Unlocking Leukaemia: How Garlic's Active Compound Could Revolutionize Treatment
"New Research Reveals Diallyl Disulfide's Promising Role in Differentiating Human Leukaemia Cells Through Calreticulin Regulation"
Acute myeloid leukaemia (AML) stands as a formidable and genetically diverse adversary, arising from the accumulation of somatic mutations within haematopoietic progenitor cells. Current strategies, encompassing surgery, radiation, and chemotherapy, offer relief but often fall short of eradicating the disease due to remaining tumour cells.
In light of these challenges, the induction of differentiation, a process that guides pre-malignant or malignant cells towards a more mature, benign state, has emerged as a promising therapeutic avenue. By selectively encouraging tumour cells to differentiate, scientists aim to eliminate these cells or reduce their malignant potential, paving the way for new treatments.
Amidst this pursuit, Diallyl disulfide (DADS), an active compound abundant in garlic, has garnered attention for its potential in combating cancer. Prior studies have illuminated DADS's ability to reduce the initiation of carcinogen-induced cancers and hinder the proliferation of various cancer cell types. Now, new research is diving deeper into how DADS interacts with human leukaemia cells, specifically exploring its influence on calreticulin (CRT), a protein involved in numerous cellular functions, and CCAAT enhancer binding protein-α (C/EBPα), crucial for normal neutrophil differentiation.
DADS and Its Potential Impact
Garlic is described as the most widely used plant medicinal product and exhibits antibacterial, hypo-lipidemic, antithrombotic, and anticancer effects. Diallyl disulfide (DADS) is a major oil-soluble organosulfur compound in garlic that has drawn attention for anticancer activity in leukemia and several other cancer types. However, a toxigenomic evaluation reported cytotoxic effects at high concentrations in Caco-2, HT-29, and HUVEC cells, as well as DNA damage in colorectal cancer cell lines.
From Garlic Chemistry to Cell Death
A 2012 chapter states that most effects of garlic are attributed to organosulfur compounds, particularly diallyl sulfides. Later mechanistic work identified a significant increase in intracellular reactive oxygen species as a primary and early event following DADS treatment in cancer cells. The same technical guide reports that excessive ROS induced by DADS can become toxic and trigger cell-death pathways.
How DADS Impacts CRT and C/EBPα in Leukaemia Cells
Researchers analysed clinical samples from healthy individuals and AML patients, they observed an inverse relationship between CRT and C/EBPα expression. High CRT levels were associated with low C/EBPα levels, and vice versa.
- Reactive Oxidative Species (ROS): DADS boosted ROS levels in leukaemia cells.
- RNA Immunoprecipitation: CRT binds to C/EBPα mRNA, affecting its degradation and regulation in the 3' untranslated region of C/EBPα.
Current Research Directions
A 2025 review reports that DADS has been examined for pharmacokinetics, molecular mechanisms of anticancer effects, and some clinical trials, but says its specific mechanisms and clinical-translational therapeutic potential remain insufficiently elucidated. Research in human leukemia HL-60 cells found that DADS downregulated RhoGDI2 and inhibited malignant biological behavior through the Rac1/Pak1/LIMK1 pathway. A separate review frames DADS research as a basis for further mechanistic inquiry and translational projects in preventive and curative cancer interventions.
Unresolved Mechanisms
The listed International Journal of Oncology source states that the mechanisms underlying differentiation induced by DADS have not been thoroughly elucidated. Another study investigated DADS-induced differentiation and its effects on proliferation, migration, and invasion in human leukemia HL-60 cells through the cofilin 1 signaling pathway. The available source material therefore supports active investigation, but not a complete mechanistic explanation or established clinical success.
Calreticulin and C/EBPα
The featured article presents DADS as a garlic-derived compound being explored for leukemia treatment. Its proposed mechanism involves downregulating calreticulin and promoting C/EBPα expression. The source describes this possibility as a potential way DADS could contribute to future leukemia treatment, rather than as an established therapy.
The Future of Leukaemia Treatment with DADS
The findings may help to provide new solutions to leukaemia treatment by providing critical evidence of the molecular mechanisms of DADS-induced leukaemic cell differentiation, in which DADS induces CRT down-regulation and translocation through the ROS pathway, releasing the interaction between CRT and C/EBPα mRNA, promoting C/EBPα expression and inducing leukaemia cell differentiation.
Evidence from HL-60 Studies
A 2018 study examined how DADS affected invasion and migration in HL-60 cells with high nuclear expression of parkinsonism-associated deglycase, also called DJ-1. Another study investigated DADS-induced differentiation and inhibitory effects on proliferation, migration, and invasion in human leukemia HL-60 cells through the cofilin 1 signaling pathway. Together, these sources describe laboratory findings involving leukemia-cell behavior, not confirmed outcomes in human patients.
A Hypothesized Differentiation Pathway
A study published on November 5, 2018, hypothesized that DADS downregulates calreticulin and promotes C/EBPα expression in the differentiation of human leukemia cells. This hypothesis places the human leukemia-cell response at the center of the proposed mechanism. The source material does not establish that this laboratory finding translates into a proven treatment for people.