In summary, these studies demonstrate that alcohol exposure compromises Alcohol and Lung Disease innate defenses against viral pathogens such as RSV in part by disrupting airway ciliary function. As is the case with other organs, alcohol’s specific effects on the conducting airways depend on the route, dose, and length of the exposure (Sisson 2007). More recent studies have established that biologically relevant alcohol concentrations have very focused and specific effects on the lung airways.
Mechanisms of Alcohol-Induced Lung Injury
Alcohol dehydrates the body, which can thicken mucus in the airways and make it more difficult to clear out harmful particles. For people with conditions like asthma or bronchitis, this can worsen symptoms and increase the likelihood of flare-ups. Acute respiratory distress syndrome (ARDS) is a life-threatening condition characterized by severe inflammation and fluid buildup in the lungs. Research has shown that individuals with a history of heavy alcohol use are at a significantly higher risk of developing ARDS.
“A lot of people with this genetic variant are aware of some of the visible symptoms, but they don’t know that it means alcohol really puts them at more risk than other people,” Chen said. Chen’s research has shown how alcohol affects people of East Asian descent who have a genetic variation, ALDH2, which interferes with their ability to metabolize acetaldehyde. These people — about 8% of the world’s population — often experience facial flushing and a rapid heartbeat after just one drink. The studies, however, had some major flaws, including that people’s drinking was generally categorized only by their current behavior. Reducing or eliminating alcohol consumption can help restore some of their natural defenses.
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Alcohol use disorder can cause a susceptibility to infection after major trauma to the lungs / respiratory system. It creates an increased risk of aspiration of gastric acid, microbes from the upper part of the throat, decreased mucus-facilitated clearance of bacterial pathogens from the upper airway and impaired pulmonary host defenses. This increased colonization by pathogenic organisms, combined with the acute intoxicating effects of alcohol and the subsequent depression of the normally protective gag and cough reflexes, leads to more frequent and severe pneumonia from gram-negative organisms. Defects in the function of the upper airway’s clearance mechanisms in alcoholic patients have been detected.
Effects of Alcohol on Lung Health and the Immune System
In addition, the incidence of infections with Klebsiella pneumoniae also is increased in people with AUD and seems to cause disproportionate rates of lung infection and high mortality in this population (Feldman et al. 1990; Limson et al. 1956). The alveolar macrophages eliminate pathogens by ingesting them—a process known as phagocytosis—whereas neutrophils are involved in inflammatory responses. As discussed previously, alcohol not only alters the environment of the alveolar space but also directly affects GM-CSF signaling, which regulates the maturation, terminal differentiation, and function of alveolar macrophages.
In addition to neutrophil recruitment to infected areas and reduced neutrophil-killing potential, production of these cells also is affected. In healthy individuals, the bone marrow produces approximately 120 billion neutrophils per day (Cartwright et al. 1964; von Vietinghoff and Ley 2008). Moreover, bone-marrow neutrophil production is significantly increased 24 to 48 hours after a systemic bacterial infection (Melvan et al. 2011). Alcohol exposure suppresses neutrophil production by the bone marrow and other blood cell–producing (i.e., hematopoietic) tissues (Melvan et al. 2011; Raasch et al. 2010; Siggins et al. 2011). This decreased neutrophil proliferation may account for the decreased number of neutrophils found in the lungs during the host response to pneumonia following alcohol consumption.
Reduced Lung Function
While smoking is the primary cause of lung cancer, studies have found that alcohol can act as a co-carcinogen, meaning it enhances the carcinogenic effects of tobacco. When alcohol and tobacco are combined, the risk of developing lung cancer is significantly higher than when either substance is used alone. Understanding the association between alcohol consumption and lung diseases highlights the importance of moderation and responsible drinking. By adopting healthier habits, seeking professional help if needed, and making informed choices, individuals can reduce the risk of developing these alcohol-related lung diseases.
- Delayed-type hypersensitivity responses are excessive immune reactions that occur only a few days after the body has been exposed to the pathogen.
- While control mice maintain alveolar integrity to both intraperitoneal and intratracheal LPS delivery, alcohol significantly enhances both alveolar and endothelial leak, thus establishing the importance of the approach to modeling complex lung barrier function in alcohol research.
- Stafford and his colleagues said the choice to tip back a beer or forgo alcohol — like many lifestyle decisions — should involve weighing the risks and benefits of your behaviors.
- Research has shown a clear association between alcohol consumption and negative effects on lung health.
- In addition to moderate alcohol consumption, adopting a healthy lifestyle can contribute to better lung health.
- B cells are responsible for the second arm of the immune response (i.e., the humoral immunity) that is mediated not by specific cells but by immune molecules (i.e., antibodies) produced and secreted by B cells in response to exposure to a pathogen.
