX functions mainly in the peripheral nervous system (PNS) while TeNT is largely active in the central nervous system (CNS).[65] This is a result of TeNT migration through motor neurons to the inhibitory neurons of the spinal cord after entering through endocytosis.[66] This results in a loss of function in inhibitory neurons within the CNS resulting in systemic muscular contractions. Similar to the prognosis of a lethal dose of BTX, TeNT leads to paralysis and subsequent suffocation.[66] Blood brain barrier Aluminum Neurotoxic behavior of aluminum is known to occur upon entry into the circulatory system, where it can migrate to the brain and inhibit some of the crucial functions of the blood brain barrier (BBB).[40] A loss of function in the BBB can produce significant damage to the neurons in the CNS, as the barrier protecting the brain from other toxins found in the blood will no longer be capable of such action. Though the metal is known to be neurotoxic, effects are usually restricted to patients incapable of removing excess ions from the blood, such as those experiencing renal failure.[67] Patients experiencing aluminum toxicity can exhibit symptoms such as impaired learning and reduced motor coordination.[68] Adicionalmente, systemic aluminum levels are known to increase with age, and have been shown to correlate with Alzheimer’s Disease, implicating it as a neurotoxic causative compound of the disease.[69] Mercury Mercury is capable of inducing CNS damage by migrating into the brain by crossing the BBB.[41] Mercury exists in a number of different compounds, though methylmercury (MeHg) is the only significantly neurotoxic form.[41] MeHg is usually acquired through consumption of seafood, as it tends to concentrate in organisms high on the food chain.[70] It is known that the mercuric ion inhibits amino acid (AA) and glutamate (Glu) transport, potentially leading to excitotoxic effects.[71] Receptor agonists and antagonists Bungarotoxin Bungarotoxin is a compound with known interaction with nicotinic acetylcholine receptors (nAChRs), which constitute a family of ion channels whose activity is triggered by neurotransmitter binding.[72] Bungarotoxin is produced in a number of different forms, though one of the commonly used forms is the long chain alpha form, α-bungarotoxin, which is isolated from the banded krait snake.[39] Though extremely toxic if ingested, α-bungarotoxin has shown extensive usefulness in neuroscience as it is particularly adept at isolating nAChRs due to its high affinity to the receptors.[39] As there are multiple forms of bungarotoxin, there are different forms of nAChRs to which they will bind, y α-bungarotoxin is particularly specific for α7-nAChR.[73] Éste α7-nAChR functions to allow calcium ion influx into cells, and thus when blocked by ingested bungarotoxin will produce damaging effects, as ACh signaling will be inhibited.[73] De la misma manera, the use of α-bungarotoxin can be very useful in neuroscience if it is desirable to block calcium flux in order to isolate effects of other channels. Adicionalmente, different forms of bungarotoxin may be useful for studying inhibited nAChRs and their resultant calcium ion flow in different systems of the body. Por ejemplo α-bungarotoxin is specific for nAChRs found in the musculature and κ-bungarotoxin is specific for nAChRs found in neurons.[74] Anatoxin-a 30px External videos 16px Very Fast Death Factor University of Nottingham File:Anatoxin-a.png Anatoxin-a Investigations into anatoxin-a, también conocido como "Very Fast Death Factor", began in 1961 following the deaths of cows that drank from a lake containing an algal bloom in Saskatchewan, Canada.[75][76] It is a cyanotoxin produced by at least four different genera of cyanobacteria, and has been reported in North America, Europa, África, Asia, and New Zealand.