L-Leucine
Leucine (Leu) or L-leucine is an alpha-amino acid. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). Amino acids are organic compounds that contain amino (‚ÄìNH2) and carboxyl (‚ÄìCOOH) functional groups, along with a side chain (R group) specific to each amino acid. L-leucine is one of 20 proteinogenic amino acids, i.e., the amino acids used in the biosynthesis of proteins. Leucine is found in all organisms ranging from bacteria to plants to animals. It is classified as a non-polar, uncharged (at physiological pH) aliphatic amino acid. Leucine is essential in humans, meaning the body cannot synthesize it, and it must be obtained from the diet. Human dietary sources are foods that contain protein, such as meats, dairy products, soy products, beans and legumes. L-Leucine is a branched chain amino acid (BCAA). The BCAAs consist of leucine, valine and isoleucine (and occasionally threonine). BCAAs are essential amino acids whose carbon structure is marked by a branch point at the beta-carbon position. BCAAs are critical to human life and are particularly involved in stress, energy and muscle metabolism. BCAA supplementation as therapy, both oral and intravenous, in human health and disease holds great promise. BCAAs have different metabolic routes, with valine going solely to carbohydrates (glucogenic), leucine solely to fats (ketogenic) and isoleucine being both a glucogenic and a ketogenic amino acid. The different metabolism accounts for different requirements for these essential amino acids in humans: 12 mg/kg, 14 mg/kg and 16 mg/kg of valine, leucine and isoleucine respectively. The primary metabolic end products of leucine metabolism are acetyl-CoA and acetoacetate; consequently, it is one of the two exclusively ketogenic amino acids, with lysine being the other. Leucine is the most important ketogenic amino acid in humans. The vast majority of l-leucine metabolism is initially catalyzed by the branched-chain amino acid aminotransferase enzyme, producing alpha-ketoisocaproate (alpha-KIC). alpha-KIC is metabolized by the mitochondrial enzyme branched-chain alpha-ketoacid dehydrogenase, which converts it to isovaleryl-CoA. Isovaleryl-CoA is subsequently metabolized by the enzyme isovaleryl-CoA dehydrogenase and converted to beta-methylcrotonyl-CoA (MC-CoA), which is used in the synthesis of acetyl-CoA and other compounds. During biotin deficiency, HMB can be synthesized from MC-CoA via enoyl-CoA hydratase and an unknown thioesterase enzyme, which convert MC-CoA into HMB-CoA and HMB-CoA into HMB respectively. Leucine has the capacity to directly stimulate myofibrillar muscle protein synthesis (PMID 15051860). This effect of leucine arises results from its role as an activator of the mechanistic target of rapamycin (mTOR) (PMID 23551944) a serine-threonine protein kinase that regulates protein biosynthesis and cell growth. The activation of mTOR by leucine is mediated through Rag GTPases. Leucine, like other BCAAs, is associated with insulin resistance. In particular, higher levels of leucine are observed in the blood of diabetic mice, rats, and humans (PMID 25287287). BCAAs such as leucine have different deficiency symptoms. Valine deficiency is marked by neurological defects in the brain, while isoleucine deficiency is marked by muscle tremors. Persistently low leucine levels can result in decreased appetite, poor feeding, lethargy, poor growth, weight loss, skin rashes, hair loss, and desquamation. Many types of inborn errors of BCAA metabolism exist and these are marked by various abnormalities. The most common form is maple syrup urine disease, marked by a characteristic urinary odor. Other abnormalities are associated with a wide range of symptoms, such as mental retardation, ataxia, hypoglycemia, spinal muscle atrophy, rash, vomiting and excessive muscle movement. Most forms of BCAA metabolism errors are corrected by dietary res... L-leucine is the L-enantiomer of leucine. It has a role as a plant metabolite, an Escherichia coli metabolite, a Saccharomyces cerevisiae metabolite, a human metabolite, an algal metabolite and a mouse metabolite. It is a pyruvate family amino acid, a proteinogenic amino acid, a leucine and a L-alpha-amino acid. It is a conjugate base of a L-leucinium. It is a conjugate acid of a L-leucinate. It is an enantiomer of a D-leucine. It is a tautomer of a L-leucine zwitterion. An essential branched-chain amino acid important for hemoglobin formation. L-Leucine is a metabolite found in or produced by Escherichia coli (strain K12, MG1655). Leucine is one of nine essential amino acids in humans (provided by food), Leucine is important for protein synthesis and many metabolic