Alcohol Kills Esophageal Cells Mostly Through Ferroptosis, Lab Study Finds

A short brush with alcohol can push esophageal cells to grow, but a longer soak kills them off through several forms of programmed cell death at once, with ferroptosis emerging as the dominant killer, according to an in vitro study published in BMC Molecular and Cell Biology. Researchers exposed two human esophageal epithelial cell lines, Het1A and HEEC, to ethanol at concentrations and durations meant to mimic the contact between a drink and the lining of the esophagus, and then tracked the molecular fingerprints of survival and death over time.

The dose experiments drew on the ethanol strengths of common drinks: roughly 0.5 percent, 5 percent, 13 percent, and 40 percent. After two hours of exposure, cells cultured with 0.5 percent ethanol actually grew better than untreated controls, while viability fell at every higher concentration in a dose-dependent manner. At 40 percent ethanol, about 75 to 80 percent of the cells were dead after two hours. The authors caution that the in vitro setup cannot reproduce the mucus layer and other protections of the living esophagus, so the concentrations in the dish are not equivalent to drinking a beer.

Time proved just as important as dose. When cells were bathed in 5 percent ethanol, the number of viable cells rose during the first 30 minutes, ending about 25 percent higher than controls. Then the population collapsed: at the two-hour mark, only about 45 percent of the plated cells were still alive. After that low point, the survivors regained their proliferative capacity, and after an overnight exposure the cell population had nearly returned to control levels, with colonies gradually refilling the gaps left by dead neighbors.

The early growth spurt depended on autophagy, the cellular recycling program that consumes damaged components to keep a stressed cell alive. Within the first 30 minutes of alcohol contact, more and more cells developed puncta of LC3B, a marker of autophagosome formation. When the researchers blocked autophagy with chloroquine, viability at 30 minutes dropped by 36 percent relative to alcohol alone, and the fraction of cells staining positive for the proliferation marker PCNA fell from roughly 95 percent to 36 percent in HEEC cells and 14 percent in Het1A cells. Western blotting confirmed that 30 minutes of alcohol raised LC3B levels about threefold and PCNA about threefold, gains that were largely erased by chloroquine.

As exposure continued, the picture darkened. After two hours in 5 percent ethanol, caspase-9 and caspase-3 were cleaved into their active fragments, indicating intrinsic apoptosis triggered through the mitochondrial pathway, while caspase-8 remained in its inactive procaspase form. About 16 percent of cells showed nuclear translocation of endoG, an enzyme that fragments DNA during intrinsic apoptosis. Blocking the pathway with a caspase-9 inhibitor improved viability by 36 percent in HEEC and 24 percent in Het1A at two hours. Yet apoptosis faded with time: the endoG-positive fraction shrank as exposure continued, suggesting the surviving cells were repairing mitochondrial leakage.

Necroptosis moved in the opposite direction, strengthening as exposure lengthened. The executioner protein MLKL began appearing on cell membranes as early as 30 minutes, and by 12 hours about 15 percent of cells showed membrane localization. Immunoprecipitation showed that MLKL formed phosphorylated oligomers larger than 100 kilodaltons in response to alcohol, and the necroptosis inhibitor necrosulfonamide abolished both the phosphorylation and the oligomerization while improving viability by 18 percent at 12 hours. The authors attribute the shift to a simple biochemical logic: caspase activation that drives apoptosis suppresses necroptosis, so as caspase activity waned, necroptosis took over.

One form of cell death was conspicuously absent. Pyroptosis, an inflammatory lysis mediated by caspase-1 cleavage of gasdermin D, never appeared. Gasdermin D did not accumulate on membranes, western blots showed no cleavage of gasdermin D, caspase-1, or interleukin-1 beta, and a pyroptosis inhibitor failed to change the growth curve. The researchers note this may reflect their in vitro method, since the gut microbes and inflammatory signals that can activate pyroptosis in the body would not reach cells in a culture dish.

Ferroptosis, an iron-driven death involving lipid peroxidation, emerged as the main killer. GPX4, an enzyme that detoxifies lipid peroxides, began declining the moment cells met alcohol and fell by 70 percent in HEEC and 80 percent in Het1A after two hours, with its partner SLC7A11 downregulated as well. Prussian blue staining revealed iron inside cells almost immediately after alcohol contact, with iron-positive cells increasing fivefold in HEEC and tenfold in Het1A within five minutes. Cellular ROS rose dose-dependently across all ethanol concentrations, peaking in iron accumulation at 5 percent ethanol, which raised iron-containing cells sixfold in HEEC and eightfold in Het1A. Critically, ferrostatin-1, a ferroptosis inhibitor, restored SLC7A11 and GPX4 levels, normalized lipid peroxidation, and significantly improved viability, especially at the two-hour mark.

The final twist was recovery. After six hours of exposure, surviving cells began proliferating again and reformed monolayer patches by 12 hours. The pro-apoptotic protein BAX, which drives mitochondrial outer membrane permeabilization, spiked 4.3-fold in HEEC and 6.8-fold in Het1A at two hours but fell back by 30 percent and 70 percent respectively by 12 hours, a pattern consistent with anastasis, the poorly understood process by which cells retreat from the brink of apoptosis. The authors urge caution about these survivors: cells that have endured partial mitochondrial permeabilization and caspase activation may carry genomic changes, and the paper proposes, as a hypothesis for future work rather than a demonstrated outcome, that such revived cells could potentially seed esophageal malignancy.

The study’s scope is strictly cellular. Everything reported here happened in culture dishes with immortalized cell lines, and the authors explicitly warn that the results may not reflect the actual physiology of a person after drinking. Still, the work offers a detailed timeline of how esophageal epithelial cells respond to direct alcohol contact: autophagic rescue in the first half hour, apoptotic death peaking at two hours, necroptosis and iron-driven ferroptosis dominating thereafter, and finally a resilient minority rebuilding the sheet. Whether the same sequence unfolds in the lining of a living esophagus, and what the revived cells mean for cancer risk, remains to be tested.

Subject of Research: Programmed cell death responses of human esophageal epithelial cells to alcohol exposure in vitro

Article Title: Alcohol exposure induces ferroptosis-dominated programmed cell death in esophageal epithelial cells

Article References: Wang, D., Jiang, Z., Meng, Z., Hou, W., Dang, T., Meng, X., & Chai, J. (2026). Alcohol exposure induces ferroptosis-dominated programmed cell death in esophageal epithelial cells. BMC Molecular and Cell Biology, 27(1), Article 28. https://doi.org/10.1186/s12860-026-00589-5

Image Credits: AI Generated

DOI: 10.1186/s12860-026-00589-5

Keywords: ferroptosis, esophageal epithelial cells, alcohol, autophagy, apoptosis, necroptosis, anastasis, in vitro study, GPX4, ethanol exposure, programmed cell death, exposure