acetaldehyde health effects

London: Taylor & Francis. h��Yko��+��Fa���H�m�i��r�?���%A������{w��J��h�jvg�q���k� �8[L荋�oz�M&dP4�������>�j�{A��^M���h��d�3�wx����|�]w|��;Y^�;���.���� >��>��X]_�����7��`k�t/o���,�]bg�����������~6?8�����7wW��C㺳C������~�]v/~[�:[/���|a������>9�X^�W��O�7�������Ë�˧�٧�۫�G|6V�ޟ�Ź���g˵�������ru�����x���`��W��{D�����fϒ���8_��6��/WW�������ba������^���j�/�K����e����__��N׋����������l����Ԥ*�P�q��]��u?�E��8Z�/9���SA�����/7�0����ۛW��?,n�����=���nIo䔳O�dS9�����3;ˑ����"�M�WJt�l���G�P�5�ؘ���֜�Pۇk4 Forty percent of Asians have an ALDH gene, which codes for a low activity ALDH enzyme. This is due to the effect harman, one of the reaction products of acetaldehyde, on the brain. IARC has identified acetaldehyde as a carcinogen for human beings, primarily responsible for esophageal cancer.1, In addition to acetaldehyde generation from ethanol in various tissues, acetaldehyde can also be formed from ethanol via bacterial oxidation in the mouth, stomach, and colon.55 Bacterial acetaldehyde production may be of special importance in upper gastrointestinal cancer and in the colon, where acetaldehyde may act as a carcinogen. Van Vleet, B.K. acetaldehyde among those who consume alcoholic beverages. 34,35 Ethanol can be metabolized to acetaldehyde … 1988; Heck et al. Its mood-improving effect can thus increase dependence on smoking. One of the side effects caused by acetaldehyde include vomiting. As a result, acetaldehyde leads to the failure of DNA repair, mitochondrial abnormalities, impairment of microtubular function, and failure of the cell membrane. Acetaldehyde is highly reactive and toxic. Tao Zeng PhD, Ke-Qin Xie PhD, in Molecular Aspects of Alcohol and Nutrition, 2016. Acetaldehyde is a substance that is produced in the human body during metabolic processes, for example when the body breaks down alcohol. 1977; White et al. Acetaldehyde, produced from the metabolism of ethanol, may also be responsible for localized cancers, brain damage in prenatal infants, and growth suppression (in chicken embryos). J.R. Kuykendall, in Comprehensive Toxicology, 2010. Acetaldehyde produced by ADH and MEOS contributes to the many features seen in acute AH. During ethanol oxidation, AcH was detectable in blood from the hepatic vein of normal subjects ingesting ethanol, suggesting that a substantial AcH gradient exists in the vascular system (Eriksson and Fukunaga 1993). On the contrary, FA was found at appreciable levels (∼80 μmol l−1) in the blood of unexposed rats, monkeys, and humans (Section (Casanova et al. 0 The concentration difference between the hepatic vein and peripheral veins may be as large as 50 μmol l−1, implying rapid AcH elimination from the blood. Most acetaldehyde is oxidized by ALDH2. AcH is produced from threonine in mammals by the enzyme threonine aldolase, which converts threonine to glycine and AcH (Harper et al. Chronic alcohol consumption results in high levels of acetaldehyde, which is highly toxic due to a variety of mechanisms including glutathione depletion, oxidative stress, lipid peroxidation and the formation of adducts with proteins.140, Helmut K. Seitz MD, PhD, Sebastian Mueller MD, PhD, in Molecular Aspects of Alcohol and Nutrition, 2016, Acetaldehyde, the first metabolite of ethanol oxidation, is mutagenic and carcinogenic in animal experiments. Classes of aldehyde dehydrogenase isoenzymes. Only a small proportion is exhaled unchanged. This substance often occurs in nature as a chemical by-product in plants and in many organisms. Acetaldehyde is highly toxic but is rapidly converted to acetate. AcH is produced from naturally occurring compounds as well as from xenobiotics, most notably ethanol. We use cookies to help provide and enhance our service and tailor content and ads. 95–129. Ultimately acetaldehyde is cytotoxic, and can also cause major damage to the organ within the body. Acetaldehyde can also indirectly make cigarettes more attractive. Acute (short-term) exposure to acetaldehyde results in effects including irritation of the eyes, skin, and respiratory tract. It is assumed that harman has an effect similar to that of antidepressants on a person’s mood. This makes acetaldehyde one of the main components of cigarette smoke (after tar, nicotine and carbon monoxide). Ethanol and the Liver. Acetaldehyde is ubiquitously present and increased levels are associated with neurological pathologies such as stroke, Wernike encephalopathy, and Alzheimer disease, as well as alcohol-induced impairment of brain structure and function. It is ubiquitous in the environment and may be formed in the body from the breakdown of ethanol. }oJ�^k"x*�@�D��'��}4=b�;gR����$�G0�l"��r��>ٯz� Xk"��I6�䙭���$��@��6f�)��|�����#����k?�r˜9. 