CBD inhibited melanoma by activating a receptor that reprogrammed DNA methylation and turned on a tumor-suppressor gene

What the researchers found

CBD induced apoptosis and inhibited proliferation and invasion of melanoma cells in vitro and reduced lung metastasis in vivo. The mechanism involved CBD activating PPARgamma, which formed a complex with TET1 (a demethylation enzyme). This complex removed methyl groups from the LRSAM1 gene promoter, activating this previously unrecognized anti-cancer gene. LRSAM1 upregulation enhanced melanoma cell death and suppressed proliferation.

Why it matters

Melanoma is the most dangerous form of skin cancer, with limited treatment options for advanced stages. This study identifies a completely new molecular mechanism for CBD's anti-cancer effects and a previously unknown tumor-suppressor gene.

The numbers in context

CBD induced apoptosis, inhibited proliferation and invasion in vitro; reduced pulmonary metastasis in vivo; identified PPARgamma-TET1 complex; LRSAM1 demethylation confirmed by MeDIP; LRSAM1 elevated in treated cells

How the study worked

In vitro studies with melanoma cell lines using MTS, EdU, Transwell invasion, and flow cytometry. In vivo murine lung metastasis model. Network pharmacology and molecular docking for target identification. Integrated transcriptomic and genome-wide methylation analyses. Co-immunoprecipitation and chromatin immunoprecipitation for protein interactions.

What this study cannot tell us

Preclinical study with cell lines and mouse models. CBD concentrations used may not be achievable in humans. LRSAM1's role as a tumor suppressor needs independent confirmation. Melanoma is a heterogeneous cancer and results may not apply to all subtypes.

How to read the evidence

Preliminary: comprehensive preclinical study with multiple validation methods, but no human data and LRSAM1's role is newly proposed.

When this study was published

2026 preclinical publication using melanoma cell lines and murine metastasis model.

The bigger picture

This represents a novel mechanism: CBD working through epigenetic reprogramming rather than direct cytotoxicity. The discovery of LRSAM1 as an anti-cancer gene could have implications beyond CBD, potentially informing other melanoma therapies.

Questions still open

• Would oral CBD at achievable human doses affect melanoma progression? Is LRSAM1 relevant in other cancer types? Could CBD be combined with existing melanoma immunotherapies for synergistic effects?

Common questions

Read the original research

Cannabidiol inhibits melanoma progression by regulating PPARγ-TET1 complex-dependent LRSAM1 demethylation.

Phytomedicine : international journal of phytotherapy and phytopharmacology, 151, 157775

Citation

Zhang, Xuedan; Shen, Baoyu; Li, Enjiang; Yun, Fang; Feng, Yu; Wei, Zhenyan; Niu, Junzi; Huang, Yu; Yu, Song; Kuang, Yingmin; Liu, Haoming; Sai, Buqing; Zhu, Yuechun. (2026). Cannabidiol inhibits melanoma progression by regulating PPARγ-TET1 complex-dependent LRSAM1 demethylation.. Phytomedicine : international journal of phytotherapy and phytopharmacology, 151, 157775. https://doi.org/10.1016/j.phymed.2026.157775

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