Molecular Mechanisms of Alkaloid-Induced Apoptosis in Cancer Cells

Alkaloids represent a structurally diverse class of nitrogen‐containing natural products that have long been investigated as sources of anticancer agents. Among them, bisbenzylisoquinoline alkaloids such as tetrandrine, berbamine and fangchinoline have emerged as potent inducers of programmed cell death in a range of human malignancies. These compounds engage both intrinsic and extrinsic apoptotic pathways by shifting the balance of Bcl-2 family proteins, triggering mitochondrial outer membrane permeabilisation and promoting cytochrome c release. Subsequent assembly of the apoptosome activates initiator caspase-9 and effector caspase-3, culminating in DNA fragmentation and cell dismantling. In parallel, alkaloids often generate reactive oxygen species that amplify endoplasmic reticulum stress and mitogen-activated protein kinase signalling, while also antagonising pro-survival PI3K/Akt and NF-κB cascades. Calcium dysregulation and direct modulation of death receptors further reinforce apoptotic commitment. These multifaceted mechanisms have been exploited to overcome chemoresistance, sensitise tumours to platinum drugs and refine targeted delivery through nanoparticle systems. A detailed understanding of alkaloid-triggered apoptotic networks offers a blueprint for rational drug design and combinatorial regimens aimed at improving clinical outcomes across diverse cancer types.

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Molecular Mechanisms of Alkaloid-Induced Apoptosis in Cancer Cells publication trend

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Technical terms

Apoptosis: A regulated form of cell death characterised by cell shrinkage, chromatin condensation and DNA fragmentation.

Caspase: A family of cysteine proteases that execute apoptosis by cleaving specific cellular substrates.

Bcl-2 family proteins: A group of pro-apoptotic (e.g., Bax, Bak) and anti-apoptotic (e.g., Bcl-2, Bcl-xL) regulators that control mitochondrial integrity.

Mitochondrial outer membrane permeabilisation (MOMP): The process by which mitochondrial proteins such as cytochrome c are released to trigger apoptosome formation.

Reactive oxygen species (ROS): Chemically reactive molecules derived from oxygen that can promote apoptosis by damaging cellular components and activating stress pathways.

References

1. Tetrandrine Induces Mitochondria-Mediated Apoptosis in Human Gastric Cancer BGC-823 Cells. PLOS ONE (2013).
2. Fangchinoline Inhibits Cell Proliferation Via Akt/GSK-3beta/cyclin D1 Signaling and Induces Apoptosis in MDA-MB-231 Breast Cancer Cells. Asian Pacific Journal of Cancer Prevention (2014).
3. Tetrandrine, a Chinese plant-derived alkaloid, is a potential candidate for cancer chemotherapy. Oncotarget (2016).
4. The effect of tetrandrine combined with cisplatin on proliferation and apoptosis of A549/DDP cells and A549 cells. Cancer Cell International (2017).