functions. Leucine contributes to regulation of blood-sugar levels; growth and repair of muscle and bone tissue; growth hormone production; and wound healing. Leucine also prevents breakdown of muscle proteins after trauma or severe stress and may be beneficial for individuals with phenylketonuria. Leucine is available in many foods and deficiency is rare. (NCI04) Leucine (abbreviated as Leu or L)[2] is a branched-chain л±-amino acid with the chemical formulaHO2CCH(NH2)CH2CH(CH3)2. Leucine is classified as a hydrophobic amino acid due to its aliphatic isobutyl side chain. It is encoded by six codons (UUA, UUG, CUU, CUC, CUA, and CUG) and is a major component of the subunits in ferritin, astacin, and other buffer proteins. Leucine is an essential amino acid, meaning that the human body cannot synthesize it, and it therefore must be ingested. It is important for hemoglobin formation. An essential branched-chain amino acid important for hemoglobin formation. See also: Isoleucine; Leucine (component of) ... View More ... Dietary supplement, nutrient [DFC]. (±)-Leucine is found in many foods, some of which are green bell pepper, italian sweet red pepper, green zucchini, and red bell pepper. L-Leucine. CAS Common Chemistry. CAS, a division of the American Chemical Society, n.d. https://commonchemistry.cas.org/detail?cas_rn=61-90-5 (retrieved 2024-07-01) (CAS RN: 61-90-5). Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0). L-Leucine is an essential branched-chain amino acid (BCAA), which activates the mTOR signaling pathway[1]. L-Leucine is an essential branched-chain amino acid (BCAA), which activates the mTOR signaling pathway[1]. L-Leucine is an essential branched-chain amino acid (BCAA), which activates the mTOR signaling pathway[1]. L-Leucine is an essential branched-chain amino acid (BCAA), which activates the mTOR signaling pathway[1].
Pachymic_acid
Pachymic acid is a triterpenoid. Pachymic acid is a natural product found in Rhodofomitopsis feei, Rhodofomitopsis lilacinogilva, and other organisms with data available. See also: Smilax china root (part of). D004791 - Enzyme Inhibitors > D064801 - Phospholipase A2 Inhibitors Pachymic acid is a lanostrane-type triterpenoid from P. cocos. Pachymic acid inhibits Akt and ERK signaling pathways. Pachymic acid is a lanostrane-type triterpenoid from P. cocos. Pachymic acid inhibits Akt and ERK signaling pathways. Pachymic acid is a lanostrane-type triterpenoid from P. cocos. Pachymic acid inhibits Akt and ERK signaling pathways.
Harpagoside
Harpagoside is a terpene glycoside. Harpagoside is a natural product found in Verbascum lychnitis, Verbascum sinuatum, and other organisms with data available. See also: Harpagophytum procumbens root (part of); Harpagophytum zeyheri root (part of). Origin: Plant; SubCategory_DNP: Monoterpenoids, Iridoid monoterpenoids Harpagoside is isolated from Harpagophytum procumbens. Harpagoside has inhibitory effects on COX-1 and COX-2 activity and inhibits NO production[1]. Harpagoside is isolated from Harpagophytum procumbens. Harpagoside has inhibitory effects on COX-1 and COX-2 activity and inhibits NO production[1].
2,4-Toluenediamine
2,4-toluenediamine belongs to the family of Toluenes. These are compounds containing a benzene ring which bears a methane group. D009676 - Noxae > D002273 - Carcinogens D009676 - Noxae > D009153 - Mutagens
2-Methoxy-5-methylaniline
CONFIDENCE standard compound; INTERNAL_ID 745; DATASET 20200303_ENTACT_RP_MIX500; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 5210; ORIGINAL_PRECURSOR_SCAN_NO 5208 CONFIDENCE standard compound; INTERNAL_ID 745; DATASET 20200303_ENTACT_RP_MIX500; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 5226; ORIGINAL_PRECURSOR_SCAN_NO 5223 CONFIDENCE standard compound; INTERNAL_ID 745; DATASET 20200303_ENTACT_RP_MIX500; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 5212; ORIGINAL_PRECURSOR_SCAN_NO 5211 CONFIDENCE standard compound; INTERNAL_ID 745; DATASET 20200303_ENTACT_RP_MIX500; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 5203; ORIGINAL_PRECURSOR_SCAN_NO 5201 CONFIDENCE standard compound; INTERNAL_ID 745; DATASET 20200303_ENTACT_RP_MIX500; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 5197; ORIGINAL_PRECURSOR_SCAN_NO 5194 CONFIDENCE standard compound; INTERNAL_ID 745; DATASET 20200303_ENTACT_RP_MIX507; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 5219; ORIGINAL_PRECURSOR_SCAN_NO 5218 CONFIDENCE Reference Standard (Level 1); INTERNAL_ID 1002
3,3'-Dimethylbenzidine
CONFIDENCE standard compound; INTERNAL_ID 2434
Rivastigmine