[77] Toxic effects from anatoxin-a progress very rapidly because it acts directly on the nerve cells (neurons). The progressive symptoms of anatoxin-a exposure are loss of coordination, twitching, convulsions and rapid death by respiratory paralysis. The nerve tissues which communicate with muscles contain a receptor called the nicotinic acetylcholine receptor. Stimulation of these receptors causes a muscular contraction. The anatoxin-a molecule is shaped so it fits this receptor, and in this way it mimics the natural neurotransmitter normally used by the receptor, acetylcholine. Once it has triggered a contraction, anatoxin-a does not allow the neurons to return to their resting state, because it is not degraded by cholinesterase which normally performs this function. As a result the muscle cells contract permanently, the communication between the brain and the muscles is disrupted and breathing stops.[78][79] When it was first discovered, the toxin was called the Very Fast Death Factor (VFDF) because when it was injected into the body cavity of mice it induced tremors, paralysis and death within a few minutes. En 1977, the structure of VFDF was determined as a secondary, bicyclic amine alkaloid, and it was renamed anatoxin-a.[80][81] Structurally, it is similar to cocaine.[82] There is continued interest in anatoxin-a because of the dangers it presents to recreational and drinking waters, and because it is a particularly useful molecule for investigating acetylcholine receptors in the nervous system.[83] The deadliness of the toxin means that it has a high military potential as a toxin weapon.[84] Cytoskeleton interference Arsenic Arsenic is a neurotoxin commonly found concentrated in areas exposed to agricultural runoff, minería, and smelting sites (Martinez-Finley 2011). One of the effects of arsenic ingestion during the development of the nervous system is the inhibition of neurite growth[85] which can occur both in PNS and the CNS.[86] This neurite growth inhibition can often lead to defects in neural migration, and significant morphological changes of neurons during development,[87]) often leading to neural tube defects in neonates.[88] As a metabolite of arsenic, arsenite is formed after ingestion of arsenic and has shown significant toxicity to neurons within about 24 hours of exposure. The mechanism of this cytotoxicity functions through arsenite-induced increases in intracellular calcium ion levels within neurons, which may subsequently reduce mitochondrial transmembrane potential which activates caspases, triggering cell death.[87] Another known function of arsenite is its destructive nature towards the cytoskeleton through inhibition of neurofilament transport.[42] This is particularly destructive as neurofilaments are used in basic cell structure and support. Lithium administion has shown promise, sin embargo, in restoring some of the lost neurofilament motility.[89] Adicionalmente, similar to other neurotoxin treatments, the administration of certain antioxidants has shown some promise in reducing neurotoxicity of ingested arsenic.[87] Ammonia File:Astrocyte endothel interaction 01.png An Astrocyte, a cell notable for maintaining the blood brain barrier Ammonia toxicity is often seen through two routes of administration, either through consumption or through endogenous ailments such as hepatic failure.[90][91] One notable case in which ammonia toxicity is common is in response to cirrhosis of the liver which results in hepatic encephalopathy, and can result in cerebral edema (Haussinger 2006). This cerebral edema can be the result of nervous cell remodeling. As a consequence of increased concentrations, ammonia activity in-vivo has been shown to induce swelling of astrocytes in the brain through increased production of cGMP (Cyclic Guanosine Monophosphate) within the cells which leads to Protein Kinase G-mediated(PKG) cytoskeletal modifications.