Garlic compound reduces uterine fibroid cell viability in culture

Aged-garlic compound S-allylcysteine reduced the viability of cells derived from uterine leiomyomas in a laboratory study, with stronger effects than in cells from adjacent, apparently normal myometrium. Researchers exposed primary cultures to 12.5–400 micrograms per milliliter of S-allylcysteine for 48 hours. The measured half-maximal inhibitory concentration, or IC50, was 255.71 ± 17.12 micrograms per milliliter, and the overall reduction in viability was dose-dependent, according to the study.

Uterine leiomyomas, commonly called fibroids, are benign tumors whose behavior is associated with abnormal cell proliferation and altered signaling, including the PI3K/AKT pathway. The experiment involved primary cells collected from 25 women with uterine leiomyoma and paired tumor and adjacent myometrial tissue from 10 of them. The remaining 15 participants provided leiomyoma tissue only. The investigators cultured the cells in DMEM/F12 medium and evaluated the compound with an MTT viability assay, microscopy and RT-qPCR analysis of pathway-related gene expression. Because the work was conducted in primary cell cultures, it does not establish a treatment effect in people or in intact fibroids.

Microscopic examination of S-allylcysteine-treated leiomyoma cultures showed features consistent with apoptosis, including rounded and shrunken cells and reduced cell density or confluency. The myometrial cells exhibited lower sensitivity under the study conditions, indicating a difference in cytotoxicity between tumor-derived and adjacent normal-tissue cells. The paper describes the response as selective, but the evidence comes from a small ex vivo study using one bioactive compound, a fixed 48-hour exposure and cell-based measurements. The results therefore do not show that S-allylcysteine can safely or effectively shrink uterine fibroids in patients.

At the molecular level, S-allylcysteine significantly reduced transcript levels of PIK3R1, the gene used in the study to assess PI3K expression, as well as AKT3 and MTOR. It increased the expression of PTEN. Relative expression was calculated with the ΔΔCt method, using GAPDH as the housekeeping gene, and statistical comparisons used one-way repeated-measures analysis of variance. These changes are directionally consistent with modulation of the PI3K/AKT-related signaling network, but reduced messenger RNA abundance does not by itself demonstrate reduced pathway activity, protein abundance or control of tumor growth. The authors characterized the molecular influence as likely associated with the observed cytotoxic response rather than proving a complete mechanism.

The findings position S-allylcysteine, a bioactive constituent of aged garlic, as a compound worth studying further for possible effects on uterine leiomyoma cells. The work offers both a functional readout—lower viability in tumor-derived cultures—and a set of candidate molecular changes accompanying that response. However, the study’s primary-culture design, limited number of donors, 48-hour treatment period and reliance on in vitro assays constrain translation to clinical use. Additional research would be needed to examine reproducibility, the contribution of individual donors, mechanisms beyond transcript measurements, and effects in living organisms. The paper reports the results as supporting the compound’s potential as a therapeutic agent, but it does not provide evidence of clinical benefit or justify medical recommendations.

Subject of Research: In vitro cytotoxic and gene-expression effects of S-allylcysteine in primary uterine leiomyoma cells

Article Title: Cytotoxic and molecular effects of S-allylcysteine on uterine leiomyoma primary culture cells

Article References: Narwal, S., Vashist, A., Hooda, R., Siwach, K., Kaushik, R., Rohilla, G., Khatri, N., & Vashist, M. (2026). Cytotoxic and molecular effects of S-allylcysteine on uterine leiomyoma primary culture cells. Molecular Biology Reports, 53(1), Article 1520. https://doi.org/10.1007/s11033-026-12708-8

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DOI: 10.1007/s11033-026-12708-8

Keywords: S-allylcysteine, uterine leiomyoma, uterine fibroids, primary cell culture, PI3K/AKT signaling, cytotoxicity, aged garlic, gene expression, myometrial cells, Cytotoxic, molecular, effects