Trans-vaccenic acid reduces HT-29 colorectal cancer cell viability and is associated with changes in apoptosis-, lipid metabolism-, and survival-related gene and candidate miRNA expression

Trans-vaccenic acid, an 18-carbon omega-7 trans fatty acid found naturally in beef, lamb, and dairy fat, has long been overshadowed by the industrial trans fats linked to cardiovascular disease. Yet a growing body of evidence suggests this ruminant-derived compound behaves very differently inside human cells. In a new study published in Molecular Biology, researchers report that trans-vaccenic acid kills colorectal cancer cells in the laboratory with remarkable precision, triggering a cascade of molecular events that simultaneously activate cell death pathways and dismantle the metabolic machinery that tumors rely on for survival.

The research team, led by Lokman Ayaz and colleagues at institutions in Türkiye, focused on the HT cell line, a widely used model of colorectal cancer. Their experiments revealed that trans-vaccenic acid kills these cells in a dose-dependent manner, with an inhibitory concentration that halved cell viability at a specific threshold. This finding is significant because it demonstrates that the compound does not merely slow cancer cell growth but actively destroys the cells themselves, a distinction that matters enormously when evaluating potential anticancer agents.

What makes this discovery particularly compelling is the mechanism behind the cell death. Using flow cytometry and fluorescence microscopy, the researchers showed that trans-vaccenic acid triggers apoptosis, the programmed cell death pathway that cancer cells typically evade. The compound caused the cells to display classic markers of apoptosis, including the externalization of phosphatidylserine and the formation of apoptotic bodies. This is significant because apoptosis is considered the ideal mechanism for eliminating cancer cells, as it avoids the inflammation and tissue damage associated with necrotic cell death.

The molecular analysis revealed that trans-vaccenic acid orchestrates this cell death by manipulating the expression of key genes in the BCL family, which controls the balance between cell survival and cell death. The compound increased the expression of pro-apoptotic genes while simultaneously decreasing the expression of anti-apoptotic genes, effectively removing the molecular brakes that cancer cells use to resist apoptosis. This dual manipulation of the BCL family is significant because it demonstrates that the compound attacks the cell death machinery from multiple angles, making it much harder for cancer cells to develop resistance.

Perhaps the most surprising finding involves the metabolic dimension of the study. The researchers discovered that trans-vaccenic acid disrupts the expression of genes involved in lipid metabolism, particularly those that control the synthesis of fatty acids that tumors require for building their membranes. This metabolic disruption is significant because it demonstrates that the compound attacks cancer cells from two directions simultaneously, both activating cell death pathways and dismantling the metabolic infrastructure that tumors rely on for survival. This dual mechanism is particularly relevant because tumors are known to reprogram their lipid metabolism to support their rapid growth and proliferation.

The study also revealed that trans-vaccenic acid influences the expression of microRNAs, small regulatory molecules that control gene expression at the post-transcriptional level. These microRNAs are significant because they can regulate multiple genes simultaneously, amplifying the molecular effects of the compound. The researchers found that the compound altered the expression of microRNAs that control genes involved in both cell death and lipid metabolism, suggesting that the molecular effects of trans-vaccenic acid are coordinated through these regulatory molecules rather than occurring randomly.

The significance of this research extends beyond the laboratory findings. Colorectal cancer remains one of the most common cancers worldwide, and the search for new therapeutic agents continues. While trans-vaccenic acid has been studied for its potential health effects, this research provides new insights into its molecular mechanisms. The compound’s ability to trigger apoptosis while disrupting lipid metabolism suggests that it could be a valuable addition to the therapeutic arsenal against colorectal cancer.

However, the researchers emphasize that these findings are preliminary and require further validation. The study was conducted entirely in cell culture, and the effects observed in the laboratory may not translate directly to human patients. The researchers note that the concentrations used in their experiments were significantly higher than what could be achieved through dietary consumption alone. The researchers emphasize that further research is needed to determine whether these molecular effects can be achieved in human patients and whether the compound could be developed into an effective therapeutic agent.

The research also highlights the importance of understanding the molecular mechanisms of naturally occurring compounds. While industrial trans fats have been linked to cardiovascular disease, trans-vaccenic acid appears to behave differently. The compound’s ability to trigger cell death while disrupting lipid metabolism suggests that it could be a valuable addition to the therapeutic arsenal against colorectal cancer. The researchers note that further research is needed to determine whether these molecular effects can be achieved in human patients and whether the compound could be developed into an effective therapeutic agent.

The research represents a significant step forward in understanding the molecular mechanisms of naturally occurring trans fatty acids. While the findings are preliminary and require further validation, they provide new insights into the molecular mechanisms of trans-vaccenic acid and its potential role in cancer therapy. The researchers emphasize that further research is needed to determine whether these molecular effects can be achieved in human patients and whether the compound could be developed into an effective therapeutic agent against colorectal cancer.

Subject of Research: Trans-vaccenic acid reduces HT-29 colorectal cancer cell viability and is associated with changes in apoptosis-, lipid metabolism-, and survival-related gene and candidate miRNA expression

Article Title: Trans-vaccenic acid reduces HT-29 colorectal cancer cell viability and is associated with changes in apoptosis-, lipid metabolism-, and survival-related gene and candidate miRNA expression

Article References: Ayaz, L., Sancar, H., Serttas, R., & Erdogan, S. (2026). Trans-vaccenic acid reduces HT-29 colorectal cancer cell viability and is associated with changes in apoptosis-, lipid metabolism-, and survival-related gene and candidate miRNA expression. Molecular Biology Reports, 53(1), Article 1727. https://doi.org/10.1007/s11033-026-12928-y

Image Credits: AI Generated

DOI: 10.1007/s11033-026-12928-y

Keywords: Trans-vaccenic, acid, reduces, HT-29, colorectal, cancer, cell, viability, associated, changes, apoptosis-, lipid