[43] The resultant effect of this toxicity can be reduced brain energy metabolism and function. Importantly, the toxic effects of ammonia on astrocyte remodling can be reduced through administration of L-carnitine.[90] This astrocyte remodeling appears to be mediated through ammonia-induced mitochondrial permeability transition. This mitochondrial transition is a direct result of glutamine activity a compound which forms from ammonia in-vivo.[92] Administration of antioxidants or glutaminase inhibitor can reduce this mitochondrial transition, and potentially also astrocyte remodling.[92] Calcium-mediated cytotoxicity File:Trinkwasserleitung Blei.jpg Lead pipes are common sources of ingested lead. Lead Lead is a potent neurotoxin whose toxicity has been recognized for at least thousands of years.[93] Though neurotoxic effects for lead are found in both adults and young children, the developing brain is particularly susceptible to lead-induced harm, effects which can include apoptosis and excitotoxicity.[93] An underlying mechanism by which lead is able to cause harm is its ability to be transported by calcium ATPase pumps across the BBB, allowing for direct contact with the fragile cells within the central nervous system.[94] Neurotoxicity results from lead’s ability to act in a similar manner to calcium ions, as concentrated lead will lead to cellular uptake of calcium which disrupts cellular homeostasis and induces apoptosis.[44] It is this intracellular calcium increase that activates protein kinase C (PKC), which manifests as learning deficits in children as a result of early lead exposure.[44] In addition to inducing apoptosis, lead inhibits interneuron signaling through the disruption of calcium-mediated neurotransmitter release.[95] Neurotoxins with multiple effects Ethanol File:Photo of baby with FAS.jpg As a neurotoxin, ethanol has been shown to induce nervous system damage and affect the body in a variety of ways, where in small doses ethanol has even been shown to have health benefits.[96] Among the known effects of ethanol exposure are both transient and lasting consequences. Some of the lasting effects include long-term reduced neurogenesis in the hippocampus,[97][98] widespread brain atrophy,[99] and induced inflammation in the brain.[100] Of note, chronic ethanol ingestion has additionally been shown to induce reorganization of cellular membrane constituents, leading to a lipid bilayer marked by increased membrane concentrations of cholesterol and saturated fat.[46] This is important as neurotransmitter transport can be impaired through vesicular transport inhibition, resulting in diminished neural network function. One significant example of reduced inter-neuron communication is the ability for ethanol to inhibit NMDA receptors in the hippocampus, resulting in reduced LTP (long-term potentiation) and memory acquisition.[45] NMDA has been shown to play an important role in long-term potentiation (LTP) and consequently memory formation.[101] With chronic ethanol intake, sin embargo, the susceptibility of these NMDA receptors to induce LTP increases in the mesolimbic dopamine neurons in an inositol 1,4,5-triphosphate (IP3) dependent manner.[102] This reorganization may lead to neuronal cytotoxicity both through hyperactivation of postsynaptic neurons and through induced addiction to continuous ethanol consumption. It has, additionally, been shown that ethanol directly reduces intracellular calcium ion accumulation through inhibited NMDA receptor activity, and thus reduces the capacity for the occurrence of LTP.[20] In addition to the neurotoxic effects of ethanol in mature organisms, chronic ingestion is capable of inducing severe developmental defects. Evidence was first shown in 1973 of a connection between chronic ethanol intake by mothers and defects in their offspring.