Scientists Discover Plant Compound That Forces Aggressive Breast Cancer Cells Into Self-Destruction
A newly discovered plant-derived molecule disrupts a critical cancer enzyme in an unconventional way.
Scientists looking for new ways to tackle hard-to-treat breast cancers turned to an unexpected source: Munronia henryi, a plant known for producing limonoids, a family of complex natural compounds that plants often use for chemical defense.
In Acta Pharmaceutica Sinica B, the team reports isolating two previously unknown prieurianin-type limonoids from this species. One stood out immediately. They named it DHL-11, and it showed strong activity against triple-negative breast cancer (TNBC), the subtype linked to the worst outcomes and fewest targeted treatment options.
Broad Effects on Cancer Cell Behavior
In cell tests, DHL-11 hit several cancer hallmarks at once. It slowed TNBC cell growth, reduced their ability to migrate, and pushed cells into G2/M arrest before triggering apoptosis. At the same time, treated cells accumulated more reactive oxygen species (ROS) and showed increased DNA damage, a combination that can overwhelm a tumor cell’s ability to survive and repair itself.
The most intriguing part was how DHL-11 achieved these effects. Rather than simply blocking an enzyme’s active site, the compound latched onto a non-catalytic pocket on IMPDH2 and interfered with the partnership between IMPDH2 and FANCI. That disruption set off the breakdown of the IMPDH2 protein itself. With less IMPDH2 available, guanine production dropped, ROS rose further, and DNA damage increased, creating a cascade that helps explain the compound’s multi-pronged impact on TNBC cells.
Validation in Advanced Models
The results also held up in more lifelike models. DHL-11 significantly suppressed the growth of breast cancer patient-derived organoids that had high IMPDH2 expression, an important detail because organoids often preserve features of real tumors that simple cell cultures miss. In animal experiments, the compound reduced both tumor growth and metastasis in TNBC xenografts and did so with favorable biosafety profiles.
The study positions DHL-11 as a promising new kind of targeted therapy candidate: a novel IMPDH2 degrader that could be especially relevant for IMPDH2-positive (TNBC).
Source: SciTechDaily
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Scientists Discover Plant Compound That Forces Aggressive Breast Cancer Cells Into Self-Destruction