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Zhai, Z.; Yamauchi, T.; Shangraw, S.; Hou, V.; Matsumoto, A.; Fujita, M. Exposure to Ethanol and Acetaldehyde Cause Skin Cancer. Encyclopedia. Available online: https://encyclopedia.pub/entry/41945 (accessed on 19 November 2024).
Zhai Z, Yamauchi T, Shangraw S, Hou V, Matsumoto A, Fujita M. Exposure to Ethanol and Acetaldehyde Cause Skin Cancer. Encyclopedia. Available at: https://encyclopedia.pub/entry/41945. Accessed November 19, 2024.
Zhai, Zili, Takeshi Yamauchi, Sarah Shangraw, Vincent Hou, Akiko Matsumoto, Mayumi Fujita. "Exposure to Ethanol and Acetaldehyde Cause Skin Cancer" Encyclopedia, https://encyclopedia.pub/entry/41945 (accessed November 19, 2024).
Zhai, Z., Yamauchi, T., Shangraw, S., Hou, V., Matsumoto, A., & Fujita, M. (2023, March 07). Exposure to Ethanol and Acetaldehyde Cause Skin Cancer. In Encyclopedia. https://encyclopedia.pub/entry/41945
Zhai, Zili, et al. "Exposure to Ethanol and Acetaldehyde Cause Skin Cancer." Encyclopedia. Web. 07 March, 2023.
Exposure to Ethanol and Acetaldehyde Cause Skin Cancer
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This entry is adapted from the peer-reviewed paper 10.3390/cancers15041258

Acetaldehyde (AcAH) is a carcinogenic byproduct of ethanol metabolism. Ethanol-associated malignancies commonly occur in the upper gastrointestinal tract exposed to AcAH after ethanol ingestion. Unexpectedly but true, emerging epidemiological evidence supports a link between alcohol consumption and cutaneous melanoma, suggesting skin exposure to ethanol and AcAH as potential causes of skin cancer. 

melanoma ethanol acetaldehyde

1. Introduction

Melanoma is the most serious type of skin cancer, with an increasing incidence worldwide [1][2]. Cumulative evidence indicates that the risk of melanoma correlates with genetic factors [3][4], personal lifestyles [5][6], and phenotypic risk factors that reflect gene/personal lifestyle interactions [7][8]. Individual lifestyle factors associated with melanoma risk include UV exposure, cigarette smoking, alcohol use, overweight and obesity, poor diet, environmental pollution, and stress [5][6]. Nearly half (14 out of 29) of the studies on the relationship between alcohol consumption and melanoma, including 10 cohort and 19 case-control studies, have shown a positive correlation, while only 2 showed a negative correlation. Further, of 20 studies assessing alcohol dose effects, 13 (65%) demonstrated an association between alcohol dose and melanoma risk [9]. These associations became stronger in multiple meta-analyses with larger sample sizes [10][11][12][13]. A systematic meta-analysis by Gandini et al. found that individuals in the highest category of recent alcohol intake had a 30% increased risk of melanoma compared to those in the lowest category, and a nearly two-fold increased risk of melanoma was found with cumulative alcohol consumption [14].
Approximately 4% of cancer cases worldwide are caused by alcohol consumption [15]. The main culprit for this is acetaldehyde (AcAH), an immediate metabolite of ethanol. AcAH is a mutagen and carcinogen implicated in a wide range of cancers by forming adducts with proteins and DNA and disrupting cellular functions [16][17]. However, ethanol and AcAh are derived not just from alcohol drinking but from various sources, some of which exist naturally [18][19]. In fact, our skin is exposed to ethanol and AcAH every day, regularly at extremely low and safe levels [18][19][20]. While our skin, like the liver, is equipped with ethanol metabolism mechanisms to reduce the concentration of ethanol and AcAH [18][20], dysfunction of these ethanol and AcAH metabolizing enzymes in the skin may greatly influence the skin biology and increase the risk of ethanol/AcAH-associated skin diseases.

2. Exposure to Ethanol and AcAH

Humans are in a chemical and toxicological environment [21] and are exposed to ethanol and AcAH in many ways. Once in the bloodstream, ethanol and AcAH can reach many organs and tissues, including the skin [22]. The skin is also directly exposed to alcohols and aldehydes from natural chemicals or industrialized products [19][20].