Rivastigmine is only found in individuals that have used or taken this drug. It is a parasympathomimetic or cholinergic agent for the treatment of mild to moderate dementia of the Alzheimers type. Rivastigmine is a cholinesterase inhibitor that inhibits both butyrylcholinesterase and acetylcholinesterase.Rivastigmine is a carbamate derivative that is structurally related to physostigmine, but not to donepezil and tacrine. The precise mechanism of rivastigmine has not been fully determined, but it is suggested that rivastigmine binds reversibly with and inactivates chlolinesterase (eg. acetylcholinesterase, butyrylcholinesterase), preventing the hydrolysis of acetycholine, and thus leading to an increased concentration of acetylcholine at cholinergic synapses. The anticholinesterase activity of rivastigmine is relatively specific for brain acetylcholinesterase and butyrylcholinesterase compared with those in peripheral tissues. D018377 - Neurotransmitter Agents > D018678 - Cholinergic Agents > D002800 - Cholinesterase Inhibitors N - Nervous system > N06 - Psychoanaleptics > N06D - Anti-dementia drugs > N06DA - Anticholinesterases D002491 - Central Nervous System Agents > D018696 - Neuroprotective Agents C471 - Enzyme Inhibitor > C47792 - Acetylcholinesterase Inhibitor CONFIDENCE standard compound; EAWAG_UCHEM_ID 2844 EAWAG_UCHEM_ID 2844; CONFIDENCE standard compound D020011 - Protective Agents D004791 - Enzyme Inhibitors
N-NITROSOMORPHOLINE
CONFIDENCE standard compound; EAWAG_UCHEM_ID 3454 CONFIDENCE standard compound; INTERNAL_ID 4127 CONFIDENCE standard compound; INTERNAL_ID 8689 D009676 - Noxae > D002273 - Carcinogens D009676 - Noxae > D009153 - Mutagens
7alpha-Hydroxycholesterol
7alpha-Hydroxycholesterol is an oxysterol and can serve as a biomarker for lipid peroxidation (PMID: 17386651). Products of cholesterol oxidation accumulate within atherosclerotic plaque and have been proposed to contribute to inflammatory signalling in the diseased artery (PMID: 17364953). 7alpha-Hydroxycholesterol is a cholesterol oxide that has been described as a biomarker of oxidative stress in subjects with impaired glucose tolerance and diabetes (PMID: 16634125). 7alpha-Hydroxycholesterol has been identified in the human placenta (PMID: 32033212). 7alpha-hydroxycholesterol is an oxysterol and can serve as a biomarker for lipid peroxidation. (PMID: 17386651) Products of cholesterol oxidation accumulate within atherosclerotic plaque and have been proposed to contribute to inflammatory signalling in the diseased artery. (PMID: 17364953) 7α-Hydroxycholesterol is a cholesterol oxide and is formed by both enzymatic and non-enzymatic oxidation. 7α-Hydroxycholesterol can be used as a biomarker for lipid peroxidation[1][2].
Methylamine
Methylamine occurs endogenously from amine catabolism and its tissue levels increase in some pathological conditions, including diabetes. Interestingly, methylamine and ammonia levels are reciprocally controlled by a semicarbazide-sensitive amine oxidase activity that deaminates methylamine to formaldehyde with the production of ammonia and hydrogen peroxide. Methylamine also targets the voltage-operated neuronal potassium channels, probably inducing release of neurotransmitter(s). Semicarbazide-sensitive amine oxidase (SSAO) catalyzes the deamination of primary amines. Such deamination has been shown capable of regulating glucose transport in adipose cells. It has been independently discovered that the primary structure of vascular adhesion protein-1 (VAP-1) is identical to SSAO. Increased serum SSAO activities have been found in patients with diabetic mellitus, vascular disorders, and Alzheimers disease. The SSAO-catalyzed deamination of endogenous substrates like methylamine led to production of toxic formaldehyde. Chronic elevated methylamine increases the excretion of malondialdehyde and microalbuminuria. Amine oxidase substrates such as methylamine have been shown to stimulate glucose uptake by increasing the recruitment of the glucose transporter GLUT4 from vesicles within the cell to the cell surface. Inhibition of this effect by the presence of semicarbazide and catalase led to the suggestion that the process is mediated by the hydrogen peroxide produced in the oxidation of these amines (PMID: 16049393 , 12686132 , 17406961). Methylamine has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821). Methylamine is a colourless gas derivative of ammonia, but with one H atom replaced by a methyl group. It is the simplest primary amine. It has a strong odor similar to fish. Methylamine is used as a building block for the synthesis of many other commercially available compounds. Hundreds of millions of kilograms are produced annually. Methylamine is found in many foods, some of which are french plantain, tea, barley, and wild celery.
