Sulforaphane inhibits histone deacetylase causing cell cycle arrest and apoptosis in oral squamous carcinoma cells.
Level 5 - mechanism / opinion, no new human data
In vitro laboratory study on a cancer cell line
PubMed 39071758 · doi:10.1016/j.mjafi.2022.03.005
What was done
UPCI-SCC-172 oral squamous cell carcinoma cells were treated with sulforaphane (SFN) at three concentrations (10 µM, 20 µM, and 30 µM) for 24 and 48 hours. Proliferation was evaluated via MTT assay, and histone deacetylase (HDAC) activity was measured colorimetrically in nuclear extracts. Flow cytometry was used to analyze cell cycle distribution, reactive oxygen species (ROS) generation, and mitochondrial membrane potential (MMP). Extrinsic and intrinsic apoptotic pathway activation was measured via caspase enzyme assays.
What was found
SFN significantly inhibited cell proliferation and reduced HDAC activity by 44% at 24 h and 40% at 48 h (p < 0.01). Treatment with 10 µM SFN induced G2/M cell cycle arrest with a concomitant reduction in the G1 phase population at 24 and 48 h. Concentrations of 20 µM and 30 µM increased the sub-G1 apoptotic population at 48 h. SFN at 10 µM and 20 µM caused a 1.3- to 2.8-fold increase in ROS generation at 24 and 48 h, whereas 30 µM led to a drop in ROS. SFN induced a dose- and time-dependent drop in MMP and significantly activated both extrinsic and intrinsic caspase pathways (p < 0.001).
Why it matters
The study outlines the molecular and epigenetic pathways (HDAC inhibition, oxidative stress, and caspase activation) through which sulforaphane induces apoptosis in oral carcinoma cells in vitro.
Limits
This was an exclusively in vitro experiment restricted to a single cell line (UPCI-SCC-172), lacking in vivo pharmacokinetic validation or non-cancerous control cell comparisons. Exact proliferation inhibition percentages and replicate sample sizes were not reported in the abstract.
Cited by
- supports Pure sulforaphane induces cell death and apoptosis in cell cultures at concentrations of approximately 10 micromolar.