Intestinal Permeability: Alcohol and non-steroidal anti-inflammatory drugs, or NSAIDs, are harmful agents which can disrupt the balance of the digestive system, ultimately affecting the gastroduodenal mucosal and damaging the epithelial barrier along the gastrointestinal tract, or GI tract, increasing intestinal permeability. Moreover, it’s not uncommon for patients to have been exposed to the two substances at the same time. It is therefore important to know how simultaneous use can affect intestinal barrier function and acquiring that knowledge was the goal of several research studies.
Changes in intestinal permeability became more evident after Meddings et al. introduced the sucrose permeability test in 1993 as a non-invasive measure for evaluating the extent of gastrointestinal tract damage induced by non-steroidal anti-inflammatory agents, or NSAIDs. Subsequently, several studies demonstrated that intestinal barrier dysfunction to sucrose is a reasonable marker for the presence of GI tract damage in NSAID users. Other researchers used sucrose permeability tests to assess damage to the gastroduodenal mucosa induced by oral corticosteroids, intense exercise, infection, atrophic gastritis, Crohn’s disease, celiac disease, coffee, smoking, or a combination of these damaging factors. Alcohol is another agent that affects intestinal barrier function. A few studies have also demonstrated that acute alcohol consumption increases intestinal permeability. The effects of chronic exposure to alcohol on intestinal permeability, however, are less well established than that of NSAID use on intestinal permeability.
The pathogenesis of NSAIDs is well investigated, but still not fully understood. The use of NSAIDs, or non-steroidal anti-inflammatory drugs, has been associated with the increased risk of developing gastrointestinal disease, or GI disease, as well as other digestive health side effects and issues. Considerable amounts of evidence have also demonstrated that, much like chronic alcohol consumption, constant use of NSAIDs can affect intestinal barrier function, which may cause significant GI tract, or gastrointestinal tract, damage, such as ulcers, perforation, hemorrhage and an exacerbation of inflammatory bowel disease, or IBD. It has been suggested that the effect of NSAIDs has separate phases.
First, NSAIDs are included into biological membranes because of their lipophilic properties. They interact with brush border phospholipids, causing direct damage to intestinal epithelium. NSAIDs also detach oxidative phosphorylation, which leads to mitochondrial dysfunction and, consequently, to a reduction in intracellular ATP. The decrease in ATP results in reduced intestinal epithelial barrier function, as the regulation of the intracellular actin-myosin complex is an ATP-dependent process. The regulation of membrane phospholipids and intracellular ATP levels are followed by leakage of intracellular calcium and increased production of free oxygen radicals. These processes will directly change intestinal permeability by affecting the contraction of the intracellular cytoskeleton and the integrity of the tight junction, or TJ, complex. This increased permeability then triggers the last phase of NSAID-induced enteropathy, which is the transportation of luminal compounds, such as bile acids, bacterial breakdown products, acid and pepsin, into the intestinal mucosa, triggering an immune response as well as inflammation. In addition to the phases mentioned above, NSAIDs can also induce mucosal damage by its prostaglandin-inhibiting properties. After absorption, NSAIDs inhibit cyclooxygenase-1 and -2, or COX-1 and -2. COX-1 inhibition leads to a decrease in mucosal blood flow, whereas inhibition of COX-2 has an effect on immune regulation.
Both acute and chronic use of non-steroidal anti-inflammatory drugs by healthy volunteers and patients demonstrated changes in intestinal barrier dysfunction and hypermotility, abnormal or excessive movement, specifically of the gastrointestinal tract. In vitro research studies utilizing MKN28, a gastric epithelial cell line has also demonstrated that aspirin-induced increase in permeability was characterized by a considerable decrease in the expression of claudin-7, but not claudins-3, -4, ZO-1 or occludin.
NSAID-induced gastrointestinal tract damage was initially found to be a consequence of cyclooxygenase inhibition and decreased prostaglandin synthesis; however, it is now evident that intestinal barrier dysfunction is a multi-stage process. Experimental and clinical research studies have demonstrated a contribution from neutrophils, microcirculatory disturbances, oxygen free radicals and bile acids in NSAID-induced GI tract damage. NSAIDs increase intestinal nitric oxide synthase expression, resulting in increased levels of NO, boosting intestinal permeability. NSAIDs may also detach mitochondrial oxidative phosphorylation, which impairs the mitochondrial energy generation required for TJ complex integrity, resulting in increased intestinal inflammation and permeability. Finally, a recent study demonstrated that aspirin induced an increase in gastric epithelial cell permeability which was mediated by activation of p38 MAPK and a decrease in claudin-7, and treatment where a p38 MAPK inhibitor attenuated this response.
Clinical and experimental research studies have revealed that constant alcohol consumption may often lead to increased intestinal permeability, inhibition of nutrient transportation, such as vitamins and minerals, and a decreased absorption of sodium and water. Research study evaluation results demonstrated the involvement of the byproduct of ethanol metabolism, acetaldehyde and nitric oxide, or NO, in alcohol-mediated intestinal barrier dysfunction. High levels of acetaldehyde were detected along the gastrointestinal tract, or GI tract, of rats following the administration of ethanol. Increased levels of acetaldehyde has also been closely associated with increased intestinal permeability and endotoxin translocation, according to the research studies. In addition, the incubation of Caco2 cells with acetaldehyde demonstrated increased monolayer permeability. The growth was associated with increased tyrosine phosphorylation of both ZO-1, E-cadherin and ?-catenin. Exposing Caco2 monolayers to ethanol also boosts inducible nitric oxide synthase expression, stimulating increased NO, or nitric oxide, production as well as increased monolayer permeability. NO-induced changes were associated with an increase in unstable, non-polymerized tubulin and extensive damage to the microtubule cytoskeleton.
Experimental and clinical research studies in rodents have also demonstrated that acute administration of alcohol can cause mucosal damage in the upper small intestine, such as villus ulceration, submucosal blebbing and hemorrhagic erosions as well as intestinal barrier dysfunction. It has been acknowledged that alcohol-induced intestinal permeability helps enhance translocation of endotoxins across various organs, resulting in tissue damage and inflammation. Intragastric application of endotoxins from alcohol administration in rodents provided considerably higher plasma endotoxin levels than animals fed endotoxin alone. Similar lesions have also been found in healthy volunteers and active alcoholics following acute alcohol consumption while plasma endotoxin levels in alcoholics were found to be 5 times greater than in healthy controls. While not entirely understood, evidence suggests that the mechanism inherent alcohol-induced intestinal barrier dysfunction is connected to the introduction of inflammatory cells and to the release of various mediators, including cytokines, reactive oxygen species, leukotrienes and histamine.
Maintenance of the intestinal barrier function is important for our health, and dysfunction may be a risk factor for a variety of disorders and diseases. Information referenced from the National Center for Biotechnology Information (NCBI) and the National University of Health Sciences. The scope of our information is limited to chiropractic and spinal injuries and conditions. To discuss the subject matter, please feel free to ask Dr. Jimenez or contact us at 915-850-0900 .
By Dr. Alex Jimenez
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