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Trichostatin A, almost always shortened to TSA, is the classic laboratory HDAC inhibitor; it is a natural product first pulled from a Streptomyces bacterium (originally as an antifungal) that turned out to be an extremely potent, reversible blocker of the histone deacetylase family. It is not a medicine and is not used in people; instead it is one of the most heavily used tools in epigenetics research, the reference compound scientists reach for whenever they want to crank up histone acetylation in a dish and watch what happens to gene expression, cell behavior, or cell identity.
- Reference-grade, extremely potent pan-HDAC inhibitor
- Reversible, works at nanomolar concentrations
- Invaluable tool for studying epigenetics and gene regulation
- Widely used in stem-cell and reprogramming research
- Broadly disrupts gene regulation and cell division
Mechanism
TSA is a hydroxamic-acid molecule, and that hydroxamate group is the business end; it slips into the narrow channel of the enzyme and grabs the catalytic zinc ion at the bottom, shutting the enzyme down at nanomolar concentrations across essentially the whole classical HDAC family (a true pan-inhibitor) [1]. With deacetylation blocked, acetyl marks pile up on histones, chromatin loosens, and transcription patterns shift, which is exactly why researchers use it as a blunt instrument to probe biology.
Its published uses read like a tour of what inhibition does. In cancer-cell models TSA re-tuned drug-resistance genes, lowering expression of the MDR1 (ABCB1) pump that spits chemotherapy back out of resistant cells [2]. In eye-tissue models it suppressed the epithelial-to-mesenchymal transition and the runaway proliferation behind scarring disorders of the retina and lens, by arresting the cell cycle and calming pro-fibrotic signaling [3][4]. And in stem-cell and cloning research it is a workhorse: applied to mesenchymal stem cells it broadly reshaped the transcriptome and nudged cells toward new differentiation paths, part of why TSA treatment is a standard trick for improving reprogramming in somatic-cell nuclear transfer [5]. The flip side of that power is toxicity; because inhibition disrupts development, TSA is a known teratogen (it causes birth defects in animal studies), which is one of several reasons it stayed a research reagent rather than a drug [6].
receptor fingerprint
family (pan, zinc-dependent)inhibits reversibly (nanomolar)
Histone acetylation stateincreases
Cell proliferation / EMT (in models)suppresses
Safetyrisks and cautions, not medical advice
Trichostatin A is a research-use-only chemical with no approved human use and no established safe dose in people; treat it as a hazardous laboratory reagent, not a supplement. It is a potent, broad HDAC inhibitor that disrupts gene regulation and cell division, and it is documented as teratogenic (harmful to embryonic development) in animal studies, so it is especially dangerous around pregnancy. Handle with gloves and proper lab precautions, avoid skin contact and inhalation, and do not ingest it. Anyone treating TSA as something to dose for cognitive or longevity purposes is misusing a toxic research chemical.
Subjective profileweighing the evidence above
A laboratory reagent, not a supplement, and treating it as a longevity compound is a straightforward misuse of a toxic chemical. It disrupts gene regulation and cell division broadly and is teratogenic in animal studies, which makes it especially dangerous around pregnancy.
Resources
This entry is here for reference.
Research
- 2005first citedAssociation of valproate-induced teratogenesis with histone deacetylase inhibition in vivo
- 2017most recentThe effect of histone deacetylase inhibitor trichostatin A on porcine mesenchymal stem cell tra…
- 1.Teratogenic activity of HDAC inhibitors
- 2.The histone deacetylase inhibitor trichostatin A downregulates human MDR1 (ABCB1) gene expression by a transcription-dependent mechanism in a drug-resistant small cell lung carcinoma cell line model
- 3.Trichostatin A, a histone deacetylase inhibitor, suppresses proliferation and epithelial-mesenchymal transition in retinal pigment epithelium cells
- 4.The epigenetic modifier trichostatin A, a histone deacetylase inhibitor, suppresses proliferation and epithelial-mesenchymal transition of lens epithelial cells
- 5.The effect of histone deacetylase inhibitor trichostatin A on porcine mesenchymal stem cell transcriptome
- 6.Association of valproate-induced teratogenesis with histone deacetylase inhibition in vivo
6 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
Is trichostatin A a drug?
No. It is a research chemical, not a medicine. It is far too toxic and non-selective for human use and has never been developed as a therapeutic; its value is entirely in the lab.
What is it used for?
As a standard tool to inhibit HDACs in cells and study what happens: changes in gene expression, cell-cycle arrest, reversal of the epithelial-to-mesenchymal transition, and improved reprogramming in cloning and stem-cell work.
Why is it so potent?
Its hydroxamic-acid group reaches into the HDAC enzyme and chelates the zinc ion the enzyme needs to work, shutting down essentially the whole classical HDAC family at very low (nanomolar) concentrations.
Is it safe to handle or take?
It is not safe to take, full stop. It is a hazardous reagent and a known teratogen in animal studies, so it should be handled with lab precautions and never ingested.
Limitations of the evidence
- No human safety data
- Teratogenic in animal studies
Adverse effects
- Broadly disrupts gene regulation and cell division
Notes and cautions
- Hazardous laboratory chemical, not a supplement