[103] This work was responsible for creating the classification of fetal alcohol syndrome; a disease characterized by common morphogenesis aberrations such as defects in craniofacial formation, limb development, and cardiovascular formation. The magnitude of ethanol neurotoxicity in fetuses leading to fetal alcohol syndrome has been shown to be dependent on antioxidant levels in the brain such as vitamin E.[104] As the fetal brain is relatively fragile and susceptible to induced stresses, severe deleterious effects of alcohol exposure can be seen in important areas such as the hippocampus and cerebellum. The severity of these effects is directly dependent upon the amount and frequency of ethanol consumption by the mother, and the stage in development of the fetus.[105] It is known that ethanol exposure results in reduced antioxidant levels, mitochondrial dysfunction (Chu 2007), and subsequent neuronal death, seemingly as a result of increased generation of reactive oxidative species (ROS).[31] This is a plausible mechanism, as there is a reduced presence in the fetal brain of antioxidant enzymes such as catalase and peroxidase.[106] In support of this mechanism, administration of high levels of dietary vitamin E results in reduced or eliminated ethanol-induced neurotoxic effects in fetuses.[9] n-Hexane n-Hexane is a neurotoxin. It is also a cleaner that is lower cost than using alcohol to clean electronics products.[cita necesaria] Several workers in Chinese electronics factories have been poisoned by n-Hexane in recent years.[107][108][109][110] Endogenous neurotoxin sources Unlike most common sources of neurotoxins which are acquired by the body through ingestion, endogenous neurotoxins both originate from and exert their effects in-vivo. Adicionalmente, though most venoms and exogenous neurotoxins will rarely possess useful in-vivo capabilities, endogenous neurotoxins are commonly used by the body in useful and healthy ways, such as nitric oxide which is used in cell communication.[111] It is often only when these endogenous compounds become highly concentrated that they lead to dangerous effects.[10] Nitric oxide Though nitric oxide (NO) is commonly used by the nervous system in inter-neuron communication and signaling, it can be active in mechanisms leading to ischemia in the cerebrum (Iadecola 1998). The neurotoxicity of NO is based on its importance in glutamate excitotoxicity, as NO is generated in a calcium-dependent manner in response to glutamate mediated NMDA activation, which occurs at an elevated rate in glutamate excitotoxicity.[47] Though NO facilitates increased blood flow to potentially ischemic regions of the brain, it is also capable of increasing oxidative stress,[112] inducing DNA damage and apoptosis.[113] Thus an increased presence of NO in an ischemic area of the CNS can produce significantly toxic effects. Glutamate Glutamate, like nitric oxide, is an endogenously produced compound used by neurons to perform normally, being present in small concentrations throughout the gray matter of the CNS.[10] One of the most notable uses of endogenous glutamate is its functionality as an excitatory neurotransmitter.[48] When concentrated, sin embargo, glutamate becomes toxic to surrounding neurons. This toxicity can be both a result of direct lethality of glutamate on neurons and a result of induced calcium flux into neurons leading to swelling and necrosis.[48] Support has been shown for these mechanisms playing significant roles in diseases and complications such as Huntington’s disease, epilepsia, and stroke.