Pimaric acid is a naturally occurring resin acid identified in species such as Aralia cordata and various pine trees. Pimaric acid exerts anticancer effects through induction of endoplasmic reticulum stress, activation of caspase-dependent apoptosis, cell cycle arrest, and inhibition of cell migration in ovarian cancer cells. Additionally, pimaric acid suppresses mRNA expression, protein levels, and promoter activity of matrix metalloproteinase-9 (MMP-9) in TNF-α-stimulated human aortic smooth muscle cells (HASMCs), supporting its role in cancer and vascular research.

Pimaric acid significantly inhibited PA-1 cell viability within the concentration range of 0–320 μM after 48 hours of treatment, demonstrating selective cytotoxicity [1][2]. At concentrations of 0–20 μM with the same 48-hour treatment duration, Pimaric acid induced typical morphological changes in PA-1 cells, including shrinkage, membrane blebbing, rounding, and detachment from neighboring cells [1]. Within the 0–20 μM concentration range, it triggered apoptosis through caspase cascade activation in as little as 12 or 24 hours, while exerting antiproliferative effects via endoplasmic reticulum stress and cell cycle arrest [1]. Furthermore, Pimaric acid at 0 and 10 μM concentrations significantly impaired PA-1 cell migration capacity within a 0 to 24-hour time window [1]. For Homo sapiens aortic smooth muscle cells (HASMCs), Pimaric acid at 0–20 μM concentrations blocked TNF-α-induced MMP-9 expression within 26 hours, suppressed TNF-α-mediated NF-κB and AP-1 binding activity, and downregulated MAPK phosphorylation levels [3].