P-Dichlorobenzene
1,4-Dichlorobenzene (p-DCB, para-dichlorobenzene) is an organic compound with the formula C6H4Cl2. This colorless solid has a strong odor. In terms of its structure, the molecule consists of two chlorine atoms substituted for hydrogen at opposing sites on a benzene ring. p-DCB is used a pesticide and a deodorant, most familiarly in mothballs in which it is a replacement for the more traditional naphthalene. p-DCB is also used as a precursor in the production of the polymer poly(p-phenylene sulfide). D010575 - Pesticides > D007306 - Insecticides D009676 - Noxae > D002273 - Carcinogens D016573 - Agrochemicals
Probucol
Probucol is only found in individuals that have used or taken this drug. It is a drug used to lower LDL and HDL cholesterol yet has little effect on serum-triglyceride or VLDL cholesterol. (From Martindale, The Extra Pharmacopoeia, 30th ed, p993).Probucol lowers serum cholesterol by increasing the fractional rate of low-density lipoprotein (LDL) catabolism in the final metabolic pathway for cholesterol elimination from the body. Additionally, probucol may inhibit early stages of cholesterol biosynthesis and slightly inhibit dietary cholesterol absorption. Recent information suggests that probucol may inhibit the oxidation and tissue deposition of LDL cholesterol, thereby inhibiting atherogenesis. It appears to inhibits ABCA1-mediated cellular lipid efflux. D057847 - Lipid Regulating Agents > D000960 - Hypolipidemic Agents > D000924 - Anticholesteremic Agents C - Cardiovascular system > C10 - Lipid modifying agents > C10A - Lipid modifying agents, plain C78276 - Agent Affecting Digestive System or Metabolism > C29703 - Antilipidemic Agent D020011 - Protective Agents > D000975 - Antioxidants D009676 - Noxae > D000963 - Antimetabolites
2-Nitrofluorene
D004785 - Environmental Pollutants > D000393 - Air Pollutants D009676 - Noxae > D009153 - Mutagens
Calcein AM
D019995 - Laboratory Chemicals > D007202 - Indicators and Reagents > D049408 - Luminescent Agents D004396 - Coloring Agents > D005456 - Fluorescent Dyes > D005452 - Fluoresceins D000970 - Antineoplastic Agents
Methyl 4-(2-benzylbenzoyl)-2,5-dimethyl-1H-pyrrole-3-carboxylate
D002317 - Cardiovascular Agents > D014662 - Vasoconstrictor Agents > D002120 - Calcium Channel Agonists D000077264 - Calcium-Regulating Hormones and Agents D049990 - Membrane Transport Modulators
7-Hydroxycholesterol
METHYLAMINE
The simplest of the methylamines, consisting of ammonia bearing a single methyl substituent.
RIVASTIGMINE
D018377 - Neurotransmitter Agents > D018678 - Cholinergic Agents > D002800 - Cholinesterase Inhibitors N - Nervous system > N06 - Psychoanaleptics > N06D - Anti-dementia drugs > N06DA - Anticholinesterases D002491 - Central Nervous System Agents > D018696 - Neuroprotective Agents C471 - Enzyme Inhibitor > C47792 - Acetylcholinesterase Inhibitor D020011 - Protective Agents D004791 - Enzyme Inhibitors
2,4-Diaminotoluene
An aminotoluene that is para-toluidine with an additional amino group at position 2. D009676 - Noxae > D002273 - Carcinogens D009676 - Noxae > D009153 - Mutagens
1,4-DICHLOROBENZENE
D010575 - Pesticides > D007306 - Insecticides D009676 - Noxae > D002273 - Carcinogens D016573 - Agrochemicals
N-NITROSOMORPHOLINE
D009676 - Noxae > D002273 - Carcinogens D009676 - Noxae > D009153 - Mutagens
probucol
D057847 - Lipid Regulating Agents > D000960 - Hypolipidemic Agents > D000924 - Anticholesteremic Agents C - Cardiovascular system > C10 - Lipid modifying agents > C10A - Lipid modifying agents, plain C78276 - Agent Affecting Digestive System or Metabolism > C29703 - Antilipidemic Agent D020011 - Protective Agents > D000975 - Antioxidants D009676 - Noxae > D000963 - Antimetabolites
2-Nitrofluorene
D004785 - Environmental Pollutants > D000393 - Air Pollutants D009676 - Noxae > D009153 - Mutagens
Calcein AM
D019995 - Laboratory Chemicals > D007202 - Indicators and Reagents > D049408 - Luminescent Agents D004396 - Coloring Agents > D005456 - Fluorescent Dyes > D005452 - Fluoresceins D000970 - Antineoplastic Agents