[10] See also Antibodies Drug interactions Insecticides Kainic acid Neurotoxicity Teratogenesis, many birth defects are essentially caused by neurotoxicity in developing neurons Penitrem A Toxic disorders Toxicity NotesSivonen K (1999 ↑ Scottish Government 2011 ↑ Online Etymological Dictionary: Neuro- ↑ Online Etymological Dictionary: ToxicJump up to: 5.0 5.1 Spencer 2000 ↑ Jump up to: 6.0 6.1 Olney 2002 ↑ Jump up to: 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Kiernan 2005 ↑ Lidsky 2003 ↑ Jump up to: 9.0 9.1 9.2 Heaton 2000 ↑ Jump up to: 10.0 10.1 10.2 10.3 Choi 1987 ↑ Zhang 1994 ↑ Jump up to: 12.0 12.1 Rosales 1996 ↑ Jump up to: 13.0 13.1 simpson 1986 ↑ Jump up to: 14.0 14.1 14.2 Arnon 2001 ↑ Dikranian 2001 ↑ Deng 2003 ↑ Jevtovic-Todorovic 2003 ↑ Nadler 1978 ↑ Jump up to: 19.0 19.1 19.2 19.3 Thyagarajan 2009 ↑ Jump up to: 20.0 20.1 Takadera 1990 ↑ Hodge 2002 ↑ Jump up to: 22.0 22.1 Dobbs 2009 ↑ Jump up to: 23.0 23.1 23.2 Widmaier 2008 ↑ Jump up to: 24.0 24.1 Martini 2009 ↑ Jump up to: 25.0 25.1 Costa 2011 ↑ Harry 1998 ↑ Gartlon 2006 ↑ Mundy 2008 ↑ Lotti 2005 ↑ Jump up to: 30.0 30.1 30.2 Adams 2003 ↑ Jump up to: 31.0 31.1 Brocardo 2011 ↑ Lewendon 2001 ↑ Jump up to: 33.0 33.1 Haghdoost-Yazdi 2011 ↑ Jump up to: 34.0 34.1 DeBin 1993 ↑ Jump up to: 35.0 35.1 Koller 1988 ↑ McClesky 1987 ↑ Jump up to: 37.0 37.1 Garcia-Rodriguez 2011 ↑ Jump up to: 38.0 38.1 Williamson 1996 ↑ Jump up to: 39.0 39.1 39.2 Dutrere 2006 ↑ Jump up to: 40.0 40.1 Banks 1988 ↑ Jump up to: 41.0 41.1 41.2 Aschner 1990 ↑ Jump up to: 42.0 42.1 DeFuria 2006 ↑ Jump up to: 43.0 43.1 Konopacka 2009 ↑ Jump up to: 44.0 44.1 44.2 Bressler 1999 ↑ Jump up to: 45.0 45.1 Lovinger 1989 ↑ Jump up to: 46.0 46.1 Leonard 1986 ↑ Jump up to: 47.0 47.1 Garthwaite 1988 ↑ Jump up to: 48.0 48.1 48.2 Choi 1990 ↑ Jump up to: 49.0 49.1 49.2 Chowdhury 2007 ↑ Ahasan 2004 ↑ Lau 1995 ↑ Jump up to: 52.0 52.1 52.2 Standfield 1983 ↑ Roed 1989 ↑ Haghdoost-Yasdi 2011 ↑ Deshane 2003 ↑ Soroceanu 1998 ↑ Jump up to: 57.0 57.1 Bisset 1992 ↑ Schlesinger 1946 ↑ Griffith 1942 ↑ Jump up to: 60.0 60.1 jacob 2010 ↑ Olivera 1987 ↑ Cruz 1986 ↑ McCleskey 1987 ↑ Jump up to: 64.0 64.1 Brin 1998 ↑ Montecucco 1986 ↑ Jump up to: 66.0 66.1 Pirazzini 2011 ↑ Rey 1981 ↑ Rabe 1982 ↑ Walton 2006 ↑ Chan 2011 ↑ Brookes 1988 ↑ Tsetlin 2003 ↑ Jump up to: 73.0 73.1 Liu 2008 ↑ Hue 2007 ↑ Carmichael 1978 ↑ Carmichael 1975 ↑ Yang 2007 ↑ Madera 2007 ↑ National Center for Environmental AssessmentDevlin 1977 ↑ Moore 1977 ↑ Metcalf 2009 ↑ Stewart 2008 ↑ Dixit 2005 ↑ Liu 2009 ↑ Vahidnia 2007 ↑ Jump up to: 87.0 87.1 87.2 Rocha 2011 ↑ Brender 2005 ↑ DeFuria 2007 ↑ Jump up to: 90.0 90.1 Matsuoka 1991 ↑ Buzanska (2000) ↑ Jump up to: 92.0 92.1 Norenberg 2004 ↑ Jump up to: 93.0 93.1 Lidskey 2003 ↑ Bradbury 1993 ↑ Lasley 1999 ↑ Baum-Baicker 1985 ↑ Taffe 2010 ↑ Morris 2009 ↑ Bleich 2003 ↑ Blanco 2005 ↑ Davis 1992 ↑ Bernier 2011 ↑ Jones 1973 ↑ Mitchell 1999 ↑ Gil-Mohapel 2010 ↑ Bergamini 2004 ↑ Workers poisoned while making iPhones ABC News, Octubre 25, 2010 ↑ Dirty Secrets ABC Foreign Correspondent, 2010-Oct-26Mr Daisey and the Apple Factory, This American Life, Enero 6, 2012 ↑ Occupational Safety and Health Guideline for n-Hexane, OSHA.govIadecola 1998 ↑ Beckman 1990 ↑ Bonfoco 1995 References Adams, Michael E., and Baldomero M. 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Ciencia, 263 (5147): 687–89.  Further reading Brain Facts Book at The Society for Neuroscience Neuroscience Texts at University of Texas Medical School In Vitro Neurotoxicology: Una introducción[enlace muerto] at Springerlink Biology of the NMDA Receptor at NCBI Advances in the Neuroscience of Addiction, 2nd edition at NCBI External links Wikimedia Commons has media related to: [[Commons: Categoría:Neurotoxins | Neurotoxins ]] Environmental Protection Agency at United States Environmental Protection Agency Alcohol and Alcoholism at Oxford Medical Journals Neurotoxicology at Elsevier Journals Neurotoxin Institute at Neurotoxin Institute Neurotoxins at Toxipedia v·d·e Neurotoxins Animal Batrachotoxin Bestoxin Birtoxin Bungarotoxin Charybdotoxin Conotoxin Saxitoxin Tetrodotoxin Vanillotoxin Huwentoxin Sea anemone neurotoxin Bacterial Botulinum toxin Tetanospasmin Plant Penitrem A Picrotoxin Bicuculline Pesticides Rotenone Nerve agents Cyclosarin EA-3148 Novichok agent Sarin Soman Tabun VE VG VM VR VX Neurotransmitters and precursors Dopamine Glutamate L-Tyrosine L-Phenylalanine L-DOPA (Levodopa) L-Glutamine Neurotoxic drugs 1,4-BD 5,7-DHT 6-OHDA αhora del Este αMT Amphetamine Dizocilpine (MK-801) DSP-4 Ethanol GBL GHB Ibotenic acid Ketamine Lisdexamfetamine Methamphetamine MBDB MDA MDEA MDMA (Éxtasis) MPP+ MPTP Norsalsolinol PBA PCA PIA Phencyclidine (PCP) Denaturants Methanol v·d·e Neuroscience Affective neuroscience· Behavioral neurology· Behavioral genetics· Behavioral neuroscience· Cerebro–computer interface· Chronobiology· Clinical neurophysiology· Clinical neuroscience· Cognitive neuroscience· Neurociencia computacional· Connectomics· Educational neuroscience· Evolution of nervous systems· Imaging genetics· Integrative neuroscience· Molecular cellular cognition· Neural development· Neural engineering· Neural network (tanto artificiales como biologicos) · Neuroanatomía· Neurobioengineering· Neurobiology· Neurobiotics· Neurocardiology· Neurochemistry· Neurochip· Neurodegeneration· Neurodevelopmental disorders· Neurodiversity· Neuroeconomics· Neuroembryology· Neuroendocrinology· Neuroepidemiology· Neuroethics· Neuroethology· Neurogastroenterology· Neurogenetics· Neuroimaging· Neuroimmunology· Neuroinformática· Neurointensive care· Neurolinguistics· Neurología· Neurometría· Neuromodulation· Neuromonitoring· Neurooncology· Neuro-ophthalmology· Neuropathology· Neurofarmacología· Neurophilosophy· Neurophysics· Neurophysiology· Neuroplasticity· Neuroprosthetics· Neurosiquiatría· Neuropsicología· Neuroradiology· Neuroregeneration· Neurorehabilitation· Neurorobotics· Neurocirugía· Neurotechnology· Neurotology· Neurotoxin· Neurotransmitter· Neurovirology· Psiquiatría· Sensory neuroscience· neurociencia social· Systems neuroscience 130px * Plantilla:Plantilla de libro de iconos:Icon Category Commons v·d·e Toxins (enterotoxin·neurotoxin·hemotoxin·cardiotoxin·phototoxin) Bacterial toxins Exotoxin Gram positive Bacilli Clostridium: tetani (Tetanospasmin) · perfringens (Alpha toxin, Enterotoxin) · difficile (Un, B) · botulinum (Botox) otro: Anthrax toxin· Listeriolysin O Cocci Streptolysin· Leukocidin (Panton-Valentine leukocidin) · Staphylococcus (Staphylococcus aureus alpha/beta/delta, Exfoliatin, Toxic shock syndrome toxin, SEB) Actinobacteria Cord factor· Diphtheria toxin Gram negative Shiga toxin· Verotoxin/shiga-like toxin (E. coli) · E. coli heat-stable enterotoxin/enterotoxin· Cholera toxin· Pertussis toxin· Pseudomonas exotoxin· Extracellular adenylate cyclase Mechanisms type I (Superantigen) · type II (Pore-forming toxin) · type III (AB toxin/AB5) Endotoxin Lipopolysaccharide (Lipid A) · Bacillus thuringiensis delta endotoxin Virulence factor Clumping factor A· Fibronectin binding protein A Mycotoxins Aflatoxin· Amatoxin (alpha-amanitin, beta-amanitin, gamma-amanitin, epsilon-amanitin) · Citrinin· Cytochalasin· Ergotamine· Fumonisin (Fumonisin B1, Fumonisin B2) · Gliotoxin· Ibotenic acid· Muscimol· Ochratoxin· Patulin· Phalloidin· Sterigmatocystin· Trichothecene· Vomitoxin· Zeranol· Zearalenone Invertebrates arthropod: scorpion: Charybdotoxin, Maurotoxin, Agitoxin, Margatoxin, Slotoxin, Scyllatoxin, Hefutoxin, Lq2, Birtoxin, Bestoxin, BmKAEP, Phaiodotoxin, Imperatoxin· spider: Latrotoxin (Alpha-latrotoxin) · PhTx3· Stromatoxin· Vanillotoxin· Huwentoxin mollusca: Conotoxin· Eledoisin· Onchidal· Saxitoxin· Tetrodotoxin Vertebrates fish: Ciguatera· Tetrodotoxin amphibian: (+)-Allopumiliotoxin 267A· Batrachotoxin· Bufotoxins (Arenobufagin, Bufotalin, Bufotenin· Cinobufagin, Marinobufagin) · Epibatidine· Histrionicotoxin· Pumiliotoxin 251D· Samandarin· Samandaridine· Tarichatoxin reptile/snake venom: Bungarotoxin (Alpha-Bungarotoxin, Beta-Bungarotoxin) · Calciseptine· Taicatoxin· Calcicludine· Cardiotoxin III note: some toxins are produced by lower species and pass through intermediate species Template:Toxicology navs This page uses Creative Commons Licensed content from Wikipedia (ver autores).

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