Activation of this dual kinase signaling pathway results in faster cilia beat frequency (CBF) in cilia briefly exposed to a moderate alcohol dose compared with controls (Sisson 1995; Sisson et al. 2009; Stout et al. 2007; Wyatt et al. 2003). More recent studies demonstrated that this rapid and transient alcohol-induced increase in NO levels was triggered by the alcohol-induced phosphorylation of heat shock protein 90 (HSP90) (Simet et al. 2013b). Upon phosphorylation, HSP90 increases its association with endothelial nitric oxide synthase (eNOS) in cilia, which then activates the cyclase–kinase cascade, resulting in increased CBF (Simet et al. 2013b). These findings are counterintuitive to the conventional wisdom that alcohol interferes with lung host defenses because stimulation of CBF should protect the lung; however, the clinical observation is that heavy alcohol exposure impairs lung host defenses.
Studies in rats that had been fed alcohol for a prolonged period of time found that expression of inactive TGF-β1 protein doubled in lung tissue compared with nondrinking animals; however, there was no evidence of TGF-β1 release or activation in the absence of an infection (Bechara et al. 2004). Nevertheless, alcohol-fed rats released five times more activated TGF-β1 into the alveolar airspaces than did nondrinking rats in the presence of bacterial toxins in their blood (i.e., during endotoxemia). Additional studies using alveolar epithelial cell layers derived from these alcohol-fed rats found that this permeability defect was inhibited by neutralizing antibodies to TGF-β1 (Bechara et al. 2004). Together, these data suggest that prolonged alcohol intake increases TGF-β1 levels, which during inflammatory responses can be released and activated in the alveolar space, where it can directly impair epithelial barrier properties (Guidot and Hart 2005). Another key function of the alveolar epithelium, namely the synthesis and secretion of surfactant—which is required to maintain alveolar integrity and gas exchange—also is impaired by chronic alcohol ingestion (Holguin et al. 1998). This impairment also is mediated by glutathione deficiency in the cells, and particularly in the mitochondria, and is reversible with dietary procysteine supplementation (Guidot and Brown 2000).
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- When we think about the effects of alcohol on the body, the liver, brain, and heart often come to mind.
- From there, it circulates throughout the body, reaching every organ, including the lungs.
- Understanding the chronic effects of alcohol on the lungs highlights the importance of moderation when it comes to alcohol consumption.
- There also may be some concerns about alcoholic patients’ compliance with chronic oral treatments, such as zinc and SAMe supplements.
- The studies, however, had some major flaws, including that people’s drinking was generally categorized only by their current behavior.
Alcohol-induced suppression of G-CSF–driven neutrophil production combined with impaired bacterial clearance likely account for the high severity and mortality of bacterial infections among the alcohol-fed mice observed in these studies. The depletion of glutathione within the alveolar space of people with AUD explains many of the alcohol-related defects in the function of the alveolar epithelium as well as in the function of immune cells called macrophages (which will be discussed in the next section). Glutathione levels are affected by oxidative stress and inflammation; however, lungs of alcohol-exposed animals show no gross evidence of inflammation or injury at baseline, and otherwise healthy alcoholics likewise have no indication of lung inflammation or oxidative stress. Without evidence of an oxidant assault on the otherwise healthy alcoholic lung, the question remains why there is such overwhelming glutathione depletion. An intriguing answer comes from recent studies showing that, at least in experimental models, chronic alcohol ingestion inhibits the expression and function of a protein called Nrf2.
From increasing susceptibility to infections to contributing to life-threatening conditions, alcohol’s effects on the lungs are profound and often underestimated. Those who have concerns about their lung health or alcohol consumption can consult their doctor for further advice and guidance. These chemical changes compound the negative mechanical and microbiological effects of alcoholism on the respiratory system. These include impaired gag reflex and cilia function and greater likelihood of colonies of pneumococcal bacteria in the upper respiratory system. Even in people who are not struggling with alcohol use disorder, drinking alcohol can affect other psychiatric conditions. The health risks of alcohol develop because ethanol, the type of alcohol found in beverages, metabolizes into a compound called acetaldehyde, which damages DNA and other cellular components.
Role of Alcohol in the Development of Lung Cancer
Over the past two decades, studies demonstrated that brief exposure to modest alcohol concentrations triggers generation of nitric oxide (NO) in the airway epithelial cells. This NO production stimulates a signaling pathway that involves the enzyme guanylyl cyclase, which produces a compound called cyclic guanosine monophosphate (cGMP). CGMP, in turn, activates cGMP-dependent protein kinase (PKG), followed by activation of the cyclic adenosine monophosphate (cAMP)-dependent protein kinase A (PKA).