Pseudolaric Acid B Efficacy in Cancer Cell Apoptosis

Pseudolaric acid B (PAB), a diterpenoid isolated from the root bark of Pseudolarix kaempferi, has emerged as a potent inducer of apoptosis across a variety of malignant cell types. Its mechanisms of action encompass both the intrinsic mitochondrial pathway—through modulation of Bcl-2 family proteins, promotion of cytochrome c release and activation of caspase-9 and caspase-3—and the extrinsic death receptor pathway, notably via upregulation of death receptor 5 and subsequent caspase-8 activation. PAB also interferes with microtubule polymerisation, induces G2/M cell-cycle arrest and engages signalling kinases such as c-Jun N-terminal kinase and protein kinase C. In animal models, PAB inhibits tumour growth, reverses multidrug resistance by downregulating P-glycoprotein and COX-2/PKC-α signalling, and often enhances the efficacy of conventional chemotherapeutics. Its favourable toxicity profile and broad spectrum of action underscore its promise as a lead compound for anticancer drug development, with ongoing efforts directed towards optimising delivery systems and structural derivatives to improve selectivity and pharmacokinetics.

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Technical terms

Apoptosis: Programmed cell death involving characteristic morphological and biochemical changes that enable organised removal of damaged or malignant cells.

Caspase: A family of cysteine proteases that execute apoptosis through a proteolytic cascade leading to cellular disassembly.

Bcl-2: An antiapoptotic mitochondrial protein that inhibits cytochrome c release, helping to maintain cell survival.

Bax: A proapoptotic member of the Bcl-2 family that promotes mitochondrial membrane permeabilisation and cytochrome c release.

Death receptor 5: A cell surface receptor that triggers extrinsic apoptotic signalling upon ligand binding, activating caspase-8.

P-glycoprotein: A transmembrane ATP-dependent efflux pump that mediates multidrug resistance by transporting chemotherapeutic agents out of cells.

References

1. Pseudolaric acid B induces apoptosis via activation of c-Jun N-terminal kinase and caspase-3 in HeLa cells. Experimental & Molecular Medicine (2004).
2. A Systematic Review of the Immune-Regulating and Anticancer Activities of Pseudolaric Acid B. Frontiers in Pharmacology (2017).
3. The Inhibitory Effect of Pseudolaric Acid B on Gastric Cancer and Multidrug Resistance via Cox-2/PKC-α/P-gp Pathway. PLOS ONE (2014).
4. Pseudolaric Acid B Induces Growth Inhibition and Caspase-Dependent Apoptosis on Head and Neck Cancer Cell lines through Death Receptor 5. Molecules (2019).