1985). Acetaldehyde forms stable adducts with amino acid residues in proteins. After intravenous injection, the half-life in the blood is approximately 90 seconds. T.R. Acetaldehyde has a molecular formula of C2H4O. Acetaldehyde can also cause headaches. As ADH is not physiologically active in the brain, the CYP2E1 should play important roles in the conversion of ethanol to acetaldehyde in the rodent brains.35 Therefore, the CYP2E1 gene polymorphisms may influence individual susceptibility to AD by altering the metabolism of ethanol to acetaldehyde in the brain. %%EOF The half-life of AcH in the blood of rats after inhalation exposure was approximately 3 min (Hobara et al. Metabolic or autoxidation pathways lead to the formation of endogenous acetaldehyde, and a large number of genes function in the metabolic detoxication of acetaldehyde. Vinyl acetate is carcinogenic in rats at high concentrations, and a role for AcH in this response has been proposed (Bogdanffy et al. 1985), due to its rapid metabolism. When taken up by the organism, acetaldehyde is metabolized rapidly in the liver to acetic acid. M. Shimada, ... A. Sanyal, in Pathobiology of Human Disease, 2014. List of known side effects. It is noteworthy that the generation of this mutagenic DNA adduct is facilitated in hyperregenerative tissue, such as the gastrointestinal mucosa, since polyamines are triggers for cell regeneration. The threshold limit value is 25ppm (STEL/ceiling value) and the MAK (Maximum Workplace Concentration) is 50 ppm. The compound can lead to un-coordination, memory impairment and sleepiness. More toxicological studies and risk assessment on acetaldehyde are required. The accumulation of acetaldehyde may account for the flushing seen with alcohol consumption in heterozygotes. Acetaldehyde is the proximate metabolite generated by ethanol metabolism by liver ADHs, CYP2E1 originally referred to as the microsomal ethanol oxidizing system (MEOS), and catalase pathways. Acetaldehyde is an extremely reactive compound and a pure preparation of the chemical boils at room temperature. 1985). Acetaldehyde has been demonstrated to play important roles in the pathogenesis of AD. Furthermore, acetaldehyde increases lipid peroxidation with concomitant production of oxygen free radicals and reduces glutathione. Acetaldehyde DNA adducts have been observed in the lymphocytes of human alcohol abusers. These adducts are antigenic, giving rise to anti-adduct antibodies that can react with hepatocyte surface antigens causing the destruction of liver cells. In addition, deoxyribose 5-phosphate is converted to AcH and glyceraldehyde 3-phosphate during catabolism of DNA by deoxyriboaldolase (Kornberg 1980; Metzler 1977). Acetaldehyde-protein adducts initiate the formation of neo-antigens. There are several isoenzymes of ALDH (Table 6). (1) Assessing Personal Exposure Acetaldehyde can be detected in the blood and breath to determine whether or not exposure has occurred. In addition, the amount of acetaldehyde generated is genetically determined through oxidation by various alcohol dehydrogenases (ADHs) and through its detoxification by acetaldehyde dehydrogenases (ALDHs). Also, depending on a persons genes, acetaldehyde can promote alcoholism. Substance name: Acetaldehyde CASR number: 75-07-0 Molecular formula: C2H4O Synonyms: Ethanal; ethyl aldehyde; acetic aldehyde; aldehyde; acetylaldehyde; aldehyde acetic aldehyde, NCI-C56326, RCRA waste number U001, UN 1089. 1985). Acetaldehyde causes irritation of the airways, and has been classed as a possible cancer-causing agent by the expert cancer organisation IARC (the International Agency for Research on Cancer). Harmful health effects Acetaldehyde is a very reactive compound, which is known to react with many compounds in the body. In addition to ethanol, other xenobiotic precursors of AcH include phenacetin (Brittebo and Åhlman 1984), diethyl ether (Stowell et al. R. Rajendram, ... V. Preedy, in Encyclopedia of Human Nutrition (Third Edition), 2013. The taste of acetaldehyde is described as fresh with a fruity but sometimes musty odour. It is also the reason that alcohol has an effect on peoples behaviors while drinking alcohol and also the physiological effects that coincide with those. Elizabeth M. Brunt, ... Alastair D. Burt, in MacSween's Pathology of the Liver (Sixth Edition), 2012. It is used as a solvent in the rubber, tanning and paper industries, and as a preservative for fruit and fish. Mechanisms and Management, pp. 53 0 obj <>stream Acetaldehyde has been demonstrated to play important roles in the pathogenesis of AD.33 Acetaldehyde possesses reinforcing properties, a fact that suggests that some of the behavioral pharmacological effects induced by ethanol may be results of the formation of acetaldehyde, and supports the involvement of acetaldehyde in AD.34,35 Ethanol can be metabolized to acetaldehyde through three pathways, that is, the alcohol dehydrogenase (ADH), catalase, and MEOS (mainly CYP2E1). The sheer number of enzymes involved in the metabolism and detoxication of acetaldehyde and other aldehyde species is a testament to the impact of its reactivity. Philip, in Encyclopedia of Toxicology (Third Edition), 2014. 1981), and vinyl acetate (Fedtke and Wiegand 1990; Simon et al. Acetaldehyde also binds to DNA, generating stable adducts with mutagenic properties. 1978). Sometimes it is also used as a flavouring agent. The inactive form of ALDH2 is present in about 50% of Orientals.

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