2.1. Sources of Ethanol

Ethanol is not only the active ingredient of alcoholic beverages (beers, wines, and spirits) but also is a ubiquitous substance from various sources (Figure 1). It is one of the main indoor and outdoor pollutants [19]. In addition to alcoholic beverages and air pollutants, non-alcoholic beverages on the market can contain as much as 0.5% ethanol [23]. Certain herbal medicines, including those used to treat coughs, colds, and gastrointestinal (GI) diseases, are also sources of ethanol [24]. Furthermore, many foods contain ethanol, which is produced from sugar through fermentation. Examples include fermented foods (i.e., bread, yogurt, vinegar, and kimchi), preservatives, bakery products, fruit, and fruit juices [25]. Brewers and bakers use yeast to make a variety of alcoholic beverages and expand the dough.
Cancers 15 01258 g001
Figure 1. Schematic overview of the major factors leading to human skin exposure to ethanol and/or acetaldehyde. ACR, acetyl-CoA reductase; PDC, pyruvate decarboxylase; PFL, pyruvate formate-lyase; POR, pyruvate ferredoxin oxidoreductase.
Even without the exogenous ethanol intake mentioned above, our bodies contain low levels of ethanol. Baseline ethanol levels in the blood and breath can reach 0.02–0.15 mg/dL and 0.07–0.39 mg/L, respectively, without consuming alcohol [26]. These low levels of ethanol are generated by microbial fermentation. Fermenting yeasts such as Saccharomyces and Candida (C.) and fermenting bacteria such as Zymomonas mobilis and Sarcina ventriculi are present in our oral cavity and digestive tract. These microbiotas use anaerobic respiration to convert non-ethanol, carbohydrate-rich foods such as glucose and lactose to ethanol by fermentation in the oral cavity, GI system, or urinary system [27]. This microbial ethanol production is particularly interesting in certain medical conditions.
In auto-brewery syndrome (ABS), also known as gut fermentation syndrome, microbiota-derived ethanol concentrations in the body are comparable to those produced by directly consuming alcoholic beverages [28][29]. In a study conducted by Malik et al., the blood alcohol concentration (BAC) in an ABS patient reached 400 mg/dL [30], which is comparable to a BAC that can cause respiratory depression, coma, and death [31]. The species causing the ABS include Klebsiella pneumoniae, C. albicans, C. glabrata, Saccharomyces cerevisiae, C. intermedia, C. parapsilosis, and C. kefyr [32]. ABS is a rare condition. This syndrome could be underdiagnosed, as the symptoms may be mood changes, delirium, and brain fog or mimic a food allergy [30][32][33]. Triggers of this ABS include meals high in carbohydrates, psychological stress, and reduced dietary intake. ABS may also be related to pre-existing conditions, including a history of antibiotic use and comorbidities, such as type 2 diabetes, obesity, liver cirrhosis, and Crohn’s disease [27].
Ethanol can also be produced from AcAH by microbial reduction [34].

2.2. Sources of AcAH

Similar to ethanol exposure, human exposure to AcAH is not only from alcohol consumption but also from other diverse sources (Figure 1). AcAH can be produced endogenously in any tissue with high ethanol metabolizing enzyme activity [35]. Bodily AcAH may come from oral and gut microbes that metabolize ethanol to AcAH. Salivary AcAH levels reached up to 140 µM after ingesting a moderate amount of ethanol (0.5 g/kg body weight) [35]. Long-term exposure to locally produced AcAH in saliva may explain the higher risk of upper GI cancers in heavy drinkers [35].
The atmospheric AcAH are from photochemical production, net ocean emissions, biogenic emissions, biomass burning emissions, and anthropogenic emissions, accounting for 60%, 27%, 11%, 1.6%, and < 1% of global AcAH production, respectively [36]. The largest source is the photo-oxidation of volatile organic compounds such as alkanes and alkenes [36]. The second-largest source is water bodies that degrade dissolved organic compounds through the photochemical mechanism and emit AcAH into the atmosphere [37]. Most plant cells and some microorganisms use anaerobic respiration to break down glucose to AcAH and release carbon dioxide (biogenic emissions). Biomass burning emissions are from wildfire smoke and biofuel burning. Another source of AcAH includes urban and industrial pollution, such as residential fireplaces, woodstoves, ethanol fuel, vehicle exhaust fumes, coal refining, and waste processing. Therefore, like ethanol, AcAH is a common noxious environmental pollutant [19]. Nevertheless, sinks of atmospheric AcAH include reaction with hydroxyl radical, photolysis, and wet and dry deposition, leading to an overall atmospheric lifetime for AcAH of approximately 20 h [36][38].
AcAH sources also include occupational exposure. Individuals may be at risk of higher AcAH exposure when working in gas stations [39], transportation vehicles [40], waterpipe café [41], bakeries [42], and beauty salons [43], as well as in industries using AcAH as a solvent for perfumes, polyester resins, acetic acid, mirror silvering, tanning leather, denaturing alcohol, fuel compositions, gelatin fiber hardeners, glue and casein products, paper, cosmetics, aniline dyes, plastics, and synthetic rubber [44].
AcAH is also contained in various foods (e.g., fermented food, roasted coffee, bread, and ripe fruit) and beverages and is used as a flavoring agent and a preservative for fruits and fish [45][46].
Furthermore, AcAH is a byproduct of tobacco smoking [47]. When coupled with nicotine, AcAH has been shown to increase the addictive potential of smoking [48][49]. Nieminen et al. reported that the concentration of AcAH in saliva remains as high as 261 μM with one cigarette, which is higher than the AcAH concentration after drinking high-concentration (40%) ethanol for a short period [47]. Smoking can increase AcAH production from ethanol in saliva by 60–75%; for heavy drinking, the increase in AcAH is up to 100% [47].
Another source of AcAH is pyruvate, an important energy source produced during glycolysis. In anaerobic conditions, yeast use pyruvate decarboxylase (PDC) to convert pyruvate to AcAH, and C. albicans, an opportunistic pathogenic yeast, has been shown to contribute to oral squamous cell carcinoma progression by producing high levels of AcAH from glucose under low oxygen conditions [50][51]. Some bacteria also use PDC to convert pyruvate to AcAH. However, as a common pathway in bacteria, pyruvate is first decarboxylated to acetyl-CoA by pyruvate ferredoxin oxidoreductase and/or pyruvate formate-lyase. Acetyl-CoA is then converted into AcAH by acetylating acetyl-CoA reductase in bacteria [52]. Since the enzymes to produce AcAH from pyruvate have not been reported in humans, pyruvate-derived AcAH is likely produced from bodily microbiota rather than human cells.
Collectively, ethanol and AcAH are part of our life. The skin is exposed to these toxic metabolites through the air, water, land, smoke, food, and bodily microbiota, among other means. Since ethanol and AcAH are readily degraded in the environment or metabolized in the body, the anticipated skin exposure levels are very low or safe. However, when the body’s metabolic process becomes dysfunctional, high levels of ethanol and AcAH can cause health consequences, including skin diseases.

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Zili Zhai
,
Takeshi Yamauchi
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Sarah Shangraw
,
Vincent Hou
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Akiko Matsumoto
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Mayumi Fujita
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